ramips: add get_direction() callback and irq support to gpio-mt7621

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 46955

1 files changed, 188 insertions, 12 deletions

diff --git a/target/linux/ramips/patches-3.18/0048-GPIO-ralink-add-mt7621-gpio-controller.patch b/target/linux/ramips/patches-3.18/0048-GPIO-ralink-add-mt7621-gpio-controller.patch
index 2f44f98879..5d5f99e1ed 100644
--- a/target/linux/ramips/patches-3.18/0048-GPIO-ralink-add-mt7621-gpio-controller.patch
+++ b/target/linux/ramips/patches-3.18/0048-GPIO-ralink-add-mt7621-gpio-controller.patch
@@ -14,7 +14,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 
 --- a/arch/mips/Kconfig
 +++ b/arch/mips/Kconfig
-@@ -455,6 +455,9 @@ config RALINK
+@@ -455,6 +455,9 @@
  	select RESET_CONTROLLER
  	select PINCTRL
  	select PINCTRL_RT2880
@@ -26,7 +26,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  	bool "SGI IP22 (Indy/Indigo2)"
 --- a/drivers/gpio/Kconfig
 +++ b/drivers/gpio/Kconfig
-@@ -898,6 +898,12 @@ config GPIO_BCM_KONA
+@@ -898,6 +898,12 @@
  	help
  	  Turn on GPIO support for Broadcom "Kona" chips.
  
@@ -41,7 +41,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  config GPIO_VIPERBOARD
 --- a/drivers/gpio/Makefile
 +++ b/drivers/gpio/Makefile
-@@ -107,3 +107,5 @@ obj-$(CONFIG_GPIO_XILINX)	+= gpio-xilinx
+@@ -107,3 +107,5 @@
  obj-$(CONFIG_GPIO_XTENSA)	+= gpio-xtensa.o
  obj-$(CONFIG_GPIO_ZEVIO)	+= gpio-zevio.o
  obj-$(CONFIG_GPIO_ZYNQ)		+= gpio-zynq.o
@@ -49,7 +49,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +
 --- /dev/null
 +++ b/drivers/gpio/gpio-mt7621.c
-@@ -0,0 +1,178 @@
+@@ -0,0 +1,354 @@
 +/*
 + * 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
@@ -69,6 +69,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +#include <linux/interrupt.h>
 +#include <linux/platform_device.h>
 +
++#define MTK_MAX_BANK		3
 +#define MTK_BANK_WIDTH		32
 +
 +enum mediatek_gpio_reg {
@@ -77,15 +78,26 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +	GPIO_REG_DATA,
 +	GPIO_REG_DSET,
 +	GPIO_REG_DCLR,
++	GPIO_REG_REDGE,
++	GPIO_REG_FEDGE,
++	GPIO_REG_HLVL,
++	GPIO_REG_LLVL,
++	GPIO_REG_STAT,
++	GPIO_REG_EDGE,
 +};
 +
-+static void __iomem *mtk_gc_membase;
++static void __iomem *mediatek_gpio_membase;
++static int mediatek_gpio_irq;
++static struct irq_domain *mediatek_gpio_irq_domain;
++static atomic_t irq_refcount = ATOMIC_INIT(0);
 +
 +struct mtk_gc {
 +	struct gpio_chip chip;
 +	spinlock_t lock;
 +	int bank;
-+};
++	u32 rising;
++	u32 falling;
++} *gc_map[MTK_MAX_BANK];
 +
 +static inline struct mtk_gc
 +*to_mediatek_gpio(struct gpio_chip *chip)
@@ -100,13 +112,13 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +static inline void
 +mtk_gpio_w32(struct mtk_gc *rg, u8 reg, u32 val)
 +{
-+	iowrite32(val, mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4));
++	iowrite32(val, mediatek_gpio_membase + (reg * 0x10) + (rg->bank * 0x4));
 +}
 +
 +static inline u32
 +mtk_gpio_r32(struct mtk_gc *rg, u8 reg)
