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Diffstat (limited to 'arch/arm/mach-pxa/mfp-pxa2xx.c')
-rw-r--r--arch/arm/mach-pxa/mfp-pxa2xx.c245
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 00000000000..22097a1707c
--- /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 */