drivers/net/wireless/ath/ath5k/ahb.c - arm/linux - Git at Google

 /*
  * Copyright (c) 2008-2009 Atheros Communications Inc.
  * Copyright (c) 2009 Gabor Juhos <juhosg@openwrt.org>
  * Copyright (c) 2009 Imre Kaloz <kaloz@openwrt.org>
  *
  * 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 <linux/nl80211.h>
 #include <linux/platform_device.h>
 #include <linux/etherdevice.h>
 #include <ar231x_platform.h>
 #include "ath5k.h"
 #include "debug.h"
 #include "base.h"
 #include "reg.h"

 /* return bus cachesize in 4B word units */
 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
 {
 	*csz = L1_CACHE_BYTES >> 2;
 }

 static bool
 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
 {
 	struct ath5k_hw *ah = common->priv;
 	struct platform_device *pdev = to_platform_device(ah->dev);
 	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 	u16 *eeprom, *eeprom_end;


 	bcfg = pdev->dev.platform_data;
 	eeprom = (u16 *) bcfg->radio;
 	eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;

 	eeprom += off;
 	if (eeprom > eeprom_end)
 		return false;

 	*data = *eeprom;
 	return true;
 }

 int ath5k_hw_read_srev(struct ath5k_hw *ah)
 {
 	struct platform_device *pdev = to_platform_device(ah->dev);
 	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 	ah->ah_mac_srev = bcfg->devid;
 	return 0;
 }

 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
 {
 	struct platform_device *pdev = to_platform_device(ah->dev);
 	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 	u8 *cfg_mac;

 	if (to_platform_device(ah->dev)->id == 0)
 		cfg_mac = bcfg->config->wlan0_mac;
 	else
 		cfg_mac = bcfg->config->wlan1_mac;

 	memcpy(mac, cfg_mac, ETH_ALEN);
 	return 0;
 }

 static const struct ath_bus_ops ath_ahb_bus_ops = {
 	.ath_bus_type = ATH_AHB,
 	.read_cachesize = ath5k_ahb_read_cachesize,
 	.eeprom_read = ath5k_ahb_eeprom_read,
 	.eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
 };

 /*Initialization*/
 static int ath_ahb_probe(struct platform_device *pdev)
 {
 	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 	struct ath5k_hw *ah;
 	struct ieee80211_hw *hw;
 	struct resource *res;
 	void __iomem *mem;
 	int irq;
 	int ret = 0;
 	u32 reg;

 	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");
 		ret = -ENXIO;
 		goto err_out;
 	}

 	mem = ioremap_nocache(res->start, resource_size(res));
 	if (mem == NULL) {
 		dev_err(&pdev->dev, "ioremap failed\n");
 		ret = -ENOMEM;
 		goto err_out;
 	}

 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "no IRQ resource found\n");
 		ret = -ENXIO;
 		goto err_out;
 	}

 	irq = res->start;

 	hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
 	if (hw == NULL) {
 		dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 		ret = -ENOMEM;
 		goto err_out;
 	}

 	ah = hw->priv;
 	ah->hw = hw;
 	ah->dev = &pdev->dev;
 	ah->iobase = mem;
 	ah->irq = irq;
 	ah->devid = bcfg->devid;

 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 		/* Enable WMAC AHB arbitration */
 		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 		reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);

 		/* Enable global WMAC swapping */
 		reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
 		reg |= AR5K_AR2315_BYTESWAP_WMAC;
 		iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 	} else {
 		/* Enable WMAC DMA access (assuming 5312 or 231x*/
 		/* TODO: check other platforms */
 		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 		if (to_platform_device(ah->dev)->id == 0)
 			reg |= AR5K_AR5312_ENABLE_WLAN0;
 		else
 			reg |= AR5K_AR5312_ENABLE_WLAN1;
 		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);

