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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/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 
220 static const struct wilink_family_data wl127x_data = {
221         .name = "wl127x",
222         .nvs_name = "ti-connectivity/wl127x-nvs.bin",
223 };
224 
225 static const struct wilink_family_data wl128x_data = {
226         .name = "wl128x",
227         .nvs_name = "ti-connectivity/wl128x-nvs.bin",
228 };
229 
230 static const struct wilink_family_data wl18xx_data = {
231         .name = "wl18xx",
232         .cfg_name = "ti-connectivity/wl18xx-conf.bin",
233 };
234 
235 static const struct of_device_id wlcore_sdio_of_match_table[] = {
236         { .compatible = "ti,wl1271", .data = &wl127x_data },
237         { .compatible = "ti,wl1273", .data = &wl127x_data },
238         { .compatible = "ti,wl1281", .data = &wl128x_data },
239         { .compatible = "ti,wl1283", .data = &wl128x_data },
240         { .compatible = "ti,wl1801", .data = &wl18xx_data },
241         { .compatible = "ti,wl1805", .data = &wl18xx_data },
242         { .compatible = "ti,wl1807", .data = &wl18xx_data },
243         { .compatible = "ti,wl1831", .data = &wl18xx_data },
244         { .compatible = "ti,wl1835", .data = &wl18xx_data },
245         { .compatible = "ti,wl1837", .data = &wl18xx_data },
246         { }
247 };
248 
249 static int wlcore_probe_of(struct device *dev, int *irq,
250                            struct wlcore_platdev_data *pdev_data)
251 {
252         struct device_node *np = dev->of_node;
253         const struct of_device_id *of_id;
254 
255         of_id = of_match_node(wlcore_sdio_of_match_table, np);
256         if (!of_id)
257                 return -ENODEV;
258 
259         pdev_data->family = of_id->data;
260 
261         *irq = irq_of_parse_and_map(np, 0);
262         if (!*irq) {
263                 dev_err(dev, "No irq in platform data\n");
264                 return -EINVAL;
265         }
266 
267         /* optional clock frequency params */
268         of_property_read_u32(np, "ref-clock-frequency",
269                              &pdev_data->ref_clock_freq);
270         of_property_read_u32(np, "tcxo-clock-frequency",
271                              &pdev_data->tcxo_clock_freq);
272 
273         return 0;
274 }
275 #else
276 static int wlcore_probe_of(struct device *dev, int *irq,
277                            struct wlcore_platdev_data *pdev_data)
278 {
279         return -ENODATA;
280 }
281 #endif
282 
283 static int wl1271_probe(struct sdio_func *func,
284                                   const struct sdio_device_id *id)
285 {
286         struct wlcore_platdev_data *pdev_data;
287         struct wl12xx_sdio_glue *glue;
288         struct resource res[1];
289         mmc_pm_flag_t mmcflags;
290         int ret = -ENOMEM;
291         int irq;
292         const char *chip_family;
293 
294         /* We are only able to handle the wlan function */
295         if (func->num != 0x02)
296                 return -ENODEV;
297 
298         pdev_data = devm_kzalloc(&func->dev, sizeof(*pdev_data), GFP_KERNEL);
299         if (!pdev_data)
300                 return -ENOMEM;
301 
302         pdev_data->if_ops = &sdio_ops;
303 
304         glue = devm_kzalloc(&func->dev, sizeof(*glue), GFP_KERNEL);
305         if (!glue)
306                 return -ENOMEM;
307 
308         glue->dev = &func->dev;
309 
310         /* Grab access to FN0 for ELP reg. */
311         func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
312 
313         /* Use block mode for transferring over one block size of data */
314         func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE;
315 
316         ret = wlcore_probe_of(&func->dev, &irq, pdev_data);
317         if (ret)
318                 goto out;
319 
320         /* if sdio can keep power while host is suspended, enable wow */
321         mmcflags = sdio_get_host_pm_caps(func);
322         dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags);
323 
324         if (mmcflags & MMC_PM_KEEP_POWER)
325                 pdev_data->pwr_in_suspend = true;
326 
327         sdio_set_drvdata(func, glue);
328 
329         /* Tell PM core that we don't need the card to be powered now */
330         pm_runtime_put_noidle(&func->dev);
331 
332         /*
333          * Due to a hardware bug, we can't differentiate wl18xx from
334          * wl12xx, because both report the same device ID.  The only
335          * way to differentiate is by checking the SDIO revision,
336          * which is 3.00 on the wl18xx chips.
