1 /* linux/arch/arm/mach-s3c2410/pm.c
3 * Copyright (c) 2004,2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * S3C24XX Power Manager (Suspend-To-RAM) support
8 * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
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.
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.
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
24 * Parts based on arch/arm/mach-pxa/pm.c
26 * Thanks to Dimitry Andric for debugging
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>
38 #include <asm/cacheflush.h>
39 #include <asm/hardware.h>
42 #include <asm/arch/regs-serial.h>
43 #include <asm/arch/regs-clock.h>
44 #include <asm/arch/regs-gpio.h>
45 #include <asm/arch/regs-mem.h>
46 #include <asm/arch/regs-irq.h>
48 #include <asm/mach/time.h>
52 /* for external use */
54 unsigned long s3c_pm_flags;
56 #define PFX "s3c24xx-pm: "
58 static struct sleep_save core_save[] = {
59 SAVE_ITEM(S3C2410_LOCKTIME),
60 SAVE_ITEM(S3C2410_CLKCON),
62 /* we restore the timings here, with the proviso that the board
63 * brings the system up in an slower, or equal frequency setting
64 * to the original system.
66 * if we cannot guarantee this, then things are going to go very
67 * wrong here, as we modify the refresh and both pll settings.
70 SAVE_ITEM(S3C2410_BWSCON),
71 SAVE_ITEM(S3C2410_BANKCON0),
72 SAVE_ITEM(S3C2410_BANKCON1),
73 SAVE_ITEM(S3C2410_BANKCON2),
74 SAVE_ITEM(S3C2410_BANKCON3),
75 SAVE_ITEM(S3C2410_BANKCON4),
76 SAVE_ITEM(S3C2410_BANKCON5),
78 SAVE_ITEM(S3C2410_CLKDIVN),
79 SAVE_ITEM(S3C2410_MPLLCON),
80 SAVE_ITEM(S3C2410_UPLLCON),
81 SAVE_ITEM(S3C2410_CLKSLOW),
82 SAVE_ITEM(S3C2410_REFRESH),
85 static struct sleep_save gpio_save[] = {
86 SAVE_ITEM(S3C2410_GPACON),
87 SAVE_ITEM(S3C2410_GPADAT),
89 SAVE_ITEM(S3C2410_GPBCON),
90 SAVE_ITEM(S3C2410_GPBDAT),
91 SAVE_ITEM(S3C2410_GPBUP),
93 SAVE_ITEM(S3C2410_GPCCON),
94 SAVE_ITEM(S3C2410_GPCDAT),
95 SAVE_ITEM(S3C2410_GPCUP),
97 SAVE_ITEM(S3C2410_GPDCON),
98 SAVE_ITEM(S3C2410_GPDDAT),
99 SAVE_ITEM(S3C2410_GPDUP),
101 SAVE_ITEM(S3C2410_GPECON),
102 SAVE_ITEM(S3C2410_GPEDAT),
103 SAVE_ITEM(S3C2410_GPEUP),
105 SAVE_ITEM(S3C2410_GPFCON),
106 SAVE_ITEM(S3C2410_GPFDAT),
107 SAVE_ITEM(S3C2410_GPFUP),
109 SAVE_ITEM(S3C2410_GPGCON),
110 SAVE_ITEM(S3C2410_GPGDAT),
111 SAVE_ITEM(S3C2410_GPGUP),
113 SAVE_ITEM(S3C2410_GPHCON),
114 SAVE_ITEM(S3C2410_GPHDAT),
115 SAVE_ITEM(S3C2410_GPHUP),
117 SAVE_ITEM(S3C2410_DCLKCON),
120 #ifdef CONFIG_S3C2410_PM_DEBUG
122 #define SAVE_UART(va) \
123 SAVE_ITEM((va) + S3C2410_ULCON), \
124 SAVE_ITEM((va) + S3C2410_UCON), \
125 SAVE_ITEM((va) + S3C2410_UFCON), \
126 SAVE_ITEM((va) + S3C2410_UMCON), \
127 SAVE_ITEM((va) + S3C2410_UBRDIV)
129 static struct sleep_save uart_save[] = {
130 SAVE_UART(S3C24XX_VA_UART0),
131 SAVE_UART(S3C24XX_VA_UART1),
132 #ifndef CONFIG_CPU_S3C2400
133 SAVE_UART(S3C24XX_VA_UART2),
139 * we send the debug to printascii() to allow it to be seen if the
140 * system never wakes up from the sleep
143 extern void printascii(const char *);
145 void pm_dbg(const char *fmt, ...)
