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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-07 19:57:51 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-07 19:57:51 +0200
commita8c4b90e670be3b01e9395c7310639c8109fc77e (patch)
tree272f7988aeeaf930efd594f66c1a41a7d28ecd74 /drivers/gpio
parentMerge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost (diff)
parentMerge tag 'renesas-boards-lager-for-v3.10' of git://git.kernel.org/pub/scm/li... (diff)
downloadlinux-a8c4b90e670be3b01e9395c7310639c8109fc77e.tar.xz
linux-a8c4b90e670be3b01e9395c7310639c8109fc77e.zip
Merge tag 'soc-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC platform updates (part 2) from Arnd Bergmann: "These patches are all for Renesas shmobile, and depend on the earlier pinctrl updates. Remarkably, this adds support for three new SoCs: r8a73a4, r8a73a4 and r8a7778. The bulk of the code added for these is for pinctrl (using the new subsystem) and for clocks (not yet using the common clock subsystem). The latter will have to get converted in one of the upcoming releases, but shmobile is not ready for that yet. The series also contains Renesas shmobile board changes, adding one board file for each of the three new SoCs. These boards are using a mix of classic and device-tree based probing, as there is still a lot of infrastructure in shmobile that has not been converted to DT yet. Once those are resolved to the degree that no board specific setup code is needed, they can get folded into the respective SoC setup files." * tag 'soc-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (78 commits) ARM: shmobile: use r8a7790 timer setup code on Lager ARM: shmobile: force enable of r8a7790 arch timer ARM: shmobile: Add second I/O range for r8a7790 PFC ARM: shmobile: bockw: enable network settings on bootargs ARM: shmobile: bockw: add SMSC ethernet support ARM: shmobile: R8A7778: add Ether support ARM: shmobile: bockw: enable SMSC ethernet on defconfig ARM: shmobile: r8a7778: add r8a7778_init_irq_extpin() ARM: shmobile: r8a7778: remove pointless PLATFORM_INFO() ARM: shmobile: mackerel: clean up MMCIF vs. SDHI1 selection ARM: shmobile: mackerel: add interrupt names for SDHI0 ARM: shmobile: mackerel: switch SDHI and MMCIF interfaces to slot-gpio ARM: shmobile: mackerel: remove OCR masks, where regulators are used ARM: shmobile: mackerel: SDHI resources do not have to be numbered ARM: shmobile: Initial r8a7790 Lager board support ARM: shmobile: APE6EVM LAN9220 support ARM: shmobile: APE6EVM PFC support ARM: shmobile: APE6EVM base support ARM: shmobile: kzm9g-reference: add ethernet support ARM: shmobile: add R-Car M1A Bock-W platform support ...
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/Kconfig6
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/gpio-rcar.c396
3 files changed, 403 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index ff7f0c87745a..c22eed9481e3 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -204,6 +204,12 @@ config GPIO_PXA
help
Say yes here to support the PXA GPIO device
+config GPIO_RCAR
+ tristate "Renesas R-Car GPIO"
+ depends on ARM
+ help
+ Say yes here to support GPIO on Renesas R-Car SoCs.
+
config GPIO_SPEAR_SPICS
bool "ST SPEAr13xx SPI Chip Select as GPIO support"
depends on PLAT_SPEAR
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 6aab73d577d1..0cb2d656ad16 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
+obj-$(CONFIG_GPIO_RCAR) += gpio-rcar.o
obj-$(CONFIG_PLAT_SAMSUNG) += gpio-samsung.o
obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o
obj-$(CONFIG_GPIO_SCH) += gpio-sch.o
diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
new file mode 100644
index 000000000000..b4ca450947b8
--- /dev/null
+++ b/drivers/gpio/gpio-rcar.c
@@ -0,0 +1,396 @@
+/*
+ * Renesas R-Car GPIO Support
+ *
+ * Copyright (C) 2013 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_data/gpio-rcar.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+
+struct gpio_rcar_priv {
+ void __iomem *base;
+ spinlock_t lock;
+ struct gpio_rcar_config config;
