Merge tag 'zynq-cleanup-for-3.12' of git://git.xilinx.com/linux-xlnx into next/cleanup

From: Michal Simek:
arm: Xilinx Zynq cleanup patches for v3.12

This branch contains these fixes:
- SLCR cleanup
- Hotplug cleanup

* tag 'zynq-cleanup-for-3.12' of git://git.xilinx.com/linux-xlnx:
  arm: zynq: hotplug: Remove unreachable code
  arm: zynq: slcr: Use read-modify-write for register writes
  arm: zynq: slcr: Clean up #defines
  arm: zynq: slcr: Remove redundant header #includes
Signed-off-by: Kevin Hilman <khilman@linaro.org>

arch/arm/mach-zynq/hotplug.c

@@ -40,44 +40,6 @@ static inline void zynq_cpu_enter_lowpower(void)
 	  : "cc");
 }
 
-static inline void zynq_cpu_leave_lowpower(void)
-{
-	unsigned int v;
-
-	asm volatile(
-	"	mrc	p15, 0, %0, c1, c0, 0\n"
-	"	orr	%0, %0, %1\n"
-	"	mcr	p15, 0, %0, c1, c0, 0\n"
-	"	mrc	p15, 0, %0, c1, c0, 1\n"
-	"	orr	%0, %0, #0x40\n"
-	"	mcr	p15, 0, %0, c1, c0, 1\n"
-	  : "=&r" (v)
-	  : "Ir" (CR_C)
-	  : "cc");
-}
-
-static inline void zynq_platform_do_lowpower(unsigned int cpu, int *spurious)
-{
-	/*
-	 * there is no power-control hardware on this platform, so all
-	 * we can do is put the core into WFI; this is safe as the calling
-	 * code will have already disabled interrupts
-	 */
-	for (;;) {
-		dsb();
-		wfi();
-
-		/*
-		 * Getting here, means that we have come out of WFI without
-		 * having been woken up - this shouldn't happen
-		 *
-		 * Just note it happening - when we're woken, we can report
-		 * its occurrence.
-		 */
-		(*spurious)++;
-	}
-}
-
 /*
  * platform-specific code to shutdown a CPU
  *
@@ -85,20 +47,13 @@ static inline void zynq_platform_do_lowpower(unsigned int cpu, int *spurious)
  */
 void zynq_platform_cpu_die(unsigned int cpu)
 {
-	int spurious = 0;
-
-	/*
-	 * we're ready for shutdown now, so do it
-	 */
 	zynq_cpu_enter_lowpower();
-	zynq_platform_do_lowpower(cpu, &spurious);
 
 	/*
-	 * bring this CPU back into the world of cache
-	 * coherency, and then restore interrupts
+	 * there is no power-control hardware on this platform, so all
+	 * we can do is put the core into WFI; this is safe as the calling
+	 * code will have already disabled interrupts
 	 */
-	zynq_cpu_leave_lowpower();
-
-	if (spurious)
-		pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
+	for (;;)
+		cpu_do_idle();
 }

arch/arm/mach-zynq/slcr.c

@@ -14,32 +14,21 @@
  * 02139, USA.
  */
 
-#include <linux/export.h>
 #include <linux/io.h>
-#include <linux/fs.h>
-#include <linux/interrupt.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/of_address.h>
-#include <linux/uaccess.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/string.h>
 #include <linux/clk/zynq.h>
 #include "common.h"
 
-#define SLCR_UNLOCK_MAGIC		0xDF0D
-#define SLCR_UNLOCK			0x8   /* SCLR unlock register */
-
+/* register offsets */
+#define SLCR_UNLOCK_OFFSET		0x8   /* SCLR unlock register */
 #define SLCR_PS_RST_CTRL_OFFSET		0x200 /* PS Software Reset Control */
+#define SLCR_A9_CPU_RST_CTRL_OFFSET	0x244 /* CPU Software Reset Control */
+#define SLCR_REBOOT_STATUS_OFFSET	0x258 /* PS Reboot Status */
 
+#define SLCR_UNLOCK_MAGIC		0xDF0D
 #define SLCR_A9_CPU_CLKSTOP		0x10
 #define SLCR_A9_CPU_RST			0x1
 
-#define SLCR_A9_CPU_RST_CTRL		0x244 /* CPU Software Reset Control */
-#define SLCR_REBOOT_STATUS		0x258 /* PS Reboot Status */
-
 void __iomem *zynq_slcr_base;
 
 /**
@@ -54,15 +43,15 @@ void zynq_slcr_system_reset(void)
 	 * Note that this seems to require raw i/o
 	 * functions or there's a lockup?
 	 */
-	writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK);
+	writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK_OFFSET);
 
 	/*
 	 * Clear 0x0F000000 bits of reboot status register to workaround
 	 * the FSBL not loading the bitstream after soft-reboot
 	 * This is a temporary solution until we know more.
 	 */
-	reboot = readl(zynq_slcr_base + SLCR_REBOOT_STATUS);
-	writel(reboot & 0xF0FFFFFF, zynq_slcr_base + SLCR_REBOOT_STATUS);
+	reboot = readl(zynq_slcr_base + SLCR_REBOOT_STATUS_OFFSET);
+	writel(reboot & 0xF0FFFFFF, zynq_slcr_base + SLCR_REBOOT_STATUS_OFFSET);
 	writel(1, zynq_slcr_base + SLCR_PS_RST_CTRL_OFFSET);
 }
 
@@ -72,11 +61,11 @@ void zynq_slcr_system_reset(void)
  */
 void zynq_slcr_cpu_start(int cpu)
 {
-	/* enable CPUn */
-	writel(SLCR_A9_CPU_CLKSTOP << cpu,
-	       zynq_slcr_base + SLCR_A9_CPU_RST_CTRL);
-	/* enable CLK for CPUn */
-	writel(0x0 << cpu, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL);
+	u32 reg = readl(zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+	reg &= ~(SLCR_A9_CPU_RST << cpu);
+	writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+	reg &= ~(SLCR_A9_CPU_CLKSTOP << cpu);
+	writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
 }
 
 /**
@@ -85,9 +74,9 @@ void zynq_slcr_cpu_start(int cpu)
  */
 void zynq_slcr_cpu_stop(int cpu)
 {
-	/* stop CLK and reset CPUn */
-	writel((SLCR_A9_CPU_CLKSTOP | SLCR_A9_CPU_RST) << cpu,
-	       zynq_slcr_base + SLCR_A9_CPU_RST_CTRL);
+	u32 reg = readl(zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+	reg |= (SLCR_A9_CPU_CLKSTOP | SLCR_A9_CPU_RST) << cpu;
+	writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
 }
 
 /**
@@ -113,7 +102,7 @@ int __init zynq_slcr_init(void)
 	}
 
 	/* unlock the SLCR so that registers can be changed */
-	writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK);
+	writel(SLCR_UNLOCK_MAGIC, zynq_slcr_base + SLCR_UNLOCK_OFFSET);
 
 	pr_info("%s mapped to %p\n", np->name, zynq_slcr_base);