1 /* 2 * Copyright (C) 2017 Spreadtrum Communications Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <linux/delay.h> 8 #include <linux/hwspinlock.h> 9 #include <linux/init.h> 10 #include <linux/io.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/of_device.h> 15 #include <linux/platform_device.h> 16 #include <linux/reboot.h> 17 #include <linux/spi/spi.h> 18 #include <linux/sizes.h> 19 20 /* Registers definitions for ADI controller */ 21 #define REG_ADI_CTRL0 0x4 22 #define REG_ADI_CHN_PRIL 0x8 23 #define REG_ADI_CHN_PRIH 0xc 24 #define REG_ADI_INT_EN 0x10 25 #define REG_ADI_INT_RAW 0x14 26 #define REG_ADI_INT_MASK 0x18 27 #define REG_ADI_INT_CLR 0x1c 28 #define REG_ADI_GSSI_CFG0 0x20 29 #define REG_ADI_GSSI_CFG1 0x24 30 #define REG_ADI_RD_CMD 0x28 31 #define REG_ADI_RD_DATA 0x2c 32 #define REG_ADI_ARM_FIFO_STS 0x30 33 #define REG_ADI_STS 0x34 34 #define REG_ADI_EVT_FIFO_STS 0x38 35 #define REG_ADI_ARM_CMD_STS 0x3c 36 #define REG_ADI_CHN_EN 0x40 37 #define REG_ADI_CHN_ADDR(id) (0x44 + (id - 2) * 4) 38 #define REG_ADI_CHN_EN1 0x20c 39 40 /* Bits definitions for register REG_ADI_GSSI_CFG0 */ 41 #define BIT_CLK_ALL_ON BIT(30) 42 43 /* Bits definitions for register REG_ADI_RD_DATA */ 44 #define BIT_RD_CMD_BUSY BIT(31) 45 #define RD_ADDR_SHIFT 16 46 #define RD_VALUE_MASK GENMASK(15, 0) 47 #define RD_ADDR_MASK GENMASK(30, 16) 48 49 /* Bits definitions for register REG_ADI_ARM_FIFO_STS */ 50 #define BIT_FIFO_FULL BIT(11) 51 #define BIT_FIFO_EMPTY BIT(10) 52 53 /* 54 * ADI slave devices include RTC, ADC, regulator, charger, thermal and so on. 55 * The slave devices address offset is always 0x8000 and size is 4K. 56 */ 57 #define ADI_SLAVE_ADDR_SIZE SZ_4K 58 #define ADI_SLAVE_OFFSET 0x8000 59 60 /* Timeout (ms) for the trylock of hardware spinlocks */ 61 #define ADI_HWSPINLOCK_TIMEOUT 5000 62 /* 63 * ADI controller has 50 channels including 2 software channels 64 * and 48 hardware channels. 65 */ 66 #define ADI_HW_CHNS 50 67 68 #define ADI_FIFO_DRAIN_TIMEOUT 1000 69 #define ADI_READ_TIMEOUT 2000 70 #define REG_ADDR_LOW_MASK GENMASK(11, 0) 71 72 /* Registers definitions for PMIC watchdog controller */ 73 #define REG_WDG_LOAD_LOW 0x80 74 #define REG_WDG_LOAD_HIGH 0x84 75 #define REG_WDG_CTRL 0x88 76 #define REG_WDG_LOCK 0xa0 77 78 /* Bits definitions for register REG_WDG_CTRL */ 79 #define BIT_WDG_RUN BIT(1) 80 #define BIT_WDG_NEW BIT(2) 81 #define BIT_WDG_RST BIT(3) 82 83 /* Registers definitions for PMIC */ 84 #define PMIC_RST_STATUS 0xee8 85 #define PMIC_MODULE_EN 0xc08 86 #define PMIC_CLK_EN 0xc18 87 #define BIT_WDG_EN BIT(2) 88 89 /* Definition of PMIC reset status register */ 90 #define HWRST_STATUS_SECURITY 0x02 91 #define HWRST_STATUS_RECOVERY 0x20 92 #define HWRST_STATUS_NORMAL 0x40 93 #define HWRST_STATUS_ALARM 0x50 94 #define HWRST_STATUS_SLEEP 0x60 95 #define HWRST_STATUS_FASTBOOT 0x30 96 #define HWRST_STATUS_SPECIAL 0x70 97 #define HWRST_STATUS_PANIC 0x80 98 #define HWRST_STATUS_CFTREBOOT 0x90 99 #define HWRST_STATUS_AUTODLOADER 0xa0 100 #define HWRST_STATUS_IQMODE 0xb0 101 #define HWRST_STATUS_SPRDISK 0xc0 102 #define HWRST_STATUS_FACTORYTEST 0xe0 103 #define HWRST_STATUS_WATCHDOG 0xf0 104 105 /* Use default timeout 50 ms that converts to watchdog values */ 106 #define WDG_LOAD_VAL ((50 * 1000) / 32768) 107 #define WDG_LOAD_MASK GENMASK(15, 0) 108 #define WDG_UNLOCK_KEY 0xe551 109 110 struct sprd_adi { 111 struct spi_controller *ctlr; 112 struct device *dev; 113 void __iomem *base; 114 struct hwspinlock *hwlock; 115 unsigned long slave_vbase; 116 unsigned long slave_pbase; 117 struct notifier_block restart_handler; 118 }; 119 120 static int sprd_adi_check_paddr(struct sprd_adi *sadi, u32 paddr) 121 { 122 if (paddr < sadi->slave_pbase || paddr > 123 (sadi->slave_pbase + ADI_SLAVE_ADDR_SIZE)) { 124 dev_err(sadi->dev, 125 "slave physical address is incorrect, addr = 0x%x\n", 126 paddr); 127 return -EINVAL; 128 } 129 130 return 0; 131 } 132 133 static unsigned long sprd_adi_to_vaddr(struct sprd_adi *sadi, u32 paddr) 134 { 135 return (paddr - sadi->slave_pbase + sadi->slave_vbase); 136 } 137 138 static int sprd_adi_drain_fifo(struct sprd_adi *sadi) 139 { 140 u32 timeout = ADI_FIFO_DRAIN_TIMEOUT; 141 u32 sts; 142 143 do { 144 sts = readl_relaxed(sadi->base + REG_ADI_ARM_FIFO_STS); 145 if (sts & BIT_FIFO_EMPTY) 146 break; 147 148 cpu_relax(); 149 } while (--timeout); 150 151 if (timeout == 0) { 152 dev_err(sadi->dev, "drain write fifo timeout\n"); 153 return -EBUSY; 154 } 155 156 return 0; 157 } 158 159 static int sprd_adi_fifo_is_full(struct sprd_adi *sadi) 160 { 161 return readl_relaxed(sadi->base + REG_ADI_ARM_FIFO_STS) & BIT_FIFO_FULL; 162 } 163 164 static int sprd_adi_read(struct sprd_adi *sadi, u32 reg_paddr, u32 *read_val) 165 { 166 int read_timeout = ADI_READ_TIMEOUT; 167 unsigned long flags; 168 u32 val, rd_addr; 169 int ret = 0; 170 171 if (sadi->hwlock) { 172 ret = hwspin_lock_timeout_irqsave(sadi->hwlock, 173 ADI_HWSPINLOCK_TIMEOUT, 174 &flags); 175 if (ret) { 176 dev_err(sadi->dev, "get the hw lock failed\n"); 177 return ret; 178 } 179 } 180 181 /* 182 * Set the physical register address need to read into RD_CMD register, 183 * then ADI controller will start to transfer automatically. 184 */ 185 writel_relaxed(reg_paddr, sadi->base + REG_ADI_RD_CMD); 186 187 /* 188 * Wait read operation complete, the BIT_RD_CMD_BUSY will be set 189 * simultaneously when writing read command to register, and the 190 * BIT_RD_CMD_BUSY will be cleared after the read operation is 191 * completed. 192 */ 193 do { 194 val = readl_relaxed(sadi->base + REG_ADI_RD_DATA); 195 if (!(val & BIT_RD_CMD_BUSY)) 196 break; 197 198 cpu_relax(); 199 } while (--read_timeout); 200 201 if (read_timeout == 0) { 202 dev_err(sadi->dev, "ADI read timeout\n"); 203 ret = -EBUSY; 204 goto out; 205 } 206 207 /* 208 * The return value includes data and read register address, from bit 0 209 * to bit 15 are data, and from bit 16 to bit 30 are read register 210 * address. Then we can check the returned register address to validate 211 * data. 212 */ 213 rd_addr = (val & RD_ADDR_MASK ) >> RD_ADDR_SHIFT; 214 215 if (rd_addr != (reg_paddr & REG_ADDR_LOW_MASK)) { 216 dev_err(sadi->dev, "read error, reg addr = 0x%x, val = 0x%x\n", 217 reg_paddr, val); 218 ret = -EIO; 219 goto out; 220 } 221 222 *read_val = val & RD_VALUE_MASK; 223 224 out: 225 if (sadi->hwlock) 226 hwspin_unlock_irqrestore(sadi->hwlock, &flags); 227 return ret; 228 } 229 230 static int sprd_adi_write(struct sprd_adi *sadi, u32 reg_paddr, u32 val) 231 { 232 unsigned long reg = sprd_adi_to_vaddr(sadi, reg_paddr); 233 u32 timeout = ADI_FIFO_DRAIN_TIMEOUT; 234 unsigned long flags; 235 int ret; 236 237 if (sadi->hwlock) { 238 ret = hwspin_lock_timeout_irqsave(sadi->hwlock, 239 ADI_HWSPINLOCK_TIMEOUT, 240 &flags); 241 if (ret) { 242 dev_err(sadi->dev, "get the hw lock failed\n"); 243 return ret; 244 } 245 } 246 247 ret = sprd_adi_drain_fifo(sadi); 248 if (ret < 0) 249 goto out; 250 251 /* 252 * we should wait for write fifo is empty before writing data to PMIC 253 * registers. 