[U-Boot] [PATCH v3 4/5] da850evm: add support to read mac address from spi flash

[manjunath.hadli at ti.com]

From: Manjunath Hadli <manjunath.hadli at ti.com>

add support to read mac address from spi flash if env variable
is not set. This is supported only on L138 boards based on da850
SOC. Introduced a macro CONFIG_MAC_ADDR_IN_SPIFLASH indicating
where to look mac address for.

Signed-off-by: Manjunathappa, Prakash <prakash.pm at ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli at ti.com>
---
 board/davinci/da8xxevm/da850evm.c |   59 +++++++++++++++++++++++++++++++++++++
 include/configs/da850_l138evm.h   |    1 +
 2 files changed, 60 insertions(+), 0 deletions(-)

diff --git a/board/davinci/da8xxevm/da850evm.c b/board/davinci/da8xxevm/da850evm.c
index 34673bf..6aa76cb 100644
--- a/board/davinci/da8xxevm/da850evm.c
+++ b/board/davinci/da8xxevm/da850evm.c
@@ -25,10 +25,13 @@
 #include <i2c.h>
 #include <net.h>
 #include <netdev.h>
+#include <spi.h>
+#include <spi_flash.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/emif_defs.h>
 #include <asm/arch/emac_defs.h>
 #include <asm/io.h>
+#include <asm/errno.h>
 #include <asm/arch/davinci_misc.h>
 #include <hwconfig.h>
 
@@ -166,6 +169,44 @@ const struct pinmux_config nor_pins[] = {
 #endif
 #endif /* CONFIG_DRIVER_TI_EMAC */
 
+#define CFG_MAC_ADDR_SPI_BUS	0
+#define CFG_MAC_ADDR_SPI_CS	0
+#define CFG_MAC_ADDR_SPI_MAX_HZ	CONFIG_SF_DEFAULT_SPEED
+#define CFG_MAC_ADDR_SPI_MODE	SPI_MODE_3
+
+#define CFG_MAC_ADDR_OFFSET	(flash->size - SZ_64K)
+
+#ifdef CONFIG_MAC_ADDR_IN_SPIFLASH
+static int get_mac_addr(u8 *addr)
+{
+	struct spi_flash *flash;
+	int ret;
+
+
+	flash = spi_flash_probe(CFG_MAC_ADDR_SPI_BUS, CFG_MAC_ADDR_SPI_CS,
+			CFG_MAC_ADDR_SPI_MAX_HZ, CFG_MAC_ADDR_SPI_MODE);
+	if (!flash) {
+		printf(" Error - unable to probe SPI flash.\n");
+		ret = -1;
+		goto err_probe;
+	}
+
+	ret = spi_flash_read(flash, CFG_MAC_ADDR_OFFSET, 6, addr);
+	if (ret) {
+		printf("Error - unable to read MAC address from SPI flash.\n");
+		goto err_read;
+	}
+
+err_read:
+	/* cannot call free currently since the free function calls free() for
+	 * spi_flash structure though it is not directly allocated through
+	 * malloc()
+	 */
+err_probe:
+	return ret;
+}
+#endif
+
 void dsp_lpsc_on(unsigned domain, unsigned int id)
 {
 	dv_reg_p mdstat, mdctl, ptstat, ptcmd;
@@ -220,7 +261,25 @@ static void dspwake(void)
 
 int misc_init_r(void)
 {
+	uchar buff[8];
+	int ret;
+
 	dspwake();
+
+#ifdef CONFIG_MAC_ADDR_IN_SPIFLASH
+	if (!eth_getenv_enetaddr("ethaddr", buff)) {
+		ret = get_mac_addr(buff);
+		if (ret != 0)
+			return -EINVAL;
+
+		if (!is_valid_ether_addr(buff)) {
+			printf("Invalid MAC address read.\n");
+			return -EINVAL;
+		}
+
+		eth_setenv_enetaddr("ethaddr", buff);
+	}
+#endif
 	return 0;
 }
 
diff --git a/include/configs/da850_l138evm.h b/include/configs/da850_l138evm.h
index 347893c..929d0a4 100644
--- a/include/configs/da850_l138evm.h
+++ b/include/configs/da850_l138evm.h
@@ -175,6 +175,7 @@
 #define CONFIG_SYS_LONGHELP
 #define CONFIG_CRC32_VERIFY
 #define CONFIG_MX_CYCLIC
+#define CONFIG_MAC_ADDR_IN_SPIFLASH
 
 /*
  * Linux Information
-- 
1.6.2.4