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openwrt/target/linux/atheros/patches-3.14/103-ar2315_gpio.patch
John Crispin cb5902d603 atheros: convert AR2315 GPIO code to platform driver 
Convert gpiolib realization to platform driver and move to the
appropriate subdirectory. Misc GPIO interrupt acknowledgement placed
to the MISC IRQ handler since in fact we can detect only one GPIO state
change.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

SVN-Revision: 42512
2014-09-12 06:54:10 +00:00

316 lines
8.5 KiB
Diff
Raw Blame History

--- a/arch/mips/ar231x/Kconfig
+++ b/arch/mips/ar231x/Kconfig
@@ -7,4 +7,5 @@ config SOC_AR5312
config SOC_AR2315
bool "Atheros 2315+ support"
depends on ATHEROS_AR231X
+ select GPIO_AR2315
default y
--- a/arch/mips/ar231x/ar2315.c
+++ b/arch/mips/ar231x/ar2315.c
@@ -212,6 +212,34 @@ static struct platform_device ar2315_wdt
.num_resources = ARRAY_SIZE(ar2315_wdt_res)
};
+static struct resource ar2315_gpio_res[] = {
+ {
+ .name = "ar2315-gpio",
+ .flags = IORESOURCE_MEM,
+ .start = AR2315_GPIO,
+ .end = AR2315_GPIO + 0x10 - 1,
+ },
+ {
+ .name = "ar2315-gpio",
+ .flags = IORESOURCE_IRQ,
+ .start = AR2315_MISC_IRQ_GPIO,
+ .end = AR2315_MISC_IRQ_GPIO,
+ },
+ {
+ .name = "ar2315-gpio-irq-base",
+ .flags = IORESOURCE_IRQ,
+ .start = AR231X_GPIO_IRQ_BASE,
+ .end = AR231X_GPIO_IRQ_BASE,
+ }
+};
+
+static struct platform_device ar2315_gpio = {
+ .id = -1,
+ .name = "ar2315-gpio",
+ .resource = ar2315_gpio_res,
+ .num_resources = ARRAY_SIZE(ar2315_gpio_res)
+};
+
/*
* NB: We use mapping size that is larger than the actual flash size,
* but this shouldn't be a problem here, because the flash will simply
@@ -277,6 +305,7 @@ ar2315_init_devices(void)
ar231x_find_config(ar2315_flash_limit());
ar2315_eth_data.macaddr = ar231x_board.config->enet0_mac;
+ platform_device_register(&ar2315_gpio);
ar2315_init_gpio_leds();
platform_device_register(&ar2315_wdt);
platform_device_register(&ar2315_spiflash);
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -108,6 +108,13 @@ config GPIO_MAX730X
comment "Memory mapped GPIO drivers:"
+config GPIO_AR2315
+ bool "AR2315 SoC GPIO support"
+ default y if SOC_AR2315
+ depends on SOC_AR2315
+ help
+ Say yes here to enable GPIO support for Atheros AR2315+ SoCs.
+
config GPIO_AR5312
bool "AR5312 SoC GPIO support"
default y if SOC_AR5312
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
+obj-$(CONFIG_GPIO_AR2315) += gpio-ar2315.o
obj-$(CONFIG_GPIO_AR5312) += gpio-ar5312.o
obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
--- /dev/null
+++ b/drivers/gpio/gpio-ar2315.c
@@ -0,0 +1,233 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved.
+ * Copyright (C) 2006 FON Technology, SL.
