1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Firmware loading. 4 * 5 * Copyright (c) 2017-2020, Silicon Laboratories, Inc. 6 * Copyright (c) 2010, ST-Ericsson 7 */ 8 #include <linux/firmware.h> 9 #include <linux/slab.h> 10 #include <linux/mm.h> 11 #include <linux/bitfield.h> 12 13 #include "fwio.h" 14 #include "wfx.h" 15 #include "hwio.h" 16 17 /* Addresses below are in SRAM area */ 18 #define WFX_DNLD_FIFO 0x09004000 19 #define DNLD_BLOCK_SIZE 0x0400 20 #define DNLD_FIFO_SIZE 0x8000 /* (32 * DNLD_BLOCK_SIZE) */ 21 /* Download Control Area (DCA) */ 22 #define WFX_DCA_IMAGE_SIZE 0x0900C000 23 #define WFX_DCA_PUT 0x0900C004 24 #define WFX_DCA_GET 0x0900C008 25 #define WFX_DCA_HOST_STATUS 0x0900C00C 26 #define HOST_READY 0x87654321 27 #define HOST_INFO_READ 0xA753BD99 28 #define HOST_UPLOAD_PENDING 0xABCDDCBA 29 #define HOST_UPLOAD_COMPLETE 0xD4C64A99 30 #define HOST_OK_TO_JUMP 0x174FC882 31 #define WFX_DCA_NCP_STATUS 0x0900C010 32 #define NCP_NOT_READY 0x12345678 33 #define NCP_READY 0x87654321 34 #define NCP_INFO_READY 0xBD53EF99 35 #define NCP_DOWNLOAD_PENDING 0xABCDDCBA 36 #define NCP_DOWNLOAD_COMPLETE 0xCAFEFECA 37 #define NCP_AUTH_OK 0xD4C64A99 38 #define NCP_AUTH_FAIL 0x174FC882 39 #define NCP_PUB_KEY_RDY 0x7AB41D19 40 #define WFX_DCA_FW_SIGNATURE 0x0900C014 41 #define FW_SIGNATURE_SIZE 0x40 42 #define WFX_DCA_FW_HASH 0x0900C054 43 #define FW_HASH_SIZE 0x08 44 #define WFX_DCA_FW_VERSION 0x0900C05C 45 #define FW_VERSION_SIZE 0x04 46 #define WFX_DCA_RESERVED 0x0900C060 47 #define DCA_RESERVED_SIZE 0x20 48 #define WFX_STATUS_INFO 0x0900C080 49 #define WFX_BOOTLOADER_LABEL 0x0900C084 50 #define BOOTLOADER_LABEL_SIZE 0x3C 51 #define WFX_PTE_INFO 0x0900C0C0 52 #define PTE_INFO_KEYSET_IDX 0x0D 53 #define PTE_INFO_SIZE 0x10 54 #define WFX_ERR_INFO 0x0900C0D0 55 #define ERR_INVALID_SEC_TYPE 0x05 56 #define ERR_SIG_VERIF_FAILED 0x0F 57 #define ERR_AES_CTRL_KEY 0x10 58 #define ERR_ECC_PUB_KEY 0x11 59 #define ERR_MAC_KEY 0x18 60 61 #define DCA_TIMEOUT 50 /* milliseconds */ 62 #define WAKEUP_TIMEOUT 200 /* milliseconds */ 63 64 static const char * const fwio_errors[] = { 65 [ERR_INVALID_SEC_TYPE] = "Invalid section type or wrong encryption", 66 [ERR_SIG_VERIF_FAILED] = "Signature verification failed", 67 [ERR_AES_CTRL_KEY] = "AES control key not initialized", 68 [ERR_ECC_PUB_KEY] = "ECC public key not initialized", 69 [ERR_MAC_KEY] = "MAC key not initialized", 70 }; 71 72 /* request_firmware() allocate data using vmalloc(). It is not compatible with underlying hardware 73 * that use DMA. Function below detect this case and allocate a bounce buffer if necessary. 74 * 75 * Notice that, in doubt, you can enable CONFIG_DEBUG_SG to ask kernel to detect this problem at 76 * runtime (else, kernel silently fail). 