254 */ 255 do { 256 if (!sprd_adi_fifo_is_full(sadi)) { 257 writel_relaxed(val, (void __iomem *)reg); 258 break; 259 } 260 261 cpu_relax(); 262 } while (--timeout); 263 264 if (timeout == 0) { 265 dev_err(sadi->dev, "write fifo is full\n"); 266 ret = -EBUSY; 267 } 268 269 out: 270 if (sadi->hwlock) 271 hwspin_unlock_irqrestore(sadi->hwlock, &flags); 272 return ret; 273 } 274 275 static int sprd_adi_transfer_one(struct spi_controller *ctlr, 276 struct spi_device *spi_dev, 277 struct spi_transfer *t) 278 { 279 struct sprd_adi *sadi = spi_controller_get_devdata(ctlr); 280 u32 phy_reg, val; 281 int ret; 282 283 if (t->rx_buf) { 284 phy_reg = *(u32 *)t->rx_buf + sadi->slave_pbase; 285 286 ret = sprd_adi_check_paddr(sadi, phy_reg); 287 if (ret) 288 return ret; 289 290 ret = sprd_adi_read(sadi, phy_reg, &val); 291 if (ret) 292 return ret; 293 294 *(u32 *)t->rx_buf = val; 295 } else if (t->tx_buf) { 296 u32 *p = (u32 *)t->tx_buf; 297 298 /* 299 * Get the physical register address need to write and convert 300 * the physical address to virtual address. Since we need 301 * virtual register address to write. 302 */ 303 phy_reg = *p++ + sadi->slave_pbase; 304 ret = sprd_adi_check_paddr(sadi, phy_reg); 305 if (ret) 306 return ret; 307 308 val = *p; 309 ret = sprd_adi_write(sadi, phy_reg, val); 310 if (ret) 311 return ret; 312 } else { 313 dev_err(sadi->dev, "no buffer for transfer\n"); 314 return -EINVAL; 315 } 316 317 return 0; 318 } 319 320 static void sprd_adi_set_wdt_rst_mode(struct sprd_adi *sadi) 321 { 322 #if IS_ENABLED(CONFIG_SPRD_WATCHDOG) 323 u32 val; 324 325 /* Set default watchdog reboot mode */ 326 sprd_adi_read(sadi, sadi->slave_pbase + PMIC_RST_STATUS, &val); 327 val |= HWRST_STATUS_WATCHDOG; 328 sprd_adi_write(sadi, sadi->slave_pbase + PMIC_RST_STATUS, val); 329 #endif 330 } 331 332 static int sprd_adi_restart_handler(struct notifier_block *this, 333 unsigned long mode, void *cmd) 334 { 335 struct sprd_adi *sadi = container_of(this, struct sprd_adi, 336 restart_handler); 337 u32 val, reboot_mode = 0; 338 339 if (!cmd) 340 reboot_mode = HWRST_STATUS_NORMAL; 341 else if (!strncmp(cmd, "recovery", 8)) 342 reboot_mode = HWRST_STATUS_RECOVERY; 343 else if (!strncmp(cmd, "alarm", 5)) 344 reboot_mode = HWRST_STATUS_ALARM; 345 else if (!strncmp(cmd, "fastsleep", 9)) 346 reboot_mode = HWRST_STATUS_SLEEP; 347 else if (!strncmp(cmd, "bootloader", 10)) 348 reboot_mode = HWRST_STATUS_FASTBOOT; 349 else if (!strncmp(cmd, "panic", 5)) 350 reboot_mode = HWRST_STATUS_PANIC; 351 else if (!strncmp(cmd, "special", 7)) 352 reboot_mode = HWRST_STATUS_SPECIAL; 353 else if (!strncmp(cmd, "cftreboot", 9)) 354 reboot_mode = HWRST_STATUS_CFTREBOOT; 355 else if (!strncmp(cmd, "autodloader", 11)) 356 reboot_mode = HWRST_STATUS_AUTODLOADER; 357 else if (!strncmp(cmd, "iqmode", 6)) 358 