blob: c22d534da9ad6cd0d4ecd7a3ab7187d28b84edc0 [file] [log] [blame]
Tom Rini10e47792018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0
Alexander Graffce8e5c2018-01-23 18:05:21 +01002/*
3 * Copyright (C) 2018 Alexander Graf <agraf@suse.de>
4 *
5 * Based on drivers/pinctrl/mvebu/pinctrl-mvebu.c and
6 * drivers/gpio/bcm2835_gpio.c
7 *
8 * This driver gets instantiated by the GPIO driver, because both devices
9 * share the same device node.
Alexander Graffce8e5c2018-01-23 18:05:21 +010010 * https://spdx.org/licenses
11 */
12
13#include <common.h>
14#include <config.h>
15#include <errno.h>
16#include <dm.h>
Simon Glass0f2af882020-05-10 11:40:05 -060017#include <log.h>
Alexander Graffce8e5c2018-01-23 18:05:21 +010018#include <dm/pinctrl.h>
19#include <dm/root.h>
20#include <dm/device-internal.h>
21#include <dm/lists.h>
22#include <asm/system.h>
23#include <asm/io.h>
24#include <asm/gpio.h>
25
26struct bcm283x_pinctrl_priv {
27 u32 *base_reg;
28};
29
30#define MAX_PINS_PER_BANK 16
31
32static void bcm2835_gpio_set_func_id(struct udevice *dev, unsigned int gpio,
33 int func)
34{
35 struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
36 int reg_offset;
37 int field_offset;
38
39 reg_offset = BCM2835_GPIO_FSEL_BANK(gpio);
40 field_offset = BCM2835_GPIO_FSEL_SHIFT(gpio);
41
42 clrsetbits_le32(&priv->base_reg[reg_offset],
43 BCM2835_GPIO_FSEL_MASK << field_offset,
44 (func & BCM2835_GPIO_FSEL_MASK) << field_offset);
45}
46
47static int bcm2835_gpio_get_func_id(struct udevice *dev, unsigned int gpio)
48{
49 struct bcm283x_pinctrl_priv *priv = dev_get_priv(dev);
50 u32 val;
51
52 val = readl(&priv->base_reg[BCM2835_GPIO_FSEL_BANK(gpio)]);
53
54 return (val >> BCM2835_GPIO_FSEL_SHIFT(gpio) & BCM2835_GPIO_FSEL_MASK);
55}
56
57/*
58 * bcm283x_pinctrl_set_state: configure pin functions.
59 * @dev: the pinctrl device to be configured.
60 * @config: the state to be configured.
61 * @return: 0 in success
62 */
63int bcm283x_pinctrl_set_state(struct udevice *dev, struct udevice *config)
64{
65 u32 pin_arr[MAX_PINS_PER_BANK];
66 u32 function;
67 int i, len, pin_count = 0;
68
69 if (!dev_read_prop(config, "brcm,pins", &len) || !len ||
70 len & 0x3 || dev_read_u32_array(config, "brcm,pins", pin_arr,
71 len / sizeof(u32))) {
72 debug("Failed reading pins array for pinconfig %s (%d)\n",
73 config->name, len);
74 return -EINVAL;
75 }
76
77 pin_count = len / sizeof(u32);
78
79 function = dev_read_u32_default(config, "brcm,function", -1);
80 if (function < 0) {
81 debug("Failed reading function for pinconfig %s (%d)\n",
82 config->name, function);
83 return -EINVAL;
84 }
85
86 for (i = 0; i < pin_count; i++)
87 bcm2835_gpio_set_func_id(dev, pin_arr[i], function);
88
89 return 0;
90}
91
92static int bcm283x_pinctrl_get_gpio_mux(struct udevice *dev, int banknum,
93 int index)
94{
95 if (banknum != 0)
96 return -EINVAL;
97
98 return bcm2835_gpio_get_func_id(dev, index);
99}
100
101static const struct udevice_id bcm2835_pinctrl_id[] = {
102 {.compatible = "brcm,bcm2835-gpio"},
Matthias Brugger8c9901f2019-11-06 15:28:25 +0100103 {.compatible = "brcm,bcm2711-gpio"},
Alexander Graffce8e5c2018-01-23 18:05:21 +0100104 {}
105};
106
107int bcm283x_pinctl_probe(struct udevice *dev)
108{
109 struct bcm283x_pinctrl_priv *priv;
110 int ret;
111 struct udevice *pdev;
112
113 priv = dev_get_priv(dev);
114 if (!priv) {
115 debug("%s: Failed to get private\n", __func__);
116 return -EINVAL;
117 }
118
119 priv->base_reg = dev_read_addr_ptr(dev);
Sean Anderson42db70b2020-06-24 06:41:13 -0400120 if (!priv->base_reg) {
Alexander Graffce8e5c2018-01-23 18:05:21 +0100121 debug("%s: Failed to get base address\n", __func__);
122 return -EINVAL;
123 }
124
125 /* Create GPIO device as well */
126 ret = device_bind(dev, lists_driver_lookup_name("gpio_bcm2835"),
127 "gpio_bcm2835", NULL, dev_of_offset(dev), &pdev);
128 if (ret) {
129 /*
130 * While we really want the pinctrl driver to work to make
131 * devices go where they should go, the GPIO controller is
132 * not quite as crucial as it's only rarely used, so don't
133 * fail here.
134 */
135 printf("Failed to bind GPIO driver\n");
136 }
137
138 return 0;
139}
140
141static struct pinctrl_ops bcm283x_pinctrl_ops = {
142 .set_state = bcm283x_pinctrl_set_state,
143 .get_gpio_mux = bcm283x_pinctrl_get_gpio_mux,
144};
145
146U_BOOT_DRIVER(pinctrl_bcm283x) = {
147 .name = "bcm283x_pinctrl",
148 .id = UCLASS_PINCTRL,
149 .of_match = of_match_ptr(bcm2835_pinctrl_id),
150 .priv_auto_alloc_size = sizeof(struct bcm283x_pinctrl_priv),
151 .ops = &bcm283x_pinctrl_ops,
Alexander Graf7fcd3132018-01-25 12:05:56 +0100152 .probe = bcm283x_pinctl_probe,
Matthias Brugger501b6842019-11-08 14:49:48 +0100153#if !CONFIG_IS_ENABLED(OF_CONTROL) || CONFIG_IS_ENABLED(OF_BOARD)
Alexander Graf7fcd3132018-01-25 12:05:56 +0100154 .flags = DM_FLAG_PRE_RELOC,
Bin Mengc2908c62018-10-24 06:36:33 -0700155#endif
Alexander Graffce8e5c2018-01-23 18:05:21 +0100156};