Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 1 | /* linux/arch/arm/plat-s3c24xx/pm.c |
| 2 | * |
| 3 | * Copyright (c) 2004,2006 Simtec Electronics |
| 4 | * Ben Dooks <ben@simtec.co.uk> |
| 5 | * |
| 6 | * S3C24XX Power Manager (Suspend-To-RAM) support |
| 7 | * |
| 8 | * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software |
| 22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 23 | * |
| 24 | * Parts based on arch/arm/mach-pxa/pm.c |
| 25 | * |
| 26 | * Thanks to Dimitry Andric for debugging |
| 27 | */ |
| 28 | |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/suspend.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/time.h> |
| 33 | #include <linux/interrupt.h> |
| 34 | #include <linux/crc32.h> |
| 35 | #include <linux/ioport.h> |
| 36 | #include <linux/delay.h> |
| 37 | #include <linux/serial_core.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 38 | #include <linux/io.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 39 | |
| 40 | #include <asm/cacheflush.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 41 | #include <mach/hardware.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 42 | |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 43 | #include <plat/regs-serial.h> |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 44 | #include <mach/regs-clock.h> |
| 45 | #include <mach/regs-gpio.h> |
| 46 | #include <mach/regs-mem.h> |
| 47 | #include <mach/regs-irq.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 48 | |
| 49 | #include <asm/mach/time.h> |
| 50 | |
Ben Dooks | a2b7ba9 | 2008-10-07 22:26:09 +0100 | [diff] [blame] | 51 | #include <plat/pm.h> |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 52 | |
| 53 | /* for external use */ |
| 54 | |
| 55 | unsigned long s3c_pm_flags; |
| 56 | |
| 57 | #define PFX "s3c24xx-pm: " |
| 58 | |
| 59 | static struct sleep_save core_save[] = { |
| 60 | SAVE_ITEM(S3C2410_LOCKTIME), |
| 61 | SAVE_ITEM(S3C2410_CLKCON), |
| 62 | |
| 63 | /* we restore the timings here, with the proviso that the board |
| 64 | * brings the system up in an slower, or equal frequency setting |
| 65 | * to the original system. |
| 66 | * |
| 67 | * if we cannot guarantee this, then things are going to go very |
| 68 | * wrong here, as we modify the refresh and both pll settings. |
| 69 | */ |
| 70 | |
| 71 | SAVE_ITEM(S3C2410_BWSCON), |
| 72 | SAVE_ITEM(S3C2410_BANKCON0), |
| 73 | SAVE_ITEM(S3C2410_BANKCON1), |
| 74 | SAVE_ITEM(S3C2410_BANKCON2), |
| 75 | SAVE_ITEM(S3C2410_BANKCON3), |
| 76 | SAVE_ITEM(S3C2410_BANKCON4), |
| 77 | SAVE_ITEM(S3C2410_BANKCON5), |
| 78 | |
| 79 | SAVE_ITEM(S3C2410_CLKDIVN), |
| 80 | SAVE_ITEM(S3C2410_MPLLCON), |
| 81 | SAVE_ITEM(S3C2410_UPLLCON), |
| 82 | SAVE_ITEM(S3C2410_CLKSLOW), |
| 83 | SAVE_ITEM(S3C2410_REFRESH), |
| 84 | }; |
| 85 | |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 86 | static struct gpio_sleep { |
| 87 | void __iomem *base; |
| 88 | unsigned int gpcon; |
| 89 | unsigned int gpdat; |
| 90 | unsigned int gpup; |
| 91 | } gpio_save[] = { |
| 92 | [0] = { |
| 93 | .base = S3C2410_GPACON, |
| 94 | }, |
| 95 | [1] = { |
| 96 | .base = S3C2410_GPBCON, |
| 97 | }, |
| 98 | [2] = { |
| 99 | .base = S3C2410_GPCCON, |
| 100 | }, |
| 101 | [3] = { |
| 102 | .base = S3C2410_GPDCON, |
| 103 | }, |
| 104 | [4] = { |
| 105 | .base = S3C2410_GPECON, |
| 106 | }, |
| 107 | [5] = { |
| 108 | .base = S3C2410_GPFCON, |
| 109 | }, |
| 110 | [6] = { |
