1 files changed, 659 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c24xx/pm.c b/arch/arm/plat-s3c24xx/pm.c
new file mode 100644
index 000000000000..ecf68d611904
--- /dev/null
+++ b/arch/arm/plat-s3c24xx/pm.c
@@ -0,0 +1,659 @@
+/* linux/arch/arm/plat-s3c24xx/pm.c
+ *
+ * Copyright (c) 2004,2006 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX Power Manager (Suspend-To-RAM) support
+ *
+ * See Documentation/arm/Samsung-S3C24XX/Suspend.txt for more information
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Parts based on arch/arm/mach-pxa/pm.c
+ *
+ * Thanks to Dimitry Andric for debugging
+*/
+
+#include <linux/init.h>
+#include <linux/suspend.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/interrupt.h>
+#include <linux/crc32.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/serial_core.h>
+
+#include <asm/cacheflush.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+
+#include <asm/arch/regs-serial.h>
+#include <asm/arch/regs-clock.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-mem.h>
+#include <asm/arch/regs-irq.h>
+
+#include <asm/mach/time.h>
+
+#include <asm/plat-s3c24xx/pm.h>
+
+/* for external use */
+
+unsigned long s3c_pm_flags;
+
+#define PFX "s3c24xx-pm: "
+
+static struct sleep_save core_save[] = {
+        SAVE_ITEM(S3C2410_LOCKTIME),
+        SAVE_ITEM(S3C2410_CLKCON),
+
+        /* we restore the timings here, with the proviso that the board
+         * brings the system up in an slower, or equal frequency setting
+         * to the original system.
+         *
+         * if we cannot guarantee this, then things are going to go very
+         * wrong here, as we modify the refresh and both pll settings.
+         */
+
+        SAVE_ITEM(S3C2410_BWSCON),
+        SAVE_ITEM(S3C2410_BANKCON0),
+        SAVE_ITEM(S3C2410_BANKCON1),
+        SAVE_ITEM(S3C2410_BANKCON2),
+        SAVE_ITEM(S3C2410_BANKCON3),
+        SAVE_ITEM(S3C2410_BANKCON4),
+        SAVE_ITEM(S3C2410_BANKCON5),
+
+        SAVE_ITEM(S3C2410_CLKDIVN),
+        SAVE_ITEM(S3C2410_MPLLCON),
+        SAVE_ITEM(S3C2410_UPLLCON),
+        SAVE_ITEM(S3C2410_CLKSLOW),
+        SAVE_ITEM(S3C2410_REFRESH),
+};
+
+static struct sleep_save gpio_save[] = {
+        SAVE_ITEM(S3C2410_GPACON),
+        SAVE_ITEM(S3C2410_GPADAT),
+
+        SAVE_ITEM(S3C2410_GPBCON),
+        SAVE_ITEM(S3C2410_GPBDAT),
+        SAVE_ITEM(S3C2410_GPBUP),
+
+        SAVE_ITEM(S3C2410_GPCCON),
+        SAVE_ITEM(S3C2410_GPCDAT),
+        SAVE_ITEM(S3C2410_GPCUP),
+
+        SAVE_ITEM(S3C2410_GPDCON),
+        SAVE_ITEM(S3C2410_GPDDAT),
+        SAVE_ITEM(S3C2410_GPDUP),
+
+        SAVE_ITEM(S3C2410_GPECON),
+        SAVE_ITEM(S3C2410_GPEDAT),
+        SAVE_ITEM(S3C2410_GPEUP),
+
+        SAVE_ITEM(S3C2410_GPFCON),
+        SAVE_ITEM(S3C2410_GPFDAT),
+        SAVE_ITEM(S3C2410_GPFUP),
+
+        SAVE_ITEM(S3C2410_GPGCON),
+        SAVE_ITEM(S3C2410_GPGDAT),
+        SAVE_ITEM(S3C2410_GPGUP),
+
+        SAVE_ITEM(S3C2410_GPHCON),
+        SAVE_ITEM(S3C2410_GPHDAT),
+        SAVE_ITEM(S3C2410_GPHUP),
+
+        SAVE_ITEM(S3C2410_DCLKCON),
+};
+
+#ifdef CONFIG_S3C2410_PM_DEBUG
+
+#define SAVE_UART(va) \
+        SAVE_ITEM((va) + S3C2410_ULCON), \
+        SAVE_ITEM((va) + S3C2410_UCON), \
+        SAVE_ITEM((va) + S3C2410_UFCON), \
+        SAVE_ITEM((va) + S3C2410_UMCON), \
+        SAVE_ITEM((va) + S3C2410_UBRDIV)
+
+static struct sleep_save uart_save[] = {
+        SAVE_UART(S3C24XX_VA_UART0),
+        SAVE_UART(S3C24XX_VA_UART1),
+#ifndef CONFIG_CPU_S3C2400
+        SAVE_UART(S3C24XX_VA_UART2),
+#endif
+};
+
+/* debug
+ *
+ * we send the debug to printascii() to allow it to be seen if the
+ * system never wakes up from the sleep
+*/
+
+extern void printascii(const char *);
+
+void pm_dbg(const char *fmt, ...)
