drivers/net/wireless/ath/ath5k/ahb.c

   1 /*
   2  * Copyright (c) 2008-2009 Atheros Communications Inc.
   3  * Copyright (c) 2009 Gabor Juhos <juhosg@openwrt.org>
   4  * Copyright (c) 2009 Imre Kaloz <kaloz@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <linux/nl80211.h>
  20 #include <linux/platform_device.h>
  21 #include <ar231x_platform.h>
  22 #include "ath5k.h"
  23 #include "debug.h"
  24 #include "base.h"
  25 #include "reg.h"
  26 #include "debug.h"
  27
  28 /* return bus cachesize in 4B word units */
  29 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
  30 {
  31         *csz = L1_CACHE_BYTES >> 2;
  32 }
  33
  34 static bool
  35 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  36 {
  37         struct ath5k_softc *sc = common->priv;
  38         struct platform_device *pdev = to_platform_device(sc->dev);
  39         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  40         u16 *eeprom, *eeprom_end;
  41
  42
  43
  44         bcfg = pdev->dev.platform_data;
  45         eeprom = (u16 *) bcfg->radio;
  46         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
  47
  48         eeprom += off;
  49         if (eeprom > eeprom_end)
  50                 return false;
  51
  52         *data = *eeprom;
  53         return true;
  54 }
  55
  56 int ath5k_hw_read_srev(struct ath5k_hw *ah)
  57 {
  58         struct ath5k_softc *sc = ah->ah_sc;
  59         struct platform_device *pdev = to_platform_device(sc->dev);
  60         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  61         ah->ah_mac_srev = bcfg->devid;
  62         return 0;
  63 }
  64
  65 static const struct ath_bus_ops ath_ahb_bus_ops = {
  66         .ath_bus_type = ATH_AHB,
  67         .read_cachesize = ath5k_ahb_read_cachesize,
  68         .eeprom_read = ath5k_ahb_eeprom_read,
  69 };
  70
  71 /*Initialization*/
  72 static int ath_ahb_probe(struct platform_device *pdev)
  73 {
  74         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  75         struct ath5k_softc *sc;
  76         struct ieee80211_hw *hw;
  77         struct resource *res;
  78         void __iomem *mem;
  79         int irq;
  80         int ret = 0;
  81         u32 reg;
  82
  83         if (!pdev->dev.platform_data) {
  84                 dev_err(&pdev->dev, "no platform data specified\n");
  85                 ret = -EINVAL;
  86                 goto err_out;
  87         }
  88
  89         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  90         if (res == NULL) {
  91                 dev_err(&pdev->dev, "no memory resource found\n");
  92                 ret = -ENXIO;
  93                 goto err_out;
  94         }
  95
  96         mem = ioremap_nocache(res->start, resource_size(res));
  97         if (mem == NULL) {
  98                 dev_err(&pdev->dev, "ioremap failed\n");
  99                 ret = -ENOMEM;
 100                 goto err_out;
 101         }
 102
 103         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 104         if (res == NULL) {
 105                 dev_err(&pdev->dev, "no IRQ resource found\n");
 106                 ret = -ENXIO;
 107                 goto err_out;
 108         }
 109
 110         irq = res->start;
 111
 112         hw = ieee80211_alloc_hw(sizeof(struct ath5k_softc), &ath5k_hw_ops);
 113         if (hw == NULL) {
 114                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 115                 ret = -ENOMEM;
 116                 goto err_out;
 117         }
 118
 119         sc = hw->priv;
 120         sc->hw = hw;
 121         sc->dev = &pdev->dev;
 122         sc->iobase = mem;
 123         sc->irq = irq;
 124         sc->devid = bcfg->devid;
 125
 126         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 127                 /* Enable WMAC AHB arbitration */
 128                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 129                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 130                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 131
 132                 /* Enable global WMAC swapping */
 133                 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
 134                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 135                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 136         } else {
 137                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 138                 /* TODO: check other platforms */
 139                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 140                 if (to_platform_device(sc->dev)->id == 0)
 141                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 142                 else
 143                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 144                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 145         }
 146
 147         ret = ath5k_init_softc(sc, &ath_ahb_bus_ops);
 148         if (ret != 0) {
 149                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 150                 ret = -ENODEV;
 151                 goto err_free_hw;
 152         }
 153
 154         platform_set_drvdata(pdev, hw);
 155
 156         return 0;
 157
 158  err_free_hw:
 159         ieee80211_free_hw(hw);
 160         platform_set_drvdata(pdev, NULL);
 161  err_out:
 162         return ret;
 163 }
 164
 165 static int ath_ahb_remove(struct platform_device *pdev)
 166 {
 167         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 168         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 169         struct ath5k_softc *sc;
 170         u32 reg;
 171
 172         if (!hw)
 173                 return 0;
 174
 175         sc = hw->priv;
 176
 177         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 178                 /* Disable WMAC AHB arbitration */
 179                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 180                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 181                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 182         } else {
 183                 /*Stop DMA access */
 184                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 185                 if (to_platform_device(sc->dev)->id == 0)
 186                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 187                 else
 188                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 189                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 190         }
 191
 192         ath5k_deinit_softc(sc);
 193         platform_set_drvdata(pdev, NULL);
 194
 195         return 0;
 196 }
 197
 198 static struct platform_driver ath_ahb_driver = {
 199         .probe      = ath_ahb_probe,
 200         .remove     = ath_ahb_remove,
 201         .driver         = {
 202                 .name   = "ar231x-wmac",
 203                 .owner  = THIS_MODULE,
 204         },
 205 };
 206
 207 static int __init
 208 ath5k_ahb_init(void)
 209 {
 210         return platform_driver_register(&ath_ahb_driver);
 211 }
 212
 213 static void __exit
 214 ath5k_ahb_exit(void)
 215 {
 216         platform_driver_unregister(&ath_ahb_driver);
 217 }
 218
 219 module_init(ath5k_ahb_init);
 220 module_exit(ath5k_ahb_exit);