Yann Gautier | 9aea69e | 2018-07-24 17:13:36 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <assert.h> |
| 8 | #include <debug.h> |
| 9 | #include <libfdt.h> |
| 10 | #include <platform_def.h> |
| 11 | #include <stm32mp1_clk.h> |
| 12 | #include <stm32mp1_clkfunc.h> |
| 13 | #include <stm32mp1_dt.h> |
| 14 | |
| 15 | #define DT_GPIO_BANK_SHIFT 12 |
| 16 | #define DT_GPIO_BANK_MASK 0x1F000U |
| 17 | #define DT_GPIO_PIN_SHIFT 8 |
| 18 | #define DT_GPIO_PIN_MASK 0xF00U |
| 19 | #define DT_GPIO_MODE_MASK 0xFFU |
| 20 | |
| 21 | static int fdt_checked; |
| 22 | |
| 23 | static void *fdt = (void *)(uintptr_t)STM32MP1_DTB_BASE; |
| 24 | |
| 25 | /******************************************************************************* |
| 26 | * This function checks device tree file with its header. |
| 27 | * Returns 0 if success, and a negative value else. |
| 28 | ******************************************************************************/ |
| 29 | int dt_open_and_check(void) |
| 30 | { |
| 31 | int ret = fdt_check_header(fdt); |
| 32 | |
| 33 | if (ret == 0) { |
| 34 | fdt_checked = 1; |
| 35 | } |
| 36 | |
| 37 | return ret; |
| 38 | } |
| 39 | |
| 40 | /******************************************************************************* |
| 41 | * This function gets the address of the DT. |
| 42 | * If DT is OK, fdt_addr is filled with DT address. |
| 43 | * Returns 1 if success, 0 otherwise. |
| 44 | ******************************************************************************/ |
| 45 | int fdt_get_address(void **fdt_addr) |
| 46 | { |
| 47 | if (fdt_checked == 1) { |
| 48 | *fdt_addr = fdt; |
| 49 | } |
| 50 | |
| 51 | return fdt_checked; |
| 52 | } |
| 53 | |
| 54 | /******************************************************************************* |
| 55 | * This function check the presence of a node (generic use of fdt library). |
| 56 | * Returns true if present, false else. |
| 57 | ******************************************************************************/ |
| 58 | bool fdt_check_node(int node) |
| 59 | { |
| 60 | int len; |
| 61 | const char *cchar; |
| 62 | |
| 63 | cchar = fdt_get_name(fdt, node, &len); |
| 64 | |
| 65 | return (cchar != NULL) && (len >= 0); |
| 66 | } |
| 67 | |
| 68 | /******************************************************************************* |
| 69 | * This function check the status of a node (generic use of fdt library). |
| 70 | * Returns true if "okay" or missing, false else. |
| 71 | ******************************************************************************/ |
| 72 | bool fdt_check_status(int node) |
| 73 | { |
| 74 | int len; |
| 75 | const char *cchar; |
| 76 | |
| 77 | cchar = fdt_getprop(fdt, node, "status", &len); |
| 78 | if (cchar == NULL) { |
| 79 | return true; |
| 80 | } |
| 81 | |
| 82 | return strncmp(cchar, "okay", (size_t)len) == 0; |
| 83 | } |
| 84 | |
| 85 | /******************************************************************************* |
| 86 | * This function check the secure-status of a node (generic use of fdt library). |
| 87 | * Returns true if "okay" or missing, false else. |
| 88 | ******************************************************************************/ |
| 89 | bool fdt_check_secure_status(int node) |
| 90 | { |
| 91 | int len; |
| 92 | const char *cchar; |
| 93 | |
| 94 | cchar = fdt_getprop(fdt, node, "secure-status", &len); |
| 95 | if (cchar == NULL) { |
| 96 | return true; |
| 97 | } |
| 98 | |
| 99 | return strncmp(cchar, "okay", (size_t)len) == 0; |
| 100 | } |
| 101 | |
| 102 | /******************************************************************************* |
| 103 | * This function reads a value of a node property (generic use of fdt |
| 104 | * library). |
| 105 | * Returns value if success, and a default value if property not found. |
| 106 | * Default value is passed as parameter. |
| 107 | ******************************************************************************/ |
| 108 | uint32_t fdt_read_uint32_default(int node, const char *prop_name, |
| 109 | uint32_t dflt_value) |
| 110 | { |
| 111 | const fdt32_t *cuint; |
| 112 | int lenp; |
| 113 | |
| 114 | cuint = fdt_getprop(fdt, node, prop_name, &lenp); |
| 115 | if (cuint == NULL) { |
| 116 | return dflt_value; |
| 117 | } |
| 118 | |
| 119 | return fdt32_to_cpu(*cuint); |
| 120 | } |
| 121 | |
| 122 | /******************************************************************************* |
| 123 | * This function reads a series of parameters in a node property |
| 124 | * (generic use of fdt library). |
| 125 | * It reads the values inside the device tree, from property name and node. |
| 126 | * The number of parameters is also indicated as entry parameter. |
| 127 | * Returns 0 if success, and a negative value else. |
| 128 | * If success, values are stored at the third parameter address. |
| 129 | ******************************************************************************/ |
| 130 | int fdt_read_uint32_array(int node, const char *prop_name, uint32_t *array, |
| 131 | uint32_t count) |
| 132 | { |
| 133 | const fdt32_t *cuint; |
| 134 | int len; |
| 135 | uint32_t i; |
| 136 | |
| 137 | cuint = fdt_getprop(fdt, node, prop_name, &len); |
| 138 | if (cuint == NULL) { |
| 139 | return -FDT_ERR_NOTFOUND; |
| 140 | } |
| 141 | |
| 142 | if ((uint32_t)len != (count * sizeof(uint32_t))) { |
| 143 | return -FDT_ERR_BADLAYOUT; |
| 144 | } |
| 145 | |
| 146 | for (i = 0; i < ((uint32_t)len / sizeof(uint32_t)); i++) { |
| 147 | *array = fdt32_to_cpu(*cuint); |
| 148 | array++; |
| 149 | cuint++; |
| 150 | } |
| 151 | |
| 152 | return 0; |
| 153 | } |