| 111 | .base = S3C2410_GPGCON, |
| 112 | }, |
| 113 | [7] = { |
| 114 | .base = S3C2410_GPHCON, |
| 115 | }, |
| 116 | }; |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 117 | |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 118 | static struct sleep_save misc_save[] = { |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 119 | SAVE_ITEM(S3C2410_DCLKCON), |
| 120 | }; |
| 121 | |
| 122 | #ifdef CONFIG_S3C2410_PM_DEBUG |
| 123 | |
| 124 | #define SAVE_UART(va) \ |
| 125 | SAVE_ITEM((va) + S3C2410_ULCON), \ |
| 126 | SAVE_ITEM((va) + S3C2410_UCON), \ |
| 127 | SAVE_ITEM((va) + S3C2410_UFCON), \ |
| 128 | SAVE_ITEM((va) + S3C2410_UMCON), \ |
| 129 | SAVE_ITEM((va) + S3C2410_UBRDIV) |
| 130 | |
| 131 | static struct sleep_save uart_save[] = { |
| 132 | SAVE_UART(S3C24XX_VA_UART0), |
| 133 | SAVE_UART(S3C24XX_VA_UART1), |
| 134 | #ifndef CONFIG_CPU_S3C2400 |
| 135 | SAVE_UART(S3C24XX_VA_UART2), |
| 136 | #endif |
| 137 | }; |
| 138 | |
| 139 | /* debug |
| 140 | * |
| 141 | * we send the debug to printascii() to allow it to be seen if the |
| 142 | * system never wakes up from the sleep |
| 143 | */ |
| 144 | |
| 145 | extern void printascii(const char *); |
| 146 | |
| 147 | void pm_dbg(const char *fmt, ...) |
| 148 | { |
| 149 | va_list va; |
| 150 | char buff[256]; |
| 151 | |
| 152 | va_start(va, fmt); |
| 153 | vsprintf(buff, fmt, va); |
| 154 | va_end(va); |
| 155 | |
| 156 | printascii(buff); |
| 157 | } |
| 158 | |
| 159 | static void s3c2410_pm_debug_init(void) |
| 160 | { |
| 161 | unsigned long tmp = __raw_readl(S3C2410_CLKCON); |
| 162 | |
| 163 | /* re-start uart clocks */ |
| 164 | tmp |= S3C2410_CLKCON_UART0; |
| 165 | tmp |= S3C2410_CLKCON_UART1; |
| 166 | tmp |= S3C2410_CLKCON_UART2; |
| 167 | |
| 168 | __raw_writel(tmp, S3C2410_CLKCON); |
| 169 | udelay(10); |
| 170 | } |
| 171 | |
| 172 | #define DBG(fmt...) pm_dbg(fmt) |
| 173 | #else |
| 174 | #define DBG(fmt...) printk(KERN_DEBUG fmt) |
| 175 | |
| 176 | #define s3c2410_pm_debug_init() do { } while(0) |
| 177 | |
| 178 | static struct sleep_save uart_save[] = {}; |
| 179 | #endif |
| 180 | |
| 181 | #if defined(CONFIG_S3C2410_PM_CHECK) && CONFIG_S3C2410_PM_CHECK_CHUNKSIZE != 0 |
| 182 | |
| 183 | /* suspend checking code... |
| 184 | * |
| 185 | * this next area does a set of crc checks over all the installed |
| 186 | * memory, so the system can verify if the resume was ok. |
| 187 | * |
| 188 | * CONFIG_S3C2410_PM_CHECK_CHUNKSIZE defines the block-size for the CRC, |
| 189 | * increasing it will mean that the area corrupted will be less easy to spot, |
| 190 | * and reducing the size will cause the CRC save area to grow |
| 191 | */ |
| 192 | |
| 193 | #define CHECK_CHUNKSIZE (CONFIG_S3C2410_PM_CHECK_CHUNKSIZE * 1024) |
| 194 | |
| 195 | static u32 crc_size; /* size needed for the crc block */ |
| 196 | static u32 *crcs; /* allocated over suspend/resume */ |
| 197 | |
| 198 | typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg); |
| 199 | |
| 200 | /* s3c2410_pm_run_res |
| 201 | * |
| 202 | * go thorugh the given resource list, and look for system ram |
| 203 | */ |
| 204 | |
| 205 | static void s3c2410_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg) |
| 206 | { |
| 207 | while (ptr != NULL) { |
| 208 | if (ptr->child != NULL) |
| 209 | s3c2410_pm_run_res(ptr->child, fn, arg); |
| 210 | |
| 211 | if ((ptr->flags & IORESOURCE_MEM) && |
| 212 | strcmp(ptr->name, "System RAM") == 0) { |
