blob: bb77371bf3187f5adde7744ce425b9080fdda796 [file] [log] [blame]
Yann Gautierd0ca7f42018-07-13 21:33:09 +02001/*
Yann Gautier1a3fc9f2019-01-17 14:35:22 +01002 * Copyright (c) 2016-2019, STMicroelectronics - All Rights Reserved
Yann Gautierd0ca7f42018-07-13 21:33:09 +02003 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
Yann Gautier038bff22019-01-17 19:17:47 +01007#include <assert.h>
8#include <errno.h>
Yann Gautierd0ca7f42018-07-13 21:33:09 +02009#include <stdbool.h>
Antonio Nino Diaze0f90632018-12-14 00:18:21 +000010
Yann Gautier038bff22019-01-17 19:17:47 +010011#include <libfdt.h>
12
13#include <platform_def.h>
14
Antonio Nino Diaze0f90632018-12-14 00:18:21 +000015#include <common/bl_common.h>
16#include <common/debug.h>
17#include <drivers/st/stm32_gpio.h>
Yann Gautier4d429472019-02-14 11:15:20 +010018#include <drivers/st/stm32mp_clkfunc.h>
Antonio Nino Diaze0f90632018-12-14 00:18:21 +000019#include <lib/mmio.h>
Yann Gautier038bff22019-01-17 19:17:47 +010020#include <lib/utils_def.h>
Yann Gautierd0ca7f42018-07-13 21:33:09 +020021
Yann Gautier038bff22019-01-17 19:17:47 +010022#define DT_GPIO_BANK_SHIFT 12
23#define DT_GPIO_BANK_MASK GENMASK(16, 12)
24#define DT_GPIO_PIN_SHIFT 8
25#define DT_GPIO_PIN_MASK GENMASK(11, 8)
26#define DT_GPIO_MODE_MASK GENMASK(7, 0)
27
28/*******************************************************************************
29 * This function gets GPIO bank node in DT.
30 * Returns node offset if status is okay in DT, else return 0
31 ******************************************************************************/
32static int ckeck_gpio_bank(void *fdt, uint32_t bank, int pinctrl_node)
Yann Gautierd0ca7f42018-07-13 21:33:09 +020033{
Yann Gautier038bff22019-01-17 19:17:47 +010034 int pinctrl_subnode;
35 uint32_t bank_offset = stm32_get_gpio_bank_offset(bank);
Yann Gautierd0ca7f42018-07-13 21:33:09 +020036
Yann Gautier038bff22019-01-17 19:17:47 +010037 fdt_for_each_subnode(pinctrl_subnode, fdt, pinctrl_node) {
38 const fdt32_t *cuint;
39
40 if (fdt_getprop(fdt, pinctrl_subnode,
41 "gpio-controller", NULL) == NULL) {
42 continue;
43 }
44
45 cuint = fdt_getprop(fdt, pinctrl_subnode, "reg", NULL);
46 if (cuint == NULL) {
47 continue;
48 }
49
50 if ((fdt32_to_cpu(*cuint) == bank_offset) &&
51 (fdt_get_status(pinctrl_subnode) != DT_DISABLED)) {
52 return pinctrl_subnode;
53 }
Yann Gautierd0ca7f42018-07-13 21:33:09 +020054 }
55
Yann Gautier038bff22019-01-17 19:17:47 +010056 return 0;
Yann Gautierd0ca7f42018-07-13 21:33:09 +020057}
58
Yann Gautier038bff22019-01-17 19:17:47 +010059/*******************************************************************************
60 * This function gets the pin settings from DT information.
61 * When analyze and parsing is done, set the GPIO registers.
62 * Returns 0 on success and a negative FDT error code on failure.
