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