1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * Copyright (c) 2016-2021, Linaro Limited 4 */ 5 6 #ifndef KERNEL_DT_H 7 #define KERNEL_DT_H 8 9 #include <compiler.h> 10 #include <kernel/interrupt.h> 11 #include <kernel/panic.h> 12 #include <scattered_array.h> 13 #include <stdint.h> 14 #include <tee_api_types.h> 15 #include <types_ext.h> 16 #include <util.h> 17 18 /* 19 * Bitfield to reflect status and secure-status values ("okay", "disabled" 20 * or not present) 21 */ 22 #define DT_STATUS_DISABLED U(0) 23 #define DT_STATUS_OK_NSEC BIT(0) 24 #define DT_STATUS_OK_SEC BIT(1) 25 26 #define DT_INFO_INVALID_REG ((paddr_t)-1) 27 #define DT_INFO_INVALID_REG_SIZE ((size_t)-1) 28 #define DT_INFO_INVALID_CLOCK -1 29 #define DT_INFO_INVALID_RESET -1 30 #define DT_INFO_INVALID_INTERRUPT -1 31 32 /* 33 * @status: Bit mask for DT_STATUS_* 34 * @reg: Device register physical base address or DT_INFO_INVALID_REG 35 * @reg_size: Device register size or DT_INFO_INVALID_REG_SIZE 36 * @clock: Device identifier (positive value) or DT_INFO_INVALID_CLOCK 37 * @reset: Device reset identifier (positive value) or DT_INFO_INVALID_CLOCK 38 * @interrupt: Device interrupt identifier (positive value) or 39 * DT_INFO_INVALID_INTERRUPT 40 * @type: IRQ_TYPE_* value parsed from interrupts properties or IRQ_TYPE_NONE if 41 * not present 42 * @prio: interrupt priority parsed from interrupts properties or 0 if not 43 * present 44 */ 45 struct dt_node_info { 46 unsigned int status; 47 paddr_t reg; 48 size_t reg_size; 49 int clock; 50 int reset; 51 int interrupt; 52 uint32_t type; 53 uint32_t prio; 54 }; 55 56 /* 57 * DT-aware drivers 58 */ 59 60 struct dt_device_match { 61 const char *compatible; 62 const void *compat_data; 63 }; 64 65 enum dt_driver_type { 66 DT_DRIVER_NOTYPE, 67 DT_DRIVER_UART, 68 DT_DRIVER_CLK, 69 DT_DRIVER_RSTCTRL, 70 }; 71 72 /* 73 * dt_driver_probe_func - Callback probe function for a driver. 74 * 75 * @fdt: FDT base address 76 * @nodeoffset: Offset of the node in the FDT 77 * @compat_data: Data registered for the compatible that probed the device 78 * 79 * Return TEE_SUCCESS on successful probe, 80 * TEE_ERROR_DEFER_DRIVER_INIT if probe must be deferred 81 * TEE_ERROR_ITEM_NOT_FOUND when no driver matched node's compatible string 82 * Any other TEE_ERROR_* compliant code. 83 */ 84 typedef TEE_Result (*dt_driver_probe_func)(const void *fdt, int nodeoffset, 85 const void *compat_data); 86 87 #if defined(CFG_DT) 88 /* 89 * Driver instance registered to be probed on compatible node found in the DT. 90 * 91 * @name: Driver name 92 * @type: Drive type 93 * @match_table: Compatible matching identifiers, null terminated 94 * @driver: Driver private reference or NULL 95 * @probe: Probe callback (see dt_driver_probe_func) or NULL 96 */ 97 struct dt_driver { 98 const char *name; 99 enum dt_driver_type type; 100 const struct dt_device_match *match_table; /* null-terminated */ 101 const void *driver; 102 TEE_Result (*probe)(const void *fdt, int node, const void *compat_data); 103 }; 104 105 #define DEFINE_DT_DRIVER(name) \ 106 SCATTERED_ARRAY_DEFINE_PG_ITEM(dt_drivers, struct dt_driver) 107 108 /* 109 * Find a driver that is suitable for the given DT node, that is, with 110 * a matching "compatible" property. 111 * 112 * @fdt: pointer to the device tree 113 * @offs: node offset 114 */ 115 const struct dt_driver *dt_find_compatible_driver(const void *fdt, int offs); 116 117 /* 118 * Map a device into secure or non-secure memory and return the base VA and 119 * the mapping size. The mapping is done with type MEM_AREA_IO_SEC or 120 * MEM_AREA_IO_NSEC, depending on the device status. 