path: root/drivers/net/wireless/ath/ath9k/eeprom_4k.c

/*
 * Copyright (c) 2008-2009 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 "hw.h"
#include "ar9002_phy.h"

static int ath9k_hw_4k_get_eeprom_ver(struct ath_hw *ah)
{
	return ((ah->eeprom.map4k.baseEepHeader.version >> 12) & 0xF);
}

static int ath9k_hw_4k_get_eeprom_rev(struct ath_hw *ah)
{
	return ((ah->eeprom.map4k.baseEepHeader.version) & 0xFFF);
}

#define SIZE_EEPROM_4K (sizeof(struct ar5416_eeprom_4k) / sizeof(u16))

static bool __ath9k_hw_4k_fill_eeprom(struct ath_hw *ah)
{
	struct ath_common *common = ath9k_hw_common(ah);
	u16 *eep_data = (u16 *)&ah->eeprom.map4k;
	int addr, eep_start_loc = 64;

	for (addr = 0; addr < SIZE_EEPROM_4K; 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_4k_fill_eeprom(struct ath_hw *ah)
{
	u16 *eep_data = (u16 *)&ah->eeprom.map4k;

	ath9k_hw_usb_gen_fill_eeprom(ah, eep_data, 64, SIZE_EEPROM_4K);

	return true;
}

static bool ath9k_hw_4k_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_4k_fill_eeprom(ah);
	else
		return __ath9k_hw_4k_fill_eeprom(ah);
}

#undef SIZE_EEPROM_4K

static int ath9k_hw_4k_check_eeprom(struct ath_hw *ah)
{
#define EEPROM_4K_SIZE (sizeof(struct ar5416_eeprom_4k) / sizeof(u16))
	struct ath_common *common = ath9k_hw_common(ah);
	struct ar5416_eeprom_4k *eep =
		(struct ar5416_eeprom_4k *) &ah->eeprom.map4k;
	u16 *eepdata, temp, magic, magic2;
	u32 sum = 0, el;
	bool need_swap = false;
	int i, addr;


	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 < EEPROM_4K_SIZE; 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.map4k.baseEepHeader.length);
	else
		el = ah->eeprom.map4k.baseEepHeader.length;

	if (el > sizeof(struct ar5416_eeprom_4k))
		el = sizeof(struct