| /* |
| * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <assert.h> |
| #include <debug.h> |
| #include <libfdt.h> |
| #include <platform_def.h> |
| #include <stm32mp1_clk.h> |
| #include <stm32mp1_clkfunc.h> |
| #include <stm32mp1_dt.h> |
| |
| #define DT_GPIO_BANK_SHIFT 12 |
| #define DT_GPIO_BANK_MASK 0x1F000U |
| #define DT_GPIO_PIN_SHIFT 8 |
| #define DT_GPIO_PIN_MASK 0xF00U |
| #define DT_GPIO_MODE_MASK 0xFFU |
| |
| static int fdt_checked; |
| |
| static void *fdt = (void *)(uintptr_t)STM32MP1_DTB_BASE; |
| |
| /******************************************************************************* |
| * This function checks device tree file with its header. |
| * Returns 0 if success, and a negative value else. |
| ******************************************************************************/ |
| int dt_open_and_check(void) |
| { |
| int ret = fdt_check_header(fdt); |
| |
| if (ret == 0) { |
| fdt_checked = 1; |
| } |
| |
| return ret; |
| } |
| |
| /******************************************************************************* |
| * This function gets the address of the DT. |
| * If DT is OK, fdt_addr is filled with DT address. |
| * Returns 1 if success, 0 otherwise. |
| ******************************************************************************/ |
| int fdt_get_address(void **fdt_addr) |
| { |
| if (fdt_checked == 1) { |
| *fdt_addr = fdt; |
| } |
| |
| return fdt_checked; |
| } |
| |
| /******************************************************************************* |
| * This function check the presence of a node (generic use of fdt library). |
| * Returns true if present, false else. |
| ******************************************************************************/ |
| bool fdt_check_node(int node) |
| { |
| int len; |
| const char *cchar; |
| |
| cchar = fdt_get_name(fdt, node, &len); |
| |
| return (cchar != NULL) && (len >= 0); |
| } |
| |
| /******************************************************************************* |
| * This function check the status of a node (generic use of fdt library). |
| * Returns true if "okay" or missing, false else. |
| ******************************************************************************/ |
| bool fdt_check_status(int node) |
| { |
| int len; |
| const char *cchar; |
| |
| cchar = fdt_getprop(fdt, node, "status", &len); |
| if (cchar == NULL) { |
| return true; |
| } |
| |
| return strncmp(cchar, "okay", (size_t)len) == 0; |
| } |
| |
| /******************************************************************************* |
| * This function check the secure-status of a node (generic use of fdt library). |
| * Returns true if "okay" or missing, false else. |
| ******************************************************************************/ |
| bool fdt_check_secure_status(int node) |
| { |
| int len; |
| const char *cchar; |
| |
| cchar = fdt_getprop(fdt, node, "secure-status", &len); |
| if (cchar == NULL) { |
| return true; |
| } |
| |
| return strncmp(cchar, "okay", (size_t)len) == 0; |
| } |
| |
| /******************************************************************************* |
| * This function reads a value of a node property (generic use of fdt |
| * library). |
| * Returns value if success, and a default value if property not found. |
| * Default value is passed as parameter. |
| ******************************************************************************/ |
| uint32_t fdt_read_uint32_default(int node, const char *prop_name, |
| uint32_t dflt_value) |
| { |
| const fdt32_t *cuint; |
| int lenp; |
| |
| cuint = fdt_getprop(fdt, node, prop_name, &lenp); |
| if (cuint == NULL) { |
| return dflt_value; |
| } |
| |
| return fdt32_to_cpu(*cuint); |
| } |
| |
| /******************************************************************************* |
| * This function reads a series of parameters in a node property |
| * (generic use of fdt library). |
| * It reads the values inside the device tree, from property name and node. |
| * The number of parameters is also indicated as entry parameter. |
| * Returns 0 if success, and a negative value else. |
| * If success, values are stored at the third parameter address. |
| ******************************************************************************/ |
| int fdt_read_uint32_array(int node, const char *prop_name, uint32_t *array, |
| uint32_t count) |
| { |
| const fdt32_t *cuint; |
| int len; |
| uint32_t i; |
| |
| cuint = fdt_getprop(fdt, node, prop_name, &len); |
| if (cuint == NULL) { |
| return -FDT_ERR_NOTFOUND; |
| } |
| |
| if ((uint32_t)len != (count * sizeof(uint32_t))) { |
| return -FDT_ERR_BADLAYOUT; |
| } |
| |
| for (i = 0; i < ((uint32_t)len / sizeof(uint32_t)); i++) { |
| *array = fdt32_to_cpu(*cuint); |
| array++; |
| cuint++; |
| } |
| |
| return 0; |
| } |