ARM: atmel: use pcr to enable or disable peripheral clock

When use pcr (peripheral control register), then we won't need
to care about the peripheral ID.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>

arch/arm/cpu/armv7/at91/clock.c

@@ -114,9 +114,25 @@ int at91_clock_init(unsigned long main_clock)
 void at91_periph_clk_enable(int id)
 {
 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+	u32 regval;
 
-	if (id > 31)
-		writel(1 << (id - 32), &pmc->pcer1);
-	else
-		writel(1 << id, &pmc->pcer);
+	if (id > AT91_PMC_PCR_PID_MASK)
+		return;
+
+	regval = AT91_PMC_PCR_EN | AT91_PMC_PCR_CMD_WRITE | id;
+
+	writel(regval, &pmc->pcr);
+}
+
+void at91_periph_clk_disable(int id)
+{
+	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+	u32 regval;
+
+	if (id > AT91_PMC_PCR_PID_MASK)
+		return;
+
+	regval = AT91_PMC_PCR_CMD_WRITE | id;
+
+	writel(regval, &pmc->pcr);
 }

arch/arm/include/asm/arch-at91/at91_pmc.h

@@ -147,6 +147,10 @@ typedef struct at91_pmc {
 #define AT91_PMC_IXR_PCKRDY3		0x00000800
 #define AT91_PMC_IXR_MOSCSELS		0x00010000
 
+#define AT91_PMC_PCR_PID_MASK		(0x3f)
+#define AT91_PMC_PCR_CMD_WRITE		(0x1 << 12)
+#define AT91_PMC_PCR_EN			(0x1 << 28)
+
 #define		AT91_PMC_PCK		(1 <<  0)		/* Processor Clock */
 #define		AT91RM9200_PMC_UDP	(1 <<  1)		/* USB Devcice Port Clock [AT91RM9200 only] */
 #define		AT91RM9200_PMC_MCKUDP	(1 <<  2)		/* USB Device Port Master Clock Automatic Disable on Suspend [AT91RM9200 only] */

arch/arm/include/asm/arch-at91/clk.h

@@ -80,4 +80,5 @@ static inline unsigned long get_mci_clk_rate(void)
 
 int at91_clock_init(unsigned long main_clock);
 void at91_periph_clk_enable(int id);
+void at91_periph_clk_disable(int id);
 #endif /* __ASM_ARM_ARCH_CLK_H__ */