| 213 | DBG("Found system RAM at %08lx..%08lx\n", |
| 214 | ptr->start, ptr->end); |
| 215 | arg = (fn)(ptr, arg); |
| 216 | } |
| 217 | |
| 218 | ptr = ptr->sibling; |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | static void s3c2410_pm_run_sysram(run_fn_t fn, u32 *arg) |
| 223 | { |
| 224 | s3c2410_pm_run_res(&iomem_resource, fn, arg); |
| 225 | } |
| 226 | |
| 227 | static u32 *s3c2410_pm_countram(struct resource *res, u32 *val) |
| 228 | { |
| 229 | u32 size = (u32)(res->end - res->start)+1; |
| 230 | |
| 231 | size += CHECK_CHUNKSIZE-1; |
| 232 | size /= CHECK_CHUNKSIZE; |
| 233 | |
| 234 | DBG("Area %08lx..%08lx, %d blocks\n", res->start, res->end, size); |
| 235 | |
| 236 | *val += size * sizeof(u32); |
| 237 | return val; |
| 238 | } |
| 239 | |
| 240 | /* s3c2410_pm_prepare_check |
| 241 | * |
| 242 | * prepare the necessary information for creating the CRCs. This |
| 243 | * must be done before the final save, as it will require memory |
| 244 | * allocating, and thus touching bits of the kernel we do not |
| 245 | * know about. |
| 246 | */ |
| 247 | |
| 248 | static void s3c2410_pm_check_prepare(void) |
| 249 | { |
| 250 | crc_size = 0; |
| 251 | |
| 252 | s3c2410_pm_run_sysram(s3c2410_pm_countram, &crc_size); |
| 253 | |
| 254 | DBG("s3c2410_pm_prepare_check: %u checks needed\n", crc_size); |
| 255 | |
| 256 | crcs = kmalloc(crc_size+4, GFP_KERNEL); |
| 257 | if (crcs == NULL) |
| 258 | printk(KERN_ERR "Cannot allocated CRC save area\n"); |
| 259 | } |
| 260 | |
| 261 | static u32 *s3c2410_pm_makecheck(struct resource *res, u32 *val) |
| 262 | { |
| 263 | unsigned long addr, left; |
| 264 | |
| 265 | for (addr = res->start; addr < res->end; |
| 266 | addr += CHECK_CHUNKSIZE) { |
| 267 | left = res->end - addr; |
| 268 | |
| 269 | if (left > CHECK_CHUNKSIZE) |
| 270 | left = CHECK_CHUNKSIZE; |
| 271 | |
| 272 | *val = crc32_le(~0, phys_to_virt(addr), left); |
| 273 | val++; |
| 274 | } |
| 275 | |
| 276 | return val; |
| 277 | } |
| 278 | |
| 279 | /* s3c2410_pm_check_store |
| 280 | * |
| 281 | * compute the CRC values for the memory blocks before the final |
| 282 | * sleep. |
| 283 | */ |
| 284 | |
| 285 | static void s3c2410_pm_check_store(void) |
| 286 | { |
| 287 | if (crcs != NULL) |
| 288 | s3c2410_pm_run_sysram(s3c2410_pm_makecheck, crcs); |
| 289 | } |
| 290 | |
| 291 | /* in_region |
| 292 | * |
| 293 | * return TRUE if the area defined by ptr..ptr+size contatins the |
| 294 | * what..what+whatsz |
| 295 | */ |
| 296 | |
| 297 | static inline int in_region(void *ptr, int size, void *what, size_t whatsz) |
| 298 | { |
| 299 | if ((what+whatsz) < ptr) |
| 300 | return 0; |
| 301 | |
| 302 | if (what > (ptr+size)) |
| 303 | return 0; |
| 304 | |
| 305 | return 1; |
| 306 | } |
| 307 | |
| 308 | static u32 *s3c2410_pm_runcheck(struct resource *res, u32 *val) |
| 309 | { |
| 310 | void *save_at = phys_to_virt(s3c2410_sleep_save_phys); |
| 311 | unsigned long addr; |
| 312 | unsigned long left; |
| 313 | void *ptr; |
| 314 | u32 calc; |
| 315 | |
| 316 | for (addr = res->start; addr < res->end; |
| 317 | addr += CHECK_CHUNKSIZE) { |
| 318 | left = res->end - addr; |
| 319 | |
| 320 | if (left > CHECK_CHUNKSIZE) |
| 321 | left = CHECK_CHUNKSIZE; |
| 322 | |
| 323 | ptr = phys_to_virt(addr); |
| 324 | |
| 325 | if (in_region(ptr, left, crcs, crc_size)) { |
| 326 | DBG("skipping %08lx, has crc block in\n", addr); |
| 327 | goto skip_check; |
| 328 | } |
| 329 | |
