From: Felix Fietkau <nbd@nbd.name>
To: Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <brgl@bgdev.pl>
Cc: soc@kernel.org, linux-mediatek@lists.infradead.org,
linux-arm-kernel@lists.infradead.org, john@phrozen.org,
Andy Shevchenko <andy.shevchenko@gmail.com>,
linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org
Subject: [PATCH v9 12/13] gpio: Add support for Airoha EN7523 GPIO controller
Date: Sun, 30 Jan 2022 15:51:15 +0100 [thread overview]
Message-ID: <20220130145116.88406-13-nbd@nbd.name> (raw)
In-Reply-To: <20220130145116.88406-1-nbd@nbd.name>
From: John Crispin <john@phrozen.org>
Airoha's GPIO controller on their ARM EN7523 SoCs consists of two banks of 32
GPIOs. Each instance in DT is for a single bank.
Acked-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
drivers/gpio/Kconfig | 10 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-en7523.c | 137 +++++++++++++++++++++++++++++++++++++
3 files changed, 148 insertions(+)
create mode 100644 drivers/gpio/gpio-en7523.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 60d9374c72c0..0e9aacbcb4bd 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -247,6 +247,16 @@ config GPIO_EM
help
Say yes here to support GPIO on Renesas Emma Mobile SoCs.
+config GPIO_EN7523
+ tristate "Airoha GPIO support"
+ depends on ARCH_AIROHA
+ default ARCH_AIROHA
+ select GPIO_GENERIC
+ select GPIOLIB_IRQCHIP
+ help
+ Say Y or M here to support the GPIO controller block on the
+ Airoha EN7523 SoC. It supports two banks of 32 GPIOs.
+
config GPIO_EP93XX
def_bool y
depends on ARCH_EP93XX
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 71ee9fc2ff83..d2269ee0948e 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -56,6 +56,7 @@ obj-$(CONFIG_GPIO_DLN2) += gpio-dln2.o
obj-$(CONFIG_GPIO_DWAPB) += gpio-dwapb.o
obj-$(CONFIG_GPIO_EIC_SPRD) += gpio-eic-sprd.o
obj-$(CONFIG_GPIO_EM) += gpio-em.o
+obj-$(CONFIG_GPIO_EN7523) += gpio-en7523.o
obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o
obj-$(CONFIG_GPIO_EXAR) += gpio-exar.o
obj-$(CONFIG_GPIO_F7188X) += gpio-f7188x.o
diff --git a/drivers/gpio/gpio-en7523.c b/drivers/gpio/gpio-en7523.c
new file mode 100644
index 000000000000..f836a8db4c1d
--- /dev/null
+++ b/drivers/gpio/gpio-en7523.c
@@ -0,0 +1,137 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/types.h>
+#include <linux/io.h>
+#include <linux/bits.h>
+#include <linux/gpio/driver.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#define AIROHA_GPIO_MAX 32
+
+/**
+ * airoha_gpio_ctrl - Airoha GPIO driver data
+ * @gc: Associated gpio_chip instance.
+ * @data: The data register.
+ * @dir0: The direction register for the lower 16 pins.
+ * @dir1: The direction register for the higher 16 pins.
+ * @output: The output enable register.
