Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 1 | /* |
| 2 | * MPC83xx suspend support |
| 3 | * |
| 4 | * Author: Scott Wood <scottwood@freescale.com> |
| 5 | * |
| 6 | * Copyright (c) 2006-2007 Freescale Semiconductor, Inc. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License version 2 as published |
| 10 | * by the Free Software Foundation. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/pm.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/ioport.h> |
| 17 | #include <linux/interrupt.h> |
| 18 | #include <linux/wait.h> |
| 19 | #include <linux/kthread.h> |
| 20 | #include <linux/freezer.h> |
| 21 | #include <linux/suspend.h> |
| 22 | #include <linux/fsl_devices.h> |
| 23 | #include <linux/of_platform.h> |
| 24 | |
| 25 | #include <asm/reg.h> |
| 26 | #include <asm/io.h> |
| 27 | #include <asm/time.h> |
| 28 | #include <asm/mpc6xx.h> |
| 29 | |
| 30 | #include <sysdev/fsl_soc.h> |
| 31 | |
| 32 | #define PMCCR1_NEXT_STATE 0x0C /* Next state for power management */ |
| 33 | #define PMCCR1_NEXT_STATE_SHIFT 2 |
| 34 | #define PMCCR1_CURR_STATE 0x03 /* Current state for power management*/ |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 35 | #define IMMR_SYSCR_OFFSET 0x100 |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 36 | #define IMMR_RCW_OFFSET 0x900 |
| 37 | #define RCW_PCI_HOST 0x80000000 |
| 38 | |
| 39 | void mpc83xx_enter_deep_sleep(phys_addr_t immrbase); |
| 40 | |
| 41 | struct mpc83xx_pmc { |
| 42 | u32 config; |
| 43 | #define PMCCR_DLPEN 2 /* DDR SDRAM low power enable */ |
| 44 | #define PMCCR_SLPEN 1 /* System low power enable */ |
| 45 | |
| 46 | u32 event; |
| 47 | u32 mask; |
| 48 | /* All but PMCI are deep-sleep only */ |
| 49 | #define PMCER_GPIO 0x100 |
| 50 | #define PMCER_PCI 0x080 |
| 51 | #define PMCER_USB 0x040 |
| 52 | #define PMCER_ETSEC1 0x020 |
| 53 | #define PMCER_ETSEC2 0x010 |
| 54 | #define PMCER_TIMER 0x008 |
| 55 | #define PMCER_INT1 0x004 |
| 56 | #define PMCER_INT2 0x002 |
| 57 | #define PMCER_PMCI 0x001 |
| 58 | #define PMCER_ALL 0x1FF |
| 59 | |
| 60 | /* deep-sleep only */ |
| 61 | u32 config1; |
| 62 | #define PMCCR1_USE_STATE 0x80000000 |
| 63 | #define PMCCR1_PME_EN 0x00000080 |
| 64 | #define PMCCR1_ASSERT_PME 0x00000040 |
| 65 | #define PMCCR1_POWER_OFF 0x00000020 |
| 66 | |
| 67 | /* deep-sleep only */ |
| 68 | u32 config2; |
| 69 | }; |
| 70 | |
| 71 | struct mpc83xx_rcw { |
| 72 | u32 rcwlr; |
| 73 | u32 rcwhr; |
| 74 | }; |
| 75 | |
| 76 | struct mpc83xx_clock { |
| 77 | u32 spmr; |
| 78 | u32 occr; |
| 79 | u32 sccr; |
| 80 | }; |
| 81 | |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 82 | struct mpc83xx_syscr { |
| 83 | __be32 sgprl; |
| 84 | __be32 sgprh; |
| 85 | __be32 spridr; |
| 86 | __be32 :32; |
| 87 | __be32 spcr; |
| 88 | __be32 sicrl; |
| 89 | __be32 sicrh; |
| 90 | }; |
| 91 | |
| 92 | struct mpc83xx_saved { |
| 93 | u32 sicrl; |
| 94 | u32 sicrh; |
| 95 | u32 sccr; |
| 96 | }; |
| 97 | |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 98 | struct pmc_type { |
| 99 | int has_deep_sleep; |
| 100 | }; |
| 101 | |
| 102 | static struct of_device *pmc_dev; |
| 103 | static int has_deep_sleep, deep_sleeping; |
| 104 | static int pmc_irq; |
| 105 | static struct mpc83xx_pmc __iomem *pmc_regs; |
| 106 | static struct mpc83xx_clock __iomem *clock_regs; |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 107 | static struct mpc83xx_syscr __iomem *syscr_regs; |
