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Linux/drivers/net/wireless/ti/wlcore/sdio.c

  1 /*
  2  * This file is part of wl1271
  3  *
  4  * Copyright (C) 2009-2010 Nokia Corporation
  5  *
  6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License
 10  * version 2 as published by the Free Software Foundation.
 11  *
 12  * This program is distributed in the hope that it will be useful, but
 13  * WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15  * General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 20  * 02110-1301 USA
 21  *
 22  */
 23 
 24 #include <linux/irq.h>
 25 #include <linux/module.h>
 26 #include <linux/vmalloc.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/mmc/sdio.h>
 29 #include <linux/mmc/sdio_func.h>
 30 #include <linux/mmc/sdio_ids.h>
 31 #include <linux/mmc/card.h>
 32 #include <linux/mmc/host.h>
 33 #include <linux/gpio.h>
 34 #include <linux/wl12xx.h>
 35 #include <linux/pm_runtime.h>
 36 #include <linux/printk.h>
 37 
 38 #include "wlcore.h"
 39 #include "wl12xx_80211.h"
 40 #include "io.h"
 41 
 42 #ifndef SDIO_VENDOR_ID_TI
 43 #define SDIO_VENDOR_ID_TI               0x0097
 44 #endif
 45 
 46 #ifndef SDIO_DEVICE_ID_TI_WL1271
 47 #define SDIO_DEVICE_ID_TI_WL1271        0x4076
 48 #endif
 49 
 50 static bool dump = false;
 51 
 52 struct wl12xx_sdio_glue {
 53         struct device *dev;
 54         struct platform_device *core;
 55 };
 56 
 57 static const struct sdio_device_id wl1271_devices[] = {
 58         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271) },
 59         {}
 60 };
 61 MODULE_DEVICE_TABLE(sdio, wl1271_devices);
 62 
 63 static void wl1271_sdio_set_block_size(struct device *child,
 64                                        unsigned int blksz)
 65 {
 66         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 67         struct sdio_func *func = dev_to_sdio_func(glue->dev);
 68 
 69         sdio_claim_host(func);
 70         sdio_set_block_size(func, blksz);
 71         sdio_release_host(func);
 72 }
 73 
 74 static int __must_check wl12xx_sdio_raw_read(struct device *child, int addr,
 75                                              void *buf, size_t len, bool fixed)
 76 {
 77         int ret;
 78         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 79         struct sdio_func *func = dev_to_sdio_func(glue->dev);
 80 
 81         sdio_claim_host(func);
 82 
 83         if (unlikely(dump)) {
 84                 printk(KERN_DEBUG "wlcore_sdio: READ from 0x%04x\n", addr);
 85                 print_hex_dump(KERN_DEBUG, "wlcore_sdio: READ ",
 86                                 DUMP_PREFIX_OFFSET, 16, 1,
 87                                 buf, len, false);
 88         }
 89 
 90         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
 91                 ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
 92                 dev_dbg(child->parent, "sdio read 52 addr 0x%x, byte 0x%02x\n",
 93                         addr, ((u8 *)buf)[0]);
 94         } else {
 95                 if (fixed)
 96                         ret = sdio_readsb(func, buf, addr, len);
 97                 else
 98                         ret = sdio_memcpy_fromio(func, buf, addr, len);
 99 
100                 dev_dbg(child->parent, "sdio read 53 addr 0x%x, %zu bytes\n",
101                         addr, len);
102         }
103 
104         sdio_release_host(func);
105 
106         if (WARN_ON(ret))
107                 dev_err(child->parent, "sdio read failed (%d)\n", ret);
108 
109         return ret;
110 }
111 
112 static int __must_check wl12xx_sdio_raw_write(struct device *child, int addr,
113                                               void *buf, size_t len, bool fixed)
114 {
115         int ret;
116         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
117         struct sdio_func *func = dev_to_sdio_func(glue->dev);
118 
119         sdio_claim_host(func);
120 
121         if (unlikely(dump)) {
122                 printk(KERN_DEBUG "wlcore_sdio: WRITE to 0x%04x\n", addr);
123                 print_hex_dump(KERN_DEBUG, "wlcore_sdio: WRITE ",
124                                 DUMP_PREFIX_OFFSET, 16, 1,
125                                 buf, len, false);
126         }
127 
128         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
129                 sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
130                 dev_dbg(child->parent, "sdio write 52 addr 0x%x, byte 0x%02x\n",
131                         addr, ((u8 *)buf)[0]);
132         } else {
133                 dev_dbg(child->parent, "sdio write 53 addr 0x%x, %zu bytes\n",
134                         addr, len);
135 
136                 if (fixed)
137                         ret = sdio_writesb(func, addr, buf, len);
138                 else
139                         ret = sdio_memcpy_toio(func, addr, buf, len);
140         }
141 
142         sdio_release_host(func);
143 
144         if (WARN_ON(ret))
145                 dev_err(child->parent, "sdio write failed (%d)\n", ret);
146 
147         return ret;
148 }
149 
150 static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue)
151 {
152         int ret;
153         struct sdio_func *func = dev_to_sdio_func(glue->dev);
154         struct mmc_card *card = func->card;
155 
156         ret = pm_runtime_get_sync(&card->dev);
157         if (ret) {
158                 /*
159                  * Runtime PM might be temporarily disabled, or the device
160                  * might have a positive reference counter. Make sure it is
161                  * really powered on.