reboot_mode = HWRST_STATUS_IQMODE; 359 else if (!strncmp(cmd, "sprdisk", 7)) 360 reboot_mode = HWRST_STATUS_SPRDISK; 361 else if (!strncmp(cmd, "tospanic", 8)) 362 reboot_mode = HWRST_STATUS_SECURITY; 363 else if (!strncmp(cmd, "factorytest", 11)) 364 reboot_mode = HWRST_STATUS_FACTORYTEST; 365 else 366 reboot_mode = HWRST_STATUS_NORMAL; 367 368 /* Record the reboot mode */ 369 sprd_adi_read(sadi, sadi->slave_pbase + PMIC_RST_STATUS, &val); 370 val &= ~HWRST_STATUS_WATCHDOG; 371 val |= reboot_mode; 372 sprd_adi_write(sadi, sadi->slave_pbase + PMIC_RST_STATUS, val); 373 374 /* Enable the interface clock of the watchdog */ 375 sprd_adi_read(sadi, sadi->slave_pbase + PMIC_MODULE_EN, &val); 376 val |= BIT_WDG_EN; 377 sprd_adi_write(sadi, sadi->slave_pbase + PMIC_MODULE_EN, val); 378 379 /* Enable the work clock of the watchdog */ 380 sprd_adi_read(sadi, sadi->slave_pbase + PMIC_CLK_EN, &val); 381 val |= BIT_WDG_EN; 382 sprd_adi_write(sadi, sadi->slave_pbase + PMIC_CLK_EN, val); 383 384 /* Unlock the watchdog */ 385 sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, WDG_UNLOCK_KEY); 386 387 sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val); 388 val |= BIT_WDG_NEW; 389 sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val); 390 391 /* Load the watchdog timeout value, 50ms is always enough. */ 392 sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_HIGH, 0); 393 sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_LOW, 394 WDG_LOAD_VAL & WDG_LOAD_MASK); 395 396 /* Start the watchdog to reset system */ 397 sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val); 398 val |= BIT_WDG_RUN | BIT_WDG_RST; 399 sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val); 400 401 /* Lock the watchdog */ 402 sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, ~WDG_UNLOCK_KEY); 403 404 mdelay(1000); 405 406 dev_emerg(sadi->dev, "Unable to restart system\n"); 407 return NOTIFY_DONE; 408 } 409 410 static void sprd_adi_hw_init(struct sprd_adi *sadi) 411 { 412 struct device_node *np = sadi->dev->of_node; 413 int i, size, chn_cnt; 414 const __be32 *list; 415 u32 tmp; 416 417 /* Set all channels as default priority */ 418 writel_relaxed(0, sadi->base + REG_ADI_CHN_PRIL); 419 writel_relaxed(0, sadi->base + REG_ADI_CHN_PRIH); 420 421 /* Set clock auto gate mode */ 422 tmp = readl_relaxed(sadi->base + REG_ADI_GSSI_CFG0); 423 tmp &= ~BIT_CLK_ALL_ON; 424 writel_relaxed(tmp, sadi->base + REG_ADI_GSSI_CFG0); 425 426 /* Set hardware channels setting */ 427 list = of_get_property(np, "sprd,hw-channels", &size); 428 if (!list || !size) { 429 dev_info(sadi->dev, "no hw channels setting in node\n"); 430 return; 431 } 432 433 chn_cnt = size / 8; 434 for (i = 0; i < chn_cnt; i++) { 435 u32 value; 436 u32 chn_id = be32_to_cpu(*list++); 437 u32 chn_config = be32_to_cpu(*list++); 438 439 /* Channel 0 and 1 are software channels */ 440 if (chn_id < 2) 441 continue; 442 443 writel_relaxed(chn_config, sadi->base + 444 REG_ADI_CHN_ADDR(chn_id)); 445 446 if (chn_id < 32) { 447 value = readl_relaxed(sadi->base + REG_ADI_CHN_EN); 448 value |= BIT(chn_id); 449 writel_relaxed(value, sadi->base + REG_ADI_CHN_EN); 450 } else if (chn_id < ADI_HW_CHNS) { 451 value = readl_relaxed(sadi->base + REG_ADI_CHN_EN1); 452 value |= BIT(chn_id - 32); 453 