1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * This file is part of wl1251
4 *
5 * Copyright (C) 2008 Nokia Corporation
6 */
7
8 #include <linux/err.h>
9 #include <linux/interrupt.h>
10 #include <linux/irq.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <linux/swab.h>
14 #include <linux/crc7.h>
15 #include <linux/spi/spi.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/of.h>
18 #include <linux/regulator/consumer.h>
19
20 #include "wl1251.h"
21 #include "reg.h"
22 #include "spi.h"
23
24 struct wl1251_spi {
25 struct spi_device *spi;
26 struct gpio_desc *power_gpio;
27 };
28
wl1251_irq(int irq,void * cookie)29 static irqreturn_t wl1251_irq(int irq, void *cookie)
30 {
31 struct wl1251 *wl;
32
33 wl1251_debug(DEBUG_IRQ, "IRQ");
34
35 wl = cookie;
36
37 ieee80211_queue_work(wl->hw, &wl->irq_work);
38
39 return IRQ_HANDLED;
40 }
41
wl1251_spi_reset(struct wl1251 * wl)42 static void wl1251_spi_reset(struct wl1251 *wl)
43 {
44 struct wl1251_spi *wl_spi = wl->if_priv;
45 u8 *cmd;
46 struct spi_transfer t;
47 struct spi_message m;
48
49 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
50 if (!cmd) {
51 wl1251_error("could not allocate cmd for spi reset");
52 return;
53 }
54
55 memset(&t, 0, sizeof(t));
56 spi_message_init(&m);
57
58 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
59
60 t.tx_buf = cmd;
61 t.len = WSPI_INIT_CMD_LEN;
62 spi_message_add_tail(&t, &m);
63
64 spi_sync(wl_spi->spi, &m);
65
66 wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
67
68 kfree(cmd);
69 }
70
wl1251_spi_wake(struct wl1251 * wl)71 static void wl1251_spi_wake(struct wl1251 *wl)
72 {
73 struct wl1251_spi *wl_spi = wl->if_priv;
74 struct spi_transfer t;
75 struct spi_message m;
76 u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
77
78 if (!cmd) {
79 wl1251_error("could not allocate cmd for spi init");
80 return;
81 }
82
83 memset(&t, 0, sizeof(t));
84 spi_message_init(&m);
85
86 /* Set WSPI_INIT_COMMAND
87 * the data is being send from the MSB to LSB
88 */
89 cmd[0] = 0xff;
90 cmd[1] = 0xff;
91 cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
92 cmd[3] = 0;
93 cmd[4] = 0;
94 cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
95 cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
96
97 cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
98 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
99
100 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
101 cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
102 else
103 cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
104
105 cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
106 /*
107 * The above is the logical order; it must actually be stored
108 * in the buffer byte-swapped.
109 */
110 __swab32s((u32 *)cmd);
111 __swab32s((u32 *)cmd+1);
112
113 t.tx_buf = cmd;
114 t.len = WSPI_INIT_CMD_LEN;
115 spi_message_add_tail(&t, &m);
116
117 spi_sync(wl_spi->spi, &m);
118
119 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
120
121 kfree(cmd);
122 }
123
wl1251_spi_reset_wake(struct wl1251 * wl)124 static void wl1251_spi_reset_wake(struct wl1251 *wl)
125 {
126 wl1251_spi_reset(wl);
127 wl1251_spi_wake(wl);
128 }
129
wl1251_spi_read(struct wl1251 * wl,int addr,void * buf,size_t len)130 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
131 size_t len)
132 {
133 struct wl1251_spi *wl_spi = wl->if_priv;
134 struct spi_transfer t[3];
135 struct spi_message m;
136 u8 *busy_buf;
137 u32 *cmd;
138
139 cmd = &wl->buffer_cmd;
140 busy_buf = wl->buffer_busyword;
141
142 *cmd = 0;
143 *cmd |= WSPI_CMD_READ;
144 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
145 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
146
147 spi_message_init(&m);
148 memset(t, 0, sizeof(t));
149
150 t[0].tx_buf = cmd;
151 t[0].len = 4;
152 spi_message_add_tail(&t[0], &m);
153
154 /* Busy and non busy words read */
155 t[1].rx_buf = busy_buf;
156 t[1].len = WL1251_BUSY_WORD_LEN;
157 spi_message_add_tail(&t[1], &m);
158
159 t[2].rx_buf = buf;
160 t[2].len = len;
161 spi_message_add_tail(&t[2], &m);
162
163 spi_sync(wl_spi->spi, &m);
164
165 /* FIXME: check busy words */
166
167 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
168 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
169 }
170
wl1251_spi_write(struct wl1251 * wl,int addr,void * buf,size_t len)171 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
172 size_t len)
173 {