 +{
-+	return ioread32(mtk_gc_membase + (reg * 0x10) + (rg->bank * 0x4));
++	return ioread32(mediatek_gpio_membase + (reg * 0x10) + (rg->bank * 0x4));
 +}
 +
 +static void
@@ -160,14 +172,44 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +}
 +
 +static int
++mediatek_gpio_get_direction(struct gpio_chip *chip, unsigned offset)
++{
++	struct mtk_gc *rg = to_mediatek_gpio(chip);
++	unsigned long flags;
++	u32 t;
++
++	spin_lock_irqsave(&rg->lock, flags);
++	t = mtk_gpio_r32(rg, GPIO_REG_CTRL);
++	spin_unlock_irqrestore(&rg->lock, flags);
++
++	if (t & BIT(offset))
++		return 0;
++
++	return 1;
++}
++
++static int
++mediatek_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
++{
++	struct mtk_gc *rg = to_mediatek_gpio(chip);
++
++	return irq_create_mapping(mediatek_gpio_irq_domain, pin + (rg->bank * MTK_BANK_WIDTH));
++}
++
++static int
 +mediatek_gpio_bank_probe(struct platform_device *pdev, struct device_node *bank)
 +{
 +	const __be32 *id = of_get_property(bank, "reg", NULL);
 +	struct mtk_gc *rg = devm_kzalloc(&pdev->dev,
 +				sizeof(struct mtk_gc), GFP_KERNEL);
-+	if (!rg || !id)
++
++	if (!rg || !id || be32_to_cpu(*id) > MTK_MAX_BANK)
 +		return -ENOMEM;
 +
++	gc_map[be32_to_cpu(*id)] = rg;
++
++	memset(rg, 0, sizeof(struct mtk_gc));
++
 +	spin_lock_init(&rg->lock);
 +
 +	rg->chip.dev = &pdev->dev;
@@ -177,8 +219,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +	rg->chip.ngpio = MTK_BANK_WIDTH;
 +	rg->chip.direction_input = mediatek_gpio_direction_input;
 +	rg->chip.direction_output = mediatek_gpio_direction_output;
++	rg->chip.get_direction = mediatek_gpio_get_direction;
 +	rg->chip.get = mediatek_gpio_get;
 +	rg->chip.set = mediatek_gpio_set;
++	if (mediatek_gpio_irq_domain)
++		rg->chip.to_irq = mediatek_gpio_to_irq;
 +	rg->bank = be32_to_cpu(*id);
 +
 +	/* set polarity to low for all gpios */
@@ -189,20 +234,151 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +	return gpiochip_add(&rg->chip);
 +}
 +
++static void
++mediatek_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
++{
++	int i;
++
++	for (i = 0; i < MTK_MAX_BANK; i++) {
++		struct mtk_gc *rg = gc_map[i];
++		unsigned long pending;
++		int bit;
++
++		if (!rg)
++			continue;
++
++		pending = mtk_gpio_r32(rg, GPIO_REG_STAT);
++
++		for_each_set_bit(bit, &pending, MTK_BANK_WIDTH) {
++			u32 map = irq_find_mapping(mediatek_gpio_irq_domain, bit);
++
++			generic_handle_irq(map);
++			mtk_gpio_w32(rg, GPIO_REG_STAT, BIT(bit));
++		}
++	}
++}
++
++static void
++mediatek_gpio_irq_unmask(struct irq_data *d)
++{
++	int pin = d->hwirq;
++	int bank = pin / 32;
++	struct mtk_gc *rg = gc_map[bank];
++	unsigned long flags;
++	u32 rise, fall;
++
++	if (!rg)
++		return;
++
++	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
++	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
++
++	spin_lock_irqsave(&rg->lock, flags);
++	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise | (BIT(d->hwirq) & rg->rising));
