From mboxrd@z Thu Jan 1 00:00:00 1970 From: sudhakar.raj@ti.com (Rajashekhara, Sudhakar) Date: Mon, 4 Jul 2011 18:37:18 +0530 Subject: [PATCH v2] davinci: da850 EVM: read mac address from SPI flash Message-ID: <1309784838-30903-1-git-send-email-sudhakar.raj@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Signed-off-by: Rajashekhara, Sudhakar --- Since v1: 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. arch/arm/mach-davinci/board-da850-evm.c | 28 ++++++++++++++++++++++++++++ 1 files changed, 28 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c index a7b41bf..f994a1f 100644 --- a/arch/arm/mach-davinci/board-da850-evm.c +++ b/arch/arm/mach-davinci/board-da850-evm.c @@ -115,6 +115,23 @@ static struct spi_board_info da850evm_spi_info[] = { }, }; +static void da850_evm_m25p80_notify_add(struct mtd_info *mtd) +{ + char *mac_addr = davinci_soc_info.emac_pdata->mac_addr; + size_t retlen; + + if (!strcmp(mtd->name, "MAC-Address")) { + mtd->read(mtd, 0, ETH_ALEN, &retlen, mac_addr); + if (retlen == ETH_ALEN) + pr_info("Read MAC addr from SPI Flash: %pM\n", + mac_addr); + } +} + +static struct mtd_notifier da850evm_spi_notifier = { + .add = da850_evm_m25p80_notify_add, +}; + static struct mtd_partition da850_evm_norflash_partition[] = { { .name = "bootloaders + env", @@ -1117,6 +1134,15 @@ static __init int da850_evm_init_cpufreq(void) static __init int da850_evm_init_cpufreq(void) { return 0; } #endif +#ifdef CONFIG_MTD +static void da850_evm_register_mtd_user(struct mtd_notifier *notify) +{ + register_mtd_user(notify); +} +#else +static void da850_evm_register_mtd_user(struct mtd_notifier *notify) { } +#endif + static __init void da850_evm_init(void) { int ret; @@ -1237,6 +1263,8 @@ static __init void da850_evm_init(void) if (ret) pr_warning("da850_evm_init: spi 1 registration failed: %d\n", ret); + + da850_evm_register_mtd_user(&da850evm_spi_notifier); } #ifdef CONFIG_SERIAL_8250_CONSOLE -- 1.7.1