drivers/net/wireless/ath/ath5k/ahb.c

   1 /*
   2  * Copyright (c) 2008-2009 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 <ar231x_platform.h>
  22 #include "ath5k.h"
  23 #include "debug.h"
  24 #include "base.h"
  25 #include "reg.h"
  26 #include "debug.h"
  27
  28 /* return bus cachesize in 4B word units */
  29 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
  30 {
  31         *csz = L1_CACHE_BYTES >> 2;
  32 }
  33
  34 bool ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  35 {
  36         struct ath5k_softc *sc = common->priv;
  37         struct platform_device *pdev = to_platform_device(sc->dev);
  38         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  39         u16 *eeprom, *eeprom_end;
  40
  41
  42
  43         bcfg = pdev->dev.platform_data;
  44         eeprom = (u16 *) bcfg->radio;
  45         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
  46
  47         eeprom += off;
  48         if (eeprom > eeprom_end)
  49                 return -EINVAL;
  50
  51         *data = *eeprom;
  52         return 0;
  53 }
  54
  55 int ath5k_hw_read_srev(struct ath5k_hw *ah)
  56 {
  57         struct ath5k_softc *sc = ah->ah_sc;
  58         struct platform_device *pdev = to_platform_device(sc->dev);
  59         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  60         ah->ah_mac_srev = bcfg->devid;
  61         return 0;
  62 }
  63
  64 static const struct ath_bus_ops ath_ahb_bus_ops = {
  65         .ath_bus_type = ATH_AHB,
  66         .read_cachesize = ath5k_ahb_read_cachesize,
  67         .eeprom_read = ath5k_ahb_eeprom_read,
  68 };
  69
  70 /*Initialization*/
  71 static int ath_ahb_probe(struct platform_device *pdev)
  72 {
  73         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  74         struct ath5k_softc *sc;
  75         struct ieee80211_hw *hw;
  76         struct resource *res;
  77         void __iomem *mem;
  78         int irq;
  79         int ret = 0;
  80         u32 reg;
  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, res->end - res->start + 1);
  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_out;
 107         }
 108
 109         irq = res->start;
 110
 111         hw = ieee80211_alloc_hw(sizeof(struct ath5k_softc), &ath5k_hw_ops);
 112         if (hw == NULL) {
 113                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 114                 ret = -ENOMEM;
 115                 goto err_out;
 116         }
 117
 118         sc = hw->priv;
 119         sc->hw = hw;
 120         sc->dev = &pdev->dev;
 121         sc->iobase = mem;
 122         sc->irq = irq;
 123         sc->devid = bcfg->devid;
 124
 125         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 126                 /* Enable WMAC AHB arbitration */
 127                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 128                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 129                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 130
 131                 /* Enable global WMAC swapping */
 132                 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
 133                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 134                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 135         } else {
 136                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 137                 /* TODO: check other platforms */
 138                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 139                 if (to_platform_device(sc->dev)->id == 0)
 140                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 141                 else
 142                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 143                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 144         }
 145
 146         ret = ath5k_init_softc(sc, &ath_ahb_bus_ops);
 147         if (ret != 0) {
 148                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 149                 ret = -ENODEV;
 150                 goto err_free_hw;
 151         }
 152
 153         platform_set_drvdata(pdev, hw);
 154
 155         return 0;
 156
 157  err_free_hw:
 158         ieee80211_free_hw(hw);
 159         platform_set_drvdata(pdev, NULL);
 160  err_out:
 161         return ret;
 162 }
 163
 164 static int ath_ahb_remove(struct platform_device *pdev)
 165 {
 166         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 167         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 168         struct ath5k_softc *sc;
 169         u32 reg;
 170
 171         if (!hw)
 172                 return 0;
 173
 174         sc = hw->priv;
 175
 176         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 177                 /* Disable WMAC AHB arbitration */
 178                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 179                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 180                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 181         } else {
 182                 /*Stop DMA access */
 183                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 184                 if (to_platform_device(sc->dev)->id == 0)
 185                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 186                 else
 187                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 188                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 189         }
 190
 191         ath5k_deinit_softc(sc);
 192         platform_set_drvdata(pdev, NULL);
 193
 194         return 0;
 195 }
 196
 197 static struct platform_driver ath_ahb_driver = {
 198         .probe      = ath_ahb_probe,
 199         .remove     = ath_ahb_remove,
 200         .driver         = {
 201                 .name   = "ar231x-wmac",
 202                 .owner  = THIS_MODULE,
 203         },
 204 };
 205
 206 static int __init
 207 ath5k_ahb_init(void)
 208 {
 209         return platform_driver_register(&ath_ahb_driver);
 210 }
 211
 212 static void __exit
 213 ath5k_ahb_exit(void)
 214 {
 215         platform_driver_unregister(&ath_ahb_driver);
 216 }
 217
 218 module_init(ath5k_ahb_init);
 219 module_exit(ath5k_ahb_exit);