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/irq.h>
16#include <linux/pm_runtime.h>
17#include <linux/of.h>
18#include <linux/of_irq.h>
19
20#include "wl1251.h"
21
22struct wl1251_sdio {
23	struct sdio_func *func;
24	u32 elp_val;
25};
26
27static struct sdio_func *wl_to_func(struct wl1251 *wl)
28{
29	struct wl1251_sdio *wl_sdio = wl->if_priv;
30	return wl_sdio->func;
31}
32
33static void wl1251_sdio_interrupt(struct sdio_func *func)
34{
35	struct wl1251 *wl = sdio_get_drvdata(func);
36
37	wl1251_debug(DEBUG_IRQ, "IRQ");
38
39	/* FIXME should be synchronous for sdio */
40	ieee80211_queue_work(wl->hw, &wl->irq_work);
41}
42
43static const struct sdio_device_id wl1251_devices[] = {
44	{ SDIO_DEVICE(SDIO_VENDOR_ID_TI_WL1251, SDIO_DEVICE_ID_TI_WL1251) },
45	{}
46};
47MODULE_DEVICE_TABLE(sdio, wl1251_devices);
48
49
50static void wl1251_sdio_read(struct wl1251 *wl, int addr,
51			     void *buf, size_t len)
52{
53	int ret;
54	struct sdio_func *func = wl_to_func(wl);
55
56	sdio_claim_host(func);
57	ret = sdio_memcpy_fromio(func, buf, addr, len);
58	if (ret)
59		wl1251_error("sdio read failed (%d)", ret);
60	sdio_release_host(func);
61}
62
63static void wl1251_sdio_write(struct wl1251 *wl, int addr,
64			      void *buf, size_t len)
65{
66	int ret;
67	struct sdio_func *func = wl_to_func(wl);
68
69	sdio_claim_host(func);
70	ret = sdio_memcpy_toio(func, addr, buf, len);
71	if (ret)
72		wl1251_error("sdio write failed (%d)", ret);
73	sdio_release_host(func);
74}
75
76static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val)
77{
78	int ret = 0;
79	struct wl1251_sdio *wl_sdio = wl->if_priv;
80	struct sdio_func *func = wl_sdio->func;
81
82	/*
83	 * The hardware only supports RAW (read after write) access for
84	 * reading, regular sdio_readb won't work here (it interprets
85	 * the unused bits of CMD52 as write data even if we send read
86	 * request).
87	 */
88	sdio_claim_host(func);
89	*val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret);
90	sdio_release_host(func);
91
92	if (ret)
93		wl1251_error("sdio_readb failed (%d)", ret);
94}
95
96static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val)
97{
98	int ret = 0;
99	struct wl1251_sdio *wl_sdio = wl->if_priv;
100	struct sdio_func *func = wl_sdio->func;
101
102	sdio_claim_host(func);
103	sdio_writeb(func, val, addr, &ret);
104	sdio_release_host(func);
105
106	if (ret)
107		wl1251_error("sdio_writeb failed (%d)", ret);
108	else
109		wl_sdio->elp_val = val;
110}
111
112static void wl1251_sdio_reset(struct wl1251 *wl)
113{
114}
115
116static void wl1251_sdio_enable_irq(struct wl1251 *wl)
117{
118	struct sdio_func *func = wl_to_func(wl);
119
120	sdio_claim_host(func);
121	sdio_claim_irq(func, wl1251_sdio_interrupt);
122	sdio_release_host(func);
123}
124
125static void wl1251_sdio_disable_irq(struct wl1251 *wl)
126{
127	struct sdio_func *func = wl_to_func(wl);
128
129	sdio_claim_host(func);
130	sdio_release_irq(func);
131	sdio_release_host(func);
132}
133
134/* Interrupts when using dedicated WLAN_IRQ pin */
135static irqreturn_t wl1251_line_irq(int irq, void *cookie)
136{
137	struct wl1251 *wl = cookie;
138
139	ieee80211_queue_work(wl->hw, &wl->irq_work);
140
141	return IRQ_HANDLED;
142}
143
144static void wl1251_enable_line_irq(struct wl1251 *wl)
145{
146	return enable_irq(wl->irq);
147}
148
149static void wl1251_disable_line_irq(struct wl1251 *wl)
150{
151	return disable_irq(wl->irq);
152}
153
154static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable)
155{
156	struct sdio_func *func = wl_to_func(wl);
157	int ret;
158
159	if (enable) {
160		ret = pm_runtime_get_sync(&func->dev);
161		if (ret < 0) {
162			pm_runtime_put_sync(&func->dev);
163			goto out;
164		}
165
166		sdio_claim_host(func);
167		sdio_enable_func(func);
168		sdio_release_host(func);
169	} else {
170		sdio_claim_host(func);
171		sdio_disable_func(func);
172		sdio_release_host(func);
173
174		ret = pm_runtime_put_sync(&func->dev);
175		if (ret < 0)
176			goto out;
177	}
178
179out:
180	return ret;
181}
182
183static struct wl1251_if_operations wl1251_sdio_ops = {
