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authorSimon Glass <sjg@chromium.org>2016-03-11 22:07:27 -0700
committerBin Meng <bmeng.cn@gmail.com>2016-03-17 10:27:26 +0800
commit64b179770fff721d7b1e4de551148868f9e808fe (patch)
tree4d765082f0318421589a4bbf50815d8d97f70b37 /drivers/gpio/intel_broadwell_gpio.c
parent2627c7e2c100c702d540a277aa578176516d3a7c (diff)
downloadtalos-obmc-uboot-64b179770fff721d7b1e4de551148868f9e808fe.tar.gz
talos-obmc-uboot-64b179770fff721d7b1e4de551148868f9e808fe.zip
x86: broadwell: Add a GPIO driver
Add a GPIO driver for the GPIO peripheral found on broadwell devices. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'drivers/gpio/intel_broadwell_gpio.c')
-rw-r--r--drivers/gpio/intel_broadwell_gpio.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/gpio/intel_broadwell_gpio.c b/drivers/gpio/intel_broadwell_gpio.c
new file mode 100644
index 0000000000..8cf76f96c2
--- /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(&regs->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_32(&regs->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(&regs->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_32(&regs->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_32(&regs->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(&regs->own[priv->bank]) & mask))
+ return GPIOF_FUNC;
+ if (inl(&regs->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),
+};
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