337          */
338         if (func->card->cccr.sdio_vsn == SDIO_SDIO_REV_3_00)
339                 chip_family = "wl18xx";
340         else
341                 chip_family = "wl12xx";
342 
343         glue->core = platform_device_alloc(chip_family, PLATFORM_DEVID_AUTO);
344         if (!glue->core) {
345                 dev_err(glue->dev, "can't allocate platform_device");
346                 ret = -ENOMEM;
347                 goto out;
348         }
349 
350         glue->core->dev.parent = &func->dev;
351 
352         memset(res, 0x00, sizeof(res));
353 
354         res[0].start = irq;
355         res[0].flags = IORESOURCE_IRQ |
356                        irqd_get_trigger_type(irq_get_irq_data(irq));
357         res[0].name = "irq";
358 
359         ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
360         if (ret) {
361                 dev_err(glue->dev, "can't add resources\n");
362                 goto out_dev_put;
363         }
364 
365         ret = platform_device_add_data(glue->core, pdev_data,
366                                        sizeof(*pdev_data));
367         if (ret) {
368                 dev_err(glue->dev, "can't add platform data\n");
369                 goto out_dev_put;
370         }
371 
372         ret = platform_device_add(glue->core);
373         if (ret) {
374                 dev_err(glue->dev, "can't add platform device\n");
375                 goto out_dev_put;
376         }
377         return 0;
378 
379 out_dev_put:
380         platform_device_put(glue->core);
381 
382 out:
383         return ret;
384 }
385 
386 static void wl1271_remove(struct sdio_func *func)
387 {
388         struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
389 
390         /* Undo decrement done above in wl1271_probe */
391         pm_runtime_get_noresume(&func->dev);
392 
393         platform_device_unregister(glue->core);
394 }
395 
396 #ifdef CONFIG_PM
397 static int wl1271_suspend(struct device *dev)
398 {
399         /* Tell MMC/SDIO core it's OK to power down the card
400          * (if it isn't already), but not to remove it completely */
401         struct sdio_func *func = dev_to_sdio_func(dev);
402         struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func);
403         struct wl1271 *wl = platform_get_drvdata(glue->core);
404         mmc_pm_flag_t sdio_flags;
405         int ret = 0;
406 
407         dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n",
408                 wl->wow_enabled);
409 
410         /* check whether sdio should keep power */
411         if (wl->wow_enabled) {
412                 sdio_flags = sdio_get_host_pm_caps(func);
413 
414                 if (!(sdio_flags & MMC_PM_KEEP_POWER)) {
415                         dev_err(dev, "can't keep power while host "
416                                      "is suspended\n");
417                         ret = -EINVAL;
418                         goto out;
419                 }
420 
421                 /* keep power while host suspended */
422                 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
423                 if (ret) {
424                         dev_err(dev, "error while trying to keep power\n");
425                         goto out;
426                 }
427         }
428 out:
429         return ret;
430 }
431 
432 static int wl1271_resume(struct device *dev)
433 {
434         dev_dbg(dev, "wl1271 resume\n");
435 
436         return 0;
437 }
438 
439 static const struct dev_pm_ops wl1271_sdio_pm_ops = {
440         .suspend        = wl1271_suspend,
441         .resume         = wl1271_resume,
442 };
443 #endif
444 
445 static struct sdio_driver wl1271_sdio_driver = {
446         .name           = "wl1271_sdio",
447         .id_table       = wl1271_devices,
448         .probe          = wl1271_probe,
449         .remove         = wl1271_remove,
450 #ifdef CONFIG_PM
451         .drv = {
452                 .pm = &wl1271_sdio_pm_ops,
453         },
454 #endif
455 };
456 
457 static int __init wl1271_init(void)
458 {
459         return sdio_register_driver(&wl1271_sdio_driver);
460 }
461 
462 static void __exit wl1271_exit(void)
463 {
464         sdio_unregister_driver(&wl1271_sdio_driver);
465 }
466 
467 module_init(wl1271_init);
468 module_exit(wl1271_exit);
469 
470 module_param(dump, bool, S_IRUSR | S_IWUSR);
471 MODULE_PARM_DESC(dump, "Enable sdio read/write dumps.");
472 
473 MODULE_LICENSE("GPL");
474 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
475 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
476 

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