File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/arch/arm/mach-pxa/mfp-pxa2xx.c b/arch/arm/mach-pxa/mfp-pxa2xx.c
new file mode 100644
index 0000000..666b789
--- /dev/null
+++ b/arch/arm/mach-pxa/mfp-pxa2xx.c
@@ -0,0 +1,439 @@
+/*
+ * 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/gpio.h>
+#include <linux/gpio-pxa.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/syscore_ops.h>
+
+#include <mach/pxa2xx-regs.h>
+#include <mach/mfp-pxa2xx.h>
+
+#include "generic.h"
+
+#define PGSR(x) __REG2(0x40F00020, (x) << 2)
+#define __GAFR(u, x) __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
+#define GAFR_L(x) __GAFR(0, x)
+#define GAFR_U(x) __GAFR(1, x)
+
+#define BANK_OFF(n) (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
+#define GPLR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5))
+#define GPDR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
+#define GPSR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
+#define GPCR(x) __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
+
+#define PWER_WE35 (1 << 24)
+
+struct gpio_desc {
+ unsigned valid : 1;
+ unsigned can_wakeup : 1;
+ unsigned keypad_gpio : 1;
+ unsigned dir_inverted : 1;
+ unsigned int mask; /* bit mask in PWER or PKWR */
+ unsigned int mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
+ unsigned long config;
+};
+
+static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
+
+static unsigned long gpdr_lpm[4];
+
+static int __mfp_config_gpio(unsigned gpio, unsigned long c)
+{
+ unsigned long gafr, mask = GPIO_bit(gpio);
+ int bank = gpio_to_bank(gpio);
+ int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
+ int shft = (gpio & 0xf) << 1;
+ int fn = MFP_AF(c);
+ int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
+
+ if (fn > 3)
+ return -EINVAL;
+
+ /* alternate function and direction at run-time */
+ gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
+ gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
+
+ if (uorl == 0)
+ GAFR_L(bank) = gafr;
+ else
+ GAFR_U(bank) = gafr;
+
+ if (is_out ^ gpio_desc[gpio].dir_inverted)
+ GPDR(gpio) |= mask;
+ else
+ GPDR(gpio) &= ~mask;
+
+ /* alternate function and direction at low power mode */
+ switch (c & MFP_LPM_STATE_MASK) {
+ case MFP_LPM_DRIVE_HIGH:
+ PGSR(bank) |= mask;
+ is_out = 1;
+ break;
+ case MFP_LPM_DRIVE_LOW:
+ PGSR(bank) &= ~mask;
+ is_out = 1;
+ break;
+ case MFP_LPM_INPUT:
+ case MFP_LPM_DEFAULT:
+ break;
+ default:
+ /* warning and fall through, treat as MFP_LPM_DEFAULT */
+ pr_warn("%s: GPIO%d: unsupported low power mode\n",
+ __func__, gpio);
+ break;
+ }
+
+ if (is_out ^ gpio_desc[gpio].dir_inverted)
+ gpdr_lpm[bank] |= mask;
+ else
+ gpdr_lpm[bank] &= ~mask;
+
+ /* 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_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
+ return -EINVAL;
+ }
+
+ if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
+ pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static inline int __mfp_validate(int mfp)
+{
+ int gpio = mfp_to_gpio(mfp);
+
+ if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
+ pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
+ return -1;
+ }
+
+ return gpio;
+}
+
+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_validate(MFP_PIN(*c));
+ if (gpio < 0)
+ continue;
+
+ local_irq_save(flags);
+
+ gpio_desc[gpio].config = *c;
+ __mfp_config_gpio(gpio, *c);
+
+ local_irq_restore(flags);
+ }
+}
+
+void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
+{
+ unsigned long flags, c;
+ int gpio;
+
+ gpio = __mfp_validate(mfp);
+ if (gpio < 0)
+ return;
+
+ local_irq_save(flags);
+
+ c = gpio_desc[gpio].config;
+ c = (c & ~MFP_LPM_STATE_MASK) | lpm;
+ __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, mux_taken;
+
+ if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
+ return -EINVAL;
+
+ d = &gpio_desc[gpio];
+ c = d->config;
+
+ if (!d->valid)
+ return -EINVAL;
+
+ /* Allow keypad GPIOs to wakeup system when
+ * configured as generic GPIOs.
