at91sam9260/9263: add back up for the rst(reset controller).

On the boards at91sam9260ek, at91sam9263ek and afed9260, the rstc register was
set to 0 after being set to 500 ms for the PHY reset.
Do backup the old reset length and restore it after the MACB initialisation.

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Signed-off-by: Stelian Pop <stelian@popies.net>

board/afeb9260/afeb9260.c

@@ -81,6 +81,8 @@ static void afeb9260_nand_hw_init(void)
 #ifdef CONFIG_MACB
 static void afeb9260_macb_hw_init(void)
 {
+	unsigned long rstc;
+
 	/* Enable clock */
 	at91_sys_write(AT91_PMC_PCER, 1 << AT91SAM9260_ID_EMAC);
 
@@ -103,6 +105,8 @@ static void afeb9260_macb_hw_init(void)
 	       pin_to_mask(AT91_PIN_PA28),
 	       pin_to_controller(AT91_PIN_PA0) + PIO_PUDR);
 
+	rstc = at91_sys_read(AT91_RSTC_MR) & AT91_RSTC_ERSTL;
+
 	/* Need to reset PHY -> 500ms reset */
 	at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY |
 				     AT91_RSTC_ERSTL | (0x0D << 8) |
@@ -115,7 +119,7 @@ static void afeb9260_macb_hw_init(void)
 
 	/* Restore NRST value */
 	at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY |
-				     AT91_RSTC_ERSTL | (0x0 << 8) |
+				     (rstc) |
 				     AT91_RSTC_URSTEN);
 
 	/* Re-enable pull-up */

board/atmel/at91sam9260ek/at91sam9260ek.c

@@ -86,6 +86,8 @@ static void at91sam9260ek_nand_hw_init(void)
 #ifdef CONFIG_MACB
 static void at91sam9260ek_macb_hw_init(void)
 {
+	unsigned long rstc;
+
 	/* Enable clock */
 	at91_sys_write(AT91_PMC_PCER, 1 << AT91SAM9260_ID_EMAC);
 
@@ -108,6 +110,8 @@ static void at91sam9260ek_macb_hw_init(void)
 	       pin_to_mask(AT91_PIN_PA28),
 	       pin_to_controller(AT91_PIN_PA0) + PIO_PUDR);
 
+	rstc = at91_sys_read(AT91_RSTC_MR) & AT91_RSTC_ERSTL;
+
 	/* Need to reset PHY -> 500ms reset */
 	at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY |
 				     (AT91_RSTC_ERSTL & (0x0D << 8)) |
@@ -120,7 +124,7 @@ static void at91sam9260ek_macb_hw_init(void)
 
 	/* Restore NRST value */
 	at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY |
-				     (AT91_RSTC_ERSTL & (0x0 << 8)) |
+				     (rstc) |
 				     AT91_RSTC_URSTEN);
 
 	/* Re-enable pull-up */

board/atmel/at91sam9263ek/at91sam9263ek.c

@@ -91,6 +91,8 @@ static void at91sam9263ek_nand_hw_init(void)
 #ifdef CONFIG_MACB
 static void at91sam9263ek_macb_hw_init(void)
 {
+	unsigned long rstc;
+
 	/* Enable clock */
 	at91_sys_write(AT91_PMC_PCER, 1 << AT91SAM9263_ID_EMAC);
 
@@ -108,6 +110,8 @@ static void at91sam9263ek_macb_hw_init(void)
 	       pin_to_mask(AT91_PIN_PE26),
 	       pin_to_controller(AT91_PIN_PE0) + PIO_PUDR);
 
+	rstc = at91_sys_read(AT91_RSTC_MR) & AT91_RSTC_ERSTL;
+
 	/* Need to reset PHY -> 500ms reset */
 	at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY |
 				     (AT91_RSTC_ERSTL & (0x0D << 8)) |
@@ -120,7 +124,7 @@ static void at91sam9263ek_macb_hw_init(void)
 
 	/* Restore NRST value */
 	at91_sys_write(AT91_RSTC_MR, AT91_RSTC_KEY |
-				     (AT91_RSTC_ERSTL & (0x0 << 8)) |
+				     (rstc) |
 				     AT91_RSTC_URSTEN);
 
 	/* Re-enable pull-up */