77 * 78 * NOTE: it may also be possible to use 'pages' from struct firmware and avoid bounce buffer 79 */ wfx_sram_write_dma_safe(struct wfx_dev * wdev,u32 addr,const u8 * buf,size_t len)80 static int wfx_sram_write_dma_safe(struct wfx_dev *wdev, u32 addr, const u8 *buf, size_t len) 81 { 82 int ret; 83 const u8 *tmp; 84 85 if (!virt_addr_valid(buf)) { 86 tmp = kmemdup(buf, len, GFP_KERNEL); 87 if (!tmp) 88 return -ENOMEM; 89 } else { 90 tmp = buf; 91 } 92 ret = wfx_sram_buf_write(wdev, addr, tmp, len); 93 if (tmp != buf) 94 kfree(tmp); 95 return ret; 96 } 97 get_firmware(struct wfx_dev * wdev,u32 keyset_chip,const struct firmware ** fw,int * file_offset)98 static int get_firmware(struct wfx_dev *wdev, u32 keyset_chip, 99 const struct firmware **fw, int *file_offset) 100 { 101 int keyset_file; 102 char filename[256]; 103 const char *data; 104 int ret; 105 106 snprintf(filename, sizeof(filename), "%s_%02X.sec", 107 wdev->pdata.file_fw, keyset_chip); 108 ret = firmware_request_nowarn(fw, filename, wdev->dev); 109 if (ret) { 110 dev_info(wdev->dev, "can't load %s, falling back to %s.sec\n", 111 filename, wdev->pdata.file_fw); 112 snprintf(filename, sizeof(filename), "%s.sec", wdev->pdata.file_fw); 113 ret = request_firmware(fw, filename, wdev->dev); 114 if (ret) { 115 dev_err(wdev->dev, "can't load %s\n", filename); 116 *fw = NULL; 117 return ret; 118 } 119 } 120 121 data = (*fw)->data; 122 if (memcmp(data, "KEYSET", 6) != 0) { 123 /* Legacy firmware format */ 124 *file_offset = 0; 125 keyset_file = 0x90; 126 } else { 127 *file_offset = 8; 128 keyset_file = (hex_to_bin(data[6]) * 16) | hex_to_bin(data[7]); 129 if (keyset_file < 0) { 130 dev_err(wdev->dev, "%s corrupted\n", filename); 131 release_firmware(*fw); 132 *fw = NULL; 133 return -EINVAL; 134 } 135 } 136 if (keyset_file != keyset_chip) { 137 dev_err(wdev->dev, "firmware keyset is incompatible with chip (file: 0x%02X, chip: 0x%02X)\n", 138 keyset_file, keyset_chip); 139 release_firmware(*fw); 140 *fw = NULL; 141 return -ENODEV; 142 } 143 wdev->keyset = keyset_file; 144 return 0; 145 } 146 wait_ncp_status(struct wfx_dev * wdev,u32 status)147 static int wait_ncp_status(struct wfx_dev *wdev, u32 status) 148 { 149 ktime_t now, start; 150 u32 reg; 151 int ret; 152 153 start = ktime_get(); 154 for (;;) { 155 ret = wfx_sram_reg_read(wdev, WFX_DCA_NCP_STATUS, ®); 156 if (ret < 0) 157 return -EIO; 158 now = ktime_get(); 159 if (reg == status) 160 break; 161 if (ktime_after(now, ktime_add_ms(start, DCA_TIMEOUT))) 162 return -ETIMEDOUT; 163 } 164 if (ktime_compare(now, start)) 165 dev_dbg(wdev->dev, "chip answer after %lldus\n", ktime_us_delta(now, start)); 166 else 167 dev_dbg(wdev->dev, "chip answer immediately\n"); 168 return 0; 169 } 170 upload_firmware(struct wfx_dev * wdev,const u8 * data,size_t len)171 static int upload_firmware(struct wfx_dev *wdev, const u8 *data, size_t len) 172 { 173 int ret; 174 u32 offs, bytes_done = 0; 175 ktime_t now, start; 176 177 if (len % DNLD_BLOCK_SIZE) { 178 dev_err(wdev->dev, "firmware size is not aligned. Buffer overrun will occur\n"); 179 return -EIO; 180 } 181 offs = 0; 182 while (offs < len) { 183 start = ktime_get(); 184 for (;;) { 185 now = ktime_get(); 186 if (offs + DNLD_BLOCK_SIZE - bytes_done < DNLD_FIFO_SIZE) 187 break; 188 if (ktime_after(now, ktime_add_ms(start, DCA_TIMEOUT))) 189 return -ETIMEDOUT; 190 ret = wfx_sram_reg_read(wdev, WFX_DCA_GET, &bytes_done); 