+{
+        va_list va;
+        char buff[256];
+
+        va_start(va, fmt);
+        vsprintf(buff, fmt, va);
+        va_end(va);
+
+        printascii(buff);
+}
+
+static void s3c2410_pm_debug_init(void)
+{
+        unsigned long tmp = __raw_readl(S3C2410_CLKCON);
+
+        /* re-start uart clocks */
+        tmp |= S3C2410_CLKCON_UART0;
+        tmp |= S3C2410_CLKCON_UART1;
+        tmp |= S3C2410_CLKCON_UART2;
+
+        __raw_writel(tmp, S3C2410_CLKCON);
+        udelay(10);
+}
+
+#define DBG(fmt...) pm_dbg(fmt)
+#else
+#define DBG(fmt...) printk(KERN_DEBUG fmt)
+
+#define s3c2410_pm_debug_init() do { } while(0)
+
+static struct sleep_save uart_save[] = {};
+#endif
+
+#if defined(CONFIG_S3C2410_PM_CHECK) && CONFIG_S3C2410_PM_CHECK_CHUNKSIZE != 0
+
+/* suspend checking code...
+ *
+ * this next area does a set of crc checks over all the installed
+ * memory, so the system can verify if the resume was ok.
+ *
+ * CONFIG_S3C2410_PM_CHECK_CHUNKSIZE defines the block-size for the CRC,
+ * increasing it will mean that the area corrupted will be less easy to spot,
+ * and reducing the size will cause the CRC save area to grow
+*/
+
+#define CHECK_CHUNKSIZE (CONFIG_S3C2410_PM_CHECK_CHUNKSIZE * 1024)
+
+static u32 crc_size;    /* size needed for the crc block */
+static u32 *crcs;       /* allocated over suspend/resume */
+
+typedef u32 *(run_fn_t)(struct resource *ptr, u32 *arg);
+
+/* s3c2410_pm_run_res
+ *
+ * go thorugh the given resource list, and look for system ram
+*/
+
+static void s3c2410_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg)
+{
+        while (ptr != NULL) {
+                if (ptr->child != NULL)
+                        s3c2410_pm_run_res(ptr->child, fn, arg);
+
+                if ((ptr->flags & IORESOURCE_MEM) &&
+                    strcmp(ptr->name, "System RAM") == 0) {
+                        DBG("Found system RAM at %08lx..%08lx\n",
+                            ptr->start, ptr->end);
+                        arg = (fn)(ptr, arg);
+                }
+
+                ptr = ptr->sibling;
+        }
+}
+
+static void s3c2410_pm_run_sysram(run_fn_t fn, u32 *arg)
+{
+        s3c2410_pm_run_res(&iomem_resource, fn, arg);
+}
+
+static u32 *s3c2410_pm_countram(struct resource *res, u32 *val)
+{
+        u32 size = (u32)(res->end - res->start)+1;
+
+        size += CHECK_CHUNKSIZE-1;
+        size /= CHECK_CHUNKSIZE;
+
+        DBG("Area %08lx..%08lx, %d blocks\n", res->start, res->end, size);
+
+        *val += size * sizeof(u32);
+        return val;
+}
+
+/* s3c2410_pm_prepare_check
+ *
+ * prepare the necessary information for creating the CRCs. This
+ * must be done before the final save, as it will require memory
+ * allocating, and thus touching bits of the kernel we do not
+ * know about.