| 108 | static struct mpc83xx_saved saved_regs; |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 109 | static int is_pci_agent, wake_from_pci; |
| 110 | static phys_addr_t immrbase; |
| 111 | static int pci_pm_state; |
| 112 | static DECLARE_WAIT_QUEUE_HEAD(agent_wq); |
| 113 | |
| 114 | int fsl_deep_sleep(void) |
| 115 | { |
| 116 | return deep_sleeping; |
| 117 | } |
Anton Vorontsov | 2e9d546 | 2009-09-23 22:52:38 +0400 | [diff] [blame] | 118 | EXPORT_SYMBOL(fsl_deep_sleep); |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 119 | |
| 120 | static int mpc83xx_change_state(void) |
| 121 | { |
| 122 | u32 curr_state; |
| 123 | u32 reg_cfg1 = in_be32(&pmc_regs->config1); |
| 124 | |
| 125 | if (is_pci_agent) { |
| 126 | pci_pm_state = (reg_cfg1 & PMCCR1_NEXT_STATE) >> |
| 127 | PMCCR1_NEXT_STATE_SHIFT; |
| 128 | curr_state = reg_cfg1 & PMCCR1_CURR_STATE; |
| 129 | |
| 130 | if (curr_state != pci_pm_state) { |
| 131 | reg_cfg1 &= ~PMCCR1_CURR_STATE; |
| 132 | reg_cfg1 |= pci_pm_state; |
| 133 | out_be32(&pmc_regs->config1, reg_cfg1); |
| 134 | |
| 135 | wake_up(&agent_wq); |
| 136 | return 1; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | static irqreturn_t pmc_irq_handler(int irq, void *dev_id) |
| 144 | { |
| 145 | u32 event = in_be32(&pmc_regs->event); |
| 146 | int ret = IRQ_NONE; |
| 147 | |
| 148 | if (mpc83xx_change_state()) |
| 149 | ret = IRQ_HANDLED; |
| 150 | |
| 151 | if (event) { |
| 152 | out_be32(&pmc_regs->event, event); |
| 153 | ret = IRQ_HANDLED; |
| 154 | } |
| 155 | |
| 156 | return ret; |
| 157 | } |
| 158 | |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 159 | static void mpc83xx_suspend_restore_regs(void) |
| 160 | { |
| 161 | out_be32(&syscr_regs->sicrl, saved_regs.sicrl); |
| 162 | out_be32(&syscr_regs->sicrh, saved_regs.sicrh); |
| 163 | out_be32(&clock_regs->sccr, saved_regs.sccr); |
| 164 | } |
| 165 | |
| 166 | static void mpc83xx_suspend_save_regs(void) |
| 167 | { |
| 168 | saved_regs.sicrl = in_be32(&syscr_regs->sicrl); |
| 169 | saved_regs.sicrh = in_be32(&syscr_regs->sicrh); |
| 170 | saved_regs.sccr = in_be32(&clock_regs->sccr); |
| 171 | } |
| 172 | |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 173 | static int mpc83xx_suspend_enter(suspend_state_t state) |
| 174 | { |
| 175 | int ret = -EAGAIN; |
| 176 | |
| 177 | /* Don't go to sleep if there's a race where pci_pm_state changes |
| 178 | * between the agent thread checking it and the PM code disabling |
| 179 | * interrupts. |
| 180 | */ |
| 181 | if (wake_from_pci) { |
| 182 | if (pci_pm_state != (deep_sleeping ? 3 : 2)) |
| 183 | goto out; |
| 184 | |
| 185 | out_be32(&pmc_regs->config1, |
| 186 | in_be32(&pmc_regs->config1) | PMCCR1_PME_EN); |
| 187 | } |
| 188 | |
| 189 | /* Put the system into low-power mode and the RAM |
| 190 | * into self-refresh mode once the core goes to |
| 191 | * sleep. |
| 192 | */ |
| 193 | |
| 194 | out_be32(&pmc_regs->config, PMCCR_SLPEN | PMCCR_DLPEN); |
| 195 | |
| 196 | /* If it has deep sleep (i.e. it's an 831x or compatible), |
| 197 | * disable power to the core upon entering sleep mode. This will |
| 198 | * require going through the boot firmware upon a wakeup event. |
| 199 | */ |
| 200 | |
| 201 | if (deep_sleeping) { |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 202 | mpc83xx_suspend_save_regs(); |
| 203 | |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 204 | out_be32(&pmc_regs->mask, PMCER_ALL); |
| 205 | |
| 206 | out_be32(&pmc_regs->config1, |
