Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 1 | /* |
Yann Gautier | 1a3fc9f | 2019-01-17 14:35:22 +0100 | [diff] [blame] | 2 | * Copyright (c) 2017-2019, STMicroelectronics - All Rights Reserved |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 7 | #include <errno.h> |
Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 8 | |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 9 | #include <libfdt.h> |
Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 10 | |
Yann Gautier | 57e282b | 2019-01-07 11:17:24 +0100 | [diff] [blame] | 11 | #include <platform_def.h> |
| 12 | |
Antonio Nino Diaz | e0f9063 | 2018-12-14 00:18:21 +0000 | [diff] [blame] | 13 | #include <drivers/st/stm32mp1_clk.h> |
| 14 | #include <drivers/st/stm32mp1_clkfunc.h> |
| 15 | #include <dt-bindings/clock/stm32mp1-clksrc.h> |
| 16 | |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 17 | #define DT_RCC_NODE_NAME "rcc@50000000" |
| 18 | #define DT_RCC_CLK_COMPAT "st,stm32mp1-rcc" |
| 19 | #define DT_RCC_COMPAT "syscon" |
| 20 | #define DT_STGEN_COMPAT "st,stm32-stgen" |
| 21 | #define DT_UART_COMPAT "st,stm32h7-uart" |
| 22 | #define DT_USART_COMPAT "st,stm32h7-usart" |
| 23 | |
| 24 | const char *stm32mp_osc_node_label[NB_OSC] = { |
| 25 | [_LSI] = "clk-lsi", |
| 26 | [_LSE] = "clk-lse", |
| 27 | [_HSI] = "clk-hsi", |
| 28 | [_HSE] = "clk-hse", |
| 29 | [_CSI] = "clk-csi", |
| 30 | [_I2S_CKIN] = "i2s_ckin", |
| 31 | [_USB_PHY_48] = "ck_usbo_48m" |
| 32 | }; |
| 33 | |
| 34 | /******************************************************************************* |
| 35 | * This function reads the frequency of an oscillator from its name. |
| 36 | * It reads the value indicated inside the device tree. |
Yann Gautier | 1a3fc9f | 2019-01-17 14:35:22 +0100 | [diff] [blame] | 37 | * Returns 0 on success, and a negative FDT/ERRNO error code on failure. |
| 38 | * On success, value is stored in the second parameter. |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 39 | ******************************************************************************/ |
| 40 | int fdt_osc_read_freq(const char *name, uint32_t *freq) |
| 41 | { |
| 42 | int node, subnode; |
| 43 | void *fdt; |
| 44 | |
| 45 | if (fdt_get_address(&fdt) == 0) { |
| 46 | return -ENOENT; |
| 47 | } |
| 48 | |
| 49 | node = fdt_path_offset(fdt, "/clocks"); |
| 50 | if (node < 0) { |
| 51 | return -FDT_ERR_NOTFOUND; |
| 52 | } |
| 53 | |
| 54 | fdt_for_each_subnode(subnode, fdt, node) { |
| 55 | const char *cchar; |
| 56 | int ret; |
| 57 | |
| 58 | cchar = fdt_get_name(fdt, subnode, &ret); |
| 59 | if (cchar == NULL) { |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | if (strncmp(cchar, name, (size_t)ret) == 0) { |
| 64 | const fdt32_t *cuint; |
| 65 | |
| 66 | cuint = fdt_getprop(fdt, subnode, "clock-frequency", |
| 67 | &ret); |
| 68 | if (cuint == NULL) { |
| 69 | return ret; |
| 70 | } |
| 71 | |
| 72 | *freq = fdt32_to_cpu(*cuint); |
| 73 | |
| 74 | return 0; |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /* Oscillator not found, freq=0 */ |
| 79 | *freq = 0; |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | /******************************************************************************* |
| 84 | * This function checks the presence of an oscillator property from its id. |
| 85 | * The search is done inside the device tree. |
| 86 | * Returns true/false regarding search result. |
| 87 | ******************************************************************************/ |
| 88 | bool fdt_osc_read_bool(enum stm32mp_osc_id osc_id, const char *prop_name) |
| 89 | { |
| 90 | int node, subnode; |
| 91 | void *fdt; |
| 92 | |
| 93 | if (fdt_get_address(&fdt) == 0) { |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | if (osc_id >= NB_OSC) { |
| 98 | return false; |
| 99 | } |
| 100 | |
| 101 | node = fdt_path_offset(fdt, "/clocks"); |
| 102 | if (node < 0) { |
| 103 | return false; |
| 104 | } |
| 105 | |
| 106 | fdt_for_each_subnode(subnode, fdt, node) { |
| 107 | const char *cchar; |
| 108 | int ret; |
| 109 | |
| 110 | cchar = fdt_get_name(fdt, subnode, &ret); |
| 111 | if (cchar == NULL) { |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | if (strncmp(cchar, stm32mp_osc_node_label[osc_id], |
| 116 | (size_t)ret) != 0) { |
| 117 | continue; |
| 118 | } |
| 119 | |
| 120 | if (fdt_getprop(fdt, subnode, prop_name, NULL) != NULL) { |
| 121 | return true; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | return false; |
