kernel/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 <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_nocache(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         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 117         if (res == NULL) {
 118                 dev_err(&pdev->dev, "no IRQ resource found\n");
 119                 ret = -ENXIO;
 120                 goto err_iounmap;
 121         }
 122
 123         irq = res->start;
 124
 125         hw = ieee80211_alloc_hw(sizeof(struct ath5k_hw), &ath5k_hw_ops);
 126         if (hw == NULL) {
 127                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
 128                 ret = -ENOMEM;
 129                 goto err_iounmap;
 130         }
 131
 132         ah = hw->priv;
 133         ah->hw = hw;
 134         ah->dev = &pdev->dev;
 135         ah->iobase = mem;
 136         ah->irq = irq;
 137         ah->devid = bcfg->devid;
 138
 139         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 140                 /* Enable WMAC AHB arbitration */
 141                 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 142                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
 143                 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 144
 145                 /* Enable global WMAC swapping */
 146                 reg = ioread32((void __iomem *) AR5K_AR2315_BYTESWAP);
 147                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
 148                 iowrite32(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
 149         } else {
 150                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
 151                 /* TODO: check other platforms */
 152                 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 153                 if (to_platform_device(ah->dev)->id == 0)
 154                         reg |= AR5K_AR5312_ENABLE_WLAN0;
 155                 else
 156                         reg |= AR5K_AR5312_ENABLE_WLAN1;
 157                 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 158
 159                 /*
 160                  * On a dual-band AR5312, the multiband radio is only
 161                  * used as pass-through. Disable 2 GHz support in the
 162                  * driver for it
 163                  */
 164                 if (to_platform_device(ah->dev)->id == 0 &&
 165                     (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
 166                      (BD_WLAN1 | BD_WLAN0))
 167                         ah->ah_capabilities.cap_needs_2GHz_ovr = true;
 168                 else
 169                         ah->ah_capabilities.cap_needs_2GHz_ovr = false;
 170         }
 171
 172         ret = ath5k_init_ah(ah, &ath_ahb_bus_ops);
 173         if (ret != 0) {
 174                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
 175                 ret = -ENODEV;
 176                 goto err_free_hw;
 177         }
 178
 179         platform_set_drvdata(pdev, hw);
 180
 181         return 0;
 182
 183  err_free_hw:
 184         ieee80211_free_hw(hw);
 185  err_iounmap:
 186         iounmap(mem);
 187  err_out:
 188         return ret;
 189 }
 190
 191 static int ath_ahb_remove(struct platform_device *pdev)
 192 {
 193         struct ar231x_board_config *bcfg = dev_get_platdata(&pdev->dev);
 194         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
 195         struct ath5k_hw *ah;
 196         u32 reg;
 197
 198         if (!hw)
 199                 return 0;
 200
 201         ah = hw->priv;
 202
 203         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
 204                 /* Disable WMAC AHB arbitration */
 205                 reg = ioread32((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 206                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
 207                 iowrite32(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
 208         } else {
 209                 /*Stop DMA access */
 210                 reg = ioread32((void __iomem *) AR5K_AR5312_ENABLE);
 211                 if (to_platform_device(ah->dev)->id == 0)
 212                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
 213                 else
 214                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
 215                 iowrite32(reg, (void __iomem *) AR5K_AR5312_ENABLE);
 216         }
 217
 218         ath5k_deinit_ah(ah);
 219         iounmap(ah->iobase);
 220         ieee80211_free_hw(hw);
 221
 222         return 0;
 223 }
 224
 225 static struct platform_driver ath_ahb_driver = {
 226         .probe      = ath_ahb_probe,
 227         .remove     = ath_ahb_remove,
 228         .driver         = {
 229                 .name   = "ar231x-wmac",
 230         },
 231 };
 232
 233 module_platform_driver(ath_ahb_driver);