[U-Boot] [PATCH 60/69] x86: broadwell: Add a GPIO driver
Simon Glass
sjg at chromium.org
Mon Mar 7 03:28:43 CET 2016
Add a GPIO driver for the GPIO peripheral found on broadwell devices.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
drivers/gpio/Kconfig | 9 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/intel_broadwell_gpio.c | 198 ++++++++++++++++++++++++++++++++++++
3 files changed, 208 insertions(+)
create mode 100644 drivers/gpio/intel_broadwell_gpio.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 845dc72..e7ec384 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -39,6 +39,15 @@ config ATMEL_PIO4
may be dedicated as a general purpose I/O or be assigned to
a function of an embedded peripheral.
+config INTEL_BROADWELL_GPIO
+ bool "Intel Broadwell GPIO driver"
+ depends on DM
+ help
+ This driver supports Broadwell U devices which have an expanded
+ GPIO feature set. The difference is large enough to merit a separate
+ driver from the common Intel ICH6 driver. It supports a total of
+ 95 GPIOs which can be configure from the device tree.
+
config LPC32XX_GPIO
bool "LPC32XX GPIO driver"
depends on DM
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 845a6d4..5ac381a 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_DM_GPIO) += gpio-uclass.o
obj-$(CONFIG_AT91_GPIO) += at91_gpio.o
obj-$(CONFIG_ATMEL_PIO4) += atmel_pio4.o
obj-$(CONFIG_INTEL_ICH6_GPIO) += intel_ich6_gpio.o
+obj-$(CONFIG_INTEL_BROADWELL_GPIO) += intel_broadwell_gpio.o
obj-$(CONFIG_KIRKWOOD_GPIO) += kw_gpio.o
obj-$(CONFIG_KONA_GPIO) += kona_gpio.o
obj-$(CONFIG_MARVELL_GPIO) += mvgpio.o
diff --git a/drivers/gpio/intel_broadwell_gpio.c b/drivers/gpio/intel_broadwell_gpio.c
new file mode 100644
index 0000000..06bf46b
--- /dev/null
+++ b/drivers/gpio/intel_broadwell_gpio.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (c) 2012 The Chromium OS Authors.
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <pch.h>
+#include <pci.h>
+#include <syscon.h>
+#include <asm/cpu.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <asm/pci.h>
+#include <asm/arch/gpio.h>
+#include <dt-bindings/gpio/x86-gpio.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * struct broadwell_bank_priv - Private driver data
+ *
+ * @regs: Pointer to GPIO registers
+ * @bank: Bank number for this bank (0, 1 or 2)
+ * @offset: GPIO offset for this bank (0, 32 or 64)
+ */
+struct broadwell_bank_priv {
+ struct pch_lp_gpio_regs *regs;
+ int bank;
+ int offset;
+};
+
+static int broadwell_gpio_request(struct udevice *dev, unsigned offset,
+ const char *label)
+{
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct pch_lp_gpio_regs *regs = priv->regs;
+ u32 val;
+
+ /*
+ * Make sure that the GPIO pin we want isn't already in use for some
+ * built-in hardware function. We have to check this for every
+ * requested pin.
+ */
+ debug("%s: request bank %d offset %d: ", __func__, priv->bank, offset);
+ val = inl(®s->own[priv->bank]);
+ if (!(val & (1UL << offset))) {
+ debug("gpio is reserved for internal use\n");
+ return -EPERM;
+ }
+ debug("ok\n");
+
+ return 0;
+}
+
+static int broadwell_gpio_direction_input(struct udevice *dev, unsigned offset)
+{
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct pch_lp_gpio_regs *regs = priv->regs;
+
+ setio_le32(®s->config[priv->offset + offset], CONFA_DIR_INPUT);
+
+ return 0;
+}
+
+static int broadwell_gpio_get_value(struct udevice *dev, unsigned offset)
+{
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct pch_lp_gpio_regs *regs = priv->regs;
+
+ return inl(®s->config[priv->offset + offset]) & CONFA_LEVEL_HIGH ?
