USB: ehci-atmel: use pcr to enable or disable clock

If the SoC has pcr, we use pcr (peripheral control register)
to enable or disable clock.
Signed-off-by: NBo Shen <voice.shen@atmel.com>
Signed-off-by: NAndreas Bießmann <andreas.devel@googlemail.com>

drivers/usb/host/ehci-atmel.c

@@ -40,7 +40,11 @@ int ehci_hcd_init(int index, enum usb_init_type init,
 	}
 
 	/* Enable USB Host clock */
+#ifdef CPU_HAS_PCR
+	at91_periph_clk_enable(ATMEL_ID_UHPHS);
+#else
 	writel(1 << ATMEL_ID_UHPHS, &pmc->pcer);
+#endif
 
 	*hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI;
 	*hcor = (struct ehci_hcor *)((uint32_t)*hccr +
@@ -55,7 +59,11 @@ int ehci_hcd_stop(int index)
 	ulong start_time, tmp_time;
 
 	/* Disable USB Host Clock */
+#ifdef CPU_HAS_PCR
+	at91_periph_clk_disable(ATMEL_ID_UHPHS);
+#else
 	writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr);
+#endif
 
 	start_time = get_timer(0);
 	/* Disable UTMI PLL */