c0a596d6a1
Changes include:
1. rename MFP_LPM_WAKEUP_ENABLE into MFP_LPM_CAN_WAKEUP to indicate
the board capability of this pin to wakeup the system
2. add gpio_set_wake() and keypad_set_wake() to allow dynamically
enable/disable wakeup from GPIOs and keypad GPIO
* these functions are currently kept in mfp-pxa2xx.c due to their
dependency to the MFP configuration
3. pxa2xx_mfp_config() only gives early warning if MFP_LPM_CAN_WAKEUP
is set on incorrect pins
So that the GPIO's wakeup capability is now decided by the following:
a) processor's capability: (only those GPIOs which have dedicated
bits within PWER/PRER/PFER can wakeup the system), this is
initialized by pxa{25x,27x}_init_mfp()
b) board design decides:
- whether the pin is designed to wakeup the system (some of
the GPIOs are configured as other functions, which is not
intended to be a wakeup source), by OR'ing the pin config
with MFP_LPM_CAN_WAKEUP
- which edge the pin is designed to wakeup the system, this
may depends on external peripherals/connections, which is
totally board specific; this is indicated by MFP_LPM_EDGE_*
c) the corresponding device's (most likely the gpio_keys.c) wakeup
attribute:
Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
246 lines
4.8 KiB
C
246 lines
4.8 KiB
C
/*
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* linux/arch/arm/mach-pxa/mfp-pxa2xx.c
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*
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* PXA2xx pin mux configuration support
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*
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* The GPIOs on PXA2xx can be configured as one of many alternate
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* functions, this is by concept samilar to the MFP configuration
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* on PXA3xx, what's more important, the low power pin state and
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* wakeup detection are also supported by the same framework.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sysdev.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/pxa-regs.h>
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#include <asm/arch/mfp-pxa2xx.h>
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#include "generic.h"
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#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3)
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#define PWER_WE35 (1 << 24)
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struct gpio_desc {
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unsigned valid : 1;
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unsigned can_wakeup : 1;
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unsigned keypad_gpio : 1;
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unsigned int mask; /* bit mask in PWER or PKWR */
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unsigned long config;
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};
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static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
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static int __mfp_config_gpio(unsigned gpio, unsigned long c)
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{
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unsigned long gafr, mask = GPIO_bit(gpio);
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int fn;
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fn = MFP_AF(c);
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if (fn > 3)
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return -EINVAL;
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/* alternate function and direction */
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gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
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GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2));
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if (c & MFP_DIR_OUT)
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GPDR(gpio) |= mask;
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else
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GPDR(gpio) &= ~mask;
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/* low power state */
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switch (c & MFP_LPM_STATE_MASK) {
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case MFP_LPM_DRIVE_HIGH:
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PGSR(gpio) |= mask;
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break;
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case MFP_LPM_DRIVE_LOW:
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PGSR(gpio) &= ~mask;
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break;
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case MFP_LPM_INPUT:
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break;
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default:
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pr_warning("%s: invalid low power state for GPIO%d\n",
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__func__, gpio);
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return -EINVAL;
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}
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/* give early warning if MFP_LPM_CAN_WAKEUP is set on the
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* configurations of those pins not able to wakeup
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*/
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if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
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pr_warning("%s: GPIO%d unable to wakeup\n",
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__func__, gpio);
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return -EINVAL;
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}
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if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {
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pr_warning("%s: output GPIO%d unable to wakeup\n",
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__func__, gpio);
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return -EINVAL;
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}
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return 0;
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}
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void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
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{
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unsigned long flags;
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unsigned long *c;
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int i, gpio;
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for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
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gpio = mfp_to_gpio(MFP_PIN(*c));
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if (!gpio_desc[gpio].valid) {
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pr_warning("%s: GPIO%d is invalid pin\n",
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__func__, gpio);
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continue;
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}
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local_irq_save(flags);
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gpio_desc[gpio].config = *c;
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__mfp_config_gpio(gpio, *c);
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local_irq_restore(flags);
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}
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}
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int gpio_set_wake(unsigned int gpio, unsigned int on)
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{
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struct gpio_desc *d;
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unsigned long c;
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if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
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return -EINVAL;
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d = &gpio_desc[gpio];
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c = d->config;
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if (!d->valid)
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return -EINVAL;
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if (d->keypad_gpio)
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return -EINVAL;
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if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
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if (on) {
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PWER |= d->mask;
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if (c & MFP_LPM_EDGE_RISE)
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PRER |= d->mask;
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else
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PRER &= ~d->mask;
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if (c & MFP_LPM_EDGE_FALL)
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PFER |= d->mask;
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else
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PFER &= ~d->mask;
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} else {
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PWER &= ~d->mask;
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PRER &= ~d->mask;
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PFER &= ~d->mask;
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}
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}
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return 0;
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}
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#ifdef CONFIG_PXA25x
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static int __init pxa25x_mfp_init(void)
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{
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int i;
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if (cpu_is_pxa25x()) {
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for (i = 0; i <= 84; i++)
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gpio_desc[i].valid = 1;
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for (i = 0; i <= 15; i++) {
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gpio_desc[i].can_wakeup = 1;
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gpio_desc[i].mask = GPIO_bit(i);
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}
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}
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return 0;
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}
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postcore_initcall(pxa25x_mfp_init);
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#endif /* CONFIG_PXA25x */
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#ifdef CONFIG_PXA27x
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static int pxa27x_pkwr_gpio[] = {
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13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
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95, 96, 97, 98, 99, 100, 101, 102
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};
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int keypad_set_wake(unsigned int on)
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{
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unsigned int i, gpio, mask = 0;
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if (!on) {
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PKWR = 0;
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return 0;
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}
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for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
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gpio = pxa27x_pkwr_gpio[i];
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if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
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mask |= gpio_desc[gpio].mask;
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}
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PKWR = mask;
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return 0;
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}
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static int __init pxa27x_mfp_init(void)
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{
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int i, gpio;
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if (cpu_is_pxa27x()) {
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for (i = 0; i <= 120; i++) {
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/* skip GPIO2, 5, 6, 7, 8, they are not
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* valid pins allow configuration
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*/
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if (i == 2 || i == 5 || i == 6 ||
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i == 7 || i == 8)
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continue;
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gpio_desc[i].valid = 1;
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}
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/* Keypad GPIOs */
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for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
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gpio = pxa27x_pkwr_gpio[i];
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gpio_desc[gpio].can_wakeup = 1;
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gpio_desc[gpio].keypad_gpio = 1;
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gpio_desc[gpio].mask = 1 << i;
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}
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/* Overwrite GPIO13 as a PWER wakeup source */
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for (i = 0; i <= 15; i++) {
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/* skip GPIO2, 5, 6, 7, 8 */
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if (GPIO_bit(i) & 0x1e4)
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continue;
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gpio_desc[i].can_wakeup = 1;
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gpio_desc[i].mask = GPIO_bit(i);
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}
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gpio_desc[35].can_wakeup = 1;
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gpio_desc[35].mask = PWER_WE35;
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}
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return 0;
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}
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postcore_initcall(pxa27x_mfp_init);
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#endif /* CONFIG_PXA27x */
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