lantiq: Add support for loading athxk eeproms through mtd

This patch enables retrieving the wifi calibration data from an MTD partition.
Try to copy mac address from ethernet before generating a random one.
This fixes DGN3500 ath9k support.

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

SVN-Revision: 37087

2 files changed, 85 insertions, 31 deletions

diff --git a/target/linux/lantiq/dts/DGN3500.dtsi b/target/linux/lantiq/dts/DGN3500.dtsi
index b2fb269..9233b10 100644
--- a/target/linux/lantiq/dts/DGN3500.dtsi
+++ b/target/linux/lantiq/dts/DGN3500.dtsi
@@ -116,6 +116,7 @@
 		compatible = "ath9k,eeprom";
 		ath,eep-flash = <&ath9k_cal 0xf000>;
 		ath,pci-slot = <14>;
+		ath,eep-endian;
 		ath,eep-swap;
 	};
 
diff --git a/target/linux/lantiq/patches-3.8/0037-owrt-lantiq-wifi-and-ethernet-eeprom-handling.patch b/target/linux/lantiq/patches-3.8/0037-owrt-lantiq-wifi-and-ethernet-eeprom-handling.patch
index 3d64c78..e98a4c0 100644
--- a/target/linux/lantiq/patches-3.8/0037-owrt-lantiq-wifi-and-ethernet-eeprom-handling.patch
+++ b/target/linux/lantiq/patches-3.8/0037-owrt-lantiq-wifi-and-ethernet-eeprom-handling.patch
@@ -50,12 +50,13 @@ Subject: [PATCH 37/40] owrt: lantiq: wifi and ethernet eeprom handling
  obj-$(CONFIG_XRX200_PHY_FW) += xrx200_phy_fw.o
 --- /dev/null
 +++ b/arch/mips/lantiq/xway/ath_eep.c
-@@ -0,0 +1,195 @@
+@@ -0,0 +1,248 @@
 +/*
 + *  Copyright (C) 2011 Luca Olivetti <luca@ventoso.org>
 + *  Copyright (C) 2011 John Crispin <blogic@openwrt.org>
 + *  Copyright (C) 2011 Andrej Vlašić <andrej.vlasic0@gmail.com>
 + *  Copyright (C) 2013 Álvaro Fernández Rojas <noltari@gmail.com>
++ *  Copyright (C) 2013 Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
 + *
 + *  This program is free software; you can redistribute it and/or modify it
 + *  under the terms of the GNU General Public License version 2 as published
@@ -69,7 +70,10 @@ Subject: [PATCH 37/40] owrt: lantiq: wifi and ethernet eeprom handling
 +#include <linux/ath5k_platform.h>
 +#include <linux/ath9k_platform.h>
 +#include <linux/pci.h>
++#include <linux/err.h>
++#include <linux/mtd/mtd.h>
 +#include <pci-ath-fixup.h>
++#include <lantiq_soc.h>
 +
 +extern int (*ltq_pci_plat_dev_init)(struct pci_dev *dev);
 +struct ath5k_platform_data ath5k_pdata;
@@ -86,28 +90,50 @@ Subject: [PATCH 37/40] owrt: lantiq: wifi and ethernet eeprom handling
 +
 +int __init of_ath9k_eeprom_probe(struct platform_device *pdev)
 +{
-+	struct device_node *np = pdev->dev.of_node;
-+	struct resource *eep_res, *mac_res;
++	struct device_node *np = pdev->dev.of_node, *mtd_np;
++	struct resource *eep_res, *mac_res = NULL;
 +	void __iomem *eep, *mac;
 +	int mac_offset;
 +	u32 mac_inc = 0, pci_slot = 0;
 +	int i;
++	struct mtd_info *the_mtd;
++	size_t flash_readlen;
++	const __be32 *list;
++	const char *part;
++	phandle phandle;
++
++	if ((list = of_get_property(np, "ath,eep-flash", &i)) && i == 2 *
++			sizeof(*list) && (phandle = be32_to_cpup(list++)) &&
++			(mtd_np = of_find_node_by_phandle(phandle)) && ((part =
++			of_get_property(mtd_np, "label", NULL)) || (part =
++			mtd_np->name)) && (the_mtd = get_mtd_device_nm(part))
++			!= ERR_PTR(-ENODEV)) {
++		i = mtd_read(the_mtd, be32_to_cpup(list),
++				ATH9K_PLAT_EEP_MAX_WORDS << 1, &flash_readlen,
++				(void *) ath9k_pdata.eeprom_data);
++		put_mtd_device(the_mtd);
++		if ((sizeof(ath9k_pdata.eeprom_data) != flash_readlen) || i) {
++			dev_err(&pdev->dev, "failed to load eeprom from mtd\n");
++			return -ENODEV;
++		}
++	} else {
++		eep_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++		mac_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 +
-+	eep_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+	mac_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
++		if (!eep_res) {
++			dev_err(&pdev->dev, "failed to load eeprom address\n");
++			return -ENODEV;
++		}
++		if (resource_size(eep_res) != ATH9K_PLAT_EEP_MAX_WORDS << 1) {
++			dev_err(&pdev->dev, "eeprom has an invalid size\n");
