summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/wl12xx/spi.c
blob: abdf171a47e738613fc1779bae3a512d60c7f415 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
/*
 * This file is part of wl12xx
 *
 * Copyright (C) 2008 Nokia Corporation
 *
 * Contact: Kalle Valo <kalle.valo@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/crc7.h>
#include <linux/spi/spi.h>

#include "wl12xx.h"
#include "wl12xx_80211.h"
#include "reg.h"
#include "spi.h"
#include "ps.h"

static int wl12xx_translate_reg_addr(struct wl12xx *wl, int addr)
{
	/* If the address is lower than REGISTERS_BASE, it means that this is
	 * a chip-specific register address, so look it up in the registers
	 * table */
	if (addr < REGISTERS_BASE) {
		/* Make sure we don't go over the table */
		if (addr >= ACX_REG_TABLE_LEN) {
			wl12xx_error("address out of range (%d)", addr);
			return -EINVAL;
		}
		addr = wl->chip.acx_reg_table[addr];
	}

	return addr - wl->physical_reg_addr + wl->virtual_reg_addr;
}

static int wl12xx_translate_mem_addr(struct wl12xx *wl, int addr)
{
	return addr - wl->physical_mem_addr + wl->virtual_mem_addr;
}


void wl12xx_spi_reset(struct wl12xx *wl)
{
	u8 *cmd;
	struct spi_transfer t;
	struct spi_message m;

	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	if (!cmd) {
		wl12xx_error("could not allocate cmd for spi reset");
		return;
	}

	memset(&t, 0, sizeof(t));
	spi_message_init(&m);

	memset(cmd, 0xff, WSPI_INIT_CMD_LEN);

	t.tx_buf = cmd;
	t.len = WSPI_INIT_CMD_LEN;
	spi_message_add_tail(&t, &m);

	spi_sync(wl->spi, &m);

	wl12xx_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
}

void wl12xx_spi_init(struct wl12xx *wl)
{
	u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
	struct spi_transfer t;
	struct spi_message m;

	cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
	if (!cmd) {
		wl12xx_error("could not allocate cmd for spi init");
		return;
	}

	memset(crc, 0, sizeof(crc));
	memset(&t, 0, sizeof(t));
	spi_message_init(&m);

	/*
	 * Set WSPI_INIT_COMMAND
	 * the data is being send from the MSB to LSB
	 */
	cmd[2] = 0xff;
	cmd[3] = 0xff;
	cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
	cmd[0] = 0;
	cmd[7] = 0;
	cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
	cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;

	if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
		cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;
	else
		cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;

	cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
		| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;

	crc[0] = cmd[1];
	crc[1] = cmd[0];
	crc[2] = cmd[7];
	crc[3] = cmd[6];
	crc[4] = cmd[5];

	cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
	cmd[4] |= WSPI_INIT_CMD_END;

	t.tx_buf = cmd;
	t.len = WSPI_INIT_CMD_LEN;
	spi_message_add_tail(&t, &m);

	spi_sync(wl->spi, &m);

	wl12xx_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
}

/* Set the SPI partitions to access the chip addresses
 *
 * There are two VIRTUAL (SPI) partitions (the memory partition and the
 * registers partition), which are mapped to two different areas of the
 * PHYSICAL (hardware) memory.  This function also makes other checks to
 * ensure that the partitions are not overlapping.  In the diagram below, the
 * memory partition comes before the register partition, but the opposite is
 * also supported.
 *
 *                               PHYSICAL address
 *                                     space
 *
 *                                    |    |
 *                                 ...+----+--> mem_start
 *          VIRTUAL address     ...   |    |
 *               space       ...      |    | [PART_0]
 *                        ...         |    |
 * 0x00000000 <--+----+...         ...+----+--> mem_start + mem_size
 *               |    |         ...   |    |
 *               |MEM |      ...      |    |
 *               |    |   ...         |    |
 *  part_size <--+----+...            |    | {unused area)
 *               |    |   ...         |    |
 *               |REG |      ...      |    |
 *  part_size    |    |         ...   |    |
 *      +     <--+----+...         ...+----+--> reg_start
 *  reg_size              ...         |    |
 *                           ...      |    | [PART_1]
 *                              ...   |    |
 *                                 ...+----+--> reg_start + reg_size
 *                                    |    |
 *
 */
void wl12xx_set_partition(struct wl12xx *wl,
			  u32 mem_start, u32 mem_size,
			  u32 reg_start, u32 reg_size)
{
	u8 tx_buf[sizeof(u32) + 2 * sizeof(struct wl12xx_partition)];
	struct wl12xx_partition *partition;
	struct spi_transfer t;
	struct spi_message m;
	u32 *cmd;
	size_t len;
	int addr;

	spi_message_init(&m);
	memset(&t, 0, sizeof(t));
	memset(tx_buf, 0, sizeof(tx_buf));

	cmd = (u32 *) tx_buf;
	partition = (struct wl12xx_partition *) (tx_buf + sizeof(u32));
	addr = HW_ACCESS_PART0_SIZE_ADDR;
	len = 2 * sizeof(struct wl12xx_partition);

	*cmd |= WSPI_CMD_WRITE;
	*cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	*cmd |= addr & WSPI_CMD_BYTE_ADDR;

	wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
		     mem_start, mem_size);
	wl12xx_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
		     reg_start, reg_size);

