diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/pwm/pwm-img.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/pwm/pwm-img.c')
-rw-r--r-- | kernel/drivers/pwm/pwm-img.c | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/kernel/drivers/pwm/pwm-img.c b/kernel/drivers/pwm/pwm-img.c new file mode 100644 index 000000000..8a029f9bc --- /dev/null +++ b/kernel/drivers/pwm/pwm-img.c @@ -0,0 +1,301 @@ +/* + * Imagination Technologies Pulse Width Modulator driver + * + * Copyright (c) 2014-2015, Imagination Technologies + * + * Based on drivers/pwm/pwm-tegra.c, Copyright (c) 2010, NVIDIA 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. + */ + +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pwm.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +/* PWM registers */ +#define PWM_CTRL_CFG 0x0000 +#define PWM_CTRL_CFG_NO_SUB_DIV 0 +#define PWM_CTRL_CFG_SUB_DIV0 1 +#define PWM_CTRL_CFG_SUB_DIV1 2 +#define PWM_CTRL_CFG_SUB_DIV0_DIV1 3 +#define PWM_CTRL_CFG_DIV_SHIFT(ch) ((ch) * 2 + 4) +#define PWM_CTRL_CFG_DIV_MASK 0x3 + +#define PWM_CH_CFG(ch) (0x4 + (ch) * 4) +#define PWM_CH_CFG_TMBASE_SHIFT 0 +#define PWM_CH_CFG_DUTY_SHIFT 16 + +#define PERIP_PWM_PDM_CONTROL 0x0140 +#define PERIP_PWM_PDM_CONTROL_CH_MASK 0x1 +#define PERIP_PWM_PDM_CONTROL_CH_SHIFT(ch) ((ch) * 4) + +/* + * PWM period is specified with a timebase register, + * in number of step periods. The PWM duty cycle is also + * specified in step periods, in the [0, $timebase] range. + * In other words, the timebase imposes the duty cycle + * resolution. Therefore, let's constraint the timebase to + * a minimum value to allow a sane range of duty cycle values. + * Imposing a minimum timebase, will impose a maximum PWM frequency. + * + * The value chosen is completely arbitrary. + */ +#define MIN_TMBASE_STEPS 16 + +struct img_pwm_soc_data { + u32 max_timebase; +}; + +struct img_pwm_chip { + struct device *dev; + struct pwm_chip chip; + struct clk *pwm_clk; + struct clk *sys_clk; + void __iomem *base; + struct regmap *periph_regs; + int max_period_ns; + int min_period_ns; + const struct img_pwm_soc_data *data; +}; + +static inline struct img_pwm_chip *to_img_pwm_chip(struct pwm_chip *chip) +{ + return container_of(chip, struct img_pwm_chip, chip); +} + +static inline void img_pwm_writel(struct img_pwm_chip *chip, + u32 reg, u32 val) +{ + writel(val, chip->base + reg); +} + +static inline u32 img_pwm_readl(struct img_pwm_chip *chip, + u32 reg) +{ + return readl(chip->base + reg); +} + +static int img_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, + int duty_ns, int period_ns) +{ + u32 val, div, duty, timebase; + unsigned long mul, output_clk_hz, input_clk_hz; + struct img_pwm_chip *pwm_chip = to_img_pwm_chip(chip); + unsigned int max_timebase = pwm_chip->data->max_timebase; + + if (period_ns < pwm_chip->min_period_ns || + period_ns > pwm_chip->max_period_ns) { + dev_err(chip->dev, "configured period not in range\n"); + return -ERANGE; + } + + input_clk_hz = clk_get_rate(pwm_chip->pwm_clk); + output_clk_hz = DIV_ROUND_UP(NSEC_PER_SEC, period_ns); + + mul = DIV_ROUND_UP(input_clk_hz, output_clk_hz); + if (mul <= max_timebase) { + div = PWM_CTRL_CFG_NO_SUB_DIV; + timebase = DIV_ROUND_UP(mul, 1); + } else if (mul <= max_timebase * 8) { + div = PWM_CTRL_CFG_SUB_DIV0; + timebase = DIV_ROUND_UP(mul, 8); + } else if (mul <= max_timebase * 64) { + div = PWM_CTRL_CFG_SUB_DIV1; + timebase = DIV_ROUND_UP(mul, 64); + } else if (mul <= max_timebase * 512) { + div = PWM_CTRL_CFG_SUB_DIV0_DIV1; + timebase = DIV_ROUND_UP(mul, 512); + } else if (mul > max_timebase * 512) { + dev_err(chip->dev, + "failed to configure timebase steps/divider value\n"); + return -EINVAL; + } + + duty = DIV_ROUND_UP(timebase * duty_ns, period_ns); + + val = img_pwm_readl(pwm_chip, PWM_CTRL_CFG); + val &= ~(PWM_CTRL_CFG_DIV_MASK << PWM_CTRL_CFG_DIV_SHIFT(pwm->hwpwm)); + val |= (div & PWM_CTRL_CFG_DIV_MASK) << + PWM_CTRL_CFG_DIV_SHIFT(pwm->hwpwm); + img_pwm_writel(pwm_chip, PWM_CTRL_CFG, val); + + val = (duty << PWM_CH_CFG_DUTY_SHIFT) | + (timebase << PWM_CH_CFG_TMBASE_SHIFT); + img_pwm_writel(pwm_chip, PWM_CH_CFG(pwm->hwpwm), val); + + return 0; +} + +static int img_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + u32 val; + struct img_pwm_chip *pwm_chip = to_img_pwm_chip(chip); + + val = img_pwm_readl(pwm_chip, PWM_CTRL_CFG); + val |= BIT(pwm->hwpwm); + img_pwm_writel(pwm_chip, PWM_CTRL_CFG, val); + + regmap_update_bits(pwm_chip->periph_regs, PERIP_PWM_PDM_CONTROL, + PERIP_PWM_PDM_CONTROL_CH_MASK << + PERIP_PWM_PDM_CONTROL_CH_SHIFT(pwm->hwpwm), 0); + + return 0; +} + +static void img_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) +{ + u32 val; + struct img_pwm_chip *pwm_chip = to_img_pwm_chip(chip); + + val = img_pwm_readl(pwm_chip, PWM_CTRL_CFG); + val &= ~BIT(pwm->hwpwm); + img_pwm_writel(pwm_chip, PWM_CTRL_CFG, val); +} + +static const struct pwm_ops img_pwm_ops = { + .config = img_pwm_config, + .enable = img_pwm_enable, + .disable = img_pwm_disable, + .owner = THIS_MODULE, +}; + +static const struct img_pwm_soc_data pistachio_pwm = { + .max_timebase = 255, +}; + +static const struct of_device_id img_pwm_of_match[] = { + { + .compatible = "img,pistachio-pwm", + .data = &pistachio_pwm, + }, + { } +}; +MODULE_DEVICE_TABLE(of, img_pwm_of_match); + +static int img_pwm_probe(struct platform_device *pdev) +{ + int ret; + u64 val; + unsigned long clk_rate; + struct resource *res; + struct img_pwm_chip *pwm; + const struct of_device_id *of_dev_id; + + pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); + if (!pwm) + return -ENOMEM; + + pwm->dev = &pdev->dev; + + 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); + + of_dev_id = of_match_device(img_pwm_of_match, &pdev->dev); + if (!of_dev_id) + return -ENODEV; + pwm->data = of_dev_id->data; + + pwm->periph_regs = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "img,cr-periph"); + if (IS_ERR(pwm->periph_regs)) + return PTR_ERR(pwm->periph_regs); + + pwm->sys_clk = devm_clk_get(&pdev->dev, "sys"); + if (IS_ERR(pwm->sys_clk)) { + dev_err(&pdev->dev, "failed to get system clock\n"); + return PTR_ERR(pwm->sys_clk); + } + + pwm->pwm_clk = devm_clk_get(&pdev->dev, "pwm"); + if (IS_ERR(pwm->pwm_clk)) { + dev_err(&pdev->dev, "failed to get pwm clock\n"); + return PTR_ERR(pwm->pwm_clk); + } + + ret = clk_prepare_enable(pwm->sys_clk); + if (ret < 0) { + dev_err(&pdev->dev, "could not prepare or enable sys clock\n"); + return ret; + } + + ret = clk_prepare_enable(pwm->pwm_clk); + if (ret < 0) { + dev_err(&pdev->dev, "could not prepare or enable pwm clock\n"); + goto disable_sysclk; + } + + clk_rate = clk_get_rate(pwm->pwm_clk); + + /* The maximum input clock divider is 512 */ + val = (u64)NSEC_PER_SEC * 512 * pwm->data->max_timebase; + do_div(val, clk_rate); + pwm->max_period_ns = val; + + val = (u64)NSEC_PER_SEC * MIN_TMBASE_STEPS; + do_div(val, clk_rate); + pwm->min_period_ns = val; + + pwm->chip.dev = &pdev->dev; + pwm->chip.ops = &img_pwm_ops; + pwm->chip.base = -1; + pwm->chip.npwm = 4; + + ret = pwmchip_add(&pwm->chip); + if (ret < 0) { + dev_err(&pdev->dev, "pwmchip_add failed: %d\n", ret); + goto disable_pwmclk; + } + + platform_set_drvdata(pdev, pwm); + return 0; + +disable_pwmclk: + clk_disable_unprepare(pwm->pwm_clk); +disable_sysclk: + clk_disable_unprepare(pwm->sys_clk); + return ret; +} + +static int img_pwm_remove(struct platform_device *pdev) +{ + struct img_pwm_chip *pwm_chip = platform_get_drvdata(pdev); + u32 val; + unsigned int i; + + for (i = 0; i < pwm_chip->chip.npwm; i++) { + val = img_pwm_readl(pwm_chip, PWM_CTRL_CFG); + val &= ~BIT(i); + img_pwm_writel(pwm_chip, PWM_CTRL_CFG, val); + } + + clk_disable_unprepare(pwm_chip->pwm_clk); + clk_disable_unprepare(pwm_chip->sys_clk); + + return pwmchip_remove(&pwm_chip->chip); +} + +static struct platform_driver img_pwm_driver = { + .driver = { + .name = "img-pwm", + .of_match_table = img_pwm_of_match, + }, + .probe = img_pwm_probe, + .remove = img_pwm_remove, +}; +module_platform_driver(img_pwm_driver); + +MODULE_AUTHOR("Sai Masarapu <Sai.Masarapu@imgtec.com>"); +MODULE_DESCRIPTION("Imagination Technologies PWM DAC driver"); +MODULE_LICENSE("GPL v2"); |