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linux-2.6/arch/arm/mach-pxa/mfp-pxa2xx.c
Eric Miao 067455aa53 [ARM] pxa: add support for additional GPIOs on PXA26x 
Original patch from Marek Vasut, the problems with PXA26x are:

1. there are additional 4 GPIOs 86,87,88,89 have their direction bits
   inverted in GPDR2, as well as their alternate function bits being
   '1' for their GPIO functionality in GAFRx

2. there is no easy way to decide if the processor is a pxa26x or a
   pxa250/pxa255 at run-time, so the assumption here is the pxa26x
   will be treated as one of the pxa25x variants, and board code
   should have a better knowledge of the processor it is featured

Introduce pxa26x_init_irq() for the second purpose, and treat the
additional GPIOs > 85 on PXA25x specially.

Kconfig option CONFIG_CPU_PXA26x is introduced to optimize the code
a bit when PXA26x support isn't needed. Board config options have
to select this to enable the support for PXA26x.

__gpio_is_inverted() will be optimized way when CONFIG_CPU_PXA26x
isn't selected.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
2008-12-02 14:42:37 +08:00

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/*
* 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 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 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);
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];
}
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(pxa_last_gpio); i++)
gpdr_lpm[i] = GPDR(i * 32);
return sysdev_class_register(&pxa2xx_mfp_sysclass);
}
postcore_initcall(pxa2xx_mfp_init);
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