174 struct wl1251_spi *wl_spi = wl->if_priv;
175 struct spi_transfer t[2];
176 struct spi_message m;
177 u32 *cmd;
178
179 cmd = &wl->buffer_cmd;
180
181 *cmd = 0;
182 *cmd |= WSPI_CMD_WRITE;
183 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
184 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
185
186 spi_message_init(&m);
187 memset(t, 0, sizeof(t));
188
189 t[0].tx_buf = cmd;
190 t[0].len = sizeof(*cmd);
191 spi_message_add_tail(&t[0], &m);
192
193 t[1].tx_buf = buf;
194 t[1].len = len;
195 spi_message_add_tail(&t[1], &m);
196
197 spi_sync(wl_spi->spi, &m);
198
199 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
200 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
201 }
202
wl1251_spi_enable_irq(struct wl1251 * wl)203 static void wl1251_spi_enable_irq(struct wl1251 *wl)
204 {
205 return enable_irq(wl->irq);
206 }
207
wl1251_spi_disable_irq(struct wl1251 * wl)208 static void wl1251_spi_disable_irq(struct wl1251 *wl)
209 {
210 return disable_irq(wl->irq);
211 }
212
wl1251_spi_set_power(struct wl1251 * wl,bool enable)213 static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
214 {
215 struct wl1251_spi *wl_spi = wl->if_priv;
216
217 if (wl_spi->power_gpio)
218 gpiod_set_value_cansleep(wl_spi->power_gpio, enable);
219
220 return 0;
221 }
222
223 static const struct wl1251_if_operations wl1251_spi_ops = {
224 .read = wl1251_spi_read,
225 .write = wl1251_spi_write,
226 .reset = wl1251_spi_reset_wake,
227 .enable_irq = wl1251_spi_enable_irq,
228 .disable_irq = wl1251_spi_disable_irq,
229 .power = wl1251_spi_set_power,
230 };
231
wl1251_spi_probe(struct spi_device * spi)232 static int wl1251_spi_probe(struct spi_device *spi)
233 {
234 struct device_node *np = spi->dev.of_node;
235 struct ieee80211_hw *hw;
236 struct wl1251_spi *wl_spi;
237 struct wl1251 *wl;
238 int ret;
239
240 if (!np)
241 return -ENODEV;
242
243 wl_spi = devm_kzalloc(&spi->dev, sizeof(*wl_spi), GFP_KERNEL);
244 if (!wl_spi)
245 return -ENOMEM;
246
247 wl_spi->spi = spi;
248
249 hw = wl1251_alloc_hw();
250 if (IS_ERR(hw))
251 return PTR_ERR(hw);
252
253 wl = hw->priv;
254
255 SET_IEEE80211_DEV(hw, &spi->dev);
256 spi_set_drvdata(spi, wl);
257 wl->if_priv = wl_spi;
258 wl->if_ops = &wl1251_spi_ops;
259
260 /* This is the only SPI value that we need to set here, the rest
261 * comes from the board-peripherals file
262 */
263 spi->bits_per_word = 32;
264
265 ret = spi_setup(spi);
266 if (ret < 0) {
267 wl1251_error("spi_setup failed");
268 goto out_free;
269 }
270
271 wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
272
273 wl_spi->power_gpio = devm_gpiod_get_optional(&spi->dev, "ti,power",
274 GPIOD_OUT_LOW);
275 ret = PTR_ERR_OR_ZERO(wl_spi->power_gpio);
276 if (ret) {
277 if (ret != -EPROBE_DEFER)
278 wl1251_error("Failed to request gpio: %d\n", ret);
279 goto out_free;
280 }
281
282 gpiod_set_consumer_name(wl_spi->power_gpio, "wl1251 power");
283
284 wl->irq = spi->irq;
285 if (wl->irq < 0) {
286 wl1251_error("irq missing in platform data");
287 ret = -ENODEV;
288 goto out_free;
289 }
290
291 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
292 ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
293 DRIVER_NAME, wl);
294 if (ret < 0) {
295 wl1251_error("request_irq() failed: %d", ret);
296 goto out_free;
297 }
298
299 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
300
301 wl->vio = devm_regulator_get(&spi->dev, "vio");
302 if (IS_ERR(wl->vio)) {
303 ret = PTR_ERR(wl->vio);
304 wl1251_error("vio regulator missing: %d", ret);
305 goto out_free;
306 }
307
308 ret = regulator_enable(wl->vio);
309 if (ret)
310 goto out_free;
311
312 ret = wl1251_init_ieee80211(wl);
313 if (ret)
314 goto disable_regulator;
315
316 return 0;
317
318 disable_regulator:
319 regulator_disable(wl->vio);
320 out_free:
321 ieee80211_free_hw(hw);
322
323 return ret;
324 }
325
wl1251_spi_remove(struct spi_device * spi)326 static void wl1251_spi_remove(struct spi_device *spi)
327 {
328 struct wl1251 *wl = spi_get_drvdata(spi);
329
330 wl1251_free_hw(wl);
331 regulator_disable(wl->vio);
332 }
333
334 static struct spi_driver wl1251_spi_driver = {
335 .driver = {
336 .name = DRIVER_NAME,
337 },
338
339 .probe = wl1251_spi_probe,
340 .remove = wl1251_spi_remove,
341 };
342
343 module_spi_driver(wl1251_spi_driver);
344
345 MODULE_LICENSE("GPL");
346 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
347 MODULE_ALIAS("spi:wl1251");
348