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Subject[PATCH v2 1/1] gpio: add driver for Mellanox BlueField GPIO controller
Date
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 | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-mlxbf.c | 246 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 253 insertions(+)
create mode 100644 drivers/gpio/gpio-mlxbf.c

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index b5a2845..c950fe8 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1292,6 +1292,12 @@ 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
+ 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 37628f8..8d54279 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -83,6 +83,7 @@ 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..bf197aa
--- /dev/null
+++ b/drivers/gpio/gpio-mlxbf.c
@@ -0,0 +1,246 @@
+// 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/ioport.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/resource.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/version.h>
+
+/* Number of pins on BlueField */
+#define MLXBF_GPIO_NR 54
+
+/* Pad Electrical Controls. */
+#define GPIO_PAD_CONTROL__FIRST_WORD 0x0700
+#define GPIO_PAD_CONTROL_1__FIRST_WORD 0x0708
+#define GPIO_PAD_CONTROL_2__FIRST_WORD 0x0710
+#define GPIO_PAD_CONTROL_3__FIRST_WORD 0x0718
+
+#define GPIO_PIN_DIR_I 0x1040
+#define GPIO_PIN_DIR_O 0x1048
+#define GPIO_PIN_STATE 0x1000
+#define GPIO_SCRATCHPAD 0x20
+
+#ifdef CONFIG_PM
+struct bluefield_context_save_regs {
+ u64 gpio_scratchpad;
+ u64 gpio_pad_control[MLXBF_GPIO_NR];
+ u64 gpio_pin_dir_i;
+ u64 gpio_pin_dir_o;
+};
+#endif
+
+/* Device state structure. */
+struct gpio_state {
+ struct gpio_chip gc;
+
+ /* Must hold this lock to modify shared data. */
+ spinlock_t lock;
+
+ /* Memory Address */
+ void __iomem *dc_base;
+
+#ifdef CONFIG_PM
+ struct bluefield_context_save_regs csave_regs;
+#endif
+};
+
+static int gpio_bf_set_input(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gpio_state *gs = gpiochip_get_data(chip);
+ u64 in;
+ u64 out;
+
+ out = readq(gs->dc_base + GPIO_PIN_DIR_O);
+ in = readq(gs->dc_base + GPIO_PIN_DIR_I);
+
+ writeq(out & ~BIT(offset), gs->dc_base + GPIO_PIN_DIR_O);
+ writeq(in | BIT(offset), gs->dc_base + GPIO_PIN_DIR_I);
+
+ return 0;
+}
+
+static int gpio_bf_set_output(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gpio_state *gs = gpiochip_get_data(chip);
+ u64 in;
+ u64 out;
+
+ out = readq(gs->dc_base + GPIO_PIN_DIR_O);
+ in = readq(gs->dc_base + GPIO_PIN_DIR_I);
+
+ writeq(out | BIT(offset), gs->dc_base + GPIO_PIN_DIR_O);
+ writeq(in & ~BIT(offset), gs->dc_base + GPIO_PIN_DIR_I);
+
+ return 0;
+}
+
+static int gpio_bf_set_output_lock(struct gpio_chip *chip,
+ unsigned int offset, int value)
+{
+ struct gpio_state *gs = gpiochip_get_data(chip);
+
+ spin_lock(&gs->lock);
+ gpio_bf_set_output(chip, offset);
+ spin_unlock(&gs->lock);
+
+ return 0;
+}
+
+static int gpio_bf_set_input_lock(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gpio_state *gs = gpiochip_get_data(chip);
+
+ spin_lock(&gs->lock);
+ gpio_bf_set_input(chip, offset);
+ spin_unlock(&gs->lock);
+
+ return 0;
+}
+
+static int gpio_bf_get(struct gpio_chip *chip, unsigned int offset)
+{
+ u64 value;
+ struct gpio_state *gs = gpiochip_get_data(chip);
+
+ value = readq(gs->dc_base + GPIO_PIN_STATE);
+
+ return (value >> offset) & 1;
+}
+
+static void gpio_bf_set(struct gpio_chip *chip, unsigned int offset, int value)
