2 files changed, 192 insertions, 2 deletions

diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index 10e0c0dce198..df2eb9fcf942 100644
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -5,8 +5,8 @@
 # Common support (must be linked before board specific support)
 obj-y                           += clock.o devices.o generic.o irq.o dma.o \
                                    time.o gpio.o
-obj-$(CONFIG_PXA25x)            += pxa25x.o
-obj-$(CONFIG_PXA27x)            += pxa27x.o
+obj-$(CONFIG_PXA25x)            += pxa25x.o mfp-pxa2xx.o
+obj-$(CONFIG_PXA27x)            += pxa27x.o mfp-pxa2xx.o
 obj-$(CONFIG_PXA3xx)            += pxa3xx.o mfp-pxa3xx.o smemc.o
 obj-$(CONFIG_CPU_PXA300)        += pxa300.o
 obj-$(CONFIG_CPU_PXA320)        += pxa320.o
diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c
new file mode 100644
index 000000000000..f85f681c0393
--- /dev/null
+++ b/arch/arm/mach-pxa/mfp-pxa2xx.c
@@ -0,0 +1,190 @@
+/*
+ *  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 */