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>

arch/arm/mach-zynq/slcr.c

@@ -34,6 +34,42 @@
 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.
  */
@@ -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);
 }
 
 /**