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 <linux/etherdevice.h>
  22 #include <ar231x_platform.h>
  23 #include "ath5k.h"
  24 #include "debug.h"
  25 #include "base.h"
  26 #include "reg.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 int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
  66 {
  67         struct ath5k_softc *sc = ah->ah_sc;
  68         struct platform_device *pdev = to_platform_device(sc->dev);
  69         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  70         u8 *cfg_mac;
  71
  72         if (to_platform_device(sc->dev)->id == 0)
  73                 cfg_mac = bcfg->config->wlan0_mac;
  74         else
  75                 cfg_mac = bcfg->config->wlan1_mac;
  76
  77         memcpy(mac, cfg_mac, ETH_ALEN);
  78         return 0;
  79 }
  80
  81 static const struct ath_bus_ops ath_ahb_bus_ops = {
  82         .ath_bus_type = ATH_AHB,
  83         .read_cachesize = ath5k_ahb_read_cachesize,
  84         .eeprom_read = ath5k_ahb_eeprom_read,
  85         .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
  86 };
  87
  88 /*Initialization*/
  89 static int ath_ahb_probe(struct platform_device *pdev)
  90 {
  91         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  92         struct ath5k_softc *sc;
  93         struct ieee80211_hw *hw;
  94         struct resource *res;
  95         void __iomem *mem;
  96         int irq;
  97         int ret = 0;
  98         u32 reg;
  99
 100         if (!pdev->dev.platform_data) {
 101                 dev_err(&pdev->dev, "no platform data specified\n");
 102                 ret = -EINVAL;
 103                 goto err_out;
 104         }
 105
 106         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 107         if (res == NULL) {
 108                 dev_err(&pdev->dev, "no memory resource found\n");
 109                 ret = -ENXIO;
 110                 goto err_out;
 111         }
 112
 113         mem = ioremap_nocache(res->start, resource_size(res));
 114         if (mem == NULL) {
 115                 dev_err(&pdev->dev, "ioremap failed\n");
 116                 ret = -ENOMEM;
 117                 goto err_out;
 118         }
 119
 120         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 121         if (res == NULL) {
 122                 dev_err(&pdev->dev, "no IRQ resource found\n");
 123                 ret = -ENXIO;
 124                 goto err_out;
 125         }
 126
 127         irq = res->start;
 128
 129         hw = ieee80211_alloc_hw(sizeof(struct ath5k_softc), &ath5k_hw_ops);
 130         if (hw == NULL) {
 131                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 132                 ret = -ENOMEM;
 133                 goto err_out;
 134         }
 135
 136         sc = hw->priv;
 137         sc->hw = hw;
 138         sc->dev = &pdev->dev;
 139         sc->iobase = mem;
 140         sc->irq = irq;
 141         sc->devid = bcfg->devid;
 142
 143         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 144                 /* Enable WMAC AHB arbitration */
 145                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 146                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 147                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 148
 149                 /* Enable global WMAC swapping */
 150                 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
 151                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 152                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 153         } else {
 154                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 155                 /* TODO: check other platforms */
 156                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 157                 if (to_platform_device(sc->dev)->id == 0)
 158                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 159                 else
 160                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 161                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 162
 163                 /*
 164                  * On a dual-band AR5312, the multiband radio is only
 165                  * used as pass-through. Disable 2 GHz support in the
 166                  * driver for it
 167                  */
 168                 if (to_platform_device(sc->dev)->id == 0 &&
 169                     (bcfg->config->flags & (BD_WLAN0|BD_WLAN1)) ==
 170                      (BD_WLAN1|BD_WLAN0))
 171                         __set_bit(ATH_STAT_2G_DISABLED, sc->status);
 172         }
 173
 174         ret = ath5k_init_softc(sc, &ath_ahb_bus_ops);
 175         if (ret != 0) {
 176                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 177                 ret = -ENODEV;
 178                 goto err_free_hw;
 179         }
 180
 181         platform_set_drvdata(pdev, hw);
 182
 183         return 0;
 184
 185  err_free_hw:
 186         ieee80211_free_hw(hw);
 187         platform_set_drvdata(pdev, NULL);
 188  err_out:
 189         return ret;
 190 }
 191
 192 static int ath_ahb_remove(struct platform_device *pdev)
 193 {
 194         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 195         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 196         struct ath5k_softc *sc;
 197         u32 reg;
 198
 199         if (!hw)
 200                 return 0;
 201
 202         sc = hw->priv;
 203
 204         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 205                 /* Disable WMAC AHB arbitration */
 206                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 207                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 208                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 209         } else {
 210                 /*Stop DMA access */
 211                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 212                 if (to_platform_device(sc->dev)->id == 0)
 213                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 214                 else
 215                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 216                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 217         }
 218
 219         ath5k_deinit_softc(sc);
 220         platform_set_drvdata(pdev, NULL);
 221
 222         return 0;
 223 }
 224
 225 static struct platform_driver ath_ahb_driver = {
 226         .probe      = ath_ahb_probe,
 227         .remove     = ath_ahb_remove,
 228         .driver         = {
 229                 .name   = "ar231x-wmac",
 230                 .owner  = THIS_MODULE,
 231         },
 232 };
 233
 234 static int __init
 235 ath5k_ahb_init(void)
 236 {
 237         return platform_driver_register(&ath_ahb_driver);
 238 }
 239
 240 static void __exit
 241 ath5k_ahb_exit(void)
 242 {
 243         platform_driver_unregister(&ath_ahb_driver);
 244 }
 245
 246 module_init(ath5k_ahb_init);
 247 module_exit(ath5k_ahb_exit);