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Message-ID: <CAHp75VcA8G5gcdn+9_vU096xBa+8=8U0pJtUDObO-BrTiAbEwQ@mail.gmail.com>
Date: Wed, 28 Feb 2018 20:39:31 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Andreas Färber <afaerber@...e.de>,
刘炜 <liuwei@...ions-semi.com>,
mp-cs@...ions-semi.com, 96boards@...obotics.com,
devicetree <devicetree@...r.kernel.org>,
Daniel Thompson <daniel.thompson@...aro.org>,
amit.kucheria@...aro.org,
linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
"open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
hzhang@...obotics.com, bdong@...obotics.com,
manivannanece23@...il.com
Subject: Re: [PATCH v3 08/10] gpio: Add gpio driver for Actions OWL S900 SoC
On Wed, Feb 28, 2018 at 8:14 PM, Manivannan Sadhasivam
<manivannan.sadhasivam@...aro.org> wrote:
> Add gpio driver for Actions Semi OWL family S900 SoC. Set of registers
> controlling the gpio shares the same register range with pinctrl block.
>
> GPIO registers are organized as 6 banks and each bank controls the
> maximum of 32 gpios.
>
FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
P.S. Comma in terminator line is not needed.
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
> drivers/gpio/Kconfig | 8 ++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-owl.c | 218 ++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 227 insertions(+)
> create mode 100644 drivers/gpio/gpio-owl.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 8dbb2280538d..09ceb98e2434 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -364,6 +364,14 @@ config GPIO_OMAP
> help
> Say yes here to enable GPIO support for TI OMAP SoCs.
>
> +config GPIO_OWL
> + tristate "Actions OWL GPIO support"
> + default ARCH_ACTIONS
> + depends on ARCH_ACTIONS || COMPILE_TEST
> + depends on OF_GPIO
> + help
> + Say yes here to enable GPIO support for Actions OWL SoCs.
> +
> config GPIO_PL061
> bool "PrimeCell PL061 GPIO support"
> depends on ARM_AMBA
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index cccb0d40846c..b2bb11d4675f 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -91,6 +91,7 @@ obj-$(CONFIG_GPIO_MXC) += gpio-mxc.o
> obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o
> obj-$(CONFIG_GPIO_OCTEON) += gpio-octeon.o
> obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o
> +obj-$(CONFIG_GPIO_OWL) += gpio-owl.o
> obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o
> obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
> obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
> diff --git a/drivers/gpio/gpio-owl.c b/drivers/gpio/gpio-owl.c
> new file mode 100644
> index 000000000000..98f2e98197bc
> --- /dev/null
> +++ b/drivers/gpio/gpio-owl.c
> @@ -0,0 +1,218 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * OWL SoC's GPIO driver
> + *
> + * Copyright (c) 2018 Linaro Ltd.
> + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/err.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#define GPIO_OUTEN 0x0000
> +#define GPIO_INEN 0x0004
> +#define GPIO_DAT 0x0008
> +
> +#define OWL_GPIO_PORT_A 0
> +#define OWL_GPIO_PORT_B 1
> +#define OWL_GPIO_PORT_C 2
> +#define OWL_GPIO_PORT_D 3
> +#define OWL_GPIO_PORT_E 4
> +#define OWL_GPIO_PORT_F 5
> +
> +struct owl_gpio_port {
> + const char *name;
> + unsigned int offset;
> + unsigned int pins;
> +};
> +
> +struct owl_gpio {
> + struct gpio_chip gpio;
> + const struct owl_gpio_port *port;
> + void __iomem *base;
> + int id;
> +};
> +
> +static void owl_gpio_set_reg(void __iomem *base, unsigned int pin, int flag)
> +{
> + u32 val;
> +
> + val = readl_relaxed(base);
> +
> + if (flag)
> + val |= BIT(pin);
> + else
> + val &= ~BIT(pin);
> +
> + writel_relaxed(val, base);
> +}
> +
> +static int owl_gpio_request(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct owl_gpio *gpio = gpiochip_get_data(chip);
> + const struct owl_gpio_port *port = gpio->port;
> + void __iomem *gpio_base = gpio->base + port->offset;
> +
> + /*
> + * GPIOs have higher priority over other modules, so either setting
> + * them as OUT or IN is sufficient
> + */
> + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, true);
> +
> + return 0;
> +}
> +
> +static void owl_gpio_free(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct owl_gpio *gpio = gpiochip_get_data(chip);
