Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

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/pm_runtime.h>
 35 #include <linux/printk.h>
 36 #include <linux/of.h>
 37 #include <linux/of_irq.h>
 38 
 39 #include "wlcore.h"
 40 #include "wl12xx_80211.h"
 41 #include "io.h"
 42 
 43 #ifndef SDIO_VENDOR_ID_TI
 44 #define SDIO_VENDOR_ID_TI               0x0097
 45 #endif
 46 
 47 #ifndef SDIO_DEVICE_ID_TI_WL1271
 48 #define SDIO_DEVICE_ID_TI_WL1271        0x4076
 49 #endif
 50 
 51 static bool dump = false;
 52 
 53 struct wl12xx_sdio_glue {
 54         struct device *dev;
 55         struct platform_device *core;
 56 };
 57 
 58 static const struct sdio_device_id wl1271_devices[] = {
 59         { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271) },
 60         {}
 61 };
 62 MODULE_DEVICE_TABLE(sdio, wl1271_devices);
 63 
 64 static void wl1271_sdio_set_block_size(struct device *child,
 65                                        unsigned int blksz)
 66 {
 67         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 68         struct sdio_func *func = dev_to_sdio_func(glue->dev);
 69 
 70         sdio_claim_host(func);
 71         sdio_set_block_size(func, blksz);
 72         sdio_release_host(func);
 73 }
 74 
 75 static int __must_check wl12xx_sdio_raw_read(struct device *child, int addr,
 76                                              void *buf, size_t len, bool fixed)
 77 {
 78         int ret;
 79         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
 80         struct sdio_func *func = dev_to_sdio_func(glue->dev);
 81 
 82         sdio_claim_host(func);
 83 
 84         if (unlikely(dump)) {
 85                 printk(KERN_DEBUG "wlcore_sdio: READ from 0x%04x\n", addr);
 86                 print_hex_dump(KERN_DEBUG, "wlcore_sdio: READ ",
 87                                 DUMP_PREFIX_OFFSET, 16, 1,
 88                                 buf, len, false);
 89         }
 90 
 91         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
 92                 ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret);
 93                 dev_dbg(child->parent, "sdio read 52 addr 0x%x, byte 0x%02x\n",
 94                         addr, ((u8 *)buf)[0]);
 95         } else {
 96                 if (fixed)
 97                         ret = sdio_readsb(func, buf, addr, len);
 98                 else
 99                         ret = sdio_memcpy_fromio(func, buf, addr, len);
100 
101                 dev_dbg(child->parent, "sdio read 53 addr 0x%x, %zu bytes\n",
102                         addr, len);
103         }
104 
105         sdio_release_host(func);
106 
107         if (WARN_ON(ret))
108                 dev_err(child->parent, "sdio read failed (%d)\n", ret);
109 
110         return ret;
111 }
112 
113 static int __must_check wl12xx_sdio_raw_write(struct device *child, int addr,
114                                               void *buf, size_t len, bool fixed)
115 {
116         int ret;
117         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
118         struct sdio_func *func = dev_to_sdio_func(glue->dev);
119 
120         sdio_claim_host(func);
121 
122         if (unlikely(dump)) {
123                 printk(KERN_DEBUG "wlcore_sdio: WRITE to 0x%04x\n", addr);
124                 print_hex_dump(KERN_DEBUG, "wlcore_sdio: WRITE ",
125                                 DUMP_PREFIX_OFFSET, 16, 1,
126                                 buf, len, false);
127         }
128 
129         if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) {
130                 sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret);
131                 dev_dbg(child->parent, "sdio write 52 addr 0x%x, byte 0x%02x\n",
132                         addr, ((u8 *)buf)[0]);
133         } else {
134                 dev_dbg(child->parent, "sdio write 53 addr 0x%x, %zu bytes\n",
135                         addr, len);
136 
137                 if (fixed)
138                         ret = sdio_writesb(func, addr, buf, len);
139                 else
140                         ret = sdio_memcpy_toio(func, addr, buf, len);
141         }
142 
143         sdio_release_host(func);
144 
145         if (WARN_ON(ret))
146                 dev_err(child->parent, "sdio write failed (%d)\n", ret);
147 
148         return ret;
149 }
150 
151 static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue)
152 {
153         int ret;
154         struct sdio_func *func = dev_to_sdio_func(glue->dev);
155         struct mmc_card *card = func->card;
156 
157         ret = pm_runtime_get_sync(&card->dev);
158         if (ret) {
159                 /*
160                  * Runtime PM might be temporarily disabled, or the device
161                  * might have a positive reference counter. Make sure it is
162                  * really powered on.
