sunxi: Add sunxi_get_sid helper function

On sun6i the SID is stored in the pmic, rather then in the SoC itself,
add a helper function to abstract this away.

This makes our MAC address generation code also work on sun6i.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

arch/arm/cpu/armv7/sunxi/cpu_info.c

@@ -10,6 +10,7 @@
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/clock.h>
+#include <axp221.h>
 
 #ifdef CONFIG_MACH_SUN6I
 int sunxi_get_ss_bonding_id(void)
@@ -72,3 +73,21 @@ int print_cpuinfo(void)
 	return 0;
 }
 #endif
+
+int sunxi_get_sid(unsigned int *sid)
+{
+#ifdef CONFIG_MACH_SUN6I
+#ifdef CONFIG_AXP221_POWER
+	return axp221_get_sid(sid);
+#else
+	return -ENODEV;
+#endif
+#else
+	int i;
+
+	for (i = 0; i< 4; i++)
+		sid[i] = readl(SUNXI_SID_BASE + 4 * i);
+
+	return 0;
+#endif
+}

arch/arm/include/asm/arch-sunxi/cpu.h

@@ -147,6 +147,7 @@
 void sunxi_board_init(void);
 void sunxi_reset(void);
 int sunxi_get_ss_bonding_id(void);
+int sunxi_get_sid(unsigned int *sid);
 #endif /* __ASSEMBLY__ */
 
 #endif /* _CPU_H */

board/sunxi/board.c

@@ -217,22 +217,20 @@ void sunxi_board_init(void)
 #ifdef CONFIG_MISC_INIT_R
 int misc_init_r(void)
 {
-	if (!getenv("ethaddr")) {
-		uint32_t reg_val = readl(SUNXI_SID_BASE);
+	unsigned int sid[4];
 
-		if (reg_val) {
-			uint8_t mac_addr[6];
+	if (!getenv("ethaddr") && sunxi_get_sid(sid) == 0 &&
+			sid[0] != 0 && sid[3] != 0) {
+		uint8_t mac_addr[6];
 
-			mac_addr[0] = 0x02; /* Non OUI / registered MAC address */
-			mac_addr[1] = (reg_val >>  0) & 0xff;
-			reg_val = readl(SUNXI_SID_BASE + 0x0c);
-			mac_addr[2] = (reg_val >> 24) & 0xff;
-			mac_addr[3] = (reg_val >> 16) & 0xff;
-			mac_addr[4] = (reg_val >>  8) & 0xff;
-			mac_addr[5] = (reg_val >>  0) & 0xff;
+		mac_addr[0] = 0x02; /* Non OUI / registered MAC address */
+		mac_addr[1] = (sid[0] >>  0) & 0xff;
+		mac_addr[2] = (sid[3] >> 24) & 0xff;
+		mac_addr[3] = (sid[3] >> 16) & 0xff;
+		mac_addr[4] = (sid[3] >>  8) & 0xff;
+		mac_addr[5] = (sid[3] >>  0) & 0xff;
 
-			eth_setenv_enetaddr("ethaddr", mac_addr);
-		}
+		eth_setenv_enetaddr("ethaddr", mac_addr);
 	}
 
 	return 0;