On Thu, Oct 31, 2024 at 1:04 PM Conor Dooley <conor@xxxxxxxxxx> wrote:
>
> From: Lewis Hanly <lewis.hanly@xxxxxxxxxxxxx>
>
> Add a driver to support the Polarfire SoC gpio controller. Interrupt
> controller support is unavailable for now and will be added at a later
> date.
>
> Signed-off-by: Lewis Hanly <lewis.hanly@xxxxxxxxxxxxx>
> Co-developed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> ---
> v9:
> - remove remove()
> - drop OF_GPIO from kconfig
> - add a prefix to MAX_NUM_GPIO
>
> v8:
> - drop interrupt support
> - replace regular mmio acesses with regmap (nice complexity reduction)
> - change mpfs_gpio_get() so that it can report non-zero when the line
> direction is output.
> ---
> drivers/gpio/Kconfig | 6 ++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-mpfs.c | 170 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 177 insertions(+)
> create mode 100644 drivers/gpio/gpio-mpfs.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index d93cd4f722b40..811263b033c89 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -549,6 +549,12 @@ config GPIO_PL061
> help
> Say yes here to support the PrimeCell PL061 GPIO device.
>
> +config GPIO_POLARFIRE_SOC
> + bool "Microchip FPGA GPIO support"
> + select REGMAP_MMIO
> + help
> + Say yes here to support the GPIO controllers on Microchip FPGAs.
> +
> config GPIO_PXA
> bool "PXA GPIO support"
> depends on ARCH_PXA || ARCH_MMP || COMPILE_TEST
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 1429e8c0229b9..fc66e6388c76c 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -133,6 +133,7 @@ obj-$(CONFIG_GPIO_PCI_IDIO_16) += gpio-pci-idio-16.o
> obj-$(CONFIG_GPIO_PISOSR) += gpio-pisosr.o
> obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
> obj-$(CONFIG_GPIO_PMIC_EIC_SPRD) += gpio-pmic-eic-sprd.o
> +obj-$(CONFIG_GPIO_POLARFIRE_SOC) += gpio-mpfs.o
> obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
> obj-$(CONFIG_GPIO_RASPBERRYPI_EXP) += gpio-raspberrypi-exp.o
> obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
> diff --git a/drivers/gpio/gpio-mpfs.c b/drivers/gpio/gpio-mpfs.c
> new file mode 100644
> index 0000000000000..e5017307b0fe6
> --- /dev/null
> +++ b/drivers/gpio/gpio-mpfs.c
> @@ -0,0 +1,170 @@
> +// SPDX-License-Identifier: (GPL-2.0)
> +/*
> + * Microchip PolarFire SoC (MPFS) GPIO controller driver
> + *
> + * Copyright (c) 2018-2024 Microchip Technology Inc. and its subsidiaries
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/errno.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/init.h>
> +#include <linux/of.h>
Sorry for noticing it only now but you don't use any symbol from this
header so it can be dropped.
> +#include <linux/mod_devicetable.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/spinlock.h>
> +
> +#define MPFS_GPIO_CTRL(i) (0x4 * (i))
> +#define MPFS_MAX_NUM_GPIO 32
> +#define MPFS_GPIO_EN_INT 3
> +#define MPFS_GPIO_EN_OUT_BUF BIT(2)
> +#define MPFS_GPIO_EN_IN BIT(1)
> +#define MPFS_GPIO_EN_OUT BIT(0)
> +#define MPFS_GPIO_DIR_MASK GENMASK(2, 0)
> +
> +#define MPFS_GPIO_TYPE_INT_EDGE_BOTH 0x80
> +#define MPFS_GPIO_TYPE_INT_EDGE_NEG 0x60
> +#define MPFS_GPIO_TYPE_INT_EDGE_POS 0x40
> +#define MPFS_GPIO_TYPE_INT_LEVEL_LOW 0x20
> +#define MPFS_GPIO_TYPE_INT_LEVEL_HIGH 0x00
> +#define MPFS_GPIO_TYPE_INT_MASK GENMASK(7, 5)
> +#define MPFS_IRQ_REG 0x80
> +#define MPFS_INP_REG 0x84
> +#define MPFS_OUTP_REG 0x88
> +
> +struct mpfs_gpio_chip {
> + struct clk *clk;
After the initial clk_get() you never reference it again so there's no
need to store the address.