163                  */
164                 ret = mmc_power_restore_host(card->host);
165                 if (ret < 0) {
166                         pm_runtime_put_sync(&card->dev);
167                         goto out;
168                 }
169         }
170 
171         sdio_claim_host(func);
172         sdio_enable_func(func);
173         sdio_release_host(func);
174 
175 out:
176         return ret;
177 }
178 
179 static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue)
180 {
181         int ret;
182         struct sdio_func *func = dev_to_sdio_func(glue->dev);
183         struct mmc_card *card = func->card;
184 
185         sdio_claim_host(func);
186         sdio_disable_func(func);
187         sdio_release_host(func);
188 
189         /* Power off the card manually in case it wasn't powered off above */
190         ret = mmc_power_save_host(card->host);
191         if (ret < 0)
192                 goto out;
193 
194         /* Let runtime PM know the card is powered off */
195         pm_runtime_put_sync(&card->dev);
196 
197 out:
198         return ret;
199 }
200 
201 static int wl12xx_sdio_set_power(struct device *child, bool enable)
202 {
203         struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent);
204 
205         if (enable)
206                 return wl12xx_sdio_power_on(glue);
207         else
208                 return wl12xx_sdio_power_off(glue);
209 }
210 
211 static struct wl1271_if_operations sdio_ops = {
212         .read           = wl12xx_sdio_raw_read,
213         .write          = wl12xx_sdio_raw_write,
214         .power          = wl12xx_sdio_set_power,
215         .set_block_size = wl1271_sdio_set_block_size,
216 };
217 
218 #ifdef CONFIG_OF
219 static const struct of_device_id wlcore_sdio_of_match_table[] = {
220         { .compatible = "ti,wl1271" },
221         { .compatible = "ti,wl1273" },
222         { .compatible = "ti,wl1281" },
223         { .compatible = "ti,wl1283" },
224         { .compatible = "ti,wl1801" },
225         { .compatible = "ti,wl1805" },
226         { .compatible = "ti,wl1807" },
227         { .compatible = "ti,wl1831" },
228         { .compatible = "ti,wl1835" },
229         { .compatible = "ti,wl1837" },
230         { }
231 };
232 
233 static int wlcore_probe_of(struct device *dev, int *irq,
234                            struct wlcore_platdev_data *pdev_data)
235 {
236         struct device_node *np = dev->of_node;
237 
238         if (!np || !of_match_node(wlcore_sdio_of_match_table, np))
239                 return -ENODATA;
240 
241         *irq = irq_of_parse_and_map(np, 0);
242         if (!*irq) {
243                 dev_err(dev, "No irq in platform data\n");
244                 kfree(pdev_data);
245                 return -EINVAL;
246         }
247 
248         /* optional clock frequency params */
249         of_property_read_u32(np, "ref-clock-frequency",
250                              &pdev_data->ref_clock_freq);
251         of_property_read_u32(np, "tcxo-clock-frequency",
252                              &pdev_data->tcxo_clock_freq);
253 
254         return 0;
255 }
256 #else
257 static int wlcore_probe_of(struct device *dev, int *irq,
258                            struct wlcore_platdev_data *pdev_data)
259 {
260         return -ENODATA;
261 }
262 #endif
263 
264 static int wl1271_probe(struct sdio_func *func,
265                                   const struct sdio_device_id *id)
266 {
267         struct wlcore_platdev_data pdev_data;
268         struct wl12xx_sdio_glue *glue;
269         struct resource res[1];
270         mmc_pm_flag_t mmcflags;
271         int ret = -ENOMEM;
272         int irq;
273         const char *chip_family;
274 
275         /* We are only able to handle the wlan function */
276         if (func->num != 0x02)
277                 return -ENODEV;
278 
279         memset(&pdev_data, 0x00, sizeof(pdev_data));
280         pdev_data.if_ops = &sdio_ops;
281 
282         glue = kzalloc(sizeof(*glue), GFP_KERNEL);
283         if (!glue) {
284                 dev_err(&func->dev, "can't allocate glue\n");
285                 goto out;
286         }
287 
288         glue->dev = &func->dev;
289 
290         /* Grab access to FN0 for ELP reg. */
291         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
292 
293         /* Use block mode for transferring over one block size of data */
294         func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
295 
296         if (wlcore_probe_of(&func->dev, &irq, &pdev_data))
297                 goto out_free_glue;
298 
299         /* if sdio can keep power while host is suspended, enable wow */
300         mmcflags = sdio_get_host_pm_caps(func);
301         dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags);
302 
303         if (mmcflags & MMC_PM_KEEP_POWER)
304                 pdev_data.pwr_in_suspend = true;
305 
306         sdio_set_drvdata(func, glue);
307 
308         /* Tell PM core that we don't need the card to be powered now */
309         pm_runtime_put_noidle(&func->dev);
310 
311         /*
312          * Due to a hardware bug, we can't differentiate wl18xx from
313          * wl12xx, because both report the same device ID.  The only
314          * way to differentiate is by checking the SDIO revision,
315          * which is 3.00 on the wl18xx chips.