+*/
+
+static void s3c2410_pm_check_prepare(void)
+{
+        crc_size = 0;
+
+        s3c2410_pm_run_sysram(s3c2410_pm_countram, &crc_size);
+
+        DBG("s3c2410_pm_prepare_check: %u checks needed\n", crc_size);
+
+        crcs = kmalloc(crc_size+4, GFP_KERNEL);
+        if (crcs == NULL)
+                printk(KERN_ERR "Cannot allocated CRC save area\n");
+}
+
+static u32 *s3c2410_pm_makecheck(struct resource *res, u32 *val)
+{
+        unsigned long addr, left;
+
+        for (addr = res->start; addr < res->end;
+             addr += CHECK_CHUNKSIZE) {
+                left = res->end - addr;
+
+                if (left > CHECK_CHUNKSIZE)
+                        left = CHECK_CHUNKSIZE;
+
+                *val = crc32_le(~0, phys_to_virt(addr), left);
+                val++;
+        }
+
+        return val;
+}
+
+/* s3c2410_pm_check_store
+ *
+ * compute the CRC values for the memory blocks before the final
+ * sleep.
+*/
+
+static void s3c2410_pm_check_store(void)
+{
+        if (crcs != NULL)
+                s3c2410_pm_run_sysram(s3c2410_pm_makecheck, crcs);
+}
+
+/* in_region
+ *
+ * return TRUE if the area defined by ptr..ptr+size contatins the
+ * what..what+whatsz
+*/
+
+static inline int in_region(void *ptr, int size, void *what, size_t whatsz)
+{
+        if ((what+whatsz) < ptr)
+                return 0;
+
+        if (what > (ptr+size))
+                return 0;
+
+        return 1;
+}
+
+static u32 *s3c2410_pm_runcheck(struct resource *res, u32 *val)
+{
+        void *save_at = phys_to_virt(s3c2410_sleep_save_phys);
+        unsigned long addr;
+        unsigned long left;
+        void *ptr;
+        u32 calc;
+
+        for (addr = res->start; addr < res->end;
+             addr += CHECK_CHUNKSIZE) {
+                left = res->end - addr;
+
+                if (left > CHECK_CHUNKSIZE)
+                        left = CHECK_CHUNKSIZE;
+
+                ptr = phys_to_virt(addr);
+
+                if (in_region(ptr, left, crcs, crc_size)) {
+                        DBG("skipping %08lx, has crc block in\n", addr);
+                        goto skip_check;
+                }
+
+                if (in_region(ptr, left, save_at, 32*4 )) {
+                        DBG("skipping %08lx, has save block in\n", addr);
+                        goto skip_check;
+                }
+
+                /* calculate and check the checksum */
+
+                calc = crc32_le(~0, ptr, left);
+                if (calc != *val) {
+                        printk(KERN_ERR PFX "Restore CRC error at "
+                               "%08lx (%08x vs %08x)\n", addr, calc, *val);
+
+                        DBG("Restore CRC error at %08lx (%08x vs %08x)\n",
+                            addr, calc, *val);
+                }
+
+        skip_check:
+                val++;
+        }
+
+        return val;
+}
+
+/* s3c2410_pm_check_restore
+ *
+ * check the CRCs after the restore event and free the memory used
+ * to hold them
+*/
+
+static void s3c2410_pm_check_restore(void)
+{
+        if (crcs != NULL) {
+                s3c2410_pm_run_sysram(s3c2410_pm_runcheck, crcs);
+                kfree(crcs);
+                crcs = NULL;
+        }
+}
+
+#else
+
+#define s3c2410_pm_check_prepare() do { } while(0)
+#define s3c2410_pm_check_restore() do { } while(0)
+#define s3c2410_pm_check_store()   do { } while(0)
+#endif
+
+/* helper functions to save and restore register state */
+
+void s3c2410_pm_do_save(struct sleep_save *ptr, int count)
+{
+        for (; count > 0; count--, ptr++) {
+                ptr->val = __raw_readl(ptr->reg);
+                DBG("saved %p value %08lx\n", ptr->reg, ptr->val);
+        }
+}
+
+/* s3c2410_pm_do_restore
+ *
+ * restore the system from the given list of saved registers
+ *
+ * Note, we do not use DBG() in here, as the system may not have
+ * restore the UARTs state yet
+*/
+
+void s3c2410_pm_do_restore(struct sleep_save *ptr, int count)
+{
+        for (; count > 0; count--, ptr++) {
+                printk(KERN_DEBUG "restore %p (restore %08lx, was %08x)\n",
+                       ptr->reg, ptr->val, __raw_readl(ptr->reg));
+
+                __raw_writel(ptr->val, ptr->reg);
+        }
+}
+
+/* s3c2410_pm_do_restore_core
+ *
+ * similar to s3c2410_pm_do_restore_core
+ *
+ * WARNING: Do not put any debug in here that may effect memory or use
+ * peripherals, as things may be changing!
