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-rw-r--r--kernel/drivers/pwm/Kconfig68
-rw-r--r--kernel/drivers/pwm/Makefile6
-rw-r--r--kernel/drivers/pwm/core.c124
-rw-r--r--kernel/drivers/pwm/pwm-atmel-hlcdc.c9
-rw-r--r--kernel/drivers/pwm/pwm-atmel-tcb.c28
-rw-r--r--kernel/drivers/pwm/pwm-atmel.c67
-rw-r--r--kernel/drivers/pwm/pwm-bcm-kona.c63
-rw-r--r--kernel/drivers/pwm/pwm-berlin.c219
-rw-r--r--kernel/drivers/pwm/pwm-brcmstb.c343
-rw-r--r--kernel/drivers/pwm/pwm-crc.c143
-rw-r--r--kernel/drivers/pwm/pwm-ep93xx.c4
-rw-r--r--kernel/drivers/pwm/pwm-imx.c5
-rw-r--r--kernel/drivers/pwm/pwm-lpc18xx-sct.c465
-rw-r--r--kernel/drivers/pwm/pwm-lpss-pci.c35
-rw-r--r--kernel/drivers/pwm/pwm-lpss-platform.c7
-rw-r--r--kernel/drivers/pwm/pwm-lpss.c62
-rw-r--r--kernel/drivers/pwm/pwm-lpss.h2
-rw-r--r--kernel/drivers/pwm/pwm-mtk-disp.c243
-rw-r--r--kernel/drivers/pwm/pwm-mxs.c4
-rw-r--r--kernel/drivers/pwm/pwm-pca9685.c110
-rw-r--r--kernel/drivers/pwm/pwm-rcar.c274
-rw-r--r--kernel/drivers/pwm/pwm-renesas-tpu.c2
-rw-r--r--kernel/drivers/pwm/pwm-rockchip.c2
-rw-r--r--kernel/drivers/pwm/pwm-samsung.c1
-rw-r--r--kernel/drivers/pwm/pwm-sun4i.c27
-rw-r--r--kernel/drivers/pwm/pwm-tegra.c6
-rw-r--r--kernel/drivers/pwm/pwm-tiecap.c10
-rw-r--r--kernel/drivers/pwm/pwm-tiehrpwm.c6
-rw-r--r--kernel/drivers/pwm/sysfs.c102
29 files changed, 2274 insertions, 163 deletions
diff --git a/kernel/drivers/pwm/Kconfig b/kernel/drivers/pwm/Kconfig
index b1541f40f..2f4641a0e 100644
--- a/kernel/drivers/pwm/Kconfig
+++ b/kernel/drivers/pwm/Kconfig
@@ -92,6 +92,15 @@ config PWM_BCM2835
To compile this driver as a module, choose M here: the module
will be called pwm-bcm2835.
+config PWM_BERLIN
+ tristate "Marvell Berlin PWM support"
+ depends on ARCH_BERLIN
+ help
+ PWM framework driver for Marvell Berlin SoCs.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-berlin.
+
config PWM_BFIN
tristate "Blackfin PWM support"
depends on BFIN_GPTIMERS
@@ -101,6 +110,16 @@ config PWM_BFIN
To compile this driver as a module, choose M here: the module
will be called pwm-bfin.
+config PWM_BRCMSTB
+ tristate "Broadcom STB PWM support"
+ depends on ARCH_BRCMSTB || BMIPS_GENERIC
+ help
+ Generic PWM framework driver for the Broadcom Set-top-Box
+ SoCs (BCM7xxx).
+
+ To compile this driver as a module, choose M Here: the module
+ will be called pwm-brcmstb.c.
+
config PWM_CLPS711X
tristate "CLPS711X PWM support"
depends on ARCH_CLPS711X || COMPILE_TEST
@@ -111,6 +130,13 @@ config PWM_CLPS711X
To compile this driver as a module, choose M here: the module
will be called pwm-clps711x.
+config PWM_CRC
+ bool "Intel Crystalcove (CRC) PWM support"
+ depends on X86 && INTEL_SOC_PMIC
+ help
+ Generic PWM framework driver for Crystalcove (CRC) PMIC based PWM
+ control.
+
config PWM_EP93XX
tristate "Cirrus Logic EP93xx PWM support"
depends on ARCH_EP93XX
@@ -173,6 +199,18 @@ config PWM_LP3943
To compile this driver as a module, choose M here: the module
will be called pwm-lp3943.
+config PWM_LPC18XX_SCT
+ tristate "LPC18xx/43xx PWM/SCT support"
+ depends on ARCH_LPC18XX
+ help
+ Generic PWM framework driver for NXP LPC18xx PWM/SCT which
+ supports 16 channels.
+ A maximum of 15 channels can be requested simultaneously and
+ must have the same period.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-lpc18xx-sct.
+
config PWM_LPC32XX
tristate "LPC32XX PWM support"
depends on ARCH_LPC32XX
@@ -211,6 +249,17 @@ config PWM_LPSS_PLATFORM
To compile this driver as a module, choose M here: the module
will be called pwm-lpss-platform.
+config PWM_MTK_DISP
+ tristate "MediaTek display PWM driver"
+ depends on ARCH_MEDIATEK || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ Generic PWM framework driver for MediaTek disp-pwm device.
+ The PWM is used to control the backlight brightness for display.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-mtk-disp.
+
config PWM_MXS
tristate "Freescale MXS PWM support"
depends on ARCH_MXS && OF
@@ -223,7 +272,7 @@ config PWM_MXS
config PWM_PCA9685
tristate "NXP PCA9685 PWM driver"
- depends on OF && I2C
+ depends on I2C
select REGMAP_I2C
help
Generic PWM framework driver for NXP PCA9685 LED controller.
@@ -249,6 +298,17 @@ config PWM_PXA
To compile this driver as a module, choose M here: the module
will be called pwm-pxa.
+config PWM_RCAR
+ tristate "Renesas R-Car PWM support"
+ depends on ARCH_RCAR_GEN1 || ARCH_RCAR_GEN2 || COMPILE_TEST
+ depends on HAS_IOMEM
+ help
+ This driver exposes the PWM Timer controller found in Renesas
+ R-Car chips through the PWM API.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-rcar.
+
config PWM_RENESAS_TPU
tristate "Renesas TPU PWM support"
depends on ARCH_SHMOBILE || COMPILE_TEST
@@ -319,7 +379,7 @@ config PWM_TEGRA
config PWM_TIECAP
tristate "ECAP PWM support"
- depends on SOC_AM33XX || ARCH_DAVINCI_DA8XX
+ depends on ARCH_OMAP2PLUS || ARCH_DAVINCI_DA8XX
help
PWM driver support for the ECAP APWM controller found on AM33XX
TI SOC
@@ -329,7 +389,7 @@ config PWM_TIECAP
config PWM_TIEHRPWM
tristate "EHRPWM PWM support"
- depends on SOC_AM33XX || ARCH_DAVINCI_DA8XX
+ depends on ARCH_OMAP2PLUS || ARCH_DAVINCI_DA8XX
help
PWM driver support for the EHRPWM controller found on AM33XX
TI SOC
@@ -339,7 +399,7 @@ config PWM_TIEHRPWM
config PWM_TIPWMSS
bool
- default y if SOC_AM33XX && (PWM_TIECAP || PWM_TIEHRPWM)
+ default y if (ARCH_OMAP2PLUS) && (PWM_TIECAP || PWM_TIEHRPWM)
help
PWM Subsystem driver support for AM33xx SOC.
diff --git a/kernel/drivers/pwm/Makefile b/kernel/drivers/pwm/Makefile
index ec50eb5b5..69b8275f3 100644
--- a/kernel/drivers/pwm/Makefile
+++ b/kernel/drivers/pwm/Makefile
@@ -6,22 +6,28 @@ obj-$(CONFIG_PWM_ATMEL_HLCDC_PWM) += pwm-atmel-hlcdc.o
obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o
obj-$(CONFIG_PWM_BCM_KONA) += pwm-bcm-kona.o
obj-$(CONFIG_PWM_BCM2835) += pwm-bcm2835.o
+obj-$(CONFIG_PWM_BERLIN) += pwm-berlin.o
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
+obj-$(CONFIG_PWM_BRCMSTB) += pwm-brcmstb.o
obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
+obj-$(CONFIG_PWM_CRC) += pwm-crc.o
obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
obj-$(CONFIG_PWM_IMG) += pwm-img.o
obj-$(CONFIG_PWM_IMX) += pwm-imx.o
obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o
obj-$(CONFIG_PWM_LP3943) += pwm-lp3943.o
+obj-$(CONFIG_PWM_LPC18XX_SCT) += pwm-lpc18xx-sct.o
obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
obj-$(CONFIG_PWM_LPSS) += pwm-lpss.o
obj-$(CONFIG_PWM_LPSS_PCI) += pwm-lpss-pci.o
obj-$(CONFIG_PWM_LPSS_PLATFORM) += pwm-lpss-platform.o
+obj-$(CONFIG_PWM_MTK_DISP) += pwm-mtk-disp.o
obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o
obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
+obj-$(CONFIG_PWM_RCAR) += pwm-rcar.o
obj-$(CONFIG_PWM_RENESAS_TPU) += pwm-renesas-tpu.o
obj-$(CONFIG_PWM_ROCKCHIP) += pwm-rockchip.o
obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
diff --git a/kernel/drivers/pwm/core.c b/kernel/drivers/pwm/core.c
index ba34c7d89..d24ca5f28 100644
--- a/kernel/drivers/pwm/core.c
+++ b/kernel/drivers/pwm/core.c
@@ -200,6 +200,8 @@ static void of_pwmchip_remove(struct pwm_chip *chip)
* pwm_set_chip_data() - set private chip data for a PWM
* @pwm: PWM device
* @data: pointer to chip-specific data
+ *
+ * Returns: 0 on success or a negative error code on failure.
*/
int pwm_set_chip_data(struct pwm_device *pwm, void *data)
{
@@ -215,6 +217,8 @@ EXPORT_SYMBOL_GPL(pwm_set_chip_data);
/**
* pwm_get_chip_data() - get private chip data for a PWM
* @pwm: PWM device
+ *
+ * Returns: A pointer to the chip-private data for the PWM device.
*/
void *pwm_get_chip_data(struct pwm_device *pwm)
{
@@ -223,13 +227,18 @@ void *pwm_get_chip_data(struct pwm_device *pwm)
EXPORT_SYMBOL_GPL(pwm_get_chip_data);
/**
- * pwmchip_add() - register a new PWM chip
+ * pwmchip_add_with_polarity() - register a new PWM chip
* @chip: the PWM chip to add
+ * @polarity: initial polarity of PWM channels
*
* Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
- * will be used.
+ * will be used. The initial polarity for all channels is specified by the
+ * @polarity parameter.
+ *
+ * Returns: 0 on success or a negative error code on failure.
*/
-int pwmchip_add(struct pwm_chip *chip)
+int pwmchip_add_with_polarity(struct pwm_chip *chip,
+ enum pwm_polarity polarity)
{
struct pwm_device *pwm;
unsigned int i;
@@ -259,6 +268,8 @@ int pwmchip_add(struct pwm_chip *chip)
pwm->chip = chip;
pwm->pwm = chip->base + i;
pwm->hwpwm = i;
+ pwm->polarity = polarity;
+ mutex_init(&pwm->lock);
radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
}
@@ -279,6 +290,21 @@ out:
mutex_unlock(&pwm_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity);
+
+/**
+ * pwmchip_add() - register a new PWM chip
+ * @chip: the PWM chip to add
+ *
+ * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
+ * will be used. The initial polarity for all channels is normal.
+ *
+ * Returns: 0 on success or a negative error code on failure.
+ */
+int pwmchip_add(struct pwm_chip *chip)
+{
+ return pwmchip_add_with_polarity(chip, PWM_POLARITY_NORMAL);
+}
EXPORT_SYMBOL_GPL(pwmchip_add);
/**
@@ -287,6 +313,8 @@ EXPORT_SYMBOL_GPL(pwmchip_add);
*
* Removes a PWM chip. This function may return busy if the PWM chip provides
* a PWM device that is still requested.
+ *
+ * Returns: 0 on success or a negative error code on failure.
*/
int pwmchip_remove(struct pwm_chip *chip)
{
@@ -321,10 +349,13 @@ EXPORT_SYMBOL_GPL(pwmchip_remove);
/**
* pwm_request() - request a PWM device
- * @pwm_id: global PWM device index
+ * @pwm: global PWM device index
* @label: PWM device label
*
* This function is deprecated, use pwm_get() instead.
+ *
+ * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on
+ * failure.
*/
struct pwm_device *pwm_request(int pwm, const char *label)
{
@@ -359,9 +390,9 @@ EXPORT_SYMBOL_GPL(pwm_request);
* @index: per-chip index of the PWM to request
* @label: a literal description string of this PWM
*
- * Returns the PWM at the given index of the given PWM chip. A negative error
- * code is returned if the index is not valid for the specified PWM chip or
- * if the PWM device cannot be requested.
+ * Returns: A pointer to the PWM device at the given index of the given PWM
+ * chip. A negative error code is returned if the index is not valid for the
+ * specified PWM chip or if the PWM device cannot be requested.
*/
struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip,
unsigned int index,
@@ -402,6 +433,8 @@ EXPORT_SYMBOL_GPL(pwm_free);
* @pwm: PWM device
* @duty_ns: "on" time (in nanoseconds)
* @period_ns: duration (in nanoseconds) of one cycle
+ *
+ * Returns: 0 on success or a negative error code on failure.
*/
int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
{
@@ -426,7 +459,10 @@ EXPORT_SYMBOL_GPL(pwm_config);
* @pwm: PWM device
* @polarity: new polarity of the PWM signal
*
- * Note that the polarity cannot be configured while the PWM device is enabled
+ * Note that the polarity cannot be configured while the PWM device is
+ * enabled.
+ *
+ * Returns: 0 on success or a negative error code on failure.
*/
int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
{
@@ -438,29 +474,49 @@ int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
if (!pwm->chip->ops->set_polarity)
return -ENOSYS;
- if (test_bit(PWMF_ENABLED, &pwm->flags))
- return -EBUSY;
+ mutex_lock(&pwm->lock);
+
+ if (pwm_is_enabled(pwm)) {
+ err = -EBUSY;
+ goto unlock;
+ }
err = pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
if (err)
- return err;
+ goto unlock;
pwm->polarity = polarity;
- return 0;
+unlock:
+ mutex_unlock(&pwm->lock);
+ return err;
}
EXPORT_SYMBOL_GPL(pwm_set_polarity);
/**
* pwm_enable() - start a PWM output toggling
* @pwm: PWM device
+ *
+ * Returns: 0 on success or a negative error code on failure.
*/
int pwm_enable(struct pwm_device *pwm)
{
- if (pwm && !test_and_set_bit(PWMF_ENABLED, &pwm->flags))
- return pwm->chip->ops->enable(pwm->chip, pwm);
+ int err = 0;
- return pwm ? 0 : -EINVAL;
+ if (!pwm)
+ return -EINVAL;
+
+ mutex_lock(&pwm->lock);
+
+ if (!test_and_set_bit(PWMF_ENABLED, &pwm->flags)) {
+ err = pwm->chip->ops->enable(pwm->chip, pwm);
+ if (err)
+ clear_bit(PWMF_ENABLED, &pwm->flags);
+ }
+
+ mutex_unlock(&pwm->lock);
+
+ return err;
}
EXPORT_SYMBOL_GPL(pwm_enable);
@@ -507,6 +563,9 @@ static struct pwm_chip *of_node_to_pwmchip(struct device_node *np)
* lookup of the PWM index. This also means that the "pwm-names" property
* becomes mandatory for devices that look up the PWM device via the con_id
* parameter.
