/* * 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/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/sysdev.h> #include <mach/hardware.h> #include <mach/pxa-regs.h> #include <mach/pxa2xx-regs.h> #include <mach/mfp-pxa2xx.h> #include "generic.h" #define gpio_to_bank(gpio) ((gpio) >> 5) #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 PWER_WE35 (1 << 24) struct gpio_desc { unsigned valid : 1; unsigned can_wakeup : 1; unsigned keypad_gpio : 1; unsigned int mask; /* bit mask in PWER or PKWR */ unsigned long config; }; static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1]; static int gpio_nr; 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 dir = c & MFP_DIR_OUT; 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 (dir == MFP_DIR_OUT) 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; dir = MFP_DIR_OUT; break; case MFP_LPM_DRIVE_LOW: PGSR(bank) &= ~mask; dir = MFP_DIR_OUT; break; case MFP_LPM_DEFAULT: break; default: /* warning and fall through, treat as MFP_LPM_DEFAULT */ pr_warning("%s: GPIO%d: unsupported low power mode\n", __func__, gpio); break; } if (dir == MFP_DIR_OUT) 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_warning("%s: GPIO%d unable to wakeup\n", __func__, gpio); return -EINVAL; } if ((c & MFP_LPM_CAN_WAKEUP) && (dir == MFP_DIR_OUT)) { pr_warning("%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_warning("%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; if (gpio > mfp_to_gpio(MFP_PIN_GPIO127)) return -EINVAL; d = &gpio_desc[gpio]; c = d->config; if (!d->valid) return -EINVAL; if (d->keypad_gpio) return -EINVAL; if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) { if (on) { PWER |= 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; for (i = 0; i <= 84; 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); } gpio_nr = 85; } #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; if (!on) { PKWR = 0; return 0; } for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) { gpio = pxa27x_pkwr_gpio[i]; if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP) mask |= gpio_desc[gpio].mask; } PKWR = mask; return 0; } static void __init pxa27x_mfp_init(void) { int i, gpio; for (i = 0; i <= 120; 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; gpio_nr = 121; } #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 int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state) { int i; for (i = 0; i <= gpio_to_bank(gpio_nr); i++) { saved_gafr[0][i] = GAFR_L(i); saved_gafr[1][i] = GAFR_U(i); saved_gpdr[i] = GPDR(i * 32); GPDR(i * 32) = gpdr_lpm[i]; } return 0; } static int pxa2xx_mfp_resume(struct sys_device *d) { int i; for (i = 0; i <= gpio_to_bank(gpio_nr); i++) { GAFR_L(i) = saved_gafr[0][i]; GAFR_U(i) = saved_gafr[1][i]; GPDR(i * 32) = saved_gpdr[i]; } PSSR = PSSR_RDH | PSSR_PH; return 0; } #else #define pxa2xx_mfp_suspend NULL #define pxa2xx_mfp_resume NULL #endif struct sysdev_class pxa2xx_mfp_sysclass = { .name = "mfp", .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(); /* initialize gafr_run[], pgsr_lpm[] from existing values */ for (i = 0; i <= gpio_to_bank(gpio_nr); i++) gpdr_lpm[i] = GPDR(i * 32); return sysdev_class_register(&pxa2xx_mfp_sysclass); } postcore_initcall(pxa2xx_mfp_init);