440 lines
9.8 KiB
C
440 lines
9.8 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/gpio.h>
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#include <linux/gpio-pxa.h>
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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/io.h>
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#include <linux/syscore_ops.h>
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#include <mach/pxa2xx-regs.h>
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#include "mfp-pxa2xx.h"
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#include "generic.h"
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#define PGSR(x) __REG2(0x40F00020, (x) << 2)
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#define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
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#define GAFR_L(x) __GAFR(0, x)
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#define GAFR_U(x) __GAFR(1, x)
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#define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
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#define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5))
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#define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
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#define GPSR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
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#define GPCR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
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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 dir_inverted : 1;
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unsigned int mask; /* bit mask in PWER or PKWR */
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unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
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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 unsigned long gpdr_lpm[4];
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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 bank = gpio_to_bank(gpio);
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int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
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int shft = (gpio & 0xf) << 1;
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int fn = MFP_AF(c);
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int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
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if (fn > 3)
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return -EINVAL;
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/* alternate function and direction at run-time */
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gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
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gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
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if (uorl == 0)
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GAFR_L(bank) = gafr;
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else
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GAFR_U(bank) = gafr;
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if (is_out ^ gpio_desc[gpio].dir_inverted)
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GPDR(gpio) |= mask;
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else
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GPDR(gpio) &= ~mask;
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/* alternate function and direction at low power mode */
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switch (c & MFP_LPM_STATE_MASK) {
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case MFP_LPM_DRIVE_HIGH:
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PGSR(bank) |= mask;
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is_out = 1;
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break;
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case MFP_LPM_DRIVE_LOW:
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PGSR(bank) &= ~mask;
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is_out = 1;
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break;
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case MFP_LPM_INPUT:
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case MFP_LPM_DEFAULT:
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break;
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default:
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/* warning and fall through, treat as MFP_LPM_DEFAULT */
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pr_warn("%s: GPIO%d: unsupported low power mode\n",
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__func__, gpio);
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break;
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}
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if (is_out ^ gpio_desc[gpio].dir_inverted)
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gpdr_lpm[bank] |= mask;
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else
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gpdr_lpm[bank] &= ~mask;
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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_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
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return -EINVAL;
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}
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if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
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pr_warn("%s: output GPIO%d unable to wakeup\n", __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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static inline int __mfp_validate(int mfp)
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{
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int gpio = mfp_to_gpio(mfp);
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if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
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pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
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return -1;
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}
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return gpio;
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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_validate(MFP_PIN(*c));
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if (gpio < 0)
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continue;
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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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void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
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{
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unsigned long flags, c;
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int gpio;
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gpio = __mfp_validate(mfp);
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if (gpio < 0)
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return;
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local_irq_save(flags);
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c = gpio_desc[gpio].config;
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c = (c & ~MFP_LPM_STATE_MASK) | lpm;
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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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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, mux_taken;
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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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/* Allow keypad GPIOs to wakeup system when
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* configured as generic GPIOs.
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*/
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if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
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(d->config & MFP_LPM_CAN_WAKEUP)) {
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if (on)
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PKWR |= d->mask;
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else
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PKWR &= ~d->mask;
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return 0;
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}
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mux_taken = (PWER & d->mux_mask) & (~d->mask);
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if (on && mux_taken)
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return -EBUSY;
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if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
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if (on) {
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PWER = (PWER & ~d->mux_mask) | 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 void __init pxa25x_mfp_init(void)
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{
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int i;
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/* running before pxa_gpio_probe() */
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#ifdef CONFIG_CPU_PXA26x
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pxa_last_gpio = 89;
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#else
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pxa_last_gpio = 84;
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#endif
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for (i = 0; i <= pxa_last_gpio; 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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/* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
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* direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
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*/