63 ******************************************************************************/
64static int dt_set_gpio_config(void *fdt, int node, uint8_t status)
Yann Gautierd0ca7f42018-07-13 21:33:09 +020065{
Yann Gautier038bff22019-01-17 19:17:47 +010066 const fdt32_t *cuint, *slewrate;
67 int len;
68 int pinctrl_node;
69 uint32_t i;
70 uint32_t speed = GPIO_SPEED_LOW;
71 uint32_t pull = GPIO_NO_PULL;
Yann Gautierd0ca7f42018-07-13 21:33:09 +020072
Yann Gautier038bff22019-01-17 19:17:47 +010073 cuint = fdt_getprop(fdt, node, "pinmux", &len);
74 if (cuint == NULL) {
75 return -FDT_ERR_NOTFOUND;
Yann Gautierd0ca7f42018-07-13 21:33:09 +020076 }
77
Yann Gautier038bff22019-01-17 19:17:47 +010078 pinctrl_node = fdt_parent_offset(fdt, fdt_parent_offset(fdt, node));
79 if (pinctrl_node < 0) {
80 return -FDT_ERR_NOTFOUND;
81 }
82
83 slewrate = fdt_getprop(fdt, node, "slew-rate", NULL);
84 if (slewrate != NULL) {
85 speed = fdt32_to_cpu(*slewrate);
86 }
87
88 if (fdt_getprop(fdt, node, "bias-pull-up", NULL) != NULL) {
89 pull = GPIO_PULL_UP;
90 } else if (fdt_getprop(fdt, node, "bias-pull-down", NULL) != NULL) {
91 pull = GPIO_PULL_DOWN;
Yann Gautierd0ca7f42018-07-13 21:33:09 +020092 } else {
Yann Gautier038bff22019-01-17 19:17:47 +010093 VERBOSE("No bias configured in node %d\n", node);
Yann Gautierd0ca7f42018-07-13 21:33:09 +020094 }
95
Yann Gautier038bff22019-01-17 19:17:47 +010096 for (i = 0U; i < ((uint32_t)len / sizeof(uint32_t)); i++) {
97 uint32_t pincfg;
98 uint32_t bank;
99 uint32_t pin;
100 uint32_t mode;
101 uint32_t alternate = GPIO_ALTERNATE_(0);
102 int bank_node;
103 int clk;
104
105 pincfg = fdt32_to_cpu(*cuint);
106 cuint++;
107
108 bank = (pincfg & DT_GPIO_BANK_MASK) >> DT_GPIO_BANK_SHIFT;
109
110 pin = (pincfg & DT_GPIO_PIN_MASK) >> DT_GPIO_PIN_SHIFT;
111
112 mode = pincfg & DT_GPIO_MODE_MASK;
113
114 switch (mode) {
115 case 0:
116 mode = GPIO_MODE_INPUT;
117 break;
118 case 1 ... 16:
119 alternate = mode - 1U;
120 mode = GPIO_MODE_ALTERNATE;
121 break;
122 case 17:
123 mode = GPIO_MODE_ANALOG;
124 break;
125 default:
126 mode = GPIO_MODE_OUTPUT;
127 break;
128 }
129
130 if (fdt_getprop(fdt, node, "drive-open-drain", NULL) != NULL) {
131 mode |= GPIO_OPEN_DRAIN;
132 }
133
134 bank_node = ckeck_gpio_bank(fdt, bank, pinctrl_node);
135 if (bank_node == 0) {
136 ERROR("PINCTRL inconsistent in DT\n");
137 panic();
138 }
139
140 clk = fdt_get_clock_id(bank_node);
141 if (clk < 0) {
142 return -FDT_ERR_NOTFOUND;
143 }
144
145 /* Platform knows the clock: assert it is okay */
146 assert((unsigned long)clk == stm32_get_gpio_bank_clock(bank));
147
148 set_gpio(bank, pin, mode, speed, pull, alternate, status);
149 }
150
151 return 0;
152}
153
154/*******************************************************************************
155 * This function gets the pin settings from DT information.
156 * When analyze and parsing is done, set the GPIO registers.
157 * Returns 0 on success and a negative FDT/ERRNO error code on failure.
158 ******************************************************************************/
159int dt_set_pinctrl_config(int node)
160{
161 const fdt32_t *cuint;
162 int lenp = 0;
163 uint32_t i;
164 uint8_t status = fdt_get_status(node);
165 void *fdt;
166
167 if (fdt_get_address(&fdt) == 0) {
Nicolas Le Bayonc5c69452019-09-11 15:58:31 +0200168 return -FDT_ERR_NOTFOUND;
Yann Gautier038bff22019-01-17 19:17:47 +0100169 }
170
171 if (status == DT_DISABLED) {
172 return -FDT_ERR_NOTFOUND;
173 }
174
175 cuint = fdt_getprop(fdt, node, "pinctrl-0", &lenp);
176 if (cuint == NULL) {
177 return -FDT_ERR_NOTFOUND;
178 }
179
180 for (i = 0; i < ((uint32_t)lenp / 4U); i++) {
181 int p_node, p_subnode;
182
183 p_node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint));
184 if (p_node < 0) {
185 return -FDT_ERR_NOTFOUND;
186 }
187
188 fdt_for_each_subnode(p_subnode, fdt, p_node) {
189 int ret = dt_set_gpio_config(fdt, p_subnode, status);
190
191 if (ret < 0) {
192 return ret;
193 }
194 }
195
196 cuint++;
197 }
198
199 return 0;
200}
201
202void set_gpio(uint32_t bank, uint32_t pin, uint32_t mode, uint32_t speed,
203 uint32_t pull, uint32_t alternate, uint8_t status)
204{
205 uintptr_t base = stm32_get_gpio_bank_base(bank);
206 unsigned long clock = stm32_get_gpio_bank_clock(bank);
207
208 assert(pin <= GPIO_PIN_MAX);
209
Yann Gautiera2e2a302019-02-14 11:13:39 +0100210 stm32mp_clk_enable(clock);
Yann Gautier038bff22019-01-17 19:17:47 +0100211