| 330 | if (in_region(ptr, left, save_at, 32*4 )) { |
| 331 | DBG("skipping %08lx, has save block in\n", addr); |
| 332 | goto skip_check; |
| 333 | } |
| 334 | |
| 335 | /* calculate and check the checksum */ |
| 336 | |
| 337 | calc = crc32_le(~0, ptr, left); |
| 338 | if (calc != *val) { |
| 339 | printk(KERN_ERR PFX "Restore CRC error at " |
| 340 | "%08lx (%08x vs %08x)\n", addr, calc, *val); |
| 341 | |
| 342 | DBG("Restore CRC error at %08lx (%08x vs %08x)\n", |
| 343 | addr, calc, *val); |
| 344 | } |
| 345 | |
| 346 | skip_check: |
| 347 | val++; |
| 348 | } |
| 349 | |
| 350 | return val; |
| 351 | } |
| 352 | |
| 353 | /* s3c2410_pm_check_restore |
| 354 | * |
| 355 | * check the CRCs after the restore event and free the memory used |
| 356 | * to hold them |
| 357 | */ |
| 358 | |
| 359 | static void s3c2410_pm_check_restore(void) |
| 360 | { |
| 361 | if (crcs != NULL) { |
| 362 | s3c2410_pm_run_sysram(s3c2410_pm_runcheck, crcs); |
| 363 | kfree(crcs); |
| 364 | crcs = NULL; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | #else |
| 369 | |
| 370 | #define s3c2410_pm_check_prepare() do { } while(0) |
| 371 | #define s3c2410_pm_check_restore() do { } while(0) |
| 372 | #define s3c2410_pm_check_store() do { } while(0) |
| 373 | #endif |
| 374 | |
| 375 | /* helper functions to save and restore register state */ |
| 376 | |
| 377 | void s3c2410_pm_do_save(struct sleep_save *ptr, int count) |
| 378 | { |
| 379 | for (; count > 0; count--, ptr++) { |
| 380 | ptr->val = __raw_readl(ptr->reg); |
| 381 | DBG("saved %p value %08lx\n", ptr->reg, ptr->val); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* s3c2410_pm_do_restore |
| 386 | * |
| 387 | * restore the system from the given list of saved registers |
| 388 | * |
| 389 | * Note, we do not use DBG() in here, as the system may not have |
| 390 | * restore the UARTs state yet |
| 391 | */ |
| 392 | |
| 393 | void s3c2410_pm_do_restore(struct sleep_save *ptr, int count) |
| 394 | { |
| 395 | for (; count > 0; count--, ptr++) { |
| 396 | printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n", |
| 397 | ptr->reg, ptr->val, __raw_readl(ptr->reg)); |
| 398 | |
| 399 | __raw_writel(ptr->val, ptr->reg); |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | /* s3c2410_pm_do_restore_core |
| 404 | * |
| 405 | * similar to s3c2410_pm_do_restore_core |
| 406 | * |
| 407 | * WARNING: Do not put any debug in here that may effect memory or use |
| 408 | * peripherals, as things may be changing! |
| 409 | */ |
| 410 | |
| 411 | static void s3c2410_pm_do_restore_core(struct sleep_save *ptr, int count) |
| 412 | { |
| 413 | for (; count > 0; count--, ptr++) { |
| 414 | __raw_writel(ptr->val, ptr->reg); |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /* s3c2410_pm_show_resume_irqs |
| 419 | * |
| 420 | * print any IRQs asserted at resume time (ie, we woke from) |
| 421 | */ |
| 422 | |
| 423 | static void s3c2410_pm_show_resume_irqs(int start, unsigned long which, |
| 424 | unsigned long mask) |
| 425 | { |
| 426 | int i; |
| 427 | |
| 428 | which &= ~mask; |
| 429 | |
| 430 | for (i = 0; i <= 31; i++) { |
| 431 | if ((which) & (1L<<i)) { |
| 432 | DBG("IRQ %d asserted at resume\n", start+i); |
| 433 | } |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | /* s3c2410_pm_check_resume_pin |
| 438 | * |
| 439 | * check to see if the pin is configured correctly for sleep mode, and |
| 440 | * make any necessary adjustments if it is not |
