powerpc/mpc5200: Fix lite5200b suspend/resume

Suspend/resume ("echo mem > /sys/power/state") does not work with
vanilla kernels -- the system does not suspend correctly and just
hangs. This patch fixes this so suspend/resume works:

1) of_iomap does not map the whole 0xC000 of the MPC5200 immr so
saving registers does not work.
2) PCI registers need to be saved and restored.

Signed-off-by: Tim Yamin <plasm@roo.me.uk>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/arch/powerpc/platforms/52xx/lite5200_pm.c b/arch/powerpc/platforms/52xx/lite5200_pm.c
index 41c7fd9..fe92e65 100644 (file)
--- a/arch/powerpc/platforms/52xx/lite5200_pm.c
+++ b/arch/powerpc/platforms/52xx/lite5200_pm.c
@@ -14,6 +14,7 @@ static struct mpc52xx_sdma __iomem *bes;
 static struct mpc52xx_xlb __iomem *xlb;
 static struct mpc52xx_gpio __iomem *gps;
 static struct mpc52xx_gpio_wkup __iomem *gpw;
+static void __iomem *pci;
 static void __iomem *sram;
 static const int sram_size = 0x4000;   /* 16 kBytes */
 static void __iomem *mbar;
@@ -50,6 +51,8 @@ static int lite5200_pm_prepare(void)
                { .type = "builtin", .compatible = "mpc5200", }, /* efika */
                {}
        };
+       u64 regaddr64 = 0;
+       const u32 *regaddr_p;
 
        /* deep sleep? let mpc52xx code handle that */
        if (lite5200_pm_target_state == PM_SUSPEND_STANDBY)
@@ -60,8 +63,12 @@ static int lite5200_pm_prepare(void)
 
        /* map registers */
        np = of_find_matching_node(NULL, immr_ids);
-       mbar = of_iomap(np, 0);
+       regaddr_p = of_get_address(np, 0, NULL, NULL);
+       if (regaddr_p)
+               regaddr64 = of_translate_address(np, regaddr_p);
        of_node_put(np);
+
+       mbar = ioremap((u32) regaddr64, 0xC000);
        if (!mbar) {
                printk(KERN_ERR "%s:%i Error mapping registers\n", __func__, __LINE__);
                return -ENOSYS;
@@ -71,6 +78,7 @@ static int lite5200_pm_prepare(void)
        pic = mbar + 0x500;
        gps = mbar + 0xb00;
        gpw = mbar + 0xc00;
+       pci = mbar + 0xd00;
        bes = mbar + 0x1200;
        xlb = mbar + 0x1f00;
        sram = mbar + 0x8000;
@@ -85,6 +93,7 @@ static struct mpc52xx_sdma sbes;
 static struct mpc52xx_xlb sxlb;
 static struct mpc52xx_gpio sgps;
 static struct mpc52xx_gpio_wkup sgpw;
+static char spci[0x200];
 
 static void lite5200_save_regs(void)
 {
@@ -94,6 +103,7 @@ static void lite5200_save_regs(void)
        _memcpy_fromio(&sxlb, xlb, sizeof(*xlb));
        _memcpy_fromio(&sgps, gps, sizeof(*gps));
        _memcpy_fromio(&sgpw, gpw, sizeof(*gpw));
+       _memcpy_fromio(spci, pci, 0x200);
 
        _memcpy_fromio(saved_sram, sram, sram_size);
 }
@@ -103,6 +113,8 @@ static void lite5200_restore_regs(void)
        int i;
        _memcpy_toio(sram, saved_sram, sram_size);
 
+       /* PCI Configuration */
+       _memcpy_toio(pci, spci, 0x200);
 
        /*
         * GPIOs. Interrupt Master Enable has higher address then other