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(hw: wl->hw, work: &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, dst: buf, addr, count: 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, src: buf, count: 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, write_byte: wl_sdio->elp_val, addr, err_ret: &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, b: val, addr, err_ret: &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, handler: 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(hw: wl->hw, work: &wl->irq_work);
140
141 return IRQ_HANDLED;
142}
143
144static void wl1251_enable_line_irq(struct wl1251 *wl)
145{
146 return enable_irq(irq: wl->irq);
147}
148
149static void wl1251_disable_line_irq(struct wl1251 *wl)
150{
151 return disable_irq(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(dev: &func->dev);
161 if (ret < 0) {
162 pm_runtime_put_sync(dev: &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(dev: &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(ptr: hw))
203 return PTR_ERR(ptr: hw);
204
205 wl = hw->priv;
206
207 wl_sdio = kzalloc(size: 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, blksz: 512);
219 sdio_release_host(func);
220
221 SET_IEEE80211_DEV(hw, dev: &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, propname: "ti,wl1251-has-eeprom");
228 wl->irq = of_irq_get(dev: np, index: 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(irq: wl->irq, set: IRQ_NOAUTOEN);
237 ret = request_irq(irq: wl->irq, handler: wl1251_line_irq, flags: 0, name: "wl1251", dev: wl);
238 if (ret < 0) {
239 wl1251_error("request_irq() failed: %d", ret);
240 goto disable;
241 }
242
243 irq_set_irq_type(irq: wl->irq, type: 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(dev: &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(objp: 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(dev: &func->dev);
288
289 if (wl->irq)
290 free_irq(wl->irq, wl);
291 wl1251_free_hw(wl);
292 kfree(objp: 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

source code of linux/drivers/net/wireless/ti/wl1251/sdio.c