drivers/net/wireless/ath9k/ahb.c

   1 /*
   2  * Copyright (c) 2008 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_softc *sc;
  64         struct ieee80211_hw *hw;
  65         struct resource *res;
  66         int irq;
  67         int ret = 0;
  68         struct ath_hw *ah;
  69
  70         if (!pdev->dev.platform_data) {
  71                 dev_err(&pdev->dev, "no platform data specified\n");
  72                 ret = -EINVAL;
  73                 goto err_out;
  74         }
  75
  76         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  77         if (res == NULL) {
  78                 dev_err(&pdev->dev, "no memory resource found\n");
  79                 ret = -ENXIO;
  80                 goto err_out;
  81         }
  82
  83         mem = ioremap_nocache(res->start, res->end - res->start + 1);
  84         if (mem == NULL) {
  85                 dev_err(&pdev->dev, "ioremap failed\n");
  86                 ret = -ENOMEM;
  87                 goto err_out;
  88         }
  89
  90         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  91         if (res == NULL) {
  92                 dev_err(&pdev->dev, "no IRQ resource found\n");
  93                 ret = -ENXIO;
  94                 goto err_iounmap;
  95         }
  96
  97         irq = res->start;
  98
  99         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 100         if (hw == NULL) {
 101                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 102                 ret = -ENOMEM;
 103                 goto err_iounmap;
 104         }
 105
 106         SET_IEEE80211_DEV(hw, &pdev->dev);
 107         platform_set_drvdata(pdev, hw);
 108
 109         sc = hw->priv;
 110         sc->hw = hw;
 111         sc->dev = &pdev->dev;
 112         sc->mem = mem;
 113         sc->bus_ops = &ath_ahb_bus_ops;
 114         sc->irq = irq;
 115
 116         ret = ath_attach(AR5416_AR9100_DEVID, sc);
 117         if (ret != 0) {
 118                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 119                 ret = -ENODEV;
 120                 goto err_free_hw;
 121         }
 122
 123         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 124         if (ret) {
 125                 dev_err(&pdev->dev, "request_irq failed, err=%d\n", ret);
 126                 ret = -EIO;
 127                 goto err_detach;
 128         }
 129
 130         ah = sc->sc_ah;
 131         printk(KERN_INFO
 132                "%s: Atheros AR%s MAC/BB Rev:%x, "
 133                "AR%s RF Rev:%x, mem=0x%lx, irq=%d\n",
 134                wiphy_name(hw->wiphy),
 135                ath_mac_bb_name(ah->hw_version.macVersion),
 136                ah->hw_version.macRev,
 137                ath_rf_name((ah->hw_version.analog5GhzRev & AR_RADIO_SREV_MAJOR)),
 138                ah->hw_version.phyRev,
 139                (unsigned long)mem, irq);
 140
 141         return 0;
 142
 143  err_detach:
 144         ath_detach(sc);
 145  err_free_hw:
 146         ieee80211_free_hw(hw);
 147         platform_set_drvdata(pdev, NULL);
 148  err_iounmap:
 149         iounmap(mem);
 150  err_out:
 151         return ret;
 152 }
 153
 154 static int ath_ahb_remove(struct platform_device *pdev)
 155 {
 156         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 157
 158         if (hw) {
 159                 struct ath_softc *sc = hw->priv;
 160
 161                 ath_cleanup(sc);
 162                 platform_set_drvdata(pdev, NULL);
 163         }
 164
 165         return 0;
 166 }
 167
 168 static struct platform_driver ath_ahb_driver = {
 169         .probe      = ath_ahb_probe,
 170         .remove     = ath_ahb_remove,
 171         .driver         = {
 172                 .name   = "ath9k",
 173                 .owner  = THIS_MODULE,
 174         },
 175 };
 176
 177 int ath_ahb_init(void)
 178 {
 179         return platform_driver_register(&ath_ahb_driver);
 180 }
 181
 182 void ath_ahb_exit(void)
 183 {
 184         platform_driver_unregister(&ath_ahb_driver);
 185 }