Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/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 = 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                 .owner  = THIS_MODULE,
231         },
232 };
233 
234 module_platform_driver(ath_ahb_driver);
235 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us