1 files changed, 245 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c
new file mode 100644
index 000000000000..22097a1707cc
--- /dev/null
+++ b/arch/arm/mach-pxa/mfp-pxa2xx.c
@@ -0,0 +1,245 @@
+/*
+ *  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)
+
+struct gpio_desc {
+        unsigned        valid           : 1;
+        unsigned        can_wakeup      : 1;
+        unsigned        keypad_gpio     : 1;
+        unsigned int    mask; /* bit mask in PWER or PKWR */
+        unsigned long   config;
+};
+
+static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
+
+static 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;
+        }
+
+        /* 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) && (c & MFP_DIR_OUT)) {
+                pr_warning("%s: output GPIO%d unable to wakeup\n",
+                                __func__, gpio);
+                return -EINVAL;
+        }
+
+        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);
+        }
+}
+
+int gpio_set_wake(unsigned int gpio, unsigned int on)
+{
+        struct gpio_desc *d;
+        unsigned long c;
+
+        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;
+
+        if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
+                if (on) {
+                        PWER |= 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 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[] = {
+        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;
+}
+
+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 */