1 files changed, 437 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 000000000..57b078288
--- /dev/null
+++ b/arch/arm/mach-pxa/mfp-pxa2xx.c
@@ -0,0 +1,437 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  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.
+ */
+#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 <linux/soc/pxa/cpu.h>
+
+#include "pxa2xx-regs.h"
+#include "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);