1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * wl12xx SDIO routines
4 *
5 * Copyright (C) 2005 Texas Instruments Incorporated
6 * Copyright (C) 2008 Google Inc
7 * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com)
8 */
9#include <linux/interrupt.h>
10#include <linux/module.h>
11#include <linux/mod_devicetable.h>
12#include <linux/mmc/sdio_func.h>
13#include <linux/mmc/sdio_ids.h>
14#include <linux/platform_device.h>
15#include <linux/wl12xx.h>
16#include <linux/irq.h>
17#include <linux/pm_runtime.h>
18#include <linux/of.h>
19#include <linux/of_irq.h>
20
21#include "wl1251.h"
22
23struct wl1251_sdio {
24	struct sdio_func *func;
25	u32 elp_val;
26};
27
28static struct sdio_func *wl_to_func(struct wl1251 *wl)
29{
30	struct wl1251_sdio *wl_sdio = wl->if_priv;
31	return wl_sdio->func;
32}
33
34static void wl1251_sdio_interrupt(struct sdio_func *func)
35{
36	struct wl1251 *wl = sdio_get_drvdata(func);
37
38	wl1251_debug(DEBUG_IRQ, "IRQ");
39
40	/* FIXME should be synchronous for sdio */
41	ieee80211_queue_work(wl->hw, &wl->irq_work);
42}
43
44static const struct sdio_device_id wl1251_devices[] = {
45	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI_WL1251, SDIO_DEVICE_ID_TI_WL1251) },
46	{}
47};
48MODULE_DEVICE_TABLE(sdio, wl1251_devices);
49
50
51static void wl1251_sdio_read(struct wl1251 *wl, int addr,
52			     void *buf, size_t len)
53{
54	int ret;
55	struct sdio_func *func = wl_to_func(wl);
56
57	sdio_claim_host(func);
58	ret = sdio_memcpy_fromio(func, buf, addr, len);
59	if (ret)
60		wl1251_error("sdio read failed (%d)", ret);
61	sdio_release_host(func);
62}
63
64static void wl1251_sdio_write(struct wl1251 *wl, int addr,
65			      void *buf, size_t len)
66{
67	int ret;
68	struct sdio_func *func = wl_to_func(wl);
69
70	sdio_claim_host(func);
71	ret = sdio_memcpy_toio(func, addr, buf, len);
72	if (ret)
73		wl1251_error("sdio write failed (%d)", ret);
74	sdio_release_host(func);
75}
76
77static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
78{
79	int ret = 0;
80	struct wl1251_sdio *wl_sdio = wl->if_priv;
81	struct sdio_func *func = wl_sdio->func;
82
83	/*
84	 * The hardware only supports RAW (read after write) access for
85	 * reading, regular sdio_readb won't work here (it interprets
86	 * the unused bits of CMD52 as write data even if we send read
87	 * request).
88	 */
89	sdio_claim_host(func);
90	*val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
91	sdio_release_host(func);
92
93	if (ret)
94		wl1251_error("sdio_readb failed (%d)", ret);
95}
96
97static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
98{
99	int ret = 0;
100	struct wl1251_sdio *wl_sdio = wl->if_priv;
101	struct sdio_func *func = wl_sdio->func;
102
103	sdio_claim_host(func);
104	sdio_writeb(func, val, addr, &ret);
105	sdio_release_host(func);
106
107	if (ret)
108		wl1251_error("sdio_writeb failed (%d)", ret);
109	else
110		wl_sdio->elp_val = val;
111}
112
113static void wl1251_sdio_reset(struct wl1251 *wl)
114{
115}
116
117static void wl1251_sdio_enable_irq(struct wl1251 *wl)
118{
119	struct sdio_func *func = wl_to_func(wl);
120
121	sdio_claim_host(func);
122	sdio_claim_irq(func, wl1251_sdio_interrupt);
123	sdio_release_host(func);
124}
125
126static void wl1251_sdio_disable_irq(struct wl1251 *wl)
127{
128	struct sdio_func *func = wl_to_func(wl);
129
130	sdio_claim_host(func);
131	sdio_release_irq(func);
132	sdio_release_host(func);
133}
134
135/* Interrupts when using dedicated WLAN_IRQ pin */
136static irqreturn_t wl1251_line_irq(int irq, void *cookie)
137{
138	struct wl1251 *wl = cookie;
139
140	ieee80211_queue_work(wl->hw, &wl->irq_work);
141
142	return IRQ_HANDLED;
143}
144
145static void wl1251_enable_line_irq(struct wl1251 *wl)
146{
147	return enable_irq(wl->irq);
148}
149
150static void wl1251_disable_line_irq(struct wl1251 *wl)
151{
152	return disable_irq(wl->irq);
153}
154
155static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
156{
157	struct sdio_func *func = wl_to_func(wl);
158	int ret;
159
160	if (enable) {
161		ret = pm_runtime_get_sync(&func->dev);
162		if (ret < 0) {
163			pm_runtime_put_sync(&func->dev);
164			goto out;
165		}
166
167		sdio_claim_host(func);
168		sdio_enable_func(func);
169		sdio_release_host(func);
170	} else {
171		sdio_claim_host(func);
172		sdio_disable_func(func);
173		sdio_release_host(func);
174
175		ret = pm_runtime_put_sync(&func->dev);
176		if (ret < 0)
