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f5fc0f86 LC |
1 | /* |
2 | * This file is part of wl1271 | |
3 | * | |
4 | * Copyright (C) 2008-2009 Nokia Corporation | |
5 | * | |
6 | * Contact: Luciano Coelho <luciano.coelho@nokia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/platform_device.h> | |
26 | #include <linux/crc7.h> | |
27 | #include <linux/spi/spi.h> | |
28 | ||
29 | #include "wl1271.h" | |
30 | #include "wl12xx_80211.h" | |
31 | #include "wl1271_spi.h" | |
32 | ||
f5fc0f86 | 33 | |
f5fc0f86 LC |
34 | void wl1271_spi_reset(struct wl1271 *wl) |
35 | { | |
36 | u8 *cmd; | |
37 | struct spi_transfer t; | |
38 | struct spi_message m; | |
39 | ||
40 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); | |
41 | if (!cmd) { | |
42 | wl1271_error("could not allocate cmd for spi reset"); | |
43 | return; | |
44 | } | |
45 | ||
46 | memset(&t, 0, sizeof(t)); | |
47 | spi_message_init(&m); | |
48 | ||
49 | memset(cmd, 0xff, WSPI_INIT_CMD_LEN); | |
50 | ||
51 | t.tx_buf = cmd; | |
52 | t.len = WSPI_INIT_CMD_LEN; | |
53 | spi_message_add_tail(&t, &m); | |
54 | ||
55 | spi_sync(wl->spi, &m); | |
56 | ||
57 | wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); | |
58 | } | |
59 | ||
60 | void wl1271_spi_init(struct wl1271 *wl) | |
61 | { | |
62 | u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; | |
63 | struct spi_transfer t; | |
64 | struct spi_message m; | |
65 | ||
66 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); | |
67 | if (!cmd) { | |
68 | wl1271_error("could not allocate cmd for spi init"); | |
69 | return; | |
70 | } | |
71 | ||
72 | memset(crc, 0, sizeof(crc)); | |
73 | memset(&t, 0, sizeof(t)); | |
74 | spi_message_init(&m); | |
75 | ||
76 | /* | |
77 | * Set WSPI_INIT_COMMAND | |
78 | * the data is being send from the MSB to LSB | |
79 | */ | |
80 | cmd[2] = 0xff; | |
81 | cmd[3] = 0xff; | |
82 | cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; | |
83 | cmd[0] = 0; | |
84 | cmd[7] = 0; | |
85 | cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; | |
86 | cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; | |
87 | ||
88 | if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) | |
89 | cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; | |
90 | else | |
91 | cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; | |
92 | ||
93 | cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS | |
94 | | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; | |
95 | ||
96 | crc[0] = cmd[1]; | |
97 | crc[1] = cmd[0]; | |
98 | crc[2] = cmd[7]; | |
99 | crc[3] = cmd[6]; | |
100 | crc[4] = cmd[5]; | |
101 | ||
102 | cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; | |
103 | cmd[4] |= WSPI_INIT_CMD_END; | |
104 | ||
105 | t.tx_buf = cmd; | |
106 | t.len = WSPI_INIT_CMD_LEN; | |
107 | spi_message_add_tail(&t, &m); | |
108 | ||
109 | spi_sync(wl->spi, &m); | |
110 | ||
111 | wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); | |
112 | } | |
113 | ||
545f1da8 JO |
114 | #define WL1271_BUSY_WORD_TIMEOUT 1000 |
115 | ||
938e30c9 LC |
116 | /* FIXME: Check busy words, removed due to SPI bug */ |
117 | #if 0 | |
118 | static void wl1271_spi_read_busy(struct wl1271 *wl, void *buf, size_t len) | |
545f1da8 JO |
119 | { |
120 | struct spi_transfer t[1]; | |
121 | struct spi_message m; | |
122 | u32 *busy_buf; | |
123 | int num_busy_bytes = 0; | |
124 | ||
125 | wl1271_info("spi read BUSY!"); | |
126 | ||
127 | /* | |
128 | * Look for the non-busy word in the read buffer, and if found, | |
129 | * read in the remaining data into the buffer. | |
130 | */ | |
131 | busy_buf = (u32 *)buf; | |
132 | for (; (u32)busy_buf < (u32)buf + len; busy_buf++) { | |
133 | num_busy_bytes += sizeof(u32); | |
134 | if (*busy_buf & 0x1) { | |
135 | spi_message_init(&m); | |
136 | memset(t, 0, sizeof(t)); | |
137 | memmove(buf, busy_buf, len - num_busy_bytes); | |
