davinci: MityDSP-L138/MityARM-1808 read MAC address from I2C Prom

For the MityDSP-L138/MityARM-1808 SOMS, read the factory assigned
MAC address from the onboard I2C EPROM and assign it to the emac
device during platform initialization.

Signed-off-by: Michael Williamson <michael.williamson@criticallink.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 62 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/board-mityomapl138.c b/arch/arm/mach-davinci/board-mityomapl138.c
index 6f12a182333b..65f7501984db 100644
--- a/arch/arm/mach-davinci/board-mityomapl138.c
+++ b/arch/arm/mach-davinci/board-mityomapl138.c
@@ -15,6 +15,8 @@
 #include <linux/mtd/partitions.h>
 #include <linux/regulator/machine.h>
 #include <linux/i2c.h>
+#include <linux/i2c/at24.h>
+#include <linux/etherdevice.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -25,6 +27,65 @@
 #include <mach/mux.h>
 
 #define MITYOMAPL138_PHY_ID             "0:03"
+
+#define FACTORY_CONFIG_MAGIC    0x012C0138
+#define FACTORY_CONFIG_VERSION  0x00010001
+
+/* Data Held in On-Board I2C device */
+struct factory_config {
+        u32     magic;
+        u32     version;
+        u8      mac[6];
+        u32     fpga_type;
+        u32     spare;
+        u32     serialnumber;
+        char    partnum[32];
+};
+
+static struct factory_config factory_config;
+
+static void read_factory_config(struct memory_accessor *a, void *context)
+{
+        int ret;
+        struct davinci_soc_info *soc_info = &davinci_soc_info;
+
+        ret = a->read(a, (char *)&factory_config, 0, sizeof(factory_config));
+        if (ret != sizeof(struct factory_config)) {
+                pr_warning("MityOMAPL138: Read Factory Config Failed: %d\n",
+                                ret);
+                return;
+        }
+
+        if (factory_config.magic != FACTORY_CONFIG_MAGIC) {
+                pr_warning("MityOMAPL138: Factory Config Magic Wrong (%X)\n",
+                                factory_config.magic);
+                return;
+        }
+
+        if (factory_config.version != FACTORY_CONFIG_VERSION) {
+                pr_warning("MityOMAPL138: Factory Config Version Wrong (%X)\n",
+                                factory_config.version);
+                return;
+        }
+
+        pr_info("MityOMAPL138: Found MAC = %pM\n", factory_config.mac);
+        pr_info("MityOMAPL138: Part Number = %s\n", factory_config.partnum);
+        if (is_valid_ether_addr(factory_config.mac))
+                memcpy(soc_info->emac_pdata->mac_addr,
+                        factory_config.mac, ETH_ALEN);
+        else
+                pr_warning("MityOMAPL138: Invalid MAC found "
+                                "in factory config block\n");
+}
+
+static struct at24_platform_data mityomapl138_fd_chip = {
+        .byte_len       = 256,
+        .page_size      = 8,
+        .flags          = AT24_FLAG_READONLY | AT24_FLAG_IRUGO,
+        .setup          = read_factory_config,
+        .context        = NULL,
+};
+
 static struct davinci_i2c_platform_data mityomap_i2c_0_pdata = {
         .bus_freq       = 100,  /* kHz */
         .bus_delay      = 0,    /* usec */
@@ -151,6 +212,7 @@ static struct i2c_board_info __initdata mityomap_tps65023_info[] = {
         },
         {
                 I2C_BOARD_INFO("24c02", 0x50),
+                .platform_data = &mityomapl138_fd_chip,
         },
 };