121 * If the mapping already exists, the function simply returns the @vbase and 122 * @size information. 123 * 124 * @offs is the offset of the node that describes the device in @fdt. 125 * @base receives the base virtual address corresponding to the base physical 126 * address of the "reg" property 127 * @size receives the size of the mapping 128 * 129 * Returns 0 on success or -1 in case of error. 130 */ 131 int dt_map_dev(const void *fdt, int offs, vaddr_t *base, size_t *size); 132 133 /* 134 * Check whether the node at @offs contains the property with propname or not. 135 * 136 * @offs is the offset of the node that describes the device in @fdt. 137 * @propname is the property that need to check 138 * 139 * Returns true on success or false if no propname. 140 */ 141 bool dt_have_prop(const void *fdt, int offs, const char *propname); 142 143 /* 144 * Modify or add "status" property to "disabled" 145 * 146 * @fdt reference to the Device Tree 147 * @node is the node offset to modify 148 * 149 * Returns 0 on success or -1 on failure 150 */ 151 int dt_disable_status(void *fdt, int node); 152 153 /* 154 * Force secure-status = "okay" and status="disabled" for the target node. 155 * 156 * @fdt reference to the Device Tree 157 * @node is the node offset to modify 158 * 159 * Returns 0 on success or -1 on failure 160 */ 161 int dt_enable_secure_status(void *fdt, int node); 162 163 /* 164 * FDT manipulation functions, not provided by <libfdt.h> 165 */ 166 167 /* 168 * Return the base address for the "reg" property of the specified node or 169 * (paddr_t)-1 in case of error 170 */ 171 paddr_t _fdt_reg_base_address(const void *fdt, int offs); 172 173 /* 174 * Return the reg size for the reg property of the specified node or -1 in case 175 * of error 176 */ 177 size_t _fdt_reg_size(const void *fdt, int offs); 178 179 /* 180 * Read the status and secure-status properties into a bitfield. 181 * Return -1 on failure, DT_STATUS_DISABLED if the node is disabled, 182 * otherwise return a combination of DT_STATUS_OK_NSEC and DT_STATUS_OK_SEC. 183 */ 184 int _fdt_get_status(const void *fdt, int offs); 185 186 /* 187 * fdt_fill_device_info - Get generic device info from a node 188 * 189 * This function fills the generic information from a given node. 190 * Currently supports a single base register, a single clock, 191 * a single reset ID line and a single interrupt ID. 192 * Default DT_INFO_* macros are used when the relate property is not found. 193 */ 194 void _fdt_fill_device_info(const void *fdt, struct dt_node_info *info, 195 int node); 196 197 #else /* !CFG_DT */ 198 199 static inline const struct dt_driver *dt_find_compatible_driver( 200 const void *fdt __unused, 201 int offs __unused) 202 { 203 return NULL; 204 } 205 206 static inline int dt_map_dev(const void *fdt __unused, int offs __unused, 207 vaddr_t *vbase __unused, size_t *size __unused) 208 { 209 return -1; 210 } 211 212 static inline paddr_t _fdt_reg_base_address(const void *fdt __unused, 213 int offs __unused) 214 { 215 return (paddr_t)-1; 216 } 217 218 static inline size_t _fdt_reg_size(const void *fdt __unused, 219 int offs __unused) 220 { 221 return (size_t)-1; 222 } 223 224 static inline int _fdt_get_status(const void *fdt __unused, int offs __unused) 225 { 226 return -1; 227 } 228 229 __noreturn 230 static inline void _fdt_fill_device_info(const void *fdt __unused, 231 struct dt_node_info *info __unused, 232 int node __unused) 233 { 234 panic(); 235 } 236 #endif /* !CFG_DT */ 237 238 #define for_each_dt_driver(drv) \ 239 for (drv = SCATTERED_ARRAY_BEGIN(dt_drivers, struct dt_driver); \ 240 drv < SCATTERED_ARRAY_END(dt_drivers, struct dt_driver); \ 241 drv++) 242 243 #endif /* KERNEL_DT_H */ 244