summaryrefslogtreecommitdiff
path: root/arch/arm/mach-zynq
diff options
context:
space:
mode:
authorMichal Simek <michal.simek@xilinx.com>2014-01-06 14:52:02 +0100
committerMichal Simek <michal.simek@xilinx.com>2014-02-10 11:21:22 +0100
commit871c6971ec38d485fa601f6d9f60cb8d25a5aae1 (patch)
tree13cee4c85e4027522750bc3c8211fb5b8f206a38 /arch/arm/mach-zynq
parent7b274efef794fe566ee42f3091276d0598952558 (diff)
downloadlwn-871c6971ec38d485fa601f6d9f60cb8d25a5aae1.tar.gz
lwn-871c6971ec38d485fa601f6d9f60cb8d25a5aae1.zip
ARM: zynq: Add and use zynq_slcr_read/write() helper functions
Use zynq_slcr_read/write helper functions for reg access instead of readl/writel. Also use regmap when it is ready. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/arm/mach-zynq')
-rw-r--r--arch/arm/mach-zynq/slcr.c56
1 files changed, 48 insertions, 8 deletions
diff --git a/arch/arm/mach-zynq/slcr.c b/arch/arm/mach-zynq/slcr.c
index 34c1c2a20d8b..ab85f4e8edb0 100644
--- a/arch/arm/mach-zynq/slcr.c
+++ b/arch/arm/mach-zynq/slcr.c
@@ -35,6 +35,42 @@ static void __iomem *zynq_slcr_base;
static struct regmap *zynq_slcr_regmap;
/**
+ * zynq_slcr_write - Write to a register in SLCR block
+ *
+ * @val: Value to write to the register
+ * @offset: Register offset in SLCR block
+ *
+ * Return: a negative value on error, 0 on success
+ */
+static int zynq_slcr_write(u32 val, u32 offset)
+{
+ if (!zynq_slcr_regmap) {
+ writel(val, zynq_slcr_base + offset);
+ return 0;
+ }
+
+ return regmap_write(zynq_slcr_regmap, offset, val);
+}
+
+/**
+ * zynq_slcr_read - Read a register in SLCR block
+ *
+ * @val: Pointer to value to be read from SLCR
+ * @offset: Register offset in SLCR block
+ *
+ * Return: a negative value on error, 0 on success
+ */
+static int zynq_slcr_read(u32 *val, u32 offset)
+{
+ if (zynq_slcr_regmap)
+ return regmap_read(zynq_slcr_regmap, offset, val);
+
+ *val = readl(zynq_slcr_base + offset);
+
+ return 0;
+}
+
+/**
* zynq_slcr_system_reset - Reset the entire system.
*/
void zynq_slcr_system_reset(void)
@@ -53,9 +89,9 @@ void zynq_slcr_system_reset(void)
* 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_OFFSET);
- writel(reboot & 0xF0FFFFFF, zynq_slcr_base + SLCR_REBOOT_STATUS_OFFSET);
- writel(1, zynq_slcr_base + SLCR_PS_RST_CTRL_OFFSET);
+ zynq_slcr_read(&reboot, SLCR_REBOOT_STATUS_OFFSET);
+ zynq_slcr_write(reboot & 0xF0FFFFFF, SLCR_REBOOT_STATUS_OFFSET);
+ zynq_slcr_write(1, SLCR_PS_RST_CTRL_OFFSET);
}
/**
@@ -64,11 +100,13 @@ void zynq_slcr_system_reset(void)
*/
void zynq_slcr_cpu_start(int cpu)
{
- u32 reg = readl(zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ u32 reg;
+
+ zynq_slcr_read(&reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
reg &= ~(SLCR_A9_CPU_RST << cpu);
- writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ zynq_slcr_write(reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
reg &= ~(SLCR_A9_CPU_CLKSTOP << cpu);
- writel(reg, zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ zynq_slcr_write(reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
}
/**
@@ -77,9 +115,11 @@ void zynq_slcr_cpu_start(int cpu)
*/
void zynq_slcr_cpu_stop(int cpu)
{
- u32 reg = readl(zynq_slcr_base + SLCR_A9_CPU_RST_CTRL_OFFSET);
+ u32 reg;
+
+ zynq_slcr_read(&reg, 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);
+ zynq_slcr_write(reg, SLCR_A9_CPU_RST_CTRL_OFFSET);
}
/**