191 if (ret < 0) 192 return ret; 193 } 194 if (ktime_compare(now, start)) 195 dev_dbg(wdev->dev, "answer after %lldus\n", ktime_us_delta(now, start)); 196 197 ret = wfx_sram_write_dma_safe(wdev, WFX_DNLD_FIFO + (offs % DNLD_FIFO_SIZE), 198 data + offs, DNLD_BLOCK_SIZE); 199 if (ret < 0) 200 return ret; 201 202 /* The device seems to not support writing 0 in this register during first loop */ 203 offs += DNLD_BLOCK_SIZE; 204 ret = wfx_sram_reg_write(wdev, WFX_DCA_PUT, offs); 205 if (ret < 0) 206 return ret; 207 } 208 return 0; 209 } 210 print_boot_status(struct wfx_dev * wdev)211 static void print_boot_status(struct wfx_dev *wdev) 212 { 213 u32 reg; 214 215 wfx_sram_reg_read(wdev, WFX_STATUS_INFO, ®); 216 if (reg == 0x12345678) 217 return; 218 wfx_sram_reg_read(wdev, WFX_ERR_INFO, ®); 219 if (reg < ARRAY_SIZE(fwio_errors) && fwio_errors[reg]) 220 dev_info(wdev->dev, "secure boot: %s\n", fwio_errors[reg]); 221 else 222 dev_info(wdev->dev, "secure boot: Error %#02x\n", reg); 223 } 224 load_firmware_secure(struct wfx_dev * wdev)225 static int load_firmware_secure(struct wfx_dev *wdev) 226 { 227 const struct firmware *fw = NULL; 228 int header_size; 229 int fw_offset; 230 ktime_t start; 231 u8 *buf; 232 int ret; 233 234 BUILD_BUG_ON(PTE_INFO_SIZE > BOOTLOADER_LABEL_SIZE); 235 buf = kmalloc(BOOTLOADER_LABEL_SIZE + 1, GFP_KERNEL); 236 if (!buf) 237 return -ENOMEM; 238 239 wfx_sram_reg_write(wdev, WFX_DCA_HOST_STATUS, HOST_READY); 240 ret = wait_ncp_status(wdev, NCP_INFO_READY); 241 if (ret) 242 goto error; 243 244 wfx_sram_buf_read(wdev, WFX_BOOTLOADER_LABEL, buf, BOOTLOADER_LABEL_SIZE); 245 buf[BOOTLOADER_LABEL_SIZE] = 0; 246 dev_dbg(wdev->dev, "bootloader: \"%s\"\n", buf); 247 248 wfx_sram_buf_read(wdev, WFX_PTE_INFO, buf, PTE_INFO_SIZE); 249 ret = get_firmware(wdev, buf[PTE_INFO_KEYSET_IDX], &fw, &fw_offset); 250 if (ret) 251 goto error; 252 header_size = fw_offset + FW_SIGNATURE_SIZE + FW_HASH_SIZE; 253 254 wfx_sram_reg_write(wdev, WFX_DCA_HOST_STATUS, HOST_INFO_READ); 255 ret = wait_ncp_status(wdev, NCP_READY); 256 if (ret) 257 goto error; 258 259 wfx_sram_reg_write(wdev, WFX_DNLD_FIFO, 0xFFFFFFFF); /* Fifo init */ 260 wfx_sram_write_dma_safe(wdev, WFX_DCA_FW_VERSION, "\x01\x00\x00\x00", FW_VERSION_SIZE); 261 wfx_sram_write_dma_safe(wdev, WFX_DCA_FW_SIGNATURE, fw->data + fw_offset, 262 FW_SIGNATURE_SIZE); 263 wfx_sram_write_dma_safe(wdev, WFX_DCA_FW_HASH, fw->data + fw_offset + FW_SIGNATURE_SIZE, 264 FW_HASH_SIZE); 265 wfx_sram_reg_write(wdev, WFX_DCA_IMAGE_SIZE, fw->size - header_size); 266 wfx_sram_reg_write(wdev, WFX_DCA_HOST_STATUS, HOST_UPLOAD_PENDING); 267 ret = wait_ncp_status(wdev, NCP_DOWNLOAD_PENDING); 268 if (ret) 269 goto error; 270 271 start = ktime_get(); 272 ret = upload_firmware(wdev, fw->data + header_size, fw->size - header_size); 273 if (ret) 274 goto error; 275 dev_dbg(wdev->dev, "firmware load after %lldus\n", 276 ktime_us_delta(ktime_get(), start)); 277 278 wfx_sram_reg_write(wdev, WFX_DCA_HOST_STATUS, HOST_UPLOAD_COMPLETE); 279 ret = wait_ncp_status(wdev, NCP_AUTH_OK); 280 /* Legacy ROM support */ 281 if (ret < 0) 282 ret = wait_ncp_status(wdev, NCP_PUB_KEY_RDY); 283 if (ret < 0) 284 goto error; 285 wfx_sram_reg_write(wdev, WFX_DCA_HOST_STATUS, HOST_OK_TO_JUMP); 286 287 error: 288 kfree(buf); 289 release_firmware(fw); 290 if (ret) 291 print_boot_status(wdev); 292 return ret; 293 } 294 init_gpr(struct wfx_dev * wdev)295 static int init_gpr(struct wfx_dev *wdev) 296 { 297 int ret, i; 298 static const struct { 299 int index; 300 u32 value; 301 } gpr_init[] = { 302 { 0x07, 0x208775 }, 303 { 0x08, 0x2EC020 }, 304 { 0x09, 0x3C3C3C }, 305 { 0x0B, 0x322C44 }, 306 { 0x0C, 0xA06497 }, 307 }; 308 309 for (i = 0; i < ARRAY_SIZE(gpr_init); i++) { 310 ret = wfx_igpr_reg_write(wdev, gpr_init[i].index, gpr_init[i].value); 311 if (ret < 0) 312 return ret; 313 dev_dbg(wdev->dev, " index %02x: %08x\n", gpr_init[i].index, gpr_init[i].value); 314 } 315 return 0; 316 } 317 wfx_init_device(struct wfx_dev * wdev)318 int wfx_init_device(struct wfx_dev *wdev) 319 { 320 int ret; 321 int hw_revision, hw_type; 322 int wakeup_timeout = 50; /* ms */ 323 ktime_t now, start; 324 u32 reg; 325 326 reg = CFG_DIRECT_ACCESS_MODE | CFG_CPU_RESET | CFG_BYTE_ORDER_ABCD; 327 if (wdev->pdata.use_rising_clk) 328 reg |= CFG_CLK_RISE_EDGE; 329 ret = wfx_config_reg_write(wdev, reg); 330 if (ret < 0) { 331 dev_err(wdev->dev, "bus returned an error during first write access. Host configuration error?\n"); 332 return -EIO; 333 } 334 335 ret = wfx_config_reg_read(wdev, ®); 336 if (ret < 0) { 337 dev_err(wdev->dev, "bus returned an error during first read access. Bus configuration error?\n"); 338 return -EIO; 339 } 340 if (reg == 0 || reg == ~0) { 341 dev_err(wdev->dev, "chip mute. Bus configuration error or chip wasn't reset?\n"); 342 return -EIO; 343 } 344 dev_dbg(wdev->dev, "initial config register value: %08x\n", reg); 345 346 hw_revision = FIELD_GET(CFG_DEVICE_ID_MAJOR, reg); 347 if (hw_revision == 0) { 348 dev_err(wdev->dev, "bad hardware revision number: %d\n", hw_revision); 349 return -ENODEV; 350 } 351 hw_type = FIELD_GET(CFG_DEVICE_ID_TYPE, reg); 352 if (hw_type == 1) { 353 dev_notice(wdev->dev, "development hardware detected\n"); 354 wakeup_timeout = 2000; 355 } 356 357 ret = init_gpr(wdev); 358 if (ret < 0) 359 return ret; 360 361 ret = wfx_control_reg_write(wdev, CTRL_WLAN_WAKEUP); 362 if (ret < 0) 363 return -EIO; 364 start = ktime_get(); 365 for (;;) { 366 ret = wfx_control_reg_read(wdev, ®); 367 now = ktime_get(); 368 if (reg & CTRL_WLAN_READY) 369 break; 370 if (ktime_after(now, ktime_add_ms(start, wakeup_timeout))) { 371 dev_err(wdev->dev, "chip didn't wake up. Chip wasn't reset?\n"); 372 return -ETIMEDOUT; 373 } 374 } 375 dev_dbg(wdev->dev, "chip wake up after %lldus\n", ktime_us_delta(now, start)); 376 377 ret = wfx_config_reg_write_bits(wdev, CFG_CPU_RESET, 0); 378 if (ret < 0) 379 return ret; 380 ret = load_firmware_secure(wdev); 381 if (ret < 0) 382 return ret; 383 return wfx_config_reg_write_bits(wdev, 384 CFG_DIRECT_ACCESS_MODE | 385 CFG_IRQ_ENABLE_DATA | 386 CFG_IRQ_ENABLE_WRDY, 387 CFG_IRQ_ENABLE_DATA); 388 } 389