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 bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  31 {
  32         struct ath_softc *sc = (struct ath_softc *)common->priv;
  33         struct platform_device *pdev = to_platform_device(sc->dev);
  34         struct ath9k_platform_data *pdata;
  35
  36         pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
  37         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  38                 ath_err(common,
  39                         "%s: flash read failed, offset %08x is out of range\n",
  40                         __func__, off);
  41                 return false;
  42         }
  43
  44         *data = pdata->eeprom_data[off];
  45         return true;
  46 }
  47
  48 static struct ath_bus_ops ath_ahb_bus_ops  = {
  49         .ath_bus_type = ATH_AHB,
  50         .read_cachesize = ath_ahb_read_cachesize,
  51         .eeprom_read = ath_ahb_eeprom_read,
  52 };
  53
  54 static int ath_ahb_probe(struct platform_device *pdev)
  55 {
  56         void __iomem *mem;
  57         struct ath_wiphy *aphy;
  58         struct ath_softc *sc;
  59         struct ieee80211_hw *hw;
  60         struct resource *res;
  61         int irq;
  62         int ret = 0;
  63         struct ath_hw *ah;
  64         char hw_name[64];
  65
  66         if (!pdev->dev.platform_data) {
  67                 dev_err(&pdev->dev, "no platform data specified\n");
  68                 ret = -EINVAL;
  69                 goto err_out;
  70         }
  71
  72         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  73         if (res == NULL) {
  74                 dev_err(&pdev->dev, "no memory resource found\n");
  75                 ret = -ENXIO;
  76                 goto err_out;
  77         }
  78
  79         mem = ioremap_nocache(res->start, res->end - res->start + 1);
  80         if (mem == NULL) {
  81                 dev_err(&pdev->dev, "ioremap failed\n");
  82                 ret = -ENOMEM;
  83                 goto err_out;
  84         }
  85
  86         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  87         if (res == NULL) {
  88                 dev_err(&pdev->dev, "no IRQ resource found\n");
  89                 ret = -ENXIO;
  90                 goto err_iounmap;
  91         }
  92
  93         irq = res->start;
  94
  95         hw = ieee80211_alloc_hw(sizeof(struct ath_wiphy) +
  96                                 sizeof(struct ath_softc), &ath9k_ops);
  97         if (hw == NULL) {
  98                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
  99                 ret = -ENOMEM;
 100                 goto err_iounmap;
 101         }
 102
 103         SET_IEEE80211_DEV(hw, &pdev->dev);
 104         platform_set_drvdata(pdev, hw);
 105
 106         aphy = hw->priv;
 107         sc = (struct ath_softc *) (aphy + 1);
 108         aphy->sc = sc;
 109         aphy->hw = hw;
 110         sc->pri_wiphy = aphy;
 111         sc->hw = hw;
 112         sc->dev = &pdev->dev;
 113         sc->mem = mem;
 114         sc->irq = irq;
 115
 116         /* Will be cleared in ath9k_start() */
 117         sc->sc_flags |= SC_OP_INVALID;
 118
 119         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 120         if (ret) {
 121                 dev_err(&pdev->dev, "request_irq failed\n");
 122                 goto err_free_hw;
 123         }
 124
 125         ret = ath9k_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_irq;
 129         }
 130
 131         ah = sc->sc_ah;
 132         ath9k_hw_name(ah, hw_name, sizeof(hw_name));
 133         wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
 134                    hw_name, (unsigned long)mem, irq);
 135
 136         return 0;
 137
 138  err_irq:
 139         free_irq(irq, sc);
 140  err_free_hw:
 141         ieee80211_free_hw(hw);
 142         platform_set_drvdata(pdev, NULL);
 143  err_iounmap:
 144         iounmap(mem);
 145  err_out:
 146         return ret;
 147 }
 148
 149 static int ath_ahb_remove(struct platform_device *pdev)
 150 {
 151         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 152
 153         if (hw) {
 154                 struct ath_wiphy *aphy = hw->priv;
 155                 struct ath_softc *sc = aphy->sc;
 156                 void __iomem *mem = sc->mem;
 157
 158                 ath9k_deinit_device(sc);
 159                 free_irq(sc->irq, sc);
 160                 ieee80211_free_hw(sc->hw);
 161                 iounmap(mem);
 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 }