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authorKevin Hilman <khilman@linaro.org>2013-08-20 15:04:47 -0700
committerKevin Hilman <khilman@linaro.org>2013-08-20 15:05:31 -0700
commitc454194612e2e88d470f10b959db8ca0045c99bb (patch)
tree04ed22d8791f369a5b130d26f327de7acec24cf8
parent47aad66c2659b8985512b66f87bb5fe7bdc88dff (diff)
parentb522877b53cf3f26d7f072616a45e10fe579cd19 (diff)
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>
-rw-r--r--arch/arm/mach-zynq/hotplug.c55
-rw-r--r--arch/arm/mach-zynq/slcr.c45
2 files changed, 22 insertions, 78 deletions
diff --git a/arch/arm/mach-zynq/hotplug.c b/arch/arm/mach-zynq/hotplug.c
index c89672bd1de2..5052c70326e4 100644
--- a/arch/arm/mach-zynq/hotplug.c
+++ b/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();
}
diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c
index 50d008d8f87f..1836d5a34606 100644
--- a/arch/arm/mach-zynq/slcr.c
+++ b/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);