 		/*
 		 * On a dual-band AR5312, the multiband radio is only
 		 * used as pass-through. Disable 2 GHz support in the
 		 * driver for it
 		 */
 		if (to_platform_device(ah->dev)->id == 0 &&
 		    (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
 		     (BD_WLAN1 | BD_WLAN0))
 			ah->ah_capabilities.cap_needs_2GHz_ovr = true;
 		else
 			ah->ah_capabilities.cap_needs_2GHz_ovr = false;
 	}

 	ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
 	if (ret != 0) {
 		dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 		ret = -ENODEV;
 		goto err_free_hw;
 	}

 	platform_set_drvdata(pdev, hw);

 	return 0;

  err_free_hw:
 	ieee80211_free_hw(hw);
 	platform_set_drvdata(pdev, NULL);
  err_out:
 	return ret;
 }

 static int ath_ahb_remove(struct platform_device *pdev)
 {
 	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 	struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 	struct ath5k_hw *ah;
 	u32 reg;

 	if (!hw)
 		return 0;

 	ah = hw->priv;

 	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 		/* Disable WMAC AHB arbitration */
 		reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 		reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 		iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 	} else {
 		/*Stop DMA access */
 		reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 		if (to_platform_device(ah->dev)->id == 0)
 			reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 		else
 			reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 		iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 	}

 	ath5k_deinit_ah(ah);
 	platform_set_drvdata(pdev, NULL);
 	ieee80211_free_hw(hw);

 	return 0;
 }

 static struct platform_driver ath_ahb_driver = {
 	.probe      = ath_ahb_probe,
 	.remove     = ath_ahb_remove,
 	.driver		= {
 		.name	= "ar231x-wmac",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init
 ath5k_ahb_init(void)
 {
 	return platform_driver_register(&ath_ahb_driver);
 }

 static void __exit
 ath5k_ahb_exit(void)
 {
 	platform_driver_unregister(&ath_ahb_driver);
 }

 module_init(ath5k_ahb_init);
 module_exit(ath5k_ahb_exit);
	/*
	* Copyright (c) 2008-2009 Atheros Communications Inc.
	* Copyright (c) 2009 Gabor Juhos <juhosg@openwrt.org>
	* Copyright (c) 2009 Imre Kaloz <kaloz@openwrt.org>
	*
	* 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 <linux/nl80211.h>
	#include <linux/platform_device.h>
	#include <linux/etherdevice.h>
	#include <ar231x_platform.h>
	#include "ath5k.h"
	#include "debug.h"
	#include "base.h"
	#include "reg.h"

	/* return bus cachesize in 4B word units */
	static void ath5k_ahb_read_cachesize(struct ath_common common, int csz)
	{
	*csz = L1_CACHE_BYTES >> 2;
	}

	static bool
	ath5k_ahb_eeprom_read(struct ath_common common, u32 off, u16 data)
	{
	struct ath5k_hw *ah = common->priv;
	struct platform_device *pdev = to_platform_device(ah->dev);
	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
	u16 eeprom, eeprom_end;



	bcfg = pdev->dev.platform_data;
	eeprom = (u16 *) bcfg->radio;
	eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;

	eeprom += off;
	if (eeprom > eeprom_end)
	return false;

	data = eeprom;
	return true;
	}

	int ath5k_hw_read_srev(struct ath5k_hw *ah)
	{
	struct platform_device *pdev = to_platform_device(ah->dev);
	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
	ah->ah_mac_srev = bcfg->devid;
	return 0;
	}

	static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw ah, u8 mac)
	{
	struct platform_device *pdev = to_platform_device(ah->dev);
	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
	u8 *cfg_mac;

	if (to_platform_device(ah->dev)->id == 0)
	cfg_mac = bcfg->config->wlan0_mac;
	else
	cfg_mac = bcfg->config->wlan1_mac;

	memcpy(mac, cfg_mac, ETH_ALEN);
	return 0;
	}

	static const struct ath_bus_ops ath_ahb_bus_ops = {
	.ath_bus_type = ATH_AHB,
	.read_cachesize = ath5k_ahb_read_cachesize,
	.eeprom_read = ath5k_ahb_eeprom_read,
	.eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
	};

