diff options
Diffstat (limited to 'kernel/arch/arm/mach-pxa/mfp-pxa2xx.c')
-rw-r--r-- | kernel/arch/arm/mach-pxa/mfp-pxa2xx.c | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-pxa/mfp-pxa2xx.c b/kernel/arch/arm/mach-pxa/mfp-pxa2xx.c new file mode 100644 index 000000000..666b78972 --- /dev/null +++ b/kernel/arch/arm/mach-pxa/mfp-pxa2xx.c @@ -0,0 +1,439 @@ +/* + * linux/arch/arm/mach-pxa/mfp-pxa2xx.c + * + * PXA2xx pin mux configuration support + * + * The GPIOs on PXA2xx can be configured as one of many alternate + * functions, this is by concept samilar to the MFP configuration + * on PXA3xx, what's more important, the low power pin state and + * wakeup detection are also supported by the same framework. + * + * 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. + */ +#include <linux/gpio.h> +#include <linux/gpio-pxa.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/syscore_ops.h> + +#include <mach/pxa2xx-regs.h> +#include <mach/mfp-pxa2xx.h> + +#include "generic.h" + +#define PGSR(x) __REG2(0x40F00020, (x) << 2) +#define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3) +#define GAFR_L(x) __GAFR(0, x) +#define GAFR_U(x) __GAFR(1, x) + +#define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2)) +#define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5)) +#define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c) +#define GPSR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18) +#define GPCR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24) + +#define PWER_WE35 (1 << 24) + +struct gpio_desc { + unsigned valid : 1; + unsigned can_wakeup : 1; + unsigned keypad_gpio : 1; + unsigned dir_inverted : 1; + unsigned int mask; /* bit mask in PWER or PKWR */ + unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */ + unsigned long config; +}; + +static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; + +static unsigned long gpdr_lpm[4]; + +static int __mfp_config_gpio(unsigned gpio, unsigned long c) +{ + unsigned long gafr, mask = GPIO_bit(gpio); + int bank = gpio_to_bank(gpio); + int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */ + int shft = (gpio & 0xf) << 1; + int fn = MFP_AF(c); + int is_out = (c & MFP_DIR_OUT) ? 1 : 0; + + if (fn > 3) + return -EINVAL; + + /* alternate function and direction at run-time */ + gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank); + gafr = (gafr & ~(0x3 << shft)) | (fn << shft); + + if (uorl == 0) + GAFR_L(bank) = gafr; + else + GAFR_U(bank) = gafr; + + if (is_out ^ gpio_desc[gpio].dir_inverted) + GPDR(gpio) |= mask; + else + GPDR(gpio) &= ~mask; + + /* alternate function and direction at low power mode */ + switch (c & MFP_LPM_STATE_MASK) { + case MFP_LPM_DRIVE_HIGH: + PGSR(bank) |= mask; + is_out = 1; + break; + case MFP_LPM_DRIVE_LOW: + PGSR(bank) &= ~mask; + is_out = 1; + break; + case MFP_LPM_INPUT: + case MFP_LPM_DEFAULT: + break; + default: + /* warning and fall through, treat as MFP_LPM_DEFAULT */ + pr_warn("%s: GPIO%d: unsupported low power mode\n", + __func__, gpio); + break; + } + + if (is_out ^ gpio_desc[gpio].dir_inverted) + gpdr_lpm[bank] |= mask; + else + gpdr_lpm[bank] &= ~mask; + + /* give early warning if MFP_LPM_CAN_WAKEUP is set on the + * configurations of those pins not able to wakeup + */ + if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) { + pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio); + return -EINVAL; + } + + if ((c & MFP_LPM_CAN_WAKEUP) && is_out) { + pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio); + return -EINVAL; + } + + return 