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Linux/drivers/net/wireless/ath/ath9k/ahb.c

  1 /*
  2  * Copyright (c) 2008-2011 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/ath9k_platform.h>
 22 #include <linux/module.h>
 23 #include "ath9k.h"
 24 
 25 static const struct platform_device_id ath9k_platform_id_table[] = {
 26         {
 27                 .name = "ath9k",
 28                 .driver_data = AR5416_AR9100_DEVID,
 29         },
 30         {
 31                 .name = "ar933x_wmac",
 32                 .driver_data = AR9300_DEVID_AR9330,
 33         },
 34         {
 35                 .name = "ar934x_wmac",
 36                 .driver_data = AR9300_DEVID_AR9340,
 37         },
 38         {
 39                 .name = "qca955x_wmac",
 40                 .driver_data = AR9300_DEVID_QCA955X,
 41         },
 42         {
 43                 .name = "qca953x_wmac",
 44                 .driver_data = AR9300_DEVID_AR953X,
 45         },
 46         {
 47                 .name = "qca956x_wmac",
 48                 .driver_data = AR9300_DEVID_QCA956X,
 49         },
 50         {},
 51 };
 52 
 53 /* return bus cachesize in 4B word units */
 54 static void ath_ahb_read_cachesize(struct ath_common *common, int *csz)
 55 {
 56         *csz = L1_CACHE_BYTES >> 2;
 57 }
 58 
 59 static bool ath_ahb_eeprom_read(struct ath_common *common, u32 off, u16 *data)
 60 {
 61         struct ath_softc *sc = (struct ath_softc *)common->priv;
 62         struct platform_device *pdev = to_platform_device(sc->dev);
 63         struct ath9k_platform_data *pdata;
 64 
 65         pdata = dev_get_platdata(&pdev->dev);
 66         if (off >= (ARRAY_SIZE(pdata->eeprom_data))) {
 67                 ath_err(common,
 68                         "%s: flash read failed, offset %08x is out of range\n",
 69                         __func__, off);
 70                 return false;
 71         }
 72 
 73         *data = pdata->eeprom_data[off];
 74         return true;
 75 }
 76 
 77 static struct ath_bus_ops ath_ahb_bus_ops  = {
 78         .ath_bus_type = ATH_AHB,
 79         .read_cachesize = ath_ahb_read_cachesize,
 80         .eeprom_read = ath_ahb_eeprom_read,
 81 };
 82 
 83 static int ath_ahb_probe(struct platform_device *pdev)
 84 {
 85         void __iomem *mem;
 86         struct ath_softc *sc;
 87         struct ieee80211_hw *hw;
 88         struct resource *res;
 89         const struct platform_device_id *id = platform_get_device_id(pdev);
 90         int irq;
 91         int ret = 0;
 92         struct ath_hw *ah;
 93         char hw_name[64];
 94 
 95         if (!dev_get_platdata(&pdev->dev)) {
 96                 dev_err(&pdev->dev, "no platform data specified\n");
 97                 return -EINVAL;
 98         }
 99 
100         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
101         if (res == NULL) {
102                 dev_err(&pdev->dev, "no memory resource found\n");
103                 return -ENXIO;
104         }
105 
106         mem = devm_ioremap_nocache(&pdev->dev, res->start, resource_size(res));
107         if (mem == NULL) {
108                 dev_err(&pdev->dev, "ioremap failed\n");
109                 return -ENOMEM;
110         }
111 
112         res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
113         if (res == NULL) {
114                 dev_err(&pdev->dev, "no IRQ resource found\n");
115                 return -ENXIO;
116         }
117 
118         irq = res->start;
119 
120         ath9k_fill_chanctx_ops();
121         hw = ieee80211_alloc_hw(sizeof(struct ath_softc), &ath9k_ops);
122         if (hw == NULL) {
123                 dev_err(&pdev->dev, "no memory for ieee80211_hw\n");
124                 return -ENOMEM;
125         }
126 
127         SET_IEEE80211_DEV(hw, &pdev->dev);
128         platform_set_drvdata(pdev, hw);
129 
130         sc = hw->priv;
131         sc->hw = hw;
132         sc->dev = &pdev->dev;
133         sc->mem = mem;
134         sc->irq = irq;
135 
136         ret = request_irq(irq, ath_isr, IRQF_SHARED, "ath9k", sc);
137         if (ret) {
138                 dev_err(&pdev->dev, "request_irq failed\n");
139                 goto err_free_hw;
140         }
141 
142         ret = ath9k_init_device(id->driver_data, sc, &ath_ahb_bus_ops);
143         if (ret) {
144                 dev_err(&pdev->dev, "failed to initialize device\n");
145                 goto err_irq;
146         }
147 
148         ah = sc->sc_ah;
149         ath9k_hw_name(ah, hw_name, sizeof(hw_name));
150         wiphy_info(hw->wiphy, "%s mem=0x%lx, irq=%d\n",
151                    hw_name, (unsigned long)mem, irq);
152 
153         return 0;
154 
155  err_irq:
156         free_irq(irq, sc);
157  err_free_hw:
158         ieee80211_free_hw(hw);
159         return ret;
160 }
161 
162 static int ath_ahb_remove(struct platform_device *pdev)
163 {
164         struct ieee80211_hw *hw = platform_get_drvdata(pdev);
165 
166         if (hw) {
167                 struct ath_softc *sc = hw->priv;
168 
169                 ath9k_deinit_device(sc);
170                 free_irq(sc->irq, sc);
171                 ieee80211_free_hw(sc->hw);
172         }
173 
174         return 0;
175 }
176 
177 static struct platform_driver ath_ahb_driver = {
178         .probe      = ath_ahb_probe,
179         .remove     = ath_ahb_remove,
180         .driver         = {
181                 .name   = "ath9k",
182         },
183         .id_table    = ath9k_platform_id_table,
184 };
185 
186 MODULE_DEVICE_TABLE(platform, ath9k_platform_id_table);
187 
188 int ath_ahb_init(void)
189 {
190         return platform_driver_register(&ath_ahb_driver);
191 }
192 
193 void ath_ahb_exit(void)
194 {
195         platform_driver_unregister(&ath_ahb_driver);
196 }
197 

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