[U-Boot] [PATCH v4 081/100] x86: Add a generic Intel GPIO driver
Simon Glass
sjg at chromium.org
Fri Nov 22 04:18:46 UTC 2019
Add a GPIO driver which uses the pinctrl driver to access the pad
information. This driver relies on the GPIO nodes being subnodes to the
pinctrl device.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v4: None
Changes in v3: None
Changes in v2: None
.../gpio/intel,apl-gpio.txt | 55 ++++++
drivers/gpio/Kconfig | 9 +
drivers/gpio/Makefile | 1 +
drivers/gpio/intel_gpio.c | 161 ++++++++++++++++++
4 files changed, 226 insertions(+)
create mode 100644 doc/device-tree-bindings/gpio/intel,apl-gpio.txt
create mode 100644 drivers/gpio/intel_gpio.c
diff --git a/doc/device-tree-bindings/gpio/intel,apl-gpio.txt b/doc/device-tree-bindings/gpio/intel,apl-gpio.txt
new file mode 100644
index 0000000000..e34e7c3501
--- /dev/null
+++ b/doc/device-tree-bindings/gpio/intel,apl-gpio.txt
@@ -0,0 +1,55 @@
+* Intel Apollo Lake GPIO controller
+
+The Apollo Lake (APL) GPIO controller is used to control GPIO functions of
+the pins.
+
+Required properties:
+- compatible: "intel,apl-gpio"
+- #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
+ nodes should be the following with values derived from the SoC user manual.
+ <[phandle of the gpio controller node]
+ [pin number within the gpio controller]
+ [flags]>
+
+ Values for gpio specifier:
+ - Pin number: is a GPIO pin number between 0 and 244
+ - Flags: GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW
+
+- gpio-controller: Specifies that the node is a gpio controller.
+
+Example:
+
+...
+{
+ p2sb: p2sb at d,0 {
+ reg = <0x02006810 0 0 0 0>;
+ compatible = "intel,apl-p2sb";
+ early-regs = <IOMAP_P2SB_BAR 0x100000>;
+
+ n {
+ compatible = "intel,apl-pinctrl";
+ intel,p2sb-port-id = <PID_GPIO_N>;
+ gpio_n: gpio-n {
+ compatible = "intel,apl-gpio";
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
+ };
+
+ i2c_2: i2c2 at 16,2 {
+ compatible = "intel,apl-i2c", "snps,designware-i2c-pci";
+ reg = <0x0200b210 0 0 0 0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+ clock-frequency = <400000>;
+ tpm at 50 {
+ reg = <0x50>;
+ compatible = "google,cr50";
+ u-boot,i2c-offset-len = <0>;
+ ready-gpio = <&gpio_n GPIO_28 GPIO_ACTIVE_LOW>;
+ };
+ };
+
+};
+...
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 447cf04578..1de6f5225e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -104,6 +104,15 @@ config INTEL_BROADWELL_GPIO
driver from the common Intel ICH6 driver. It supports a total of
95 GPIOs which can be configured from the device tree.
+config INTEL_GPIO
+ bool "Intel generic GPIO driver"
+ depends on DM_GPIO
+ help
+ Say yes here to select Intel generic GPIO driver. This controller
+ supports recent chips (e.g. Apollo Lake). It permits basic GPIO
+ control including setting pins to input/output. It makes use of its
+ parent pinctrl driver to actually effect changes.
+
config INTEL_ICH6_GPIO
bool "Intel ICH6 compatible legacy GPIO driver"
depends on DM_GPIO
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 3612e66786..449046b64c 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -17,6 +17,7 @@ endif
obj-$(CONFIG_AT91_GPIO) += at91_gpio.o
obj-$(CONFIG_ATMEL_PIO4) += atmel_pio4.o
obj-$(CONFIG_BCM6345_GPIO) += bcm6345_gpio.o
+obj-$(CONFIG_INTEL_GPIO) += intel_gpio.o
obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o
obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o
obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
diff --git a/drivers/gpio/intel_gpio.c b/drivers/gpio/intel_gpio.c
new file mode 100644
index 0000000000..eeff95de7b
--- /dev/null
+++ b/drivers/gpio/intel_gpio.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2019 Google LLC
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <p2sb.h>
+#include <pch.h>
+#include <pci.h>
+#include <syscon.h>
+#include <asm/cpu.h>
+#include <asm/gpio.h>
+#include <asm/intel_pinctrl.h>
+#include <asm/intel_pinctrl_defs.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/arch/gpio.h>
