linux-kernel - [016/101] ARM: davinci: da850 EVM: read mac address from SPI flash

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Message-Id: <20111102222741.125978934@clark.kroah.org>
Date:	Wed, 02 Nov 2011 15:26:00 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Sudhakar Rajashekhara <sudhakar.raj@...com>,
	Sekhar Nori <nsekhar@...com>
Subject: [016/101] ARM: davinci: da850 EVM: read mac address from SPI flash

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Sudhakar Rajashekhara <sudhakar.raj@...com>

commit 810198bc9c109489dfadc57131c5183ce6ad2d7d upstream.

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: Sudhakar Rajashekhara <sudhakar.raj@...com>
Signed-off-by: Sekhar Nori <nsekhar@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/arm/mach-davinci/board-da850-evm.c |   28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

--- a/arch/arm/mach-davinci/board-da850-evm.c
+++ b/arch/arm/mach-davinci/board-da850-evm.c
@@ -44,6 +44,32 @@

 #define DA850_MII_MDIO_CLKEN_PIN	GPIO_TO_PIN(2, 6)

+#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           = "NOR filesystem",
@@ -696,6 +722,8 @@ static __init void da850_evm_init(void)
 	if (ret)
 		pr_warning("da850_evm_init: cpuidle registration failed: %d\n",
 				ret);
+
+	da850_evm_setup_mac_addr();
 }

 #ifdef CONFIG_SERIAL_8250_CONSOLE

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