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_common *common, int *csz)
  26 {
  27         *csz = L1_CACHE_BYTES >> 2;
  28 }
  29
  30 static void ath_ahb_cleanup(struct ath_common *common)
  31 {
  32         struct ath_hw *ah = (struct ath_hw *) common->ah;
  33         struct ath_softc *sc = ah->ah_sc;
  34         iounmap(sc->mem);
  35 }
  36
  37 static bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  38 {
  39         struct ath_hw *ah = (struct ath_hw *) common->ah;
  40         struct ath_softc *sc = ah->ah_sc;
  41         struct platform_device *pdev = to_platform_device(sc->dev);
  42         struct ath9k_platform_data *pdata;
  43
  44         pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
  45         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  46                 ath_print(common, ATH_DBG_FATAL,
  47                           "%s: flash read failed, offset %08x "
  48                           "is out of range\n",
  49                           __func__, off);
  50                 return false;
  51         }
  52
  53         *data = pdata->eeprom_data[off];
  54         return true;
  55 }
  56
  57 static struct ath_bus_ops ath_ahb_bus_ops  = {
  58         .read_cachesize = ath_ahb_read_cachesize,
  59         .cleanup = ath_ahb_cleanup,
  60
  61         .eeprom_read = ath_ahb_eeprom_read,
  62 };
  63
  64 static int ath_ahb_probe(struct platform_device *pdev)
  65 {
  66         void __iomem *mem;
  67         struct ath_wiphy *aphy;
  68         struct ath_softc *sc;
  69         struct ieee80211_hw *hw;
  70         struct resource *res;
  71         int irq;
  72         int ret = 0;
  73         struct ath_hw *ah;
  74
  75         if (!pdev->dev.platform_data) {
  76                 dev_err(&pdev->dev, "no platform data specified\n");
  77                 ret = -EINVAL;
  78                 goto err_out;
  79         }
  80
  81         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  82         if (res == NULL) {
  83                 dev_err(&pdev->dev, "no memory resource found\n");
  84                 ret = -ENXIO;
  85                 goto err_out;
  86         }
  87
  88         mem = ioremap_nocache(res->start, res->end - res->start + 1);
  89         if (mem == NULL) {
  90                 dev_err(&pdev->dev, "ioremap failed\n");
  91                 ret = -ENOMEM;
  92                 goto err_out;
  93         }
  94
  95         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  96         if (res == NULL) {
  97                 dev_err(&pdev->dev, "no IRQ resource found\n");
  98                 ret = -ENXIO;
  99                 goto err_iounmap;
 100         }
 101
 102         irq = res->start;
 103
 104         hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy) +
 105                                 sizeof(struct ath_softc), &ath9k_ops);
 106         if (hw == NULL) {
 107                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 108                 ret = -ENOMEM;
 109                 goto err_iounmap;
 110         }
 111
 112         SET_IEEE80211_DEV(hw, &pdev->dev);
 113         platform_set_drvdata(pdev, hw);
 114
 115         aphy = hw->priv;
 116         sc = (struct ath_softc *) (aphy + 1);
 117         aphy->sc = sc;
 118         aphy->hw = hw;
 119         sc->pri_wiphy = aphy;
 120         sc->hw = hw;
 121         sc->dev = &pdev->dev;
 122         sc->mem = mem;
 123         sc->irq = irq;
 124
 125         ret = ath_init_device(AR5416_AR9100_DEVID, sc, 0x0, &ath_ahb_bus_ops);
 126         if (ret) {
 127                 dev_err(&pdev->dev, "failed to initialize device\n");
 128                 goto err_free_hw;
 129         }
 130
 131         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 132         if (ret) {
 133                 dev_err(&pdev->dev, "request_irq failed\n");
 134                 goto err_detach;
 135         }
 136
 137         ah = sc->sc_ah;
 138         printk(KERN_INFO
 139                "%s: Atheros AR%s MAC/BB Rev:%x, "
 140                "AR%s RF Rev:%x, mem=0x%lx, irq=%d\n",
 141                wiphy_name(hw->wiphy),
 142                ath_mac_bb_name(ah->hw_version.macVersion),
 143                ah->hw_version.macRev,
 144                ath_rf_name((ah->hw_version.analog5GhzRev & AR_RADIO_SREV_MAJOR)),
 145                ah->hw_version.phyRev,
 146                (unsigned long)mem, irq);
 147
 148         return 0;
 149
 150  err_detach:
 151         ath_detach(sc);
 152  err_free_hw:
 153         ieee80211_free_hw(hw);
 154         platform_set_drvdata(pdev, NULL);
 155  err_iounmap:
 156         iounmap(mem);
 157  err_out:
 158         return ret;
 159 }
 160
 161 static int ath_ahb_remove(struct platform_device *pdev)
 162 {
 163         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 164
 165         if (hw) {
 166                 struct ath_wiphy *aphy = hw->priv;
 167                 struct ath_softc *sc = aphy->sc;
 168
 169                 ath_cleanup(sc);
 170                 platform_set_drvdata(pdev, NULL);
 171         }
 172
 173         return 0;
 174 }
 175
 176 static struct platform_driver ath_ahb_driver = {
 177         .probe      = ath_ahb_probe,
 178         .remove     = ath_ahb_remove,
 179         .driver         = {
 180                 .name   = "ath9k",
 181                 .owner  = THIS_MODULE,
 182         },
 183 };
 184
 185 int ath_ahb_init(void)
 186 {
 187         return platform_driver_register(&ath_ahb_driver);
 188 }
 189
 190 void ath_ahb_exit(void)
 191 {
 192         platform_driver_unregister(&ath_ahb_driver);
 193 }