| Message ID | 3baa6eaf49633014279fcf451abba16304e3e8d1.1553537396.git.sramani@mellanox.com |
|---|---|
| State | New |
| Headers | show |
| Series | gpio: add driver for Mellanox BlueField GPIO | expand |
pon., 25 mar 2019 o 19:30 Shravan Kumar Ramani <sramani@mellanox.com> napisał(a): > > This patch adds support for the GPIO controller used by Mellanox > BlueField SOCs. > > Reviewed-by: David Woods <dwoods@mellanox.com> > Signed-off-by: Shravan Kumar Ramani <sramani@mellanox.com> > --- > drivers/gpio/Kconfig | 7 +++ > drivers/gpio/Makefile | 1 + > drivers/gpio/gpio-mlxbf.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 162 insertions(+) > create mode 100644 drivers/gpio/gpio-mlxbf.c > > diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig > index 3f50526..0d9ddff 100644 > --- a/drivers/gpio/Kconfig > +++ b/drivers/gpio/Kconfig > @@ -1316,6 +1316,13 @@ config GPIO_MERRIFIELD > help > Say Y here to support Intel Merrifield GPIO. > > +config GPIO_MLXBF > + tristate "Mellanox BlueField SoC GPIO" > + depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || COMPILE_TEST > + select GPIO_GENERIC > + help > + Say Y here if you want GPIO support on Mellanox BlueField SoC. > + > config GPIO_ML_IOH > tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support" > depends on X86 || COMPILE_TEST > diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile > index 54d5527..db8d854 100644 > --- a/drivers/gpio/Makefile > +++ b/drivers/gpio/Makefile > @@ -85,6 +85,7 @@ obj-$(CONFIG_GPIO_MENZ127) += gpio-menz127.o > obj-$(CONFIG_GPIO_MERRIFIELD) += gpio-merrifield.o > obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o > obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o > +obj-$(CONFIG_GPIO_MLXBF) += gpio-mlxbf.o > obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o > obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o > obj-$(CONFIG_GPIO_MOCKUP) += gpio-mockup.o > diff --git a/drivers/gpio/gpio-mlxbf.c b/drivers/gpio/gpio-mlxbf.c > new file mode 100644 > index 0000000..42087c6 > --- /dev/null > +++ b/drivers/gpio/gpio-mlxbf.c > @@ -0,0 +1,154 @@ > +// SPDX-License-Identifier: GPL-2.0 > + > +#include <linux/acpi.h> > +#include <linux/bitops.h> > +#include <linux/device.h> > +#include <linux/gpio/driver.h> > +#include <linux/io.h> > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/platform_device.h> > +#include <linux/pm.h> > +#include <linux/resource.h> > +#include <linux/types.h> > +#include <linux/version.h> > + > +/* Number of pins on BlueField */ > +#define MLXBF_GPIO_NR 54 > + > +/* Pad Electrical Controls. */ > +#define MLXBF_GPIO_PAD_CONTROL_FIRST_WORD 0x0700 > +#define MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD 0x0708 > +#define MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD 0x0710 > +#define MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD 0x0718 > + > +#define MLXBF_GPIO_PIN_DIR_I 0x1040 > +#define MLXBF_GPIO_PIN_DIR_O 0x1048 > +#define MLXBF_GPIO_PIN_STATE 0x1000 > +#define MLXBF_GPIO_SCRATCHPAD 0x20 > + > +#ifdef CONFIG_PM > +struct mlxbf_gpio_context_save_regs { > + u64 scratchpad; > + u64 pad_control[MLXBF_GPIO_NR]; > + u64 pin_dir_i; > + u64 pin_dir_o; > +}; > +#endif > + > +/* Device state structure. */ > +struct mlxbf_gpio_state { > + struct gpio_chip gc; > + > + /* Memory Address */ > + void __iomem *base; > + > +#ifdef CONFIG_PM > + struct mlxbf_gpio_context_save_regs csave_regs; > +#endif > +}; > + > +static int mlxbf_gpio_probe(struct platform_device *pdev) > +{ > + struct mlxbf_gpio_state *gs; > + struct device *dev = &pdev->dev; > + struct gpio_chip *gc; > + struct resource *res; > + int ret; > + > + gs = devm_kzalloc(&pdev->dev, sizeof(*gs), GFP_KERNEL); > + if (!gs) > + return -ENOMEM; > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + gs->base = devm_ioremap_resource(&pdev->dev, res); As of v5.1-rc1 we have devm_platform_ioremap_resource(). Please use it here. > + if (IS_ERR(gs->base)) > + return PTR_ERR(gs->base); > + > + gc = &gs->gc; > + ret = bgpio_init(gc, dev, 8, > + gs->base + MLXBF_GPIO_PIN_STATE, > + NULL, > + NULL, > + gs->base + MLXBF_GPIO_PIN_DIR_O, > + gs->base + MLXBF_GPIO_PIN_DIR_I, > + 0); > + if (ret) > + return -ENODEV; Add a new line after the return. > + gc->owner = THIS_MODULE; > + gc->ngpio = MLXBF_GPIO_NR; > + > + ret = devm_gpiochip_add_data(dev, &gs->gc, gs); > + if (ret) { > + dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n"); > + return ret; > + } > + > + platform_set_drvdata(pdev, gs); > + dev_info(&pdev->dev, "registered Mellanox BlueField GPIO"); > + return 0; > +} > + > +#ifdef CONFIG_PM > +static int mlxbf_gpio_suspend(struct platform_device *pdev, pm_message_t state) > +{ > + struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev); > + > + gs->csave_regs.scratchpad = readq(gs->base + MLXBF_GPIO_SCRATCHPAD); > + gs->csave_regs.pad_control[0] = > + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD); > + gs->csave_regs.pad_control[1] = > + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD); > + gs->csave_regs.pad_control[2] = > + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD); > + gs->csave_regs.pad_control[3] = > + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD); > + gs->csave_regs.pin_dir_i = readq(gs->base + MLXBF_GPIO_PIN_DIR_I); > + gs->csave_regs.pin_dir_o = readq(gs->base + MLXBF_GPIO_PIN_DIR_O); > + > + return 0; > +} > + > +static int mlxbf_gpio_resume(struct platform_device *pdev) > +{ > + struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev); > + > + writeq(gs->csave_regs.scratchpad, gs->base + MLXBF_GPIO_SCRATCHPAD); > + writeq(gs->csave_regs.pad_control[0], > + gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD); > + writeq(gs->csave_regs.pad_control[1], > + gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD); > + writeq(gs->csave_regs.pad_control[2], > + gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD); > + writeq(gs->csave_regs.pad_control[3], > + gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD); > + writeq(gs->csave_regs.pin_dir_i, gs->base + MLXBF_GPIO_PIN_DIR_I); > + writeq(gs->csave_regs.pin_dir_o, gs->base + MLXBF_GPIO_PIN_DIR_O); > + > + return 0; > +} > +#endif > + > +static const struct acpi_device_id mlxbf_gpio_acpi_match[] = { > + { "MLNXBF02", 0 }, > + {} > +}; > +MODULE_DEVICE_TABLE(acpi, mlxbf_gpio_acpi_match); > + > +static struct platform_driver mlxbf_gpio_driver = { > + .driver = { > + .name = "mlxbf_gpio", > + .acpi_match_table = ACPI_PTR(mlxbf_gpio_acpi_match), > + }, > + .probe = mlxbf_gpio_probe, > +#ifdef CONFIG_PM > + .suspend = mlxbf_gpio_suspend, > + .resume = mlxbf_gpio_resume, > +#endif > +}; > + > +module_platform_driver(mlxbf_gpio_driver); > + > +MODULE_DESCRIPTION("Mellanox BlueField GPIO Driver"); > +MODULE_AUTHOR("Mellanox Technologies"); > +MODULE_LICENSE("GPL"); > -- > 2.1.2 > Other than that, looks good to me. I like how this driver shrank since v1. Bart
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 3f50526..0d9ddff 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1316,6 +1316,13 @@ config GPIO_MERRIFIELD help Say Y here to support Intel Merrifield GPIO. +config GPIO_MLXBF + tristate "Mellanox BlueField SoC GPIO" + depends on (MELLANOX_PLATFORM && ARM64 && ACPI) || COMPILE_TEST + select GPIO_GENERIC + help + Say Y here if you want GPIO support on Mellanox BlueField SoC. + config GPIO_ML_IOH tristate "OKI SEMICONDUCTOR ML7213 IOH GPIO support" depends on X86 || COMPILE_TEST diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index 54d5527..db8d854 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -85,6 +85,7 @@ obj-$(CONFIG_GPIO_MENZ127) += gpio-menz127.o obj-$(CONFIG_GPIO_MERRIFIELD) += gpio-merrifield.o obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o +obj-$(CONFIG_GPIO_MLXBF) += gpio-mlxbf.o obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o obj-$(CONFIG_GPIO_MM_LANTIQ) += gpio-mm-lantiq.o obj-$(CONFIG_GPIO_MOCKUP) += gpio-mockup.o diff --git a/drivers/gpio/gpio-mlxbf.c b/drivers/gpio/gpio-mlxbf.c new file mode 100644 index 0000000..42087c6 --- /dev/null +++ b/drivers/gpio/gpio-mlxbf.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/acpi.h> +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/gpio/driver.