> + struct regmap *regs;
> + struct gpio_chip gc;
> +};
> +
> +static const struct regmap_config mpfs_gpio_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> +};
> +
> +static int mpfs_gpio_direction_input(struct gpio_chip *gc, unsigned int gpio_index)
> +{
> + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
> +
> + regmap_update_bits(mpfs_gpio->regs, MPFS_GPIO_CTRL(gpio_index),
> + MPFS_GPIO_DIR_MASK, MPFS_GPIO_EN_IN);
> +
> + return 0;
> +}
> +
> +static int mpfs_gpio_direction_output(struct gpio_chip *gc, unsigned int gpio_index, int value)
> +{
> + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
> +
> + regmap_update_bits(mpfs_gpio->regs, MPFS_GPIO_CTRL(gpio_index),
> + MPFS_GPIO_DIR_MASK, MPFS_GPIO_EN_IN);
> + regmap_update_bits(mpfs_gpio->regs, MPFS_OUTP_REG, BIT(gpio_index),
> + value << gpio_index);
> +
> + return 0;
> +}
> +
> +static int mpfs_gpio_get_direction(struct gpio_chip *gc,
> + unsigned int gpio_index)
> +{
> + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
> + unsigned int gpio_cfg;
> +
> + regmap_read(mpfs_gpio->regs, MPFS_GPIO_CTRL(gpio_index), &gpio_cfg);
> + if (gpio_cfg & MPFS_GPIO_EN_IN)
> + return GPIO_LINE_DIRECTION_IN;
> +
> + return GPIO_LINE_DIRECTION_OUT;
> +}
> +
> +static int mpfs_gpio_get(struct gpio_chip *gc, unsigned int gpio_index)
> +{
> + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
> +
> + if (mpfs_gpio_get_direction(gc, gpio_index) == GPIO_LINE_DIRECTION_OUT)
> + return regmap_test_bits(mpfs_gpio->regs, MPFS_OUTP_REG, BIT(gpio_index));
> + else
> + return regmap_test_bits(mpfs_gpio->regs, MPFS_INP_REG, BIT(gpio_index));
> +}
> +
> +static void mpfs_gpio_set(struct gpio_chip *gc, unsigned int gpio_index, int value)
> +{
> + struct mpfs_gpio_chip *mpfs_gpio = gpiochip_get_data(gc);
> +
> + mpfs_gpio_get(gc, gpio_index);
> +
> + regmap_update_bits(mpfs_gpio->regs, MPFS_OUTP_REG, BIT(gpio_index),
> + value << gpio_index);
> +
> + mpfs_gpio_get(gc, gpio_index);
> +}
> +
> +static int mpfs_gpio_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct mpfs_gpio_chip *mpfs_gpio;
> + struct clk *clk;
> + void __iomem *base;
> + int ret, ngpios;
> +
> + mpfs_gpio = devm_kzalloc(dev, sizeof(*mpfs_gpio), GFP_KERNEL);
> + if (!mpfs_gpio)
> + return -ENOMEM;
> +
> + base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(base))
> + return dev_err_probe(dev, PTR_ERR(base), "failed to ioremap memory resource\n");
> +
> + mpfs_gpio->regs = devm_regmap_init_mmio(dev, base, &mpfs_gpio_regmap_config);
> + if (IS_ERR(mpfs_gpio->regs))
> + return dev_err_probe(dev, PTR_ERR(mpfs_gpio->regs),
> + "failed to initialise regmap\n");
> +
> + clk = devm_clk_get_enabled(dev, NULL);
> + if (IS_ERR(clk))
> + return dev_err_probe(dev, PTR_ERR(clk), "failed to get and enable clock\n");
> +
> + mpfs_gpio->clk = clk;
> +
> + ngpios = MPFS_MAX_NUM_GPIO;
> + device_property_read_u32(dev, "ngpios", &ngpios);
> + if (ngpios > MPFS_MAX_NUM_GPIO)
> + ngpios = MPFS_MAX_NUM_GPIO;
> +
> + mpfs_gpio->gc.direction_input = mpfs_gpio_direction_input;
> + mpfs_gpio->gc.direction_output = mpfs_gpio_direction_output;
> + mpfs_gpio->gc.get_direction = mpfs_gpio_get_direction;
> + mpfs_gpio->gc.get = mpfs_gpio_get;
> + mpfs_gpio->gc.set = mpfs_gpio_set;
> + mpfs_gpio->gc.base = -1;
> + mpfs_gpio->gc.ngpio = ngpios;
The "ngpios" property will be parsed by GPIO core so no need to set it.
> + mpfs_gpio->gc.label = dev_name(dev);
> + mpfs_gpio->gc.parent = dev;
> + mpfs_gpio->gc.owner = THIS_MODULE;
> +
> + ret = devm_gpiochip_add_data(dev, &mpfs_gpio->gc, mpfs_gpio);
> + if (ret)
> + return ret;
> +
> + platform_set_drvdata(pdev, mpfs_gpio);
There's no platform_get_drvdata() in the driver so you can drop this too.
Bart
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mpfs_gpio_of_ids[] = {
> + { .compatible = "microchip,mpfs-gpio", },
> + { /* end of list */ }
> +};
> +
> +static struct platform_driver mpfs_gpio_driver = {
> + .probe = mpfs_gpio_probe,
> + .driver = {
> + .name = "microchip,mpfs-gpio",
> + .of_match_table = mpfs_gpio_of_ids,
> + },
> +};
> +builtin_platform_driver(mpfs_gpio_driver);
> --
> 2.45.2
>
Re: [PATCH v9 1/1] gpio: mpfs: add polarfire soc gpio support
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- Subject: Re: [PATCH v9 1/1] gpio: mpfs: add polarfire soc gpio support
- From: Bartosz Golaszewski <brgl@xxxxxxxx>
- Date: Thu, 31 Oct 2024 14:00:22 +0100
- In-reply-to: <20241031-appease-purse-55145b5dfba4@spud>
- References: <20241031-scouting-earmark-6b4dfc6bc6e2@spud> <20241031-appease-purse-55145b5dfba4@spud>
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- References:
- [PATCH v9 0/1] Polarfire SoC GPIO support
- From: Conor Dooley
- [PATCH v9 1/1] gpio: mpfs: add polarfire soc gpio support
- From: Conor Dooley
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