+ struct platform_device *pdev;
+ struct gpio_chip gpio_chip;
+ struct irq_chip irq_chip;
+ struct irq_domain *irq_domain;
+};
+
+#define IOINTSEL 0x00
+#define INOUTSEL 0x04
+#define OUTDT 0x08
+#define INDT 0x0c
+#define INTDT 0x10
+#define INTCLR 0x14
+#define INTMSK 0x18
+#define MSKCLR 0x1c
+#define POSNEG 0x20
+#define EDGLEVEL 0x24
+#define FILONOFF 0x28
+
+static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs)
+{
+ return ioread32(p->base + offs);
+}
+
+static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs,
+ u32 value)
+{
+ iowrite32(value, p->base + offs);
+}
+
+static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs,
+ int bit, bool value)
+{
+ u32 tmp = gpio_rcar_read(p, offs);
+
+ if (value)
+ tmp |= BIT(bit);
+ else
+ tmp &= ~BIT(bit);
+
+ gpio_rcar_write(p, offs, tmp);
+}
+
+static void gpio_rcar_irq_disable(struct irq_data *d)
+{
+ struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
+
+ gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d)));
+}
+
+static void gpio_rcar_irq_enable(struct irq_data *d)
+{
+ struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
+
+ gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d)));
+}
+
+static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p,
+ unsigned int hwirq,
+ bool active_high_rising_edge,
+ bool level_trigger)
+{
+ unsigned long flags;
+
+ /* follow steps in the GPIO documentation for
+ * "Setting Edge-Sensitive Interrupt Input Mode" and
+ * "Setting Level-Sensitive Interrupt Input Mode"
+ */
+
+ spin_lock_irqsave(&p->lock, flags);
+
+ /* Configure postive or negative logic in POSNEG */
+ gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge);
+
+ /* Configure edge or level trigger in EDGLEVEL */
+ gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger);
+
+ /* Select "Interrupt Input Mode" in IOINTSEL */
+ gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true);
+
+ /* Write INTCLR in case of edge trigger */
+ if (!level_trigger)
+ gpio_rcar_write(p, INTCLR, BIT(hwirq));
+
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type)
+{
+ struct gpio_rcar_priv *p = irq_data_get_irq_chip_data(d);
+ unsigned int hwirq = irqd_to_hwirq(d);
+
+ dev_dbg(&p->pdev->dev, "sense irq = %d, type = %d\n", hwirq, type);
+
+ switch (type & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true);
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true);
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false);
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false);
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id)
+{
+ struct gpio_rcar_priv *p = dev_id;
+ u32 pending;
+ unsigned int offset, irqs_handled = 0;
+
+ while ((pending = gpio_rcar_read(p, INTDT))) {
+ offset = __ffs(pending);
+ gpio_rcar_write(p, INTCLR, BIT(offset));
+ generic_handle_irq(irq_find_mapping(p->irq_domain, offset));
+ irqs_handled++;
+ }
+
+ return irqs_handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static inline struct gpio_rcar_priv *gpio_to_priv(struct gpio_chip *chip)
+{
+ return container_of(chip, struct gpio_rcar_priv, gpio_chip);
+}
+
+static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip,
+ unsigned int gpio,
+ bool output)
+{
+ struct gpio_rcar_priv *p = gpio_to_priv(chip);
+ unsigned long flags;
+
+ /* follow steps in the GPIO documentation for
+ * "Setting General Output Mode" and
+ * "Setting General Input Mode"
+ */
+
+ spin_lock_irqsave(&p->lock, flags);
+
+ /* Configure postive logic in POSNEG */
+ gpio_rcar_modify_bit(p, POSNEG, gpio, false);
+
+ /* Select "General Input/Output Mode" in IOINTSEL */
+ gpio_rcar_modify_bit(p, IOINTSEL, gpio, false);
+
+ /* Select Input Mode or Output Mode in INOUTSEL */
+ gpio_rcar_modify_bit(p, INOUTSEL, gpio, output);
+
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset)
+{
+ return pinctrl_request_gpio(chip->base + offset);
+}
+
+static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset)
+{
+ pinctrl_free_gpio(chip->base + offset);
+
+ /* Set the GPIO as an input to ensure that the next GPIO request won't
+ * drive the GPIO pin as an output.