+ *
+ * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
+ * error code on failure.
*/
struct pwm_device *of_pwm_get(struct device_node *np, const char *con_id)
{
@@ -586,6 +645,23 @@ void pwm_add_table(struct pwm_lookup *table, size_t num)
}
/**
+ * pwm_remove_table() - unregister PWM device consumers
+ * @table: array of consumers to unregister
+ * @num: number of consumers in table
+ */
+void pwm_remove_table(struct pwm_lookup *table, size_t num)
+{
+ mutex_lock(&pwm_lookup_lock);
+
+ while (num--) {
+ list_del(&table->list);
+ table++;
+ }
+
+ mutex_unlock(&pwm_lookup_lock);
+}
+
+/**
* pwm_get() - look up and request a PWM device
* @dev: device for PWM consumer
* @con_id: consumer name
@@ -596,6 +672,9 @@ void pwm_add_table(struct pwm_lookup *table, size_t num)
*
* Once a PWM chip has been found the specified PWM device will be requested
* and is ready to be used.
+ *
+ * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
+ * error code on failure.
*/
struct pwm_device *pwm_get(struct device *dev, const char *con_id)
{
@@ -659,8 +738,10 @@ struct pwm_device *pwm_get(struct device *dev, const char *con_id)
}
}
- if (!chosen)
+ if (!chosen) {
+ pwm = ERR_PTR(-ENODEV);
goto out;
+ }
chip = pwmchip_find_by_name(chosen->provider);
if (!chip)
@@ -718,6 +799,9 @@ static void devm_pwm_release(struct device *dev, void *res)
*
* This function performs like pwm_get() but the acquired PWM device will
* automatically be released on driver detach.
+ *
+ * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
+ * error code on failure.
*/
struct pwm_device *devm_pwm_get(struct device *dev, const char *con_id)
{
@@ -747,6 +831,9 @@ EXPORT_SYMBOL_GPL(devm_pwm_get);
*
* This function performs like of_pwm_get() but the acquired PWM device will
* automatically be released on driver detach.
+ *
+ * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
+ * error code on failure.
*/
struct pwm_device *devm_of_pwm_get(struct device *dev, struct device_node *np,
const char *con_id)
@@ -798,7 +885,7 @@ EXPORT_SYMBOL_GPL(devm_pwm_put);
* pwm_can_sleep() - report whether PWM access will sleep
* @pwm: PWM device
*
- * It returns true if accessing the PWM can sleep, false otherwise.
+ * Returns: True if accessing the PWM can sleep, false otherwise.
*/
bool pwm_can_sleep(struct pwm_device *pwm)
{
@@ -819,7 +906,7 @@ static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
if (test_bit(PWMF_REQUESTED, &pwm->flags))
seq_puts(s, " requested");
- if (test_bit(PWMF_ENABLED, &pwm->flags))
+ if (pwm_is_enabled(pwm))
seq_puts(s, " enabled");
seq_puts(s, "\n");
@@ -890,6 +977,5 @@ static int __init pwm_debugfs_init(void)
return 0;
}
-
subsys_initcall(pwm_debugfs_init);
#endif /* CONFIG_DEBUG_FS */
diff --git a/kernel/drivers/pwm/pwm-atmel-hlcdc.c b/kernel/drivers/pwm/pwm-atmel-hlcdc.c
index fa5feaba2..f994c7eaf 100644
--- a/kernel/drivers/pwm/pwm-atmel-hlcdc.c
+++ b/kernel/drivers/pwm/pwm-atmel-hlcdc.c
@@ -218,10 +218,18 @@ static const struct atmel_hlcdc_pwm_errata atmel_hlcdc_pwm_sama5d3_errata = {
static const struct of_device_id atmel_hlcdc_dt_ids[] = {
{
+ .compatible = "atmel,at91sam9n12-hlcdc",
+ /* 9n12 has same errata as 9x5 HLCDC PWM */
+ .data = &atmel_hlcdc_pwm_at91sam9x5_errata,
+ },
+ {
.compatible = "atmel,at91sam9x5-hlcdc",
.data = &atmel_hlcdc_pwm_at91sam9x5_errata,
},
{
+ .compatible = "atmel,sama5d2-hlcdc",
+ },
+ {
.compatible = "atmel,sama5d3-hlcdc",
.data = &atmel_hlcdc_pwm_sama5d3_errata,
},
@@ -231,6 +239,7 @@ static const struct of_device_id atmel_hlcdc_dt_ids[] = {
},
{ /* sentinel */ },
};
+MODULE_DEVICE_TABLE(of, atmel_hlcdc_dt_ids);
static int atmel_hlcdc_pwm_probe(struct platform_device *pdev)
{
diff --git a/kernel/drivers/pwm/pwm-atmel-tcb.c b/kernel/drivers/pwm/pwm-atmel-tcb.c
index d14e0677c..75db585a2 100644
--- a/kernel/drivers/pwm/pwm-atmel-tcb.c
+++ b/kernel/drivers/pwm/pwm-atmel-tcb.c
@@ -305,7 +305,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
*/
if (i == 5) {
i = slowclk;
- rate = 32768;
+ rate = clk_get_rate(tc->slow_clk);
min = div_u64(NSEC_PER_SEC, rate);
max = min << tc->tcb_config->counter_width;
@@ -347,7 +347,7 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
tcbpwm->duty = duty;
/* If the PWM is enabled, call enable to apply the new conf */
- if (test_bit(PWMF_ENABLED, &pwm->flags))
+ if (pwm_is_enabled(pwm))
atmel_tcb_pwm_enable(chip, pwm);
return 0;
@@ -387,9 +387,9 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
if (tcbpwm == NULL) {
- atmel_tc_free(tc);
+ err = -ENOMEM;
dev_err(&pdev->dev, "failed to allocate memory\n");
- return -ENOMEM;
+ goto err_free_tc;
}
tcbpwm->chip.dev = &pdev->dev;
@@ -400,17 +400,27 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
tcbpwm->chip.npwm = NPWM;
tcbpwm->tc = tc;
+ err = clk_prepare_enable(tc->slow_clk);
+ if (err)
+ goto err_free_tc;
+
spin_lock_init(&tcbpwm->lock);
err = pwmchip_add(&tcbpwm->chip);
- if (err < 0) {
- atmel_tc_free(tc);
- return err;
- }
+ if (err < 0)
+ goto err_disable_clk;
platform_set_drvdata(pdev, tcbpwm);
return 0;
+
+err_disable_clk:
+ clk_disable_unprepare(tcbpwm->tc->slow_clk);
+
+err_free_tc:
+ atmel_tc_free(tc);
+
+ return err;
}
static int atmel_tcb_pwm_remove(struct platform_device *pdev)
@@ -418,6 +428,8 @@ static int atmel_tcb_pwm_remove(struct platform_device *pdev)
struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
int err;
+ clk_disable_unprepare(tcbpwm->tc->slow_clk);
+
err = pwmchip_remove(&tcbpwm->chip);
if (err < 0)
return err;
diff --git a/kernel/drivers/pwm/pwm-atmel.c b/kernel/drivers/pwm/pwm-atmel.c
index d3c22de9e..0e4bd4e8e 100644
--- a/kernel/drivers/pwm/pwm-atmel.c
+++ b/kernel/drivers/pwm/pwm-atmel.c
@@ -8,9 +8,11 @@
*/
#include <linux/clk.h>
+#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
@@ -21,6 +23,7 @@
#define PWM_ENA 0x04
#define PWM_DIS 0x08
#define PWM_SR 0x0C
+#define PWM_ISR 0x1C
/* Bit field in SR */
#define PWM_SR_ALL_CH_ON 0x0F
@@ -60,6 +63,9 @@ struct atmel_pwm_chip {
struct clk *clk;
void __iomem *base;
+ unsigned int updated_pwms;
+ struct mutex isr_lock; /* ISR is cleared when read, ensure only one thread does that */
+
void (*config)(struct pwm_chip *chip, struct pwm_device *pwm,
unsigned long dty, unsigned long prd);
};
@@ -108,7 +114,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
u32 val;
int ret;
- if (test_bit(PWMF_ENABLED, &pwm->flags) && (period_ns != pwm->period)) {
+ if (pwm_is_enabled(pwm) && (period_ns != pwm_get_period(pwm))) {
dev_err(chip->dev, "cannot change PWM period while enabled\n");
return -EBUSY;
}
@@ -144,6 +150,10 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
val = (val & ~PWM_CMR_CPRE_MSK) | (pres & PWM_CMR_CPRE_MSK);
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
atmel_pwm->config(chip, pwm, dty, prd);
+ mutex_lock(&atmel_pwm->isr_lock);
+ atmel_pwm->updated_pwms |= atmel_pwm_readl(atmel_pwm, PWM_ISR);
+ atmel_pwm->updated_pwms &= ~(1 << pwm->hwpwm);
+ mutex_unlock(&atmel_pwm->isr_lock);
clk_disable(atmel_pwm->clk);
return ret;
@@ -155,24 +165,25 @@ static void atmel_pwm_config_v1(struct pwm_chip *chip, struct pwm_device *pwm,
struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
unsigned int val;
- if (test_bit(PWMF_ENABLED, &pwm->flags)) {
- /*
- * If the PWM channel is enabled, using the update register,
- * it needs to set bit 10 of CMR to 0
- */
- atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV1_CUPD, dty);
- val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
- val &= ~PWM_CMR_UPD_CDTY;
- atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
- } else {
- /*
- * If the PWM channel is disabled, write value to duty and
- * period registers directly.
- */
- atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV1_CDTY, dty);
- atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV1_CPRD, prd);
- }
+ atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV1_CUPD, dty);
+
+ val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
+ val &= ~PWM_CMR_UPD_CDTY;
+ atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
+
+ /*
+ * If the PWM channel is enabled, only update CDTY by using the update
+ * register, it needs to set bit 10 of CMR to 0
+ */
+ if (pwm_is_enabled(pwm))
+ return;
+ /*
+ * If the PWM channel is disabled, write value to duty and period
+ * registers directly.
+ */
+ atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV1_CDTY, dty);
+ atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV1_CPRD, prd);
}
static void atmel_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -180,7 +191,7 @@ static void atmel_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm,
{
struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
- if (test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (pwm_is_enabled(pwm)) {
/*
* If the PWM channel is enabled, using the duty update register
* to update the value.
@@ -242,7 +253,22 @@ static int atmel_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
static void atmel_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
+ unsigned long timeout = jiffies + 2 * HZ;
+
+ /*
+ * Wait for at least a complete period to have passed before disabling a
+ * channel to be sure that CDTY has been updated
+ */
+ mutex_lock(&atmel_pwm->isr_lock);
+ atmel_pwm->updated_pwms |= atmel_pwm_readl(atmel_pwm, PWM_ISR);
+
+ while (!(atmel_pwm->updated_pwms & (1 << pwm->hwpwm)) &&
+ time_before(jiffies, timeout)) {
+ usleep_range(10, 100);
+ atmel_pwm->updated_pwms |= atmel_pwm_readl(atmel_pwm, PWM_ISR);
+ }
+ mutex_unlock(&atmel_pwm->isr_lock);
atmel_pwm_writel(atmel_pwm, PWM_DIS, 1 << pwm->hwpwm);
clk_disable(atmel_pwm->clk);
@@ -357,6 +383,8 @@ static int atmel_pwm_probe(struct platform_device *pdev)
atmel_pwm->chip.npwm = 4;
atmel_pwm->chip.can_sleep = true;
atmel_pwm->config = data->config;
+ atmel_pwm->updated_pwms = 0;
+ mutex_init(&atmel_pwm->isr_lock);
ret = pwmchip_add(&atmel_pwm->chip);
if (ret < 0) {
@@ -378,6 +406,7 @@ static int atmel_pwm_remove(struct platform_device *pdev)
struct atmel_pwm_chip *atmel_pwm = platform_get_drvdata(pdev);
clk_unprepare(atmel_pwm->clk);
+ mutex_destroy(&atmel_pwm->isr_lock);
return pwmchip_remove(&atmel_pwm->chip);
}
diff --git a/kernel/drivers/pwm/pwm-bcm-kona.c b/kernel/drivers/pwm/pwm-bcm-kona.c
index 02bc04889..c63418322 100644
--- a/kernel/drivers/pwm/pwm-bcm-kona.c
+++ b/kernel/drivers/pwm/pwm-bcm-kona.c
@@ -76,19 +76,36 @@ static inline struct kona_pwmc *to_kona_pwmc(struct pwm_chip *_chip)
return container_of(_chip, struct kona_pwmc, chip);
}
-static void kona_pwmc_apply_settings(struct kona_pwmc *kp, unsigned int chan)
+/*
+ * Clear trigger bit but set smooth bit to maintain old output.
+ */
+static void kona_pwmc_prepare_for_settings(struct kona_pwmc *kp,
+ unsigned int chan)
{
unsigned int value = readl(kp->base + PWM_CONTROL_OFFSET);
- /* Clear trigger bit but set smooth bit to maintain old output */
value |= 1 << PWM_CONTROL_SMOOTH_SHIFT(chan);
value &= ~(1 << PWM_CONTROL_TRIGGER_SHIFT(chan));
writel(value, kp->base + PWM_CONTROL_OFFSET);
+ /*
+ * There must be a min 400ns delay between clearing trigger and setting
+ * it. Failing to do this may result in no PWM signal.
+ */
+ ndelay(400);
+}
+
+static void kona_pwmc_apply_settings(struct kona_pwmc *kp, unsigned int chan)
+{
+ unsigned int value = readl(kp->base + PWM_CONTROL_OFFSET);
+
/* Set trigger bit and clear smooth bit to apply new settings */
value &= ~(1 << PWM_CONTROL_SMOOTH_SHIFT(chan));
value |= 1 << PWM_CONTROL_TRIGGER_SHIFT(chan);
writel(value, kp->base + PWM_CONTROL_OFFSET);
+
+ /* Trigger bit must be held high for at least 400 ns. */
+ ndelay(400);
}
static int kona_pwmc_config(struct pwm_chip *chip, struct pwm_device *pwm,
@@ -133,8 +150,14 @@ static int kona_pwmc_config(struct pwm_chip *chip, struct pwm_device *pwm,
return -EINVAL;
}
- /* If the PWM channel is enabled, write the settings to the HW */
- if (test_bit(PWMF_ENABLED, &pwm->flags)) {
+ /*
+ * Don't apply settings if disabled. The period and duty cycle are
+ * always calculated above to ensure the new values are
+ * validated immediately instead of on enable.
