Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 28 | #include <linux/slab.h> |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 29 | |
| 30 | #include "wl1271.h" |
| 31 | #include "wl12xx_80211.h" |
| 32 | #include "wl1271_spi.h" |
| 33 | |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 34 | |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 35 | void wl1271_spi_reset(struct wl1271 *wl) |
| 36 | { |
| 37 | u8 *cmd; |
| 38 | struct spi_transfer t; |
| 39 | struct spi_message m; |
| 40 | |
| 41 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); |
| 42 | if (!cmd) { |
| 43 | wl1271_error("could not allocate cmd for spi reset"); |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | memset(&t, 0, sizeof(t)); |
| 48 | spi_message_init(&m); |
| 49 | |
| 50 | memset(cmd, 0xff, WSPI_INIT_CMD_LEN); |
| 51 | |
| 52 | t.tx_buf = cmd; |
| 53 | t.len = WSPI_INIT_CMD_LEN; |
| 54 | spi_message_add_tail(&t, &m); |
| 55 | |
| 56 | spi_sync(wl->spi, &m); |
| 57 | |
| 58 | wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); |
| 59 | } |
| 60 | |
| 61 | void wl1271_spi_init(struct wl1271 *wl) |
| 62 | { |
| 63 | u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; |
| 64 | struct spi_transfer t; |
| 65 | struct spi_message m; |
| 66 | |
| 67 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); |
| 68 | if (!cmd) { |
| 69 | wl1271_error("could not allocate cmd for spi init"); |
| 70 | return; |
| 71 | } |
| 72 | |
| 73 | memset(crc, 0, sizeof(crc)); |
| 74 | memset(&t, 0, sizeof(t)); |
| 75 | spi_message_init(&m); |
| 76 | |
| 77 | /* |
| 78 | * Set WSPI_INIT_COMMAND |
| 79 | * the data is being send from the MSB to LSB |
| 80 | */ |
| 81 | cmd[2] = 0xff; |
| 82 | cmd[3] = 0xff; |
| 83 | cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; |
| 84 | cmd[0] = 0; |
| 85 | cmd[7] = 0; |
| 86 | cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; |
| 87 | cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; |
| 88 | |
| 89 | if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) |
| 90 | cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; |
| 91 | else |
| 92 | cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; |
| 93 | |
| 94 | cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS |
| 95 | | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; |
| 96 | |
| 97 | crc[0] = cmd[1]; |
| 98 | crc[1] = cmd[0]; |
| 99 | crc[2] = cmd[7]; |
| 100 | crc[3] = cmd[6]; |
| 101 | crc[4] = cmd[5]; |
| 102 | |
| 103 | cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; |
| 104 | cmd[4] |= WSPI_INIT_CMD_END; |
| 105 | |
| 106 | t.tx_buf = cmd; |
| 107 | t.len = WSPI_INIT_CMD_LEN; |
| 108 | spi_message_add_tail(&t, &m); |
| 109 | |
| 110 | spi_sync(wl->spi, &m); |
| 111 | |
| 112 | wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); |
| 113 | } |
| 114 | |
Juuso Oikarinen | 545f1da | 2009-10-08 21:56:23 +0300 | [diff] [blame] | 115 | #define WL1271_BUSY_WORD_TIMEOUT 1000 |
| 116 | |
Luciano Coelho | 938e30c | 2009-10-15 10:33:27 +0300 | [diff] [blame] | 117 | /* FIXME: Check busy words, removed due to SPI bug */ |
| 118 | #if 0 |
| 119 | static void wl1271_spi_read_busy(struct wl1271 *wl, void *buf, size_t len) |
Juuso Oikarinen | 545f1da | 2009-10-08 21:56:23 +0300 | [diff] [blame] | 120 | { |
| 121 | struct spi_transfer t[1]; |
| 122 | struct spi_message m; |
| 123 | u32 *busy_buf; |
| 124 | int num_busy_bytes = 0; |
| 125 | |
| 126 | wl1271_info("spi read BUSY!"); |
| 127 | |
| 128 | /* |
| 129 | * Look for the non-busy word in the read buffer, and if found, |
| 130 | * read in the remaining data into the buffer. |
| 131 | */ |
| 132 | busy_buf = (u32 *)buf; |
| 133 | for (; (u32)busy_buf < (u32)buf + len; busy_buf++) { |
| 134 | num_busy_bytes += sizeof(u32); |
| 135 | if (*busy_buf & 0x1) { |
| 136 | spi_message_init(&m); |
| 137 | memset(t, 0, sizeof(t)); |
| 138 | memmove(buf, busy_buf, len - num_busy_bytes); |
| 139 | t[0].rx_buf = buf + (len - num_busy_bytes); |
| 140 | t[0].len = num_busy_bytes; |
| 141 | spi_message_add_tail(&t[0], &m); |
| 142 | spi_sync(wl->spi, &m); |
| 143 | return; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Read further busy words from SPI until a non-busy word is |