+ 1 : 0;
+}
+
+static int broadwell_gpio_set_value(struct udevice *dev, unsigned offset,
+ int value)
+{
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct pch_lp_gpio_regs *regs = priv->regs;
+
+ debug("%s: dev=%s, offset=%d, value=%d\n", __func__, dev->name, offset,
+ value);
+ clrsetio_le32(®s->config[priv->offset + offset], CONFA_OUTPUT_HIGH,
+ value ? CONFA_OUTPUT_HIGH : 0);
+
+ return 0;
+}
+
+static int broadwell_gpio_direction_output(struct udevice *dev, unsigned offset,
+ int value)
+{
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct pch_lp_gpio_regs *regs = priv->regs;
+
+ broadwell_gpio_set_value(dev, offset, value);
+ clrio_le32(®s->config[priv->offset + offset], CONFA_DIR_INPUT);
+
+ return 0;
+}
+
+static int broadwell_gpio_get_function(struct udevice *dev, unsigned offset)
+{
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct pch_lp_gpio_regs *regs = priv->regs;
+ u32 mask = 1UL << offset;
+
+ if (!(inl(®s->own[priv->bank]) & mask))
+ return GPIOF_FUNC;
+ if (inl(®s->config[priv->offset + offset]) & CONFA_DIR_INPUT)
+ return GPIOF_INPUT;
+ else
+ return GPIOF_OUTPUT;
+}
+
+static int broadwell_gpio_probe(struct udevice *dev)
+{
+ struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
+ struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct broadwell_bank_priv *priv = dev_get_priv(dev);
+ struct udevice *pinctrl;
+ int ret;
+
+ /* Set up pin control if available */
+ ret = syscon_get_by_driver_data(X86_SYSCON_PINCONF, &pinctrl);
+ debug("%s, pinctrl=%p, ret=%d\n", __func__, pinctrl, ret);
+
+ uc_priv->gpio_count = GPIO_PER_BANK;
+ uc_priv->bank_name = plat->bank_name;
+
+ priv->regs = (struct pch_lp_gpio_regs *)(uintptr_t)plat->base_addr;
+ priv->bank = plat->bank;
+ priv->offset = priv->bank * 32;
+ debug("%s: probe done, regs %p, bank %d\n", __func__, priv->regs,
+ priv->bank);
+
+ return 0;
+}
+
+static int broadwell_gpio_ofdata_to_platdata(struct udevice *dev)
+{
+ struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
+ u32 gpiobase;
+ int bank;
+ int ret;
+
+ ret = pch_get_gpio_base(dev->parent, &gpiobase);
+ if (ret)
+ return ret;
+
+ bank = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
+ if (bank == -1) {
+ debug("%s: Invalid bank number %d\n", __func__, bank);
+ return -EINVAL;
+ }
+ plat->bank = bank;
+ plat->base_addr = gpiobase;
+ plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
+ "bank-name", NULL);
+
+ return 0;
+}
+
+static int broadwell_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
+ struct fdtdec_phandle_args *args)
+{
+ desc->offset = args->args[0];
+ desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
+
+ return 0;
+}
+
+static const struct dm_gpio_ops gpio_broadwell_ops = {
+ .request = broadwell_gpio_request,
+ .direction_input = broadwell_gpio_direction_input,
+ .direction_output = broadwell_gpio_direction_output,
+ .get_value = broadwell_gpio_get_value,
+ .set_value = broadwell_gpio_set_value,
+ .get_function = broadwell_gpio_get_function,
+ .xlate = broadwell_gpio_xlate,
+};
+
+static const struct udevice_id intel_broadwell_gpio_ids[] = {
+ { .compatible = "intel,broadwell-gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(gpio_broadwell) = {
+ .name = "gpio_broadwell",
+ .id = UCLASS_GPIO,
+ .of_match = intel_broadwell_gpio_ids,
+ .ops = &gpio_broadwell_ops,
+ .ofdata_to_platdata = broadwell_gpio_ofdata_to_platdata,
+ .probe = broadwell_gpio_probe,
+ .priv_auto_alloc_size = sizeof(struct broadwell_bank_priv),
+ .platdata_auto_alloc_size = sizeof(struct broadwell_bank_platdata),
+};
--
2.7.0.rc3.207.g0ac5344
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