+ */
+ if (pwm_is_enabled(pwm)) {
+ kona_pwmc_prepare_for_settings(kp, chan);
+
value = readl(kp->base + PRESCALE_OFFSET);
value &= ~PRESCALE_MASK(chan);
value |= prescale << PRESCALE_SHIFT(chan);
@@ -164,6 +187,8 @@ static int kona_pwmc_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
return ret;
}
+ kona_pwmc_prepare_for_settings(kp, chan);
+
value = readl(kp->base + PWM_CONTROL_OFFSET);
if (polarity == PWM_POLARITY_NORMAL)
@@ -175,9 +200,6 @@ static int kona_pwmc_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
kona_pwmc_apply_settings(kp, chan);
- /* Wait for waveform to settle before gating off the clock */
- ndelay(400);
-
clk_disable_unprepare(kp->clk);
return 0;
@@ -194,7 +216,8 @@ static int kona_pwmc_enable(struct pwm_chip *chip, struct pwm_device *pwm)
return ret;
}
- ret = kona_pwmc_config(chip, pwm, pwm->duty_cycle, pwm->period);
+ ret = kona_pwmc_config(chip, pwm, pwm_get_duty_cycle(pwm),
+ pwm_get_period(pwm));
if (ret < 0) {
clk_disable_unprepare(kp->clk);
return ret;
@@ -207,13 +230,20 @@ static void kona_pwmc_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct kona_pwmc *kp = to_kona_pwmc(chip);
unsigned int chan = pwm->hwpwm;
+ unsigned int value;
+
+ kona_pwmc_prepare_for_settings(kp, chan);
/* Simulate a disable by configuring for zero duty */
writel(0, kp->base + DUTY_CYCLE_HIGH_OFFSET(chan));
- kona_pwmc_apply_settings(kp, chan);
+ writel(0, kp->base + PERIOD_COUNT_OFFSET(chan));
- /* Wait for waveform to settle before gating off the clock */
- ndelay(400);
+ /* Set prescale to 0 for this channel */
+ value = readl(kp->base + PRESCALE_OFFSET);
+ value &= ~PRESCALE_MASK(chan);
+ writel(value, kp->base + PRESCALE_OFFSET);
+
+ kona_pwmc_apply_settings(kp, chan);
clk_disable_unprepare(kp->clk);
}
@@ -266,18 +296,15 @@ static int kona_pwmc_probe(struct platform_device *pdev)
return ret;
}
- /* Set smooth mode, push/pull, and normal polarity for all channels */
- for (chan = 0; chan < kp->chip.npwm; chan++) {
- value |= (1 << PWM_CONTROL_SMOOTH_SHIFT(chan));
+ /* Set push/pull for all channels */
+ for (chan = 0; chan < kp->chip.npwm; chan++)
value |= (1 << PWM_CONTROL_TYPE_SHIFT(chan));
- value |= (1 << PWM_CONTROL_POLARITY_SHIFT(chan));
- }
writel(value, kp->base + PWM_CONTROL_OFFSET);
clk_disable_unprepare(kp->clk);
- ret = pwmchip_add(&kp->chip);
+ ret = pwmchip_add_with_polarity(&kp->chip, PWM_POLARITY_INVERSED);
if (ret < 0)
dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
@@ -290,7 +317,7 @@ static int kona_pwmc_remove(struct platform_device *pdev)
unsigned int chan;
for (chan = 0; chan < kp->chip.npwm; chan++)
- if (test_bit(PWMF_ENABLED, &kp->chip.pwms[chan].flags))
+ if (pwm_is_enabled(&kp->chip.pwms[chan]))
clk_disable_unprepare(kp->clk);
return pwmchip_remove(&kp->chip);
diff --git a/kernel/drivers/pwm/pwm-berlin.c b/kernel/drivers/pwm/pwm-berlin.c
new file mode 100644
index 000000000..65108129d
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-berlin.c
@@ -0,0 +1,219 @@
+/*
+ * Marvell Berlin PWM driver
+ *
+ * Copyright (C) 2015 Marvell Technology Group Ltd.
+ *
+ * Author: Antoine Tenart <antoine.tenart@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+#define BERLIN_PWM_EN 0x0
+#define BERLIN_PWM_ENABLE BIT(0)
+#define BERLIN_PWM_CONTROL 0x4
+#define BERLIN_PWM_PRESCALE_MASK 0x7
+#define BERLIN_PWM_PRESCALE_MAX 4096
+#define BERLIN_PWM_INVERT_POLARITY BIT(3)
+#define BERLIN_PWM_DUTY 0x8
+#define BERLIN_PWM_TCNT 0xc
+#define BERLIN_PWM_MAX_TCNT 65535
+
+struct berlin_pwm_chip {
+ struct pwm_chip chip;
+ struct clk *clk;
+ void __iomem *base;
+};
+
+static inline struct berlin_pwm_chip *to_berlin_pwm_chip(struct pwm_chip *chip)
+{
+ return container_of(chip, struct berlin_pwm_chip, chip);
+}
+
+static const u32 prescaler_table[] = {
+ 1, 4, 8, 16, 64, 256, 1024, 4096
+};
+
+static inline u32 berlin_pwm_readl(struct berlin_pwm_chip *chip,
+ unsigned int channel, unsigned long offset)
+{
+ return readl_relaxed(chip->base + channel * 0x10 + offset);
+}
+
+static inline void berlin_pwm_writel(struct berlin_pwm_chip *chip,
+ unsigned int channel, u32 value,
+ unsigned long offset)
+{
+ writel_relaxed(value, chip->base + channel * 0x10 + offset);
+}
+
+static int berlin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm_dev,
+ int duty_ns, int period_ns)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ unsigned int prescale;
+ u32 value, duty, period;
+ u64 cycles, tmp;
+
+ cycles = clk_get_rate(pwm->clk);
+ cycles *= period_ns;
+ do_div(cycles, NSEC_PER_SEC);
+
+ for (prescale = 0; prescale < ARRAY_SIZE(prescaler_table); prescale++) {
+ tmp = cycles;
+ do_div(tmp, prescaler_table[prescale]);
+
+ if (tmp <= BERLIN_PWM_MAX_TCNT)
+ break;
+ }
+
+ if (tmp > BERLIN_PWM_MAX_TCNT)
+ return -ERANGE;
+
+ period = tmp;
+ cycles = tmp * duty_ns;
+ do_div(cycles, period_ns);
+ duty = cycles;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL);
+ value &= ~BERLIN_PWM_PRESCALE_MASK;
+ value |= prescale;
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL);
+
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, duty, BERLIN_PWM_DUTY);
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, period, BERLIN_PWM_TCNT);
+
+ return 0;
+}
+
+static int berlin_pwm_set_polarity(struct pwm_chip *chip,
+ struct pwm_device *pwm_dev,
+ enum pwm_polarity polarity)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ u32 value;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_CONTROL);
+
+ if (polarity == PWM_POLARITY_NORMAL)
+ value &= ~BERLIN_PWM_INVERT_POLARITY;
+ else
+ value |= BERLIN_PWM_INVERT_POLARITY;
+
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_CONTROL);
+
+ return 0;
+}
+
+static int berlin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm_dev)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ u32 value;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_EN);
+ value |= BERLIN_PWM_ENABLE;
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_EN);
+
+ return 0;
+}
+
+static void berlin_pwm_disable(struct pwm_chip *chip,
+ struct pwm_device *pwm_dev)
+{
+ struct berlin_pwm_chip *pwm = to_berlin_pwm_chip(chip);
+ u32 value;
+
+ value = berlin_pwm_readl(pwm, pwm_dev->hwpwm, BERLIN_PWM_EN);
+ value &= ~BERLIN_PWM_ENABLE;
+ berlin_pwm_writel(pwm, pwm_dev->hwpwm, value, BERLIN_PWM_EN);
+}
+
+static const struct pwm_ops berlin_pwm_ops = {
+ .config = berlin_pwm_config,
+ .set_polarity = berlin_pwm_set_polarity,
+ .enable = berlin_pwm_enable,
+ .disable = berlin_pwm_disable,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id berlin_pwm_match[] = {
+ { .compatible = "marvell,berlin-pwm" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, berlin_pwm_match);
+
+static int berlin_pwm_probe(struct platform_device *pdev)
+{
+ struct berlin_pwm_chip *pwm;
+ struct resource *res;
+ int ret;
+
+ pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
+ if (!pwm)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pwm->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pwm->base))
+ return PTR_ERR(pwm->base);
+
+ pwm->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pwm->clk))
+ return PTR_ERR(pwm->clk);
+
+ ret = clk_prepare_enable(pwm->clk);
+ if (ret)
+ return ret;
+
+ pwm->chip.dev = &pdev->dev;
+ pwm->chip.ops = &berlin_pwm_ops;
+ pwm->chip.base = -1;
+ pwm->chip.npwm = 4;
+ pwm->chip.can_sleep = true;
+ pwm->chip.of_xlate = of_pwm_xlate_with_flags;
+ pwm->chip.of_pwm_n_cells = 3;
+
+ ret = pwmchip_add(&pwm->chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
+ clk_disable_unprepare(pwm->clk);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, pwm);
+
+ return 0;
+}
+
+static int berlin_pwm_remove(struct platform_device *pdev)
+{
+ struct berlin_pwm_chip *pwm = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = pwmchip_remove(&pwm->chip);
+ clk_disable_unprepare(pwm->clk);
+
+ return ret;
+}
+
+static struct platform_driver berlin_pwm_driver = {
+ .probe = berlin_pwm_probe,
+ .remove = berlin_pwm_remove,
+ .driver = {
+ .name = "berlin-pwm",
+ .of_match_table = berlin_pwm_match,
+ },
+};
+module_platform_driver(berlin_pwm_driver);
+
+MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
+MODULE_DESCRIPTION("Marvell Berlin PWM driver");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/pwm/pwm-brcmstb.c b/kernel/drivers/pwm/pwm-brcmstb.c
new file mode 100644
index 000000000..423ce087c
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-brcmstb.c
@@ -0,0 +1,343 @@
+/*
+ * Broadcom BCM7038 PWM driver
+ * Author: Florian Fainelli
+ *
+ * Copyright (C) 2015 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/clk.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/spinlock.h>
+
+#define PWM_CTRL 0x00
+#define CTRL_START BIT(0)
+#define CTRL_OEB BIT(1)
+#define CTRL_FORCE_HIGH BIT(2)
+#define CTRL_OPENDRAIN BIT(3)
+#define CTRL_CHAN_OFFS 4
+
+#define PWM_CTRL2 0x04
+#define CTRL2_OUT_SELECT BIT(0)
+
+#define PWM_CH_SIZE 0x8
+
+#define PWM_CWORD_MSB(ch) (0x08 + ((ch) * PWM_CH_SIZE))
+#define PWM_CWORD_LSB(ch) (0x0c + ((ch) * PWM_CH_SIZE))
+
+/* Number of bits for the CWORD value */
+#define CWORD_BIT_SIZE 16
+
+/*
+ * Maximum control word value allowed when variable-frequency PWM is used as a
+ * clock for the constant-frequency PMW.
+ */
+#define CONST_VAR_F_MAX 32768
+#define CONST_VAR_F_MIN 1
+
+#define PWM_ON(ch) (0x18 + ((ch) * PWM_CH_SIZE))
+#define PWM_ON_MIN 1
+#define PWM_PERIOD(ch) (0x1c + ((ch) * PWM_CH_SIZE))
+#define PWM_PERIOD_MIN 0
+
+#define PWM_ON_PERIOD_MAX 0xff
+
+struct brcmstb_pwm {
+ void __iomem *base;
+ spinlock_t lock;
+ struct clk *clk;
+ struct pwm_chip chip;
+};
+
+static inline u32 brcmstb_pwm_readl(struct brcmstb_pwm *p,
+ unsigned int offset)
+{
+ if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+ return __raw_readl(p->base + offset);
+ else
+ return readl_relaxed(p->base + offset);
+}
+
+static inline void brcmstb_pwm_writel(struct brcmstb_pwm *p, u32 value,
+ unsigned int offset)
+{
+ if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
+ __raw_writel(value, p->base + offset);
+ else
+ writel_relaxed(value, p->base + offset);
+}
+
+static inline struct brcmstb_pwm *to_brcmstb_pwm(struct pwm_chip *chip)
+{
+ return container_of(chip, struct brcmstb_pwm, chip);
+}
+
+/*
+ * Fv is derived from the variable frequency output. The variable frequency
+ * output is configured using this formula:
+ *
+ * W = cword, if cword < 2 ^ 15 else 16-bit 2's complement of cword
+ *
+ * Fv = W x 2 ^ -16 x 27Mhz (reference clock)
+ *
+ * The period is: (period + 1) / Fv and "on" time is on / (period + 1)
+ *
+ * The PWM core framework specifies that the "duty_ns" parameter is in fact the
+ * "on" time, so this translates directly into our HW programming here.
+ */
+static int brcmstb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct brcmstb_pwm *p = to_brcmstb_pwm(chip);
+ unsigned long pc, dc, cword = CONST_VAR_F_MAX;
+ unsigned int channel = pwm->hwpwm;
+ u32 value;
+
+ /*
+ * If asking for a duty_ns equal to period_ns, we need to substract
+ * the period value by 1 to make it shorter than the "on" time and
+ * produce a flat 100% duty cycle signal, and max out the "on" time
+ */
+ if (duty_ns == period_ns) {
+ dc = PWM_ON_PERIOD_MAX;
+ pc = PWM_ON_PERIOD_MAX - 1;
+ goto done;
+ }
+
+ while (1) {
+ u64 rate, tmp;
+
+ /*
+ * Calculate the base rate from base frequency and current
+ * cword
+ */
+ rate = (u64)clk_get_rate(p->clk) * (u64)cword;
+ do_div(rate, 1 << CWORD_BIT_SIZE);
+
+ tmp = period_ns * rate;
+ do_div(tmp, NSEC_PER_SEC);
+ pc = tmp;
+
+ tmp = (duty_ns + 1) * rate;
+ do_div(tmp, NSEC_PER_SEC);
+ dc = tmp;
+
+ /*
+ * We can be called with separate duty and period updates,
+ * so do not reject dc == 0 right away
+ */
+ if (pc == PWM_PERIOD_MIN || (dc < PWM_ON_MIN && duty_ns))
+ return -EINVAL;
+
+ /* We converged on a calculation */
+ if (pc <= PWM_ON_PERIOD_MAX && dc <= PWM_ON_PERIOD_MAX)
+ break;
+
+ /*
+ * The cword needs to be a power of 2 for the variable
+ * frequency generator to output a 50% duty cycle variable
+ * frequency which is used as input clock to the fixed
+ * frequency generator.
+ */
+ cword >>= 1;
+
+ /*
+ * Desired periods are too large, we do not have a divider
+ * for them
+ */
+ if (cword < CONST_VAR_F_MIN)
+ return -EINVAL;
+ }
+
+done:
+ /*
+ * Configure the defined "cword" value to have the variable frequency
+ * generator output a base frequency for the constant frequency
+ * generator to derive from.
