Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Enable restart support for lite5200 board
  [POWERPC] Add restart support for mpc52xx based platforms
  [POWERPC] Update device tree binding for mpc5200 gpt
  [POWERPC] Add mpc52xx_find_and_map_path(), refactor utility functions
  [POWERPC] bestcomm: Restrict bus prefetch bugfix to original mpc5200 silicon.

8 files changed, 109 insertions, 43 deletions

diff --git a/Documentation/powerpc/mpc52xx-device-tree-bindings.txt b/Documentation/powerpc/mpc52xx-device-tree-bindings.txt
index 5f7d536cb0c6..5e03610e186f 100644
--- a/Documentation/powerpc/mpc52xx-device-tree-bindings.txt
+++ b/Documentation/powerpc/mpc52xx-device-tree-bindings.txt
@@ -185,7 +185,7 @@ bestcomm@<addr>	dma-controller		mpc5200-bestcomm 5200 pic also requires
 Recommended soc5200 child nodes; populate as needed for your board
 name            device_type     compatible        Description
 ----            -----------     ----------        -----------
-gpt@<addr>      gpt             mpc5200-gpt       General purpose timers
+gpt@<addr>      gpt             fsl,mpc5200-gpt   General purpose timers
 rtc@<addr>      rtc             mpc5200-rtc       Real time clock
 mscan@<addr>    mscan           mpc5200-mscan     CAN bus controller
 pci@<addr>      pci             mpc5200-pci       PCI bridge
@@ -213,7 +213,7 @@ cell-index	int		When multiple devices are present, is the
 5) General Purpose Timer nodes (child of soc5200 node)
 On the mpc5200 and 5200b, GPT0 has a watchdog timer function.  If the board
 design supports the internal wdt, then the device node for GPT0 should
-include the empty property 'has-wdt'.
+include the empty property 'fsl,has-wdt'.
 
 6) PSC nodes (child of soc5200 node)
 PSC nodes can define the optional 'port-number' property to force assignment
diff --git a/arch/powerpc/boot/dts/lite5200.dts b/arch/powerpc/boot/dts/lite5200.dts
index bc45f5fbb060..6731763f0282 100644
--- a/arch/powerpc/boot/dts/lite5200.dts
+++ b/arch/powerpc/boot/dts/lite5200.dts
@@ -70,18 +70,16 @@
                 };
 
                 gpt@600 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <0>;
                         reg = <600 10>;
                         interrupts = <1 9 0>;
                         interrupt-parent = <&mpc5200_pic>;
-                        has-wdt;
+                        fsl,has-wdt;
                 };
 
                 gpt@610 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <1>;
                         reg = <610 10>;
                         interrupts = <1 a 0>;
@@ -89,8 +87,7 @@
                 };
 
                 gpt@620 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <2>;
                         reg = <620 10>;
                         interrupts = <1 b 0>;
@@ -98,8 +95,7 @@
                 };
 
                 gpt@630 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <3>;
                         reg = <630 10>;
                         interrupts = <1 c 0>;
@@ -107,8 +103,7 @@
                 };
 
                 gpt@640 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <4>;
                         reg = <640 10>;
                         interrupts = <1 d 0>;
@@ -116,8 +111,7 @@
                 };
 
                 gpt@650 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <5>;
                         reg = <650 10>;
                         interrupts = <1 e 0>;
@@ -125,8 +119,7 @@
                 };
 
                 gpt@660 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <6>;
                         reg = <660 10>;
                         interrupts = <1 f 0>;
@@ -134,8 +127,7 @@
                 };
 
                 gpt@670 {       // General Purpose Timer
-                        compatible = "mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200-gpt";
                         cell-index = <7>;
                         reg = <670 10>;
                         interrupts = <1 10 0>;
diff --git a/arch/powerpc/boot/dts/lite5200b.dts b/arch/powerpc/boot/dts/lite5200b.dts
index 6582c9a39b27..b540388c608c 100644
--- a/arch/powerpc/boot/dts/lite5200b.dts
+++ b/arch/powerpc/boot/dts/lite5200b.dts
@@ -70,18 +70,16 @@
                 };
 
                 gpt@600 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <0>;
                         reg = <600 10>;
                         interrupts = <1 9 0>;
                         interrupt-parent = <&mpc5200_pic>;
-                        has-wdt;
+                        fsl,has-wdt;
                 };
 
                 gpt@610 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <1>;
                         reg = <610 10>;
                         interrupts = <1 a 0>;
@@ -89,8 +87,7 @@
                 };
 
                 gpt@620 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <2>;
                         reg = <620 10>;
                         interrupts = <1 b 0>;
@@ -98,8 +95,7 @@
                 };
 
