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Message-Id: <1325508798-25439-2-git-send-email-jamie@jamieiles.com>
Date: Mon, 2 Jan 2012 12:53:16 +0000
From: Jamie Iles <jamie@...ieiles.com>
To: linux-kernel@...r.kernel.org
Cc: devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
linus.walleij@...ricsson.com, robherring2@...il.com,
Jamie Iles <jamie@...ieiles.com>
Subject: [PATCHv3 1/3] gpio: add a driver for the Synopsys DesignWare APB GPIO block
The Synopsys DesignWare block is used in some ARM devices (picoxcell)
and can be configured to provide multiple banks of GPIO pins.
v3: - depend on rather than select IRQ_DOMAIN
- split IRQ support into a separate patch
v2: - use Rob Herring's irqdomain in generic irq chip patches
- use reg property to indicate bank index
- support irqs on both edges based on LinusW's u300 driver
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Linus Walleij <linus.walleij@...ricsson.com>
Acked-by: Rob Herring <rob.herring@...xeda.com>
Signed-off-by: Jamie Iles <jamie@...ieiles.com>
---
.../devicetree/bindings/gpio/snps-dwapb-gpio.txt | 63 +++++++
drivers/gpio/Kconfig | 9 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-dwapb.c | 170 ++++++++++++++++++++
4 files changed, 243 insertions(+), 0 deletions(-)
create mode 100644 Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
create mode 100644 drivers/gpio/gpio-dwapb.c
diff --git a/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
new file mode 100644
index 0000000..dccc113
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
@@ -0,0 +1,63 @@
+* Synopsys DesignWare APB GPIO controller
+
+Required properties:
+- compatible : Should be "snps,dw-apb-gpio"
+- reg : Address and length of the register set for the device
+
+The GPIO controller has a configurable number of banks, each of which are
+represented as child nodes with the following properties:
+
+Required properties:
+- compatible : "snps,dw-apb-gpio-bank"
+- gpio-controller : Marks the device node as a gpio controller.
+- #gpio-cells : Should be two. The first cell is the pin number and
+ the second cell is used to specify optional parameters (currently
+ unused).
+- reg : The integer bank index of the bank, a single cell.
+- nr-gpio : The number of pins in the bank, a single cell.
+
+Optional properties:
+- interrupt-controller : The first bank may be configured to be an interrupt
+controller.
+- #interrupt-cells : Specifies the number of cells needed to encode an
+interrupt. Shall be set to 2. The first cell defines the interrupt number,
+the second encodes the triger flags encoded as:
+
+ bits[3:0] trigger type and level flags.
+ 1 = low-to-high edge triggered
+ 2 = high-to-low edge triggered
+ 4 = active high level-sensitive
+ 8 = active low level-sensitive
+
+- interrupt-parent : The parent interrupt controller.
+- interrupts : The interrupts to the parent controller raised when GPIOs
+generate the interrupts.
+
+Example:
+
+gpio: gpio@...00 {
+ compatible = "snps,dw-apb-gpio";
+ reg = <0x20000 0x1000>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ banka: gpio-controller@0 {
+ compatible = "snps,dw-apb-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ nr-gpio = <8>;
+ reg = <0>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ interrupt-parent = <&vic1>;
+ interrupts = <0 1 2 3 4 5 6 7>;
+ };
+
+ bankb: gpio-controller@1 {
+ compatible = "snps,dw-apb-gpio-bank";
+ gpio-controller;
+ #gpio-cells = <2>;
+ nr-gpio = <8>;
+ reg = <1>;
+ };
+};
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8482a23..a82f61e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -85,6 +85,15 @@ config GPIO_GENERIC_PLATFORM
help
Say yes here to support basic platform_device memory-mapped GPIO controllers.
+config GPIO_DWAPB
+ bool "Synopsys DesignWare APB GPIO driver"
+ select GPIO_GENERIC
+ select GENERIC_IRQ_CHIP
+ depends on OF_GPIO
+ help
+ Say Y or M here to build support for the Synopsys DesignWare APB
+ GPIO block. This requires device tree support.
+
config GPIO_IT8761E
tristate "IT8761E GPIO support"
help
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index dbcb0bc..22665a0 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
obj-$(CONFIG_ARCH_DAVINCI) += gpio-davinci.o
+obj-$(CONFIG_GPIO_DWAPB) += gpio-dwapb.o
obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o
obj-$(CONFIG_GPIO_IT8761E) += gpio-it8761e.o
obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
new file mode 100644
index 0000000..fb98274
--- /dev/null
+++ b/drivers/gpio/gpio-dwapb.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2011 Jamie Iles
+ *
+ * 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 by the Free Software Foundation.