+ */
+ spin_lock(&p->lock);
+ brcmstb_pwm_writel(p, cword >> 8, PWM_CWORD_MSB(channel));
+ brcmstb_pwm_writel(p, cword & 0xff, PWM_CWORD_LSB(channel));
+
+ /* Select constant frequency signal output */
+ value = brcmstb_pwm_readl(p, PWM_CTRL2);
+ value |= CTRL2_OUT_SELECT << (channel * CTRL_CHAN_OFFS);
+ brcmstb_pwm_writel(p, value, PWM_CTRL2);
+
+ /* Configure on and period value */
+ brcmstb_pwm_writel(p, pc, PWM_PERIOD(channel));
+ brcmstb_pwm_writel(p, dc, PWM_ON(channel));
+ spin_unlock(&p->lock);
+
+ return 0;
+}
+
+static inline void brcmstb_pwm_enable_set(struct brcmstb_pwm *p,
+ unsigned int channel, bool enable)
+{
+ unsigned int shift = channel * CTRL_CHAN_OFFS;
+ u32 value;
+
+ spin_lock(&p->lock);
+ value = brcmstb_pwm_readl(p, PWM_CTRL);
+
+ if (enable) {
+ value &= ~(CTRL_OEB << shift);
+ value |= (CTRL_START | CTRL_OPENDRAIN) << shift;
+ } else {
+ value &= ~((CTRL_START | CTRL_OPENDRAIN) << shift);
+ value |= CTRL_OEB << shift;
+ }
+
+ brcmstb_pwm_writel(p, value, PWM_CTRL);
+ spin_unlock(&p->lock);
+}
+
+static int brcmstb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct brcmstb_pwm *p = to_brcmstb_pwm(chip);
+
+ brcmstb_pwm_enable_set(p, pwm->hwpwm, true);
+
+ return 0;
+}
+
+static void brcmstb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct brcmstb_pwm *p = to_brcmstb_pwm(chip);
+
+ brcmstb_pwm_enable_set(p, pwm->hwpwm, false);
+}
+
+static const struct pwm_ops brcmstb_pwm_ops = {
+ .config = brcmstb_pwm_config,
+ .enable = brcmstb_pwm_enable,
+ .disable = brcmstb_pwm_disable,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id brcmstb_pwm_of_match[] = {
+ { .compatible = "brcm,bcm7038-pwm", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, brcmstb_pwm_of_match);
+
+static int brcmstb_pwm_probe(struct platform_device *pdev)
+{
+ struct brcmstb_pwm *p;
+ struct resource *res;
+ int ret;
+
+ p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ spin_lock_init(&p->lock);
+
+ p->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(p->clk)) {
+ dev_err(&pdev->dev, "failed to obtain clock\n");
+ return PTR_ERR(p->clk);
+ }
+
+ ret = clk_prepare_enable(p->clk);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, p);
+
+ p->chip.dev = &pdev->dev;
+ p->chip.ops = &brcmstb_pwm_ops;
+ p->chip.base = -1;
+ p->chip.npwm = 2;
+ p->chip.can_sleep = true;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ p->base = devm_ioremap_resource(&pdev->dev, res);
+ if (!p->base) {
+ ret = -ENOMEM;
+ goto out_clk;
+ }
+
+ ret = pwmchip_add(&p->chip);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
+ goto out_clk;
+ }
+
+ return 0;
+
+out_clk:
+ clk_disable_unprepare(p->clk);
+ return ret;
+}
+
+static int brcmstb_pwm_remove(struct platform_device *pdev)
+{
+ struct brcmstb_pwm *p = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = pwmchip_remove(&p->chip);
+ clk_disable_unprepare(p->clk);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int brcmstb_pwm_suspend(struct device *dev)
+{
+ struct brcmstb_pwm *p = dev_get_drvdata(dev);
+
+ clk_disable(p->clk);
+
+ return 0;
+}
+
+static int brcmstb_pwm_resume(struct device *dev)
+{
+ struct brcmstb_pwm *p = dev_get_drvdata(dev);
+
+ clk_enable(p->clk);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(brcmstb_pwm_pm_ops, brcmstb_pwm_suspend,
+ brcmstb_pwm_resume);
+
+static struct platform_driver brcmstb_pwm_driver = {
+ .probe = brcmstb_pwm_probe,
+ .remove = brcmstb_pwm_remove,
+ .driver = {
+ .name = "pwm-brcmstb",
+ .of_match_table = brcmstb_pwm_of_match,
+ .pm = &brcmstb_pwm_pm_ops,
+ },
+};
+module_platform_driver(brcmstb_pwm_driver);
+
+MODULE_AUTHOR("Florian Fainelli <f.fainelli@gmail.com>");
+MODULE_DESCRIPTION("Broadcom STB PWM driver");
+MODULE_ALIAS("platform:pwm-brcmstb");
+MODULE_LICENSE("GPL");
diff --git a/kernel/drivers/pwm/pwm-crc.c b/kernel/drivers/pwm/pwm-crc.c
new file mode 100644
index 000000000..7101c7020
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-crc.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2015 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Author: Shobhit Kumar <shobhit.kumar@intel.com>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/pwm.h>
+
+#define PWM0_CLK_DIV 0x4B
+#define PWM_OUTPUT_ENABLE BIT(7)
+#define PWM_DIV_CLK_0 0x00 /* DIVIDECLK = BASECLK */
+#define PWM_DIV_CLK_100 0x63 /* DIVIDECLK = BASECLK/100 */
+#define PWM_DIV_CLK_128 0x7F /* DIVIDECLK = BASECLK/128 */
+
+#define PWM0_DUTY_CYCLE 0x4E
+#define BACKLIGHT_EN 0x51
+
+#define PWM_MAX_LEVEL 0xFF
+
+#define PWM_BASE_CLK 6000000 /* 6 MHz */
+#define PWM_MAX_PERIOD_NS 21333 /* 46.875KHz */
+
+/**
+ * struct crystalcove_pwm - Crystal Cove PWM controller
+ * @chip: the abstract pwm_chip structure.
+ * @regmap: the regmap from the parent device.
+ */
+struct crystalcove_pwm {
+ struct pwm_chip chip;
+ struct regmap *regmap;
+};
+
+static inline struct crystalcove_pwm *to_crc_pwm(struct pwm_chip *pc)
+{
+ return container_of(pc, struct crystalcove_pwm, chip);
+}
+
+static int crc_pwm_enable(struct pwm_chip *c, struct pwm_device *pwm)
+{
+ struct crystalcove_pwm *crc_pwm = to_crc_pwm(c);
+
+ regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 1);
+
+ return 0;
+}
+
+static void crc_pwm_disable(struct pwm_chip *c, struct pwm_device *pwm)
+{
+ struct crystalcove_pwm *crc_pwm = to_crc_pwm(c);
+
+ regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 0);
+}
+
+static int crc_pwm_config(struct pwm_chip *c, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct crystalcove_pwm *crc_pwm = to_crc_pwm(c);
+ struct device *dev = crc_pwm->chip.dev;
+ int level;
+
+ if (period_ns > PWM_MAX_PERIOD_NS) {
+ dev_err(dev, "un-supported period_ns\n");
+ return -EINVAL;
+ }
+
+ if (pwm->period != period_ns) {
+ int clk_div;
+
+ /* changing the clk divisor, need to disable fisrt */
+ crc_pwm_disable(c, pwm);
+ clk_div = PWM_BASE_CLK * period_ns / NSEC_PER_SEC;
+
+ regmap_write(crc_pwm->regmap, PWM0_CLK_DIV,
+ clk_div | PWM_OUTPUT_ENABLE);
+
+ /* enable back */
+ crc_pwm_enable(c, pwm);
+ }
+
+ /* change the pwm duty cycle */
+ level = duty_ns * PWM_MAX_LEVEL / period_ns;
+ regmap_write(crc_pwm->regmap, PWM0_DUTY_CYCLE, level);
+
+ return 0;
+}
+
+static const struct pwm_ops crc_pwm_ops = {
+ .config = crc_pwm_config,
+ .enable = crc_pwm_enable,
+ .disable = crc_pwm_disable,
+};
+
+static int crystalcove_pwm_probe(struct platform_device *pdev)
+{
+ struct crystalcove_pwm *pwm;
+ struct device *dev = pdev->dev.parent;
+ struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
+
+ pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
+ if (!pwm)
+ return -ENOMEM;
+
+ pwm->chip.dev = &pdev->dev;
+ pwm->chip.ops = &crc_pwm_ops;
+ pwm->chip.base = -1;
+ pwm->chip.npwm = 1;
+
+ /* get the PMIC regmap */
+ pwm->regmap = pmic->regmap;
+
+ platform_set_drvdata(pdev, pwm);
+
+ return pwmchip_add(&pwm->chip);
+}
+
+static int crystalcove_pwm_remove(struct platform_device *pdev)
+{
+ struct crystalcove_pwm *pwm = platform_get_drvdata(pdev);
+
+ return pwmchip_remove(&pwm->chip);
+}
+
+static struct platform_driver crystalcove_pwm_driver = {
+ .probe = crystalcove_pwm_probe,
+ .remove = crystalcove_pwm_remove,
+ .driver = {
+ .name = "crystal_cove_pwm",
+ },
+};
+
+builtin_platform_driver(crystalcove_pwm_driver);
diff --git a/kernel/drivers/pwm/pwm-ep93xx.c b/kernel/drivers/pwm/pwm-ep93xx.c
index e593e9c45..bbf10ae02 100644
--- a/kernel/drivers/pwm/pwm-ep93xx.c
+++ b/kernel/drivers/pwm/pwm-ep93xx.c
@@ -82,7 +82,7 @@ static int ep93xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
* The clock needs to be enabled to access the PWM registers.
* Configuration can be changed at any time.
*/
- if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (!pwm_is_enabled(pwm)) {
ret = clk_enable(ep93xx_pwm->clk);
if (ret)
return ret;
@@ -113,7 +113,7 @@ static int ep93xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
ret = -EINVAL;
}
- if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ if (!pwm_is_enabled(pwm))
clk_disable(ep93xx_pwm->clk);
return ret;
diff --git a/kernel/drivers/pwm/pwm-imx.c b/kernel/drivers/pwm/pwm-imx.c
index 66d6f0c5c..d600fd5cd 100644
--- a/kernel/drivers/pwm/pwm-imx.c
+++ b/kernel/drivers/pwm/pwm-imx.c
@@ -114,7 +114,7 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
unsigned long long c;
unsigned long period_cycles, duty_cycles, prescale;
unsigned int period_ms;
- bool enable = test_bit(PWMF_ENABLED, &pwm->flags);
+ bool enable = pwm_is_enabled(pwm);
int wait_count = 0, fifoav;
u32 cr, sr;
@@ -129,7 +129,8 @@ static int imx_pwm_config_v2(struct pwm_chip *chip,
sr = readl(imx->mmio_base + MX3_PWMSR);
fifoav = sr & MX3_PWMSR_FIFOAV_MASK;
if (fifoav == MX3_PWMSR_FIFOAV_4WORDS) {
- period_ms = DIV_ROUND_UP(pwm->period, NSEC_PER_MSEC);
+ period_ms = DIV_ROUND_UP(pwm_get_period(pwm),
+ NSEC_PER_MSEC);
msleep(period_ms);
sr = readl(imx->mmio_base + MX3_PWMSR);
diff --git a/kernel/drivers/pwm/pwm-lpc18xx-sct.c b/kernel/drivers/pwm/pwm-lpc18xx-sct.c
new file mode 100644
index 000000000..916308510
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-lpc18xx-sct.c
@@ -0,0 +1,465 @@
+/*
+ * NXP LPC18xx State Configurable Timer - Pulse Width Modulator driver
+ *
+ * Copyright (c) 2015 Ariel D'Alessandro <ariel@vanguardiasur.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License.
+ *
+ * Notes
+ * =====
+ * NXP LPC18xx provides a State Configurable Timer (SCT) which can be configured
+ * as a Pulse Width Modulator.
+ *
+ * SCT supports 16 outputs, 16 events and 16 registers. Each event will be
+ * triggered when its related register matches the SCT counter value, and it
+ * will set or clear a selected output.
+ *
+ * One of the events is preselected to generate the period, thus the maximum
+ * number of simultaneous channels is limited to 15. Notice that period is
+ * global to all the channels, thus PWM driver will refuse setting different
+ * values to it, unless there's only one channel requested.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+/* LPC18xx SCT registers */
+#define LPC18XX_PWM_CONFIG 0x000
+#define LPC18XX_PWM_CONFIG_UNIFY BIT(0)
+#define LPC18XX_PWM_CONFIG_NORELOAD BIT(7)
+
+#define LPC18XX_PWM_CTRL 0x004
+#define LPC18XX_PWM_CTRL_HALT BIT(2)
+#define LPC18XX_PWM_BIDIR BIT(4)
+#define LPC18XX_PWM_PRE_SHIFT 5
+#define LPC18XX_PWM_PRE_MASK (0xff << LPC18XX_PWM_PRE_SHIFT)
+#define LPC18XX_PWM_PRE(x) (x << LPC18XX_PWM_PRE_SHIFT)
+
+#define LPC18XX_PWM_LIMIT 0x008
+
+#define LPC18XX_PWM_RES_BASE 0x058
+#define LPC18XX_PWM_RES_SHIFT(_ch) (_ch * 2)
+#define LPC18XX_PWM_RES(_ch, _action) (_action << LPC18XX_PWM_RES_SHIFT(_ch))
+#define LPC18XX_PWM_RES_MASK(_ch) (0x3 << LPC18XX_PWM_RES_SHIFT(_ch))
+
+#define LPC18XX_PWM_MATCH_BASE 0x100
+#define LPC18XX_PWM_MATCH(_ch) (LPC18XX_PWM_MATCH_BASE + _ch * 4)
+
+#define LPC18XX_PWM_MATCHREL_BASE 0x200
+#define LPC18XX_PWM_MATCHREL(_ch) (LPC18XX_PWM_MATCHREL_BASE + _ch * 4)
+
+#define LPC18XX_PWM_EVSTATEMSK_BASE 0x300
+#define LPC18XX_PWM_EVSTATEMSK(_ch) (LPC18XX_PWM_EVSTATEMSK_BASE + _ch * 8)
+#define LPC18XX_PWM_EVSTATEMSK_ALL 0xffffffff
+
+#define LPC18XX_PWM_EVCTRL_BASE 0x304
+#define LPC18XX_PWM_EVCTRL(_ev) (LPC18XX_PWM_EVCTRL_BASE + _ev * 8)
+
+#define LPC18XX_PWM_EVCTRL_MATCH(_ch) _ch
+
+#define LPC18XX_PWM_EVCTRL_COMB_SHIFT 12
+#define LPC18XX_PWM_EVCTRL_COMB_MATCH (0x1 << LPC18XX_PWM_EVCTRL_COMB_SHIFT)
+
+#define LPC18XX_PWM_OUTPUTSET_BASE 0x500
+#define LPC18XX_PWM_OUTPUTSET(_ch) (LPC18XX_PWM_OUTPUTSET_BASE + _ch * 8)
+
+#define LPC18XX_PWM_OUTPUTCL_BASE 0x504
+#define LPC18XX_PWM_OUTPUTCL(_ch) (LPC18XX_PWM_OUTPUTCL_BASE + _ch * 8)
+
+/* LPC18xx SCT unified counter */
+#define LPC18XX_PWM_TIMER_MAX 0xffffffff
+
+/* LPC18xx SCT events */
+#define LPC18XX_PWM_EVENT_PERIOD 0
+#define LPC18XX_PWM_EVENT_MAX 16
+
+/* SCT conflict resolution */
+enum lpc18xx_pwm_res_action {
+ LPC18XX_PWM_RES_NONE,
+ LPC18XX_PWM_RES_SET,
+ LPC18XX_PWM_RES_CLEAR,
+ LPC18XX_PWM_RES_TOGGLE,
+};
+
+struct lpc18xx_pwm_data {
+ unsigned int duty_event;
+};
+
+struct lpc18xx_pwm_chip {
+ struct device *dev;
+ struct pwm_chip chip;
+ void __iomem *base;
+ struct clk *pwm_clk;
+ unsigned long clk_rate;
+ unsigned int period_ns;
+ unsigned int min_period_ns;
+ unsigned int max_period_ns;
+ unsigned int period_event;
+ unsigned long event_map;
+ struct mutex res_lock;
+ struct mutex period_lock;
+};
+
+static inline struct lpc18xx_pwm_chip *
+to_lpc18xx_pwm_chip(struct pwm_chip *chip)
+{
+ return container_of(chip, struct lpc18xx_pwm_chip, chip);
+}
+
+static inline void lpc18xx_pwm_writel(struct lpc18xx_pwm_chip *lpc18xx_pwm,
+ u32 reg, u32 val)
+{
+ writel(val, lpc18xx_pwm->base + reg);
+}
+
+static inline u32 lpc18xx_pwm_readl(struct lpc18xx_pwm_chip *lpc18xx_pwm,
+ u32 reg)
+{
+ return readl(lpc18xx_pwm->base + reg);
+}
+
+static void lpc18xx_pwm_set_conflict_res(struct lpc18xx_pwm_chip *lpc18xx_pwm,
+ struct pwm_device *pwm,
+ enum lpc18xx_pwm_res_action action)
+{
+ u32 val;
+
+ mutex_lock(&lpc18xx_pwm->res_lock);
+
+ /*
+ * Simultaneous set and clear may happen on an output, that is the case
+ * when duty_ns == period_ns. LPC18xx SCT allows to set a conflict
+ * resolution action to be taken in such a case.
