ARM: davinci: da850 EVM: read mac address from SPI flash
DA850/OMAP-L138 EMAC driver uses random mac address instead of a fixed one because the mac address is not stuffed into EMAC platform data. This patch provides a function which reads the mac address stored in SPI flash (registered as MTD device) and populates the EMAC platform data. The function which reads the mac address is registered as a callback which gets called upon addition of MTD device. NOTE: In case the MAC address stored in SPI flash is erased, follow the instructions at [1] to restore it. [1] http://processors.wiki.ti.com/index.php/GSG:_OMAP-L138_DVEVM_Additional_Procedures#Restoring_MAC_address_on_SPI_Flash Modifications in v2: Guarded registering the mtd_notifier only when MTD is enabled. Earlier this was handled using mtd_has_partitions() call, but this has been removed in Linux v3.0. Modifications in v3: a. Guarded da850_evm_m25p80_notify_add() function and da850evm_spi_notifier structure with CONFIG_MTD macros. b. Renamed da850_evm_register_mtd_user() function to da850_evm_setup_mac_addr() and removed the struct mtd_notifier argument to this function. c. Passed the da850evm_spi_notifier structure to register_mtd_user() function. Modifications in v4: Moved the da850_evm_setup_mac_addr() function within the first CONFIG_MTD ifdef construct. Signed-off-by: Rajashekhara, Sudhakar <sudhakar.raj@ti.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com> Cc: stable@kernel.org
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@ -115,6 +115,32 @@ static struct spi_board_info da850evm_spi_info[] = {
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},
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};
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#ifdef CONFIG_MTD
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static void da850_evm_m25p80_notify_add(struct mtd_info *mtd)
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{
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char *mac_addr = davinci_soc_info.emac_pdata->mac_addr;
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size_t retlen;
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if (!strcmp(mtd->name, "MAC-Address")) {
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mtd->read(mtd, 0, ETH_ALEN, &retlen, mac_addr);
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if (retlen == ETH_ALEN)
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pr_info("Read MAC addr from SPI Flash: %pM\n",
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mac_addr);
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}
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}
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static struct mtd_notifier da850evm_spi_notifier = {
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.add = da850_evm_m25p80_notify_add,
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};
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static void da850_evm_setup_mac_addr(void)
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{
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register_mtd_user(&da850evm_spi_notifier);
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}
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#else
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static void da850_evm_setup_mac_addr(void) { }
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#endif
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static struct mtd_partition da850_evm_norflash_partition[] = {
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{
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.name = "bootloaders + env",
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@ -1244,6 +1270,8 @@ static __init void da850_evm_init(void)
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if (ret)
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pr_warning("da850_evm_init: sata registration failed: %d\n",
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ret);
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da850_evm_setup_mac_addr();
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}
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#ifdef CONFIG_SERIAL_8250_CONSOLE
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