path: root/drivers/net/wireless/ath/ath9k/eeprom_9287.c

/*
 * Copyright (c) 2008-2011 Atheros Communications Inc.
 *
 * 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.
 */

#include <asm/unaligned.h>
#include "hw.h"
#include "ar9002_phy.h"

#define SIZE_EEPROM_AR9287 (sizeof(struct ar9287_eeprom) / sizeof(u16))

static int ath9k_hw_ar9287_get_eeprom_ver(struct ath_hw *ah)
{
	return (ah->eeprom.map9287.baseEepHeader.version >> 12) & 0xF;
}

static int ath9k_hw_ar9287_get_eeprom_rev(struct ath_hw *ah)
{
	return (ah->eeprom.map9287.baseEepHeader.version) & 0xFFF;
}

static bool __ath9k_hw_ar9287_fill_eeprom(struct ath_hw *ah)
{
	struct ar9287_eeprom *eep = &ah->eeprom.map9287;
	struct ath_common *common = ath9k_hw_common(ah);
	u16 *eep_data;
	int addr, eep_start_loc = AR9287_EEP_START_LOC;
	eep_data = (u16 *)eep;

	for (addr = 0; addr < SIZE_EEPROM_AR9287; addr++) {
		if (!ath9k_hw_nvram_read(common, addr + eep_start_loc,
					 eep_data)) {
			ath_dbg(common, ATH_DBG_EEPROM,
				"Unable to read eeprom region\n");
			return false;
		}
		eep_data++;
	}

	return true;
}

static bool __ath9k_hw_usb_ar9287_fill_eeprom(struct ath_hw *ah)
{
	u16 *eep_data = (u16 *)&ah->eeprom.map9287;

	ath9k_hw_usb_gen_fill_eeprom(ah, eep_data,
				     AR9287_HTC_EEP_START_LOC,
				     SIZE_EEPROM_AR9287);
	return true;
}

static bool ath9k_hw_ar9287_fill_eeprom(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);

	if (!ath9k_hw_use_flash(ah)) {
		ath_dbg(common, ATH_DBG_EEPROM,
			"Reading from EEPROM, not flash\n");
	}

	if (common->bus_ops->ath_bus_type == ATH_USB)
		return __ath9k_hw_usb_ar9287_fill_eeprom(ah);
	else
		return __ath9k_hw_ar9287_fill_eeprom(ah);
}

static int ath9k_hw_ar9287_check_eeprom(struct ath_hw *ah)
{
	u32 sum = 0, el, integer;
	u16 temp, word, magic, magic2, *eepdata;
	int i, addr;
	bool need_swap = false;
	struct ar9287_eeprom *eep = &ah->eeprom.map9287;
	struct ath_common *common = ath9k_hw_common(ah);

	if (!ath9k_hw_use_flash(ah)) {
		if (!ath9k_hw_nvram_read(common, AR5416_EEPROM_MAGIC_OFFSET,
					 &magic)) {
			ath_err(common, "Reading Magic # failed\n");
			return false;
		}

		ath_dbg(common, ATH_DBG_EEPROM,
			"Read Magic = 0x%04X\n", magic);

		if (magic != AR5416_EEPROM_MAGIC) {
			magic2 = swab16(magic);

			if (magic2 == AR5416_EEPROM_MAGIC) {
				need_swap = true;
				eepdata = (u16 *)(&ah->eeprom);

				for (addr = 0; addr < SIZE_EEPROM_AR9287; addr++) {
					temp = swab16(*eepdata);
					*eepdata = temp;
					eepdata++;
				}
			} else {
				ath_err(common,
					"Invalid EEPROM Magic. Endianness mismatch.\n");
				return -EINVAL;
			}
		}
	}

	ath_dbg(common, ATH_DBG_EEPROM, "need_swap = %s.\n",
		need_swap ? "True" : "False");

	if (need_swap)
		el = swab16(ah->eeprom.map9287.baseEepHeader.length);
	else
		el = ah->eeprom.map9287.baseEepHeader.length;

	if (el > sizeof(struct ar9287_eeprom))
		el = sizeof(struct ar9287_eeprom) / sizeof(u16);
	else
		el = el / sizeof(u16);

	eepdata = (u16 *)(&ah-><