+ */
+ val = lpc18xx_pwm_readl(lpc18xx_pwm, LPC18XX_PWM_RES_BASE);
+ val &= ~LPC18XX_PWM_RES_MASK(pwm->hwpwm);
+ val |= LPC18XX_PWM_RES(pwm->hwpwm, action);
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_RES_BASE, val);
+
+ mutex_unlock(&lpc18xx_pwm->res_lock);
+}
+
+static void lpc18xx_pwm_config_period(struct pwm_chip *chip, int period_ns)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ u64 val;
+
+ val = (u64)period_ns * lpc18xx_pwm->clk_rate;
+ do_div(val, NSEC_PER_SEC);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_MATCH(lpc18xx_pwm->period_event),
+ (u32)val - 1);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_MATCHREL(lpc18xx_pwm->period_event),
+ (u32)val - 1);
+}
+
+static void lpc18xx_pwm_config_duty(struct pwm_chip *chip,
+ struct pwm_device *pwm, int duty_ns)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ struct lpc18xx_pwm_data *lpc18xx_data = pwm_get_chip_data(pwm);
+ u64 val;
+
+ val = (u64)duty_ns * lpc18xx_pwm->clk_rate;
+ do_div(val, NSEC_PER_SEC);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_MATCH(lpc18xx_data->duty_event),
+ (u32)val);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_MATCHREL(lpc18xx_data->duty_event),
+ (u32)val);
+}
+
+static int lpc18xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ int requested_events, i;
+
+ if (period_ns < lpc18xx_pwm->min_period_ns ||
+ period_ns > lpc18xx_pwm->max_period_ns) {
+ dev_err(chip->dev, "period %d not in range\n", period_ns);
+ return -ERANGE;
+ }
+
+ mutex_lock(&lpc18xx_pwm->period_lock);
+
+ requested_events = bitmap_weight(&lpc18xx_pwm->event_map,
+ LPC18XX_PWM_EVENT_MAX);
+
+ /*
+ * The PWM supports only a single period for all PWM channels.
+ * Once the period is set, it can only be changed if no more than one
+ * channel is requested at that moment.
+ */
+ if (requested_events > 2 && lpc18xx_pwm->period_ns != period_ns &&
+ lpc18xx_pwm->period_ns) {
+ dev_err(chip->dev, "conflicting period requested for PWM %u\n",
+ pwm->hwpwm);
+ mutex_unlock(&lpc18xx_pwm->period_lock);
+ return -EBUSY;
+ }
+
+ if ((requested_events <= 2 && lpc18xx_pwm->period_ns != period_ns) ||
+ !lpc18xx_pwm->period_ns) {
+ lpc18xx_pwm->period_ns = period_ns;
+ for (i = 0; i < chip->npwm; i++)
+ pwm_set_period(&chip->pwms[i], period_ns);
+ lpc18xx_pwm_config_period(chip, period_ns);
+ }
+
+ mutex_unlock(&lpc18xx_pwm->period_lock);
+
+ lpc18xx_pwm_config_duty(chip, pwm, duty_ns);
+
+ return 0;
+}
+
+static int lpc18xx_pwm_set_polarity(struct pwm_chip *chip,
+ struct pwm_device *pwm,
+ enum pwm_polarity polarity)
+{
+ return 0;
+}
+
+static int lpc18xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ struct lpc18xx_pwm_data *lpc18xx_data = pwm_get_chip_data(pwm);
+ enum lpc18xx_pwm_res_action res_action;
+ unsigned int set_event, clear_event;
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_EVCTRL(lpc18xx_data->duty_event),
+ LPC18XX_PWM_EVCTRL_MATCH(lpc18xx_data->duty_event) |
+ LPC18XX_PWM_EVCTRL_COMB_MATCH);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_EVSTATEMSK(lpc18xx_data->duty_event),
+ LPC18XX_PWM_EVSTATEMSK_ALL);
+
+ if (pwm->polarity == PWM_POLARITY_NORMAL) {
+ set_event = lpc18xx_pwm->period_event;
+ clear_event = lpc18xx_data->duty_event;
+ res_action = LPC18XX_PWM_RES_SET;
+ } else {
+ set_event = lpc18xx_data->duty_event;
+ clear_event = lpc18xx_pwm->period_event;
+ res_action = LPC18XX_PWM_RES_CLEAR;
+ }
+
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_OUTPUTSET(pwm->hwpwm),
+ BIT(set_event));
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_OUTPUTCL(pwm->hwpwm),
+ BIT(clear_event));
+ lpc18xx_pwm_set_conflict_res(lpc18xx_pwm, pwm, res_action);
+
+ return 0;
+}
+
+static void lpc18xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ struct lpc18xx_pwm_data *lpc18xx_data = pwm_get_chip_data(pwm);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_EVCTRL(lpc18xx_data->duty_event), 0);
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_OUTPUTSET(pwm->hwpwm), 0);
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_OUTPUTCL(pwm->hwpwm), 0);
+}
+
+static int lpc18xx_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ struct lpc18xx_pwm_data *lpc18xx_data = pwm_get_chip_data(pwm);
+ unsigned long event;
+
+ event = find_first_zero_bit(&lpc18xx_pwm->event_map,
+ LPC18XX_PWM_EVENT_MAX);
+
+ if (event >= LPC18XX_PWM_EVENT_MAX) {
+ dev_err(lpc18xx_pwm->dev,
+ "maximum number of simultaneous channels reached\n");
+ return -EBUSY;
+ };
+
+ set_bit(event, &lpc18xx_pwm->event_map);
+ lpc18xx_data->duty_event = event;
+ lpc18xx_pwm_config_duty(chip, pwm, pwm_get_duty_cycle(pwm));
+
+ return 0;
+}
+
+static void lpc18xx_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = to_lpc18xx_pwm_chip(chip);
+ struct lpc18xx_pwm_data *lpc18xx_data = pwm_get_chip_data(pwm);
+
+ pwm_disable(pwm);
+ pwm_set_duty_cycle(pwm, 0);
+ clear_bit(lpc18xx_data->duty_event, &lpc18xx_pwm->event_map);
+}
+
+static const struct pwm_ops lpc18xx_pwm_ops = {
+ .config = lpc18xx_pwm_config,
+ .set_polarity = lpc18xx_pwm_set_polarity,
+ .enable = lpc18xx_pwm_enable,
+ .disable = lpc18xx_pwm_disable,
+ .request = lpc18xx_pwm_request,
+ .free = lpc18xx_pwm_free,
+ .owner = THIS_MODULE,
+};
+
+static const struct of_device_id lpc18xx_pwm_of_match[] = {
+ { .compatible = "nxp,lpc1850-sct-pwm" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, lpc18xx_pwm_of_match);
+
+static int lpc18xx_pwm_probe(struct platform_device *pdev)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm;
+ struct pwm_device *pwm;
+ struct resource *res;
+ int ret, i;
+ u64 val;
+
+ lpc18xx_pwm = devm_kzalloc(&pdev->dev, sizeof(*lpc18xx_pwm),
+ GFP_KERNEL);
+ if (!lpc18xx_pwm)
+ return -ENOMEM;
+
+ lpc18xx_pwm->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ lpc18xx_pwm->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(lpc18xx_pwm->base))
+ return PTR_ERR(lpc18xx_pwm->base);
+
+ lpc18xx_pwm->pwm_clk = devm_clk_get(&pdev->dev, "pwm");
+ if (IS_ERR(lpc18xx_pwm->pwm_clk)) {
+ dev_err(&pdev->dev, "failed to get pwm clock\n");
+ return PTR_ERR(lpc18xx_pwm->pwm_clk);
+ }
+
+ ret = clk_prepare_enable(lpc18xx_pwm->pwm_clk);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "could not prepare or enable pwm clock\n");
+ return ret;
+ }
+
+ lpc18xx_pwm->clk_rate = clk_get_rate(lpc18xx_pwm->pwm_clk);
+
+ mutex_init(&lpc18xx_pwm->res_lock);
+ mutex_init(&lpc18xx_pwm->period_lock);
+
+ val = (u64)NSEC_PER_SEC * LPC18XX_PWM_TIMER_MAX;
+ do_div(val, lpc18xx_pwm->clk_rate);
+ lpc18xx_pwm->max_period_ns = val;
+
+ lpc18xx_pwm->min_period_ns = DIV_ROUND_UP(NSEC_PER_SEC,
+ lpc18xx_pwm->clk_rate);
+
+ lpc18xx_pwm->chip.dev = &pdev->dev;
+ lpc18xx_pwm->chip.ops = &lpc18xx_pwm_ops;
+ lpc18xx_pwm->chip.base = -1;
+ lpc18xx_pwm->chip.npwm = 16;
+ lpc18xx_pwm->chip.of_xlate = of_pwm_xlate_with_flags;
+ lpc18xx_pwm->chip.of_pwm_n_cells = 3;
+
+ /* SCT counter must be in unify (32 bit) mode */
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_CONFIG,
+ LPC18XX_PWM_CONFIG_UNIFY);
+
+ /*
+ * Everytime the timer counter reaches the period value, the related
+ * event will be triggered and the counter reset to 0.
+ */
+ set_bit(LPC18XX_PWM_EVENT_PERIOD, &lpc18xx_pwm->event_map);
+ lpc18xx_pwm->period_event = LPC18XX_PWM_EVENT_PERIOD;
+
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_EVSTATEMSK(lpc18xx_pwm->period_event),
+ LPC18XX_PWM_EVSTATEMSK_ALL);
+
+ val = LPC18XX_PWM_EVCTRL_MATCH(lpc18xx_pwm->period_event) |
+ LPC18XX_PWM_EVCTRL_COMB_MATCH;
+ lpc18xx_pwm_writel(lpc18xx_pwm,
+ LPC18XX_PWM_EVCTRL(lpc18xx_pwm->period_event), val);
+
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_LIMIT,
+ BIT(lpc18xx_pwm->period_event));
+
+ ret = pwmchip_add(&lpc18xx_pwm->chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pwmchip_add failed: %d\n", ret);
+ goto disable_pwmclk;
+ }
+
+ for (i = 0; i < lpc18xx_pwm->chip.npwm; i++) {
+ pwm = &lpc18xx_pwm->chip.pwms[i];
+ pwm->chip_data = devm_kzalloc(lpc18xx_pwm->dev,
+ sizeof(struct lpc18xx_pwm_data),
+ GFP_KERNEL);
+ if (!pwm->chip_data) {
+ ret = -ENOMEM;
+ goto remove_pwmchip;
+ }
+ }
+
+ platform_set_drvdata(pdev, lpc18xx_pwm);
+
+ val = lpc18xx_pwm_readl(lpc18xx_pwm, LPC18XX_PWM_CTRL);
+ val &= ~LPC18XX_PWM_BIDIR;
+ val &= ~LPC18XX_PWM_CTRL_HALT;
+ val &= ~LPC18XX_PWM_PRE_MASK;
+ val |= LPC18XX_PWM_PRE(0);
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_CTRL, val);
+
+ return 0;
+
+remove_pwmchip:
+ pwmchip_remove(&lpc18xx_pwm->chip);
+disable_pwmclk:
+ clk_disable_unprepare(lpc18xx_pwm->pwm_clk);
+ return ret;
+}
+
+static int lpc18xx_pwm_remove(struct platform_device *pdev)
+{
+ struct lpc18xx_pwm_chip *lpc18xx_pwm = platform_get_drvdata(pdev);
+ u32 val;
+
+ val = lpc18xx_pwm_readl(lpc18xx_pwm, LPC18XX_PWM_CTRL);
+ lpc18xx_pwm_writel(lpc18xx_pwm, LPC18XX_PWM_CTRL,
+ val | LPC18XX_PWM_CTRL_HALT);
+
+ clk_disable_unprepare(lpc18xx_pwm->pwm_clk);
+
+ return pwmchip_remove(&lpc18xx_pwm->chip);
+}
+
+static struct platform_driver lpc18xx_pwm_driver = {
+ .driver = {
+ .name = "lpc18xx-sct-pwm",
+ .of_match_table = lpc18xx_pwm_of_match,
+ },
+ .probe = lpc18xx_pwm_probe,
+ .remove = lpc18xx_pwm_remove,
+};
+module_platform_driver(lpc18xx_pwm_driver);
+
+MODULE_AUTHOR("Ariel D'Alessandro <ariel@vanguardiasur.com.ar>");
+MODULE_DESCRIPTION("NXP LPC18xx PWM driver");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/pwm/pwm-lpss-pci.c b/kernel/drivers/pwm/pwm-lpss-pci.c
index cf20d2bea..7160e8ab3 100644
--- a/kernel/drivers/pwm/pwm-lpss-pci.c
+++ b/kernel/drivers/pwm/pwm-lpss-pci.c
@@ -13,6 +13,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/pm_runtime.h>
#include "pwm-lpss.h"
@@ -33,6 +34,10 @@ static int pwm_lpss_probe_pci(struct pci_dev *pdev,
return PTR_ERR(lpwm);
pci_set_drvdata(pdev, lpwm);
+
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
+
return 0;
}
@@ -40,14 +45,41 @@ static void pwm_lpss_remove_pci(struct pci_dev *pdev)
{
struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev);
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
pwm_lpss_remove(lpwm);
}
+#ifdef CONFIG_PM
+static int pwm_lpss_runtime_suspend_pci(struct device *dev)
+{
+ /*
+ * The PCI core will handle transition to D3 automatically. We only
+ * need to provide runtime PM hooks for that to happen.