+{
+ u64 data;
+ struct gpio_state *gs = gpiochip_get_data(chip);
+
+ spin_lock(&gs->lock);
+ data = readq(gs->dc_base + GPIO_PIN_STATE);
+
+ if (value)
+ data |= BIT(offset);
+ else
+ data &= ~BIT(offset);
+ writeq(data, gs->dc_base + GPIO_PIN_STATE);
+ spin_unlock(&gs->lock);
+}
+
+static int gpiodrv_probe(struct platform_device *pdev)
+{
+ struct gpio_state *gs;
+ struct device *dev = &pdev->dev;
+ struct gpio_chip *gc;
+ struct resource *dc_res;
+ int ret;
+
+ dc_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!dc_res)
+ return -EINVAL;
+
+ gs = devm_kzalloc(&pdev->dev, sizeof(struct gpio_state), GFP_KERNEL);
+ if (!gs)
+ return -ENOMEM;
+
+ gs->dc_base = devm_ioremap_resource(&pdev->dev, dc_res);
+ if (!gs->dc_base)
+ return -ENOMEM;
+
+ gc = &gs->gc;
+ gc->direction_input = gpio_bf_set_input_lock;
+ gc->get = gpio_bf_get;
+ gc->direction_output = gpio_bf_set_output_lock;
+ gc->set = gpio_bf_set;
+ gc->label = dev_name(dev);
+ gc->parent = &pdev->dev;
+ gc->owner = THIS_MODULE;
+ gc->base = 0;
+ 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");
+ goto err;
+ }
+
+ spin_lock_init(&gs->lock);
+ platform_set_drvdata(pdev, gs);
+ dev_info(&pdev->dev, "registered Mellanox BlueField GPIO");
+ return 0;
+
+err:
+ dev_err(&pdev->dev, "Probe, Failed\n");
+ return ret;
+}
+
+#ifdef CONFIG_PM
+static int gpiodrv_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct gpio_state *gs = platform_get_drvdata(pdev);
+
+ gs->csave_regs.gpio_scratchpad = readq(gs->dc_base + GPIO_SCRATCHPAD);
+ gs->csave_regs.gpio_pad_control[0] =
+ readq(gs->dc_base + GPIO_PAD_CONTROL__FIRST_WORD);
+ gs->csave_regs.gpio_pad_control[1] =
+ readq(gs->dc_base + GPIO_PAD_CONTROL_1__FIRST_WORD);
+ gs->csave_regs.gpio_pad_control[2] =
+ readq(gs->dc_base + GPIO_PAD_CONTROL_2__FIRST_WORD);
+ gs->csave_regs.gpio_pad_control[3] =
+ readq(gs->dc_base + GPIO_PAD_CONTROL_3__FIRST_WORD);
+ gs->csave_regs.gpio_pin_dir_i = readq(gs->dc_base + GPIO_PIN_DIR_I);
+ gs->csave_regs.gpio_pin_dir_o = readq(gs->dc_base + GPIO_PIN_DIR_O);
+
+ return 0;
+}
+
+static int gpiodrv_resume(struct platform_device *pdev)
+{
+ struct gpio_state *gs = platform_get_drvdata(pdev);
+
+ writeq(gs->csave_regs.gpio_scratchpad, gs->dc_base + GPIO_SCRATCHPAD);
+ writeq(gs->csave_regs.gpio_pad_control[0], gs->dc_base +
+ GPIO_PAD_CONTROL__FIRST_WORD);
+ writeq(gs->csave_regs.gpio_pad_control[1], gs->dc_base +
+ GPIO_PAD_CONTROL_1__FIRST_WORD);
+ writeq(gs->csave_regs.gpio_pad_control[2], gs->dc_base +
+ GPIO_PAD_CONTROL_2__FIRST_WORD);
+ writeq(gs->csave_regs.gpio_pad_control[3], gs->dc_base +
+ GPIO_PAD_CONTROL_3__FIRST_WORD);
+ writeq(gs->csave_regs.gpio_pin_dir_i, gs->dc_base + GPIO_PIN_DIR_I);
+ writeq(gs->csave_regs.gpio_pin_dir_o, gs->dc_base + GPIO_PIN_DIR_O);
+
+ return 0;
+}
+#endif
+
+static const struct acpi_device_id gpiodrv_acpi_match[] = {
+ { "MLNXBF02", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, gpiodrv_acpi_match);
+
+static struct platform_driver gpiodrv_gpio_driver = {
+ .driver = {
+ .name = "gpiodrv",
+ .acpi_match_table = ACPI_PTR(gpiodrv_acpi_match),
+ },
+ .probe = gpiodrv_probe,
+#ifdef CONFIG_PM
+ .suspend = gpiodrv_suspend,
+ .resume = gpiodrv_resume,
+#endif
+};
+
+module_platform_driver(gpiodrv_gpio_driver);
+
+MODULE_DESCRIPTION("Mellanox BlueField GPIO Driver");
+MODULE_AUTHOR("Mellanox Technologies");
+MODULE_LICENSE("GPL");
--
2.1.2
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