1/*
2 * This file is part of wl1251
3 *
4 * Copyright (C) 2008 Nokia Corporation
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22#include <linux/interrupt.h>
23#include <linux/irq.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26#include <linux/swab.h>
27#include <linux/crc7.h>
28#include <linux/spi/spi.h>
29#include <linux/wl12xx.h>
30#include <linux/gpio.h>
31#include <linux/of.h>
32#include <linux/of_gpio.h>
33#include <linux/regulator/consumer.h>
34
35#include "wl1251.h"
36#include "reg.h"
37#include "spi.h"
38
39static irqreturn_t wl1251_irq(int irq, void *cookie)
40{
41	struct wl1251 *wl;
42
43	wl1251_debug(DEBUG_IRQ, "IRQ");
44
45	wl = cookie;
46
47	ieee80211_queue_work(wl->hw, &wl->irq_work);
48
49	return IRQ_HANDLED;
50}
51
52static struct spi_device *wl_to_spi(struct wl1251 *wl)
53{
54	return wl->if_priv;
55}
56
57static void wl1251_spi_reset(struct wl1251 *wl)
58{
59	u8 *cmd;
60	struct spi_transfer t;
61	struct spi_message m;
62
63	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
64	if (!cmd) {
65		wl1251_error("could not allocate cmd for spi reset");
66		return;
67	}
68
69	memset(&t, 0, sizeof(t));
70	spi_message_init(&m);
71
72	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
73
74	t.tx_buf = cmd;
75	t.len = WSPI_INIT_CMD_LEN;
76	spi_message_add_tail(&t, &m);
77
78	spi_sync(wl_to_spi(wl), &m);
79
80	wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
81
82	kfree(cmd);
83}
84
85static void wl1251_spi_wake(struct wl1251 *wl)
86{
87	struct spi_transfer t;
88	struct spi_message m;
89	u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
90
91	if (!cmd) {
92		wl1251_error("could not allocate cmd for spi init");
93		return;
94	}
95
96	memset(&t, 0, sizeof(t));
97	spi_message_init(&m);
98
99	/* Set WSPI_INIT_COMMAND
100	 * the data is being send from the MSB to LSB
101	 */
102	cmd[0] = 0xff;
103	cmd[1] = 0xff;
104	cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
105	cmd[3] = 0;
106	cmd[4] = 0;
107	cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
108	cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
109
110	cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
111		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
112
113	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
114		cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
115	else
116		cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
117
118	cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
119	/*
120	 * The above is the logical order; it must actually be stored
121	 * in the buffer byte-swapped.
122	 */
123	__swab32s((u32 *)cmd);
124	__swab32s((u32 *)cmd+1);
125
126	t.tx_buf = cmd;
127	t.len = WSPI_INIT_CMD_LEN;
128	spi_message_add_tail(&t, &m);
129
130	spi_sync(wl_to_spi(wl), &m);
131
132	wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
133
134	kfree(cmd);
135}
136
137static void wl1251_spi_reset_wake(struct wl1251 *wl)
138{
139	wl1251_spi_reset(wl);
140	wl1251_spi_wake(wl);
141}
142
143static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
144			    size_t len)
145{
146	struct spi_transfer t[3];
147	struct spi_message m;
148	u8 *busy_buf;
149	u32 *cmd;
150
151	cmd = &wl->buffer_cmd;
152	busy_buf = wl->buffer_busyword;
153
154	*cmd = 0;
155	*cmd |= WSPI_CMD_READ;
156	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
157	*cmd |= addr & WSPI_CMD_BYTE_ADDR;
158
159	spi_message_init(&m);
160	memset(t, 0, sizeof(t));
161
162	t[0].tx_buf = cmd;
163	t[0].len = 4;
164	spi_message_add_tail(&t[0], &m);
165
166	/* Busy and non busy words read */
167	t[1].rx_buf = busy_buf;
168	t[1].len = WL1251_BUSY_WORD_LEN;
169	spi_message_add_tail(&t[1], &m);
170
171	t[2].rx_buf = buf;
172	t[2].len = len;
173	spi_message_add_tail(&t[2], &m);
174
175	spi_sync(wl_to_spi(wl), &m);
176
177	/* FIXME: check busy words */
178
179	wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
180	wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
181}
182
183static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
184			     size_t len)
185{
186	struct spi_transfer t[2];
187	struct spi_message m;
188	u32 *cmd;
189
190	cmd = &wl->buffer_cmd;
191
192	*cmd = 0;
193	*cmd |= WSPI_CMD_WRITE;
194	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