| 149 | * encountered, then read the data itself into the buffer. |
| 150 | */ |
| 151 | wl1271_info("spi read BUSY-polling needed!"); |
| 152 | |
| 153 | num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; |
| 154 | busy_buf = wl->buffer_busyword; |
| 155 | while (num_busy_bytes) { |
| 156 | num_busy_bytes--; |
| 157 | spi_message_init(&m); |
| 158 | memset(t, 0, sizeof(t)); |
| 159 | t[0].rx_buf = busy_buf; |
| 160 | t[0].len = sizeof(u32); |
| 161 | spi_message_add_tail(&t[0], &m); |
| 162 | spi_sync(wl->spi, &m); |
| 163 | |
| 164 | if (*busy_buf & 0x1) { |
| 165 | spi_message_init(&m); |
| 166 | memset(t, 0, sizeof(t)); |
| 167 | t[0].rx_buf = buf; |
| 168 | t[0].len = len; |
| 169 | spi_message_add_tail(&t[0], &m); |
| 170 | spi_sync(wl->spi, &m); |
| 171 | return; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | /* The SPI bus is unresponsive, the read failed. */ |
| 176 | memset(buf, 0, len); |
| 177 | wl1271_error("SPI read busy-word timeout!\n"); |
| 178 | } |
Luciano Coelho | 938e30c | 2009-10-15 10:33:27 +0300 | [diff] [blame] | 179 | #endif |
Juuso Oikarinen | 545f1da | 2009-10-08 21:56:23 +0300 | [diff] [blame] | 180 | |
Juuso Oikarinen | 7462141 | 2009-10-12 15:08:54 +0300 | [diff] [blame] | 181 | void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf, |
| 182 | size_t len, bool fixed) |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 183 | { |
| 184 | struct spi_transfer t[3]; |
| 185 | struct spi_message m; |
Juuso Oikarinen | 545f1da | 2009-10-08 21:56:23 +0300 | [diff] [blame] | 186 | u32 *busy_buf; |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 187 | u32 *cmd; |
| 188 | |
| 189 | cmd = &wl->buffer_cmd; |
| 190 | busy_buf = wl->buffer_busyword; |
| 191 | |
| 192 | *cmd = 0; |
| 193 | *cmd |= WSPI_CMD_READ; |
| 194 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; |
| 195 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; |
| 196 | |
| 197 | if (fixed) |
| 198 | *cmd |= WSPI_CMD_FIXED; |
| 199 | |
| 200 | spi_message_init(&m); |
| 201 | memset(t, 0, sizeof(t)); |
| 202 | |
| 203 | t[0].tx_buf = cmd; |
| 204 | t[0].len = 4; |
| 205 | spi_message_add_tail(&t[0], &m); |
| 206 | |
| 207 | /* Busy and non busy words read */ |
| 208 | t[1].rx_buf = busy_buf; |
| 209 | t[1].len = WL1271_BUSY_WORD_LEN; |
| 210 | spi_message_add_tail(&t[1], &m); |
| 211 | |
| 212 | t[2].rx_buf = buf; |
| 213 | t[2].len = len; |
| 214 | spi_message_add_tail(&t[2], &m); |
| 215 | |
| 216 | spi_sync(wl->spi, &m); |
| 217 | |
Juuso Oikarinen | c6d5d06 | 2009-10-13 12:47:47 +0300 | [diff] [blame] | 218 | /* FIXME: Check busy words, removed due to SPI bug */ |
| 219 | /* if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1)) |
| 220 | wl1271_spi_read_busy(wl, buf, len); */ |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 221 | |
| 222 | wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); |
| 223 | wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); |
| 224 | } |
| 225 | |
Juuso Oikarinen | 7462141 | 2009-10-12 15:08:54 +0300 | [diff] [blame] | 226 | void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf, |
| 227 | size_t len, bool fixed) |
Luciano Coelho | f5fc0f8 | 2009-08-06 16:25:28 +0300 | [diff] [blame] | 228 | { |
| 229 | struct spi_transfer t[2]; |
| 230 | struct spi_message m; |
| 231 | u32 *cmd; |
| 232 | |
| 233 | cmd = &wl->buffer_cmd; |
| 234 | |
| 235 | *cmd = 0; |
| 236 | *cmd |= WSPI_CMD_WRITE; |
| 237 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; |
| 238 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; |
| 239 | |
| 240 | if (fixed) |
| 241 | *cmd |= WSPI_CMD_FIXED; |
| 242 | |
| 243 | spi_message_init(&m); |
| 244 | memset(t, 0, sizeof(t)); |
| 245 | |
| 246 | t[0].tx_buf = cmd; |
| 247 | t[0].len = sizeof(*cmd); |
| 248 | spi_message_add_tail(&t[0], &m); |
| 249 | |
| 250 | t[1].tx_buf = buf; |
| 251 | t[1].len = len; |
| 252 | spi_message_add_tail(&t[1], &m); |
| 253 | |
| 254 | spi_sync(wl->spi, &m); |
| 255 | |
| 256 | wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); |
| 257 | wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); |
| 258 | } |