151 vsprintf(buff, fmt, va);
157 static void s3c2410_pm_debug_init(void)
159 unsigned long tmp = __raw_readl(S3C2410_CLKCON);
161 /* re-start uart clocks */
162 tmp |= S3C2410_CLKCON_UART0;
163 tmp |= S3C2410_CLKCON_UART1;
164 tmp |= S3C2410_CLKCON_UART2;
166 __raw_writel(tmp, S3C2410_CLKCON);
170 #define DBG(fmt...) pm_dbg(fmt)
172 #define DBG(fmt...) printk(KERN_DEBUG fmt)
174 #define s3c2410_pm_debug_init() do { } while(0)
176 static struct sleep_save uart_save[] = {};
179 #if defined(CONFIG_S3C2410_PM_CHECK) && CONFIG_S3C2410_PM_CHECK_CHUNKSIZE != 0
181 /* suspend checking code...
183 * this next area does a set of crc checks over all the installed
184 * memory, so the system can verify if the resume was ok.
186 * CONFIG_S3C2410_PM_CHECK_CHUNKSIZE defines the block-size for the CRC,
187 * increasing it will mean that the area corrupted will be less easy to spot,
188 * and reducing the size will cause the CRC save area to grow
191 #define CHECK_CHUNKSIZE (CONFIG_S3C2410_PM_CHECK_CHUNKSIZE * 1024)
193 static u32 crc_size; /* size needed for the crc block */
194 static u32 *crcs; /* allocated over suspend/resume */
196 typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg);
198 /* s3c2410_pm_run_res
200 * go thorugh the given resource list, and look for system ram
203 static void s3c2410_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg)
205 while (ptr != NULL) {
206 if (ptr->child != NULL)
207 s3c2410_pm_run_res(ptr->child, fn, arg);
209 if ((ptr->flags & IORESOURCE_MEM) &&
210 strcmp(ptr->name, "System RAM") == 0) {
211 DBG("Found system RAM at %08lx..%08lx\n",
212 ptr->start, ptr->end);
213 arg = (fn)(ptr, arg);
220 static void s3c2410_pm_run_sysram(run_fn_t fn, u32 *arg)
222 s3c2410_pm_run_res(&iomem_resource, fn, arg);
225 static u32 *s3c2410_pm_countram(struct resource *res, u32 *val)
227 u32 size = (u32)(res->end - res->start)+1;
229 size += CHECK_CHUNKSIZE-1;
230 size /= CHECK_CHUNKSIZE;
232 DBG("Area %08lx..%08lx, %d blocks\n", res->start, res->end, size);
234 *val += size * sizeof(u32);
238 /* s3c2410_pm_prepare_check
240 * prepare the necessary information for creating the CRCs. This
241 * must be done before the final save, as it will require memory
242 * allocating, and thus touching bits of the kernel we do not
246 static void s3c2410_pm_check_prepare(void)
250 s3c2410_pm_run_sysram(s3c2410_pm_countram, &crc_size);
252 DBG("s3c2410_pm_prepare_check: %u checks needed\n", crc_size);
254 crcs = kmalloc(crc_size+4, GFP_KERNEL);
256 printk(KERN_ERR "Cannot allocated CRC save area\n");
259 static u32 *s3c2410_pm_makecheck(struct resource *res, u32 *val)
261 unsigned long addr, left;
263 for (addr = res->start; addr < res->end;
264 addr += CHECK_CHUNKSIZE) {
265 left = res->end - addr;
267 if (left > CHECK_CHUNKSIZE)
268 left = CHECK_CHUNKSIZE;
270 *val = crc32_le(~0, phys_to_virt(addr), left);
277 /* s3c2410_pm_check_store
279 * compute the CRC values for the memory blocks before the final
283 static void s3c2410_pm_check_store(void)
286 s3c2410_pm_run_sysram(s3c2410_pm_makecheck, crcs);
291 * return TRUE if the area defined by ptr..ptr+size contatins the
295 static inline int in_region(void *ptr, int size, void *what, size_t whatsz)
297 if ((what+whatsz) < ptr)
300 if (what > (ptr+size))
306 static u32 *s3c2410_pm_runcheck(struct resource *res, u32 *val)
308 void *save_at = phys_to_virt(s3c2410_sleep_save_phys);
314 for (addr = res->start; addr < res->end;
315 addr += CHECK_CHUNKSIZE) {
316 left = res->end - addr;
318 if (left > CHECK_CHUNKSIZE)
319 left = CHECK_CHUNKSIZE;
321 ptr = phys_to_virt(addr);
323 if (in_region(ptr, left, crcs, crc_size)) {
324 DBG("skipping %08lx, has crc block in\n", addr);
328 if (in_region(ptr, left, save_at, 32*4 )) {