| 441 | */ |
| 442 | |
| 443 | static void s3c2410_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs) |
| 444 | { |
| 445 | unsigned long irqstate; |
| 446 | unsigned long pinstate; |
| 447 | int irq = s3c2410_gpio_getirq(pin); |
| 448 | |
| 449 | if (irqoffs < 4) |
| 450 | irqstate = s3c_irqwake_intmask & (1L<<irqoffs); |
| 451 | else |
| 452 | irqstate = s3c_irqwake_eintmask & (1L<<irqoffs); |
| 453 | |
| 454 | pinstate = s3c2410_gpio_getcfg(pin); |
| 455 | |
| 456 | if (!irqstate) { |
| 457 | if (pinstate == S3C2410_GPIO_IRQ) |
| 458 | DBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin); |
| 459 | } else { |
| 460 | if (pinstate == S3C2410_GPIO_IRQ) { |
| 461 | DBG("Disabling IRQ %d (pin %d)\n", irq, pin); |
| 462 | s3c2410_gpio_cfgpin(pin, S3C2410_GPIO_INPUT); |
| 463 | } |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | /* s3c2410_pm_configure_extint |
| 468 | * |
| 469 | * configure all external interrupt pins |
| 470 | */ |
| 471 | |
| 472 | static void s3c2410_pm_configure_extint(void) |
| 473 | { |
| 474 | int pin; |
| 475 | |
| 476 | /* for each of the external interrupts (EINT0..EINT15) we |
| 477 | * need to check wether it is an external interrupt source, |
| 478 | * and then configure it as an input if it is not |
| 479 | */ |
| 480 | |
| 481 | for (pin = S3C2410_GPF0; pin <= S3C2410_GPF7; pin++) { |
| 482 | s3c2410_pm_check_resume_pin(pin, pin - S3C2410_GPF0); |
| 483 | } |
| 484 | |
| 485 | for (pin = S3C2410_GPG0; pin <= S3C2410_GPG7; pin++) { |
| 486 | s3c2410_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8); |
| 487 | } |
| 488 | } |
| 489 | |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 490 | /* offsets for CON/DAT/UP registers */ |
| 491 | |
| 492 | #define OFFS_CON (S3C2410_GPACON - S3C2410_GPACON) |
| 493 | #define OFFS_DAT (S3C2410_GPADAT - S3C2410_GPACON) |
| 494 | #define OFFS_UP (S3C2410_GPBUP - S3C2410_GPBCON) |
| 495 | |
| 496 | /* s3c2410_pm_save_gpios() |
| 497 | * |
| 498 | * Save the state of the GPIOs |
| 499 | */ |
| 500 | |
| 501 | static void s3c2410_pm_save_gpios(void) |
| 502 | { |
| 503 | struct gpio_sleep *gps = gpio_save; |
| 504 | unsigned int gpio; |
| 505 | |
| 506 | for (gpio = 0; gpio < ARRAY_SIZE(gpio_save); gpio++, gps++) { |
| 507 | void __iomem *base = gps->base; |
| 508 | |
| 509 | gps->gpcon = __raw_readl(base + OFFS_CON); |
| 510 | gps->gpdat = __raw_readl(base + OFFS_DAT); |
| 511 | |
| 512 | if (gpio > 0) |
| 513 | gps->gpup = __raw_readl(base + OFFS_UP); |
| 514 | |
| 515 | } |
| 516 | } |
| 517 | |
| 518 | /* Test whether the given masked+shifted bits of an GPIO configuration |
| 519 | * are one of the SFN (special function) modes. */ |
| 520 | |
| 521 | static inline int is_sfn(unsigned long con) |
| 522 | { |
| 523 | return (con == 2 || con == 3); |
| 524 | } |
| 525 | |
| 526 | /* Test if the given masked+shifted GPIO configuration is an input */ |
| 527 | |
| 528 | static inline int is_in(unsigned long con) |
| 529 | { |
| 530 | return con == 0; |
| 531 | } |
| 532 | |
| 533 | /* Test if the given masked+shifted GPIO configuration is an output */ |
| 534 | |
| 535 | static inline int is_out(unsigned long con) |
| 536 | { |
| 537 | return con == 1; |
| 538 | } |
| 539 | |
| 540 | /* s3c2410_pm_restore_gpio() |
| 541 | * |
| 542 | * Restore one of the GPIO banks that was saved during suspend. This is |
| 543 | * not as simple as once thought, due to the possibility of glitches |
