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 static const struct platform_device_id ath9k_platform_id_table[] = {
  25         {
  26                 .name = "ath9k",
  27                 .driver_data = AR5416_AR9100_DEVID,
  28         },
  29         {
  30                 .name = "ar934x_wmac",
  31                 .driver_data = AR9300_DEVID_AR9340,
  32         },
  33         {},
  34 };
  35
  36 /* return bus cachesize in 4B word units */
  37 static void ath_ahb_read_cachesize(struct ath_common *common, int *csz)
  38 {
  39         *csz = L1_CACHE_BYTES >> 2;
  40 }
  41
  42 static bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  43 {
  44         struct ath_softc *sc = (struct ath_softc *)common->priv;
  45         struct platform_device *pdev = to_platform_device(sc->dev);
  46         struct ath9k_platform_data *pdata;
  47
  48         pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
  49         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  50                 ath_err(common,
  51                         "%s: flash read failed, offset %08x is out of range\n",
  52                         __func__, off);
  53                 return false;
  54         }
  55
  56         *data = pdata->eeprom_data[off];
  57         return true;
  58 }
  59
  60 static struct ath_bus_ops ath_ahb_bus_ops  = {
  61         .ath_bus_type = ATH_AHB,
  62         .read_cachesize = ath_ahb_read_cachesize,
  63         .eeprom_read = ath_ahb_eeprom_read,
  64 };
  65
  66 static int ath_ahb_probe(struct platform_device *pdev)
  67 {
  68         void __iomem *mem;
  69         struct ath_softc *sc;
  70         struct ieee80211_hw *hw;
  71         struct resource *res;
  72         const struct platform_device_id *id = platform_get_device_id(pdev);
  73         int irq;
  74         int ret = 0;
  75         struct ath_hw *ah;
  76         char hw_name[64];
  77
  78         if (!pdev->dev.platform_data) {
  79                 dev_err(&pdev->dev, "no platform data specified\n");
  80                 ret = -EINVAL;
  81                 goto err_out;
  82         }
  83
  84         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  85         if (res == NULL) {
  86                 dev_err(&pdev->dev, "no memory resource found\n");
  87                 ret = -ENXIO;
  88                 goto err_out;
  89         }
  90
  91         mem = ioremap_nocache(res->start, resource_size(res));
  92         if (mem == NULL) {
  93                 dev_err(&pdev->dev, "ioremap failed\n");
  94                 ret = -ENOMEM;
  95                 goto err_out;
  96         }
  97
  98         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  99         if (res == NULL) {
 100                 dev_err(&pdev->dev, "no IRQ resource found\n");
 101                 ret = -ENXIO;
 102                 goto err_iounmap;
 103         }
 104
 105         irq = res->start;
 106
 107         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 108         if (hw == NULL) {
 109                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 110                 ret = -ENOMEM;
 111                 goto err_iounmap;
 112         }
 113
 114         SET_IEEE80211_DEV(hw, &pdev->dev);
 115         platform_set_drvdata(pdev, hw);
 116
 117         sc = hw->priv;
 118         sc->hw = hw;
 119         sc->dev = &pdev->dev;
 120         sc->mem = mem;
 121         sc->irq = irq;
 122
 123         /* Will be cleared in ath9k_start() */
 124         sc->sc_flags |= SC_OP_INVALID;
 125
 126         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 127         if (ret) {
 128                 dev_err(&pdev->dev, "request_irq failed\n");
 129                 goto err_free_hw;
 130         }
 131
 132         ret = ath9k_init_device(id->driver_data, sc, 0x0, &ath_ahb_bus_ops);
 133         if (ret) {
 134                 dev_err(&pdev->dev, "failed to initialize device\n");
 135                 goto err_irq;
 136         }
 137
 138         ah = sc->sc_ah;
 139         ath9k_hw_name(ah, hw_name, sizeof(hw_name));
 140         wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
 141                    hw_name, (unsigned long)mem, irq);
 142
 143         return 0;
 144
 145  err_irq:
 146         free_irq(irq, sc);
 147  err_free_hw:
 148         ieee80211_free_hw(hw);
 149         platform_set_drvdata(pdev, NULL);
 150  err_iounmap:
 151         iounmap(mem);
 152  err_out:
 153         return ret;
 154 }
 155
 156 static int ath_ahb_remove(struct platform_device *pdev)
 157 {
 158         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 159
 160         if (hw) {
 161                 struct ath_softc *sc = hw->priv;
 162                 void __iomem *mem = sc->mem;
 163
 164                 ath9k_deinit_device(sc);
 165                 free_irq(sc->irq, sc);
 166                 ieee80211_free_hw(sc->hw);
 167                 iounmap(mem);
 168                 platform_set_drvdata(pdev, NULL);
 169         }
 170
 171         return 0;
 172 }
 173
 174 static struct platform_driver ath_ahb_driver = {
 175         .probe      = ath_ahb_probe,
 176         .remove     = ath_ahb_remove,
 177         .driver         = {
 178                 .name   = "ath9k",
 179                 .owner  = THIS_MODULE,
 180         },
 181         .id_table    = ath9k_platform_id_table,
 182 };
 183
 184 MODULE_DEVICE_TABLE(platform, ath9k_platform_id_table);
 185
 186 int ath_ahb_init(void)
 187 {
 188         return platform_driver_register(&ath_ahb_driver);
 189 }
 190
 191 void ath_ahb_exit(void)
 192 {
 193         platform_driver_unregister(&ath_ahb_driver);
 194 }