                 gpt@630 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <3>;
                         reg = <630 10>;
                         interrupts = <1 c 0>;
@@ -107,8 +103,7 @@
                 };
 
                 gpt@640 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <4>;
                         reg = <640 10>;
                         interrupts = <1 d 0>;
@@ -116,8 +111,7 @@
                 };
 
                 gpt@650 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <5>;
                         reg = <650 10>;
                         interrupts = <1 e 0>;
@@ -125,8 +119,7 @@
                 };
 
                 gpt@660 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <6>;
                         reg = <660 10>;
                         interrupts = <1 f 0>;
@@ -134,8 +127,7 @@
                 };
 
                 gpt@670 {       // General Purpose Timer
-                        compatible = "mpc5200b-gpt","mpc5200-gpt";
-                        device_type = "gpt";
+                        compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
                         cell-index = <7>;
                         reg = <670 10>;
                         interrupts = <1 10 0>;
diff --git a/arch/powerpc/platforms/52xx/lite5200.c b/arch/powerpc/platforms/52xx/lite5200.c
index 65b7ae426238..25d2bfa3d9dc 100644
--- a/arch/powerpc/platforms/52xx/lite5200.c
+++ b/arch/powerpc/platforms/52xx/lite5200.c
@@ -145,6 +145,9 @@ static void __init lite5200_setup_arch(void)
         /* Some mpc5200 & mpc5200b related configuration */
         mpc5200_setup_xlb_arbiter();
 
+        /* Map wdt for mpc52xx_restart() */
+        mpc52xx_map_wdt();
+
 #ifdef CONFIG_PM
         mpc52xx_suspend.board_suspend_prepare = lite5200_suspend_prepare;
         mpc52xx_suspend.board_resume_finish = lite5200_resume_finish;
@@ -183,5 +186,6 @@ define_machine(lite5200) {
         .init           = mpc52xx_declare_of_platform_devices,
         .init_IRQ       = mpc52xx_init_irq,
         .get_irq        = mpc52xx_get_irq,
+        .restart        = mpc52xx_restart,
         .calibrate_decr = generic_calibrate_decr,
 };
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c
index 3bc201e07e6b..9850685c5429 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_common.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c
@@ -18,15 +18,20 @@
 #include <asm/prom.h>
 #include <asm/mpc52xx.h>
 
+/*
+ * This variable is mapped in mpc52xx_map_wdt() and used in mpc52xx_restart().
+ * Permanent mapping is required because mpc52xx_restart() can be called
+ * from interrupt context while node mapping (which calls ioremap())
+ * cannot be used at such point.
+ */
+static volatile struct mpc52xx_gpt *mpc52xx_wdt = NULL;
 
-void __iomem *
-mpc52xx_find_and_map(const char *compatible)
+static void __iomem *
+mpc52xx_map_node(struct device_node *ofn)
 {
-        struct device_node *ofn;
         const u32 *regaddr_p;
         u64 regaddr64, size64;
 
-        ofn = of_find_compatible_node(NULL, NULL, compatible);
         if (!ofn)
                 return NULL;
 
@@ -42,8 +47,23 @@ mpc52xx_find_and_map(const char *compatible)
 
         return ioremap((u32)regaddr64, (u32)size64);
 }
+
+void __iomem *
+mpc52xx_find_and_map(const char *compatible)
+{
+        return mpc52xx_map_node(
+                of_find_compatible_node(NULL, NULL, compatible));
+}
+
 EXPORT_SYMBOL(mpc52xx_find_and_map);
 
+void __iomem *
+mpc52xx_find_and_map_path(const char *path)
+{
+        return mpc52xx_map_node(of_find_node_by_path(path));
+}
+
+EXPORT_SYMBOL(mpc52xx_find_and_map_path);
 
 /**
  *      mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
@@ -113,3 +133,46 @@ mpc52xx_declare_of_platform_devices(void)
                         "Error while probing of_platform bus\n");
 }
 