184	.read = wl1251_sdio_read,
185	.write = wl1251_sdio_write,
186	.write_elp = wl1251_sdio_write_elp,
187	.read_elp = wl1251_sdio_read_elp,
188	.reset = wl1251_sdio_reset,
189	.power = wl1251_sdio_set_power,
190};
191
192static int wl1251_sdio_probe(struct sdio_func *func,
193			     const struct sdio_device_id *id)
194{
195	int ret;
196	struct wl1251 *wl;
197	struct ieee80211_hw *hw;
198	struct wl1251_sdio *wl_sdio;
199	struct device_node *np = func->dev.of_node;
200
201	hw = wl1251_alloc_hw();
202	if (IS_ERR(hw))
203		return PTR_ERR(hw);
204
205	wl = hw->priv;
206
207	wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL);
208	if (wl_sdio == NULL) {
209		ret = -ENOMEM;
210		goto out_free_hw;
211	}
212
213	sdio_claim_host(func);
214	ret = sdio_enable_func(func);
215	if (ret)
216		goto release;
217
218	sdio_set_block_size(func, 512);
219	sdio_release_host(func);
220
221	SET_IEEE80211_DEV(hw, &func->dev);
222	wl_sdio->func = func;
223	wl->if_priv = wl_sdio;
224	wl->if_ops = &wl1251_sdio_ops;
225
226	if (np) {
227		wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
228		wl->irq = of_irq_get(np, 0);
229		if (wl->irq == -EPROBE_DEFER) {
230			ret = -EPROBE_DEFER;
231			goto disable;
232		}
233	}
234
235	if (wl->irq) {
236		irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
237		ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl);
238		if (ret < 0) {
239			wl1251_error("request_irq() failed: %d", ret);
240			goto disable;
241		}
242
243		irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
244
245		wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq;
246		wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq;
247
248		wl1251_info("using dedicated interrupt line");
249	} else {
250		wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq;
251		wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq;
252
253		wl1251_info("using SDIO interrupt");
254	}
255
256	ret = wl1251_init_ieee80211(wl);
257	if (ret)
258		goto out_free_irq;
259
260	sdio_set_drvdata(func, wl);
261
262	/* Tell PM core that we don't need the card to be powered now */
263	pm_runtime_put_noidle(&func->dev);
264
265	return ret;
266
267out_free_irq:
268	if (wl->irq)
269		free_irq(wl->irq, wl);
270disable:
271	sdio_claim_host(func);
272	sdio_disable_func(func);
273release:
274	sdio_release_host(func);
275	kfree(wl_sdio);
276out_free_hw:
277	wl1251_free_hw(wl);
278	return ret;
279}
280
281static void wl1251_sdio_remove(struct sdio_func *func)
282{
283	struct wl1251 *wl = sdio_get_drvdata(func);
284	struct wl1251_sdio *wl_sdio = wl->if_priv;
285
286	/* Undo decrement done above in wl1251_probe */
287	pm_runtime_get_noresume(&func->dev);
288
289	if (wl->irq)
290		free_irq(wl->irq, wl);
291	wl1251_free_hw(wl);
292	kfree(wl_sdio);
293
294	sdio_claim_host(func);
295	sdio_release_irq(func);
296	sdio_disable_func(func);
297	sdio_release_host(func);
298}
299
300static int wl1251_suspend(struct device *dev)
301{
302	/*
303	 * Tell MMC/SDIO core it's OK to power down the card
304	 * (if it isn't already), but not to remove it completely.
305	 */
306	return 0;
307}
308
309static int wl1251_resume(struct device *dev)
310{
311	return 0;
312}
313
314static const struct dev_pm_ops wl1251_sdio_pm_ops = {
315	.suspend        = wl1251_suspend,
316	.resume         = wl1251_resume,
317};
318
319static struct sdio_driver wl1251_sdio_driver = {
320	.name		= "wl1251_sdio",
321	.id_table	= wl1251_devices,
322	.probe		= wl1251_sdio_probe,
323	.remove		= wl1251_sdio_remove,
324	.drv.pm		= &wl1251_sdio_pm_ops,
325};
326
327static int __init wl1251_sdio_init(void)
328{
329	int err;
330
331	err = sdio_register_driver(&wl1251_sdio_driver);
332	if (err)
333		wl1251_error("failed to register sdio driver: %d", err);
334	return err;
335}
336
337static void __exit wl1251_sdio_exit(void)
338{
339	sdio_unregister_driver(&wl1251_sdio_driver);
340	wl1251_notice("unloaded");
341}
342
343module_init(wl1251_sdio_init);
344module_exit(wl1251_sdio_exit);
345
346MODULE_DESCRIPTION("TI WL1251 SDIO helpers");
347MODULE_LICENSE("GPL");
348MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
349