177			goto out;
178	}
179
180out:
181	return ret;
182}
183
184static struct wl1251_if_operations wl1251_sdio_ops = {
185	.read = wl1251_sdio_read,
186	.write = wl1251_sdio_write,
187	.write_elp = wl1251_sdio_write_elp,
188	.read_elp = wl1251_sdio_read_elp,
189	.reset = wl1251_sdio_reset,
190	.power = wl1251_sdio_set_power,
191};
192
193static int wl1251_sdio_probe(struct sdio_func *func,
194			     const struct sdio_device_id *id)
195{
196	int ret;
197	struct wl1251 *wl;
198	struct ieee80211_hw *hw;
199	struct wl1251_sdio *wl_sdio;
200	const struct wl1251_platform_data *wl1251_board_data;
201	struct device_node *np = func->dev.of_node;
202
203	hw = wl1251_alloc_hw();
204	if (IS_ERR(hw))
205		return PTR_ERR(hw);
206
207	wl = hw->priv;
208
209	wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
210	if (wl_sdio == NULL) {
211		ret = -ENOMEM;
212		goto out_free_hw;
213	}
214
215	sdio_claim_host(func);
216	ret = sdio_enable_func(func);
217	if (ret)
218		goto release;
219
220	sdio_set_block_size(func, 512);
221	sdio_release_host(func);
222
223	SET_IEEE80211_DEV(hw, &func->dev);
224	wl_sdio->func = func;
225	wl->if_priv = wl_sdio;
226	wl->if_ops = &wl1251_sdio_ops;
227
228	wl1251_board_data = wl1251_get_platform_data();
229	if (!IS_ERR(wl1251_board_data)) {
230		wl->irq = wl1251_board_data->irq;
231		wl->use_eeprom = wl1251_board_data->use_eeprom;
232	} else if (np) {
233		wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
234		wl->irq = of_irq_get(np, 0);
235		if (wl->irq == -EPROBE_DEFER) {
236			ret = -EPROBE_DEFER;
237			goto disable;
238		}
239	}
240
241	if (wl->irq) {
242		irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
243		ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
244		if (ret < 0) {
245			wl1251_error("request_irq() failed: %d", ret);
246			goto disable;
247		}
248
249		irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
250
251		wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
252		wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
253
254		wl1251_info("using dedicated interrupt line");
255	} else {
256		wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
257		wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
258
259		wl1251_info("using SDIO interrupt");
260	}
261
262	ret = wl1251_init_ieee80211(wl);
263	if (ret)
264		goto out_free_irq;
265
266	sdio_set_drvdata(func, wl);
267
268	/* Tell PM core that we don't need the card to be powered now */
269	pm_runtime_put_noidle(&func->dev);
270
271	return ret;
272
273out_free_irq:
274	if (wl->irq)
275		free_irq(wl->irq, wl);
276disable:
277	sdio_claim_host(func);
278	sdio_disable_func(func);
279release:
280	sdio_release_host(func);
281	kfree(wl_sdio);
282out_free_hw:
283	wl1251_free_hw(wl);
284	return ret;
285}
286
287static void wl1251_sdio_remove(struct sdio_func *func)
288{
289	struct wl1251 *wl = sdio_get_drvdata(func);
290	struct wl1251_sdio *wl_sdio = wl->if_priv;
291
292	/* Undo decrement done above in wl1251_probe */
293	pm_runtime_get_noresume(&func->dev);
294
295	if (wl->irq)
296		free_irq(wl->irq, wl);
297	wl1251_free_hw(wl);
298	kfree(wl_sdio);
299
300	sdio_claim_host(func);
301	sdio_release_irq(func);
302	sdio_disable_func(func);
303	sdio_release_host(func);
304}
305
306static int wl1251_suspend(struct device *dev)
307{
308	/*
309	 * Tell MMC/SDIO core it's OK to power down the card
310	 * (if it isn't already), but not to remove it completely.
311	 */
312	return 0;
313}
314
315static int wl1251_resume(struct device *dev)
316{
317	return 0;
318}
319
320static const struct dev_pm_ops wl1251_sdio_pm_ops = {
321	.suspend        = wl1251_suspend,
322	.resume         = wl1251_resume,
323};
324
325static struct sdio_driver wl1251_sdio_driver = {
326	.name		= "wl1251_sdio",
327	.id_table	= wl1251_devices,
328	.probe		= wl1251_sdio_probe,
329	.remove		= wl1251_sdio_remove,
330	.drv.pm		= &wl1251_sdio_pm_ops,
331};
332
333static int __init wl1251_sdio_init(void)
334{
335	int err;
336
337	err = sdio_register_driver(&wl1251_sdio_driver);
338	if (err)
339		wl1251_error("failed to register sdio driver: %d", err);
340	return err;
341}
342
343static void __exit wl1251_sdio_exit(void)
344{
345	sdio_unregister_driver(&wl1251_sdio_driver);
346	wl1251_notice("unloaded");
347}
348
349module_init(wl1251_sdio_init);
350module_exit(wl1251_sdio_exit);
351
352MODULE_LICENSE("GPL");
353MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
354