+ */
+ if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
+ (d->config & MFP_LPM_CAN_WAKEUP)) {
+ if (on)
+ PKWR |= d->mask;
+ else
+ PKWR &= ~d->mask;
+ return 0;
+ }
+
+ mux_taken = (PWER & d->mux_mask) & (~d->mask);
+ if (on && mux_taken)
+ return -EBUSY;
+
+ if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
+ if (on) {
+ PWER = (PWER & ~d->mux_mask) | 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 void __init pxa25x_mfp_init(void)
+{
+ int i;
+
+ /* running before pxa_gpio_probe() */
+#ifdef CONFIG_CPU_PXA26x
+ pxa_last_gpio = 89;
+#else
+ pxa_last_gpio = 84;
+#endif
+ for (i = 0; i <= pxa_last_gpio; 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);
+ }
+
+ /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
+ * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
+ */
+ for (i = 86; i <= pxa_last_gpio; i++)
+ gpio_desc[i].dir_inverted = 1;
+}
+#else
+static inline void pxa25x_mfp_init(void) {}
+#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;
+ struct gpio_desc *d;
+
+ for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
+
+ gpio = pxa27x_pkwr_gpio[i];
+ d = &gpio_desc[gpio];
+
+ /* skip if configured as generic GPIO */
+ if (MFP_AF(d->config) == 0)
+ continue;
+
+ if (d->config & MFP_LPM_CAN_WAKEUP)
+ mask |= gpio_desc[gpio].mask;
+ }
+
+ if (on)
+ PKWR |= mask;
+ else
+ PKWR &= ~mask;
+ return 0;
+}
+
+#define PWER_WEMUX2_GPIO38 (1 << 16)
+#define PWER_WEMUX2_GPIO53 (2 << 16)
+#define PWER_WEMUX2_GPIO40 (3 << 16)
+#define PWER_WEMUX2_GPIO36 (4 << 16)
+#define PWER_WEMUX2_MASK (7 << 16)
+#define PWER_WEMUX3_GPIO31 (1 << 19)
+#define PWER_WEMUX3_GPIO113 (2 << 19)
+#define PWER_WEMUX3_MASK (3 << 19)
+
+#define INIT_GPIO_DESC_MUXED(mux, gpio) \
+do { \
+ gpio_desc[(gpio)].can_wakeup = 1; \
+ gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio; \
+ gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK; \
+} while (0)
+
+static void __init pxa27x_mfp_init(void)
+{
+ int i, gpio;
+
+ pxa_last_gpio = 120; /* running before pxa_gpio_probe() */
+ for (i = 0; i <= pxa_last_gpio; 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;
+
+ INIT_GPIO_DESC_MUXED(WEMUX3, 31);
+ INIT_GPIO_DESC_MUXED(WEMUX3, 113);
+ INIT_GPIO_DESC_MUXED(WEMUX2, 38);
+ INIT_GPIO_DESC_MUXED(WEMUX2, 53);
+ INIT_GPIO_DESC_MUXED(WEMUX2, 40);
+ INIT_GPIO_DESC_MUXED(WEMUX2, 36);
+}
+#else
+static inline void pxa27x_mfp_init(void) {}
+#endif /* CONFIG_PXA27x */
+
+#ifdef CONFIG_PM
+static unsigned long saved_gafr[2][4];
+static unsigned long saved_gpdr[4];
+static unsigned long saved_gplr[4];
+static unsigned long saved_pgsr[4];
+
+static int pxa2xx_mfp_suspend(void)
+{
+ int i;
+
+ /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
+ for (i = 0; i < pxa_last_gpio; i++) {
+ if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
+ (GPDR(i) & GPIO_bit(i))) {
+ if (GPLR(i) & GPIO_bit(i))
+ PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
+ else
+ PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
+ }
+ }
+
+ for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
+ saved_gafr[0][i] = GAFR_L(i);
+ saved_gafr[1][i] = GAFR_U(i);
+ saved_gpdr[i] = GPDR(i * 32);
+ saved_gplr[i] = GPLR(i * 32);
+ saved_pgsr[i] = PGSR(i);
+
+ GPSR(i * 32) = PGSR(i);
+ GPCR(i * 32) = ~PGSR(i);
+ }
+
+ /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
+ for (i = 0; i < pxa_last_gpio; i++) {
+ if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
+ ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
+ (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
+ GPDR(i) |= GPIO_bit(i);
+ else
+ GPDR(i) &= ~GPIO_bit(i);
+ }
+
+ return 0;
+}
+
+static void pxa2xx_mfp_resume(void)
+{
+ int i;
+
+ for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
+ GAFR_L(i) = saved_gafr[0][i];
+ GAFR_U(i) = saved_gafr[1][i];
+ GPSR(i * 32) = saved_gplr[i];
+ GPCR(i * 32) = ~saved_gplr[i];
+ GPDR(i * 32) = saved_gpdr[i];
+ PGSR(i) = saved_pgsr[i];
+ }
+ PSSR = PSSR_RDH | PSSR_PH;
+}
+#else
+#define pxa2xx_mfp_suspend NULL
+#define pxa2xx_mfp_resume NULL
+#endif
+
+struct syscore_ops pxa2xx_mfp_syscore_ops = {
+ .suspend = pxa2xx_mfp_suspend,
+ .resume = pxa2xx_mfp_resume,
+};
+
+static int __init pxa2xx_mfp_init(void)
+{
+ int i;
+
+ if (!cpu_is_pxa2xx())
+ return 0;
+
+ if (cpu_is_pxa25x())
+ pxa25x_mfp_init();
+
+ if (cpu_is_pxa27x())
+ pxa27x_mfp_init();
+
+ /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
+ PSSR = PSSR_RDH;
+
+ /* initialize gafr_run[], pgsr_lpm[] from existing values */
+ for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
+ gpdr_lpm[i] = GPDR(i * 32);
+
+ return 0;
+}
+postcore_initcall(pxa2xx_mfp_init);