+ */
+ return 0;
+}
+
+static int pwm_lpss_runtime_resume_pci(struct device *dev)
+{
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops pwm_lpss_pci_pm = {
+ SET_RUNTIME_PM_OPS(pwm_lpss_runtime_suspend_pci,
+ pwm_lpss_runtime_resume_pci, NULL)
+};
+
static const struct pci_device_id pwm_lpss_pci_ids[] = {
+ { PCI_VDEVICE(INTEL, 0x0ac8), (unsigned long)&pwm_lpss_bxt_info},
{ PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&pwm_lpss_byt_info},
{ PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&pwm_lpss_byt_info},
+ { PCI_VDEVICE(INTEL, 0x1ac8), (unsigned long)&pwm_lpss_bxt_info},
{ PCI_VDEVICE(INTEL, 0x2288), (unsigned long)&pwm_lpss_bsw_info},
{ PCI_VDEVICE(INTEL, 0x2289), (unsigned long)&pwm_lpss_bsw_info},
+ { PCI_VDEVICE(INTEL, 0x5ac8), (unsigned long)&pwm_lpss_bxt_info},
{ },
};
MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
@@ -57,6 +89,9 @@ static struct pci_driver pwm_lpss_driver_pci = {
.id_table = pwm_lpss_pci_ids,
.probe = pwm_lpss_probe_pci,
.remove = pwm_lpss_remove_pci,
+ .driver = {
+ .pm = &pwm_lpss_pci_pm,
+ },
};
module_pci_driver(pwm_lpss_driver_pci);
diff --git a/kernel/drivers/pwm/pwm-lpss-platform.c b/kernel/drivers/pwm/pwm-lpss-platform.c
index 18a9c880a..54433fc6d 100644
--- a/kernel/drivers/pwm/pwm-lpss-platform.c
+++ b/kernel/drivers/pwm/pwm-lpss-platform.c
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include "pwm-lpss.h"
@@ -36,6 +37,10 @@ static int pwm_lpss_probe_platform(struct platform_device *pdev)
return PTR_ERR(lpwm);
platform_set_drvdata(pdev, lpwm);
+
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
return 0;
}
@@ -43,12 +48,14 @@ static int pwm_lpss_remove_platform(struct platform_device *pdev)
{
struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
+ pm_runtime_disable(&pdev->dev);
return pwm_lpss_remove(lpwm);
}
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
+ { "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
{ },
};
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
diff --git a/kernel/drivers/pwm/pwm-lpss.c b/kernel/drivers/pwm/pwm-lpss.c
index e9798253a..250441040 100644
--- a/kernel/drivers/pwm/pwm-lpss.c
+++ b/kernel/drivers/pwm/pwm-lpss.c
@@ -16,6 +16,7 @@
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#include "pwm-lpss.h"
@@ -29,6 +30,9 @@
#define PWM_LIMIT (0x8000 + PWM_DIVISION_CORRECTION)
#define NSECS_PER_SEC 1000000000UL
+/* Size of each PWM register space if multiple */
+#define PWM_SIZE 0x400
+
struct pwm_lpss_chip {
struct pwm_chip chip;
void __iomem *regs;
@@ -37,21 +41,44 @@ struct pwm_lpss_chip {
/* BayTrail */
const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
- .clk_rate = 25000000
+ .clk_rate = 25000000,
+ .npwm = 1,
};
EXPORT_SYMBOL_GPL(pwm_lpss_byt_info);
/* Braswell */
const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
- .clk_rate = 19200000
+ .clk_rate = 19200000,
+ .npwm = 1,
};
EXPORT_SYMBOL_GPL(pwm_lpss_bsw_info);
+/* Broxton */
+const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
+ .clk_rate = 19200000,
+ .npwm = 4,
+};
+EXPORT_SYMBOL_GPL(pwm_lpss_bxt_info);
+
static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
{
return container_of(chip, struct pwm_lpss_chip, chip);
}
+static inline u32 pwm_lpss_read(const struct pwm_device *pwm)
+{
+ struct pwm_lpss_chip *lpwm = to_lpwm(pwm->chip);
+
+ return readl(lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM);
+}
+
+static inline void pwm_lpss_write(const struct pwm_device *pwm, u32 value)
+{
+ struct pwm_lpss_chip *lpwm = to_lpwm(pwm->chip);
+
+ writel(value, lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM);
+}
+
static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_ns, int period_ns)
{
@@ -79,38 +106,36 @@ static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
duty_ns = 1;
on_time_div = 255 - (255 * duty_ns / period_ns);
- ctrl = readl(lpwm->regs + PWM);
+ pm_runtime_get_sync(chip->dev);
+
+ ctrl = pwm_lpss_read(pwm);
ctrl &= ~(PWM_BASE_UNIT_MASK | PWM_ON_TIME_DIV_MASK);
ctrl |= (u16) base_unit << PWM_BASE_UNIT_SHIFT;
ctrl |= on_time_div;
/* request PWM to update on next cycle */
ctrl |= PWM_SW_UPDATE;
- writel(ctrl, lpwm->regs + PWM);
+ pwm_lpss_write(pwm, ctrl);
+
+ pm_runtime_put(chip->dev);
return 0;
}
static int pwm_lpss_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
- struct pwm_lpss_chip *lpwm = to_lpwm(chip);
- u32 ctrl;
-
- ctrl = readl(lpwm->regs + PWM);
- writel(ctrl | PWM_ENABLE, lpwm->regs + PWM);
-
+ pm_runtime_get_sync(chip->dev);
+ pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_ENABLE);
return 0;
}
static void pwm_lpss_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
- struct pwm_lpss_chip *lpwm = to_lpwm(chip);
- u32 ctrl;
-
- ctrl = readl(lpwm->regs + PWM);
- writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
+ pwm_lpss_write(pwm, pwm_lpss_read(pwm) & ~PWM_ENABLE);
+ pm_runtime_put(chip->dev);
}
static const struct pwm_ops pwm_lpss_ops = {
+ .free = pwm_lpss_disable,
.config = pwm_lpss_config,
.enable = pwm_lpss_enable,
.disable = pwm_lpss_disable,
@@ -135,7 +160,7 @@ struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
lpwm->chip.dev = dev;
lpwm->chip.ops = &pwm_lpss_ops;
lpwm->chip.base = -1;
- lpwm->chip.npwm = 1;
+ lpwm->chip.npwm = info->npwm;
ret = pwmchip_add(&lpwm->chip);
if (ret) {
@@ -149,11 +174,6 @@ EXPORT_SYMBOL_GPL(pwm_lpss_probe);
int pwm_lpss_remove(struct pwm_lpss_chip *lpwm)
{
- u32 ctrl;
-
- ctrl = readl(lpwm->regs + PWM);
- writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
-
return pwmchip_remove(&lpwm->chip);
}
EXPORT_SYMBOL_GPL(pwm_lpss_remove);
diff --git a/kernel/drivers/pwm/pwm-lpss.h b/kernel/drivers/pwm/pwm-lpss.h
index aa041bb1b..e8cf337ae 100644
--- a/kernel/drivers/pwm/pwm-lpss.h
+++ b/kernel/drivers/pwm/pwm-lpss.h
@@ -20,10 +20,12 @@ struct pwm_lpss_chip;
struct pwm_lpss_boardinfo {
unsigned long clk_rate;
+ unsigned int npwm;
};
extern const struct pwm_lpss_boardinfo pwm_lpss_byt_info;
extern const struct pwm_lpss_boardinfo pwm_lpss_bsw_info;
+extern const struct pwm_lpss_boardinfo pwm_lpss_bxt_info;
struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
const struct pwm_lpss_boardinfo *info);
diff --git a/kernel/drivers/pwm/pwm-mtk-disp.c b/kernel/drivers/pwm/pwm-mtk-disp.c
new file mode 100644
index 000000000..0ad338529
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-mtk-disp.c
@@ -0,0 +1,243 @@
+/*
+ * MediaTek display pulse-width-modulation controller driver.
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: YH Huang <yh.huang@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+#define DISP_PWM_EN 0x00
+#define PWM_ENABLE_MASK BIT(0)
+
+#define DISP_PWM_COMMIT 0x08
+#define PWM_COMMIT_MASK BIT(0)
+
+#define DISP_PWM_CON_0 0x10
+#define PWM_CLKDIV_SHIFT 16
+#define PWM_CLKDIV_MAX 0x3ff
+#define PWM_CLKDIV_MASK (PWM_CLKDIV_MAX << PWM_CLKDIV_SHIFT)
+
+#define DISP_PWM_CON_1 0x14
+#define PWM_PERIOD_BIT_WIDTH 12
+#define PWM_PERIOD_MASK ((1 << PWM_PERIOD_BIT_WIDTH) - 1)
+
+#define PWM_HIGH_WIDTH_SHIFT 16
+#define PWM_HIGH_WIDTH_MASK (0x1fff << PWM_HIGH_WIDTH_SHIFT)
+
+struct mtk_disp_pwm {
+ struct pwm_chip chip;
+ struct clk *clk_main;
+ struct clk *clk_mm;
+ void __iomem *base;
+};
+
+static inline struct mtk_disp_pwm *to_mtk_disp_pwm(struct pwm_chip *chip)
+{
+ return container_of(chip, struct mtk_disp_pwm, chip);
+}
+
+static void mtk_disp_pwm_update_bits(struct mtk_disp_pwm *mdp, u32 offset,
+ u32 mask, u32 data)
+{
+ void __iomem *address = mdp->base + offset;
+ u32 value;
+
+ value = readl(address);
+ value &= ~mask;
+ value |= data;
+ writel(value, address);
+}
+
+static int mtk_disp_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip);
+ u32 clk_div, period, high_width, value;
+ u64 div, rate;
+ int err;
+
+ /*
+ * Find period, high_width and clk_div to suit duty_ns and period_ns.
+ * Calculate proper div value to keep period value in the bound.
+ *
+ * period_ns = 10^9 * (clk_div + 1) * (period + 1) / PWM_CLK_RATE
+ * duty_ns = 10^9 * (clk_div + 1) * high_width / PWM_CLK_RATE
+ *
+ * period = (PWM_CLK_RATE * period_ns) / (10^9 * (clk_div + 1)) - 1
+ * high_width = (PWM_CLK_RATE * duty_ns) / (10^9 * (clk_div + 1))
+ */
+ rate = clk_get_rate(mdp->clk_main);
+ clk_div = div_u64(rate * period_ns, NSEC_PER_SEC) >>
+ PWM_PERIOD_BIT_WIDTH;
+ if (clk_div > PWM_CLKDIV_MAX)
+ return -EINVAL;
+
+ div = NSEC_PER_SEC * (clk_div + 1);
+ period = div64_u64(rate * period_ns, div);
+ if (period > 0)
+ period--;
+
+ high_width = div64_u64(rate * duty_ns, div);
+ value = period | (high_width << PWM_HIGH_WIDTH_SHIFT);
+
+ err = clk_enable(mdp->clk_main);
+ if (err < 0)
+ return err;
+
+ err = clk_enable(mdp->clk_mm);
+ if (err < 0) {
+ clk_disable(mdp->clk_main);
+ return err;
+ }
+
+ mtk_disp_pwm_update_bits(mdp, DISP_PWM_CON_0, PWM_CLKDIV_MASK,
+ clk_div << PWM_CLKDIV_SHIFT);
+ mtk_disp_pwm_update_bits(mdp, DISP_PWM_CON_1,
+ PWM_PERIOD_MASK | PWM_HIGH_WIDTH_MASK, value);
+ mtk_disp_pwm_update_bits(mdp, DISP_PWM_COMMIT, PWM_COMMIT_MASK, 1);
+ mtk_disp_pwm_update_bits(mdp, DISP_PWM_COMMIT, PWM_COMMIT_MASK, 0);
+
+ clk_disable(mdp->clk_mm);
+ clk_disable(mdp->clk_main);
+
+ return 0;
+}
+
+static int mtk_disp_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip);
+ int err;
+
+ err = clk_enable(mdp->clk_main);
+ if (err < 0)
+ return err;
+
+ err = clk_enable(mdp->clk_mm);
+ if (err < 0) {
+ clk_disable(mdp->clk_main);
+ return err;
+ }
+
+ mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, PWM_ENABLE_MASK, 1);
+
+ return 0;
+}
+
+static void mtk_disp_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip);
+
+ mtk_disp_pwm_update_bits(mdp, DISP_PWM_EN, PWM_ENABLE_MASK, 0);
+
+ clk_disable(mdp->clk_mm);
+ clk_disable(mdp->clk_main);
+}
+
+static const struct pwm_ops mtk_disp_pwm_ops = {
+ .config = mtk_disp_pwm_config,
+ .enable = mtk_disp_pwm_enable,
+ .disable = mtk_disp_pwm_disable,
+ .owner = THIS_MODULE,
+};
+
+static int mtk_disp_pwm_probe(struct platform_device *pdev)
+{
+ struct mtk_disp_pwm *mdp;
+ struct resource *r;
+ int ret;
+
+ mdp = devm_kzalloc(&pdev->dev, sizeof(*mdp), GFP_KERNEL);
+ if (!mdp)
+ return -ENOMEM;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mdp->base = devm_ioremap_resource(&pdev->dev, r);
+ if (IS_ERR(mdp->base))
+ return PTR_ERR(mdp->base);
+
+ mdp->clk_main = devm_clk_get(&pdev->dev, "main");
+ if (IS_ERR(mdp->clk_main))
+ return PTR_ERR(mdp->clk_main);
+
+ mdp->clk_mm = devm_clk_get(&pdev->dev, "mm");
+ if (IS_ERR(mdp->clk_mm))
+ return PTR_ERR(mdp->clk_mm);
+
+ ret = clk_prepare(mdp->clk_main);
+ if (ret < 0)
+ return ret;
+
+ ret = clk_prepare(mdp->clk_mm);
+ if (ret < 0)
+ goto disable_clk_main;
+
+ mdp->chip.dev = &pdev->dev;
+ mdp->chip.ops = &mtk_disp_pwm_ops;
+ mdp->chip.base = -1;
+ mdp->chip.npwm = 1;
+
+ ret = pwmchip_add(&mdp->chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
+ goto disable_clk_mm;
+ }
+
+ platform_set_drvdata(pdev, mdp);
+
+ return 0;
+
+disable_clk_mm:
+ clk_unprepare(mdp->clk_mm);
+disable_clk_main:
+ clk_unprepare(mdp->clk_main);
+ return ret;
+}
+
+static int mtk_disp_pwm_remove(struct platform_device *pdev)
+{
+ struct mtk_disp_pwm *mdp = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = pwmchip_remove(&mdp->chip);
+ clk_unprepare(mdp->clk_mm);
+ clk_unprepare(mdp->clk_main);
+
+ return ret;
+}
+
+static const struct of_device_id mtk_disp_pwm_of_match[] = {
+ { .compatible = "mediatek,mt8173-disp-pwm" },
+ { .compatible = "mediatek,mt6595-disp-pwm" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mtk_disp_pwm_of_match);
+
+static struct platform_driver mtk_disp_pwm_driver = {
+ .driver = {
+ .name = "mediatek-disp-pwm",
+ .of_match_table = mtk_disp_pwm_of_match,
+ },
+ .probe = mtk_disp_pwm_probe,
+ .remove = mtk_disp_pwm_remove,
+};
+module_platform_driver(mtk_disp_pwm_driver);
+
+MODULE_AUTHOR("YH Huang <yh.huang@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek SoC display PWM driver");
+MODULE_LICENSE("GPL v2");
diff --git a/kernel/drivers/pwm/pwm-mxs.c b/kernel/drivers/pwm/pwm-mxs.c
index b430811e1..9a596324e 100644
--- a/kernel/drivers/pwm/pwm-mxs.c
+++ b/kernel/drivers/pwm/pwm-mxs.c
@@ -77,7 +77,7 @@ static int mxs_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
* If the PWM channel is disabled, make sure to turn on the clock
* before writing the register. Otherwise, keep it enabled.
*/
- if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (!pwm_is_enabled(pwm)) {
ret = clk_prepare_enable(mxs->clk);
if (ret)
return ret;
@@ -92,7 +92,7 @@ static int mxs_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/*
* If the PWM is not enabled, turn the clock off again to save power.
*/
- if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ if (!pwm_is_enabled(pwm))
clk_disable_unprepare(mxs->clk);
return 0;
diff --git a/kernel/drivers/pwm/pwm-pca9685.c b/kernel/drivers/pwm/pwm-pca9685.c
index 34b5c275a..117fccf79 100644
--- a/kernel/drivers/pwm/pwm-pca9685.c
+++ b/kernel/drivers/pwm/pwm-pca9685.c
@@ -2,6 +2,7 @@
* Driver for PCA9685 16-channel 12-bit PWM LED controller
*
* Copyright (C) 2013 Steffen Trumtrar <s.trumtrar@pengutronix.de>
+ * Copyright (C) 2015 Clemens Gruber <clemens.gruber@pqgruber.com>
*
* based on the pwm-twl-led.c driver
*
@@ -18,12 +19,23 @@
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_device.h>
+#include <linux/property.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/slab.h>
+#include <linux/delay.h>
+
+/*
+ * Because the PCA9685 has only one prescaler per chip, changing the period of
+ * one channel affects the period of all 16 PWM outputs!
+ * However, the ratio between each configured duty cycle and the chip-wide
+ * period remains constant, because the OFF time is set in proportion to the
+ * counter range.