++			return -EINVAL;
++		}
 +
-+	if (!eep_res) {
-+		dev_err(&pdev->dev, "failed to load eeprom address\n");
-+		return -ENODEV;
-+	}
-+	if (resource_size(eep_res) != ATH9K_PLAT_EEP_MAX_WORDS << 1) {
-+		dev_err(&pdev->dev, "eeprom has an invalid size\n");
-+		return -EINVAL;
++		eep = ioremap(eep_res->start, resource_size(eep_res));
++		memcpy_fromio(ath9k_pdata.eeprom_data, eep,
++				ATH9K_PLAT_EEP_MAX_WORDS << 1);
 +	}
 +
-+	eep = ioremap(eep_res->start, resource_size(eep_res));
-+	memcpy_fromio(ath9k_pdata.eeprom_data, eep, ATH9K_PLAT_EEP_MAX_WORDS << 1);
-+
 +	if (of_find_property(np, "ath,eep-swap", NULL))
 +		for (i = 0; i < ATH9K_PLAT_EEP_MAX_WORDS; i++)
 +			ath9k_pdata.eeprom_data[i] = swab16(ath9k_pdata.eeprom_data[i]);
@@ -127,7 +153,9 @@ Subject: [PATCH 37/40] owrt: lantiq: wifi and ethernet eeprom handling
 +		}
 +		mac = ioremap(mac_res->start, resource_size(mac_res));
 +		memcpy_fromio(athxk_eeprom_mac, mac, 6);
-+	} else {
++	} else if (ltq_get_eth_mac())
++		memcpy(athxk_eeprom_mac, ltq_get_eth_mac(), 6);
++	else {
 +		dev_warn(&pdev->dev, "using random mac\n");
 +		random_ether_addr(athxk_eeprom_mac);
 +	}
@@ -177,28 +205,51 @@ Subject: [PATCH 37/40] owrt: lantiq: wifi and ethernet eeprom handling
 +
 +int __init of_ath5k_eeprom_probe(struct platform_device *pdev)
 +{
-+	struct device_node *np = pdev->dev.of_node;
-+	struct resource *eep_res, *mac_res;
++	struct device_node *np = pdev->dev.of_node, *mtd_np;
++	struct resource *eep_res, *mac_res = NULL;
 +	void __iomem *eep, *mac;
 +	int mac_offset;
 +	u32 mac_inc = 0;
 +	int i;
++	struct mtd_info *the_mtd;
++	size_t flash_readlen;
++	const __be32 *list;
++	const char *part;
++	phandle phandle;
++
++	if ((list = of_get_property(np, "ath,eep-flash", &i)) && i == 2 *
++			sizeof(*list) && (phandle = be32_to_cpup(list++)) &&
++			(mtd_np = of_find_node_by_phandle(phandle)) && ((part =
++			of_get_property(mtd_np, "label", NULL)) || (part =
++			mtd_np->name)) && (the_mtd = get_mtd_device_nm(part))
++			!= ERR_PTR(-ENODEV)) {
++		i = mtd_read(the_mtd, be32_to_cpup(list),
++				ATH5K_PLAT_EEP_MAX_WORDS << 1, &flash_readlen,
++				(void *) ath5k_pdata.eeprom_data);
++		put_mtd_device(the_mtd);
++		if ((sizeof(ATH5K_PLAT_EEP_MAX_WORDS << 1) != flash_readlen)
++				|| i) {
++			dev_err(&pdev->dev, "failed to load eeprom from mtd\n");
++			return -ENODEV;
++		}
++	} else {
++		eep_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++		mac_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 +
-+	eep_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+	mac_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
++		if (!eep_res) {
++			dev_err(&pdev->dev, "failed to load eeprom address\n");
++			return -ENODEV;
++		}
++		if (resource_size(eep_res) != ATH5K_PLAT_EEP_MAX_WORDS << 1) {
++			dev_err(&pdev->dev, "eeprom has an invalid size\n");
++			return -EINVAL;
++		}
 +
-+	if (!eep_res) {
-+		dev_err(&pdev->dev, "failed to load eeprom address\n");
-+		return -ENODEV;
-+	}
-+	if (resource_size(eep_res) != ATH5K_PLAT_EEP_MAX_WORDS << 1) {
-+		dev_err(&pdev->dev, "eeprom has an invalid size\n");
-+		return -EINVAL;
++		eep = ioremap(eep_res->start, resource_size(eep_res));
++		memcpy_fromio(ath5k_pdata.eeprom_data, eep,
++				ATH5K_PLAT_EEP_MAX_WORDS << 1);
 +	}
 +
-+	eep = ioremap(eep_res->start, resource_size(eep_res));
-+	memcpy_fromio(ath5k_pdata.eeprom_data, eep, ATH5K_PLAT_EEP_MAX_WORDS << 1);
-+
 +	if (of_find_property(np, "ath,eep-swap", NULL))
 +		for (i = 0; i < ATH5K_PLAT_EEP_MAX_WORDS; i++)
 +			ath5k_pdata.eeprom_data[i] = swab16(ath5k_pdata.eeprom_data[i]);
@@ -212,7 +263,9 @@ Subject: [PATCH 37/40] owrt: lantiq: wifi and ethernet eeprom handling
 +		}
 +		mac = ioremap(mac_res->start, resource_size(mac_res));
 +		memcpy_fromio(athxk_eeprom_mac, mac, 6);
-+	} else {
++	} else if (ltq_get_eth_mac())
++		memcpy(athxk_eeprom_mac, ltq_get_eth_mac(), 6);
++	else {
 +		dev_warn(&pdev->dev, "using random mac\n");
 +		random_ether_addr(athxk_eeprom_mac);
 +	}