1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Intel Atom SOC Power Management Controller Driver 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/debugfs.h> 10 #include <linux/device.h> 11 #include <linux/dmi.h> 12 #include <linux/init.h> 13 #include <linux/io.h> 14 #include <linux/platform_data/x86/clk-pmc-atom.h> 15 #include <linux/platform_data/x86/pmc_atom.h> 16 #include <linux/platform_device.h> 17 #include <linux/pci.h> 18 #include <linux/seq_file.h> 19 20 struct pmc_bit_map { 21 const char *name; 22 u32 bit_mask; 23 }; 24 25 struct pmc_reg_map { 26 const struct pmc_bit_map *d3_sts_0; 27 const struct pmc_bit_map *d3_sts_1; 28 const struct pmc_bit_map *func_dis; 29 const struct pmc_bit_map *func_dis_2; 30 const struct pmc_bit_map *pss; 31 }; 32 33 struct pmc_data { 34 const struct pmc_reg_map *map; 35 const struct pmc_clk *clks; 36 }; 37 38 struct pmc_dev { 39 u32 base_addr; 40 void __iomem *regmap; 41 const struct pmc_reg_map *map; 42 #ifdef CONFIG_DEBUG_FS 43 struct dentry *dbgfs_dir; 44 #endif /* CONFIG_DEBUG_FS */ 45 bool init; 46 }; 47 48 static struct pmc_dev pmc_device; 49 static u32 acpi_base_addr; 50 51 static const struct pmc_clk byt_clks[] = { 52 { 53 .name = "xtal", 54 .freq = 25000000, 55 .parent_name = NULL, 56 }, 57 { 58 .name = "pll", 59 .freq = 19200000, 60 .parent_name = "xtal", 61 }, 62 {}, 63 }; 64 65 static const struct pmc_clk cht_clks[] = { 66 { 67 .name = "xtal", 68 .freq = 19200000, 69 .parent_name = NULL, 70 }, 71 {}, 72 }; 73 74 static const struct pmc_bit_map d3_sts_0_map[] = { 75 {"LPSS1_F0_DMA", BIT_LPSS1_F0_DMA}, 76 {"LPSS1_F1_PWM1", BIT_LPSS1_F1_PWM1}, 77 {"LPSS1_F2_PWM2", BIT_LPSS1_F2_PWM2}, 78 {"LPSS1_F3_HSUART1", BIT_LPSS1_F3_HSUART1}, 79 {"LPSS1_F4_HSUART2", BIT_LPSS1_F4_HSUART2}, 80 {"LPSS1_F5_SPI", BIT_LPSS1_F5_SPI}, 81 {"LPSS1_F6_Reserved", BIT_LPSS1_F6_XXX}, 82 {"LPSS1_F7_Reserved", BIT_LPSS1_F7_XXX}, 83 {"SCC_EMMC", BIT_SCC_EMMC}, 84 {"SCC_SDIO", BIT_SCC_SDIO}, 85 {"SCC_SDCARD", BIT_SCC_SDCARD}, 86 {"SCC_MIPI", BIT_SCC_MIPI}, 87 {"HDA", BIT_HDA}, 88 {"LPE", BIT_LPE}, 89 {"OTG", BIT_OTG}, 90 {"USH", BIT_USH}, 91 {"GBE", BIT_GBE}, 92 {"SATA", BIT_SATA}, 93 {"USB_EHCI", BIT_USB_EHCI}, 94 {"SEC", BIT_SEC}, 95 {"PCIE_PORT0", BIT_PCIE_PORT0}, 96 {"PCIE_PORT1", BIT_PCIE_PORT1}, 97 {"PCIE_PORT2", BIT_PCIE_PORT2}, 98 {"PCIE_PORT3", BIT_PCIE_PORT3}, 99 {"LPSS2_F0_DMA", BIT_LPSS2_F0_DMA}, 100 {"LPSS2_F1_I2C1", BIT_LPSS2_F1_I2C1}, 101 {"LPSS2_F2_I2C2", BIT_LPSS2_F2_I2C2}, 102 {"LPSS2_F3_I2C3", BIT_LPSS2_F3_I2C3}, 