	/Initialization/
	static int ath_ahb_probe(struct platform_device *pdev)
	{
	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
	struct ath5k_hw *ah;
	struct ieee80211_hw *hw;
	struct resource *res;
	void __iomem *mem;
	int irq;
	int ret = 0;
	u32 reg;

	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");
	ret = -ENXIO;
	goto err_out;
	}

	mem = ioremap_nocache(res->start, resource_size(res));
	if (mem == NULL) {
	dev_err(&pdev->dev, "ioremap failed\n");
	ret = -ENOMEM;
	goto err_out;
	}

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "no IRQ resource found\n");
	ret = -ENXIO;
	goto err_out;
	}

	irq = res->start;

	hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
	if (hw == NULL) {
	dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
	ret = -ENOMEM;
	goto err_out;
	}

	ah = hw->priv;
	ah->hw = hw;
	ah->dev = &pdev->dev;
	ah->iobase = mem;
	ah->irq = irq;
	ah->devid = bcfg->devid;

	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
	/* Enable WMAC AHB arbitration */
	reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
	reg \|= AR5K_AR2315_AHB_ARB_CTL_WLAN;
	iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);

	/* Enable global WMAC swapping */
	reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
	reg \|= AR5K_AR2315_BYTESWAP_WMAC;
	iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
	} else {
	/* Enable WMAC DMA access (assuming 5312 or 231x*/
	/* TODO: check other platforms */
	reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
	if (to_platform_device(ah->dev)->id == 0)
	reg \|= AR5K_AR5312_ENABLE_WLAN0;
	else
	reg \|= AR5K_AR5312_ENABLE_WLAN1;
	iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);

	/*
	* On a dual-band AR5312, the multiband radio is only
	* used as pass-through. Disable 2 GHz support in the
	* driver for it
	*/
	if (to_platform_device(ah->dev)->id == 0 &&
	(bcfg->config->flags & (BD_WLAN0 \| BD_WLAN1)) ==
	(BD_WLAN1 \| BD_WLAN0))
	ah->ah_capabilities.cap_needs_2GHz_ovr = true;
	else
	ah->ah_capabilities.cap_needs_2GHz_ovr = false;
	}

	ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
	if (ret != 0) {
	dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
	ret = -ENODEV;
	goto err_free_hw;
	}

	platform_set_drvdata(pdev, hw);

	return 0;

	err_free_hw:
	ieee80211_free_hw(hw);
	platform_set_drvdata(pdev, NULL);
	err_out:
	return ret;
	}

	static int ath_ahb_remove(struct platform_device *pdev)
	{
	struct ar231x_board_config *bcfg = pdev->dev.platform_data;
	struct ieee80211_hw *hw = platform_get_drvdata(pdev);
	struct ath5k_hw *ah;
	u32 reg;

	if (!hw)
	return 0;

	ah = hw->priv;

	if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
	/* Disable WMAC AHB arbitration */
	reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
	reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
	iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
	} else {
	/Stop DMA access /
	reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
	if (to_platform_device(ah->dev)->id == 0)
	reg &= ~AR5K_AR5312_ENABLE_WLAN0;
	else
	reg &= ~AR5K_AR5312_ENABLE_WLAN1;
	iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
	}

	ath5k_deinit_ah(ah);
	platform_set_drvdata(pdev, NULL);
	ieee80211_free_hw(hw);

	return 0;
	}

	static struct platform_driver ath_ahb_driver = {
	.probe = ath_ahb_probe,
	.remove = ath_ahb_remove,
	.driver = {
	.name = "ar231x-wmac",
	.owner = THIS_MODULE,
	},
	};

	static int __init
	ath5k_ahb_init(void)
	{
	return platform_driver_register(&ath_ahb_driver);
	}

	static void __exit
	ath5k_ahb_exit(void)
	{
	platform_driver_unregister(&ath_ahb_driver);
	}

	module_init(ath5k_ahb_init);
	module_exit(ath5k_ahb_exit);