1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Exynos pinctrl driver common code.
4 * Copyright (C) 2016 Samsung Electronics
5 * Thomas Abraham <thomas.ab@samsung.com>
6 */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <asm/global_data.h>
12 #include <asm/io.h>
13 #include "pinctrl-exynos.h"
14
15 DECLARE_GLOBAL_DATA_PTR;
16
17 /**
18 * exynos_pinctrl_setup_peri: setup pinctrl for a peripheral.
19 * conf: soc specific pin configuration data array
20 * num_conf: number of configurations in the conf array.
21 * base: base address of the pin controller.
22 */
exynos_pinctrl_setup_peri(struct exynos_pinctrl_config_data * conf,unsigned int num_conf,unsigned long base)23 void exynos_pinctrl_setup_peri(struct exynos_pinctrl_config_data *conf,
24 unsigned int num_conf, unsigned long base)
25 {
26 unsigned int idx, val;
27
28 for (idx = 0; idx < num_conf; idx++) {
29 val = readl(base + conf[idx].offset);
30 val &= ~(conf[idx].mask);
31 val |= conf[idx].value;
32 writel(val, base + conf[idx].offset);
33 }
34 }
35
36 /* given a pin-name, return the address of pin config registers */
pin_to_bank_base(struct udevice * dev,const char * pin_name,u32 * pin)37 static unsigned long pin_to_bank_base(struct udevice *dev, const char *pin_name,
38 u32 *pin)
39 {
40 struct exynos_pinctrl_priv *priv = dev_get_priv(dev);
41 const struct samsung_pin_ctrl *pin_ctrl = priv->pin_ctrl;
42 const struct samsung_pin_bank_data *bank_data = pin_ctrl->pin_banks;
43 u32 nr_banks = pin_ctrl->nr_banks, idx = 0;
44 char bank[10];
45
46 /*
47 * The format of the pin name is <bank name>-<pin_number>.
48 * Example: gpa0-4 (gpa0 is the bank name and 4 is the pin number.
49 */
50 while (pin_name[idx] != '-') {
51 bank[idx] = pin_name[idx];
52 idx++;
53 }
54 bank[idx] = '\0';
55 *pin = pin_name[++idx] - '0';
56
57 /* lookup the pin bank data using the pin bank name */
58 for (idx = 0; idx < nr_banks; idx++)
59 if (!strcmp(bank, bank_data[idx].name))
60 break;
61
62 return priv->base + bank_data[idx].offset;
63 }
64
65 /**
66 * exynos_pinctrl_set_state: configure a pin state.
67 * dev: the pinctrl device to be configured.
68 * config: the state to be configured.
69 */
exynos_pinctrl_set_state(struct udevice * dev,struct udevice * config)70 int exynos_pinctrl_set_state(struct udevice *dev, struct udevice *config)
71 {
72 const void *fdt = gd->fdt_blob;
73 int node = dev_of_offset(config);
74 unsigned int count, idx, pin_num;
75 unsigned int pinfunc, pinpud, pindrv;
76 unsigned long reg, value;
77 const char *name;
78
79 /*
80 * refer to the following document for the pinctrl bindings
81 * linux/Documentation/devicetree/bindings/pinctrl/samsung-pinctrl.txt
82 */
83 count = fdt_stringlist_count(fdt, node, "samsung,pins");
84 if (count <= 0)
85 return -EINVAL;
86
87 pinfunc = fdtdec_get_int(fdt, node, "samsung,pin-function", -1);
88 pinpud = fdtdec_get_int(fdt, node, "samsung,pin-pud", -1);
89 pindrv = fdtdec_get_int(fdt, node, "samsung,pin-drv", -1);
90
91 for (idx = 0; idx < count; idx++) {
92 name = fdt_stringlist_get(fdt, node, "samsung,pins", idx, NULL);
93 if (!name)
94 continue;
95 reg = pin_to_bank_base(dev, name, &pin_num);
96
97 if (pinfunc != -1) {
98 value = readl(reg + PIN_CON);
99 value &= ~(0xf << (pin_num << 2));
100 value |= (pinfunc << (pin_num << 2));
101 writel(value, reg + PIN_CON);
102 }
103
104 if (pinpud != -1) {
105 value = readl(reg + PIN_PUD);
106 value &= ~(0x3 << (pin_num << 1));
107 value |= (pinpud << (pin_num << 1));
108 writel(value, reg + PIN_PUD);
109 }
110
111 if (pindrv != -1) {
112 value = readl(reg + PIN_DRV);
113 value &= ~(0x3 << (pin_num << 1));
114 value |= (pindrv << (pin_num << 1));
115 writel(value, reg + PIN_DRV);
116 }
117 }
118
119 return 0;
120 }
121
exynos_pinctrl_probe(struct udevice * dev)122 int exynos_pinctrl_probe(struct udevice *dev)
123 {
124 struct exynos_pinctrl_priv *priv;
125 fdt_addr_t base;
126
127 priv = dev_get_priv(dev);
128 if (!priv)
129 return -EINVAL;
130
131 base = dev_read_addr(dev);
132 if (base == FDT_ADDR_T_NONE)
133 return -EINVAL;
134
135 priv->base = base;
136 priv->pin_ctrl = (struct samsung_pin_ctrl *)dev_get_driver_data(dev) +
137 dev_seq(dev);
138
139 return 0;
140 }
141