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 <linux/etherdevice.h>
  22 #include <linux/export.h>
  23 #include <ar231x_platform.h>
  24 #include "ath5k.h"
  25 #include "debug.h"
  26 #include "base.h"
  27 #include "reg.h"
  28
  29 /* return bus cachesize in 4B word units */
  30 static void ath5k_ahb_read_cachesize(struct ath_common *common, int *csz)
  31 {
  32         *csz = L1_CACHE_BYTES >> 2;
  33 }
  34
  35 static bool
  36 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  37 {
  38         struct ath5k_hw *ah = common->priv;
  39         struct platform_device *pdev = to_platform_device(ah->dev);
  40         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  41         u16 *eeprom, *eeprom_end;
  42
  43
  44
  45         bcfg = pdev->dev.platform_data;
  46         eeprom = (u16 *) bcfg->radio;
  47         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
  48
  49         eeprom += off;
  50         if (eeprom > eeprom_end)
  51                 return false;
  52
  53         *data = *eeprom;
  54         return true;
  55 }
  56
  57 int ath5k_hw_read_srev(struct ath5k_hw *ah)
  58 {
  59         struct platform_device *pdev = to_platform_device(ah->dev);
  60         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  61         ah->ah_mac_srev = bcfg->devid;
  62         return 0;
  63 }
  64
  65 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
  66 {
  67         struct platform_device *pdev = to_platform_device(ah->dev);
  68         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  69         u8 *cfg_mac;
  70
  71         if (to_platform_device(ah->dev)->id == 0)
  72                 cfg_mac = bcfg->config->wlan0_mac;
  73         else
  74                 cfg_mac = bcfg->config->wlan1_mac;
  75
  76         memcpy(mac, cfg_mac, ETH_ALEN);
  77         return 0;
  78 }
  79
  80 static const struct ath_bus_ops ath_ahb_bus_ops = {
  81         .ath_bus_type = ATH_AHB,
  82         .read_cachesize = ath5k_ahb_read_cachesize,
  83         .eeprom_read = ath5k_ahb_eeprom_read,
  84         .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
  85 };
  86
  87 /*Initialization*/
  88 static int ath_ahb_probe(struct platform_device *pdev)
  89 {
  90         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  91         struct ath5k_hw *ah;
  92         struct ieee80211_hw *hw;
  93         struct resource *res;
  94         void __iomem *mem;
  95         int irq;
  96         int ret = 0;
  97         u32 reg;
  98
  99         if (!pdev->dev.platform_data) {
 100                 dev_err(&pdev->dev, "no platform data specified\n");
 101                 ret = -EINVAL;
 102                 goto err_out;
 103         }
 104
 105         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         if (res == NULL) {
 107                 dev_err(&pdev->dev, "no memory resource found\n");
 108                 ret = -ENXIO;
 109                 goto err_out;
 110         }
 111
 112         mem = ioremap_nocache(res->start, resource_size(res));
 113         if (mem == NULL) {
 114                 dev_err(&pdev->dev, "ioremap failed\n");
 115                 ret = -ENOMEM;
 116                 goto err_out;
 117         }
 118
 119         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 120         if (res == NULL) {
 121                 dev_err(&pdev->dev, "no IRQ resource found\n");
 122                 ret = -ENXIO;
 123                 goto err_iounmap;
 124         }
 125
 126         irq = res->start;
 127
 128         hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
 129         if (hw == NULL) {
 130                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 131                 ret = -ENOMEM;
 132                 goto err_iounmap;
 133         }
 134
 135         ah = hw->priv;
 136         ah->hw = hw;
 137         ah->dev = &pdev->dev;
 138         ah->iobase = mem;
 139         ah->irq = irq;
 140         ah->devid = bcfg->devid;
 141
 142         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 143                 /* Enable WMAC AHB arbitration */
 144                 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 145                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 146                 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 147
 148                 /* Enable global WMAC swapping */
 149                 reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
 150                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 151                 iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 152         } else {
 153                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 154                 /* TODO: check other platforms */
 155                 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 156                 if (to_platform_device(ah->dev)->id == 0)
 157                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 158                 else
 159                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 160                 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 161
 162                 /*
 163                  * On a dual-band AR5312, the multiband radio is only
 164                  * used as pass-through. Disable 2 GHz support in the
 165                  * driver for it
 166                  */
 167                 if (to_platform_device(ah->dev)->id == 0 &&
 168                     (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
 169                      (BD_WLAN1 | BD_WLAN0))
 170                         ah->ah_capabilities.cap_needs_2GHz_ovr = true;
 171                 else
 172                         ah->ah_capabilities.cap_needs_2GHz_ovr = false;
 173         }
 174
 175         ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
 176         if (ret != 0) {
 177                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 178                 ret = -ENODEV;
 179                 goto err_free_hw;
 180         }
 181
 182         platform_set_drvdata(pdev, hw);
 183
 184         return 0;
 185
 186  err_free_hw:
 187         ieee80211_free_hw(hw);
 188         platform_set_drvdata(pdev, NULL);
 189  err_iounmap:
 190         iounmap(mem);
 191  err_out:
 192         return ret;
 193 }
 194
 195 static int ath_ahb_remove(struct platform_device *pdev)
 196 {
 197         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 198         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 199         struct ath5k_hw *ah;
 200         u32 reg;
 201
 202         if (!hw)
 203                 return 0;
 204
 205         ah = hw->priv;
 206
 207         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 208                 /* Disable WMAC AHB arbitration */
 209                 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 210                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 211                 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 212         } else {
 213                 /*Stop DMA access */
 214                 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 215                 if (to_platform_device(ah->dev)->id == 0)
 216                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 217                 else
 218                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 219                 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 220         }
 221
 222         ath5k_deinit_ah(ah);
 223         iounmap(ah->iobase);
 224         platform_set_drvdata(pdev, NULL);
 225         ieee80211_free_hw(hw);
 226
 227         return 0;
 228 }
 229
 230 static struct platform_driver ath_ahb_driver = {
 231         .probe      = ath_ahb_probe,
 232         .remove     = ath_ahb_remove,
 233         .driver         = {
 234                 .name   = "ar231x-wmac",
 235                 .owner  = THIS_MODULE,
 236         },
 237 };
 238
 239 module_platform_driver(ath_ahb_driver);