+ */
#define PCA9685_MODE1 0x00
#define PCA9685_MODE2 0x01
@@ -42,10 +54,18 @@
#define PCA9685_ALL_LED_OFF_H 0xFD
#define PCA9685_PRESCALE 0xFE
+#define PCA9685_PRESCALE_MIN 0x03 /* => max. frequency of 1526 Hz */
+#define PCA9685_PRESCALE_MAX 0xFF /* => min. frequency of 24 Hz */
+
+#define PCA9685_COUNTER_RANGE 4096
+#define PCA9685_DEFAULT_PERIOD 5000000 /* Default period_ns = 1/200 Hz */
+#define PCA9685_OSC_CLOCK_MHZ 25 /* Internal oscillator with 25 MHz */
+
#define PCA9685_NUMREGS 0xFF
#define PCA9685_MAXCHAN 0x10
#define LED_FULL (1 << 4)
+#define MODE1_RESTART (1 << 7)
#define MODE1_SLEEP (1 << 4)
#define MODE2_INVRT (1 << 4)
#define MODE2_OUTDRV (1 << 2)
@@ -59,6 +79,8 @@ struct pca9685 {
struct pwm_chip chip;
struct regmap *regmap;
int active_cnt;
+ int duty_ns;
+ int period_ns;
};
static inline struct pca9685 *to_pca(struct pwm_chip *chip)
@@ -72,6 +94,47 @@ static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
struct pca9685 *pca = to_pca(chip);
unsigned long long duty;
unsigned int reg;
+ int prescale;
+
+ if (period_ns != pca->period_ns) {
+ prescale = DIV_ROUND_CLOSEST(PCA9685_OSC_CLOCK_MHZ * period_ns,
+ PCA9685_COUNTER_RANGE * 1000) - 1;
+
+ if (prescale >= PCA9685_PRESCALE_MIN &&
+ prescale <= PCA9685_PRESCALE_MAX) {
+ /* Put chip into sleep mode */
+ regmap_update_bits(pca->regmap, PCA9685_MODE1,
+ MODE1_SLEEP, MODE1_SLEEP);
+
+ /* Change the chip-wide output frequency */
+ regmap_write(pca->regmap, PCA9685_PRESCALE, prescale);
+
+ /* Wake the chip up */
+ regmap_update_bits(pca->regmap, PCA9685_MODE1,
+ MODE1_SLEEP, 0x0);
+
+ /* Wait 500us for the oscillator to be back up */
+ udelay(500);
+
+ pca->period_ns = period_ns;
+
+ /*
+ * If the duty cycle did not change, restart PWM with
+ * the same duty cycle to period ratio and return.
+ */
+ if (duty_ns == pca->duty_ns) {
+ regmap_update_bits(pca->regmap, PCA9685_MODE1,
+ MODE1_RESTART, 0x1);
+ return 0;
+ }
+ } else {
+ dev_err(chip->dev,
+ "prescaler not set: period out of bounds!\n");
+ return -EINVAL;
+ }
+ }
+
+ pca->duty_ns = duty_ns;
if (duty_ns < 1) {
if (pwm->hwpwm >= PCA9685_MAXCHAN)
@@ -85,6 +148,22 @@ static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
}
if (duty_ns == period_ns) {
+ /* Clear both OFF registers */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_L;
+ else
+ reg = LED_N_OFF_L(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0x0);
+
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_OFF_H;
+ else
+ reg = LED_N_OFF_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0x0);
+
+ /* Set the full ON bit */
if (pwm->hwpwm >= PCA9685_MAXCHAN)
reg = PCA9685_ALL_LED_ON_H;
else
@@ -95,7 +174,7 @@ static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
return 0;
}
- duty = 4096 * (unsigned long long)duty_ns;
+ duty = PCA9685_COUNTER_RANGE * (unsigned long long)duty_ns;
duty = DIV_ROUND_UP_ULL(duty, period_ns);
if (pwm->hwpwm >= PCA9685_MAXCHAN)
@@ -112,6 +191,14 @@ static int pca9685_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
regmap_write(pca->regmap, reg, ((int)duty >> 8) & 0xf);
+ /* Clear the full ON bit, otherwise the set OFF time has no effect */
+ if (pwm->hwpwm >= PCA9685_MAXCHAN)
+ reg = PCA9685_ALL_LED_ON_H;
+ else
+ reg = LED_N_ON_H(pwm->hwpwm);
+
+ regmap_write(pca->regmap, reg, 0);
+
return 0;
}
@@ -212,7 +299,6 @@ static const struct regmap_config pca9685_regmap_i2c_config = {
static int pca9685_pwm_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- struct device_node *np = client->dev.of_node;
struct pca9685 *pca;
int ret;
int mode2;
@@ -228,17 +314,19 @@ static int pca9685_pwm_probe(struct i2c_client *client,
ret);
return ret;
}
+ pca->duty_ns = 0;
+ pca->period_ns = PCA9685_DEFAULT_PERIOD;
i2c_set_clientdata(client, pca);
regmap_read(pca->regmap, PCA9685_MODE2, &mode2);
- if (of_property_read_bool(np, "invert"))
+ if (device_property_read_bool(&client->dev, "invert"))
mode2 |= MODE2_INVRT;
else
mode2 &= ~MODE2_INVRT;
- if (of_property_read_bool(np, "open-drain"))
+ if (device_property_read_bool(&client->dev, "open-drain"))
mode2 &= ~MODE2_OUTDRV;
else
mode2 |= MODE2_OUTDRV;
@@ -276,17 +364,27 @@ static const struct i2c_device_id pca9685_id[] = {
};
MODULE_DEVICE_TABLE(i2c, pca9685_id);
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id pca9685_acpi_ids[] = {
+ { "INT3492", 0 },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(acpi, pca9685_acpi_ids);
+#endif
+
+#ifdef CONFIG_OF
static const struct of_device_id pca9685_dt_ids[] = {
{ .compatible = "nxp,pca9685-pwm", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, pca9685_dt_ids);
+#endif
static struct i2c_driver pca9685_i2c_driver = {
.driver = {
.name = "pca9685-pwm",
- .owner = THIS_MODULE,
- .of_match_table = pca9685_dt_ids,
+ .acpi_match_table = ACPI_PTR(pca9685_acpi_ids),
+ .of_match_table = of_match_ptr(pca9685_dt_ids),
},
.probe = pca9685_pwm_probe,
.remove = pca9685_pwm_remove,
diff --git a/kernel/drivers/pwm/pwm-rcar.c b/kernel/drivers/pwm/pwm-rcar.c
new file mode 100644
index 000000000..6e99a63ff
--- /dev/null
+++ b/kernel/drivers/pwm/pwm-rcar.c
@@ -0,0 +1,274 @@
+/*
+ * R-Car PWM Timer driver
+ *
+ * Copyright (C) 2015 Renesas Electronics Corporation
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/pwm.h>
+#include <linux/slab.h>
+
+#define RCAR_PWM_MAX_DIVISION 24
+#define RCAR_PWM_MAX_CYCLE 1023
+
+#define RCAR_PWMCR 0x00
+#define RCAR_PWMCR_CC0_MASK 0x000f0000
+#define RCAR_PWMCR_CC0_SHIFT 16
+#define RCAR_PWMCR_CCMD BIT(15)
+#define RCAR_PWMCR_SYNC BIT(11)
+#define RCAR_PWMCR_SS0 BIT(4)
+#define RCAR_PWMCR_EN0 BIT(0)
+
+#define RCAR_PWMCNT 0x04
+#define RCAR_PWMCNT_CYC0_MASK 0x03ff0000
+#define RCAR_PWMCNT_CYC0_SHIFT 16
+#define RCAR_PWMCNT_PH0_MASK 0x000003ff
+#define RCAR_PWMCNT_PH0_SHIFT 0
+
+struct rcar_pwm_chip {
+ struct pwm_chip chip;
+ void __iomem *base;
+ struct clk *clk;
+};
+
+static inline struct rcar_pwm_chip *to_rcar_pwm_chip(struct pwm_chip *chip)
+{
+ return container_of(chip, struct rcar_pwm_chip, chip);
+}
+
+static void rcar_pwm_write(struct rcar_pwm_chip *rp, u32 data,
+ unsigned int offset)
+{
+ writel(data, rp->base + offset);
+}
+
+static u32 rcar_pwm_read(struct rcar_pwm_chip *rp, unsigned int offset)
+{
+ return readl(rp->base + offset);
+}
+
+static void rcar_pwm_update(struct rcar_pwm_chip *rp, u32 mask, u32 data,
+ unsigned int offset)
+{
+ u32 value;
+
+ value = rcar_pwm_read(rp, offset);
+ value &= ~mask;
+ value |= data & mask;
+ rcar_pwm_write(rp, value, offset);
+}
+
+static int rcar_pwm_get_clock_division(struct rcar_pwm_chip *rp, int period_ns)
+{
+ unsigned long clk_rate = clk_get_rate(rp->clk);
+ unsigned long long max; /* max cycle / nanoseconds */
+ unsigned int div;
+
+ if (clk_rate == 0)
+ return -EINVAL;
+
+ for (div = 0; div <= RCAR_PWM_MAX_DIVISION; div++) {
+ max = (unsigned long long)NSEC_PER_SEC * RCAR_PWM_MAX_CYCLE *
+ (1 << div);
+ do_div(max, clk_rate);
+ if (period_ns < max)
+ break;
+ }
+
+ return (div <= RCAR_PWM_MAX_DIVISION) ? div : -ERANGE;
+}
+
+static void rcar_pwm_set_clock_control(struct rcar_pwm_chip *rp,
+ unsigned int div)
+{
+ u32 value;
+
+ value = rcar_pwm_read(rp, RCAR_PWMCR);
+ value &= ~(RCAR_PWMCR_CCMD | RCAR_PWMCR_CC0_MASK);
+
+ if (div & 1)
+ value |= RCAR_PWMCR_CCMD;
+
+ div >>= 1;
+
+ value |= div << RCAR_PWMCR_CC0_SHIFT;
+ rcar_pwm_write(rp, value, RCAR_PWMCR);
+}
+
+static int rcar_pwm_set_counter(struct rcar_pwm_chip *rp, int div, int duty_ns,
+ int period_ns)
+{
+ unsigned long long one_cycle, tmp; /* 0.01 nanoseconds */
+ unsigned long clk_rate = clk_get_rate(rp->clk);
+ u32 cyc, ph;
+
+ one_cycle = (unsigned long long)NSEC_PER_SEC * 100ULL * (1 << div);
+ do_div(one_cycle, clk_rate);
+
+ tmp = period_ns * 100ULL;
+ do_div(tmp, one_cycle);
+ cyc = (tmp << RCAR_PWMCNT_CYC0_SHIFT) & RCAR_PWMCNT_CYC0_MASK;
+
+ tmp = duty_ns * 100ULL;
+ do_div(tmp, one_cycle);
+ ph = tmp & RCAR_PWMCNT_PH0_MASK;
+
+ /* Avoid prohibited setting */
+ if (cyc == 0 || ph == 0)
+ return -EINVAL;
+
+ rcar_pwm_write(rp, cyc | ph, RCAR_PWMCNT);
+
+ return 0;
+}
+
+static int rcar_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
+
+ return clk_prepare_enable(rp->clk);
+}
+
+static void rcar_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
+
+ clk_disable_unprepare(rp->clk);
+}
+
+static int rcar_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
+ int div, ret;
+
+ div = rcar_pwm_get_clock_division(rp, period_ns);
+ if (div < 0)
+ return div;
+
+ /* Let the core driver set pwm->period if disabled and duty_ns == 0 */
+ if (!test_bit(PWMF_ENABLED, &pwm->flags) && !duty_ns)
+ return 0;
+
+ rcar_pwm_update(rp, RCAR_PWMCR_SYNC, RCAR_PWMCR_SYNC, RCAR_PWMCR);
+
+ ret = rcar_pwm_set_counter(rp, div, duty_ns, period_ns);
+ if (!ret)
+ rcar_pwm_set_clock_control(rp, div);
+
+ /* The SYNC should be set to 0 even if rcar_pwm_set_counter failed */
+ rcar_pwm_update(rp, RCAR_PWMCR_SYNC, 0, RCAR_PWMCR);
+
+ return ret;
+}
+
+static int rcar_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
+ u32 value;
+
+ /* Don't enable the PWM device if CYC0 or PH0 is 0 */
+ value = rcar_pwm_read(rp, RCAR_PWMCNT);
+ if ((value & RCAR_PWMCNT_CYC0_MASK) == 0 ||
+ (value & RCAR_PWMCNT_PH0_MASK) == 0)
+ return -EINVAL;
+
+ rcar_pwm_update(rp, RCAR_PWMCR_EN0, RCAR_PWMCR_EN0, RCAR_PWMCR);
+
+ return 0;
+}
+
+static void rcar_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
+
+ rcar_pwm_update(rp, RCAR_PWMCR_EN0, 0, RCAR_PWMCR);
+}
+
+static const struct pwm_ops rcar_pwm_ops = {
+ .request = rcar_pwm_request,
+ .free = rcar_pwm_free,
+ .config = rcar_pwm_config,
+ .enable = rcar_pwm_enable,
+ .disable = rcar_pwm_disable,
+ .owner = THIS_MODULE,
+};
+
+static int rcar_pwm_probe(struct platform_device *pdev)
+{
+ struct rcar_pwm_chip *rcar_pwm;
+ struct resource *res;
+ int ret;
+
+ rcar_pwm = devm_kzalloc(&pdev->dev, sizeof(*rcar_pwm), GFP_KERNEL);
+ if (rcar_pwm == NULL)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ rcar_pwm->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(rcar_pwm->base))
+ return PTR_ERR(rcar_pwm->base);
+
+ rcar_pwm->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(rcar_pwm->clk)) {
+ dev_err(&pdev->dev, "cannot get clock\n");
+ return PTR_ERR(rcar_pwm->clk);
+ }
+
+ platform_set_drvdata(pdev, rcar_pwm);
+
+ rcar_pwm->chip.dev = &pdev->dev;
+ rcar_pwm->chip.ops = &rcar_pwm_ops;
+ rcar_pwm->chip.base = -1;
+ rcar_pwm->chip.npwm = 1;
+
+ ret = pwmchip_add(&rcar_pwm->chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to register PWM chip: %d\n", ret);
+ return ret;
+ }
+
+ pm_runtime_enable(&pdev->dev);
+
+ return 0;
+}
+
+static int rcar_pwm_remove(struct platform_device *pdev)
+{
+ struct rcar_pwm_chip *rcar_pwm = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(&pdev->dev);
+
+ return pwmchip_remove(&rcar_pwm->chip);
+}
+
+static const struct of_device_id rcar_pwm_of_table[] = {
+ { .compatible = "renesas,pwm-rcar", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, rcar_pwm_of_table);
+
+static struct platform_driver rcar_pwm_driver = {
+ .probe = rcar_pwm_probe,
+ .remove = rcar_pwm_remove,
+ .driver = {
+ .name = "pwm-rcar",
+ .of_match_table = of_match_ptr(rcar_pwm_of_table),
+ }
+};
+module_platform_driver(rcar_pwm_driver);
+
+MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
+MODULE_DESCRIPTION("Renesas PWM Timer Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:pwm-rcar");
diff --git a/kernel/drivers/pwm/pwm-renesas-tpu.c b/kernel/drivers/pwm/pwm-renesas-tpu.c
index ee63f9e9d..075c1a764 100644
--- a/kernel/drivers/pwm/pwm-renesas-tpu.c
+++ b/kernel/drivers/pwm/pwm-renesas-tpu.c
@@ -301,7 +301,7 @@ static int tpu_pwm_config(struct pwm_chip *chip, struct pwm_device *_pwm,
pwm->duty = duty;
/* If the channel is disabled we're done. */
- if (!test_bit(PWMF_ENABLED, &_pwm->flags))
+ if (!pwm_is_enabled(_pwm))
return 0;
if (duty_only && pwm->timer_on) {
diff --git a/kernel/drivers/pwm/pwm-rockchip.c b/kernel/drivers/pwm/pwm-rockchip.c
index 9442df244..7d9cc9049 100644
--- a/kernel/drivers/pwm/pwm-rockchip.c
+++ b/kernel/drivers/pwm/pwm-rockchip.c
@@ -83,7 +83,7 @@ static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip,
PWM_CONTINUOUS;
u32 val;
- if (pwm->polarity == PWM_POLARITY_INVERSED)
+ if (pwm_get_polarity(pwm) == PWM_POLARITY_INVERSED)
enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSITIVE;
else
enable_conf |= PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE;
diff --git a/kernel/drivers/pwm/pwm-samsung.c b/kernel/drivers/pwm/pwm-samsung.c
index ff201e1b9..ada2d326d 100644
--- a/kernel/drivers/pwm/pwm-samsung.c
+++ b/kernel/drivers/pwm/pwm-samsung.c
@@ -456,6 +456,7 @@ static const struct of_device_id samsung_pwm_matches[] = {
{ .compatible = "samsung,exynos4210-pwm", .data = &s5p64x0_variant },
{},
};
+MODULE_DEVICE_TABLE(of, samsung_pwm_matches);
static int pwm_samsung_parse_dt(struct samsung_pwm_chip *chip)
{
diff --git a/kernel/drivers/pwm/pwm-sun4i.c b/kernel/drivers/pwm/pwm-sun4i.c
index cd9dde563..67af9f623 100644
--- a/kernel/drivers/pwm/pwm-sun4i.c
+++ b/kernel/drivers/pwm/pwm-sun4i.c
@@ -68,6 +68,7 @@ static const u32 prescaler_table[] = {
struct sun4i_pwm_data {
bool has_prescaler_bypass;
bool has_rdy;
+ unsigned int npwm;
};
struct sun4i_pwm_chip {
@@ -114,7 +115,7 @@ static int sun4i_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
* is not an integer so round it half up instead of
* truncating to get less surprising values.
