390 lines
8.3 KiB
C
390 lines
8.3 KiB
C
/*
|
|
* 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/gpio.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 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_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 (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_warning("%s: GPIO%d unable to wakeup\n",
|
|
__func__, gpio);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((c & MFP_LPM_CAN_WAKEUP) && is_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, mux_taken;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
#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;
|
|
|
|
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_pgsr[4];
|
|
|
|
static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
|
|
{
|
|
int 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_pgsr[i] = PGSR(i);
|
|
|
|
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(pxa_last_gpio); i++) {
|
|
GAFR_L(i) = saved_gafr[0][i];
|
|
GAFR_U(i) = saved_gafr[1][i];
|
|
GPDR(i * 32) = saved_gpdr[i];
|
|
PGSR(i) = saved_pgsr[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();
|
|
|
|
/* 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 sysdev_class_register(&pxa2xx_mfp_sysclass);
|
|
}
|
|
postcore_initcall(pxa2xx_mfp_init);
|