1 files changed, 328 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-sa1100.c b/drivers/gpio/gpio-sa1100.c
new file mode 100644
index 000000000..edff5e814
--- /dev/null
+++ b/drivers/gpio/gpio-sa1100.c
@@ -0,0 +1,328 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/arch/arm/mach-sa1100/gpio.c
+ *
+ * Generic SA-1100 GPIO handling
+ */
+#include <linux/gpio/driver.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/syscore_ops.h>
+#include <soc/sa1100/pwer.h>
+#include <mach/hardware.h>
+#include <mach/irqs.h>
+
+struct sa1100_gpio_chip {
+	struct gpio_chip chip;
+	void __iomem *membase;
+	int irqbase;
+	u32 irqmask;
+	u32 irqrising;
+	u32 irqfalling;
+	u32 irqwake;
+};
+
+#define sa1100_gpio_chip(x) container_of(x, struct sa1100_gpio_chip, chip)
+
+enum {
+	R_GPLR = 0x00,
+	R_GPDR = 0x04,
+	R_GPSR = 0x08,
+	R_GPCR = 0x0c,
+	R_GRER = 0x10,
+	R_GFER = 0x14,
+	R_GEDR = 0x18,
+	R_GAFR = 0x1c,
+};
+
+static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	return readl_relaxed(sa1100_gpio_chip(chip)->membase + R_GPLR) &
+		BIT(offset);
+}
+
+static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+	int reg = value ? R_GPSR : R_GPCR;
+
+	writel_relaxed(BIT(offset), sa1100_gpio_chip(chip)->membase + reg);
+}
+
+static int sa1100_get_direction(struct gpio_chip *chip, unsigned offset)
+{
+	void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR;
+
+	if (readl_relaxed(gpdr) & BIT(offset))
+		return GPIO_LINE_DIRECTION_OUT;
+
+	return GPIO_LINE_DIRECTION_IN;
+}
+
+static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	writel_relaxed(readl_relaxed(gpdr) & ~BIT(offset), gpdr);
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
+{
+	void __iomem *gpdr = sa1100_gpio_chip(chip)->membase + R_GPDR;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	sa1100_gpio_set(chip, offset, value);
+	writel_relaxed(readl_relaxed(gpdr) | BIT(offset), gpdr);
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	return sa1100_gpio_chip(chip)->irqbase + offset;
+}
+
+static struct sa1100_gpio_chip sa1100_gpio_chip = {
+	.chip = {
+		.label			= "gpio",
+		.get_direction		= sa1100_get_direction,
+		.direction_input	= sa1100_direction_input,
+		.direction_output	= sa1100_direction_output,
+		.set			= sa1100_gpio_set,
+		.get			= sa1100_gpio_get,
+		.to_irq			= sa1100_to_irq,
+		.base			= 0,
+		.ngpio			= GPIO_MAX + 1,
+	},
+	.membase = (void *)&GPLR,
+	.irqbase = IRQ_GPIO0,
+};
+
+/*
+ * SA1100 GPIO edge detection for IRQs:
+ * IRQs are generated on Falling-Edge, Rising-Edge, or both.
+ * Use this instead of directly setting GRER/GFER.
+ */
+static void sa1100_update_edge_regs(struct sa1100_gpio_chip *sgc)
+{
+	void *base = sgc->membase;
+	u32 grer, gfer;
+
+	grer = sgc->irqrising & sgc->irqmask;
+	gfer = sgc->irqfalling & sgc->irqmask;
+
+	writel_relaxed(grer, base + R_GRER);
+	writel_relaxed(gfer, base + R_GFER);
+}
+
+static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
+{
+	struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
+	unsigned int mask = BIT(d->hwirq);
+
+	if (type == IRQ_TYPE_PROBE) {
+		if ((sgc->irqrising | sgc->irqfalling) & mask)
+			return 0;
+		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
+	}
+
+	if (type & IRQ_TYPE_EDGE_RISING)
+		sgc->irqrising |= mask;
+	else
+		sgc->irqrising &= ~mask;
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		sgc->irqfalling |= mask;
+	else
+		sgc->irqfalling &= ~mask;
+
+	sa1100_update_edge_regs(sgc);
+
+	return 0;
+}
+
+/*
+ * GPIO IRQs must be acknowledged.
