drivers/net/wireless/ath9k/ahb.c

   1 /*
   2  * Copyright (c) 2008 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 "core.h"
  23 #include "reg.h"
  24 #include "hw.h"
  25
  26 /* return bus cachesize in 4B word units */
  27 static void ath_ahb_read_cachesize(struct ath_softc *sc, int *csz)
  28 {
  29         *csz = L1_CACHE_BYTES >> 2;
  30 }
  31
  32 static void ath_ahb_cleanup(struct ath_softc *sc)
  33 {
  34         iounmap(sc->mem);
  35 }
  36
  37 static bool ath_ahb_eeprom_read(struct ath_hal *ah, u32 off, u16 *data)
  38 {
  39         struct ath_softc *sc = ah->ah_sc;
  40         struct platform_device *pdev = to_platform_device(sc->dev);
  41         struct ath9k_platform_data *pdata;
  42
  43         pdata = (struct ath9k_platform_data *) pdev->dev.platform_data;
  44         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
  45                 DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
  46                         "%s: flash read failed, offset %08x is out of range\n",
  47                                 __func__, off);
  48                 return false;
  49         }
  50
  51         *data = pdata->eeprom_data[off];
  52         return true;
  53 }
  54
  55 static struct ath_bus_ops ath_ahb_bus_ops  = {
  56         .read_cachesize = ath_ahb_read_cachesize,
  57         .cleanup = ath_ahb_cleanup,
  58
  59         .eeprom_read = ath_ahb_eeprom_read,
  60 };
  61
  62 static int ath_ahb_probe(struct platform_device *pdev)
  63 {
  64         void __iomem *mem;
  65         struct ath_softc *sc;
  66         struct ieee80211_hw *hw;
  67         struct resource *res;
  68         int irq;
  69         int ret = 0;
  70         struct ath_hal *ah;
  71
  72         if (!pdev->dev.platform_data) {
  73                 dev_err(&pdev->dev, "no platform data specified\n");
  74                 ret = -EINVAL;
  75                 goto err_out;
  76         }
  77
  78         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  79         if (res == NULL) {
  80                 dev_err(&pdev->dev, "no memory resource found\n");
  81                 ret = -ENXIO;
  82                 goto err_out;
  83         }
  84
  85         mem = ioremap_nocache(res->start, res->end - res->start + 1);
  86         if (mem == NULL) {
  87                 dev_err(&pdev->dev, "ioremap failed\n");
  88                 ret = -ENOMEM;
  89                 goto err_out;
  90         }
  91
  92         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  93         if (res == NULL) {
  94                 dev_err(&pdev->dev, "no IRQ resource found\n");
  95                 ret = -ENXIO;
  96                 goto err_iounmap;
  97         }
  98
  99         irq = res->start;
 100
 101         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
 102         if (hw == NULL) {
 103                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 104                 ret = -ENOMEM;
 105                 goto err_iounmap;
 106         }
 107
 108         SET_IEEE80211_DEV(hw, &pdev->dev);
 109         platform_set_drvdata(pdev, hw);
 110
 111         sc = hw->priv;
 112         sc->hw = hw;
 113         sc->dev = &pdev->dev;
 114         sc->mem = mem;
 115         sc->bus_ops = &ath_ahb_bus_ops;
 116         sc->irq = irq;
 117
 118         ret = ath_attach(AR5416_AR9100_DEVID, sc);
 119         if (ret != 0) {
 120                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 121                 ret = -ENODEV;
 122                 goto err_free_hw;
 123         }
 124
 125         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
 126         if (ret) {
 127                 dev_err(&pdev->dev, "request_irq failed, err=%d\n", ret);
 128                 ret = -EIO;
 129                 goto err_detach;
 130         }
 131
 132         ah = sc->sc_ah;
 133         printk(KERN_INFO
 134                "%s: Atheros AR%s MAC/BB Rev:%x, "
 135                "AR%s RF Rev:%x, mem=0x%lx, irq=%d\n",
 136                wiphy_name(hw->wiphy),
 137                ath_mac_bb_name(ah->ah_macVersion),
 138                ah->ah_macRev,
 139                ath_rf_name((ah->ah_analog5GhzRev & AR_RADIO_SREV_MAJOR)),
 140                ah->ah_phyRev,
 141                (unsigned long)mem, irq);
 142
 143         return 0;
 144
 145  err_detach:
 146         ath_detach(sc);
 147  err_free_hw:
 148         ieee80211_free_hw(hw);
 149         platform_set_drvdata(pdev, NULL);
 150  err_iounmap:
 151         iounmap(mem);
 152  err_out:
 153         return ret;
 154 }
 155
 156 static int ath_ahb_remove(struct platform_device *pdev)
 157 {
 158         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 159
 160         if (hw) {
 161                 struct ath_softc *sc = hw->priv;
 162
 163                 ath_cleanup(sc);
 164                 platform_set_drvdata(pdev, NULL);
 165         }
 166
 167         return 0;
 168 }
 169
 170 static struct platform_driver ath_ahb_driver = {
 171         .probe      = ath_ahb_probe,
 172         .remove     = ath_ahb_remove,
 173         .driver         = {
 174                 .name   = "ath9k",
 175                 .owner  = THIS_MODULE,
 176         },
 177 };
 178
 179 int ath_ahb_init(void)
 180 {
 181         return platform_driver_register(&ath_ahb_driver);
 182 }
 183
 184 void ath_ahb_exit(void)
 185 {
 186         platform_driver_unregister(&ath_ahb_driver);
 187 }