+void __init
+mpc52xx_map_wdt(void)
+{
+        const void *has_wdt;
+        struct device_node *np;
+
+        /* mpc52xx_wdt is mapped here and used in mpc52xx_restart,
+         * possibly from a interrupt context. wdt is only implement
+         * on a gpt0, so check has-wdt property before mapping.
+         */
+        for_each_compatible_node(np, NULL, "fsl,mpc5200-gpt") {
+                has_wdt = of_get_property(np, "fsl,has-wdt", NULL);
+                if (has_wdt) {
+                        mpc52xx_wdt = mpc52xx_map_node(np);
+                        return;
+                }
+        }
+        for_each_compatible_node(np, NULL, "mpc5200-gpt") {
+                has_wdt = of_get_property(np, "has-wdt", NULL);
+                if (has_wdt) {
+                        mpc52xx_wdt = mpc52xx_map_node(np);
+                        return;
+                }
+        }
+}
+
+void
+mpc52xx_restart(char *cmd)
+{
+        local_irq_disable();
+
+        /* Turn on the watchdog and wait for it to expire.
+         * It effectively does a reset. */
+        if (mpc52xx_wdt) {
+                out_be32(&mpc52xx_wdt->mode, 0x00000000);
+                out_be32(&mpc52xx_wdt->count, 0x000000ff);
+                out_be32(&mpc52xx_wdt->mode, 0x00009004);
+        } else
+                printk("mpc52xx_restart: Can't access wdt. "
+                        "Restart impossible, system halted.\n");
+
+        while (1);
+}
diff --git a/arch/powerpc/sysdev/bestcomm/bestcomm.c b/arch/powerpc/sysdev/bestcomm/bestcomm.c
index 48492a83e5a7..740ad73ce5cc 100644
--- a/arch/powerpc/sysdev/bestcomm/bestcomm.c
+++ b/arch/powerpc/sysdev/bestcomm/bestcomm.c
@@ -269,6 +269,7 @@ bcom_engine_init(void)
         int task;
         phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa;
         unsigned int tdt_size, ctx_size, var_size, fdt_size;
+        u16 regval;
 
         /* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */
         tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt);
@@ -319,9 +320,11 @@ bcom_engine_init(void)
         /* Init 'always' initiator */
         out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS);
 
-        /* Disable COMM Bus Prefetch, apparently it's not reliable yet */
-        /* FIXME: This should be done on 5200 and not 5200B ... */
-        out_be16(&bcom_eng->regs->PtdCntrl, in_be16(&bcom_eng->regs->PtdCntrl) | 1);
+        /* Disable COMM Bus Prefetch on the original 5200; it's broken */
+        if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR) {
+                regval = in_be16(&bcom_eng->regs->PtdCntrl);
+                out_be16(&bcom_eng->regs->PtdCntrl,  regval | 1);
+        }
 
         /* Init lock */
         spin_lock_init(&bcom_eng->lock);
diff --git a/drivers/watchdog/mpc5200_wdt.c b/drivers/watchdog/mpc5200_wdt.c
index 9cfb97576623..11f6a111e75b 100644
--- a/drivers/watchdog/mpc5200_wdt.c
+++ b/drivers/watchdog/mpc5200_wdt.c
@@ -176,6 +176,8 @@ static int mpc5200_wdt_probe(struct of_device *op, const struct of_device_id *ma
 
         has_wdt = of_get_property(op->node, "has-wdt", NULL);
         if (!has_wdt)
+                has_wdt = of_get_property(op->node, "fsl,has-wdt", NULL);
+        if (!has_wdt)
                 return -ENODEV;
 
         wdt = kzalloc(sizeof(*wdt), GFP_KERNEL);
@@ -254,6 +256,7 @@ static int mpc5200_wdt_shutdown(struct of_device *op)
 
 static struct of_device_id mpc5200_wdt_match[] = {
         { .compatible = "mpc5200-gpt", },
+        { .compatible = "fsl,mpc5200-gpt", },
         {},
 };
 static struct of_platform_driver mpc5200_wdt_driver = {
diff --git a/include/asm-powerpc/mpc52xx.h b/include/asm-powerpc/mpc52xx.h
index 568135fe52ea..fcb2ebbfddbc 100644
--- a/include/asm-powerpc/mpc52xx.h
+++ b/include/asm-powerpc/mpc52xx.h
@@ -20,6 +20,11 @@
 
 #include <linux/suspend.h>
 
+/* Variants of the 5200(B) */
+#define MPC5200_SVR             0x80110010
+#define MPC5200_SVR_MASK        0xfffffff0
+#define MPC5200B_SVR            0x80110020
+#define MPC5200B_SVR_MASK       0xfffffff0
 
 /* ======================================================================== */
 /* Structures mapping of some unit register set                             */
@@ -244,6 +249,7 @@ struct mpc52xx_cdm {
 #ifndef __ASSEMBLY__
 
 extern void __iomem * mpc52xx_find_and_map(const char *);
+extern void __iomem * mpc52xx_find_and_map_path(const char *path);
 extern unsigned int mpc52xx_find_ipb_freq(struct device_node *node);
 extern void mpc5200_setup_xlb_arbiter(void);
 extern void mpc52xx_declare_of_platform_devices(void);
@@ -253,6 +259,9 @@ extern unsigned int mpc52xx_get_irq(void);
 
 extern int __init mpc52xx_add_bridge(struct device_node *node);
 
+extern void __init mpc52xx_map_wdt(void);
+extern void mpc52xx_restart(char *cmd);
+
 #endif /* __ASSEMBLY__ */
 
 #ifdef CONFIG_PM