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 <malloc.h>
10 #include <asm/global_data.h>
11 #include <dm/device_compat.h>
12 #include <dm/pinctrl.h>
13 #include <errno.h>
14 #include <asm/gpio.h>
15 #include <asm/io.h>
16 #include <linux/bitops.h>
17 #include "../pinctrl/renesas/sh_pfc.h"
18
19 #define GPIO_IOINTSEL 0x00 /* General IO/Interrupt Switching Register */
20 #define GPIO_INOUTSEL 0x04 /* General Input/Output Switching Register */
21 #define GPIO_OUTDT 0x08 /* General Output Register */
22 #define GPIO_INDT 0x0c /* General Input Register */
23 #define GPIO_INTDT 0x10 /* Interrupt Display Register */
24 #define GPIO_INTCLR 0x14 /* Interrupt Clear Register */
25 #define GPIO_INTMSK 0x18 /* Interrupt Mask Register */
26 #define GPIO_MSKCLR 0x1c /* Interrupt Mask Clear Register */
27 #define GPIO_POSNEG 0x20 /* Positive/Negative Logic Select Register */
28 #define GPIO_EDGLEVEL 0x24 /* Edge/level Select Register */
29 #define GPIO_FILONOFF 0x28 /* Chattering Prevention On/Off Register */
30 #define GPIO_BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */
31
32 #define RCAR_MAX_GPIO_PER_BANK 32
33
34 DECLARE_GLOBAL_DATA_PTR;
35
36 struct rcar_gpio_priv {
37 void __iomem *regs;
38 int pfc_offset;
39 };
40
rcar_gpio_get_value(struct udevice * dev,unsigned offset)41 static int rcar_gpio_get_value(struct udevice *dev, unsigned offset)
42 {
43 struct rcar_gpio_priv *priv = dev_get_priv(dev);
44 const u32 bit = BIT(offset);
45
46 /*
47 * Testing on r8a7790 shows that INDT does not show correct pin state
48 * when configured as output, so use OUTDT in case of output pins.
49 */
50 if (readl(priv->regs + GPIO_INOUTSEL) & bit)
51 return !!(readl(priv->regs + GPIO_OUTDT) & bit);
52 else
53 return !!(readl(priv->regs + GPIO_INDT) & bit);
54 }
55
rcar_gpio_set_value(struct udevice * dev,unsigned offset,int value)56 static int rcar_gpio_set_value(struct udevice *dev, unsigned offset,
57 int value)
58 {
59 struct rcar_gpio_priv *priv = dev_get_priv(dev);
60
61 if (value)
62 setbits_le32(priv->regs + GPIO_OUTDT, BIT(offset));
63 else
64 clrbits_le32(priv->regs + GPIO_OUTDT, BIT(offset));
65
66 return 0;
67 }
68
rcar_gpio_set_direction(struct udevice * dev,unsigned offset,bool output)69 static void rcar_gpio_set_direction(struct udevice *dev, unsigned offset,
70 bool output)
71 {
72 struct rcar_gpio_priv *priv = dev_get_priv(dev);
73 void __iomem *regs = priv->regs;
74
75 /*
76 * follow steps in the GPIO documentation for
77 * "Setting General Output Mode" and
78 * "Setting General Input Mode"
79 */
80
81 /* Configure postive logic in POSNEG */
82 clrbits_le32(regs + GPIO_POSNEG, BIT(offset));
83
84 /* Select "General Input/Output Mode" in IOINTSEL */
85 clrbits_le32(regs + GPIO_IOINTSEL, BIT(offset));
86
87 /* Select Input Mode or Output Mode in INOUTSEL */
88 if (output)
89 setbits_le32(regs + GPIO_INOUTSEL, BIT(offset));
90 else
91 clrbits_le32(regs + GPIO_INOUTSEL, BIT(offset));
92 }
93
rcar_gpio_direction_input(struct udevice * dev,unsigned offset)94 static int rcar_gpio_direction_input(struct udevice *dev, unsigned offset)
95 {
96 rcar_gpio_set_direction(dev, offset, false);
