2 * Copyright (c) 2012 The Chromium OS Authors.
3 * SPDX-License-Identifier: GPL-2.0+
16 #include <asm/arch/gpio.h>
17 #include <dt-bindings/gpio/x86-gpio.h>
19 DECLARE_GLOBAL_DATA_PTR;
22 * struct broadwell_bank_priv - Private driver data
24 * @regs: Pointer to GPIO registers
25 * @bank: Bank number for this bank (0, 1 or 2)
26 * @offset: GPIO offset for this bank (0, 32 or 64)
28 struct broadwell_bank_priv {
29 struct pch_lp_gpio_regs *regs;
34 static int broadwell_gpio_request(struct udevice *dev, unsigned offset,
37 struct broadwell_bank_priv *priv = dev_get_priv(dev);
38 struct pch_lp_gpio_regs *regs = priv->regs;
42 * Make sure that the GPIO pin we want isn't already in use for some
43 * built-in hardware function. We have to check this for every
46 debug("%s: request bank %d offset %d: ", __func__, priv->bank, offset);
47 val = inl(®s->own[priv->bank]);
48 if (!(val & (1UL << offset))) {
49 debug("gpio is reserved for internal use\n");
57 static int broadwell_gpio_direction_input(struct udevice *dev, unsigned offset)
59 struct broadwell_bank_priv *priv = dev_get_priv(dev);
60 struct pch_lp_gpio_regs *regs = priv->regs;
62 setio_32(®s->config[priv->offset + offset], CONFA_DIR_INPUT);
67 static int broadwell_gpio_get_value(struct udevice *dev, unsigned offset)
69 struct broadwell_bank_priv *priv = dev_get_priv(dev);
70 struct pch_lp_gpio_regs *regs = priv->regs;
72 return inl(®s->config[priv->offset + offset]) & CONFA_LEVEL_HIGH ?
76 static int broadwell_gpio_set_value(struct udevice *dev, unsigned offset,
79 struct broadwell_bank_priv *priv = dev_get_priv(dev);
80 struct pch_lp_gpio_regs *regs = priv->regs;
82 debug("%s: dev=%s, offset=%d, value=%d\n", __func__, dev->name, offset,
84 clrsetio_32(®s->config[priv->offset + offset], CONFA_OUTPUT_HIGH,
85 value ? CONFA_OUTPUT_HIGH : 0);
90 static int broadwell_gpio_direction_output(struct udevice *dev, unsigned offset,
93 struct broadwell_bank_priv *priv = dev_get_priv(dev);
94 struct pch_lp_gpio_regs *regs = priv->regs;
96 broadwell_gpio_set_value(dev, offset, value);
97 clrio_32(®s->config[priv->offset + offset], CONFA_DIR_INPUT);
102 static int broadwell_gpio_get_function(struct udevice *dev, unsigned offset)
104 struct broadwell_bank_priv *priv = dev_get_priv(dev);
105 struct pch_lp_gpio_regs *regs = priv->regs;
106 u32 mask = 1UL << offset;
108 if (!(inl(®s->own[priv->bank]) & mask))
110 if (inl(®s->config[priv->offset + offset]) & CONFA_DIR_INPUT)
116 static int broadwell_gpio_probe(struct udevice *dev)
118 struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
119 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
120 struct broadwell_bank_priv *priv = dev_get_priv(dev);
122 uc_priv->gpio_count = GPIO_PER_BANK;
123 uc_priv->bank_name = plat->bank_name;
125 priv->regs = (struct pch_lp_gpio_regs *)(uintptr_t)plat->base_addr;
126 priv->bank = plat->bank;
127 priv->offset = priv->bank * 32;
128 debug("%s: probe done, regs %p, bank %d\n", __func__, priv->regs,
134 static int broadwell_gpio_ofdata_to_platdata(struct udevice *dev)
136 struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
141 ret = pch_get_gpio_base(dev->parent, &gpiobase);
145 bank = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
147 debug("%s: Invalid bank number %d\n", __func__, bank);
151 plat->base_addr = gpiobase;
152 plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
158 static const struct dm_gpio_ops gpio_broadwell_ops = {
159 .request = broadwell_gpio_request,
160 .direction_input = broadwell_gpio_direction_input,
161 .direction_output = broadwell_gpio_direction_output,
162 .get_value = broadwell_gpio_get_value,
163 .set_value = broadwell_gpio_set_value,
164 .get_function = broadwell_gpio_get_function,
167 static const struct udevice_id intel_broadwell_gpio_ids[] = {
168 { .compatible = "intel,broadwell-gpio" },
172 U_BOOT_DRIVER(gpio_broadwell) = {
173 .name = "gpio_broadwell",
175 .of_match = intel_broadwell_gpio_ids,
176 .ops = &gpio_broadwell_ops,
177 .ofdata_to_platdata = broadwell_gpio_ofdata_to_platdata,
178 .probe = broadwell_gpio_probe,
179 .priv_auto_alloc_size = sizeof(struct broadwell_bank_priv),
180 .platdata_auto_alloc_size = sizeof(struct broadwell_bank_platdata),