kernel/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                 .name = "qca953x_wmac",
  44                 .driver_data = AR9300_DEVID_AR953X,
  45         },
  46         {
  47                 .name = "qca956x_wmac",
  48                 .driver_data = AR9300_DEVID_QCA956X,
  49         },
  50         {},
  51 };
  52
  53 /* return bus cachesize in 4B word units */
  54 static void ath_ahb_read_cachesize(struct ath_common *common, int *csz)
  55 {
  56         *csz = L1_CACHE_BYTES >> 2;
  57 }
  58
  59 static bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  60 {
  61         struct ath_softc *sc = (struct ath_softc *)common->priv;
  62         struct platform_device *pdev = to_platform_device(sc->dev);
  63         struct ath9k_platform_data *pdata;
  64
  65         pdata = dev_get_platdata(&pdev->dev);
  66         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  67                 ath_err(common,
  68                         "%s: flash read failed, offset %08x is out of range\n",
  69                         __func__, off);
  70                 return false;
  71         }
  72
  73         *data = pdata->eeprom_data[off];
  74         return true;
  75 }
  76
  77 static struct ath_bus_ops ath_ahb_bus_ops  = {
  78         .ath_bus_type = ATH_AHB,
  79         .read_cachesize = ath_ahb_read_cachesize,
  80         .eeprom_read = ath_ahb_eeprom_read,
  81 };
  82
  83 static int ath_ahb_probe(struct platform_device *pdev)
  84 {
  85         void __iomem *mem;
  86         struct ath_softc *sc;
  87         struct ieee80211_hw *hw;
  88         struct resource *res;
  89         const struct platform_device_id *id = platform_get_device_id(pdev);
  90         int irq;
  91         int ret = 0;
  92         struct ath_hw *ah;
  93         char hw_name[64];
  94
  95         if (!dev_get_platdata(&pdev->dev)) {
  96                 dev_err(&pdev->dev, "no platform data specified\n");
  97                 return -EINVAL;
  98         }
  99
 100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 101         if (res == NULL) {
 102                 dev_err(&pdev->dev, "no memory resource found\n");
 103                 return -ENXIO;
 104         }
 105
 106         mem = devm_ioremap_nocache(&pdev->dev, res->start, resource_size(res));
 107         if (mem == NULL) {
 108                 dev_err(&pdev->dev, "ioremap failed\n");
 109                 return -ENOMEM;
 110         }
 111
 112         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 113         if (res == NULL) {
 114                 dev_err(&pdev->dev, "no IRQ resource found\n");
 115                 return -ENXIO;
 116         }
 117
 118         irq = res->start;
 119
 120         ath9k_fill_chanctx_ops();
 121         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 122         if (hw == NULL) {
 123                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 124                 return -ENOMEM;
 125         }
 126
 127         SET_IEEE80211_DEV(hw, &pdev->dev);
 128         platform_set_drvdata(pdev, hw);
 129
 130         sc = hw->priv;
 131         sc->hw = hw;
 132         sc->dev = &pdev->dev;
 133         sc->mem = mem;
 134         sc->irq = irq;
 135
 136         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 137         if (ret) {
 138                 dev_err(&pdev->dev, "request_irq failed\n");
 139                 goto err_free_hw;
 140         }
 141
 142         ret = ath9k_init_device(id->driver_data, sc, &ath_ahb_bus_ops);
 143         if (ret) {
 144                 dev_err(&pdev->dev, "failed to initialize device\n");
 145                 goto err_irq;
 146         }
 147
 148         ah = sc->sc_ah;
 149         ath9k_hw_name(ah, hw_name, sizeof(hw_name));
 150         wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
 151                    hw_name, (unsigned long)mem, irq);
 152
 153         return 0;
 154
 155  err_irq:
 156         free_irq(irq, sc);
 157  err_free_hw:
 158         ieee80211_free_hw(hw);
 159         return ret;
 160 }
 161
 162 static int ath_ahb_remove(struct platform_device *pdev)
 163 {
 164         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 165
 166         if (hw) {
 167                 struct ath_softc *sc = hw->priv;
 168
 169                 ath9k_deinit_device(sc);
 170                 free_irq(sc->irq, sc);
 171                 ieee80211_free_hw(sc->hw);
 172         }
 173
 174         return 0;
 175 }
 176
 177 static struct platform_driver ath_ahb_driver = {
 178         .probe      = ath_ahb_probe,
 179         .remove     = ath_ahb_remove,
 180         .driver         = {
 181                 .name   = "ath9k",
 182         },
 183         .id_table    = ath9k_platform_id_table,
 184 };
 185
 186 MODULE_DEVICE_TABLE(platform, ath9k_platform_id_table);
 187
 188 int ath_ahb_init(void)
 189 {
 190         return platform_driver_register(&ath_ahb_driver);
 191 }
 192
 193 void ath_ahb_exit(void)
 194 {
 195         platform_driver_unregister(&ath_ahb_driver);
 196 }