195	*cmd |= addr & WSPI_CMD_BYTE_ADDR;
196
197	spi_message_init(&m);
198	memset(t, 0, sizeof(t));
199
200	t[0].tx_buf = cmd;
201	t[0].len = sizeof(*cmd);
202	spi_message_add_tail(&t[0], &m);
203
204	t[1].tx_buf = buf;
205	t[1].len = len;
206	spi_message_add_tail(&t[1], &m);
207
208	spi_sync(wl_to_spi(wl), &m);
209
210	wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
211	wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
212}
213
214static void wl1251_spi_enable_irq(struct wl1251 *wl)
215{
216	return enable_irq(wl->irq);
217}
218
219static void wl1251_spi_disable_irq(struct wl1251 *wl)
220{
221	return disable_irq(wl->irq);
222}
223
224static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
225{
226	if (gpio_is_valid(wl->power_gpio))
227		gpio_set_value(wl->power_gpio, enable);
228
229	return 0;
230}
231
232static const struct wl1251_if_operations wl1251_spi_ops = {
233	.read = wl1251_spi_read,
234	.write = wl1251_spi_write,
235	.reset = wl1251_spi_reset_wake,
236	.enable_irq = wl1251_spi_enable_irq,
237	.disable_irq = wl1251_spi_disable_irq,
238	.power = wl1251_spi_set_power,
239};
240
241static int wl1251_spi_probe(struct spi_device *spi)
242{
243	struct wl1251_platform_data *pdata = dev_get_platdata(&spi->dev);
244	struct device_node *np = spi->dev.of_node;
245	struct ieee80211_hw *hw;
246	struct wl1251 *wl;
247	int ret;
248
249	if (!np && !pdata) {
250		wl1251_error("no platform data");
251		return -ENODEV;
252	}
253
254	hw = wl1251_alloc_hw();
255	if (IS_ERR(hw))
256		return PTR_ERR(hw);
257
258	wl = hw->priv;
259
260	SET_IEEE80211_DEV(hw, &spi->dev);
261	spi_set_drvdata(spi, wl);
262	wl->if_priv = spi;
263	wl->if_ops = &wl1251_spi_ops;
264
265	/* This is the only SPI value that we need to set here, the rest
266	 * comes from the board-peripherals file
267	 */
268	spi->bits_per_word = 32;
269
270	ret = spi_setup(spi);
271	if (ret < 0) {
272		wl1251_error("spi_setup failed");
273		goto out_free;
274	}
275
276	if (np) {
277		wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
278		wl->power_gpio = of_get_named_gpio(np, "ti,power-gpio", 0);
279	} else if (pdata) {
280		wl->power_gpio = pdata->power_gpio;
281		wl->use_eeprom = pdata->use_eeprom;
282	}
283
284	if (wl->power_gpio == -EPROBE_DEFER) {
285		ret = -EPROBE_DEFER;
286		goto out_free;
287	}
288
289	if (gpio_is_valid(wl->power_gpio)) {
290		ret = devm_gpio_request_one(&spi->dev, wl->power_gpio,
291					GPIOF_OUT_INIT_LOW, "wl1251 power");
292		if (ret) {
293			wl1251_error("Failed to request gpio: %d\n", ret);
294			goto out_free;
295		}
296	} else {
297		wl1251_error("set power gpio missing in platform data");
298		ret = -ENODEV;
299		goto out_free;
300	}
301
302	wl->irq = spi->irq;
303	if (wl->irq < 0) {
304		wl1251_error("irq missing in platform data");
305		ret = -ENODEV;
306		goto out_free;
307	}
308
309	irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
310	ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
311							DRIVER_NAME, wl);
312	if (ret < 0) {
313		wl1251_error("request_irq() failed: %d", ret);
314		goto out_free;
315	}
316
317	irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
318
319	wl->vio = devm_regulator_get(&spi->dev, "vio");
320	if (IS_ERR(wl->vio)) {
321		ret = PTR_ERR(wl->vio);
322		wl1251_error("vio regulator missing: %d", ret);
323		goto out_free;
324	}
325
326	ret = regulator_enable(wl->vio);
327	if (ret)
328		goto out_free;
329
330	ret = wl1251_init_ieee80211(wl);
331	if (ret)
332		goto disable_regulator;
333
334	return 0;
335
336disable_regulator:
337	regulator_disable(wl->vio);
338out_free:
339	ieee80211_free_hw(hw);
340
341	return ret;
342}
343
344static int wl1251_spi_remove(struct spi_device *spi)
345{
346	struct wl1251 *wl = spi_get_drvdata(spi);
347
348	wl1251_free_hw(wl);
349	regulator_disable(wl->vio);
350
351	return 0;
352}
353
354static struct spi_driver wl1251_spi_driver = {
355	.driver = {
356		.name		= DRIVER_NAME,
357		.owner		= THIS_MODULE,
358	},
359
360	.probe		= wl1251_spi_probe,
361	.remove		= wl1251_spi_remove,
362};
363
364module_spi_driver(wl1251_spi_driver);
365
366MODULE_LICENSE("GPL");
367MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
368MODULE_ALIAS("spi:wl1251");
369