316          */
317         if (func->card->cccr.sdio_vsn == SDIO_SDIO_REV_3_00)
318                 chip_family = "wl18xx";
319         else
320                 chip_family = "wl12xx";
321 
322         glue->core = platform_device_alloc(chip_family, PLATFORM_DEVID_AUTO);
323         if (!glue->core) {
324                 dev_err(glue->dev, "can't allocate platform_device");
325                 ret = -ENOMEM;
326                 goto out_free_glue;
327         }
328 
329         glue->core->dev.parent = &func->dev;
330 
331         memset(res, 0x00, sizeof(res));
332 
333         res[0].start = irq;
334         res[0].flags = IORESOURCE_IRQ |
335                        irqd_get_trigger_type(irq_get_irq_data(irq));
336         res[0].name = "irq";
337 
338         ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
339         if (ret) {
340                 dev_err(glue->dev, "can't add resources\n");
341                 goto out_dev_put;
342         }
343 
344         ret = platform_device_add_data(glue->core, &pdev_data,
345                                        sizeof(pdev_data));
346         if (ret) {
347                 dev_err(glue->dev, "can't add platform data\n");
348                 goto out_dev_put;
349         }
350 
351         ret = platform_device_add(glue->core);
352         if (ret) {
353                 dev_err(glue->dev, "can't add platform device\n");
354                 goto out_dev_put;
355         }
356         return 0;
357 
358 out_dev_put:
359         platform_device_put(glue->core);
360 
361 out_free_glue:
362         kfree(glue);
363 
364 out:
365         return ret;
366 }
367 
368 static void wl1271_remove(struct sdio_func *func)
369 {
370         struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
371 
372         /* Undo decrement done above in wl1271_probe */
373         pm_runtime_get_noresume(&func->dev);
374 
375         platform_device_unregister(glue->core);
376         kfree(glue);
377 }
378 
379 #ifdef CONFIG_PM
380 static int wl1271_suspend(struct device *dev)
381 {
382         /* Tell MMC/SDIO core it's OK to power down the card
383          * (if it isn't already), but not to remove it completely */
384         struct sdio_func *func = dev_to_sdio_func(dev);
385         struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
386         struct wl1271 *wl = platform_get_drvdata(glue->core);
387         mmc_pm_flag_t sdio_flags;
388         int ret = 0;
389 
390         dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n",
391                 wl->wow_enabled);
392 
393         /* check whether sdio should keep power */
394         if (wl->wow_enabled) {
395                 sdio_flags = sdio_get_host_pm_caps(func);
396 
397                 if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
398                         dev_err(dev, "can't keep power while host "
399                                      "is suspended\n");
400                         ret = -EINVAL;
401                         goto out;
402                 }
403 
404                 /* keep power while host suspended */
405                 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
406                 if (ret) {
407                         dev_err(dev, "error while trying to keep power\n");
408                         goto out;
409                 }
410         }
411 out:
412         return ret;
413 }
414 
415 static int wl1271_resume(struct device *dev)
416 {
417         dev_dbg(dev, "wl1271 resume\n");
418 
419         return 0;
420 }
421 
422 static const struct dev_pm_ops wl1271_sdio_pm_ops = {
423         .suspend        = wl1271_suspend,
424         .resume         = wl1271_resume,
425 };
426 #endif
427 
428 static struct sdio_driver wl1271_sdio_driver = {
429         .name           = "wl1271_sdio",
430         .id_table       = wl1271_devices,
431         .probe          = wl1271_probe,
432         .remove         = wl1271_remove,
433 #ifdef CONFIG_PM
434         .drv = {
435                 .pm = &wl1271_sdio_pm_ops,
436         },
437 #endif
438 };
439 
440 static int __init wl1271_init(void)
441 {
442         return sdio_register_driver(&wl1271_sdio_driver);
443 }
444 
445 static void __exit wl1271_exit(void)
446 {
447         sdio_unregister_driver(&wl1271_sdio_driver);
448 }
449 
450 module_init(wl1271_init);
451 module_exit(wl1271_exit);
452 
453 module_param(dump, bool, S_IRUSR | S_IWUSR);
454 MODULE_PARM_DESC(dump, "Enable sdio read/write dumps.");
455 
456 MODULE_LICENSE("GPL");
457 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
458 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
459 

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