++	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall | (BIT(d->hwirq) & rg->falling));
++	spin_unlock_irqrestore(&rg->lock, flags);
++}
++
++static void
++mediatek_gpio_irq_mask(struct irq_data *d)
++{
++	int pin = d->hwirq;
++	int bank = pin / 32;
++	struct mtk_gc *rg = gc_map[bank];
++	unsigned long flags;
++	u32 rise, fall;
++
++	if (!rg)
++		return;
++
++	rise = mtk_gpio_r32(rg, GPIO_REG_REDGE);
++	fall = mtk_gpio_r32(rg, GPIO_REG_FEDGE);
++
++	spin_lock_irqsave(&rg->lock, flags);
++	mtk_gpio_w32(rg, GPIO_REG_FEDGE, fall & ~BIT(d->hwirq));
++	mtk_gpio_w32(rg, GPIO_REG_REDGE, rise & ~BIT(d->hwirq));
++	spin_unlock_irqrestore(&rg->lock, flags);
++}
++
++static int
++mediatek_gpio_irq_type(struct irq_data *d, unsigned int type)
++{
++	int pin = d->hwirq;
++	int bank = pin / 32;
++	struct mtk_gc *rg = gc_map[bank];
++	u32 mask = BIT(d->hwirq);
++
++	if (!rg)
++		return -1;
++
++	if (type == IRQ_TYPE_PROBE) {
++		if ((rg->rising | rg->falling) & mask)
++			return 0;
++
++		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
++	}
++
++	if (type & IRQ_TYPE_EDGE_RISING)
++		rg->rising |= mask;
++	else
++		rg->rising &= ~mask;
++
++	if (type & IRQ_TYPE_EDGE_FALLING)
++		rg->falling |= mask;
++	else
++		rg->falling &= ~mask;
++
++	return 0;
++}
++
++static struct irq_chip mediatek_gpio_irq_chip = {
++	.name		= "GPIO",
++	.irq_unmask	= mediatek_gpio_irq_unmask,
++	.irq_mask	= mediatek_gpio_irq_mask,
++	.irq_mask_ack	= mediatek_gpio_irq_mask,
++	.irq_set_type	= mediatek_gpio_irq_type,
++};
++
++static int
++mediatek_gpio_gpio_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
++{
++	irq_set_chip_and_handler(irq, &mediatek_gpio_irq_chip, handle_level_irq);
++	irq_set_handler_data(irq, d);
++
++	return 0;
++}
++
++static const struct irq_domain_ops irq_domain_ops = {
++	.xlate = irq_domain_xlate_onecell,
++	.map = mediatek_gpio_gpio_map,
++};
++
 +static int
 +mediatek_gpio_probe(struct platform_device *pdev)
 +{
 +	struct device_node *bank, *np = pdev->dev.of_node;
 +	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 +
-+	mtk_gc_membase = devm_ioremap_resource(&pdev->dev, res);
-+	if (IS_ERR(mtk_gc_membase))
-+		return PTR_ERR(mtk_gc_membase);
++	mediatek_gpio_membase = devm_ioremap_resource(&pdev->dev, res);
++	if (IS_ERR(mediatek_gpio_membase))
++		return PTR_ERR(mediatek_gpio_membase);
++
++	mediatek_gpio_irq = irq_of_parse_and_map(np, 0);
++	if (mediatek_gpio_irq) {
++		mediatek_gpio_irq_domain = irq_domain_add_linear(np,
++			MTK_MAX_BANK * MTK_BANK_WIDTH,
++			&irq_domain_ops, NULL);
++		if (!mediatek_gpio_irq_domain)
++			dev_err(&pdev->dev, "irq_domain_add_linear failed\n");
++	}
 +
 +	for_each_child_of_node(np, bank)
 +		if (of_device_is_compatible(bank, "mtk,mt7621-gpio-bank"))
 +			mediatek_gpio_bank_probe(pdev, bank);
 +
++	if (mediatek_gpio_irq_domain)
++		irq_set_chained_handler(mediatek_gpio_irq, mediatek_gpio_irq_handler);
++
 +	return 0;
 +}
 +