103 {"LPSS2_F3_I2C4", BIT_LPSS2_F4_I2C4}, 104 {"LPSS2_F5_I2C5", BIT_LPSS2_F5_I2C5}, 105 {"LPSS2_F6_I2C6", BIT_LPSS2_F6_I2C6}, 106 {"LPSS2_F7_I2C7", BIT_LPSS2_F7_I2C7}, 107 {}, 108 }; 109 110 static struct pmc_bit_map byt_d3_sts_1_map[] = { 111 {"SMB", BIT_SMB}, 112 {"OTG_SS_PHY", BIT_OTG_SS_PHY}, 113 {"USH_SS_PHY", BIT_USH_SS_PHY}, 114 {"DFX", BIT_DFX}, 115 {}, 116 }; 117 118 static struct pmc_bit_map cht_d3_sts_1_map[] = { 119 {"SMB", BIT_SMB}, 120 {"GMM", BIT_STS_GMM}, 121 {"ISH", BIT_STS_ISH}, 122 {}, 123 }; 124 125 static struct pmc_bit_map cht_func_dis_2_map[] = { 126 {"SMB", BIT_SMB}, 127 {"GMM", BIT_FD_GMM}, 128 {"ISH", BIT_FD_ISH}, 129 {}, 130 }; 131 132 static const struct pmc_bit_map byt_pss_map[] = { 133 {"GBE", PMC_PSS_BIT_GBE}, 134 {"SATA", PMC_PSS_BIT_SATA}, 135 {"HDA", PMC_PSS_BIT_HDA}, 136 {"SEC", PMC_PSS_BIT_SEC}, 137 {"PCIE", PMC_PSS_BIT_PCIE}, 138 {"LPSS", PMC_PSS_BIT_LPSS}, 139 {"LPE", PMC_PSS_BIT_LPE}, 140 {"DFX", PMC_PSS_BIT_DFX}, 141 {"USH_CTRL", PMC_PSS_BIT_USH_CTRL}, 142 {"USH_SUS", PMC_PSS_BIT_USH_SUS}, 143 {"USH_VCCS", PMC_PSS_BIT_USH_VCCS}, 144 {"USH_VCCA", PMC_PSS_BIT_USH_VCCA}, 145 {"OTG_CTRL", PMC_PSS_BIT_OTG_CTRL}, 146 {"OTG_VCCS", PMC_PSS_BIT_OTG_VCCS}, 147 {"OTG_VCCA_CLK", PMC_PSS_BIT_OTG_VCCA_CLK}, 148 {"OTG_VCCA", PMC_PSS_BIT_OTG_VCCA}, 149 {"USB", PMC_PSS_BIT_USB}, 150 {"USB_SUS", PMC_PSS_BIT_USB_SUS}, 151 {}, 152 }; 153 154 static const struct pmc_bit_map cht_pss_map[] = { 155 {"SATA", PMC_PSS_BIT_SATA}, 156 {"HDA", PMC_PSS_BIT_HDA}, 157 {"SEC", PMC_PSS_BIT_SEC}, 158 {"PCIE", PMC_PSS_BIT_PCIE}, 159 {"LPSS", PMC_PSS_BIT_LPSS}, 160 {"LPE", PMC_PSS_BIT_LPE}, 161 {"UFS", PMC_PSS_BIT_CHT_UFS}, 162 {"UXD", PMC_PSS_BIT_CHT_UXD}, 163 {"UXD_FD", PMC_PSS_BIT_CHT_UXD_FD}, 164 {"UX_ENG", PMC_PSS_BIT_CHT_UX_ENG}, 165 {"USB_SUS", PMC_PSS_BIT_CHT_USB_SUS}, 166 {"GMM", PMC_PSS_BIT_CHT_GMM}, 167 {"ISH", PMC_PSS_BIT_CHT_ISH}, 168 {"DFX_MASTER", PMC_PSS_BIT_CHT_DFX_MASTER}, 169 {"DFX_CLUSTER1", PMC_PSS_BIT_CHT_DFX_CLUSTER1}, 170 {"DFX_CLUSTER2", PMC_PSS_BIT_CHT_DFX_CLUSTER2}, 171 {"DFX_CLUSTER3", PMC_PSS_BIT_CHT_DFX_CLUSTER3}, 172 {"DFX_CLUSTER4", PMC_PSS_BIT_CHT_DFX_CLUSTER4}, 173 {"DFX_CLUSTER5", PMC_PSS_BIT_CHT_DFX_CLUSTER5}, 174 {}, 175 }; 176 177 static const struct pmc_reg_map byt_reg_map = { 178 .d3_sts_0 = d3_sts_0_map, 179 .d3_sts_1 = byt_d3_sts_1_map, 180 .func_dis = d3_sts_0_map, 181 .func_dis_2 = byt_d3_sts_1_map, 182 .pss = byt_pss_map, 183 }; 184 185 static const struct pmc_reg_map cht_reg_map = { 186 .d3_sts_0 = d3_sts_0_map, 187 .d3_sts_1 = cht_d3_sts_1_map, 188 .func_dis = d3_sts_0_map, 189 .func_dis_2 = cht_func_dis_2_map, 190 .pss = cht_pss_map, 191 }; 192 193 static const struct pmc_data byt_data = { 194 .map = &byt_reg_map, 195 .clks = byt_clks, 196 }; 197 198 static const struct pmc_data cht_data = { 199 .map = &cht_reg_map, 200 .clks = cht_clks, 201 }; 202 203 static inline u32 pmc_reg_read(struct pmc_dev *pmc, int reg_offset) 204 { 205 return readl(pmc->regmap + reg_offset); 206 } 207 208 static inline void pmc_reg_write(struct pmc_dev *pmc, int reg_offset, u32 val) 209 { 210 writel(val, pmc->regmap + reg_offset); 211 } 212 213 int pmc_atom_read(int offset, u32 *value) 214 { 215 struct pmc_dev *pmc = &pmc_device; 216 217 if (!pmc->init) 218 return -ENODEV; 219 220 *value = pmc_reg_read(pmc, offset); 221 return 0; 222 } 223 EXPORT_SYMBOL_GPL(pmc_atom_read); 224 225 int pmc_atom_write(int offset, u32 value) 226 { 227 struct pmc_dev *pmc = &pmc_device; 228 229 if (!pmc->init) 230 return -ENODEV; 231 232 pmc_reg_write(pmc, offset, value); 233 return 0; 234 } 235 EXPORT_SYMBOL_GPL(pmc_atom_write); 236 237 static void pmc_power_off(void) 238 { 239 u16 pm1_cnt_port; 240 u32 pm1_cnt_value; 241 242 pr_info("Preparing to enter system sleep state S5\n"); 243 244 pm1_cnt_port = acpi_base_addr + PM1_CNT; 245 246 pm1_cnt_value = inl(pm1_cnt_port); 247 pm1_cnt_value &= SLEEP_TYPE_MASK; 248 pm1_cnt_value |= SLEEP_TYPE_S5; 249 pm1_cnt_value |= SLEEP_ENABLE; 250 251 outl(pm1_cnt_value, pm1_cnt_port); 252 } 253 254 static void pmc_hw_reg_setup(struct pmc_dev *pmc) 255 { 256 /* 257 * Disable PMC S0IX_WAKE_EN events coming from: 258 * - LPC clock run 259 * - GPIO_SUS ored dedicated IRQs 260 * - GPIO_SCORE ored dedicated IRQs 261 * - GPIO_SUS shared IRQ 262 * - GPIO_SCORE shared IRQ 263 */ 264 pmc_reg_write(pmc, PMC_S0IX_WAKE_EN, (u32)PMC_WAKE_EN_SETTING); 265 } 266 267 #ifdef CONFIG_DEBUG_FS 268 static void pmc_dev_state_print(struct seq_file *s, int reg_index, 269 u32 sts, const struct pmc_bit_map *sts_map, 270 u32 fd, const struct pmc_bit_map *fd_map) 271 { 272 int offset = PMC_REG_BIT_WIDTH * reg_index; 273 int index; 274 275 for (index = 0; sts_map[index].name; index++) { 276 seq_printf(s, "Dev: %-2d - %-32s\tState: %s [%s]\n", 277 offset + index, sts_map[index].name, 278 fd_map[index].bit_mask & fd ? "Disabled" : "Enabled ", 279 sts_map[index].bit_mask & sts ? "D3" : "D0"); 280 } 281 } 282 283 static int pmc_dev_state_show(struct seq_file *s, void *unused) 284 { 285 struct pmc_dev *pmc = s->private; 286 const struct pmc_reg_map *m = pmc->map; 287 u32 func_dis, func_dis_2; 288 u32 d3_sts_0, d3_sts_1; 289 290 func_dis = pmc_reg_read(pmc, PMC_FUNC_DIS); 291 func_dis_2 = pmc_reg_read(pmc, PMC_FUNC_DIS_2); 292 d3_sts_0 = pmc_reg_read(pmc, PMC_D3_STS_0); 293 d3_sts_1 = pmc_reg_read(pmc, PMC_D3_STS_1); 294 295 /* Low part */ 296 pmc_dev_state_print(s, 0, d3_sts_0, m->d3_sts_0, func_dis, m->func_dis); 297 298 /* High part */ 299 pmc_dev_state_print(s, 1, d3_sts_1, m->d3_sts_1, func_dis_2, m->func_dis_2); 300 301 return 0; 302 } 303 304 DEFINE_SHOW_ATTRIBUTE(pmc_dev_state); 305 306 static int pmc_pss_state_show(struct seq_file *s, void *unused) 307 { 308 struct pmc_dev *pmc = s->private; 309 const struct pmc_bit_map *map = pmc->map->pss; 310 u32 pss = pmc_reg_read(pmc, PMC_PSS); 311 int index; 312 313 for (index = 0; map[index].name; index++) { 314 seq_printf(s, "Island: %-2d - %-32s\tState: %s\n", 315 index, map[index].name, 316 map[index].bit_mask & pss ? "Off" : "On"); 317 } 318 return 0; 319 } 320 321 DEFINE_SHOW_ATTRIBUTE(pmc_pss_state); 322 323 static int pmc_sleep_tmr_show(struct seq_file *s, void *unused) 324 { 325 struct pmc_dev *pmc = s->private; 326 u64 s0ir_tmr, s0i1_tmr, s0i2_tmr, s0i3_tmr, s0_tmr; 327 328 s0ir_tmr = (u64)pmc_reg_read(pmc, PMC_S0IR_TMR) << PMC_TMR_SHIFT; 329 s0i1_tmr = (u64)pmc_reg_read(pmc, PMC_S0I1_TMR) << PMC_TMR_SHIFT; 330 s0i2_tmr = (u64)pmc_reg_read(pmc, PMC_S0I2_TMR) << PMC_TMR_SHIFT; 331 s0i3_tmr = (u64)pmc_reg_read(pmc, PMC_S0I3_TMR) << PMC_TMR_SHIFT; 332 s0_tmr = (u64)pmc_reg_read(pmc, PMC_S0_TMR) << PMC_TMR_SHIFT; 333 334 seq_printf(s, "S0IR Residency:\t%lldus\n", s0ir_tmr); 335 seq_printf(s, "S0I1 Residency:\t%lldus\n", s0i1_tmr); 336 seq_printf(s, "S0I2 Residency:\t%lldus\n", s0i2_tmr); 337 seq_printf(s, "S0I3 Residency:\t%lldus\n", s0i3_tmr); 338 seq_printf(s, "S0 Residency:\t%lldus\n", s0_tmr); 339 return 0; 340 } 341 342 DEFINE_SHOW_ATTRIBUTE(pmc_sleep_tmr); 343 344 static void pmc_dbgfs_register(struct pmc_dev *pmc) 345 { 346 struct dentry *dir; 347 348 dir = debugfs_create_dir("pmc_atom", NULL); 349 350 pmc->dbgfs_dir = dir; 351 352 debugfs_create_file("dev_state", S_IFREG | S_IRUGO, dir, pmc, 353 &pmc_dev_state_fops); 354 debugfs_create_file("pss_state", S_IFREG | S_IRUGO, dir, pmc, 355 &pmc_pss_state_fops); 356 debugfs_create_file("sleep_state", S_IFREG | S_IRUGO, dir, pmc, 357 &pmc_sleep_tmr_fops); 358 } 359 #else 360 static void pmc_dbgfs_register(struct pmc_dev *pmc) 361 { 362 } 363 #endif /* CONFIG_DEBUG_FS */ 364 365 /* 366 * Some systems need one or more of their pmc_plt_clks to be 367 * marked as critical. 