97
98 return 0;
99 }
100
rcar_gpio_direction_output(struct udevice * dev,unsigned offset,int value)101 static int rcar_gpio_direction_output(struct udevice *dev, unsigned offset,
102 int value)
103 {
104 /* write GPIO value to output before selecting output mode of pin */
105 rcar_gpio_set_value(dev, offset, value);
106 rcar_gpio_set_direction(dev, offset, true);
107
108 return 0;
109 }
110
rcar_gpio_get_function(struct udevice * dev,unsigned offset)111 static int rcar_gpio_get_function(struct udevice *dev, unsigned offset)
112 {
113 struct rcar_gpio_priv *priv = dev_get_priv(dev);
114
115 if (readl(priv->regs + GPIO_INOUTSEL) & BIT(offset))
116 return GPIOF_OUTPUT;
117 else
118 return GPIOF_INPUT;
119 }
120
rcar_gpio_request(struct udevice * dev,unsigned offset,const char * label)121 static int rcar_gpio_request(struct udevice *dev, unsigned offset,
122 const char *label)
123 {
124 return pinctrl_gpio_request(dev, offset);
125 }
126
rcar_gpio_free(struct udevice * dev,unsigned offset)127 static int rcar_gpio_free(struct udevice *dev, unsigned offset)
128 {
129 return pinctrl_gpio_free(dev, offset);
130 }
131
132 static const struct dm_gpio_ops rcar_gpio_ops = {
133 .request = rcar_gpio_request,
134 .rfree = rcar_gpio_free,
135 .direction_input = rcar_gpio_direction_input,
136 .direction_output = rcar_gpio_direction_output,
137 .get_value = rcar_gpio_get_value,
138 .set_value = rcar_gpio_set_value,
139 .get_function = rcar_gpio_get_function,
140 };
141
rcar_gpio_probe(struct udevice * dev)142 static int rcar_gpio_probe(struct udevice *dev)
143 {
144 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
145 struct rcar_gpio_priv *priv = dev_get_priv(dev);
146 struct fdtdec_phandle_args args;
147 struct clk clk;
148 int node = dev_of_offset(dev);
149 int ret;
150
151 priv->regs = dev_read_addr_ptr(dev);
152 uc_priv->bank_name = dev->name;
153
154 ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, node, "gpio-ranges",
155 NULL, 3, 0, &args);
156 priv->pfc_offset = ret == 0 ? args.args[1] : -1;
157 uc_priv->gpio_count = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK;
158
159 ret = clk_get_by_index(dev, 0, &clk);
160 if (ret < 0) {
161 dev_err(dev, "Failed to get GPIO bank clock\n");
162 return ret;
163 }
164
165 ret = clk_enable(&clk);
166 clk_free(&clk);
167 if (ret) {
168 dev_err(dev, "Failed to enable GPIO bank clock\n");
169 return ret;
170 }
171
172 return 0;
173 }
174
175 static const struct udevice_id rcar_gpio_ids[] = {
176 { .compatible = "renesas,gpio-r8a7795" },
177 { .compatible = "renesas,gpio-r8a7796" },
178 { .compatible = "renesas,gpio-r8a77965" },
179 { .compatible = "renesas,gpio-r8a77970" },
180 { .compatible = "renesas,gpio-r8a77990" },
181 { .compatible = "renesas,gpio-r8a77995" },
182 { .compatible = "renesas,rcar-gen2-gpio" },
183 { .compatible = "renesas,rcar-gen3-gpio" },
184 { /* sentinel */ }
185 };
186
187 U_BOOT_DRIVER(rcar_gpio) = {
188 .name = "rcar-gpio",
189 .id = UCLASS_GPIO,
190 .of_match = rcar_gpio_ids,
191 .ops = &rcar_gpio_ops,
192 .priv_auto = sizeof(struct rcar_gpio_priv),
193 .probe = rcar_gpio_probe,
194 };
195