ARM: SAMSUNG: Move pm-check.c to plat-samsung

Move the pm-check.c file to plat-samsung for all Samsung SoC users, and
update Kconfig names to make them SAMSUNG_ instead of S3C2410_

Sed expresions used to make the change:

    s/S3C2410_PM_DEBUG/SAMSUNG_PM_DEBUG/g
    s/S3C2410_PM_CHECK/SAMSUNG_PM_CHECK/g

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

3 files changed, 288 insertions, 0 deletions

diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 6484b5bf82c3..1c2fe91c23e9 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -132,4 +132,49 @@ config S3C_DEV_NAND
         help
           Compile in platform device definition for NAND controller
 
+comment "Power management"
+
+config SAMSUNG_PM_DEBUG
+        bool "S3C2410 PM Suspend debug"
+        depends on PM
+        help
+          Say Y here if you want verbose debugging from the PM Suspend and
+          Resume code. See <file:Documentation/arm/Samsung-S3C24XX/Suspend.txt>
+          for more information.
+
+config S3C_PM_DEBUG_LED_SMDK
+       bool "SMDK LED suspend/resume debugging"
+       depends on PM && (MACH_SMDK6410)
+       help
+         Say Y here to enable the use of the SMDK LEDs on the baseboard
+         for debugging of the state of the suspend and resume process.
+
+         Note, this currently only works for S3C64XX based SMDK boards.
+
+config SAMSUNG_PM_CHECK
+        bool "S3C2410 PM Suspend Memory CRC"
+        depends on PM && CRC32
+        help
+          Enable the PM code's memory area checksum over sleep. This option
+          will generate CRCs of all blocks of memory, and store them before
+          going to sleep. The blocks are then checked on resume for any
+          errors.
+
+          Note, this can take several seconds depending on memory size
+          and CPU speed.
+
+          See <file:Documentation/arm/Samsung-S3C24XX/Suspend.txt>
+
+config SAMSUNG_PM_CHECK_CHUNKSIZE
+        int "S3C2410 PM Suspend CRC Chunksize (KiB)"
+        depends on PM && SAMSUNG_PM_CHECK
+        default 64
+        help
+          Set the chunksize in Kilobytes of the CRC for checking memory
+          corruption over suspend and resume. A smaller value will mean that
+          the CRC data block will take more memory, but wil identify any
+          faults with better precision.
+
+          See <file:Documentation/arm/Samsung-S3C24XX/Suspend.txt>
+
 endif
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index f31e64f3a1c3..c8c8caec8cde 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_S3C_DEV_NAND)	+= dev-nand.o
 # PM support
 
 obj-$(CONFIG_PM)                += pm-gpio.o
+obj-$(CONFIG_SAMSUNG_PM_CHECK)  += pm-check.o
 