+*/
+
+static void s3c2410_pm_do_restore_core(struct sleep_save *ptr, int count)
+{
+        for (; count > 0; count--, ptr++) {
+                __raw_writel(ptr->val, ptr->reg);
+        }
+}
+
+/* s3c2410_pm_show_resume_irqs
+ *
+ * print any IRQs asserted at resume time (ie, we woke from)
+*/
+
+static void s3c2410_pm_show_resume_irqs(int start, unsigned long which,
+                                        unsigned long mask)
+{
+        int i;
+
+        which &= ~mask;
+
+        for (i = 0; i <= 31; i++) {
+                if ((which) & (1L<<i)) {
+                        DBG("IRQ %d asserted at resume\n", start+i);
+                }
+        }
+}
+
+/* s3c2410_pm_check_resume_pin
+ *
+ * check to see if the pin is configured correctly for sleep mode, and
+ * make any necessary adjustments if it is not
+*/
+
+static void s3c2410_pm_check_resume_pin(unsigned int pin, unsigned int irqoffs)
+{
+        unsigned long irqstate;
+        unsigned long pinstate;
+        int irq = s3c2410_gpio_getirq(pin);
+
+        if (irqoffs < 4)
+                irqstate = s3c_irqwake_intmask & (1L<<irqoffs);
+        else
+                irqstate = s3c_irqwake_eintmask & (1L<<irqoffs);
+
+        pinstate = s3c2410_gpio_getcfg(pin);
+
+        if (!irqstate) {
+                if (pinstate == S3C2410_GPIO_IRQ)
+                        DBG("Leaving IRQ %d (pin %d) enabled\n", irq, pin);
+        } else {
+                if (pinstate == S3C2410_GPIO_IRQ) {
+                        DBG("Disabling IRQ %d (pin %d)\n", irq, pin);
+                        s3c2410_gpio_cfgpin(pin, S3C2410_GPIO_INPUT);
+                }
+        }
+}
+
+/* s3c2410_pm_configure_extint
+ *
+ * configure all external interrupt pins
+*/
+
+static void s3c2410_pm_configure_extint(void)
+{
+        int pin;
+
+        /* for each of the external interrupts (EINT0..EINT15) we
+         * need to check wether it is an external interrupt source,
+         * and then configure it as an input if it is not
+        */
+
+        for (pin = S3C2410_GPF0; pin <= S3C2410_GPF7; pin++) {
+                s3c2410_pm_check_resume_pin(pin, pin - S3C2410_GPF0);
+        }
+
+        for (pin = S3C2410_GPG0; pin <= S3C2410_GPG7; pin++) {
+                s3c2410_pm_check_resume_pin(pin, (pin - S3C2410_GPG0)+8);
+        }
+}
+
+void (*pm_cpu_prep)(void);
+void (*pm_cpu_sleep)(void);
+
+#define any_allowed(mask, allow) (((mask) & (allow)) != (allow))
+
+/* s3c2410_pm_enter
+ *
+ * central control for sleep/resume process
+*/
+
+static int s3c2410_pm_enter(suspend_state_t state)
+{
+        unsigned long regs_save[16];
+
+        /* ensure the debug is initialised (if enabled) */
+
+        s3c2410_pm_debug_init();
+
+        DBG("s3c2410_pm_enter(%d)\n", state);
+
+        if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
+                printk(KERN_ERR PFX "error: no cpu sleep functions set\n");
+                return -EINVAL;
+        }
+
+        if (state != PM_SUSPEND_MEM) {
+                printk(KERN_ERR PFX "error: only PM_SUSPEND_MEM supported\n");
+                return -EINVAL;
+        }
+
+        /* check if we have anything to wake-up with... bad things seem
+         * to happen if you suspend with no wakeup (system will often
+         * require a full power-cycle)
+        */
+
+        if (!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
+            !any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
+                printk(KERN_ERR PFX "No sources enabled for wake-up!\n");
+                printk(KERN_ERR PFX "Aborting sleep\n");
+                return -EINVAL;
+        }
+
+        /* prepare check area if configured */
+
+        s3c2410_pm_check_prepare();
+