*/
- div = clk_rate * period_ns + NSEC_PER_SEC/2;
+ div = clk_rate * period_ns + NSEC_PER_SEC / 2;
do_div(div, NSEC_PER_SEC);
if (div - 1 > PWM_PRD_MASK)
prescaler = 0;
@@ -262,11 +263,25 @@ static const struct pwm_ops sun4i_pwm_ops = {
static const struct sun4i_pwm_data sun4i_pwm_data_a10 = {
.has_prescaler_bypass = false,
.has_rdy = false,
+ .npwm = 2,
+};
+
+static const struct sun4i_pwm_data sun4i_pwm_data_a10s = {
+ .has_prescaler_bypass = true,
+ .has_rdy = true,
+ .npwm = 2,
+};
+
+static const struct sun4i_pwm_data sun4i_pwm_data_a13 = {
+ .has_prescaler_bypass = true,
+ .has_rdy = true,
+ .npwm = 1,
};
static const struct sun4i_pwm_data sun4i_pwm_data_a20 = {
.has_prescaler_bypass = true,
.has_rdy = true,
+ .npwm = 2,
};
static const struct of_device_id sun4i_pwm_dt_ids[] = {
@@ -274,6 +289,12 @@ static const struct of_device_id sun4i_pwm_dt_ids[] = {
.compatible = "allwinner,sun4i-a10-pwm",
.data = &sun4i_pwm_data_a10,
}, {
+ .compatible = "allwinner,sun5i-a10s-pwm",
+ .data = &sun4i_pwm_data_a10s,
+ }, {
+ .compatible = "allwinner,sun5i-a13-pwm",
+ .data = &sun4i_pwm_data_a13,
+ }, {
.compatible = "allwinner,sun7i-a20-pwm",
.data = &sun4i_pwm_data_a20,
}, {
@@ -305,14 +326,14 @@ static int sun4i_pwm_probe(struct platform_device *pdev)
if (IS_ERR(pwm->clk))
return PTR_ERR(pwm->clk);
+ pwm->data = match->data;
pwm->chip.dev = &pdev->dev;
pwm->chip.ops = &sun4i_pwm_ops;
pwm->chip.base = -1;
- pwm->chip.npwm = 2;
+ pwm->chip.npwm = pwm->data->npwm;
pwm->chip.can_sleep = true;
pwm->chip.of_xlate = of_pwm_xlate_with_flags;
pwm->chip.of_pwm_n_cells = 3;
- pwm->data = match->data;
spin_lock_init(&pwm->ctrl_lock);
diff --git a/kernel/drivers/pwm/pwm-tegra.c b/kernel/drivers/pwm/pwm-tegra.c
index cabd7d8e0..d4de0607b 100644
--- a/kernel/drivers/pwm/pwm-tegra.c
+++ b/kernel/drivers/pwm/pwm-tegra.c
@@ -112,7 +112,7 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
* If the PWM channel is disabled, make sure to turn on the clock
* before writing the register. Otherwise, keep it enabled.
*/
- if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (!pwm_is_enabled(pwm)) {
err = clk_prepare_enable(pc->clk);
if (err < 0)
return err;
@@ -124,7 +124,7 @@ static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/*
* If the PWM is not enabled, turn the clock off again to save power.
*/
- if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ if (!pwm_is_enabled(pwm))
clk_disable_unprepare(pc->clk);
return 0;
@@ -214,7 +214,7 @@ static int tegra_pwm_remove(struct platform_device *pdev)
for (i = 0; i < NUM_PWM; i++) {
struct pwm_device *pwm = &pc->chip.pwms[i];
- if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ if (!pwm_is_enabled(pwm))
if (clk_prepare_enable(pc->clk) < 0)
continue;
diff --git a/kernel/drivers/pwm/pwm-tiecap.c b/kernel/drivers/pwm/pwm-tiecap.c
index e557befdf..616af764a 100644
--- a/kernel/drivers/pwm/pwm-tiecap.c
+++ b/kernel/drivers/pwm/pwm-tiecap.c
@@ -97,7 +97,7 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
writew(reg_val, pc->mmio_base + ECCTL2);
- if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (!pwm_is_enabled(pwm)) {
/* Update active registers if not running */
writel(duty_cycles, pc->mmio_base + CAP2);
writel(period_cycles, pc->mmio_base + CAP1);
@@ -111,7 +111,7 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
writel(period_cycles, pc->mmio_base + CAP3);
}
- if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (!pwm_is_enabled(pwm)) {
reg_val = readw(pc->mmio_base + ECCTL2);
/* Disable APWM mode to put APWM output Low */
reg_val &= ~ECCTL2_APWM_MODE;
@@ -179,7 +179,7 @@ static void ecap_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
- if (test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (pwm_is_enabled(pwm)) {
dev_warn(chip->dev, "Removing PWM device without disabling\n");
pm_runtime_put_sync(chip->dev);
}
@@ -306,7 +306,7 @@ static int ecap_pwm_suspend(struct device *dev)
ecap_pwm_save_context(pc);
/* Disable explicitly if PWM is running */
- if (test_bit(PWMF_ENABLED, &pwm->flags))
+ if (pwm_is_enabled(pwm))
pm_runtime_put_sync(dev);
return 0;
@@ -318,7 +318,7 @@ static int ecap_pwm_resume(struct device *dev)
struct pwm_device *pwm = pc->chip.pwms;
/* Enable explicitly if PWM was running */
- if (test_bit(PWMF_ENABLED, &pwm->flags))
+ if (pwm_is_enabled(pwm))
pm_runtime_get_sync(dev);
ecap_pwm_restore_context(pc);
diff --git a/kernel/drivers/pwm/pwm-tiehrpwm.c b/kernel/drivers/pwm/pwm-tiehrpwm.c
index 694b3cf76..6a41e6601 100644
--- a/kernel/drivers/pwm/pwm-tiehrpwm.c
+++ b/kernel/drivers/pwm/pwm-tiehrpwm.c
@@ -407,7 +407,7 @@ static void ehrpwm_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct ehrpwm_pwm_chip *pc = to_ehrpwm_pwm_chip(chip);
- if (test_bit(PWMF_ENABLED, &pwm->flags)) {
+ if (pwm_is_enabled(pwm)) {
dev_warn(chip->dev, "Removing PWM device without disabling\n");
pm_runtime_put_sync(chip->dev);
}
@@ -565,7 +565,7 @@ static int ehrpwm_pwm_suspend(struct device *dev)
for (i = 0; i < pc->chip.npwm; i++) {
struct pwm_device *pwm = &pc->chip.pwms[i];
- if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ if (!pwm_is_enabled(pwm))
continue;
/* Disable explicitly if PWM is running */
@@ -582,7 +582,7 @@ static int ehrpwm_pwm_resume(struct device *dev)
for (i = 0; i < pc->chip.npwm; i++) {
struct pwm_device *pwm = &pc->chip.pwms[i];
- if (!test_bit(PWMF_ENABLED, &pwm->flags))
+ if (!pwm_is_enabled(pwm))
continue;
/* Enable explicitly if PWM was running */
diff --git a/kernel/drivers/pwm/sysfs.c b/kernel/drivers/pwm/sysfs.c
index 4bd0c639e..9c90886f4 100644
--- a/kernel/drivers/pwm/sysfs.c
+++ b/kernel/drivers/pwm/sysfs.c
@@ -40,18 +40,18 @@ static struct pwm_device *child_to_pwm_device(struct device *child)
return export->pwm;
}
-static ssize_t pwm_period_show(struct device *child,
- struct device_attribute *attr,
- char *buf)
+static ssize_t period_show(struct device *child,
+ struct device_attribute *attr,
+ char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
- return sprintf(buf, "%u\n", pwm->period);
+ return sprintf(buf, "%u\n", pwm_get_period(pwm));
}
-static ssize_t pwm_period_store(struct device *child,
- struct device_attribute *attr,
- const char *buf, size_t size)
+static ssize_t period_store(struct device *child,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
unsigned int val;
@@ -61,23 +61,23 @@ static ssize_t pwm_period_store(struct device *child,
if (ret)
return ret;
- ret = pwm_config(pwm, pwm->duty_cycle, val);
+ ret = pwm_config(pwm, pwm_get_duty_cycle(pwm), val);
return ret ? : size;
}
-static ssize_t pwm_duty_cycle_show(struct device *child,
- struct device_attribute *attr,
- char *buf)
+static ssize_t duty_cycle_show(struct device *child,
+ struct device_attribute *attr,
+ char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
- return sprintf(buf, "%u\n", pwm->duty_cycle);
+ return sprintf(buf, "%u\n", pwm_get_duty_cycle(pwm));
}
-static ssize_t pwm_duty_cycle_store(struct device *child,
- struct device_attribute *attr,
- const char *buf, size_t size)
+static ssize_t duty_cycle_store(struct device *child,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
unsigned int val;
@@ -87,24 +87,23 @@ static ssize_t pwm_duty_cycle_store(struct device *child,
if (ret)
return ret;
- ret = pwm_config(pwm, val, pwm->period);
+ ret = pwm_config(pwm, val, pwm_get_period(pwm));
return ret ? : size;
}
-static ssize_t pwm_enable_show(struct device *child,
- struct device_attribute *attr,
- char *buf)
+static ssize_t enable_show(struct device *child,
+ struct device_attribute *attr,
+ char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
- int enabled = test_bit(PWMF_ENABLED, &pwm->flags);
- return sprintf(buf, "%d\n", enabled);
+ return sprintf(buf, "%d\n", pwm_is_enabled(pwm));
}
-static ssize_t pwm_enable_store(struct device *child,
- struct device_attribute *attr,
- const char *buf, size_t size)
+static ssize_t enable_store(struct device *child,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
int val, ret;
@@ -128,18 +127,29 @@ static ssize_t pwm_enable_store(struct device *child,
return ret ? : size;
}
-static ssize_t pwm_polarity_show(struct device *child,
- struct device_attribute *attr,
- char *buf)
+static ssize_t polarity_show(struct device *child,
+ struct device_attribute *attr,
+ char *buf)
{
const struct pwm_device *pwm = child_to_pwm_device(child);
+ const char *polarity = "unknown";
+
+ switch (pwm_get_polarity(pwm)) {
+ case PWM_POLARITY_NORMAL:
+ polarity = "normal";
+ break;
- return sprintf(buf, "%s\n", pwm->polarity ? "inversed" : "normal");
+ case PWM_POLARITY_INVERSED:
+ polarity = "inversed";
+ break;
+ }
+
+ return sprintf(buf, "%s\n", polarity);
}
-static ssize_t pwm_polarity_store(struct device *child,
- struct device_attribute *attr,
- const char *buf, size_t size)
+static ssize_t polarity_store(struct device *child,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
{
struct pwm_device *pwm = child_to_pwm_device(child);
enum pwm_polarity polarity;
@@ -157,10 +167,10 @@ static ssize_t pwm_polarity_store(struct device *child,
return ret ? : size;
}
-static DEVICE_ATTR(period, 0644, pwm_period_show, pwm_period_store);
-static DEVICE_ATTR(duty_cycle, 0644, pwm_duty_cycle_show, pwm_duty_cycle_store);
-static DEVICE_ATTR(enable, 0644, pwm_enable_show, pwm_enable_store);
-static DEVICE_ATTR(polarity, 0644, pwm_polarity_show, pwm_polarity_store);
+static DEVICE_ATTR_RW(period);
+static DEVICE_ATTR_RW(duty_cycle);
+static DEVICE_ATTR_RW(enable);
+static DEVICE_ATTR_RW(polarity);
static struct attribute *pwm_attrs[] = {
&dev_attr_period.attr,
@@ -234,9 +244,9 @@ static int pwm_unexport_child(struct device *parent, struct pwm_device *pwm)
return 0;
}
-static ssize_t pwm_export_store(struct device *parent,
- struct device_attribute *attr,
- const char *buf, size_t len)
+static ssize_t export_store(struct device *parent,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
{
struct pwm_chip *chip = dev_get_drvdata(parent);
struct pwm_device *pwm;
@@ -260,11 +270,11 @@ static ssize_t pwm_export_store(struct device *parent,
return ret ? : len;
}
-static DEVICE_ATTR(export, 0200, NULL, pwm_export_store);
+static DEVICE_ATTR_WO(export);
-static ssize_t pwm_unexport_store(struct device *parent,
- struct device_attribute *attr,
- const char *buf, size_t len)
+static ssize_t unexport_store(struct device *parent,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
{
struct pwm_chip *chip = dev_get_drvdata(parent);
unsigned int hwpwm;
@@ -281,7 +291,7 @@ static ssize_t pwm_unexport_store(struct device *parent,
return ret ? : len;
}
-static DEVICE_ATTR(unexport, 0200, NULL, pwm_unexport_store);
+static DEVICE_ATTR_WO(unexport);
static ssize_t npwm_show(struct device *parent, struct device_attribute *attr,
char *buf)
@@ -301,9 +311,9 @@ static struct attribute *pwm_chip_attrs[] = {
ATTRIBUTE_GROUPS(pwm_chip);
static struct class pwm_class = {
- .name = "pwm",
- .owner = THIS_MODULE,
- .dev_groups = pwm_chip_groups,
+ .name = "pwm",
+ .owner = THIS_MODULE,
+ .dev_groups = pwm_chip_groups,
};
static int pwmchip_sysfs_match(struct device *parent, const void *data)