ath9k: get EEPROM contents from platform data on AHB bus

On the AR913x SOCs we have to provide EEPROM contents via platform_data,
because accessing the flash via MMIO is not safe. Additionally different
boards may store the radio calibration data at different locations.

Changes-licensed-under: ISC

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/ahb.c b/drivers/net/wireless/ath9k/ahb.c
index 8cbd4c2a7fa0..7f2c3a09bcac 100644
--- a/drivers/net/wireless/ath9k/ahb.c
+++ b/drivers/net/wireless/ath9k/ahb.c
@@ -18,6 +18,7 @@
 
 #include <linux/nl80211.h>
 #include <linux/platform_device.h>
+#include <linux/ath9k_platform.h>
 #include "core.h"
 #include "reg.h"
 #include "hw.h"
@@ -33,9 +34,29 @@ static void ath_ahb_cleanup(struct ath_softc *sc)
         iounmap(sc->mem);
 }
 
+static bool ath_ahb_eeprom_read(struct ath_hal *ah, u32 off, u16 *data)
+{
+        struct ath_softc *sc = ah->ah_sc;
+        struct platform_device *pdev = to_platform_device(sc->dev);
+        struct ath9k_platform_data *pdata;
+
+        pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
+        if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
+                DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
+                        "%s: flash read failed, offset %08x is out of range\n",
+                                __func__, off);
+                return false;
+        }
+
+        *data = pdata->eeprom_data[off];
+        return true;
+}
+
 static struct ath_bus_ops ath_ahb_bus_ops  = {
         .read_cachesize = ath_ahb_read_cachesize,
         .cleanup = ath_ahb_cleanup,
+
+        .eeprom_read = ath_ahb_eeprom_read,
 };
 
 static int ath_ahb_probe(struct platform_device *pdev)
@@ -48,6 +69,12 @@ static int ath_ahb_probe(struct platform_device *pdev)
         int ret = 0;
         struct ath_hal *ah;
 
+        if (!pdev->dev.platform_data) {
+                dev_err(&pdev->dev, "no platform data specified\n");
+                ret = -EINVAL;
+                goto err_out;
+        }
+
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (res == NULL) {
                 dev_err(&pdev->dev, "no memory resource found\n");