+        /* store the physical address of the register recovery block */
+
+        s3c2410_sleep_save_phys = virt_to_phys(regs_save);
+
+        DBG("s3c2410_sleep_save_phys=0x%08lx\n", s3c2410_sleep_save_phys);
+
+        /* save all necessary core registers not covered by the drivers */
+
+        s3c2410_pm_do_save(gpio_save, ARRAY_SIZE(gpio_save));
+        s3c2410_pm_do_save(core_save, ARRAY_SIZE(core_save));
+        s3c2410_pm_do_save(uart_save, ARRAY_SIZE(uart_save));
+
+        /* set the irq configuration for wake */
+
+        s3c2410_pm_configure_extint();
+
+        DBG("sleep: irq wakeup masks: %08lx,%08lx\n",
+            s3c_irqwake_intmask, s3c_irqwake_eintmask);
+
+        __raw_writel(s3c_irqwake_intmask, S3C2410_INTMSK);
+        __raw_writel(s3c_irqwake_eintmask, S3C2410_EINTMASK);
+
+        /* ack any outstanding external interrupts before we go to sleep */
+
+        __raw_writel(__raw_readl(S3C2410_EINTPEND), S3C2410_EINTPEND);
+        __raw_writel(__raw_readl(S3C2410_INTPND), S3C2410_INTPND);
+        __raw_writel(__raw_readl(S3C2410_SRCPND), S3C2410_SRCPND);
+
+        /* call cpu specific preperation */
+
+        pm_cpu_prep();
+
+        /* flush cache back to ram */
+
+        flush_cache_all();
+
+        s3c2410_pm_check_store();
+
+        /* send the cpu to sleep... */
+
+        __raw_writel(0x00, S3C2410_CLKCON);  /* turn off clocks over sleep */
+
+        /* s3c2410_cpu_save will also act as our return point from when
+         * we resume as it saves its own register state, so use the return
+         * code to differentiate return from save and return from sleep */
+
+        if (s3c2410_cpu_save(regs_save) == 0) {
+                flush_cache_all();
+                pm_cpu_sleep();
+        }
+
+        /* restore the cpu state */
+
+        cpu_init();
+
+        /* restore the system state */
+
+        s3c2410_pm_do_restore_core(core_save, ARRAY_SIZE(core_save));
+        s3c2410_pm_do_restore(gpio_save, ARRAY_SIZE(gpio_save));
+        s3c2410_pm_do_restore(uart_save, ARRAY_SIZE(uart_save));
+
+        s3c2410_pm_debug_init();
+
+        /* check what irq (if any) restored the system */
+
+        DBG("post sleep: IRQs 0x%08x, 0x%08x\n",
+            __raw_readl(S3C2410_SRCPND),
+            __raw_readl(S3C2410_EINTPEND));
+
+        s3c2410_pm_show_resume_irqs(IRQ_EINT0, __raw_readl(S3C2410_SRCPND),
+                                    s3c_irqwake_intmask);
+
+        s3c2410_pm_show_resume_irqs(IRQ_EINT4-4, __raw_readl(S3C2410_EINTPEND),
+                                    s3c_irqwake_eintmask);
+
+        DBG("post sleep, preparing to return\n");
+
+        s3c2410_pm_check_restore();
+
+        /* ok, let's return from sleep */
+
+        DBG("S3C2410 PM Resume (post-restore)\n");
+        return 0;
+}
+
+/*
+ * Called after processes are frozen, but before we shut down devices.
+ */
+static int s3c2410_pm_prepare(suspend_state_t state)
+{
+        return 0;
+}
+
+/*
+ * Called after devices are re-setup, but before processes are thawed.
+ */
+static int s3c2410_pm_finish(suspend_state_t state)
+{
+        return 0;
+}
+
+/*
+ * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
+ */
+static struct pm_ops s3c2410_pm_ops = {
+        .pm_disk_mode   = PM_DISK_FIRMWARE,
+        .prepare        = s3c2410_pm_prepare,
+        .enter          = s3c2410_pm_enter,
+        .finish         = s3c2410_pm_finish,
+};
+
+/* s3c2410_pm_init
+ *
+ * Attach the power management functions. This should be called
+ * from the board specific initialisation if the board supports
+ * it.
+*/
+
+int __init s3c2410_pm_init(void)
+{
+        printk("S3C2410 Power Management, (c) 2004 Simtec Electronics\n");
+
+        pm_set_ops(&s3c2410_pm_ops);
+        return 0;
+}