+ */
+struct airoha_gpio_ctrl {
+ struct gpio_chip gc;
+ void __iomem *data;
+ void __iomem *dir[2];
+ void __iomem *output;
+};
+
+static struct airoha_gpio_ctrl *gc_to_ctrl(struct gpio_chip *gc)
+{
+ return container_of(gc, struct airoha_gpio_ctrl, gc);
+}
+
+static int airoha_dir_set(struct gpio_chip *gc, unsigned int gpio,
+ int val, int out)
+{
+ struct airoha_gpio_ctrl *ctrl = gc_to_ctrl(gc);
+ u32 dir = ioread32(ctrl->dir[gpio / 16]);
+ u32 output = ioread32(ctrl->output);
+ u32 mask = BIT((gpio % 16) * 2);
+
+ if (out) {
+ dir |= mask;
+ output |= BIT(gpio);
+ } else {
+ dir &= ~mask;
+ output &= ~BIT(gpio);
+ }
+
+ iowrite32(dir, ctrl->dir[gpio / 16]);
+
+ if (out)
+ gc->set(gc, gpio, val);
+
+ iowrite32(output, ctrl->output);
+
+ return 0;
+}
+
+static int airoha_dir_out(struct gpio_chip *gc, unsigned int gpio,
+ int val)
+{
+ return airoha_dir_set(gc, gpio, val, 1);
+}
+
+static int airoha_dir_in(struct gpio_chip *gc, unsigned int gpio)
+{
+ return airoha_dir_set(gc, gpio, 0, 0);
+}
+
+static int airoha_get_dir(struct gpio_chip *gc, unsigned int gpio)
+{
+ struct airoha_gpio_ctrl *ctrl = gc_to_ctrl(gc);
+ u32 dir = ioread32(ctrl->dir[gpio / 16]);
+ u32 mask = BIT((gpio % 16) * 2);
+
+ return (dir & mask) ? GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
+}
+
+static int airoha_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct airoha_gpio_ctrl *ctrl;
+ int err;
+
+ ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
+ if (!ctrl)
+ return -ENOMEM;
+
+ ctrl->data = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(ctrl->data))
+ return PTR_ERR(ctrl->data);
+
+ ctrl->dir[0] = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(ctrl->dir[0]))
+ return PTR_ERR(ctrl->dir[0]);
+
+ ctrl->dir[1] = devm_platform_ioremap_resource(pdev, 2);
+ if (IS_ERR(ctrl->dir[1]))
+ return PTR_ERR(ctrl->dir[1]);
+
+ ctrl->output = devm_platform_ioremap_resource(pdev, 3);
+ if (IS_ERR(ctrl->output))
+ return PTR_ERR(ctrl->output);
+
+ err = bgpio_init(&ctrl->gc, dev, 4, ctrl->data, NULL,
+ NULL, NULL, NULL, 0);
+ if (err)
+ return dev_err_probe(dev, err, "unable to init generic GPIO");
+
+ ctrl->gc.ngpio = AIROHA_GPIO_MAX;
+ ctrl->gc.owner = THIS_MODULE;
+ ctrl->gc.direction_output = airoha_dir_out;
+ ctrl->gc.direction_input = airoha_dir_in;
+ ctrl->gc.get_direction = airoha_get_dir;
+
+ return devm_gpiochip_add_data(dev, &ctrl->gc, ctrl);
+}
+
+static const struct of_device_id airoha_gpio_of_match[] = {
+ { .compatible = "airoha,en7523-gpio" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, airoha_gpio_of_match);
+
+static struct platform_driver airoha_gpio_driver = {
+ .driver = {
+ .name = "airoha-gpio",
+ .of_match_table = airoha_gpio_of_match,
+ },
+ .probe = airoha_gpio_probe,
+};
+module_platform_driver(airoha_gpio_driver);
+
+MODULE_DESCRIPTION("Airoha GPIO support");
+MODULE_AUTHOR("John Crispin <john@phrozen.org>");
+MODULE_LICENSE("GPL v2");
--
2.32.0 (Apple Git-132)
next prev parent reply other threads:[~2022-01-30 14:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20220130145116.88406-1-nbd@nbd.name>
2022-01-30 14:51 ` [PATCH v9 01/13] dt-bindings: Add vendor prefix for Airoha Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 02/13] dt-bindings: arm: airoha: Add binding for EN7523 SoC and EVB Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 03/13] ARM: Add basic support for Airoha EN7523 SoC Felix Fietkau
2022-01-31 10:51 ` Luka Perkov
2022-01-31 12:57 ` Felix Fietkau
2022-01-31 13:00 ` Robert Marko
2022-01-31 13:12 ` John Crispin
2022-01-30 14:51 ` [PATCH v9 04/13] ARM: multi_v7_defconfig: Add " Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 05/13] dt-bindings: Add en7523-scu device tree binding documentation Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 06/13] clk: en7523: Add clock driver for Airoha EN7523 SoC Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 07/13] ARM: dts: add clock support for Airoha EN7523 Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 08/13] dt-bindings: PCI: Add support for Airoha EN7532 Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 09/13] PCI: mediatek: Allow building for ARCH_AIROHA Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 10/13] ARM: dts: Add PCIe support for Airoha EN7523 Felix Fietkau
2022-01-30 14:51 ` [PATCH v9 11/13] dt-bindings: arm: airoha: Add binding for Airoha GPIO controller Felix Fietkau
2022-02-02 9:16 ` Bartosz Golaszewski
2022-01-30 14:51 ` Felix Fietkau [this message]
2022-01-31 11:13 ` [PATCH v9 12/13] gpio: Add support for Airoha EN7523 " Linus Walleij
2022-02-02 9:17 ` Bartosz Golaszewski
2022-01-30 14:51 ` [PATCH v9 13/13] ARM: dts: add GPIO support for Airoha EN7523 Felix Fietkau
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