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100212 mmio_clrbits_32(base + GPIO_MODE_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200213 ((uint32_t)GPIO_MODE_MASK << (pin << 1)));
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100214 mmio_setbits_32(base + GPIO_MODE_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200215 (mode & ~GPIO_OPEN_DRAIN) << (pin << 1));
216
217 if ((mode & GPIO_OPEN_DRAIN) != 0U) {
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100218 mmio_setbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
219 } else {
220 mmio_clrbits_32(base + GPIO_TYPE_OFFSET, BIT(pin));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200221 }
222
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100223 mmio_clrbits_32(base + GPIO_SPEED_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200224 ((uint32_t)GPIO_SPEED_MASK << (pin << 1)));
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100225 mmio_setbits_32(base + GPIO_SPEED_OFFSET, speed << (pin << 1));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200226
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100227 mmio_clrbits_32(base + GPIO_PUPD_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200228 ((uint32_t)GPIO_PULL_MASK << (pin << 1)));
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100229 mmio_setbits_32(base + GPIO_PUPD_OFFSET, pull << (pin << 1));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200230
231 if (pin < GPIO_ALT_LOWER_LIMIT) {
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100232 mmio_clrbits_32(base + GPIO_AFRL_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200233 ((uint32_t)GPIO_ALTERNATE_MASK << (pin << 2)));
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100234 mmio_setbits_32(base + GPIO_AFRL_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200235 alternate << (pin << 2));
236 } else {
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100237 mmio_clrbits_32(base + GPIO_AFRH_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200238 ((uint32_t)GPIO_ALTERNATE_MASK <<
239 ((pin - GPIO_ALT_LOWER_LIMIT) << 2)));
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100240 mmio_setbits_32(base + GPIO_AFRH_OFFSET,
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200241 alternate << ((pin - GPIO_ALT_LOWER_LIMIT) <<
242 2));
243 }
244
245 VERBOSE("GPIO %u mode set to 0x%x\n", bank,
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100246 mmio_read_32(base + GPIO_MODE_OFFSET));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200247 VERBOSE("GPIO %u speed set to 0x%x\n", bank,
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100248 mmio_read_32(base + GPIO_SPEED_OFFSET));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200249 VERBOSE("GPIO %u mode pull to 0x%x\n", bank,
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100250 mmio_read_32(base + GPIO_PUPD_OFFSET));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200251 VERBOSE("GPIO %u mode alternate low to 0x%x\n", bank,
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100252 mmio_read_32(base + GPIO_AFRL_OFFSET));
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200253 VERBOSE("GPIO %u mode alternate high to 0x%x\n", bank,
Yann Gautier1a3fc9f2019-01-17 14:35:22 +0100254 mmio_read_32(base + GPIO_AFRH_OFFSET));
Yann Gautier038bff22019-01-17 19:17:47 +0100255
Yann Gautiera2e2a302019-02-14 11:13:39 +0100256 stm32mp_clk_disable(clock);
Etienne Carriere30189212019-12-02 10:11:32 +0100257
258 if (status == DT_SECURE) {
259 stm32mp_register_secure_gpio(bank, pin);
260 set_gpio_secure_cfg(bank, pin, true);
261
262 } else {
263 stm32mp_register_non_secure_gpio(bank, pin);
264 set_gpio_secure_cfg(bank, pin, false);
265 }
Yann Gautier038bff22019-01-17 19:17:47 +0100266}
267
268void set_gpio_secure_cfg(uint32_t bank, uint32_t pin, bool secure)
269{
270 uintptr_t base = stm32_get_gpio_bank_base(bank);
Yann Gautieree8f5422019-02-14 11:13:25 +0100271 unsigned long clock = stm32_get_gpio_bank_clock(bank);
Yann Gautier038bff22019-01-17 19:17:47 +0100272
273 assert(pin <= GPIO_PIN_MAX);
274
Yann Gautiera2e2a302019-02-14 11:13:39 +0100275 stm32mp_clk_enable(clock);
Yann Gautier038bff22019-01-17 19:17:47 +0100276
277 if (secure) {
278 mmio_setbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
279 } else {
280 mmio_clrbits_32(base + GPIO_SECR_OFFSET, BIT(pin));
281 }
282
Yann Gautiera2e2a302019-02-14 11:13:39 +0100283 stm32mp_clk_disable(clock);
Yann Gautierd0ca7f42018-07-13 21:33:09 +0200284}