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/module.h>
  20 #include <linux/nl80211.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/etherdevice.h>
  23 #include <ath25_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 = dev_get_platdata(&pdev->dev);
  41         u16 *eeprom, *eeprom_end;
  42
  43         eeprom = (u16 *) bcfg->radio;
  44         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
  45
  46         eeprom += off;
  47         if (eeprom > eeprom_end)
  48                 return false;
  49
  50         *data = *eeprom;
  51         return true;
  52 }
  53
  54 int ath5k_hw_read_srev(struct ath5k_hw *ah)
  55 {
  56         struct platform_device *pdev = to_platform_device(ah->dev);
  57         struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
  58         ah->ah_mac_srev = bcfg->devid;
  59         return 0;
  60 }
  61
  62 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
  63 {
  64         struct platform_device *pdev = to_platform_device(ah->dev);
  65         struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
  66         u8 *cfg_mac;
  67
  68         if (to_platform_device(ah->dev)->id == 0)
  69                 cfg_mac = bcfg->config->wlan0_mac;
  70         else
  71                 cfg_mac = bcfg->config->wlan1_mac;
  72
  73         memcpy(mac, cfg_mac, ETH_ALEN);
  74         return 0;
  75 }
  76
  77 static const struct ath_bus_ops ath_ahb_bus_ops = {
  78         .ath_bus_type = ATH_AHB,
  79         .read_cachesize = ath5k_ahb_read_cachesize,
  80         .eeprom_read = ath5k_ahb_eeprom_read,
  81         .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
  82 };
  83
  84 /*Initialization*/
  85 static int ath_ahb_probe(struct platform_device *pdev)
  86 {
  87         struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
  88         struct ath5k_hw *ah;
  89         struct ieee80211_hw *hw;
  90         struct resource *res;
  91         void __iomem *mem;
  92         int irq;
  93         int ret = 0;
  94         u32 reg;
  95
  96         if (!dev_get_platdata(&pdev->dev)) {
  97                 dev_err(&pdev->dev, "no platform data specified\n");
  98                 ret = -EINVAL;
  99                 goto err_out;
 100         }
 101
 102         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 103         if (res == NULL) {
 104                 dev_err(&pdev->dev, "no memory resource found\n");
 105                 ret = -ENXIO;
 106                 goto err_out;
 107         }
 108
 109         mem = ioremap(res->start, resource_size(res));
 110         if (mem == NULL) {
 111                 dev_err(&pdev->dev, "ioremap failed\n");
 112                 ret = -ENOMEM;
 113                 goto err_out;
 114         }
 115
 116         irq = platform_get_irq(pdev, 0);
 117         if (irq < 0) {
 118                 ret = irq;
 119                 goto err_iounmap;
 120         }
 121
 122         hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
 123         if (hw == NULL) {
 124                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 125                 ret = -ENOMEM;
 126                 goto err_iounmap;
 127         }
 128
 129         ah = hw->priv;
 130         ah->hw = hw;
 131         ah->dev = &pdev->dev;
 132         ah->iobase = mem;
 133         ah->irq = irq;
 134         ah->devid = bcfg->devid;
 135
 136         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 137                 /* Enable WMAC AHB arbitration */
 138                 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 139                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 140                 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 141
 142                 /* Enable global WMAC swapping */
 143                 reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
 144                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 145                 iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 146         } else {
 147                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 148                 /* TODO: check other platforms */
 149                 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 150                 if (to_platform_device(ah->dev)->id == 0)
 151                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 152                 else
 153                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 154                 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 155
 156                 /*
 157                  * On a dual-band AR5312, the multiband radio is only
 158                  * used as pass-through. Disable 2 GHz support in the
 159                  * driver for it
 160                  */
 161                 if (to_platform_device(ah->dev)->id == 0 &&
 162                     (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
 163                      (BD_WLAN1 | BD_WLAN0))
 164                         ah->ah_capabilities.cap_needs_2GHz_ovr = true;
 165                 else
 166                         ah->ah_capabilities.cap_needs_2GHz_ovr = false;
 167         }
 168
 169         ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
 170         if (ret != 0) {
 171                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 172                 ret = -ENODEV;
 173                 goto err_free_hw;
 174         }
 175
 176         platform_set_drvdata(pdev, hw);
 177
 178         return 0;
 179
 180  err_free_hw:
 181         ieee80211_free_hw(hw);
 182  err_iounmap:
 183         iounmap(mem);
 184  err_out:
 185         return ret;
 186 }
 187
 188 static void ath_ahb_remove(struct platform_device *pdev)
 189 {
 190         struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
 191         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 192         struct ath5k_hw *ah;
 193         u32 reg;
 194
 195         if (!hw)
 196                 return;
 197
 198         ah = hw->priv;
 199
 200         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 201                 /* Disable WMAC AHB arbitration */
 202                 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 203                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 204                 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 205         } else {
 206                 /*Stop DMA access */
 207                 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 208                 if (to_platform_device(ah->dev)->id == 0)
 209                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 210                 else
 211                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 212                 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 213         }
 214
 215         ath5k_deinit_ah(ah);
 216         iounmap(ah->iobase);
 217         ieee80211_free_hw(hw);
 218 }
 219
 220 static struct platform_driver ath_ahb_driver = {
 221         .probe      = ath_ahb_probe,
 222         .remove_new = ath_ahb_remove,
 223         .driver         = {
 224                 .name   = "ar231x-wmac",
 225         },
 226 };
 227
 228 module_platform_driver(ath_ahb_driver);