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for (i = 86; i <= pxa_last_gpio; i++)
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gpio_desc[i].dir_inverted = 1;
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}
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#else
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static inline void pxa25x_mfp_init(void) {}
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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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struct gpio_desc *d;
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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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d = &gpio_desc[gpio];
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/* skip if configured as generic GPIO */
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if (MFP_AF(d->config) == 0)
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continue;
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if (d->config & MFP_LPM_CAN_WAKEUP)
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mask |= gpio_desc[gpio].mask;
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}
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if (on)
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PKWR |= mask;
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else
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PKWR &= ~mask;
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return 0;
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}
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#define PWER_WEMUX2_GPIO38 (1 << 16)
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#define PWER_WEMUX2_GPIO53 (2 << 16)
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#define PWER_WEMUX2_GPIO40 (3 << 16)
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#define PWER_WEMUX2_GPIO36 (4 << 16)
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#define PWER_WEMUX2_MASK (7 << 16)
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#define PWER_WEMUX3_GPIO31 (1 << 19)
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#define PWER_WEMUX3_GPIO113 (2 << 19)
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#define PWER_WEMUX3_MASK (3 << 19)
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#define INIT_GPIO_DESC_MUXED(mux, gpio) \
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do { \
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gpio_desc[(gpio)].can_wakeup = 1; \
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gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
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gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
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} while (0)
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static void __init pxa27x_mfp_init(void)
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{
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int i, gpio;
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pxa_last_gpio = 120; /* running before pxa_gpio_probe() */
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for (i = 0; i <= pxa_last_gpio; 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 || 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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INIT_GPIO_DESC_MUXED(WEMUX3, 31);
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INIT_GPIO_DESC_MUXED(WEMUX3, 113);
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INIT_GPIO_DESC_MUXED(WEMUX2, 38);
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INIT_GPIO_DESC_MUXED(WEMUX2, 53);
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INIT_GPIO_DESC_MUXED(WEMUX2, 40);
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INIT_GPIO_DESC_MUXED(WEMUX2, 36);
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}
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#else
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static inline void pxa27x_mfp_init(void) {}
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#endif /* CONFIG_PXA27x */
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#ifdef CONFIG_PM
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static unsigned long saved_gafr[2][4];
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static unsigned long saved_gpdr[4];
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static unsigned long saved_gplr[4];
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static unsigned long saved_pgsr[4];
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static int pxa2xx_mfp_suspend(void)
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{
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int i;
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/* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
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for (i = 0; i < pxa_last_gpio; i++) {
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if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
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(GPDR(i) & GPIO_bit(i))) {
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if (GPLR(i) & GPIO_bit(i))
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PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
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else
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PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
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}
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}
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for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
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saved_gafr[0][i] = GAFR_L(i);
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saved_gafr[1][i] = GAFR_U(i);
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saved_gpdr[i] = GPDR(i * 32);
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saved_gplr[i] = GPLR(i * 32);
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saved_pgsr[i] = PGSR(i);
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GPSR(i * 32) = PGSR(i);
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GPCR(i * 32) = ~PGSR(i);
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}
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/* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
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for (i = 0; i < pxa_last_gpio; i++) {
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if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
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((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
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(saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
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GPDR(i) |= GPIO_bit(i);
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else
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GPDR(i) &= ~GPIO_bit(i);
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}
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return 0;
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}
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static void pxa2xx_mfp_resume(void)
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{
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int i;
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for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
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GAFR_L(i) = saved_gafr[0][i];
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GAFR_U(i) = saved_gafr[1][i];
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GPSR(i * 32) = saved_gplr[i];
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GPCR(i * 32) = ~saved_gplr[i];
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GPDR(i * 32) = saved_gpdr[i];
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PGSR(i) = saved_pgsr[i];
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}
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PSSR = PSSR_RDH | PSSR_PH;
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}
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#else
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#define pxa2xx_mfp_suspend NULL
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#define pxa2xx_mfp_resume NULL
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#endif
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struct syscore_ops pxa2xx_mfp_syscore_ops = {
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.suspend = pxa2xx_mfp_suspend,
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.resume = pxa2xx_mfp_resume,
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};
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static int __init pxa2xx_mfp_init(void)
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{
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int i;
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if (!cpu_is_pxa2xx())
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return 0;
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if (cpu_is_pxa25x())
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pxa25x_mfp_init();
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if (cpu_is_pxa27x())
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pxa27x_mfp_init();
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/* clear RDH bit to enable GPIO receivers after reset/sleep exit */
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PSSR = PSSR_RDH;
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/* initialize gafr_run[], pgsr_lpm[] from existing values */
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for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
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gpdr_lpm[i] = GPDR(i * 32);
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return 0;
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}
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postcore_initcall(pxa2xx_mfp_init);
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