| 207 | in_be32(&pmc_regs->config1) | PMCCR1_POWER_OFF); |
| 208 | |
| 209 | enable_kernel_fp(); |
| 210 | |
| 211 | mpc83xx_enter_deep_sleep(immrbase); |
| 212 | |
| 213 | out_be32(&pmc_regs->config1, |
| 214 | in_be32(&pmc_regs->config1) & ~PMCCR1_POWER_OFF); |
| 215 | |
| 216 | out_be32(&pmc_regs->mask, PMCER_PMCI); |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 217 | |
| 218 | mpc83xx_suspend_restore_regs(); |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 219 | } else { |
| 220 | out_be32(&pmc_regs->mask, PMCER_PMCI); |
| 221 | |
| 222 | mpc6xx_enter_standby(); |
| 223 | } |
| 224 | |
| 225 | ret = 0; |
| 226 | |
| 227 | out: |
| 228 | out_be32(&pmc_regs->config1, |
| 229 | in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN); |
| 230 | |
| 231 | return ret; |
| 232 | } |
| 233 | |
Anton Vorontsov | f25c525 | 2009-12-10 21:00:53 +0300 | [diff] [blame] | 234 | static void mpc83xx_suspend_end(void) |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 235 | { |
| 236 | deep_sleeping = 0; |
| 237 | } |
| 238 | |
| 239 | static int mpc83xx_suspend_valid(suspend_state_t state) |
| 240 | { |
| 241 | return state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM; |
| 242 | } |
| 243 | |
| 244 | static int mpc83xx_suspend_begin(suspend_state_t state) |
| 245 | { |
| 246 | switch (state) { |
| 247 | case PM_SUSPEND_STANDBY: |
| 248 | deep_sleeping = 0; |
| 249 | return 0; |
| 250 | |
| 251 | case PM_SUSPEND_MEM: |
| 252 | if (has_deep_sleep) |
| 253 | deep_sleeping = 1; |
| 254 | |
| 255 | return 0; |
| 256 | |
| 257 | default: |
| 258 | return -EINVAL; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | static int agent_thread_fn(void *data) |
| 263 | { |
| 264 | while (1) { |
| 265 | wait_event_interruptible(agent_wq, pci_pm_state >= 2); |
| 266 | try_to_freeze(); |
| 267 | |
| 268 | if (signal_pending(current) || pci_pm_state < 2) |
| 269 | continue; |
| 270 | |
| 271 | /* With a preemptible kernel (or SMP), this could race with |
| 272 | * a userspace-driven suspend request. It's probably best |
| 273 | * to avoid mixing the two with such a configuration (or |
| 274 | * else fix it by adding a mutex to state_store that we can |
| 275 | * synchronize with). |
| 276 | */ |
| 277 | |
| 278 | wake_from_pci = 1; |
| 279 | |
| 280 | pm_suspend(pci_pm_state == 3 ? PM_SUSPEND_MEM : |
| 281 | PM_SUSPEND_STANDBY); |
| 282 | |
| 283 | wake_from_pci = 0; |
| 284 | } |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | static void mpc83xx_set_agent(void) |
| 290 | { |
| 291 | out_be32(&pmc_regs->config1, PMCCR1_USE_STATE); |
| 292 | out_be32(&pmc_regs->mask, PMCER_PMCI); |
| 293 | |
| 294 | kthread_run(agent_thread_fn, NULL, "PCI power mgt"); |
| 295 | } |
| 296 | |
| 297 | static int mpc83xx_is_pci_agent(void) |
| 298 | { |
| 299 | struct mpc83xx_rcw __iomem *rcw_regs; |
| 300 | int ret; |
| 301 | |
| 302 | rcw_regs = ioremap(get_immrbase() + IMMR_RCW_OFFSET, |
| 303 | sizeof(struct mpc83xx_rcw)); |
| 304 | |
| 305 | if (!rcw_regs) |
| 306 | return -ENOMEM; |
| 307 | |
| 308 | ret = !(in_be32(&rcw_regs->rcwhr) & RCW_PCI_HOST); |
| 309 | |
| 310 | iounmap(rcw_regs); |
| 311 | return ret; |
| 312 | } |
| 313 | |
| 314 | static struct platform_suspend_ops mpc83xx_suspend_ops = { |
| 315 | .valid = mpc83xx_suspend_valid, |
| 316 | .begin = mpc83xx_suspend_begin, |
| 317 | .enter = mpc83xx_suspend_enter, |
Anton Vorontsov | f25c525 | 2009-12-10 21:00:53 +0300 | [diff] [blame] | 318 | .end = mpc83xx_suspend_end, |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 319 | }; |