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/resource.h> +#include <linux/types.h> +#include <linux/version.h> + +/* Number of pins on BlueField */ +#define MLXBF_GPIO_NR 54 + +/* Pad Electrical Controls. */ +#define MLXBF_GPIO_PAD_CONTROL_FIRST_WORD 0x0700 +#define MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD 0x0708 +#define MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD 0x0710 +#define MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD 0x0718 + +#define MLXBF_GPIO_PIN_DIR_I 0x1040 +#define MLXBF_GPIO_PIN_DIR_O 0x1048 +#define MLXBF_GPIO_PIN_STATE 0x1000 +#define MLXBF_GPIO_SCRATCHPAD 0x20 + +#ifdef CONFIG_PM +struct mlxbf_gpio_context_save_regs { + u64 scratchpad; + u64 pad_control[MLXBF_GPIO_NR]; + u64 pin_dir_i; + u64 pin_dir_o; +}; +#endif + +/* Device state structure. */ +struct mlxbf_gpio_state { + struct gpio_chip gc; + + /* Memory Address */ + void __iomem *base; + +#ifdef CONFIG_PM + struct mlxbf_gpio_context_save_regs csave_regs; +#endif +}; + +static int mlxbf_gpio_probe(struct platform_device *pdev) +{ + struct mlxbf_gpio_state *gs; + struct device *dev = &pdev->dev; + struct gpio_chip *gc; + struct resource *res; + int ret; + + gs = devm_kzalloc(&pdev->dev, sizeof(*gs), GFP_KERNEL); + if (!gs) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + gs->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(gs->base)) + return PTR_ERR(gs->base); + + gc = &gs->gc; + ret = bgpio_init(gc, dev, 8, + gs->base + MLXBF_GPIO_PIN_STATE, + NULL, + NULL, + gs->base + MLXBF_GPIO_PIN_DIR_O, + gs->base + MLXBF_GPIO_PIN_DIR_I, + 0); + if (ret) + return -ENODEV; + gc->owner = THIS_MODULE; + gc->ngpio = MLXBF_GPIO_NR; + + ret = devm_gpiochip_add_data(dev, &gs->gc, gs); + if (ret) { + dev_err(&pdev->dev, "Failed adding memory mapped gpiochip\n"); + return ret; + } + + platform_set_drvdata(pdev, gs); + dev_info(&pdev->dev, "registered Mellanox BlueField GPIO"); + return 0; +} + +#ifdef CONFIG_PM +static int mlxbf_gpio_suspend(struct platform_device *pdev, pm_message_t state) +{ + struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev); + + gs->csave_regs.scratchpad = readq(gs->base + MLXBF_GPIO_SCRATCHPAD); + gs->csave_regs.pad_control[0] = + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD); + gs->csave_regs.pad_control[1] = + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD); + gs->csave_regs.pad_control[2] = + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD); + gs->csave_regs.pad_control[3] = + readq(gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD); + gs->csave_regs.pin_dir_i = readq(gs->base + MLXBF_GPIO_PIN_DIR_I); + gs->csave_regs.pin_dir_o = readq(gs->base + MLXBF_GPIO_PIN_DIR_O); + + return 0; +} + +static int mlxbf_gpio_resume(struct platform_device *pdev) +{ + struct mlxbf_gpio_state *gs = platform_get_drvdata(pdev); + + writeq(gs->csave_regs.scratchpad, gs->base + MLXBF_GPIO_SCRATCHPAD); + writeq(gs->csave_regs.pad_control[0], + gs->base + MLXBF_GPIO_PAD_CONTROL_FIRST_WORD); + writeq(gs->csave_regs.pad_control[1], + gs->base + MLXBF_GPIO_PAD_CONTROL_1_FIRST_WORD); + writeq(gs->csave_regs.pad_control[2], + gs->base + MLXBF_GPIO_PAD_CONTROL_2_FIRST_WORD); + writeq(gs->csave_regs.pad_control[3], + gs->base + MLXBF_GPIO_PAD_CONTROL_3_FIRST_WORD); + writeq(gs->csave_regs.pin_dir_i, gs->base + MLXBF_GPIO_PIN_DIR_I); + writeq(gs->csave_regs.pin_dir_o, gs->base + MLXBF_GPIO_PIN_DIR_O); + + return 0; +} +#endif + +static const struct acpi_device_id mlxbf_gpio_acpi_match[] = { + { "MLNXBF02", 0 }, + {} +}; +MODULE_DEVICE_TABLE(acpi, mlxbf_gpio_acpi_match); + +static struct platform_driver mlxbf_gpio_driver = { + .driver = { + .name = "mlxbf_gpio", + .acpi_match_table = ACPI_PTR(mlxbf_gpio_acpi_match), + }, + .probe = mlxbf_gpio_probe, +#ifdef CONFIG_PM + .suspend = mlxbf_gpio_suspend, + .resume = mlxbf_gpio_resume, +#endif +}; + +module_platform_driver(mlxbf_gpio_driver); + +MODULE_DESCRIPTION("Mellanox BlueField GPIO Driver"); +MODULE_AUTHOR("Mellanox Technologies"); +MODULE_LICENSE("GPL");