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 <[e-mail]>
Signed-off-by: Imre Kaloz <[e-mail]>
Tested-by: Pavel Roskin <[e-mail]>
Signed-off-by: John W. Linville <[e-mail]>

drivers/net/wireless/ath9k/ahb.c

···
 
 #include <linux/nl80211.h>
 #include <linux/platform_device.h>
+#include <linux/ath9k_platform.h>
 #include "core.h"
 #include "reg.h"
 #include "hw.h"
···
 	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)
···
 	int irq;
 	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) {

drivers/net/wireless/ath9k/core.h

···
 struct ath_bus_ops {
 	void		(*read_cachesize)(struct ath_softc *sc, int *csz);
 	void		(*cleanup)(struct ath_softc *sc);
+	bool		(*eeprom_read)(struct ath_hal *ah, u32 off, u16 *data);
 };
 
 struct ath_softc {

drivers/net/wireless/ath9k/eeprom.c

···
 	return false;
 }
 
-static bool ath9k_hw_eeprom_read(struct ath_hal *ah, u32 off, u16 *data)
-{
-	(void)REG_READ(ah, AR5416_EEPROM_OFFSET + (off << AR5416_EEPROM_S));
-
-	if (!ath9k_hw_wait(ah,
-			   AR_EEPROM_STATUS_DATA,
-			   AR_EEPROM_STATUS_DATA_BUSY |
-			   AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0)) {
-		return false;
-	}
-
-	*data = MS(REG_READ(ah, AR_EEPROM_STATUS_DATA),
-		   AR_EEPROM_STATUS_DATA_VAL);
-
-	return true;
-}
-
-static int ath9k_hw_flash_map(struct ath_hal *ah)
-{
-	struct ath_hal_5416 *ahp = AH5416(ah);
-
-	ahp->ah_cal_mem = ioremap(AR5416_EEPROM_START_ADDR, AR5416_EEPROM_MAX);
-
-	if (!ahp->ah_cal_mem) {
-		DPRINTF(ah->ah_sc, ATH_DBG_EEPROM,
-			"cannot remap eeprom region \n");
-		return -EIO;
-	}
-
-	return 0;
-}
-
-static bool ath9k_hw_flash_read(struct ath_hal *ah, u32 off, u16 *data)
-{
-	struct ath_hal_5416 *ahp = AH5416(ah);
-
-	*data = ioread16(ahp->ah_cal_mem + off);
-
-	return true;
-}
-
 static inline bool ath9k_hw_nvram_read(struct ath_hal *ah, u32 off, u16 *data)
 {
-	if (ath9k_hw_use_flash(ah))
-		return ath9k_hw_flash_read(ah, off, data);
-	else
-		return ath9k_hw_eeprom_read(ah, off, data);
+	struct ath_softc *sc = ah->ah_sc;
+
+	return sc->bus_ops->eeprom_read(ah, off, data);
 }
 
 static bool ath9k_hw_fill_4k_eeprom(struct ath_hal *ah)
···
 {
 	int status;
 	struct ath_hal_5416 *ahp = AH5416(ah);
-
-	if (ath9k_hw_use_flash(ah))
-		ath9k_hw_flash_map(ah);
 
 	if (AR_SREV_9285(ah))
 		ahp->ah_eep_map = EEP_MAP_4KBITS;

drivers/net/wireless/ath9k/pci.c

···
 	pci_disable_device(pdev);
 }
 
+static bool ath_pci_eeprom_read(struct ath_hal *ah, u32 off, u16 *data)
+{
+	(void)REG_READ(ah, AR5416_EEPROM_OFFSET + (off << AR5416_EEPROM_S));
+
+	if (!ath9k_hw_wait(ah,
+			   AR_EEPROM_STATUS_DATA,
+			   AR_EEPROM_STATUS_DATA_BUSY |
+			   AR_EEPROM_STATUS_DATA_PROT_ACCESS, 0)) {
+		return false;
+	}
+
+	*data = MS(REG_READ(ah, AR_EEPROM_STATUS_DATA),
+		   AR_EEPROM_STATUS_DATA_VAL);
+
+	return true;
+}
+
 static struct ath_bus_ops ath_pci_bus_ops = {
 	.read_cachesize = ath_pci_read_cachesize,
 	.cleanup = ath_pci_cleanup,
+	.eeprom_read = ath_pci_eeprom_read,
 };
 
 static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)

include/linux/ath9k_platform.h

···
+/*
+ * Copyright (c) 2008 Atheros Communications Inc.
+ * Copyright (c) 2009 Gabor Juhos <[e-mail]>
+ * Copyright (c) 2009 Imre Kaloz <[e-mail]>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _LINUX_ATH9K_PLATFORM_H
+#define _LINUX_ATH9K_PLATFORM_H
+
+#define ATH9K_PLAT_EEP_MAX_WORDS	2048
+
+struct ath9k_platform_data {
+	u16 eeprom_data[ATH9K_PLAT_EEP_MAX_WORDS];
+};
+
+#endif /* _LINUX_ATH9K_PLATFORM_H */