| 126 | } |
| 127 | |
| 128 | /******************************************************************************* |
| 129 | * This function reads a value of a oscillator property from its id. |
Yann Gautier | 1a3fc9f | 2019-01-17 14:35:22 +0100 | [diff] [blame] | 130 | * Returns value on success, and a default value if property not found. |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 131 | * Default value is passed as parameter. |
| 132 | ******************************************************************************/ |
| 133 | uint32_t fdt_osc_read_uint32_default(enum stm32mp_osc_id osc_id, |
| 134 | const char *prop_name, uint32_t dflt_value) |
| 135 | { |
| 136 | int node, subnode; |
| 137 | void *fdt; |
| 138 | |
| 139 | if (fdt_get_address(&fdt) == 0) { |
| 140 | return dflt_value; |
| 141 | } |
| 142 | |
| 143 | if (osc_id >= NB_OSC) { |
| 144 | return dflt_value; |
| 145 | } |
| 146 | |
| 147 | node = fdt_path_offset(fdt, "/clocks"); |
| 148 | if (node < 0) { |
| 149 | return dflt_value; |
| 150 | } |
| 151 | |
| 152 | fdt_for_each_subnode(subnode, fdt, node) { |
| 153 | const char *cchar; |
| 154 | int ret; |
| 155 | |
| 156 | cchar = fdt_get_name(fdt, subnode, &ret); |
| 157 | if (cchar == NULL) { |
| 158 | return dflt_value; |
| 159 | } |
| 160 | |
| 161 | if (strncmp(cchar, stm32mp_osc_node_label[osc_id], |
| 162 | (size_t)ret) != 0) { |
| 163 | continue; |
| 164 | } |
| 165 | |
| 166 | return fdt_read_uint32_default(subnode, prop_name, dflt_value); |
| 167 | } |
| 168 | |
| 169 | return dflt_value; |
| 170 | } |
| 171 | |
| 172 | /******************************************************************************* |
| 173 | * This function reads the rcc base address. |
| 174 | * It reads the value indicated inside the device tree. |
| 175 | * Returns address if success, and 0 value else. |
| 176 | ******************************************************************************/ |
| 177 | uint32_t fdt_rcc_read_addr(void) |
| 178 | { |
| 179 | int node, subnode; |
| 180 | void *fdt; |
| 181 | |
| 182 | if (fdt_get_address(&fdt) == 0) { |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | node = fdt_path_offset(fdt, "/soc"); |
| 187 | if (node < 0) { |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | fdt_for_each_subnode(subnode, fdt, node) { |
| 192 | const char *cchar; |
| 193 | int ret; |
| 194 | |
| 195 | cchar = fdt_get_name(fdt, subnode, &ret); |
| 196 | if (cchar == NULL) { |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | if (strncmp(cchar, DT_RCC_NODE_NAME, (size_t)ret) == 0) { |
| 201 | const fdt32_t *cuint; |
| 202 | |
| 203 | cuint = fdt_getprop(fdt, subnode, "reg", NULL); |
| 204 | if (cuint == NULL) { |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | return fdt32_to_cpu(*cuint); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /******************************************************************************* |
| 216 | * This function reads a series of parameters in rcc-clk section. |
| 217 | * It reads the values indicated inside the device tree, from property name. |
| 218 | * The number of parameters is also indicated as entry parameter. |
| 219 | * Returns 0 if success, and a negative value else. |
| 220 | * If success, values are stored at the second parameter address. |
| 221 | ******************************************************************************/ |
| 222 | int fdt_rcc_read_uint32_array(const char *prop_name, |
| 223 | uint32_t *array, uint32_t count) |
| 224 | { |
| 225 | int node; |
| 226 | void *fdt; |
| 227 | |
| 228 | if (fdt_get_address(&fdt) == 0) { |
| 229 | return -ENOENT; |
| 230 | } |
| 231 | |
| 232 | node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT); |
| 233 | if (node < 0) { |
| 234 | return -FDT_ERR_NOTFOUND; |
| 235 | } |
| 236 | |
| 237 | return fdt_read_uint32_array(node, prop_name, array, count); |
| 238 | } |
| 239 | |
| 240 | /******************************************************************************* |
| 241 | * This function gets the subnode offset in rcc-clk section from its name. |
| 242 | * It reads the values indicated inside the device tree. |
| 243 | * Returns offset if success, and a negative value else. |
| 244 | ******************************************************************************/ |
| 245 | int fdt_rcc_subnode_offset(const char *name) |
| 246 | { |
| 247 | int node, subnode; |
| 248 | void *fdt; |