162                  */
163                 ret = mmc_power_restore_host(card->host);
164                 if (ret < 0) {
165                         pm_runtime_put_sync(&card->dev);
166                         goto out;
167                 }
168         }
169 
170         sdio_claim_host(func);
171         sdio_enable_func(func);
172         sdio_release_host(func);
173 
174 out:
175         return ret;
176 }
177 
178 static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
179 {
180         int ret;
181         struct sdio_func *func = dev_to_sdio_func(glue->dev);
182         struct mmc_card *card = func->card;
183 
184         sdio_claim_host(func);
185         sdio_disable_func(func);
186         sdio_release_host(func);
187 
188         /* Power off the card manually in case it wasn't powered off above */
189         ret = mmc_power_save_host(card->host);
190         if (ret < 0)
191                 goto out;
192 
193         /* Let runtime PM know the card is powered off */
194         pm_runtime_put_sync(&card->dev);
195 
196 out:
197         return ret;
198 }
199 
200 static int wl12xx_sdio_set_power(struct device *child, bool enable)
201 {
202         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
203 
204         if (enable)
205                 return wl12xx_sdio_power_on(glue);
206         else
207                 return wl12xx_sdio_power_off(glue);
208 }
209 
210 static struct wl1271_if_operations sdio_ops = {
211         .read           = wl12xx_sdio_raw_read,
212         .write          = wl12xx_sdio_raw_write,
213         .power          = wl12xx_sdio_set_power,
214         .set_block_size = wl1271_sdio_set_block_size,
215 };
216 
217 static int wl1271_probe(struct sdio_func *func,
218                                   const struct sdio_device_id *id)
219 {
220         struct wlcore_platdev_data *pdev_data;
221         struct wl12xx_sdio_glue *glue;
222         struct resource res[1];
223         mmc_pm_flag_t mmcflags;
224         int ret = -ENOMEM;
225         const char *chip_family;
226 
227         /* We are only able to handle the wlan function */
228         if (func->num != 0x02)
229                 return -ENODEV;
230 
231         pdev_data = kzalloc(sizeof(*pdev_data), GFP_KERNEL);
232         if (!pdev_data)
233                 goto out;
234 
235         pdev_data->if_ops = &sdio_ops;
236 
237         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
238         if (!glue) {
239                 dev_err(&func->dev, "can't allocate glue\n");
240                 goto out_free_pdev_data;
241         }
242 
243         glue->dev = &func->dev;
244 
245         /* Grab access to FN0 for ELP reg. */
246         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
247 
248         /* Use block mode for transferring over one block size of data */
249         func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
250 
251         pdev_data->pdata = wl12xx_get_platform_data();
252         if (IS_ERR(pdev_data->pdata)) {
253                 ret = PTR_ERR(pdev_data->pdata);
254                 dev_err(glue->dev, "missing wlan platform data: %d\n", ret);
255                 goto out_free_glue;
256         }
257 
258         /* if sdio can keep power while host is suspended, enable wow */
259         mmcflags = sdio_get_host_pm_caps(func);
260         dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags);
261 
262         if (mmcflags & MMC_PM_KEEP_POWER)
263                 pdev_data->pdata->pwr_in_suspend = true;
264 
265         sdio_set_drvdata(func, glue);
266 
267         /* Tell PM core that we don't need the card to be powered now */
268         pm_runtime_put_noidle(&func->dev);
269 
270         /*
271          * Due to a hardware bug, we can't differentiate wl18xx from
272          * wl12xx, because both report the same device ID.  The only
273          * way to differentiate is by checking the SDIO revision,
274          * which is 3.00 on the wl18xx chips.