| 544 | * from the order that the CON and DAT registers are set in. |
| 545 | * |
| 546 | * The three states the pin can be are {IN,OUT,SFN} which gives us 9 |
| 547 | * combinations of changes to check. Three of these, if the pin stays |
| 548 | * in the same configuration can be discounted. This leaves us with |
| 549 | * the following: |
| 550 | * |
| 551 | * { IN => OUT } Change DAT first |
| 552 | * { IN => SFN } Change CON first |
| 553 | * { OUT => SFN } Change CON first, so new data will not glitch |
| 554 | * { OUT => IN } Change CON first, so new data will not glitch |
| 555 | * { SFN => IN } Change CON first |
| 556 | * { SFN => OUT } Change DAT first, so new data will not glitch [1] |
| 557 | * |
| 558 | * We do not currently deal with the UP registers as these control |
| 559 | * weak resistors, so a small delay in change should not need to bring |
| 560 | * these into the calculations. |
| 561 | * |
| 562 | * [1] this assumes that writing to a pin DAT whilst in SFN will set the |
| 563 | * state for when it is next output. |
| 564 | */ |
| 565 | |
| 566 | static void s3c2410_pm_restore_gpio(int index, struct gpio_sleep *gps) |
| 567 | { |
| 568 | void __iomem *base = gps->base; |
| 569 | unsigned long gps_gpcon = gps->gpcon; |
| 570 | unsigned long gps_gpdat = gps->gpdat; |
| 571 | unsigned long old_gpcon; |
| 572 | unsigned long old_gpdat; |
| 573 | unsigned long old_gpup = 0x0; |
| 574 | unsigned long gpcon; |
| 575 | int nr; |
| 576 | |
| 577 | old_gpcon = __raw_readl(base + OFFS_CON); |
| 578 | old_gpdat = __raw_readl(base + OFFS_DAT); |
| 579 | |
| 580 | if (base == S3C2410_GPACON) { |
| 581 | /* GPACON only has one bit per control / data and no PULLUPs. |
| 582 | * GPACON[x] = 0 => Output, 1 => SFN */ |
| 583 | |
| 584 | /* first set all SFN bits to SFN */ |
| 585 | |
| 586 | gpcon = old_gpcon | gps->gpcon; |
| 587 | __raw_writel(gpcon, base + OFFS_CON); |
| 588 | |
| 589 | /* now set all the other bits */ |
| 590 | |
| 591 | __raw_writel(gps_gpdat, base + OFFS_DAT); |
| 592 | __raw_writel(gps_gpcon, base + OFFS_CON); |
| 593 | } else { |
| 594 | unsigned long old, new, mask; |
| 595 | unsigned long change_mask = 0x0; |
| 596 | |
| 597 | old_gpup = __raw_readl(base + OFFS_UP); |
| 598 | |
| 599 | /* Create a change_mask of all the items that need to have |
| 600 | * their CON value changed before their DAT value, so that |
| 601 | * we minimise the work between the two settings. |
| 602 | */ |
| 603 | |
| 604 | for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) { |
| 605 | old = (old_gpcon & mask) >> nr; |
| 606 | new = (gps_gpcon & mask) >> nr; |
| 607 | |
| 608 | /* If there is no change, then skip */ |
| 609 | |
| 610 | if (old == new) |
| 611 | continue; |
| 612 | |
| 613 | /* If both are special function, then skip */ |
| 614 | |
| 615 | if (is_sfn(old) && is_sfn(new)) |
| 616 | continue; |
| 617 | |
| 618 | /* Change is IN => OUT, do not change now */ |
| 619 | |
| 620 | if (is_in(old) && is_out(new)) |
| 621 | continue; |
| 622 | |
| 623 | /* Change is SFN => OUT, do not change now */ |
| 624 | |
| 625 | if (is_sfn(old) && is_out(new)) |
| 626 | continue; |
| 627 | |
| 628 | /* We should now be at the case of IN=>SFN, |
| 629 | * OUT=>SFN, OUT=>IN, SFN=>IN. */ |
| 630 | |
| 631 | change_mask |= mask; |
| 632 | } |
| 633 | |
| 634 | /* Write the new CON settings */ |
| 635 | |
| 636 | gpcon = old_gpcon & ~change_mask; |
| 637 | gpcon |= gps_gpcon & change_mask; |
