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