275          */
276         if (func->card->cccr.sdio_vsn == SDIO_SDIO_REV_3_00)
277                 chip_family = "wl18xx";
278         else
279                 chip_family = "wl12xx";
280 
281         glue->core = platform_device_alloc(chip_family, PLATFORM_DEVID_AUTO);
282         if (!glue->core) {
283                 dev_err(glue->dev, "can't allocate platform_device");
284                 ret = -ENOMEM;
285                 goto out_free_glue;
286         }
287 
288         glue->core->dev.parent = &func->dev;
289 
290         memset(res, 0x00, sizeof(res));
291 
292         res[0].start = pdev_data->pdata->irq;
293         res[0].flags = IORESOURCE_IRQ;
294         res[0].name = "irq";
295 
296         ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
297         if (ret) {
298                 dev_err(glue->dev, "can't add resources\n");
299                 goto out_dev_put;
300         }
301 
302         ret = platform_device_add_data(glue->core, pdev_data,
303                                        sizeof(*pdev_data));
304         if (ret) {
305                 dev_err(glue->dev, "can't add platform data\n");
306                 goto out_dev_put;
307         }
308 
309         ret = platform_device_add(glue->core);
310         if (ret) {
311                 dev_err(glue->dev, "can't add platform device\n");
312                 goto out_dev_put;
313         }
314         return 0;
315 
316 out_dev_put:
317         platform_device_put(glue->core);
318 
319 out_free_glue:
320         kfree(glue);
321 
322 out_free_pdev_data:
323         kfree(pdev_data);
324 
325 out:
326         return ret;
327 }
328 
329 static void wl1271_remove(struct sdio_func *func)
330 {
331         struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
332 
333         /* Undo decrement done above in wl1271_probe */
334         pm_runtime_get_noresume(&func->dev);
335 
336         platform_device_unregister(glue->core);
337         kfree(glue);
338 }
339 
340 #ifdef CONFIG_PM
341 static int wl1271_suspend(struct device *dev)
342 {
343         /* Tell MMC/SDIO core it's OK to power down the card
344          * (if it isn't already), but not to remove it completely */
345         struct sdio_func *func = dev_to_sdio_func(dev);
346         struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
347         struct wl1271 *wl = platform_get_drvdata(glue->core);
348         mmc_pm_flag_t sdio_flags;
349         int ret = 0;
350 
351         dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n",
352                 wl->wow_enabled);
353 
354         /* check whether sdio should keep power */
355         if (wl->wow_enabled) {
356                 sdio_flags = sdio_get_host_pm_caps(func);
357 
358                 if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
359                         dev_err(dev, "can't keep power while host "
360                                      "is suspended\n");
361                         ret = -EINVAL;
362                         goto out;
363                 }
364 
365                 /* keep power while host suspended */
366                 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
367                 if (ret) {
368                         dev_err(dev, "error while trying to keep power\n");
369                         goto out;
370                 }
371         }
372 out:
373         return ret;
374 }
375 
376 static int wl1271_resume(struct device *dev)
377 {
378         dev_dbg(dev, "wl1271 resume\n");
379 
380         return 0;
381 }
382 
383 static const struct dev_pm_ops wl1271_sdio_pm_ops = {
384         .suspend        = wl1271_suspend,
385         .resume         = wl1271_resume,
386 };
387 #endif
388 
389 static struct sdio_driver wl1271_sdio_driver = {
390         .name           = "wl1271_sdio",
391         .id_table       = wl1271_devices,
392         .probe          = wl1271_probe,
393         .remove         = wl1271_remove,
394 #ifdef CONFIG_PM
395         .drv = {
396                 .pm = &wl1271_sdio_pm_ops,
397         },
398 #endif
399 };
400 
401 static int __init wl1271_init(void)
402 {
403         return sdio_register_driver(&wl1271_sdio_driver);
404 }
405 
406 static void __exit wl1271_exit(void)
407 {
408         sdio_unregister_driver(&wl1271_sdio_driver);
409 }
410 
411 module_init(wl1271_init);
412 module_exit(wl1271_exit);
413 
414 module_param(dump, bool, S_IRUSR | S_IWUSR);
415 MODULE_PARM_DESC(dump, "Enable sdio read/write dumps.");
416 
417 MODULE_LICENSE("GPL");
418 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
419 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
420 

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