329 DBG("skipping %08lx, has save block in\n", addr);
333 /* calculate and check the checksum */
335 calc = crc32_le(~0, ptr, left);
337 printk(KERN_ERR PFX "Restore CRC error at "
338 "%08lx (%08x vs %08x)\n", addr, calc, *val);
340 DBG("Restore CRC error at %08lx (%08x vs %08x)\n",
351 /* s3c2410_pm_check_restore
353 * check the CRCs after the restore event and free the memory used
357 static void s3c2410_pm_check_restore(void)
360 s3c2410_pm_run_sysram(s3c2410_pm_runcheck, crcs);
368 #define s3c2410_pm_check_prepare() do { } while(0)
369 #define s3c2410_pm_check_restore() do { } while(0)
370 #define s3c2410_pm_check_store() do { } while(0)
373 /* helper functions to save and restore register state */
375 void s3c2410_pm_do_save(struct sleep_save *ptr, int count)
377 for (; count > 0; count--, ptr++) {
378 ptr->val = __raw_readl(ptr->reg);
379 DBG("saved %p value %08lx\n", ptr->reg, ptr->val);
383 /* s3c2410_pm_do_restore
385 * restore the system from the given list of saved registers
387 * Note, we do not use DBG() in here, as the system may not have
388 * restore the UARTs state yet
391 void s3c2410_pm_do_restore(struct sleep_save *ptr, int count)
393 for (; count > 0; count--, ptr++) {
394 printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
395 ptr->reg, ptr->val, __raw_readl(ptr->reg));
397 __raw_writel(ptr->val, ptr->reg);
401 /* s3c2410_pm_do_restore_core
403 * similar to s3c2410_pm_do_restore_core
405 * WARNING: Do not put any debug in here that may effect memory or use
406 * peripherals, as things may be changing!
409 static void s3c2410_pm_do_restore_core(struct sleep_save *ptr, int count)
411 for (; count > 0; count--, ptr++) {
412 __raw_writel(ptr->val, ptr->reg);
416 /* s3c2410_pm_show_resume_irqs
418 * print any IRQs asserted at resume time (ie, we woke from)
421 static void s3c2410_pm_show_resume_irqs(int start, unsigned long which,
428 for (i = 0; i <= 31; i++) {
429 if ((which) & (1L<<i)) {
430 DBG("IRQ %d asserted at resume\n", start+i);
435 /* s3c2410_pm_check_resume_pin
437 * check to see if the pin is configured correctly for sleep mode, and
438 * make any necessary adjustments if it is not
441 static void s3c2410_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
443 unsigned long irqstate;
444 unsigned long pinstate;
445 int irq = s3c2410_gpio_getirq(pin);
448 irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
450 irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
452 pinstate = s3c2410_gpio_getcfg(pin);
453 pinstate >>= S3C2410_GPIO_OFFSET(pin)*2;
456 if (pinstate == 0x02)
457 DBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin);
459 if (pinstate == 0x02) {
460 DBG("Disabling IRQ %d (pin %d)\n", irq, pin);
461 s3c2410_gpio_cfgpin(pin, 0x00);
466 /* s3c2410_pm_configure_extint
468 * configure all external interrupt pins
471 static void s3c2410_pm_configure_extint(void)
475 /* for each of the external interrupts (EINT0..EINT15) we
476 * need to check wether it is an external interrupt source,
477 * and then configure it as an input if it is not
480 for (pin = S3C2410_GPF0; pin <= S3C2410_GPF7; pin++) {
481 s3c2410_pm_check_resume_pin(pin, pin - S3C2410_GPF0);
484 for (pin = S3C2410_GPG0; pin <= S3C2410_GPG7; pin++) {
485 s3c2410_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8);
489 void (*pm_cpu_prep)(void);
490 void (*pm_cpu_sleep)(void);
492 #define any_allowed(mask, allow) (((mask) & (allow)) != (allow))
496 * central control for sleep/resume process
499 static int s3c2410_pm_enter(suspend_state_t state)
501 unsigned long regs_save[16];
503 /* ensure the debug is initialised (if enabled) */
505 s3c2410_pm_debug_init();
507 DBG("s3c2410_pm_enter(%d)\n", state);