+ */
+static void sa1100_gpio_ack(struct irq_data *d)
+{
+	struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
+
+	writel_relaxed(BIT(d->hwirq), sgc->membase + R_GEDR);
+}
+
+static void sa1100_gpio_mask(struct irq_data *d)
+{
+	struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
+	unsigned int mask = BIT(d->hwirq);
+
+	sgc->irqmask &= ~mask;
+
+	sa1100_update_edge_regs(sgc);
+}
+
+static void sa1100_gpio_unmask(struct irq_data *d)
+{
+	struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
+	unsigned int mask = BIT(d->hwirq);
+
+	sgc->irqmask |= mask;
+
+	sa1100_update_edge_regs(sgc);
+}
+
+static int sa1100_gpio_wake(struct irq_data *d, unsigned int on)
+{
+	struct sa1100_gpio_chip *sgc = irq_data_get_irq_chip_data(d);
+	int ret = sa11x0_gpio_set_wake(d->hwirq, on);
+	if (!ret) {
+		if (on)
+			sgc->irqwake |= BIT(d->hwirq);
+		else
+			sgc->irqwake &= ~BIT(d->hwirq);
+	}
+	return ret;
+}
+
+/*
+ * This is for GPIO IRQs
+ */
+static struct irq_chip sa1100_gpio_irq_chip = {
+	.name		= "GPIO",
+	.irq_ack	= sa1100_gpio_ack,
+	.irq_mask	= sa1100_gpio_mask,
+	.irq_unmask	= sa1100_gpio_unmask,
+	.irq_set_type	= sa1100_gpio_type,
+	.irq_set_wake	= sa1100_gpio_wake,
+};
+
+static int sa1100_gpio_irqdomain_map(struct irq_domain *d,
+		unsigned int irq, irq_hw_number_t hwirq)
+{
+	struct sa1100_gpio_chip *sgc = d->host_data;
+
+	irq_set_chip_data(irq, sgc);
+	irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip, handle_edge_irq);
+	irq_set_probe(irq);
+
+	return 0;
+}
+
+static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = {
+	.map = sa1100_gpio_irqdomain_map,
+	.xlate = irq_domain_xlate_onetwocell,
+};
+
+static struct irq_domain *sa1100_gpio_irqdomain;
+
+/*
+ * IRQ 0-11 (GPIO) handler.  We enter here with the
+ * irq_controller_lock held, and IRQs disabled.  Decode the IRQ
+ * and call the handler.
+ */
+static void sa1100_gpio_handler(struct irq_desc *desc)
+{
+	struct sa1100_gpio_chip *sgc = irq_desc_get_handler_data(desc);
+	unsigned int irq, mask;
+	void __iomem *gedr = sgc->membase + R_GEDR;
+
+	mask = readl_relaxed(gedr);
+	do {
+		/*
+		 * clear down all currently active IRQ sources.
+		 * We will be processing them all.
+		 */
+		writel_relaxed(mask, gedr);
+
+		irq = sgc->irqbase;
+		do {
+			if (mask & 1)
+				generic_handle_irq(irq);
+			mask >>= 1;
+			irq++;
+		} while (mask);
+
+		mask = readl_relaxed(gedr);
+	} while (mask);
+}
+
+static int sa1100_gpio_suspend(void)
+{
+	struct sa1100_gpio_chip *sgc = &sa1100_gpio_chip;
+
+	/*
+	 * Set the appropriate edges for wakeup.
+	 */
+	writel_relaxed(sgc->irqwake & sgc->irqrising, sgc->membase + R_GRER);
+	writel_relaxed(sgc->irqwake & sgc->irqfalling, sgc->membase + R_GFER);
+
+	/*
+	 * Clear any pending GPIO interrupts.
+	 */
+	writel_relaxed(readl_relaxed(sgc->membase + R_GEDR),
+		       sgc->membase + R_GEDR);
+
+	return 0;
+}
+
+static void sa1100_gpio_resume(void)
+{
+	sa1100_update_edge_regs(&sa1100_gpio_chip);
+}
+
+static struct syscore_ops sa1100_gpio_syscore_ops = {
+	.suspend	= sa1100_gpio_suspend,
+	.resume		= sa1100_gpio_resume,
+};
+
+static int __init sa1100_gpio_init_devicefs(void)
+{
+	register_syscore_ops(&sa1100_gpio_syscore_ops);
+	return 0;
+}
+
+device_initcall(sa1100_gpio_init_devicefs);
+
+static const int sa1100_gpio_irqs[] __initconst = {
+	/* Install handlers for GPIO 0-10 edge detect interrupts */
+	IRQ_GPIO0_SC,
+	IRQ_GPIO1_SC,
+	IRQ_GPIO2_SC,
+	IRQ_GPIO3_SC,
+	IRQ_GPIO4_SC,
+	IRQ_GPIO5_SC,
+	IRQ_GPIO6_SC,
+	IRQ_GPIO7_SC,
+	IRQ_GPIO8_SC,
+	IRQ_GPIO9_SC,
+	IRQ_GPIO10_SC,
+	/* Install handler for GPIO 11-27 edge detect interrupts */
+	IRQ_GPIO11_27,
+};
+
+void __init sa1100_init_gpio(void)
+{
+	struct sa1100_gpio_chip *sgc = &sa1100_gpio_chip;
+	int i;
+
+	/* clear all GPIO edge detects */
+	writel_relaxed(0, sgc->membase + R_GFER);
+	writel_relaxed(0, sgc->membase + R_GRER);
+	writel_relaxed(-1, sgc->membase + R_GEDR);
+
+	gpiochip_add_data(&sa1100_gpio_chip.chip, NULL);
+
+	sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
+			28, IRQ_GPIO0,
+			&sa1100_gpio_irqdomain_ops, sgc);
+
+	for (i = 0; i < ARRAY_SIZE(sa1100_gpio_irqs); i++)
+		irq_set_chained_handler_and_data(sa1100_gpio_irqs[i],
+						 sa1100_gpio_handler, sgc);
+}