* [PATCH v4] davinci: da850 EVM: read mac address from SPI flash
@ 2011-07-12 10:28 Rajashekhara, Sudhakar
2011-07-27 5:02 ` Nori, Sekhar
0 siblings, 1 reply; 2+ messages in thread
From: Rajashekhara, Sudhakar @ 2011-07-12 10:28 UTC (permalink / raw)
To: linux-arm-kernel
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>
---
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..e83cc86 100644
--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -115,6 +115,32 @@ static struct spi_board_info da850evm_spi_info[] = {
},
};
+#ifdef CONFIG_MTD
+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 void da850_evm_setup_mac_addr(void)
+{
+ register_mtd_user(&da850evm_spi_notifier);
+}
+#else
+static void da850_evm_setup_mac_addr(void) { }
+#endif
+
static struct mtd_partition da850_evm_norflash_partition[] = {
{
.name = "bootloaders + env",
@@ -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_setup_mac_addr();
}
#ifdef CONFIG_SERIAL_8250_CONSOLE
--
1.7.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH v4] davinci: da850 EVM: read mac address from SPI flash
2011-07-12 10:28 [PATCH v4] davinci: da850 EVM: read mac address from SPI flash Rajashekhara, Sudhakar
@ 2011-07-27 5:02 ` Nori, Sekhar
0 siblings, 0 replies; 2+ messages in thread
From: Nori, Sekhar @ 2011-07-27 5:02 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Jul 12, 2011 at 15:58:53, Rajashekhara, Sudhakar wrote:
> 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>
Its impossible to get a stable IP address on Da850 EVM without
this patch so will send for v3.1. Will also add a stable tag
while applying.
Thanks,
Sekhar
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