2 * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
4 * SPDX-License-Identifier: GPL-2.0+
13 #include "../pinctrl/renesas/sh_pfc.h"
15 #define GPIO_IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
16 #define GPIO_INOUTSEL 0x04 /* General Input/Output Switching Register */
17 #define GPIO_OUTDT 0x08 /* General Output Register */
18 #define GPIO_INDT 0x0c /* General Input Register */
19 #define GPIO_INTDT 0x10 /* Interrupt Display Register */
20 #define GPIO_INTCLR 0x14 /* Interrupt Clear Register */
21 #define GPIO_INTMSK 0x18 /* Interrupt Mask Register */
22 #define GPIO_MSKCLR 0x1c /* Interrupt Mask Clear Register */
23 #define GPIO_POSNEG 0x20 /* Positive/Negative Logic Select Register */
24 #define GPIO_EDGLEVEL 0x24 /* Edge/level Select Register */
25 #define GPIO_FILONOFF 0x28 /* Chattering Prevention On/Off Register */
26 #define GPIO_BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
28 #define RCAR_MAX_GPIO_PER_BANK 32
30 DECLARE_GLOBAL_DATA_PTR;
32 struct rcar_gpio_priv {
37 static int rcar_gpio_get_value(struct udevice *dev, unsigned offset)
39 struct rcar_gpio_priv *priv = dev_get_priv(dev);
40 const u32 bit = BIT(offset);
43 * Testing on r8a7790 shows that INDT does not show correct pin state
44 * when configured as output, so use OUTDT in case of output pins.
46 if (readl(priv->regs + GPIO_INOUTSEL) & bit)
47 return !!(readl(priv->regs + GPIO_OUTDT) & bit);
49 return !!(readl(priv->regs + GPIO_INDT) & bit);
52 static int rcar_gpio_set_value(struct udevice *dev, unsigned offset,
55 struct rcar_gpio_priv *priv = dev_get_priv(dev);
58 setbits_le32(priv->regs + GPIO_OUTDT, BIT(offset));
60 clrbits_le32(priv->regs + GPIO_OUTDT, BIT(offset));
65 static void rcar_gpio_set_direction(void __iomem *regs, unsigned offset,
69 * follow steps in the GPIO documentation for
70 * "Setting General Output Mode" and
71 * "Setting General Input Mode"
74 /* Configure postive logic in POSNEG */
75 clrbits_le32(regs + GPIO_POSNEG, BIT(offset));
77 /* Select "General Input/Output Mode" in IOINTSEL */
78 clrbits_le32(regs + GPIO_IOINTSEL, BIT(offset));
80 /* Select Input Mode or Output Mode in INOUTSEL */
82 setbits_le32(regs + GPIO_INOUTSEL, BIT(offset));
84 clrbits_le32(regs + GPIO_INOUTSEL, BIT(offset));
87 static int rcar_gpio_direction_input(struct udevice *dev, unsigned offset)
89 struct rcar_gpio_priv *priv = dev_get_priv(dev);
91 rcar_gpio_set_direction(priv->regs, offset, false);
96 static int rcar_gpio_direction_output(struct udevice *dev, unsigned offset,
99 struct rcar_gpio_priv *priv = dev_get_priv(dev);
101 /* write GPIO value to output before selecting output mode of pin */
102 rcar_gpio_set_value(dev, offset, value);
103 rcar_gpio_set_direction(priv->regs, offset, true);
108 static int rcar_gpio_get_function(struct udevice *dev, unsigned offset)
110 struct rcar_gpio_priv *priv = dev_get_priv(dev);
112 if (readl(priv->regs + GPIO_INOUTSEL) & BIT(offset))
118 static int rcar_gpio_request(struct udevice *dev, unsigned offset,
121 struct rcar_gpio_priv *priv = dev_get_priv(dev);
122 struct udevice *pctldev;
125 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
129 return sh_pfc_config_mux_for_gpio(pctldev, priv->pfc_offset + offset);
132 static const struct dm_gpio_ops rcar_gpio_ops = {
133 .request = rcar_gpio_request,
134 .direction_input = rcar_gpio_direction_input,
135 .direction_output = rcar_gpio_direction_output,
136 .get_value = rcar_gpio_get_value,
137 .set_value = rcar_gpio_set_value,
138 .get_function = rcar_gpio_get_function,
141 static int rcar_gpio_probe(struct udevice *dev)
143 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
144 struct rcar_gpio_priv *priv = dev_get_priv(dev);
145 struct fdtdec_phandle_args args;
147 int node = dev_of_offset(dev);
150 priv->regs = (void __iomem *)devfdt_get_addr(dev);
151 uc_priv->bank_name = dev->name;
153 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
155 priv->pfc_offset = ret == 0 ? args.args[1] : -1;
156 uc_priv->gpio_count = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
158 ret = clk_get_by_index(dev, 0, &clk);
160 dev_err(dev, "Failed to get GPIO bank clock\n");
164 ret = clk_enable(&clk);
167 dev_err(dev, "Failed to enable GPIO bank clock\n");
174 static const struct udevice_id rcar_gpio_ids[] = {
175 { .compatible = "renesas,gpio-r8a7795" },
176 { .compatible = "renesas,gpio-r8a7796" },
177 { .compatible = "renesas,gpio-r8a77965" },
178 { .compatible = "renesas,gpio-r8a77970" },
179 { .compatible = "renesas,gpio-r8a77995" },
180 { .compatible = "renesas,rcar-gen2-gpio" },
181 { .compatible = "renesas,rcar-gen3-gpio" },
185 U_BOOT_DRIVER(rcar_gpio) = {
188 .of_match = rcar_gpio_ids,
189 .ops = &rcar_gpio_ops,
190 .priv_auto_alloc_size = sizeof(struct rcar_gpio_priv),
191 .probe = rcar_gpio_probe,