> + const struct owl_gpio_port *port = gpio->port;
> + void __iomem *gpio_base = gpio->base + port->offset;
> +
> + /* disable gpio output */
> + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, false);
> +
> + /* disable gpio input */
> + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, false);
> +}
> +
> +static int owl_gpio_get(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct owl_gpio *gpio = gpiochip_get_data(chip);
> + const struct owl_gpio_port *port = gpio->port;
> + void __iomem *gpio_base = gpio->base + port->offset;
> + u32 val;
> +
> + val = readl_relaxed(gpio_base + GPIO_DAT);
> +
> + return !!(val & BIT(offset));
> +}
> +
> +static void owl_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
> +{
> + struct owl_gpio *gpio = gpiochip_get_data(chip);
> + const struct owl_gpio_port *port = gpio->port;
> + void __iomem *gpio_base = gpio->base + port->offset;
> + u32 val;
> +
> + val = readl_relaxed(gpio_base + GPIO_DAT);
> +
> + if (value)
> + val |= BIT(offset);
> + else
> + val &= ~BIT(offset);
> +
> + writel_relaxed(val, gpio_base + GPIO_DAT);
> +}
> +
> +static int owl_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
> +{
> + struct owl_gpio *gpio = gpiochip_get_data(chip);
> + const struct owl_gpio_port *port = gpio->port;
> + void __iomem *gpio_base = gpio->base + port->offset;
> +
> + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, false);
> + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, true);
> +
> + return 0;
> +}
> +
> +static int owl_gpio_direction_output(struct gpio_chip *chip,
> + unsigned int offset, int value)
> +{
> + struct owl_gpio *gpio = gpiochip_get_data(chip);
> + const struct owl_gpio_port *port = gpio->port;
> + void __iomem *gpio_base = gpio->base + port->offset;
> +
> + owl_gpio_set_reg(gpio_base + GPIO_INEN, offset, false);
> + owl_gpio_set_reg(gpio_base + GPIO_OUTEN, offset, true);
> + owl_gpio_set(chip, offset, value);
> +
> + return 0;
> +}
> +
> +#define OWL_GPIO_PORT(port, base, count) \
> + [OWL_GPIO_PORT_##port] = { \
> + .name = #port, \
> + .offset = base, \
> + .pins = count, \
> + }
> +
> +static const struct owl_gpio_port s900_gpio_ports[] = {
> + OWL_GPIO_PORT(A, 0x0000, 32),
> + OWL_GPIO_PORT(B, 0x000C, 32),
> + OWL_GPIO_PORT(C, 0x0018, 12),
> + OWL_GPIO_PORT(D, 0x0024, 30),
> + OWL_GPIO_PORT(E, 0x0030, 32),
> + OWL_GPIO_PORT(F, 0x00F0, 8),
> +};
> +
> +static int owl_gpio_probe(struct platform_device *pdev)
> +{
> + struct owl_gpio *gpio;
> + const struct owl_gpio_port *port;
> + int ret;
> +
> + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
> + if (!gpio)
> + return -ENOMEM;
> +
> + gpio->base = of_iomap(pdev->dev.of_node, 0);
> + if (IS_ERR(gpio->base))
> + return PTR_ERR(gpio->base);
> +
> + gpio->id = of_alias_get_id(pdev->dev.of_node, "gpio");
> + if (gpio->id < 0)
> + return gpio->id;
> +
> + port = &s900_gpio_ports[gpio->id];
> +
> + gpio->gpio.request = owl_gpio_request;
> + gpio->gpio.free = owl_gpio_free;
> + gpio->gpio.get = owl_gpio_get;
> + gpio->gpio.set = owl_gpio_set;
> + gpio->gpio.direction_input = owl_gpio_direction_input;
> + gpio->gpio.direction_output = owl_gpio_direction_output;
> +
> + gpio->gpio.base = -1;
> + gpio->gpio.parent = &pdev->dev;
> + gpio->gpio.label = port->name;
> + gpio->gpio.ngpio = port->pins;
> +
> + gpio->port = port;
> +
> + platform_set_drvdata(pdev, gpio);
> +
> + ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio, gpio);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Failed to register gpiochip\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static const struct of_device_id owl_gpio_of_match[] = {
> + { .compatible = "actions,s900-gpio", },
> + { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, owl_gpio_of_match);
> +
> +static struct platform_driver owl_gpio_driver = {
> + .driver = {
> + .name = "owl-gpio",
> + .of_match_table = owl_gpio_of_match,
> + },
> + .probe = owl_gpio_probe,
> +};
> +module_platform_driver(owl_gpio_driver);
> +
> +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>");
> +MODULE_DESCRIPTION("Actions Semi OWL SoCs GPIO driver");
> +MODULE_LICENSE("GPL");
> --
> 2.14.1
>
--
With Best Regards,
Andy Shevchenko
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