368 */ 369 static const struct dmi_system_id critclk_systems[] = { 370 { 371 /* pmc_plt_clk0 is used for an external HSIC USB HUB */ 372 .ident = "MPL CEC1x", 373 .matches = { 374 DMI_MATCH(DMI_SYS_VENDOR, "MPL AG"), 375 DMI_MATCH(DMI_PRODUCT_NAME, "CEC10 Family"), 376 }, 377 }, 378 { 379 /* pmc_plt_clk0 - 3 are used for the 4 ethernet controllers */ 380 .ident = "Lex 3I380D", 381 .matches = { 382 DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"), 383 DMI_MATCH(DMI_PRODUCT_NAME, "3I380D"), 384 }, 385 }, 386 { 387 /* pmc_plt_clk* - are used for ethernet controllers */ 388 .ident = "Lex 2I385SW", 389 .matches = { 390 DMI_MATCH(DMI_SYS_VENDOR, "Lex BayTrail"), 391 DMI_MATCH(DMI_PRODUCT_NAME, "2I385SW"), 392 }, 393 }, 394 { 395 /* pmc_plt_clk* - are used for ethernet controllers */ 396 .ident = "Beckhoff Baytrail", 397 .matches = { 398 DMI_MATCH(DMI_SYS_VENDOR, "Beckhoff Automation"), 399 DMI_MATCH(DMI_PRODUCT_FAMILY, "CBxx63"), 400 }, 401 }, 402 { 403 .ident = "SIMATIC IPC227E", 404 .matches = { 405 DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"), 406 DMI_MATCH(DMI_PRODUCT_VERSION, "6ES7647-8B"), 407 }, 408 }, 409 { 410 .ident = "SIMATIC IPC277E", 411 .matches = { 412 DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"), 413 DMI_MATCH(DMI_PRODUCT_VERSION, "6AV7882-0"), 414 }, 415 }, 416 { 417 .ident = "CONNECT X300", 418 .matches = { 419 DMI_MATCH(DMI_SYS_VENDOR, "SIEMENS AG"), 420 DMI_MATCH(DMI_PRODUCT_VERSION, "A5E45074588"), 421 }, 422 }, 423 424 { /*sentinel*/ } 425 }; 426 427 static int pmc_setup_clks(struct pci_dev *pdev, void __iomem *pmc_regmap, 428 const struct pmc_data *pmc_data) 429 { 430 struct platform_device *clkdev; 431 struct pmc_clk_data *clk_data; 432 const struct dmi_system_id *d = dmi_first_match(critclk_systems); 433 434 clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL); 435 if (!clk_data) 436 return -ENOMEM; 437 438 clk_data->base = pmc_regmap; /* offset is added by client */ 439 clk_data->clks = pmc_data->clks; 440 if (d) { 441 clk_data->critical = true; 442 pr_info("%s critclks quirk enabled\n", d->ident); 443 } 444 445 clkdev = platform_device_register_data(&pdev->dev, "clk-pmc-atom", 446 PLATFORM_DEVID_NONE, 447 clk_data, sizeof(*clk_data)); 448 if (IS_ERR(clkdev)) { 449 kfree(clk_data); 450 return PTR_ERR(clkdev); 