+ *
+ * All enquiries to support@...ochip.com
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/basic_mmio_gpio.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+
+struct dwapb_gpio;
+
+struct dwapb_gpio_bank {
+ struct bgpio_chip bgc;
+ unsigned int bank_idx;
+ bool is_registered;
+ struct dwapb_gpio *gpio;
+};
+
+struct dwapb_gpio {
+ struct device_node *of_node;
+ struct device *dev;
+ void __iomem *regs;
+ struct dwapb_gpio_bank *banks;
+ unsigned int nr_banks;
+};
+
+static unsigned int dwapb_gpio_nr_banks(struct device_node *of_node)
+{
+ unsigned int nr_banks = 0;
+ struct device_node *np;
+
+ for_each_child_of_node(of_node, np)
+ ++nr_banks;
+
+ return nr_banks;
+}
+
+static int dwapb_gpio_add_bank(struct dwapb_gpio *gpio,
+ struct device_node *bank_np)
+{
+ struct dwapb_gpio_bank *bank;
+ u32 bank_idx, ngpio;
+ int err;
+
+ if (of_property_read_u32(bank_np, "reg", &bank_idx)) {
+ dev_err(gpio->dev, "invalid bank index for %s\n",
+ bank_np->full_name);
+ return -EINVAL;
+ }
+ bank = &gpio->banks[bank_idx];
+ bank->gpio = gpio;
+
+ if (of_property_read_u32(bank_np, "nr-gpio", &ngpio)) {
+ dev_err(gpio->dev, "failed to get number of gpios for %s\n",
+ bank_np->full_name);
+ return -EINVAL;
+ }
+
+ bank->bank_idx = bank_idx;
+ err = bgpio_init(&bank->bgc, gpio->dev, 4,
+ gpio->regs + 0x50 + (bank_idx * 0x4),
+ gpio->regs + 0x00 + (bank_idx * 0xc),
+ NULL, gpio->regs + 0x04 + (bank_idx * 0xc), NULL,
+ false);
+ if (err) {
+ dev_err(gpio->dev, "failed to init gpio chip for %s\n",
+ bank_np->full_name);
+ return err;
+ }
+
+ bank->bgc.gc.ngpio = ngpio;
+ bank->bgc.gc.of_node = bank_np;
+
+ err = gpiochip_add(&bank->bgc.gc);
+ if (err)
+ dev_err(gpio->dev, "failed to register gpiochip for %s\n",
+ bank_np->full_name);
+ else
+ bank->is_registered = true;
+
+ return err;
+}
+
+static void dwapb_gpio_unregister(struct dwapb_gpio *gpio)
+{
+ unsigned int m;
+
+ for (m = 0; m < gpio->nr_banks; ++m)
+ if (gpio->banks[m].is_registered)
+ WARN_ON(gpiochip_remove(&gpio->banks[m].bgc.gc));
+ of_node_put(gpio->of_node);
+}
+
+static int __devinit dwapb_gpio_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct dwapb_gpio *gpio;
+ struct device_node *np;
+ int err;
+
+ gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+ if (!gpio)
+ return -ENOMEM;
+ gpio->dev = &pdev->dev;
+
+ gpio->nr_banks = dwapb_gpio_nr_banks(pdev->dev.of_node);
+ if (!gpio->nr_banks)
+ return -EINVAL;
+ gpio->banks = devm_kzalloc(&pdev->dev, gpio->nr_banks *
+ sizeof(*gpio->banks), GFP_KERNEL);
+ if (!gpio->banks)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "failed to get iomem\n");
+ return -ENXIO;
+ }
+ gpio->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+ if (!gpio->regs)
+ return -ENOMEM;
+
+ gpio->of_node = of_node_get(pdev->dev.of_node);
+ for_each_child_of_node(pdev->dev.of_node, np) {
+ err = dwapb_gpio_add_bank(gpio, np);
+ if (err)
+ goto out_unregister;
+ }
+ platform_set_drvdata(pdev, gpio);
+
+ return 0;
+
+out_unregister:
+ dwapb_gpio_unregister(gpio);
+
+ return err;
+}
+
+static const struct of_device_id dwapb_of_match_table[] = {
+ { .compatible = "snps,dw-apb-gpio" },
+ { /* Sentinel */ }
+};
+
+static struct platform_driver dwapb_gpio_driver = {
+ .driver = {
+ .name = "gpio-dwapb",
+ .owner = THIS_MODULE,
+ .of_match_table = dwapb_of_match_table,
+ },
+ .probe = dwapb_gpio_probe,
+};
+
+static int __init dwapb_gpio_init(void)
+{
+ return platform_driver_register(&dwapb_gpio_driver);
+}
+postcore_initcall(dwapb_gpio_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamie Iles");
+MODULE_DESCRIPTION("Synopsys DesignWare APB GPIO driver");
--
1.7.5.4
--
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