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/module.h>
  22 #include <linux/mod_devicetable.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         ath_err(common, "%s: eeprom data has to be provided externally\n",
  62                 __func__);
  63         return false;
  64 }
  65
  66 static const struct ath_bus_ops ath_ahb_bus_ops  = {
  67         .ath_bus_type = ATH_AHB,
  68         .read_cachesize = ath_ahb_read_cachesize,
  69         .eeprom_read = ath_ahb_eeprom_read,
  70 };
  71
  72 static int ath_ahb_probe(struct platform_device *pdev)
  73 {
  74         void __iomem *mem;
  75         struct ath_softc *sc;
  76         struct ieee80211_hw *hw;
  77         struct resource *res;
  78         const struct platform_device_id *id = platform_get_device_id(pdev);
  79         int irq;
  80         int ret = 0;
  81         struct ath_hw *ah;
  82         char hw_name[64];
  83
  84         if (!dev_get_platdata(&pdev->dev)) {
  85                 dev_err(&pdev->dev, "no platform data specified\n");
  86                 return -EINVAL;
  87         }
  88
  89         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  90         if (res == NULL) {
  91                 dev_err(&pdev->dev, "no memory resource found\n");
  92                 return -ENXIO;
  93         }
  94
  95         mem = devm_ioremap_nocache(&pdev->dev, res->start, resource_size(res));
  96         if (mem == NULL) {
  97                 dev_err(&pdev->dev, "ioremap failed\n");
  98                 return -ENOMEM;
  99         }
 100
 101         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 102         if (res == NULL) {
 103                 dev_err(&pdev->dev, "no IRQ resource found\n");
 104                 return -ENXIO;
 105         }
 106
 107         irq = res->start;
 108
 109         ath9k_fill_chanctx_ops();
 110         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 111         if (hw == NULL) {
 112                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 113                 return -ENOMEM;
 114         }
 115
 116         SET_IEEE80211_DEV(hw, &pdev->dev);
 117         platform_set_drvdata(pdev, hw);
 118
 119         sc = hw->priv;
 120         sc->hw = hw;
 121         sc->dev = &pdev->dev;
 122         sc->mem = mem;
 123         sc->irq = irq;
 124
 125         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 126         if (ret) {
 127                 dev_err(&pdev->dev, "request_irq failed\n");
 128                 goto err_free_hw;
 129         }
 130
 131         ret = ath9k_init_device(id->driver_data, sc, &ath_ahb_bus_ops);
 132         if (ret) {
 133                 dev_err(&pdev->dev, "failed to initialize device\n");
 134                 goto err_irq;
 135         }
 136
 137         ah = sc->sc_ah;
 138         ath9k_hw_name(ah, hw_name, sizeof(hw_name));
 139         wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
 140                    hw_name, (unsigned long)mem, irq);
 141
 142         return 0;
 143
 144  err_irq:
 145         free_irq(irq, sc);
 146  err_free_hw:
 147         ieee80211_free_hw(hw);
 148         return ret;
 149 }
 150
 151 static int ath_ahb_remove(struct platform_device *pdev)
 152 {
 153         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 154
 155         if (hw) {
 156                 struct ath_softc *sc = hw->priv;
 157
 158                 ath9k_deinit_device(sc);
 159                 free_irq(sc->irq, sc);
 160                 ieee80211_free_hw(sc->hw);
 161         }
 162
 163         return 0;
 164 }
 165
 166 static struct platform_driver ath_ahb_driver = {
 167         .probe      = ath_ahb_probe,
 168         .remove     = ath_ahb_remove,
 169         .driver         = {
 170                 .name   = "ath9k",
 171         },
 172         .id_table    = ath9k_platform_id_table,
 173 };
 174
 175 MODULE_DEVICE_TABLE(platform, ath9k_platform_id_table);
 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 }