drivers/net/wireless/ath/ath9k/ahb.c

   1 /*
   2  * Copyright (c) 2008-2011 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 <linux/module.h>
  23 #include "ath9k.h"
  24
  25 static const struct platform_device_id ath9k_platform_id_table[] = {
  26         {
  27                 .name = "ath9k",
  28                 .driver_data = AR5416_AR9100_DEVID,
  29         },
  30         {
  31                 .name = "ar933x_wmac",
  32                 .driver_data = AR9300_DEVID_AR9330,
  33         },
  34         {
  35                 .name = "ar934x_wmac",
  36                 .driver_data = AR9300_DEVID_AR9340,
  37         },
  38         {
  39                 .name = "qca955x_wmac",
  40                 .driver_data = AR9300_DEVID_QCA955X,
  41         },
  42         {},
  43 };
  44
  45 /* return bus cachesize in 4B word units */
  46 static void ath_ahb_read_cachesize(struct ath_common *common, int *csz)
  47 {
  48         *csz = L1_CACHE_BYTES >> 2;
  49 }
  50
  51 static bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  52 {
  53         struct ath_softc *sc = (struct ath_softc *)common->priv;
  54         struct platform_device *pdev = to_platform_device(sc->dev);
  55         struct ath9k_platform_data *pdata;
  56
  57         pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
  58         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  59                 ath_err(common,
  60                         "%s: flash read failed, offset %08x is out of range\n",
  61                         __func__, off);
  62                 return false;
  63         }
  64
  65         *data = pdata->eeprom_data[off];
  66         return true;
  67 }
  68
  69 static struct ath_bus_ops ath_ahb_bus_ops  = {
  70         .ath_bus_type = ATH_AHB,
  71         .read_cachesize = ath_ahb_read_cachesize,
  72         .eeprom_read = ath_ahb_eeprom_read,
  73 };
  74
  75 static int ath_ahb_probe(struct platform_device *pdev)
  76 {
  77         void __iomem *mem;
  78         struct ath_softc *sc;
  79         struct ieee80211_hw *hw;
  80         struct resource *res;
  81         const struct platform_device_id *id = platform_get_device_id(pdev);
  82         int irq;
  83         int ret = 0;
  84         struct ath_hw *ah;
  85         char hw_name[64];
  86
  87         if (!pdev->dev.platform_data) {
  88                 dev_err(&pdev->dev, "no platform data specified\n");
  89                 ret = -EINVAL;
  90                 goto err_out;
  91         }
  92
  93         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  94         if (res == NULL) {
  95                 dev_err(&pdev->dev, "no memory resource found\n");
  96                 ret = -ENXIO;
  97                 goto err_out;
  98         }
  99
 100         mem = ioremap_nocache(res->start, resource_size(res));
 101         if (mem == NULL) {
 102                 dev_err(&pdev->dev, "ioremap failed\n");
 103                 ret = -ENOMEM;
 104                 goto err_out;
 105         }
 106
 107         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 108         if (res == NULL) {
 109                 dev_err(&pdev->dev, "no IRQ resource found\n");
 110                 ret = -ENXIO;
 111                 goto err_iounmap;
 112         }
 113
 114         irq = res->start;
 115
 116         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 117         if (hw == NULL) {
 118                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 119                 ret = -ENOMEM;
 120                 goto err_iounmap;
 121         }
 122
 123         SET_IEEE80211_DEV(hw, &pdev->dev);
 124         platform_set_drvdata(pdev, hw);
 125
 126         sc = hw->priv;
 127         sc->hw = hw;
 128         sc->dev = &pdev->dev;
 129         sc->mem = mem;
 130         sc->irq = irq;
 131
 132         /* Will be cleared in ath9k_start() */
 133         set_bit(SC_OP_INVALID, &sc->sc_flags);
 134
 135         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 136         if (ret) {
 137                 dev_err(&pdev->dev, "request_irq failed\n");
 138                 goto err_free_hw;
 139         }
 140
 141         ret = ath9k_init_device(id->driver_data, sc, &ath_ahb_bus_ops);
 142         if (ret) {
 143                 dev_err(&pdev->dev, "failed to initialize device\n");
 144                 goto err_irq;
 145         }
 146
 147         ah = sc->sc_ah;
 148         ath9k_hw_name(ah, hw_name, sizeof(hw_name));
 149         wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
 150                    hw_name, (unsigned long)mem, irq);
 151
 152         return 0;
 153
 154  err_irq:
 155         free_irq(irq, sc);
 156  err_free_hw:
 157         ieee80211_free_hw(hw);
 158         platform_set_drvdata(pdev, NULL);
 159  err_iounmap:
 160         iounmap(mem);
 161  err_out:
 162         return ret;
 163 }
 164
 165 static int ath_ahb_remove(struct platform_device *pdev)
 166 {
 167         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 168
 169         if (hw) {
 170                 struct ath_softc *sc = hw->priv;
 171                 void __iomem *mem = sc->mem;
 172
 173                 ath9k_deinit_device(sc);
 174                 free_irq(sc->irq, sc);
 175                 ieee80211_free_hw(sc->hw);
 176                 iounmap(mem);
 177                 platform_set_drvdata(pdev, NULL);
 178         }
 179
 180         return 0;
 181 }
 182
 183 static struct platform_driver ath_ahb_driver = {
 184         .probe      = ath_ahb_probe,
 185         .remove     = ath_ahb_remove,
 186         .driver         = {
 187                 .name   = "ath9k",
 188                 .owner  = THIS_MODULE,
 189         },
 190         .id_table    = ath9k_platform_id_table,
 191 };
 192
 193 MODULE_DEVICE_TABLE(platform, ath9k_platform_id_table);
 194
 195 int ath_ahb_init(void)
 196 {
 197         return platform_driver_register(&ath_ahb_driver);
 198 }
 199
 200 void ath_ahb_exit(void)
 201 {
 202         platform_driver_unregister(&ath_ahb_driver);
 203 }