| 320 | |
| 321 | static int pmc_probe(struct of_device *ofdev, |
| 322 | const struct of_device_id *match) |
| 323 | { |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame^] | 324 | struct device_node *np = ofdev->dev.of_node; |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 325 | struct resource res; |
| 326 | struct pmc_type *type = match->data; |
| 327 | int ret = 0; |
| 328 | |
| 329 | if (!of_device_is_available(np)) |
| 330 | return -ENODEV; |
| 331 | |
| 332 | has_deep_sleep = type->has_deep_sleep; |
| 333 | immrbase = get_immrbase(); |
| 334 | pmc_dev = ofdev; |
| 335 | |
| 336 | is_pci_agent = mpc83xx_is_pci_agent(); |
| 337 | if (is_pci_agent < 0) |
| 338 | return is_pci_agent; |
| 339 | |
| 340 | ret = of_address_to_resource(np, 0, &res); |
| 341 | if (ret) |
| 342 | return -ENODEV; |
| 343 | |
| 344 | pmc_irq = irq_of_parse_and_map(np, 0); |
| 345 | if (pmc_irq != NO_IRQ) { |
| 346 | ret = request_irq(pmc_irq, pmc_irq_handler, IRQF_SHARED, |
| 347 | "pmc", ofdev); |
| 348 | |
| 349 | if (ret) |
| 350 | return -EBUSY; |
| 351 | } |
| 352 | |
| 353 | pmc_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc)); |
| 354 | |
| 355 | if (!pmc_regs) { |
| 356 | ret = -ENOMEM; |
| 357 | goto out; |
| 358 | } |
| 359 | |
| 360 | ret = of_address_to_resource(np, 1, &res); |
| 361 | if (ret) { |
| 362 | ret = -ENODEV; |
| 363 | goto out_pmc; |
| 364 | } |
| 365 | |
| 366 | clock_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc)); |
| 367 | |
| 368 | if (!clock_regs) { |
| 369 | ret = -ENOMEM; |
| 370 | goto out_pmc; |
| 371 | } |
| 372 | |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 373 | if (has_deep_sleep) { |
| 374 | syscr_regs = ioremap(immrbase + IMMR_SYSCR_OFFSET, |
| 375 | sizeof(*syscr_regs)); |
| 376 | if (!syscr_regs) { |
| 377 | ret = -ENOMEM; |
| 378 | goto out_syscr; |
| 379 | } |
| 380 | } |
| 381 | |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 382 | if (is_pci_agent) |
| 383 | mpc83xx_set_agent(); |
| 384 | |
| 385 | suspend_set_ops(&mpc83xx_suspend_ops); |
| 386 | return 0; |
| 387 | |
Anton Vorontsov | 87faaab | 2009-12-10 21:00:56 +0300 | [diff] [blame] | 388 | out_syscr: |
| 389 | iounmap(clock_regs); |
Scott Wood | d49747b | 2007-10-09 12:37:13 -0500 | [diff] [blame] | 390 | out_pmc: |
| 391 | iounmap(pmc_regs); |
| 392 | out: |
| 393 | if (pmc_irq != NO_IRQ) |
| 394 | free_irq(pmc_irq, ofdev); |
| 395 | |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | static int pmc_remove(struct of_device *ofdev) |
| 400 | { |
| 401 | return -EPERM; |
| 402 | }; |
| 403 | |
| 404 | static struct pmc_type pmc_types[] = { |
| 405 | { |
| 406 | .has_deep_sleep = 1, |
| 407 | }, |
| 408 | { |
| 409 | .has_deep_sleep = 0, |
| 410 | } |
| 411 | }; |
| 412 | |
| 413 | static struct of_device_id pmc_match[] = { |
| 414 | { |
| 415 | .compatible = "fsl,mpc8313-pmc", |
| 416 | .data = &pmc_types[0], |
| 417 | }, |
| 418 | { |
| 419 | .compatible = "fsl,mpc8349-pmc", |
| 420 | .data = &pmc_types[1], |
| 421 | }, |
| 422 | {} |
| 423 | }; |
| 424 | |
| 425 | static struct of_platform_driver pmc_driver = { |
| 426 | .name = "mpc83xx-pmc", |
| 427 | .match_table = pmc_match, |
| 428 | .probe = pmc_probe, |
| 429 | .remove = pmc_remove |
| 430 | }; |
| 431 | |
| 432 | static int pmc_init(void) |
| 433 | { |
| 434 | return of_register_platform_driver(&pmc_driver); |
| 435 | } |
| 436 | |
| 437 | module_init(pmc_init); |