1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com> 4 */ 5 6 #include <common.h> 7 #include <clk.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <asm/gpio.h> 11 #include <asm/io.h> 12 #include "../pinctrl/renesas/sh_pfc.h" 13 14 #define GPIO_IOINTSEL 0x00 /* General IO/Interrupt Switching Register */ 15 #define GPIO_INOUTSEL 0x04 /* General Input/Output Switching Register */ 16 #define GPIO_OUTDT 0x08 /* General Output Register */ 17 #define GPIO_INDT 0x0c /* General Input Register */ 18 #define GPIO_INTDT 0x10 /* Interrupt Display Register */ 19 #define GPIO_INTCLR 0x14 /* Interrupt Clear Register */ 20 #define GPIO_INTMSK 0x18 /* Interrupt Mask Register */ 21 #define GPIO_MSKCLR 0x1c /* Interrupt Mask Clear Register */ 22 #define GPIO_POSNEG 0x20 /* Positive/Negative Logic Select Register */ 23 #define GPIO_EDGLEVEL 0x24 /* Edge/level Select Register */ 24 #define GPIO_FILONOFF 0x28 /* Chattering Prevention On/Off Register */ 25 #define GPIO_BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */ 26 27 #define RCAR_MAX_GPIO_PER_BANK 32 28 29 DECLARE_GLOBAL_DATA_PTR; 30 31 struct rcar_gpio_priv { 32 void __iomem *regs; 33 int pfc_offset; 34 }; 35 36 static int rcar_gpio_get_value(struct udevice *dev, unsigned offset) 37 { 38 struct rcar_gpio_priv *priv = dev_get_priv(dev); 39 const u32 bit = BIT(offset); 40 41 /* 42 * Testing on r8a7790 shows that INDT does not show correct pin state 43 * when configured as output, so use OUTDT in case of output pins. 44 */ 45 if (readl(priv->regs + GPIO_INOUTSEL) & bit) 46 return !!(readl(priv->regs + GPIO_OUTDT) & bit); 47 else 48 return !!(readl(priv->regs + GPIO_INDT) & bit); 49 } 50 51 static int rcar_gpio_set_value(struct udevice *dev, unsigned offset, 52 int value) 53 { 54 struct rcar_gpio_priv *priv = dev_get_priv(dev); 55 56 if (value) 57 setbits_le32(priv->regs + GPIO_OUTDT, BIT(offset)); 58 else 59 clrbits_le32(priv->regs + GPIO_OUTDT, BIT(offset)); 60 61 return 0; 62 } 63 64 static void rcar_gpio_set_direction(void __iomem *regs, unsigned offset, 65 bool output) 66 { 67 /* 68 * follow steps in the GPIO documentation for 69 * "Setting General Output Mode" and 70 * "Setting General Input Mode" 71 */ 72 73 /* Configure postive logic in POSNEG */ 74 clrbits_le32(regs + GPIO_POSNEG, BIT(offset)); 75 76 /* Select "General Input/Output Mode" in IOINTSEL */ 77 clrbits_le32(regs + GPIO_IOINTSEL, BIT(offset)); 78 79 /* Select Input Mode or Output Mode in INOUTSEL */ 80 if (output) 81 setbits_le32(regs + GPIO_INOUTSEL, BIT(offset)); 82 else 83 clrbits_le32(regs + GPIO_INOUTSEL, BIT(offset)); 84 } 85 86 static int rcar_gpio_direction_input(struct udevice *dev, unsigned offset) 87 { 88 struct rcar_gpio_priv *priv = dev_get_priv(dev); 89 90 rcar_gpio_set_direction(priv->regs, offset, false); 91 92 return 0; 93 } 94 95 static int rcar_gpio_direction_output(struct udevice *dev, unsigned offset, 96 int value) 97 { 98 struct rcar_gpio_priv *priv = dev_get_priv(dev); 99 100 /* write GPIO value to output before selecting output mode of pin */ 101 rcar_gpio_set_value(dev, offset, value); 102 rcar_gpio_set_direction(priv->regs, offset, true); 103 104 return 0; 105 } 106 107 static int rcar_gpio_get_function(struct udevice *dev, unsigned offset) 108 { 109 struct rcar_gpio_priv *priv = dev_get_priv(dev); 110 111 if (readl(priv->regs + GPIO_INOUTSEL) & BIT(offset)) 112 return GPIOF_OUTPUT; 113 else 114 return GPIOF_INPUT; 115 } 116 117 static int rcar_gpio_request(struct udevice *dev, unsigned offset, 118 const char *label) 119 { 120 struct rcar_gpio_priv *priv = dev_get_priv(dev); 121 struct udevice *pctldev; 122 int ret; 123 124 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev); 125 if (ret) 126 return ret; 127 128 return sh_pfc_config_mux_for_gpio(pctldev, priv->pfc_offset + offset); 129 } 130 131 static const struct dm_gpio_ops rcar_gpio_ops = { 132 .request = rcar_gpio_request, 133 .direction_input = rcar_gpio_direction_input, 134 .direction_output = rcar_gpio_direction_output, 135 .get_value = rcar_gpio_get_value, 136 .set_value = rcar_gpio_set_value, 137 .get_function = rcar_gpio_get_function, 138 }; 139 140 static int rcar_gpio_probe(struct udevice *dev) 141 { 142 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); 143 struct rcar_gpio_priv *priv = dev_get_priv(dev); 144 struct fdtdec_phandle_args args; 145 struct clk clk; 146 int node = dev_of_offset(dev); 147 int ret; 148 149 priv->regs = (void __iomem *)devfdt_get_addr(dev); 150 uc_priv->bank_name = dev->name; 151 152 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges", 153 NULL, 3, 0, &args); 154 priv->pfc_offset = ret == 0 ? args.args[1] : -1; 155 uc_priv->gpio_count = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK; 156 157 ret = clk_get_by_index(dev, 0, &clk); 158 if (ret < 0) { 159 dev_err(dev, "Failed to get GPIO bank clock\n"); 160 return ret; 161 } 162 163 ret = clk_enable(&clk); 164 clk_free(&clk); 165 if (ret) { 166 dev_err(dev, "Failed to enable GPIO bank clock\n"); 167 return ret; 168 } 169 170 return 0; 171 } 172 173 static const struct udevice_id rcar_gpio_ids[] = { 174 { .compatible = "renesas,gpio-r8a7795" }, 175 { .compatible = "renesas,gpio-r8a7796" }, 176 { .compatible = "renesas,gpio-r8a77965" }, 177 { .compatible = "renesas,gpio-r8a77970" }, 178 { .compatible = "renesas,gpio-r8a77995" }, 179 { .compatible = "renesas,rcar-gen2-gpio" }, 180 { .compatible = "renesas,rcar-gen3-gpio" }, 181 { /* sentinel */ } 182 }; 183 184 U_BOOT_DRIVER(rcar_gpio) = { 185 .name = "rcar-gpio", 186 .id = UCLASS_GPIO, 187 .of_match = rcar_gpio_ids, 188 .ops = &rcar_gpio_ops, 189 .priv_auto_alloc_size = sizeof(struct rcar_gpio_priv), 190 .probe = rcar_gpio_probe, 191 }; 192