+ */
+ gpio_rcar_config_general_input_output_mode(chip, offset, false);
+}
+
+static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ gpio_rcar_config_general_input_output_mode(chip, offset, false);
+ return 0;
+}
+
+static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset)
+{
+ return (int)(gpio_rcar_read(gpio_to_priv(chip), INDT) & BIT(offset));
+}
+
+static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct gpio_rcar_priv *p = gpio_to_priv(chip);
+ unsigned long flags;
+
+ spin_lock_irqsave(&p->lock, flags);
+ gpio_rcar_modify_bit(p, OUTDT, offset, value);
+ spin_unlock_irqrestore(&p->lock, flags);
+}
+
+static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ /* write GPIO value to output before selecting output mode of pin */
+ gpio_rcar_set(chip, offset, value);
+ gpio_rcar_config_general_input_output_mode(chip, offset, true);
+ return 0;
+}
+
+static int gpio_rcar_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ return irq_create_mapping(gpio_to_priv(chip)->irq_domain, offset);
+}
+
+static int gpio_rcar_irq_domain_map(struct irq_domain *h, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ struct gpio_rcar_priv *p = h->host_data;
+
+ dev_dbg(&p->pdev->dev, "map hw irq = %d, virq = %d\n", (int)hw, virq);
+
+ irq_set_chip_data(virq, h->host_data);
+ irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
+ set_irq_flags(virq, IRQF_VALID); /* kill me now */
+ return 0;
+}
+
+static struct irq_domain_ops gpio_rcar_irq_domain_ops = {
+ .map = gpio_rcar_irq_domain_map,
+};
+
+static int gpio_rcar_probe(struct platform_device *pdev)
+{
+ struct gpio_rcar_config *pdata = pdev->dev.platform_data;
+ struct gpio_rcar_priv *p;
+ struct resource *io, *irq;
+ struct gpio_chip *gpio_chip;
+ struct irq_chip *irq_chip;
+ const char *name = dev_name(&pdev->dev);
+ int ret;
+
+ p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+ if (!p) {
+ dev_err(&pdev->dev, "failed to allocate driver data\n");
+ ret = -ENOMEM;
+ goto err0;
+ }
+
+ /* deal with driver instance configuration */
+ if (pdata)
+ p->config = *pdata;
+
+ p->pdev = pdev;
+ platform_set_drvdata(pdev, p);
+ spin_lock_init(&p->lock);
+
+ io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+
+ if (!io || !irq) {
+ dev_err(&pdev->dev, "missing IRQ or IOMEM\n");
+ ret = -EINVAL;
+ goto err0;
+ }
+
+ p->base = devm_ioremap_nocache(&pdev->dev, io->start,
+ resource_size(io));
+ if (!p->base) {
+ dev_err(&pdev->dev, "failed to remap I/O memory\n");
+ ret = -ENXIO;
+ goto err0;
+ }
+
+ gpio_chip = &p->gpio_chip;
+ gpio_chip->request = gpio_rcar_request;
+ gpio_chip->free = gpio_rcar_free;
+ gpio_chip->direction_input = gpio_rcar_direction_input;
+ gpio_chip->get = gpio_rcar_get;
+ gpio_chip->direction_output = gpio_rcar_direction_output;
+ gpio_chip->set = gpio_rcar_set;
+ gpio_chip->to_irq = gpio_rcar_to_irq;
+ gpio_chip->label = name;
+ gpio_chip->owner = THIS_MODULE;
+ gpio_chip->base = p->config.gpio_base;
+ gpio_chip->ngpio = p->config.number_of_pins;
+
+ irq_chip = &p->irq_chip;
+ irq_chip->name = name;
+ irq_chip->irq_mask = gpio_rcar_irq_disable;
+ irq_chip->irq_unmask = gpio_rcar_irq_enable;
+ irq_chip->irq_enable = gpio_rcar_irq_enable;
+ irq_chip->irq_disable = gpio_rcar_irq_disable;
+ irq_chip->irq_set_type = gpio_rcar_irq_set_type;
+ irq_chip->flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_SET_TYPE_MASKED;
+
+ p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
+ p->config.number_of_pins,
+ p->config.irq_base,
+ &gpio_rcar_irq_domain_ops, p);
+ if (!p->irq_domain) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "cannot initialize irq domain\n");
+ goto err1;
+ }
+
+ if (devm_request_irq(&pdev->dev, irq->start,
+ gpio_rcar_irq_handler, 0, name, p)) {
+ dev_err(&pdev->dev, "failed to request IRQ\n");
+ ret = -ENOENT;
+ goto err1;
+ }
+
+ ret = gpiochip_add(gpio_chip);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add GPIO controller\n");
+ goto err1;
+ }
+
+ dev_info(&pdev->dev, "driving %d GPIOs\n", p->config.number_of_pins);
+
+ /* warn in case of mismatch if irq base is specified */
+ if (p->config.irq_base) {
+ ret = irq_find_mapping(p->irq_domain, 0);
+ if (p->config.irq_base != ret)
+ dev_warn(&pdev->dev, "irq base mismatch (%u/%u)\n",
+ p->config.irq_base, ret);
+ }
+
+ ret = gpiochip_add_pin_range(gpio_chip, p->config.pctl_name, 0,
+ gpio_chip->base, gpio_chip->ngpio);
+ if (ret < 0)
+ dev_warn(&pdev->dev, "failed to add pin range\n");
+
+ return 0;
+
+err1:
+ irq_domain_remove(p->irq_domain);
+err0:
+ return ret;
+}
+
+static int gpio_rcar_remove(struct platform_device *pdev)
+{
+ struct gpio_rcar_priv *p = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = gpiochip_remove(&p->gpio_chip);
+ if (ret)
+ return ret;
+
+ irq_domain_remove(p->irq_domain);
+ return 0;
+}
+
+static struct platform_driver gpio_rcar_device_driver = {
+ .probe = gpio_rcar_probe,
+ .remove = gpio_rcar_remove,
+ .driver = {
+ .name = "gpio_rcar",
+ }
+};
+
+module_platform_driver(gpio_rcar_device_driver);
+
+MODULE_AUTHOR("Magnus Damm");
+MODULE_DESCRIPTION("Renesas R-Car GPIO Driver");
+MODULE_LICENSE("GPL v2");