1 /* 2 * Copyright (c) 2017-2020, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <errno.h> 9 10 #include <libfdt.h> 11 12 #include <platform_def.h> 13 14 #include <common/debug.h> 15 #include <common/fdt_wrappers.h> 16 #include <drivers/st/stm32_gpio.h> 17 #include <drivers/st/stm32mp1_ddr.h> 18 #include <drivers/st/stm32mp1_ram.h> 19 20 #include <stm32mp_dt.h> 21 22 static int fdt_checked; 23 24 static void *fdt = (void *)(uintptr_t)STM32MP_DTB_BASE; 25 26 /******************************************************************************* 27 * This function checks device tree file with its header. 28 * Returns 0 on success and a negative FDT error code on failure. 29 ******************************************************************************/ 30 int dt_open_and_check(void) 31 { 32 int ret = fdt_check_header(fdt); 33 34 if (ret == 0) { 35 fdt_checked = 1; 36 } 37 38 return ret; 39 } 40 41 /******************************************************************************* 42 * This function gets the address of the DT. 43 * If DT is OK, fdt_addr is filled with DT address. 44 * Returns 1 if success, 0 otherwise. 45 ******************************************************************************/ 46 int fdt_get_address(void **fdt_addr) 47 { 48 if (fdt_checked == 1) { 49 *fdt_addr = fdt; 50 } 51 52 return fdt_checked; 53 } 54 55 /******************************************************************************* 56 * This function check the presence of a node (generic use of fdt library). 57 * Returns true if present, else return false. 58 ******************************************************************************/ 59 bool fdt_check_node(int node) 60 { 61 int len; 62 const char *cchar; 63 64 cchar = fdt_get_name(fdt, node, &len); 65 66 return (cchar != NULL) && (len >= 0); 67 } 68 69 /******************************************************************************* 70 * This function return global node status (generic use of fdt library). 71 ******************************************************************************/ 72 uint8_t fdt_get_status(int node) 73 { 74 uint8_t status = DT_DISABLED; 75 int len; 76 const char *cchar; 77 78 cchar = fdt_getprop(fdt, node, "status", &len); 79 if ((cchar == NULL) || 80 (strncmp(cchar, "okay", (size_t)len) == 0)) { 81 status |= DT_NON_SECURE; 82 } 83 84 cchar = fdt_getprop(fdt, node, "secure-status", &len); 85 if (cchar == NULL) { 86 if (status == DT_NON_SECURE) { 87 status |= DT_SECURE; 88 } 89 } else if (strncmp(cchar, "okay", (size_t)len) == 0) { 90 status |= DT_SECURE; 91 } 92 93 return status; 94 } 95 96 #if ENABLE_ASSERTIONS 97 /******************************************************************************* 98 * This function returns the address cells from the node parent. 99 * Returns: 100 * - #address-cells value if success. 101 * - invalid value if error. 102 * - a default value if undefined #address-cells property as per libfdt 103 * implementation. 104 ******************************************************************************/ 105 static int fdt_get_node_parent_address_cells(int node) 106 { 107 int parent; 108 109 parent = fdt_parent_offset(fdt, node); 110 if (parent < 0) { 111 return -FDT_ERR_NOTFOUND; 112 } 113 114 return fdt_address_cells(fdt, parent); 115 } 116 #endif 117 118 /******************************************************************************* 119 * This function gets the stdout pin configuration information from the DT. 120 * And then calls the sub-function to treat it and set GPIO registers. 121 * Returns 0 on success and a negative FDT error code on failure. 122 ******************************************************************************/ 123 int dt_set_stdout_pinctrl(void) 124 { 125 int node; 126 127 node = fdt_get_stdout_node_offset(fdt); 128 if (node < 0) { 129 return -FDT_ERR_NOTFOUND; 130 } 131 132 return dt_set_pinctrl_config(node); 133 } 134 135 /******************************************************************************* 136 * This function fills the generic information from a given node. 137 ******************************************************************************/ 138 void dt_fill_device_info(struct dt_node_info *info, int node) 139 { 140 const fdt32_t *cuint; 141 142 assert(fdt_get_node_parent_address_cells(node) == 1); 143 144 cuint = fdt_getprop(fdt, node, "reg", NULL); 145 if (cuint != NULL) { 146 info->base = fdt32_to_cpu(*cuint); 147 } else { 148 info->base = 0; 149 } 150 151 cuint = fdt_getprop(fdt, node, "clocks", NULL); 152 if (cuint != NULL) { 153 cuint++; 154 info->clock = (int)fdt32_to_cpu(*cuint); 155 } else { 156 info->clock = -1; 157 } 158 159 cuint = fdt_getprop(fdt, node, "resets", NULL); 160 if (cuint != NULL) { 161 cuint++; 162 info->reset = (int)fdt32_to_cpu(*cuint); 163 } else { 164 info->reset = -1; 165 } 166 167 info->status = fdt_get_status(node); 168 } 169 170 /******************************************************************************* 171 * This function retrieve the generic information from DT. 172 * Returns node on success and a negative FDT error code on failure. 