| 249 | |
| 250 | if (fdt_get_address(&fdt) == 0) { |
| 251 | return -ENOENT; |
| 252 | } |
| 253 | |
| 254 | node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT); |
| 255 | if (node < 0) { |
| 256 | return -FDT_ERR_NOTFOUND; |
| 257 | } |
| 258 | |
| 259 | subnode = fdt_subnode_offset(fdt, node, name); |
| 260 | if (subnode <= 0) { |
| 261 | return -FDT_ERR_NOTFOUND; |
| 262 | } |
| 263 | |
| 264 | return subnode; |
| 265 | } |
| 266 | |
| 267 | /******************************************************************************* |
| 268 | * This function gets the pointer to a rcc-clk property from its name. |
| 269 | * It reads the values indicated inside the device tree. |
| 270 | * Length of the property is stored in the second parameter. |
Yann Gautier | f9af3bc | 2018-11-09 15:57:18 +0100 | [diff] [blame] | 271 | * Returns pointer on success, and NULL value on failure. |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 272 | ******************************************************************************/ |
Yann Gautier | f9af3bc | 2018-11-09 15:57:18 +0100 | [diff] [blame] | 273 | const fdt32_t *fdt_rcc_read_prop(const char *prop_name, int *lenp) |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 274 | { |
Yann Gautier | f9af3bc | 2018-11-09 15:57:18 +0100 | [diff] [blame] | 275 | const fdt32_t *cuint; |
Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame] | 276 | int node, len; |
| 277 | void *fdt; |
| 278 | |
| 279 | if (fdt_get_address(&fdt) == 0) { |
| 280 | return NULL; |
| 281 | } |
| 282 | |
| 283 | node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_CLK_COMPAT); |
| 284 | if (node < 0) { |
| 285 | return NULL; |
| 286 | } |
| 287 | |
| 288 | cuint = fdt_getprop(fdt, node, prop_name, &len); |
| 289 | if (cuint == NULL) { |
| 290 | return NULL; |
| 291 | } |
| 292 | |
| 293 | *lenp = len; |
| 294 | return cuint; |
| 295 | } |
| 296 | |
| 297 | /******************************************************************************* |
| 298 | * This function gets the secure status for rcc node. |
| 299 | * It reads secure-status in device tree. |
| 300 | * Returns 1 if rcc is available from secure world, 0 else. |
| 301 | ******************************************************************************/ |
| 302 | bool fdt_get_rcc_secure_status(void) |
| 303 | { |
| 304 | int node; |
| 305 | void *fdt; |
| 306 | |
| 307 | if (fdt_get_address(&fdt) == 0) { |
| 308 | return false; |
| 309 | } |
| 310 | |
| 311 | node = fdt_node_offset_by_compatible(fdt, -1, DT_RCC_COMPAT); |
| 312 | if (node < 0) { |
| 313 | return false; |
| 314 | } |
| 315 | |
| 316 | return fdt_check_secure_status(node); |
| 317 | } |
| 318 | |
| 319 | /******************************************************************************* |
| 320 | * This function reads the stgen base address. |
| 321 | * It reads the value indicated inside the device tree. |
| 322 | * Returns address if success, and NULL value else. |
| 323 | ******************************************************************************/ |
| 324 | uintptr_t fdt_get_stgen_base(void) |
| 325 | { |
| 326 | int node; |
| 327 | const fdt32_t *cuint; |
| 328 | void *fdt; |
| 329 | |
| 330 | if (fdt_get_address(&fdt) == 0) { |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | node = fdt_node_offset_by_compatible(fdt, -1, DT_STGEN_COMPAT); |
| 335 | if (node < 0) { |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | cuint = fdt_getprop(fdt, node, "reg", NULL); |
| 340 | if (cuint == NULL) { |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | return fdt32_to_cpu(*cuint); |
| 345 | } |
| 346 | |
| 347 | /******************************************************************************* |
| 348 | * This function gets the clock ID of the given node. |
| 349 | * It reads the value indicated inside the device tree. |
| 350 | * Returns ID if success, and a negative value else. |
| 351 | ******************************************************************************/ |
| 352 | int fdt_get_clock_id(int node) |
| 353 | { |
| 354 | const fdt32_t *cuint; |
| 355 | void *fdt; |
| 356 | |
| 357 | if (fdt_get_address(&fdt) == 0) { |
| 358 | return -ENOENT; |
| 359 | } |
| 360 | |
| 361 | cuint = fdt_getprop(fdt, node, "clocks", NULL); |
| 362 | if (cuint == NULL) { |
| 363 | return -FDT_ERR_NOTFOUND; |
| 364 | } |
| 365 | |
| 366 | cuint++; |
| 367 | return (int)fdt32_to_cpu(*cuint); |
| 368 | } |