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

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