	/* Make sure that the two partitions together don't exceed the
	 * address range */
	if ((mem_size + reg_size) > HW_ACCESS_MEMORY_MAX_RANGE) {
		wl12xx_debug(DEBUG_SPI, "Total size exceeds maximum virtual"
			     " address range.  Truncating partition[0].");
		mem_size = HW_ACCESS_MEMORY_MAX_RANGE - reg_size;
		wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
			     mem_start, mem_size);
		wl12xx_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
			     reg_start, reg_size);
	}

	if ((mem_start < reg_start) &&
	    ((mem_start + mem_size) > reg_start)) {
		/* Guarantee that the memory partition doesn't overlap the
		 * registers partition */
		wl12xx_debug(DEBUG_SPI, "End of partition[0] is "
			     "overlapping partition[1].  Adjusted.");
		mem_size = reg_start - mem_start;
		wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
			     mem_start, mem_size);
		wl12xx_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
			     reg_start, reg_size);
	} else if ((reg_start < mem_start) &&
		   ((reg_start + reg_size) > mem_start)) {
		/* Guarantee that the register partition doesn't overlap the
		 * memory partition */
		wl12xx_debug(DEBUG_SPI, "End of partition[1] is"
			     " overlapping partition[0].  Adjusted.");
		reg_size = mem_start - reg_start;
		wl12xx_debug(DEBUG_SPI, "mem_start %08X mem_size %08X",
			     mem_start, mem_size);
		wl12xx_debug(DEBUG_SPI, "reg_start %08X reg_size %08X",
			     reg_start, reg_size);
	}

	partition[0].start = mem_start;
	partition[0].size  = mem_size;
	partition[1].start = reg_start;
	partition[1].size  = reg_size;

	wl->physical_mem_addr = mem_start;
	wl->physical_reg_addr = reg_start;

	wl->virtual_mem_addr = 0;
	wl->virtual_reg_addr = mem_size;

	t.tx_buf = tx_buf;
	t.len = sizeof(tx_buf);
	spi_message_add_tail(&t, &m);

	spi_sync(wl->spi, &m);
}

void wl12xx_spi_read(struct wl12xx *wl, int addr, void *buf,
		     size_t len)
{
	struct spi_transfer t[3];
	struct spi_message m;
	char busy_buf[TNETWIF_READ_OFFSET_BYTES];
	u32 cmd;

	cmd = 0;
	cmd |= WSPI_CMD_READ;
	cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	cmd |= addr & WSPI_CMD_BYTE_ADDR;

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = &cmd;
	t[0].len = 4;
	spi_message_add_tail(&t[0], &m);

	/* Busy and non busy words read */
	t[1].rx_buf = busy_buf;
	t[1].len = TNETWIF_READ_OFFSET_BYTES;
	spi_message_add_tail(&t[1], &m);

	t[2].rx_buf = buf;
	t[2].len = len;
	spi_message_add_tail(&t[2], &m);

	spi_sync(wl->spi, &m);

	/* FIXME: check busy words */

	wl12xx_dump(DEBUG_SPI, "spi_read cmd -> ", &cmd, sizeof(cmd));
	wl12xx_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
}

void wl12xx_spi_write(struct wl12xx *wl, int addr, void *buf,
		      size_t len)
{
	struct spi_transfer t[2];
	struct spi_message m;
	u32 cmd;

	cmd = 0;
	cmd |= WSPI_CMD_WRITE;
	cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
	cmd |= addr & WSPI_CMD_BYTE_ADDR;

	spi_message_init(&m);
	memset(t, 0, sizeof(t));

	t[0].tx_buf = &cmd;
	t[0].len = sizeof(cmd);
	spi_message_add_tail(&t[0], &m);

	t[1].tx_buf = buf;
	t[1].len = len;
	spi_message_add_tail(&t[1], &m);

	spi_sync(wl->spi, &m);

	wl12xx_dump(DEBUG_SPI, "spi_write cmd -> ", &cmd, sizeof(cmd));
	wl12xx_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
}

void wl12xx_spi_mem_read(struct wl12xx *wl, int addr, void *buf,
			 size_t len)
{
	int physical;

	physical = wl12xx_translate_mem_addr(wl, addr);

	wl12xx_spi_read(wl, physical, buf, len);
}

void wl12xx_spi_mem_write(struct wl12xx *wl, int addr, void *buf,
			  size_t len)
{
	int physical;

	physical = wl12xx_translate_mem_addr(wl, addr);

	wl12xx_spi_write(wl, physical, buf, len);
}

u32 wl12xx_mem_read32(struct wl12xx *wl, int addr)
{
	return wl12xx_read32(wl, wl12xx_translate_mem_addr(wl, addr));
}

void wl12xx_mem_write32(struct wl12xx *wl, int addr, u32 val)
{
	wl12xx_write32(wl, wl12xx_translate_mem_addr(wl, addr), val);
}

u32 wl12xx_reg_read32(struct wl12xx *wl, int addr)
{
	return wl12xx_read32(wl, wl12xx_translate_reg_addr(wl, addr));
}

void wl12xx_reg_write32(struct wl12xx *wl, int addr, u32 val)
{
	wl12xx_write32(wl, wl12xx_translate_reg_addr(wl, addr), val);
}