Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
[linux-2.6.git] / 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                         __set_bit(ATH_STAT_2G_DISABLED, ah->status);
170         }
171
172         ret = ath5k_init_softc(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         platform_set_drvdata(pdev, NULL);
186  err_out:
187         return ret;
188 }
189
190 static int ath_ahb_remove(struct platform_device *pdev)
191 {
192         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
193         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
194         struct ath5k_hw *ah;
195         u32 reg;
196
197         if (!hw)
198                 return 0;
199
200         ah = hw->priv;
201
202         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
203                 /* Disable WMAC AHB arbitration */
204                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
205                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
206                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
207         } else {
208                 /*Stop DMA access */
209                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
210                 if (to_platform_device(ah->dev)->id == 0)
211                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
212                 else
213                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
214                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
215         }
216
217         ath5k_deinit_softc(ah);
218         platform_set_drvdata(pdev, NULL);
219         ieee80211_free_hw(hw);
220
221         return 0;
222 }
223
224 static struct platform_driver ath_ahb_driver = {
225         .probe      = ath_ahb_probe,
226         .remove     = ath_ahb_remove,
227         .driver         = {
228                 .name   = "ar231x-wmac",
229                 .owner  = THIS_MODULE,
230         },
231 };
232
233 static int __init
234 ath5k_ahb_init(void)
235 {
236         return platform_driver_register(&ath_ahb_driver);
237 }
238
239 static void __exit
240 ath5k_ahb_exit(void)
241 {
242         platform_driver_unregister(&ath_ahb_driver);
243 }
244
245 module_init(ath5k_ahb_init);
246 module_exit(ath5k_ahb_exit);