writel_relaxed(value, sadi->base + REG_ADI_CHN_EN1); 454 } 455 } 456 } 457 458 static int sprd_adi_probe(struct platform_device *pdev) 459 { 460 struct device_node *np = pdev->dev.of_node; 461 struct spi_controller *ctlr; 462 struct sprd_adi *sadi; 463 struct resource *res; 464 u32 num_chipselect; 465 int ret; 466 467 if (!np) { 468 dev_err(&pdev->dev, "can not find the adi bus node\n"); 469 return -ENODEV; 470 } 471 472 pdev->id = of_alias_get_id(np, "spi"); 473 num_chipselect = of_get_child_count(np); 474 475 ctlr = spi_alloc_master(&pdev->dev, sizeof(struct sprd_adi)); 476 if (!ctlr) 477 return -ENOMEM; 478 479 dev_set_drvdata(&pdev->dev, ctlr); 480 sadi = spi_controller_get_devdata(ctlr); 481 482 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 483 sadi->base = devm_ioremap_resource(&pdev->dev, res); 484 if (IS_ERR(sadi->base)) { 485 ret = PTR_ERR(sadi->base); 486 goto put_ctlr; 487 } 488 489 sadi->slave_vbase = (unsigned long)sadi->base + ADI_SLAVE_OFFSET; 490 sadi->slave_pbase = res->start + ADI_SLAVE_OFFSET; 491 sadi->ctlr = ctlr; 492 sadi->dev = &pdev->dev; 493 ret = of_hwspin_lock_get_id(np, 0); 494 if (ret > 0 || (IS_ENABLED(CONFIG_HWSPINLOCK) && ret == 0)) { 495 sadi->hwlock = 496 devm_hwspin_lock_request_specific(&pdev->dev, ret); 497 if (!sadi->hwlock) { 498 ret = -ENXIO; 499 goto put_ctlr; 500 } 501 } else { 502 switch (ret) { 503 case -ENOENT: 504 dev_info(&pdev->dev, "no hardware spinlock supplied\n"); 505 break; 506 default: 507 dev_err_probe(&pdev->dev, ret, "failed to find hwlock id\n"); 508 goto put_ctlr; 509 } 510 } 511 512 sprd_adi_hw_init(sadi); 513 sprd_adi_set_wdt_rst_mode(sadi); 514 515 ctlr->dev.of_node = pdev->dev.of_node; 516 ctlr->bus_num = pdev->id; 517 ctlr->num_chipselect = num_chipselect; 518 ctlr->flags = SPI_MASTER_HALF_DUPLEX; 519 ctlr->bits_per_word_mask = 0; 520 ctlr->transfer_one = sprd_adi_transfer_one; 521 522 ret = devm_spi_register_controller(&pdev->dev, ctlr); 523 if (ret) { 524 dev_err(&pdev->dev, "failed to register SPI controller\n"); 525 goto put_ctlr; 526 } 527 528 sadi->restart_handler.notifier_call = sprd_adi_restart_handler; 529 sadi->restart_handler.priority = 128; 530 ret = register_restart_handler(&sadi->restart_handler); 531 if (ret) { 532 dev_err(&pdev->dev, "can not register restart handler\n"); 533 goto put_ctlr; 534 } 535 536 return 0; 537 538 put_ctlr: 539 spi_controller_put(ctlr); 540 return ret; 541 } 542 543 static int sprd_adi_remove(struct platform_device *pdev) 544 { 545 struct spi_controller *ctlr = dev_get_drvdata(&pdev->dev); 546 struct sprd_adi *sadi = spi_controller_get_devdata(ctlr); 547 548 unregister_restart_handler(&sadi->restart_handler); 549 return 0; 550 } 551 552 static const struct of_device_id sprd_adi_of_match[] = { 553 { 554 .compatible = "sprd,sc9860-adi", 555 }, 556 { }, 557 }; 558 MODULE_DEVICE_TABLE(of, sprd_adi_of_match); 559 560 static struct platform_driver sprd_adi_driver = { 561 .driver = { 562 .name = "sprd-adi", 563 .of_match_table = sprd_adi_of_match, 564 }, 565 .probe = sprd_adi_probe, 566 .remove = sprd_adi_remove, 567 }; 568 module_platform_driver(sprd_adi_driver); 569 570 MODULE_DESCRIPTION("Spreadtrum ADI Controller Driver"); 571 MODULE_AUTHOR("Baolin Wang <Baolin.Wang@spreadtrum.com>"); 572 MODULE_LICENSE("GPL v2"); 573