138 | t[0].rx_buf = buf + (len - num_busy_bytes); | |
139 | t[0].len = num_busy_bytes; | |
140 | spi_message_add_tail(&t[0], &m); | |
141 | spi_sync(wl->spi, &m); | |
142 | return; | |
143 | } | |
144 | } | |
145 | ||
146 | /* | |
147 | * Read further busy words from SPI until a non-busy word is | |
148 | * encountered, then read the data itself into the buffer. | |
149 | */ | |
150 | wl1271_info("spi read BUSY-polling needed!"); | |
151 | ||
152 | num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; | |
153 | busy_buf = wl->buffer_busyword; | |
154 | while (num_busy_bytes) { | |
155 | num_busy_bytes--; | |
156 | spi_message_init(&m); | |
157 | memset(t, 0, sizeof(t)); | |
158 | t[0].rx_buf = busy_buf; | |
159 | t[0].len = sizeof(u32); | |
160 | spi_message_add_tail(&t[0], &m); | |
161 | spi_sync(wl->spi, &m); | |
162 | ||
163 | if (*busy_buf & 0x1) { | |
164 | spi_message_init(&m); | |
165 | memset(t, 0, sizeof(t)); | |
166 | t[0].rx_buf = buf; | |
167 | t[0].len = len; | |
168 | spi_message_add_tail(&t[0], &m); | |
169 | spi_sync(wl->spi, &m); | |
170 | return; | |
171 | } | |
172 | } | |
173 | ||
174 | /* The SPI bus is unresponsive, the read failed. */ | |
175 | memset(buf, 0, len); | |
176 | wl1271_error("SPI read busy-word timeout!\n"); | |
177 | } | |
938e30c9 | 178 | #endif |
545f1da8 | 179 | |
74621417 JO |
180 | void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf, |
181 | size_t len, bool fixed) | |
f5fc0f86 LC |
182 | { |
183 | struct spi_transfer t[3]; | |
184 | struct spi_message m; | |
545f1da8 | 185 | u32 *busy_buf; |
f5fc0f86 LC |
186 | u32 *cmd; |
187 | ||
188 | cmd = &wl->buffer_cmd; | |
189 | busy_buf = wl->buffer_busyword; | |
190 | ||
191 | *cmd = 0; | |
192 | *cmd |= WSPI_CMD_READ; | |
193 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; | |
194 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; | |
195 | ||
196 | if (fixed) | |
197 | *cmd |= WSPI_CMD_FIXED; | |
198 | ||
199 | spi_message_init(&m); | |
200 | memset(t, 0, sizeof(t)); | |
201 | ||
202 | t[0].tx_buf = cmd; | |
203 | t[0].len = 4; | |
204 | spi_message_add_tail(&t[0], &m); | |
205 | ||
206 | /* Busy and non busy words read */ | |
207 | t[1].rx_buf = busy_buf; | |
208 | t[1].len = WL1271_BUSY_WORD_LEN; | |
209 | spi_message_add_tail(&t[1], &m); | |
210 | ||
211 | t[2].rx_buf = buf; | |
212 | t[2].len = len; | |
213 | spi_message_add_tail(&t[2], &m); | |
214 | ||
215 | spi_sync(wl->spi, &m); | |
216 | ||
c6d5d06e JO |
217 | /* FIXME: Check busy words, removed due to SPI bug */ |
218 | /* if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1)) | |
219 | wl1271_spi_read_busy(wl, buf, len); */ | |
f5fc0f86 LC |
220 | |
221 | wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); | |
222 | wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); | |
223 | } | |
224 | ||
74621417 JO |
225 | void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf, |
226 | size_t len, bool fixed) | |
f5fc0f86 LC |
227 | { |
228 | struct spi_transfer t[2]; | |
229 | struct spi_message m; | |
230 | u32 *cmd; | |
231 | ||
232 | cmd = &wl->buffer_cmd; | |
233 | ||
234 | *cmd = 0; | |
235 | *cmd |= WSPI_CMD_WRITE; | |
236 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; | |
237 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; | |
238 | ||
239 | if (fixed) | |
240 | *cmd |= WSPI_CMD_FIXED; | |
241 | ||
242 | spi_message_init(&m); | |
243 | memset(t, 0, sizeof(t)); | |
244 | ||
245 | t[0].tx_buf = cmd; | |
246 | t[0].len = sizeof(*cmd); | |
247 | spi_message_add_tail(&t[0], &m); | |
248 | ||
249 | t[1].tx_buf = buf; | |
250 | t[1].len = len; | |
251 | spi_message_add_tail(&t[1], &m); | |
252 | ||
253 | spi_sync(wl->spi, &m); | |
254 | ||
255 | wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); | |
256 | wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); | |
257 | } |