Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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 #include "debug.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_softc *sc = common->priv;
39         struct platform_device *pdev = to_platform_device(sc->dev);
40         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
41         u16 *eeprom, *eeprom_end;
42
43
44
45         bcfg = pdev->dev.platform_data;
46         eeprom = (u16 *) bcfg->radio;
47         eeprom_end = ((void *) bcfg->config) + BOARD_CONFIG_BUFSZ;
48
49         eeprom += off;
50         if (eeprom > eeprom_end)
51                 return false;
52
53         *data = *eeprom;
54         return true;
55 }
56
57 int ath5k_hw_read_srev(struct ath5k_hw *ah)
58 {
59         struct ath5k_softc *sc = ah->ah_sc;
60         struct platform_device *pdev = to_platform_device(sc->dev);
61         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
62         ah->ah_mac_srev = bcfg->devid;
63         return 0;
64 }
65
66 static int ath5k_ahb_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac)
67 {
68         struct ath5k_softc *sc = ah->ah_sc;
69         struct platform_device *pdev = to_platform_device(sc->dev);
70         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
71         u8 *cfg_mac;
72
73         if (to_platform_device(sc->dev)->id == 0)
74                 cfg_mac = bcfg->config->wlan0_mac;
75         else
76                 cfg_mac = bcfg->config->wlan1_mac;
77
78         memcpy(mac, cfg_mac, ETH_ALEN);
79         return 0;
80 }
81
82 static const struct ath_bus_ops ath_ahb_bus_ops = {
83         .ath_bus_type = ATH_AHB,
84         .read_cachesize = ath5k_ahb_read_cachesize,
85         .eeprom_read = ath5k_ahb_eeprom_read,
86         .eeprom_read_mac = ath5k_ahb_eeprom_read_mac,
87 };
88
89 /*Initialization*/
90 static int ath_ahb_probe(struct platform_device *pdev)
91 {
92         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
93         struct ath5k_softc *sc;
94         struct ieee80211_hw *hw;
95         struct resource *res;
96         void __iomem *mem;
97         int irq;
98         int ret = 0;
99         u32 reg;
100
101         if (!pdev->dev.platform_data) {
102                 dev_err(&pdev->dev, "no platform data specified\n");
103                 ret = -EINVAL;
104                 goto err_out;
105         }
106
107         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
108         if (res == NULL) {
109                 dev_err(&pdev->dev, "no memory resource found\n");
110                 ret = -ENXIO;
111                 goto err_out;
112         }
113
114         mem = ioremap_nocache(res->start, resource_size(res));
115         if (mem == NULL) {
116                 dev_err(&pdev->dev, "ioremap failed\n");
117                 ret = -ENOMEM;
118                 goto err_out;
119         }
120
121         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
122         if (res == NULL) {
123                 dev_err(&pdev->dev, "no IRQ resource found\n");
124                 ret = -ENXIO;
125                 goto err_out;
126         }
127
128         irq = res->start;
129
130         hw = ieee80211_alloc_hw(sizeof(struct ath5k_softc), &ath5k_hw_ops);
131         if (hw == NULL) {
132                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
133                 ret = -ENOMEM;
134                 goto err_out;
135         }
136
137         sc = hw->priv;
138         sc->hw = hw;
139         sc->dev = &pdev->dev;
140         sc->iobase = mem;
141         sc->irq = irq;
142         sc->devid = bcfg->devid;
143
144         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
145                 /* Enable WMAC AHB arbitration */
146                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
147                 reg |= AR5K_AR2315_AHB_ARB_CTL_WLAN;
148                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
149
150                 /* Enable global WMAC swapping */
151                 reg = __raw_readl((void __iomem *) AR5K_AR2315_BYTESWAP);
152                 reg |= AR5K_AR2315_BYTESWAP_WMAC;
153                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_BYTESWAP);
154         } else {
155                 /* Enable WMAC DMA access (assuming 5312 or 231x*/
156                 /* TODO: check other platforms */
157                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
158                 if (to_platform_device(sc->dev)->id == 0)
159                         reg |= AR5K_AR5312_ENABLE_WLAN0;
160                 else
161                         reg |= AR5K_AR5312_ENABLE_WLAN1;
162                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
163
164                 /*
165                  * On a dual-band AR5312, the multiband radio is only
166                  * used as pass-through. Disable 2 GHz support in the
167                  * driver for it
168                  */
169                 if (to_platform_device(sc->dev)->id == 0 &&
170                     (bcfg->config->flags & (BD_WLAN0 | BD_WLAN1)) ==
171                      (BD_WLAN1 | BD_WLAN0))
172                         __set_bit(ATH_STAT_2G_DISABLED, sc->status);
173         }
174
175         ret = ath5k_init_softc(sc, &ath_ahb_bus_ops);
176         if (ret != 0) {
177                 dev_err(&pdev->dev, "failed to attach device, err=%d\n", ret);
178                 ret = -ENODEV;
179                 goto err_free_hw;
180         }
181
182         platform_set_drvdata(pdev, hw);
183
184         return 0;
185
186  err_free_hw:
187         ieee80211_free_hw(hw);
188         platform_set_drvdata(pdev, NULL);
189  err_out:
190         return ret;
191 }
192
193 static int ath_ahb_remove(struct platform_device *pdev)
194 {
195         struct ar231x_board_config *bcfg = pdev->dev.platform_data;
196         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
197         struct ath5k_softc *sc;
198         u32 reg;
199
200         if (!hw)
201                 return 0;
202
203         sc = hw->priv;
204
205         if (bcfg->devid >= AR5K_SREV_AR2315_R6) {
206                 /* Disable WMAC AHB arbitration */
207                 reg = __raw_readl((void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
208                 reg &= ~AR5K_AR2315_AHB_ARB_CTL_WLAN;
209                 __raw_writel(reg, (void __iomem *) AR5K_AR2315_AHB_ARB_CTL);
210         } else {
211                 /*Stop DMA access */
212                 reg = __raw_readl((void __iomem *) AR5K_AR5312_ENABLE);
213                 if (to_platform_device(sc->dev)->id == 0)
214                         reg &= ~AR5K_AR5312_ENABLE_WLAN0;
215                 else
216                         reg &= ~AR5K_AR5312_ENABLE_WLAN1;
217                 __raw_writel(reg, (void __iomem *) AR5K_AR5312_ENABLE);
218         }
219
220         ath5k_deinit_softc(sc);
221         platform_set_drvdata(pdev, NULL);
222         ieee80211_free_hw(hw);
223
224         return 0;
225 }
226
227 static struct platform_driver ath_ahb_driver = {
228         .probe      = ath_ahb_probe,
229         .remove     = ath_ahb_remove,
230         .driver         = {
231                 .name   = "ar231x-wmac",
232                 .owner  = THIS_MODULE,
233         },
234 };
235
236 static int __init
237 ath5k_ahb_init(void)
238 {
239         return platform_driver_register(&ath_ahb_driver);
240 }
241
242 static void __exit
243 ath5k_ahb_exit(void)
244 {
245         platform_driver_unregister(&ath_ahb_driver);
246 }
247
248 module_init(ath5k_ahb_init);
249 module_exit(ath5k_ahb_exit);