 # PWM support
 
diff --git a/arch/arm/plat-samsung/pm-check.c b/arch/arm/plat-samsung/pm-check.c
new file mode 100644
index 000000000000..0b5bb774192a
--- /dev/null
+++ b/arch/arm/plat-samsung/pm-check.c
@@ -0,0 +1,242 @@
+/* linux/arch/arm/plat-s3c/pm-check.c
+ *  originally in linux/arch/arm/plat-s3c24xx/pm.c
+ *
+ * Copyright (c) 2004-2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C Power Mangament - suspend/resume memory corruptiuon check.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/suspend.h>
+#include <linux/init.h>
+#include <linux/crc32.h>
+#include <linux/ioport.h>
+
+#include <plat/pm.h>
+
+#if CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE < 1
+#error CONFIG_SAMSUNG_PM_CHECK_CHUNKSIZE must be a positive non-zero value
+#endif
+
+/* 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_SAMSUNG_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_SAMSUNG_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);
+
+/* s3c_pm_run_res
+ *
+ * go through the given resource list, and look for system ram
+*/
+
+static void s3c_pm_run_res(struct resource *ptr, run_fn_t fn, u32 *arg)
+{
+        while (ptr != NULL) {
+                if (ptr->child != NULL)
+                        s3c_pm_run_res(ptr->child, fn, arg);
+
+                if ((ptr->flags & IORESOURCE_MEM) &&
+                    strcmp(ptr->name, "System RAM") == 0) {
+                        S3C_PMDBG("Found system RAM at %08lx..%08lx\n",
+                                  (unsigned long)ptr->start,
+                                  (unsigned long)ptr->end);
+                        arg = (fn)(ptr, arg);
+                }
+
+                ptr = ptr->sibling;
+        }
+}
+
+static void s3c_pm_run_sysram(run_fn_t fn, u32 *arg)
+{
+        s3c_pm_run_res(&iomem_resource, fn, arg);
+}
+
+static u32 *s3c_pm_countram(struct resource *res, u32 *val)
+{
+        u32 size = (u32)(res->end - res->start)+1;
+
+        size += CHECK_CHUNKSIZE-1;
+        size /= CHECK_CHUNKSIZE;
+
+        S3C_PMDBG("Area %08lx..%08lx, %d blocks\n",
+                  (unsigned long)res->start, (unsigned long)res->end, size);
+
+        *val += size * sizeof(u32);
+        return val;
+}
+
+/* s3c_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.
+*/
+
+void s3c_pm_check_prepare(void)
+{
+        crc_size = 0;
+
+        s3c_pm_run_sysram(s3c_pm_countram, &crc_size);
+
+        S3C_PMDBG("s3c_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 *s3c_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;
+}
+
+/* s3c_pm_check_store
+ *
+ * compute the CRC values for the memory blocks before the final
+ * sleep.
+*/
+
+void s3c_pm_check_store(void)
+{
+        if (crcs != NULL)
+                s3c_pm_run_sysram(s3c_pm_makecheck, crcs);
+}
+
+/* in_region
+ *
+ * return TRUE if the area defined by ptr..ptr+size contains 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;
+}
+
+/**
+ * s3c_pm_runcheck() - helper to check a resource on restore.
+ * @res: The resource to check
+ * @vak: Pointer to list of CRC32 values to check.
+ *
+ * Called from the s3c_pm_check_restore() via s3c_pm_run_sysram(), this
+ * function runs the given memory resource checking it against the stored
+ * CRC to ensure that memory is restored. The function tries to skip as
+ * many of the areas used during the suspend process.
+ */
+static u32 *s3c_pm_runcheck(struct resource *res, u32 *val)
+{
+        void *save_at = phys_to_virt(s3c_sleep_save_phys);
+        unsigned long addr;
+        unsigned long left;
+        void *stkpage;
+        void *ptr;
+        u32 calc;
+
+        stkpage = (void *)((u32)&calc & ~PAGE_MASK);
+
+        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, stkpage, 4096)) {
+                        S3C_PMDBG("skipping %08lx, has stack in\n", addr);
+                        goto skip_check;
+                }
+
+                if (in_region(ptr, left, crcs, crc_size)) {
+                        S3C_PMDBG("skipping %08lx, has crc block in\n", addr);
+                        goto skip_check;
+                }
+
+                if (in_region(ptr, left, save_at, 32*4 )) {
+                        S3C_PMDBG("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 "Restore CRC error at "
+                               "%08lx (%08x vs %08x)\n", addr, calc, *val);
+
+                        S3C_PMDBG("Restore CRC error at %08lx (%08x vs %08x)\n",
+                            addr, calc, *val);
+                }
+
+        skip_check:
+                val++;
+        }
+
+        return val;
+}
+
+/**
+ * s3c_pm_check_restore() - memory check called on resume
+ *
+ * check the CRCs after the restore event and free the memory used
+ * to hold them
+*/
+void s3c_pm_check_restore(void)
+{
+        if (crcs != NULL)
+                s3c_pm_run_sysram(s3c_pm_runcheck, crcs);
+}
+
+/**
+ * s3c_pm_check_cleanup() - free memory resources
+ *
+ * Free the resources that where allocated by the suspend
+ * memory check code. We do this separately from the
+ * s3c_pm_check_restore() function as we cannot call any
+ * functions that might sleep during that resume.
+ */
+void s3c_pm_check_cleanup(void)
+{
+        kfree(crcs);
+        crcs = NULL;
+}
+