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 <ar231x_platform.h>
  23 #include "ath5k.h"
  24 #include "debug.h"
  25 #include "base.h"
  26 #include "reg.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 static bool
  35 ath5k_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
  36 {
  37         struct ath5k_hw *ah = common->priv;
  38         struct platform_device *pdev = to_platform_device(ah->dev);
  39         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  40         u16 *eeprom, *eeprom_end;
  41
  42
  43
  44         bcfg = pdev->dev.platform_data;
  45         eeprom = (u16 *) bcfg->radio;
  46         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
  47
  48         eeprom += off;
  49         if (eeprom > eeprom_end)
  50                 return false;
  51
  52         *data = *eeprom;
  53         return true;
  54 }
  55
  56 int ath5k_hw_read_srev(struct ath5k_hw *ah)
  57 {
  58         struct platform_device *pdev = to_platform_device(ah->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 int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
  65 {
  66         struct platform_device *pdev = to_platform_device(ah->dev);
  67         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  68         u8 *cfg_mac;
  69
  70         if (to_platform_device(ah->dev)->id == 0)
  71                 cfg_mac = bcfg->config->wlan0_mac;
  72         else
  73                 cfg_mac = bcfg->config->wlan1_mac;
  74
  75         memcpy(mac, cfg_mac, ETH_ALEN);
  76         return 0;
  77 }
  78
  79 static const struct ath_bus_ops ath_ahb_bus_ops = {
  80         .ath_bus_type = ATH_AHB,
  81         .read_cachesize = ath5k_ahb_read_cachesize,
  82         .eeprom_read = ath5k_ahb_eeprom_read,
  83         .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
  84 };
  85
  86 /*Initialization*/
  87 static int ath_ahb_probe(struct platform_device *pdev)
  88 {
  89         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
  90         struct ath5k_hw *ah;
  91         struct ieee80211_hw *hw;
  92         struct resource *res;
  93         void __iomem *mem;
  94         int irq;
  95         int ret = 0;
  96         u32 reg;
  97
  98         if (!pdev->dev.platform_data) {
  99                 dev_err(&pdev->dev, "no platform data specified\n");
 100                 ret = -EINVAL;
 101                 goto err_out;
 102         }
 103
 104         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 105         if (res == NULL) {
 106                 dev_err(&pdev->dev, "no memory resource found\n");
 107                 ret = -ENXIO;
 108                 goto err_out;
 109         }
 110
 111         mem = ioremap_nocache(res->start, resource_size(res));
 112         if (mem == NULL) {
 113                 dev_err(&pdev->dev, "ioremap failed\n");
 114                 ret = -ENOMEM;
 115                 goto err_out;
 116         }
 117
 118         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 119         if (res == NULL) {
 120                 dev_err(&pdev->dev, "no IRQ resource found\n");
 121                 ret = -ENXIO;
 122                 goto err_out;
 123         }
 124
 125         irq = res->start;
 126
 127         hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
 128         if (hw == NULL) {
 129                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 130                 ret = -ENOMEM;
 131                 goto err_out;
 132         }
 133
 134         ah = hw->priv;
 135         ah->hw = hw;
 136         ah->dev = &pdev->dev;
 137         ah->iobase = mem;
 138         ah->irq = irq;
 139         ah->devid = bcfg->devid;
 140
 141         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 142                 /* Enable WMAC AHB arbitration */
 143                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 144                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 145                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 146
 147                 /* Enable global WMAC swapping */
 148                 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
 149                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 150                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 151         } else {
 152                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 153                 /* TODO: check other platforms */
 154                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 155                 if (to_platform_device(ah->dev)->id == 0)
 156                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 157                 else
 158                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 159                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 160
 161                 /*
 162                  * On a dual-band AR5312, the multiband radio is only
 163                  * used as pass-through. Disable 2 GHz support in the
 164                  * driver for it
 165                  */
 166                 if (to_platform_device(ah->dev)->id == 0 &&
 167                     (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
 168                      (BD_WLAN1 | BD_WLAN0))
 169                         ah->ah_capabilities.cap_needs_2GHz_ovr = true;
 170                 else
 171                         ah->ah_capabilities.cap_needs_2GHz_ovr = false;
 172         }
 173
 174         ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
 175         if (ret != 0) {
 176                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 177                 ret = -ENODEV;
 178                 goto err_free_hw;
 179         }
 180
 181         platform_set_drvdata(pdev, hw);
 182
 183         return 0;
 184
 185  err_free_hw:
 186         ieee80211_free_hw(hw);
 187         platform_set_drvdata(pdev, NULL);
 188  err_out:
 189         return ret;
 190 }
 191
 192 static int ath_ahb_remove(struct platform_device *pdev)
 193 {
 194         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
 195         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 196         struct ath5k_hw *ah;
 197         u32 reg;
 198
 199         if (!hw)
 200                 return 0;
 201
 202         ah = hw->priv;
 203
 204         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 205                 /* Disable WMAC AHB arbitration */
 206                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 207                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 208                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 209         } else {
 210                 /*Stop DMA access */
 211                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
 212                 if (to_platform_device(ah->dev)->id == 0)
 213                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 214                 else
 215                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 216                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 217         }
 218
 219         ath5k_deinit_ah(ah);
 220         platform_set_drvdata(pdev, NULL);
 221         ieee80211_free_hw(hw);
 222
 223         return 0;
 224 }
 225
 226 static struct platform_driver ath_ahb_driver = {
 227         .probe      = ath_ahb_probe,
 228         .remove     = ath_ahb_remove,
 229         .driver         = {
 230                 .name   = "ar231x-wmac",
 231                 .owner  = THIS_MODULE,
 232         },
 233 };
 234
 235 static int __init
 236 ath5k_ahb_init(void)
 237 {
 238         return platform_driver_register(&ath_ahb_driver);
 239 }
 240
 241 static void __exit
 242 ath5k_ahb_exit(void)
 243 {
 244         platform_driver_unregister(&ath_ahb_driver);
 245 }
 246
 247 module_init(ath5k_ahb_init);
 248 module_exit(ath5k_ahb_exit);