173 ******************************************************************************/ 174 int dt_get_node(struct dt_node_info *info, int offset, const char *compat) 175 { 176 int node; 177 178 node = fdt_node_offset_by_compatible(fdt, offset, compat); 179 if (node < 0) { 180 return -FDT_ERR_NOTFOUND; 181 } 182 183 dt_fill_device_info(info, node); 184 185 return node; 186 } 187 188 /******************************************************************************* 189 * This function gets the UART instance info of stdout from the DT. 190 * Returns node on success and a negative FDT error code on failure. 191 ******************************************************************************/ 192 int dt_get_stdout_uart_info(struct dt_node_info *info) 193 { 194 int node; 195 196 node = fdt_get_stdout_node_offset(fdt); 197 if (node < 0) { 198 return -FDT_ERR_NOTFOUND; 199 } 200 201 dt_fill_device_info(info, node); 202 203 return node; 204 } 205 206 /******************************************************************************* 207 * This function gets DDR size information from the DT. 208 * Returns value in bytes on success, and 0 on failure. 209 ******************************************************************************/ 210 uint32_t dt_get_ddr_size(void) 211 { 212 int node; 213 214 node = fdt_node_offset_by_compatible(fdt, -1, DT_DDR_COMPAT); 215 if (node < 0) { 216 INFO("%s: Cannot read DDR node in DT\n", __func__); 217 return 0; 218 } 219 220 return fdt_read_uint32_default(fdt, node, "st,mem-size", 0); 221 } 222 223 /******************************************************************************* 224 * This function gets PWR VDD regulator voltage information from the DT. 225 * Returns value in microvolts on success, and 0 on failure. 226 ******************************************************************************/ 227 uint32_t dt_get_pwr_vdd_voltage(void) 228 { 229 int node, pwr_regulators_node; 230 const fdt32_t *cuint; 231 232 node = fdt_node_offset_by_compatible(fdt, -1, DT_PWR_COMPAT); 233 if (node < 0) { 234 INFO("%s: Cannot read PWR node in DT\n", __func__); 235 return 0; 236 } 237 238 pwr_regulators_node = fdt_subnode_offset(fdt, node, "pwr-regulators"); 239 if (pwr_regulators_node < 0) { 240 INFO("%s: Cannot read pwr-regulators node in DT\n", __func__); 241 return 0; 242 } 243 244 cuint = fdt_getprop(fdt, pwr_regulators_node, "vdd-supply", NULL); 245 if (cuint == NULL) { 246 return 0; 247 } 248 249 node = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*cuint)); 250 if (node < 0) { 251 return 0; 252 } 253 254 cuint = fdt_getprop(fdt, node, "regulator-min-microvolt", NULL); 255 if (cuint == NULL) { 256 return 0; 257 } 258 259 return fdt32_to_cpu(*cuint); 260 } 261 262 /******************************************************************************* 263 * This function retrieves board model from DT 264 * Returns string taken from model node, NULL otherwise 265 ******************************************************************************/ 266 const char *dt_get_board_model(void) 267 { 268 int node = fdt_path_offset(fdt, "/"); 269 270 if (node < 0) { 271 return NULL; 272 } 273 274 return (const char *)fdt_getprop(fdt, node, "model", NULL); 275 } 276 277 /******************************************************************************* 278 * This function gets the pin count for a GPIO bank based from the FDT. 279 * It also checks node consistency. 280 ******************************************************************************/ 281 int fdt_get_gpio_bank_pin_count(unsigned int bank) 282 { 283 int pinctrl_node; 284 int node; 285 uint32_t bank_offset; 286 287 pinctrl_node = stm32_get_gpio_bank_pinctrl_node(fdt, bank); 288 if (pinctrl_node < 0) { 289 return -FDT_ERR_NOTFOUND; 290 } 291 292 bank_offset = stm32_get_gpio_bank_offset(bank); 293 294 fdt_for_each_subnode(node, fdt, pinctrl_node) { 295 const fdt32_t *cuint; 296 297 if (fdt_getprop(fdt, node, "gpio-controller", NULL) == NULL) { 298 continue; 299 } 300 301 cuint = fdt_getprop(fdt, node, "reg", NULL); 302 if (cuint == NULL) { 303 continue; 304 } 305 306 if (fdt32_to_cpu(*cuint) != bank_offset) { 307 continue; 308 } 309 310 if (fdt_get_status(node) == DT_DISABLED) { 311 return 0; 312 } 313 314 cuint = fdt_getprop(fdt, node, "ngpios", NULL); 315 if (cuint == NULL) { 316 return -FDT_ERR_NOTFOUND; 317 } 318 319 return (int)fdt32_to_cpu(*cuint); 320 } 321 322 return 0; 323 } 324