+#include <dt-bindings/gpio/x86-gpio.h>
+
+static int intel_gpio_direction_input(struct udevice *dev, uint offset)
+{
+ struct udevice *pinctrl = dev_get_parent(dev);
+ uint config_offset = intel_pinctrl_get_config_reg_addr(pinctrl, offset);
+
+ pcr_clrsetbits32(pinctrl, config_offset,
+ PAD_CFG0_MODE_MASK | PAD_CFG0_TX_STATE |
+ PAD_CFG0_RX_DISABLE,
+ PAD_CFG0_MODE_GPIO | PAD_CFG0_TX_DISABLE);
+
+ return 0;
+}
+
+static int intel_gpio_direction_output(struct udevice *dev, uint offset,
+ int value)
+{
+ struct udevice *pinctrl = dev_get_parent(dev);
+ uint config_offset = intel_pinctrl_get_config_reg_addr(pinctrl, offset);
+
+ pcr_clrsetbits32(dev, config_offset,
+ PAD_CFG0_MODE_MASK | PAD_CFG0_RX_STATE |
+ PAD_CFG0_TX_DISABLE,
+ PAD_CFG0_MODE_GPIO | PAD_CFG0_RX_DISABLE |
+ (value ? PAD_CFG0_TX_STATE : 0));
+
+ return 0;
+}
+
+static int intel_gpio_get_value(struct udevice *dev, uint offset)
+{
+ struct udevice *pinctrl = dev_get_parent(dev);
+ uint mode, rx_tx;
+ u32 reg;
+
+ reg = intel_pinctrl_get_config_reg(pinctrl, offset);
+ mode = (reg & PAD_CFG0_MODE_MASK) >> PAD_CFG0_MODE_SHIFT;
+ if (!mode) {
+ rx_tx = reg & (PAD_CFG0_TX_DISABLE | PAD_CFG0_RX_DISABLE);
+ if (rx_tx == PAD_CFG0_TX_DISABLE)
+ return mode & PAD_CFG0_RX_STATE_BIT ? 1 : 0;
+ else if (rx_tx == PAD_CFG0_RX_DISABLE)
+ return mode & PAD_CFG0_TX_STATE_BIT ? 1 : 0;
+ }
+
+ return 0;
+}
+
+static int intel_gpio_set_value(struct udevice *dev, unsigned offset, int value)
+{
+ struct udevice *pinctrl = dev_get_parent(dev);
+ uint config_offset = intel_pinctrl_get_config_reg_addr(pinctrl, offset);
+
+ pcr_clrsetbits32(dev, config_offset, PAD_CFG0_TX_STATE,
+ value ? PAD_CFG0_TX_STATE : 0);
+
+ return 0;
+}
+
+static int intel_gpio_get_function(struct udevice *dev, uint offset)
+{
+ struct udevice *pinctrl = dev_get_parent(dev);
+ uint mode, rx_tx;
+ u32 reg;
+
+ reg = intel_pinctrl_get_config_reg(pinctrl, offset);
+ mode = (reg & PAD_CFG0_MODE_MASK) >> PAD_CFG0_MODE_SHIFT;
+ if (!mode) {
+ rx_tx = reg & (PAD_CFG0_TX_DISABLE | PAD_CFG0_RX_DISABLE);
+ if (rx_tx == PAD_CFG0_TX_DISABLE)
+ return GPIOF_INPUT;
+ else if (rx_tx == PAD_CFG0_RX_DISABLE)
+ return GPIOF_OUTPUT;
+ }
+
+ return GPIOF_FUNC;
+}
+
+static int intel_gpio_xlate(struct udevice *orig_dev, struct gpio_desc *desc,
+ struct ofnode_phandle_args *args)
+{
+ struct udevice *pinctrl, *dev;
+ int gpio, ret;
+
+ /*
+ * GPIO numbers are global in the device tree so it doesn't matter
+ * which hone is used
+ */
+ gpio = args->args[0];
+ ret = intel_pinctrl_get_pad(gpio, &pinctrl, &desc->offset);
+ if (ret)
+ return log_msg_ret("bad", ret);
+ device_find_first_child(pinctrl, &dev);
+ if (!dev)
+ return log_msg_ret("no child", -ENOENT);
+ desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
+ desc->dev = dev;
+
+ return 0;
+}
+
+static int intel_gpio_probe(struct udevice *dev)
+{
+ return 0;
+}
+
+static int intel_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct gpio_dev_priv *upriv = dev_get_uclass_priv(dev);
+ struct intel_pinctrl_priv *pinctrl_priv = dev_get_priv(dev->parent);
+ const struct pad_community *comm = pinctrl_priv->comm;
+
+ upriv->gpio_count = comm->last_pad - comm->first_pad + 1;
+ upriv->bank_name = dev->name;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops gpio_intel_ops = {
+ .direction_input = intel_gpio_direction_input,
+ .direction_output = intel_gpio_direction_output,
+ .get_value = intel_gpio_get_value,
+ .set_value = intel_gpio_set_value,
+ .get_function = intel_gpio_get_function,
+ .xlate = intel_gpio_xlate,
+};
+
+static const struct udevice_id intel_intel_gpio_ids[] = {
+ { .compatible = "intel,apl-gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(gpio_intel) = {
+ .name = "gpio_intel",
+ .id = UCLASS_GPIO,
+ .of_match = intel_intel_gpio_ids,
+ .ops = &gpio_intel_ops,
+ .ofdata_to_platdata = intel_gpio_ofdata_to_platdata,
+ .probe = intel_gpio_probe,
+};
--
2.24.0.432.g9d3f5f5b63-goog
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