/*
* 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 <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/mfp-pxa2xx.h>
#include "generic.h"
#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3)
#define PWER_WE35 (1 << 24)
static struct {
unsigned valid : 1;
unsigned can_wakeup : 1;
unsigned keypad_gpio : 1;
unsigned int mask; /* bit mask in PWER or PKWR */
unsigned long config;
} gpio_desc[MFP_PIN_GPIO127 + 1];
static inline int __mfp_config_gpio(unsigned gpio, unsigned long c)
{
unsigned long gafr, mask = GPIO_bit(gpio);
int fn;
fn = MFP_AF(c);
if (fn > 3)
return -EINVAL;
/* alternate function and direction */
gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2));
if (c & MFP_DIR_OUT)
GPDR(gpio) |= mask;
else
GPDR(gpio) &= ~mask;
/* low power state */
switch (c & MFP_LPM_STATE_MASK) {
case MFP_LPM_DRIVE_HIGH:
PGSR(gpio) |= mask;
break;
case MFP_LPM_DRIVE_LOW:
PGSR(gpio) &= ~mask;
break;
case MFP_LPM_INPUT:
break;
default:
pr_warning("%s: invalid low power state for GPIO%d\n",
__func__, gpio);
return -EINVAL;
}
/* wakeup enabling */
if ((c & MFP_LPM_WAKEUP_ENABLE) == 0)
return 0;
if (!gpio_desc[gpio].can_wakeup || c & MFP_DIR_OUT) {
pr_warning("%s: GPIO%d unable to wakeup\n",
__func__, gpio);
return -EINVAL;
}
if (gpio_desc[gpio].keypad_gpio)
PKWR |= gpio_desc[gpio].mask;
else {
PWER |= gpio_desc[gpio].mask;
if (c & MFP_LPM_EDGE_RISE)
PRER |= gpio_desc[gpio].mask;
if (c & MFP_LPM_EDGE_FALL)
PFER |= gpio_desc[gpio].mask;
}
return 0;
}
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_to_gpio(MFP_PIN(*c));
if (!gpio_desc[gpio].valid) {
pr_warning("%s: GPIO%d is invalid pin\n",
__func__, gpio);
continue;
}
local_irq_save(flags);
gpio_desc[gpio].config = *c;
__mfp_config_gpio(gpio, *c);
local_irq_restore(flags);
}
}
#ifdef CONFIG_PXA25x
static int __init pxa25x_mfp_init(void)
{
int i;
if (cpu_is_pxa25x()) {
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);
}
}
return 0;
}
postcore_initcall(pxa25x_mfp_init);
#endif /* CONFIG_PXA25x */
#ifdef CONFIG_PXA27x
static int pxa27x_pkwr_gpio[] __initdata = {
13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
95, 96, 97, 98, 99, 100, 101, 102
};
static int __init pxa27x_mfp_init(void)
{
int i, gpio;
if (cpu_is_pxa27x()) {
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;
}
return 0;
}
postcore_initcall(pxa27x_mfp_init);
#endif /* CONFIG_PXA27x */