451 } 452 453 kfree(clk_data); 454 455 return 0; 456 } 457 458 static int pmc_setup_dev(struct pci_dev *pdev, const struct pci_device_id *ent) 459 { 460 struct pmc_dev *pmc = &pmc_device; 461 const struct pmc_data *data = (struct pmc_data *)ent->driver_data; 462 const struct pmc_reg_map *map = data->map; 463 int ret; 464 465 /* Obtain ACPI base address */ 466 pci_read_config_dword(pdev, ACPI_BASE_ADDR_OFFSET, &acpi_base_addr); 467 acpi_base_addr &= ACPI_BASE_ADDR_MASK; 468 469 /* Install power off function */ 470 if (acpi_base_addr != 0 && pm_power_off == NULL) 471 pm_power_off = pmc_power_off; 472 473 pci_read_config_dword(pdev, PMC_BASE_ADDR_OFFSET, &pmc->base_addr); 474 pmc->base_addr &= PMC_BASE_ADDR_MASK; 475 476 pmc->regmap = ioremap(pmc->base_addr, PMC_MMIO_REG_LEN); 477 if (!pmc->regmap) { 478 dev_err(&pdev->dev, "error: ioremap failed\n"); 479 return -ENOMEM; 480 } 481 482 pmc->map = map; 483 484 /* PMC hardware registers setup */ 485 pmc_hw_reg_setup(pmc); 486 487 pmc_dbgfs_register(pmc); 488 489 /* Register platform clocks - PMC_PLT_CLK [0..5] */ 490 ret = pmc_setup_clks(pdev, pmc->regmap, data); 491 if (ret) 492 dev_warn(&pdev->dev, "platform clocks register failed: %d\n", 493 ret); 494 495 pmc->init = true; 496 return ret; 497 } 498 499 /* 500 * Data for PCI driver interface 501 * 502 * used by pci_match_id() call below. 503 */ 504 static const struct pci_device_id pmc_pci_ids[] = { 505 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_VLV_PMC), (kernel_ulong_t)&byt_data }, 506 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_CHT_PMC), (kernel_ulong_t)&cht_data }, 507 { 0, }, 508 }; 509 510 static int __init pmc_atom_init(void) 511 { 512 struct pci_dev *pdev = NULL; 513 const struct pci_device_id *ent; 514 515 /* We look for our device - PCU PMC 516 * we assume that there is max. one device. 517 * 518 * We can't use plain pci_driver mechanism, 519 * as the device is really a multiple function device, 520 * main driver that binds to the pci_device is lpc_ich 521 * and have to find & bind to the device this way. 522 */ 523 for_each_pci_dev(pdev) { 524 ent = pci_match_id(pmc_pci_ids, pdev); 525 if (ent) 526 return pmc_setup_dev(pdev, ent); 527 } 528 /* Device not found. */ 529 return -ENODEV; 530 } 531 532 device_initcall(pmc_atom_init); 533 534 /* 535 MODULE_AUTHOR("Aubrey Li <aubrey.li@linux.intel.com>"); 536 MODULE_DESCRIPTION("Intel Atom SOC Power Management Controller Interface"); 537 MODULE_LICENSE("GPL v2"); 538 */ 539