| 638 | |
| 639 | __raw_writel(gpcon, base + OFFS_CON); |
| 640 | |
| 641 | /* Now change any items that require DAT,CON */ |
| 642 | |
| 643 | __raw_writel(gps_gpdat, base + OFFS_DAT); |
| 644 | __raw_writel(gps_gpcon, base + OFFS_CON); |
| 645 | __raw_writel(gps->gpup, base + OFFS_UP); |
| 646 | } |
| 647 | |
| 648 | DBG("GPIO[%d] CON %08lx => %08lx, DAT %08lx => %08lx\n", |
| 649 | index, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat); |
| 650 | } |
| 651 | |
| 652 | |
| 653 | /** s3c2410_pm_restore_gpios() |
| 654 | * |
| 655 | * Restore the state of the GPIOs |
| 656 | */ |
| 657 | |
| 658 | static void s3c2410_pm_restore_gpios(void) |
| 659 | { |
| 660 | struct gpio_sleep *gps = gpio_save; |
| 661 | int gpio; |
| 662 | |
| 663 | for (gpio = 0; gpio < ARRAY_SIZE(gpio_save); gpio++, gps++) { |
| 664 | s3c2410_pm_restore_gpio(gpio, gps); |
| 665 | } |
| 666 | } |
| 667 | |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 668 | void (*pm_cpu_prep)(void); |
| 669 | void (*pm_cpu_sleep)(void); |
| 670 | |
| 671 | #define any_allowed(mask, allow) (((mask) & (allow)) != (allow)) |
| 672 | |
| 673 | /* s3c2410_pm_enter |
| 674 | * |
| 675 | * central control for sleep/resume process |
| 676 | */ |
| 677 | |
| 678 | static int s3c2410_pm_enter(suspend_state_t state) |
| 679 | { |
| 680 | unsigned long regs_save[16]; |
| 681 | |
| 682 | /* ensure the debug is initialised (if enabled) */ |
| 683 | |
| 684 | s3c2410_pm_debug_init(); |
| 685 | |
| 686 | DBG("s3c2410_pm_enter(%d)\n", state); |
| 687 | |
| 688 | if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) { |
| 689 | printk(KERN_ERR PFX "error: no cpu sleep functions set\n"); |
| 690 | return -EINVAL; |
| 691 | } |
| 692 | |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 693 | /* check if we have anything to wake-up with... bad things seem |
| 694 | * to happen if you suspend with no wakeup (system will often |
| 695 | * require a full power-cycle) |
| 696 | */ |
| 697 | |
| 698 | if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) && |
| 699 | !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) { |
| 700 | printk(KERN_ERR PFX "No sources enabled for wake-up!\n"); |
| 701 | printk(KERN_ERR PFX "Aborting sleep\n"); |
| 702 | return -EINVAL; |
| 703 | } |
| 704 | |
| 705 | /* prepare check area if configured */ |
| 706 | |
| 707 | s3c2410_pm_check_prepare(); |
| 708 | |
| 709 | /* store the physical address of the register recovery block */ |
| 710 | |
| 711 | s3c2410_sleep_save_phys = virt_to_phys(regs_save); |
| 712 | |
| 713 | DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys); |
| 714 | |
| 715 | /* save all necessary core registers not covered by the drivers */ |
| 716 | |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 717 | s3c2410_pm_save_gpios(); |
| 718 | s3c2410_pm_do_save(misc_save, ARRAY_SIZE(misc_save)); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 719 | s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save)); |
| 720 | s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save)); |
| 721 | |
| 722 | /* set the irq configuration for wake */ |
| 723 | |
| 724 | s3c2410_pm_configure_extint(); |
| 725 | |
| 726 | DBG("sleep: irq wakeup masks: %08lx,%08lx\n", |
| 727 | s3c_irqwake_intmask, s3c_irqwake_eintmask); |
| 728 | |
| 729 | __raw_writel(s3c_irqwake_intmask, S3C2410_INTMSK); |
| 730 | __raw_writel(s3c_irqwake_eintmask, S3C2410_EINTMASK); |