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2012 Alexandros C. Couloumbis <alex@ozo.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+
+#define DRIVER_NAME "ar2315-gpio"
+
+#define AR2315_GPIO_DI 0x0000
+#define AR2315_GPIO_DO 0x0008
+#define AR2315_GPIO_DIR 0x0010
+#define AR2315_GPIO_INT 0x0018
+
+#define AR2315_GPIO_DIR_M(x) (1 << (x)) /* mask for i/o */
+#define AR2315_GPIO_DIR_O(x) (1 << (x)) /* output */
+#define AR2315_GPIO_DIR_I(x) (0) /* input */
+
+#define AR2315_GPIO_INT_NUM_M 0x3F /* mask for GPIO num */
+#define AR2315_GPIO_INT_TRIG(x) ((x) << 6) /* interrupt trigger */
+#define AR2315_GPIO_INT_TRIG_M (0x3 << 6) /* mask for int trig */
+
+#define AR2315_GPIO_INT_TRIG_OFF 0 /* Triggerring off */
+#define AR2315_GPIO_INT_TRIG_LOW 1 /* Low Level Triggered */
+#define AR2315_GPIO_INT_TRIG_HIGH 2 /* High Level Triggered */
+#define AR2315_GPIO_INT_TRIG_EDGE 3 /* Edge Triggered */
+
+#define AR2315_GPIO_NUM 22
+
+static u32 ar2315_gpio_intmask;
+static u32 ar2315_gpio_intval;
+static unsigned ar2315_gpio_irq_base;
+static void __iomem *ar2315_mem;
+
+static inline u32 ar2315_gpio_reg_read(unsigned reg)
+{
+ return __raw_readl(ar2315_mem + reg);
+}
+
+static inline void ar2315_gpio_reg_write(unsigned reg, u32 val)
+{
+ __raw_writel(val, ar2315_mem + reg);
+}
+
+static inline void ar2315_gpio_reg_mask(unsigned reg, u32 mask, u32 val)
+{
+ ar2315_gpio_reg_write(reg, (ar2315_gpio_reg_read(reg) & ~mask) | val);
+}
+
+static void ar2315_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ u32 pend;
+ int bit = -1;
+
+ /* only do one gpio interrupt at a time */
+ pend = ar2315_gpio_reg_read(AR2315_GPIO_DI);
+ pend ^= ar2315_gpio_intval;
+ pend &= ar2315_gpio_intmask;
+
+ if (pend) {
+ bit = fls(pend) - 1;
+ pend &= ~(1 << bit);
+ ar2315_gpio_intval ^= (1 << bit);
+ }
+
+ /* Enable interrupt with edge detection */
+ if ((ar2315_gpio_reg_read(AR2315_GPIO_DIR) & AR2315_GPIO_DIR_M(bit)) !=
+ AR2315_GPIO_DIR_I(bit))
+ return;
+
+ if (bit >= 0)
+ generic_handle_irq(ar2315_gpio_irq_base + bit);
+}
+
+static void ar2315_gpio_int_setup(unsigned gpio, int trig)
+{
+ u32 reg = ar2315_gpio_reg_read(AR2315_GPIO_INT);
+
+ reg &= ~(AR2315_GPIO_INT_NUM_M | AR2315_GPIO_INT_TRIG_M);
+ reg |= gpio | AR2315_GPIO_INT_TRIG(trig);
+ ar2315_gpio_reg_write(AR2315_GPIO_INT, reg);
+}
+
+static void ar2315_gpio_irq_unmask(struct irq_data *d)
+{
+ unsigned gpio = d->irq - ar2315_gpio_irq_base;
+ u32 dir = ar2315_gpio_reg_read(AR2315_GPIO_DIR);
+
+ /* Enable interrupt with edge detection */
+ if ((dir & AR2315_GPIO_DIR_M(gpio)) != AR2315_GPIO_DIR_I(gpio))
+ return;
+
+ ar2315_gpio_intmask |= (1 << gpio);
+ ar2315_gpio_int_setup(gpio, AR2315_GPIO_INT_TRIG_EDGE);
+}
+
+static void ar2315_gpio_irq_mask(struct irq_data *d)
+{
+ unsigned gpio = d->irq - ar2315_gpio_irq_base;
+
+ /* Disable interrupt */
+ ar2315_gpio_intmask &= ~(1 << gpio);