0; +} + +static inline int __mfp_validate(int mfp) +{ + int gpio = mfp_to_gpio(mfp); + + if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) { + pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio); + return -1; + } + + return gpio; +} + +void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num) +{ + unsigned long flags; + unsigned long *c; + int i, gpio; + + for (i = 0, c = mfp_cfgs; i < num; i++, c++) { + + gpio = __mfp_validate(MFP_PIN(*c)); + if (gpio < 0) + continue; + + local_irq_save(flags); + + gpio_desc[gpio].config = *c; + __mfp_config_gpio(gpio, *c); + + local_irq_restore(flags); + } +} + +void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm) +{ + unsigned long flags, c; + int gpio; + + gpio = __mfp_validate(mfp); + if (gpio < 0) + return; + + local_irq_save(flags); + + c = gpio_desc[gpio].config; + c = (c & ~MFP_LPM_STATE_MASK) | lpm; + __mfp_config_gpio(gpio, c); + + local_irq_restore(flags); +} + +int gpio_set_wake(unsigned int gpio, unsigned int on) +{ + struct gpio_desc *d; + unsigned long c, mux_taken; + + if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) + return -EINVAL; + + d = &gpio_desc[gpio]; + c = d->config; + + if (!d->valid) + return -EINVAL; + + /* Allow keypad GPIOs to wakeup system when + * configured as generic GPIOs. + */ + if (d->keypad_gpio && (MFP_AF(d->config) == 0) && + (d->config & MFP_LPM_CAN_WAKEUP)) { + if (on) + PKWR |= d->mask; + else + PKWR &= ~d->mask; + return 0; + } + + mux_taken = (PWER & d->mux_mask) & (~d->mask); + if (on && mux_taken) + return -EBUSY; + + if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { + if (on) { + PWER = (PWER & ~d->mux_mask) | d->mask; + + if (c & MFP_LPM_EDGE_RISE) + PRER |= d->mask; + else + PRER &= ~d->mask; + + if (c & MFP_LPM_EDGE_FALL) + PFER |= d->mask; + else + PFER &= ~d->mask; + } else { + PWER &= ~d->mask; + PRER &= ~d->mask; + PFER &= ~d->mask; + } + } + return 0; +} + +#ifdef CONFIG_PXA25x +static void __init pxa25x_mfp_init(void) +{ + int i; + + /* running before pxa_gpio_probe() */ +#ifdef CONFIG_CPU_PXA26x + pxa_last_gpio = 89; +#else + pxa_last_gpio = 84; +#endif + for (i = 0; i <= pxa_last_gpio; i++) + gpio_desc[i].valid = 1; + + for (i = 0; i <= 15; i++) { + gpio_desc[i].can_wakeup = 1; + gpio_desc[i].mask = GPIO_bit(i); + } + + /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the + * direction bit inverted in GPDR2. See PXA26x DM 4.1.1. + */ + for (i = 86; i <= pxa_last_gpio; i++) + gpio_desc[i].dir_inverted = 1; +} +#else +static inline void pxa25x_mfp_init(void) {} +#endif /* CONFIG_PXA25x */ + +#ifdef CONFIG_PXA27x +static int pxa27x_pkwr_gpio[] = { + 13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94, + 95, 96, 97, 98, 99, 100, 101, 102 +}; + +int keypad_set_wake(unsigned int on) +{ + unsigned int i, gpio, mask = 0; + struct gpio_desc *d; + + for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { + + gpio = pxa27x_pkwr_gpio[i]; + d = &gpio_desc[gpio]; + + /* skip if configured as generic GPIO */ + if (MFP_AF(d->config) == 0) + continue; + + if (d->config & MFP_LPM_CAN_WAKEUP) + mask |= gpio_desc[gpio].mask; + } + + if (on) + PKWR |= mask; + else + PKWR &= ~mask; + return 0; +} + +#define PWER_WEMUX2_GPIO38 (1 << 16) +#define PWER_WEMUX2_GPIO53 (2 << 16) +#define PWER_WEMUX2_GPIO40 (3 << 16) +#define PWER_WEMUX2_GPIO36 (4 << 16) +#define PWER_WEMUX2_MASK (7 << 16) +#define PWER_WEMUX3_GPIO31 (1 << 19) +#define PWER_WEMUX3_GPIO113 (2 << 19) +#define PWER_WEMUX3_MASK (3 << 19) + +#define INIT_GPIO_DESC_MUXED(mux, gpio) \ +do { \ + gpio_desc[(gpio)].can_wakeup = 1; \ + gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \ + gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \ +} while (0) + +static void __init pxa27x_mfp_init(void) +{ + int i, gpio; + + pxa_last_gpio = 120; /* running before pxa_gpio_probe() */ + for (i = 0; i <= pxa_last_gpio; i++) { + /* skip GPIO2, 5, 6, 7, 8, they are not + * valid pins allow configuration + */ + if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8) + continue; + + gpio_desc[i].valid = 1; + } + + /* Keypad GPIOs */ + for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { + gpio = pxa27x_pkwr_gpio[i]; + gpio_desc[gpio].can_wakeup = 1; + gpio_desc[gpio].keypad_gpio = 1; + gpio_desc[gpio].mask = 1 << i; + } + + /* Overwrite GPIO13 as a PWER wakeup source */ + for (i = 0; i <= 15; i++) { + /* skip GPIO2, 5, 6, 7, 8 */ + if (GPIO_bit(i) & 0x1e4) + continue; + + gpio_desc[i].can_wakeup = 1; + gpio_desc[i].mask = GPIO_bit(i); + } + + gpio_desc[35].can_wakeup = 1; + gpio_desc[35].mask = PWER_WE35; + + INIT_GPIO_DESC_MUXED(WEMUX3, 31); + INIT_GPIO_DESC_MUXED(WEMUX3, 113); + INIT_GPIO_DESC_MUXED(WEMUX2, 38); + INIT_GPIO_DESC_MUXED(WEMUX2, 53); + INIT_GPIO_DESC_MUXED(WEMUX2, 40); + INIT_GPIO_DESC_MUXED(WEMUX2, 36); +} +#else +static inline void pxa27x_mfp_init(void) {} +#endif /* CONFIG_PXA27x */ + +#ifdef CONFIG_PM +static unsigned long saved_gafr[2][4]; +static unsigned long saved_gpdr[4]; +static unsigned long saved_gplr[4]; +static unsigned long saved_pgsr[4]; + +static int pxa2xx_mfp_suspend(void) +{ + int i; + + /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */ + for (i = 0; i < pxa_last_gpio; i++) { + if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && + (GPDR(i) & GPIO_bit(i))) { + if (GPLR(i) & GPIO_bit(i)) + PGSR(gpio_to_bank(i)) |= GPIO_bit(i); + else + PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i); + } + } + + for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { + saved_gafr[0][i] = GAFR_L(i); + saved_gafr[1][i] = GAFR_U(i); + saved_gpdr[i] = GPDR(i * 32); + saved_gplr[i] = GPLR(i * 32); + saved_pgsr[i] = PGSR(i); + + GPSR(i * 32) = PGSR(i); + GPCR(i * 32) = ~PGSR(i); + } + + /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */ + for (i = 0; i < pxa_last_gpio; i++) { + if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) || + ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) && + (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i)))) + GPDR(i) |= GPIO_bit(i); + else + GPDR(i) &= ~GPIO_bit(i); + } + + return 0; +} + +static void pxa2xx_mfp_resume(void) +{ + int i; + + for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) { + GAFR_L(i) = saved_gafr[0][i]; + GAFR_U(i) = saved_gafr[1][i]; + GPSR(i * 32) = saved_gplr[i]; + GPCR(i * 32) = ~saved_gplr[i]; + GPDR(i * 32) = saved_gpdr[i]; + PGSR(i) = saved_pgsr[i]; + } + PSSR = PSSR_RDH | PSSR_PH; +} +#else +#define pxa2xx_mfp_suspend NULL +#define pxa2xx_mfp_resume NULL +#endif + +struct syscore_ops pxa2xx_mfp_syscore_ops = { + .suspend = pxa2xx_mfp_suspend, + .resume = pxa2xx_mfp_resume, +}; + +static int __init pxa2xx_mfp_init(void) +{ + int i; + + if (!cpu_is_pxa2xx()) + return 0; + + if (cpu_is_pxa25x()) + pxa25x_mfp_init(); + + if (cpu_is_pxa27x()) + pxa27x_mfp_init(); + + /* clear RDH bit to enable GPIO receivers after reset/sleep exit */ + PSSR = PSSR_RDH; + + /* initialize gafr_run[], pgsr_lpm[] from existing values */ + for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) + gpdr_lpm[i] = GPDR(i * 32); + + return 0; +} +postcore_initcall(pxa2xx_mfp_init); |