509 if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
510 printk(KERN_ERR PFX "error: no cpu sleep functions set\n");
514 if (state != PM_SUSPEND_MEM) {
515 printk(KERN_ERR PFX "error: only PM_SUSPEND_MEM supported\n");
519 /* check if we have anything to wake-up with... bad things seem
520 * to happen if you suspend with no wakeup (system will often
521 * require a full power-cycle)
524 if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
525 !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
526 printk(KERN_ERR PFX "No sources enabled for wake-up!\n");
527 printk(KERN_ERR PFX "Aborting sleep\n");
531 /* prepare check area if configured */
533 s3c2410_pm_check_prepare();
535 /* store the physical address of the register recovery block */
537 s3c2410_sleep_save_phys = virt_to_phys(regs_save);
539 DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys);
541 /* save all necessary core registers not covered by the drivers */
543 s3c2410_pm_do_save(gpio_save, ARRAY_SIZE(gpio_save));
544 s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save));
545 s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save));
547 /* set the irq configuration for wake */
549 s3c2410_pm_configure_extint();
551 DBG("sleep: irq wakeup masks: %08lx,%08lx\n",
552 s3c_irqwake_intmask, s3c_irqwake_eintmask);
554 __raw_writel(s3c_irqwake_intmask, S3C2410_INTMSK);
555 __raw_writel(s3c_irqwake_eintmask, S3C2410_EINTMASK);
557 /* ack any outstanding external interrupts before we go to sleep */
559 __raw_writel(__raw_readl(S3C2410_EINTPEND), S3C2410_EINTPEND);
560 __raw_writel(__raw_readl(S3C2410_INTPND), S3C2410_INTPND);
561 __raw_writel(__raw_readl(S3C2410_SRCPND), S3C2410_SRCPND);
563 /* call cpu specific preperation */
567 /* flush cache back to ram */
571 s3c2410_pm_check_store();
573 /* send the cpu to sleep... */
575 __raw_writel(0x00, S3C2410_CLKCON); /* turn off clocks over sleep */
577 /* s3c2410_cpu_save will also act as our return point from when
578 * we resume as it saves its own register state, so use the return
579 * code to differentiate return from save and return from sleep */
581 if (s3c2410_cpu_save(regs_save) == 0) {
586 /* restore the cpu state */
590 /* restore the system state */
592 s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
593 s3c2410_pm_do_restore(gpio_save, ARRAY_SIZE(gpio_save));
594 s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save));
596 s3c2410_pm_debug_init();
598 /* check what irq (if any) restored the system */
600 DBG("post sleep: IRQs 0x%08x, 0x%08x\n",
601 __raw_readl(S3C2410_SRCPND),
602 __raw_readl(S3C2410_EINTPEND));
604 s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND),
605 s3c_irqwake_intmask);
607 s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND),
608 s3c_irqwake_eintmask);
610 DBG("post sleep, preparing to return\n");
612 s3c2410_pm_check_restore();
614 /* ok, let's return from sleep */
616 DBG("S3C2410 PM Resume (post-restore)\n");
621 * Called after processes are frozen, but before we shut down devices.
623 static int s3c2410_pm_prepare(suspend_state_t state)
629 * Called after devices are re-setup, but before processes are thawed.
631 static int s3c2410_pm_finish(suspend_state_t state)
637 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
639 static struct pm_ops s3c2410_pm_ops = {
640 .pm_disk_mode = PM_DISK_FIRMWARE,
641 .prepare = s3c2410_pm_prepare,
642 .enter = s3c2410_pm_enter,
643 .finish = s3c2410_pm_finish,
648 * Attach the power management functions. This should be called
649 * from the board specific initialisation if the board supports
653 int __init s3c2410_pm_init(void)
655 printk("S3C2410 Power Management, (c) 2004 Simtec Electronics\n");
657 pm_set_ops(&s3c2410_pm_ops);