+ ar2315_gpio_int_setup(gpio, AR2315_GPIO_INT_TRIG_OFF);
+}
+
+static struct irq_chip ar2315_gpio_irq_chip = {
+ .name = DRIVER_NAME,
+ .irq_unmask = ar2315_gpio_irq_unmask,
+ .irq_mask = ar2315_gpio_irq_mask,
+};
+
+static void ar2315_gpio_irq_init(unsigned irq)
+{
+ unsigned i;
+
+ ar2315_gpio_intval = ar2315_gpio_reg_read(AR2315_GPIO_DI);
+ for (i = 0; i < AR2315_GPIO_NUM; i++) {
+ unsigned _irq = ar2315_gpio_irq_base + i;
+
+ irq_set_chip_and_handler(_irq, &ar2315_gpio_irq_chip,
+ handle_level_irq);
+ }
+ irq_set_chained_handler(irq, ar2315_gpio_irq_handler);
+}
+
+static int ar2315_gpio_get_val(struct gpio_chip *chip, unsigned gpio)
+{
+ return (ar2315_gpio_reg_read(AR2315_GPIO_DI) >> gpio) & 1;
+}
+
+static void ar2315_gpio_set_val(struct gpio_chip *chip, unsigned gpio, int val)
+{
+ u32 reg = ar2315_gpio_reg_read(AR2315_GPIO_DO);
+
+ reg = val ? reg | (1 << gpio) : reg & ~(1 << gpio);
+ ar2315_gpio_reg_write(AR2315_GPIO_DO, reg);
+}
+
+static int ar2315_gpio_dir_in(struct gpio_chip *chip, unsigned gpio)
+{
+ ar2315_gpio_reg_mask(AR2315_GPIO_DIR, 1 << gpio, 0);
+ return 0;
+}
+
+static int ar2315_gpio_dir_out(struct gpio_chip *chip, unsigned gpio, int val)
+{
+ ar2315_gpio_reg_mask(AR2315_GPIO_DIR, 0, 1 << gpio);
+ ar2315_gpio_set_val(chip, gpio, val);
+ return 0;
+}
+
+static int ar2315_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
+{
+ return ar2315_gpio_irq_base + gpio;
+}
+
+static struct gpio_chip ar2315_gpio_chip = {
+ .label = DRIVER_NAME,
+ .direction_input = ar2315_gpio_dir_in,
+ .direction_output = ar2315_gpio_dir_out,
+ .set = ar2315_gpio_set_val,
+ .get = ar2315_gpio_get_val,
+ .to_irq = ar2315_gpio_to_irq,
+ .base = 0,
+ .ngpio = AR2315_GPIO_NUM,
+};
+
+static int ar2315_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ unsigned irq;
+ int ret;
+
+ if (ar2315_mem)
+ return -EBUSY;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
+ "ar2315-gpio-irq-base");
+ if (!res) {
+ dev_err(dev, "not found GPIO IRQ base\n");
+ return -ENXIO;
+ }
+ ar2315_gpio_irq_base = res->start;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, DRIVER_NAME);
+ if (!res) {
+ dev_err(dev, "not found IRQ number\n");
+ return -ENXIO;
+ }
+ irq = res->start;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, DRIVER_NAME);
+ ar2315_mem = devm_ioremap_resource(dev, res);
+ if (IS_ERR(ar2315_mem))
+ return PTR_ERR(ar2315_mem);
+
+ ar2315_gpio_chip.dev = dev;
+ ret = gpiochip_add(&ar2315_gpio_chip);
+ if (ret) {
+ dev_err(dev, "failed to add gpiochip\n");
+ return ret;
+ }
+
+ ar2315_gpio_irq_init(irq);
+
+ return 0;
+}
+
+static struct platform_driver ar2315_gpio_driver = {
+ .probe = ar2315_gpio_probe,
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ }
+};
+
+static int __init ar2315_gpio_init(void)
+{
+ return platform_driver_register(&ar2315_gpio_driver);
+}
+subsys_initcall(ar2315_gpio_init);
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