drivers/net/wireless/ath/ath9k/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/ath9k_platform.h>
  22 #include "ath9k.h"
  23
  24 /* return bus cachesize in 4B word units */
  25 static void ath_ahb_read_cachesize(struct ath_softc *sc, int *csz)
  26 {
  27         *csz = L1_CACHE_BYTES >> 2;
  28 }
  29
  30 static void ath_ahb_cleanup(struct ath_softc *sc)
  31 {
  32         iounmap(sc->mem);
  33 }
  34
  35 static bool ath_ahb_eeprom_read(struct ath_hw *ah, u32 off, u16 *data)
  36 {
  37         struct ath_softc *sc = ah->ah_sc;
  38         struct platform_device *pdev = to_platform_device(sc->dev);
  39         struct ath9k_platform_data *pdata;
  40
  41         pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
  42         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  43                 DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
  44                         "%s: flash read failed, offset %08x is out of range\n",
  45                                 __func__, off);
  46                 return false;
  47         }
  48
  49         *data = pdata->eeprom_data[off];
  50         return true;
  51 }
  52
  53 static struct ath_bus_ops ath_ahb_bus_ops  = {
  54         .read_cachesize = ath_ahb_read_cachesize,
  55         .cleanup = ath_ahb_cleanup,
  56
  57         .eeprom_read = ath_ahb_eeprom_read,
  58 };
  59
  60 static int ath_ahb_probe(struct platform_device *pdev)
  61 {
  62         void __iomem *mem;
  63         struct ath_wiphy *aphy;
  64         struct ath_softc *sc;
  65         struct ieee80211_hw *hw;
  66         struct resource *res;
  67         int irq;
  68         int ret = 0;
  69         struct ath_hw *ah;
  70
  71         if (!pdev->dev.platform_data) {
  72                 dev_err(&pdev->dev, "no platform data specified\n");
  73                 ret = -EINVAL;
  74                 goto err_out;
  75         }
  76
  77         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  78         if (res == NULL) {
  79                 dev_err(&pdev->dev, "no memory resource found\n");
  80                 ret = -ENXIO;
  81                 goto err_out;
  82         }
  83
  84         mem = ioremap_nocache(res->start, res->end - res->start + 1);
  85         if (mem == NULL) {
  86                 dev_err(&pdev->dev, "ioremap failed\n");
  87                 ret = -ENOMEM;
  88                 goto err_out;
  89         }
  90
  91         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  92         if (res == NULL) {
  93                 dev_err(&pdev->dev, "no IRQ resource found\n");
  94                 ret = -ENXIO;
  95                 goto err_iounmap;
  96         }
  97
  98         irq = res->start;
  99
 100         hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy) +
 101                                 sizeof(struct ath_softc), &ath9k_ops);
 102         if (hw == NULL) {
 103                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 104                 ret = -ENOMEM;
 105                 goto err_iounmap;
 106         }
 107
 108         SET_IEEE80211_DEV(hw, &pdev->dev);
 109         platform_set_drvdata(pdev, hw);
 110
 111         aphy = hw->priv;
 112         sc = (struct ath_softc *) (aphy + 1);
 113         aphy->sc = sc;
 114         aphy->hw = hw;
 115         sc->pri_wiphy = aphy;
 116         sc->hw = hw;
 117         sc->dev = &pdev->dev;
 118         sc->mem = mem;
 119         sc->bus_ops = &ath_ahb_bus_ops;
 120         sc->irq = irq;
 121
 122         ret = ath_init_device(AR5416_AR9100_DEVID, sc, 0x0);
 123         if (ret) {
 124                 dev_err(&pdev->dev, "failed to initialize device\n");
 125                 goto err_free_hw;
 126         }
 127
 128         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 129         if (ret) {
 130                 dev_err(&pdev->dev, "request_irq failed\n");
 131                 goto err_detach;
 132         }
 133
 134         ah = sc->sc_ah;
 135         printk(KERN_INFO
 136                "%s: Atheros AR%s MAC/BB Rev:%x, "
 137                "AR%s RF Rev:%x, mem=0x%lx, irq=%d\n",
 138                wiphy_name(hw->wiphy),
 139                ath_mac_bb_name(ah->hw_version.macVersion),
 140                ah->hw_version.macRev,
 141                ath_rf_name((ah->hw_version.analog5GhzRev & AR_RADIO_SREV_MAJOR)),
 142                ah->hw_version.phyRev,
 143                (unsigned long)mem, irq);
 144
 145         return 0;
 146
 147  err_detach:
 148         ath_detach(sc);
 149  err_free_hw:
 150         ieee80211_free_hw(hw);
 151         platform_set_drvdata(pdev, NULL);
 152  err_iounmap:
 153         iounmap(mem);
 154  err_out:
 155         return ret;
 156 }
 157
 158 static int ath_ahb_remove(struct platform_device *pdev)
 159 {
 160         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 161
 162         if (hw) {
 163                 struct ath_wiphy *aphy = hw->priv;
 164                 struct ath_softc *sc = aphy->sc;
 165
 166                 ath_cleanup(sc);
 167                 platform_set_drvdata(pdev, NULL);
 168         }
 169
 170         return 0;
 171 }
 172
 173 static struct platform_driver ath_ahb_driver = {
 174         .probe      = ath_ahb_probe,
 175         .remove     = ath_ahb_remove,
 176         .driver         = {
 177                 .name   = "ath9k",
 178                 .owner  = THIS_MODULE,
 179         },
 180 };
 181
 182 int ath_ahb_init(void)
 183 {
 184         return platform_driver_register(&ath_ahb_driver);
 185 }
 186
 187 void ath_ahb_exit(void)
 188 {
 189         platform_driver_unregister(&ath_ahb_driver);
 190 }