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 #include "debug.h"
  28
  29 /* return bus cachesize in 4B word units */
  30 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
  31 {
  32         *csz = L1_CACHE_BYTES >> 2;
  33 }
  34
  35 static bool
  36 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  37 {
  38         struct ath5k_softc *sc = common->priv;
  39         struct platform_device *pdev = to_platform_device(sc->dev);
  40         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  41         u16 *eeprom, *eeprom_end;
  42
  43
  44
  45         bcfg = pdev->dev.platform_data;
  46         eeprom = (u16 *) bcfg->radio;
  47         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
  48
  49         eeprom += off;
  50         if (eeprom > eeprom_end)
  51                 return false;
  52
  53         *data = *eeprom;
  54         return true;
  55 }
  56
  57 int ath5k_hw_read_srev(struct ath5k_hw *ah)
  58 {
  59         struct ath5k_softc *sc = ah->ah_sc;
  60         struct platform_device *pdev = to_platform_device(sc->dev);
  61         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  62         ah->ah_mac_srev = bcfg->devid;
  63         return 0;
  64 }
  65
  66 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
  67 {
  68         struct ath5k_softc *sc = ah->ah_sc;
  69         struct platform_device *pdev = to_platform_device(sc->dev);
  70         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  71         u8 *cfg_mac;
  72
  73         if (to_platform_device(sc->dev)->id == 0)
  74                 cfg_mac = bcfg->config->wlan0_mac;
  75         else
  76                 cfg_mac = bcfg->config->wlan1_mac;
  77
  78         memcpy(mac, cfg_mac, ETH_ALEN);
  79         return 0;
  80 }
  81
  82 static const struct ath_bus_ops ath_ahb_bus_ops = {
  83         .ath_bus_type = ATH_AHB,
  84         .read_cachesize = ath5k_ahb_read_cachesize,
  85         .eeprom_read = ath5k_ahb_eeprom_read,
  86         .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
  87 };
  88
  89 /*Initialization*/
  90 static int ath_ahb_probe(struct platform_device *pdev)
  91 {
  92         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  93         struct ath5k_softc *sc;
  94         struct ieee80211_hw *hw;
  95         struct resource *res;
  96         void __iomem *mem;
  97         int irq;
  98         int ret = 0;
  99         u32 reg;
 100
 101         if (!pdev->dev.platform_data) {
 102                 dev_err(&pdev->dev, "no platform data specified\n");
 103                 ret = -EINVAL;
 104                 goto err_out;
 105         }
 106
 107         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 108         if (res == NULL) {
 109                 dev_err(&pdev->dev, "no memory resource found\n");
 110                 ret = -ENXIO;
 111                 goto err_out;
 112         }
 113
 114         mem = ioremap_nocache(res->start, resource_size(res));
 115         if (mem == NULL) {
 116                 dev_err(&pdev->dev, "ioremap failed\n");
 117                 ret = -ENOMEM;
 118                 goto err_out;
 119         }
 120
 121         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 122         if (res == NULL) {
 123                 dev_err(&pdev->dev, "no IRQ resource found\n");
 124                 ret = -ENXIO;
 125                 goto err_out;
 126         }
 127
 128         irq = res->start;
 129
 130         hw = ieee80211_alloc_hw(sizeof(struct ath5k_softc), &ath5k_hw_ops);
 131         if (hw == NULL) {
 132                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 133                 ret = -ENOMEM;
 134                 goto err_out;
 135         }
 136
 137         sc = hw->priv;
 138         sc->hw = hw;
 139         sc->dev = &pdev->dev;
 140         sc->iobase = mem;
 141         sc->irq = irq;
 142         sc->devid = bcfg->devid;
 143
 144         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 145                 /* Enable WMAC AHB arbitration */
 146                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 147                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 148                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 149
 150                 /* Enable global WMAC swapping */
 151                 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
 152                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 153                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 154         } else {
 155                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 156                 /* TODO: check other platforms */
 157                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 158                 if (to_platform_device(sc->dev)->id == 0)
 159                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 160                 else
 161                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 162                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 163
 164                 /*
 165                  * On a dual-band AR5312, the multiband radio is only
 166                  * used as pass-through. Disable 2 GHz support in the
 167                  * driver for it
 168                  */
 169                 if (to_platform_device(sc->dev)->id == 0 &&
 170                     (bcfg->config->flags & (BD_WLAN0|BD_WLAN1)) ==
 171                      (BD_WLAN1|BD_WLAN0))
 172                         __set_bit(ATH_STAT_2G_DISABLED, sc->status);
 173         }
 174
 175         ret = ath5k_init_softc(sc, &ath_ahb_bus_ops);
 176         if (ret != 0) {
 177                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 178                 ret = -ENODEV;
 179                 goto err_free_hw;
 180         }
 181
 182         platform_set_drvdata(pdev, hw);
 183
 184         return 0;
 185
 186  err_free_hw:
 187         ieee80211_free_hw(hw);
 188         platform_set_drvdata(pdev, NULL);
 189  err_out:
 190         return ret;
 191 }
 192
 193 static int ath_ahb_remove(struct platform_device *pdev)
 194 {
 195         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 196         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 197         struct ath5k_softc *sc;
 198         u32 reg;
 199
 200         if (!hw)
 201                 return 0;
 202
 203         sc = hw->priv;
 204
 205         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 206                 /* Disable WMAC AHB arbitration */
 207                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 208                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 209                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 210         } else {
 211                 /*Stop DMA access */
 212                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 213                 if (to_platform_device(sc->dev)->id == 0)
 214                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 215                 else
 216                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 217                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 218         }
 219
 220         ath5k_deinit_softc(sc);
 221         platform_set_drvdata(pdev, NULL);
 222
 223         return 0;
 224 }
 225
 226 static struct platform_driver ath_ahb_driver = {
 227         .probe      = ath_ahb_probe,
 228         .remove     = ath_ahb_remove,
 229         .driver         = {
 230                 .name   = "ar231x-wmac",
 231                 .owner  = THIS_MODULE,
 232         },
 233 };
 234
 235 static int __init
 236 ath5k_ahb_init(void)
 237 {
 238         return platform_driver_register(&ath_ahb_driver);
 239 }
 240
 241 static void __exit
 242 ath5k_ahb_exit(void)
 243 {
 244         platform_driver_unregister(&ath_ahb_driver);
 245 }
 246
 247 module_init(ath5k_ahb_init);
 248 module_exit(ath5k_ahb_exit);