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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com> */ #include <common.h> #include <clk.h> #include <dm.h> #include <dm/pinctrl.h> #include <errno.h> #include <asm/gpio.h> #include <asm/io.h> #include "../pinctrl/renesas/sh_pfc.h" #define GPIO_IOINTSEL 0x00 /* General IO/Interrupt Switching Register */ #define GPIO_INOUTSEL 0x04 /* General Input/Output Switching Register */ #define GPIO_OUTDT 0x08 /* General Output Register */ #define GPIO_INDT 0x0c /* General Input Register */ #define GPIO_INTDT 0x10 /* Interrupt Display Register */ #define GPIO_INTCLR 0x14 /* Interrupt Clear Register */ #define GPIO_INTMSK 0x18 /* Interrupt Mask Register */ #define GPIO_MSKCLR 0x1c /* Interrupt Mask Clear Register */ #define GPIO_POSNEG 0x20 /* Positive/Negative Logic Select Register */ #define GPIO_EDGLEVEL 0x24 /* Edge/level Select Register */ #define GPIO_FILONOFF 0x28 /* Chattering Prevention On/Off Register */ #define GPIO_BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */ #define RCAR_MAX_GPIO_PER_BANK 32 DECLARE_GLOBAL_DATA_PTR; struct rcar_gpio_priv { void __iomem *regs; int pfc_offset; }; static int rcar_gpio_get_value(struct udevice *dev, unsigned offset) { struct rcar_gpio_priv *priv = dev_get_priv(dev); const u32 bit = BIT(offset); /* * Testing on r8a7790 shows that INDT does not show correct pin state * when configured as output, so use OUTDT in case of output pins. */ if (readl(priv->regs + GPIO_INOUTSEL) & bit) return !!(readl(priv->regs + GPIO_OUTDT) & bit); else return !!(readl(priv->regs + GPIO_INDT) & bit); } static int rcar_gpio_set_value(struct udevice *dev, unsigned offset, int value) { struct rcar_gpio_priv *priv = dev_get_priv(dev); if (value) setbits_le32(priv->regs + GPIO_OUTDT, BIT(offset)); else clrbits_le32(priv->regs + GPIO_OUTDT, BIT(offset)); return 0; } static void rcar_gpio_set_direction(void __iomem *regs, unsigned offset, bool output) { /* * follow steps in the GPIO documentation for * "Setting General Output Mode" and * "Setting General Input Mode" */ /* Configure postive logic in POSNEG */ clrbits_le32(regs + GPIO_POSNEG, BIT(offset)); /* Select "General Input/Output Mode" in IOINTSEL */ clrbits_le32(regs + GPIO_IOINTSEL, BIT(offset)); /* Select Input Mode or Output Mode in INOUTSEL */ if (output) setbits_le32(regs + GPIO_INOUTSEL, BIT(offset)); else clrbits_le32(regs + GPIO_INOUTSEL, BIT(offset)); } static int rcar_gpio_direction_input(struct udevice *dev, unsigned offset) { struct rcar_gpio_priv *priv = dev_get_priv(dev); rcar_gpio_set_direction(priv->regs, offset, false); return 0; } static int rcar_gpio_direction_output(struct udevice *dev, unsigned offset, int value) { struct rcar_gpio_priv *priv = dev_get_priv(dev); /* write GPIO value to output before selecting output mode of pin */ rcar_gpio_set_value(dev, offset, value); rcar_gpio_set_direction(priv->regs, offset, true); return 0; } static int rcar_gpio_get_function(struct udevice *dev, unsigned offset) { struct rcar_gpio_priv *priv = dev_get_priv(dev); if (readl(priv->regs + GPIO_INOUTSEL) & BIT(offset)) return GPIOF_OUTPUT; else return GPIOF_INPUT; } static int rcar_gpio_request(struct udevice *dev, unsigned offset, const char *label) { return pinctrl_gpio_request(dev, offset); } static int rcar_gpio_free(struct udevice *dev, unsigned offset) { return pinctrl_gpio_free(dev, offset); } static const struct dm_gpio_ops rcar_gpio_ops = { .request = rcar_gpio_request, .free = rcar_gpio_free, .direction_input = rcar_gpio_direction_input, .direction_output = rcar_gpio_direction_output, .get_value = rcar_gpio_get_value, .set_value = rcar_gpio_set_value, .get_function = rcar_gpio_get_function, }; static int rcar_gpio_probe(struct udevice *dev) { struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); struct rcar_gpio_priv *priv = dev_get_priv(dev); struct fdtdec_phandle_args args; struct clk clk; int node = dev_of_offset(dev); int ret; priv->regs = (void __iomem *)devfdt_get_addr(dev); uc_priv->bank_name = dev->name; ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges", NULL, 3, 0, &args); priv->pfc_offset = ret == 0 ? args.args[1] : -1; uc_priv->gpio_count = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK; ret = clk_get_by_index(dev, 0, &clk); if (ret < 0) { dev_err(dev, "Failed to get GPIO bank clock\n"); return ret; } ret = clk_enable(&clk); clk_free(&clk); if (ret) { dev_err(dev, "Failed to enable GPIO bank clock\n"); return ret; } return 0; } static const struct udevice_id rcar_gpio_ids[] = { { .compatible = "renesas,gpio-r8a7795" }, { .compatible = "renesas,gpio-r8a7796" }, { .compatible = "renesas,gpio-r8a77965" }, { .compatible = "renesas,gpio-r8a77970" }, { .compatible = "renesas,gpio-r8a77990" }, { .compatible = "renesas,gpio-r8a77995" }, { .compatible = "renesas,rcar-gen2-gpio" }, { .compatible = "renesas,rcar-gen3-gpio" }, { /* sentinel */ } }; U_BOOT_DRIVER(rcar_gpio) = { .name = "rcar-gpio", .id = UCLASS_GPIO, .of_match = rcar_gpio_ids, .ops = &rcar_gpio_ops, .priv_auto_alloc_size = sizeof(struct rcar_gpio_priv), .probe = rcar_gpio_probe, }; |