| 731 | |
| 732 | /* ack any outstanding external interrupts before we go to sleep */ |
| 733 | |
| 734 | __raw_writel(__raw_readl(S3C2410_EINTPEND), S3C2410_EINTPEND); |
| 735 | __raw_writel(__raw_readl(S3C2410_INTPND), S3C2410_INTPND); |
| 736 | __raw_writel(__raw_readl(S3C2410_SRCPND), S3C2410_SRCPND); |
| 737 | |
Simon Arlott | 6cbdc8c | 2007-05-11 20:40:30 +0100 | [diff] [blame] | 738 | /* call cpu specific preparation */ |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 739 | |
| 740 | pm_cpu_prep(); |
| 741 | |
| 742 | /* flush cache back to ram */ |
| 743 | |
| 744 | flush_cache_all(); |
| 745 | |
| 746 | s3c2410_pm_check_store(); |
| 747 | |
| 748 | /* send the cpu to sleep... */ |
| 749 | |
| 750 | __raw_writel(0x00, S3C2410_CLKCON); /* turn off clocks over sleep */ |
| 751 | |
| 752 | /* s3c2410_cpu_save will also act as our return point from when |
| 753 | * we resume as it saves its own register state, so use the return |
| 754 | * code to differentiate return from save and return from sleep */ |
| 755 | |
| 756 | if (s3c2410_cpu_save(regs_save) == 0) { |
| 757 | flush_cache_all(); |
| 758 | pm_cpu_sleep(); |
| 759 | } |
| 760 | |
| 761 | /* restore the cpu state */ |
| 762 | |
| 763 | cpu_init(); |
| 764 | |
| 765 | /* restore the system state */ |
| 766 | |
| 767 | s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 768 | s3c2410_pm_do_restore(misc_save, ARRAY_SIZE(misc_save)); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 769 | s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save)); |
Ben Dooks | 62feee6 | 2008-01-28 13:01:24 +0100 | [diff] [blame] | 770 | s3c2410_pm_restore_gpios(); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 771 | |
| 772 | s3c2410_pm_debug_init(); |
| 773 | |
| 774 | /* check what irq (if any) restored the system */ |
| 775 | |
| 776 | DBG("post sleep: IRQs 0x%08x, 0x%08x\n", |
| 777 | __raw_readl(S3C2410_SRCPND), |
| 778 | __raw_readl(S3C2410_EINTPEND)); |
| 779 | |
| 780 | s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND), |
| 781 | s3c_irqwake_intmask); |
| 782 | |
| 783 | s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND), |
| 784 | s3c_irqwake_eintmask); |
| 785 | |
| 786 | DBG("post sleep, preparing to return\n"); |
| 787 | |
| 788 | s3c2410_pm_check_restore(); |
| 789 | |
| 790 | /* ok, let's return from sleep */ |
| 791 | |
| 792 | DBG("S3C2410 PM Resume (post-restore)\n"); |
| 793 | return 0; |
| 794 | } |
| 795 | |
Rafael J. Wysocki | 26398a7 | 2007-10-18 03:04:40 -0700 | [diff] [blame] | 796 | static struct platform_suspend_ops s3c2410_pm_ops = { |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 797 | .enter = s3c2410_pm_enter, |
Rafael J. Wysocki | 26398a7 | 2007-10-18 03:04:40 -0700 | [diff] [blame] | 798 | .valid = suspend_valid_only_mem, |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 799 | }; |
| 800 | |
| 801 | /* s3c2410_pm_init |
| 802 | * |
| 803 | * Attach the power management functions. This should be called |
| 804 | * from the board specific initialisation if the board supports |
| 805 | * it. |
| 806 | */ |
| 807 | |
| 808 | int __init s3c2410_pm_init(void) |
| 809 | { |
| 810 | printk("S3C2410 Power Management, (c) 2004 Simtec Electronics\n"); |
| 811 | |
Rafael J. Wysocki | 26398a7 | 2007-10-18 03:04:40 -0700 | [diff] [blame] | 812 | suspend_set_ops(&s3c2410_pm_ops); |
Ben Dooks | a21765a | 2007-02-11 18:31:01 +0100 | [diff] [blame] | 813 | return 0; |
| 814 | } |