Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> |
| 3 | |
| 4 | National Semiconductor SCx200 ACCESS.bus support |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 5 | Also supports the AMD CS5535 and AMD CS5536 |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 6 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | Based on i2c-keywest.c which is: |
| 8 | Copyright (c) 2001 Benjamin Herrenschmidt <benh@kernel.crashing.org> |
| 9 | Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com> |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 10 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | This program is free software; you can redistribute it and/or |
| 12 | modify it under the terms of the GNU General Public License as |
| 13 | published by the Free Software Foundation; either version 2 of the |
| 14 | License, or (at your option) any later version. |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | General Public License for more details. |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | */ |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/kernel.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/i2c.h> |
| 31 | #include <linux/smp_lock.h> |
| 32 | #include <linux/pci.h> |
| 33 | #include <linux/delay.h> |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 34 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/io.h> |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 36 | #include <asm/msr.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | #include <linux/scx200.h> |
| 39 | |
| 40 | #define NAME "scx200_acb" |
| 41 | |
| 42 | MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); |
| 43 | MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver"); |
| 44 | MODULE_LICENSE("GPL"); |
| 45 | |
| 46 | #define MAX_DEVICES 4 |
| 47 | static int base[MAX_DEVICES] = { 0x820, 0x840 }; |
| 48 | module_param_array(base, int, NULL, 0); |
| 49 | MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers"); |
| 50 | |
Ben Gardner | f933ff5 | 2006-01-18 22:52:06 +0100 | [diff] [blame] | 51 | #define POLL_TIMEOUT (HZ/5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
| 53 | enum scx200_acb_state { |
| 54 | state_idle, |
| 55 | state_address, |
| 56 | state_command, |
| 57 | state_repeat_start, |
| 58 | state_quick, |
| 59 | state_read, |
| 60 | state_write, |
| 61 | }; |
| 62 | |
| 63 | static const char *scx200_acb_state_name[] = { |
| 64 | "idle", |
| 65 | "address", |
| 66 | "command", |
| 67 | "repeat_start", |
| 68 | "quick", |
| 69 | "read", |
| 70 | "write", |
| 71 | }; |
| 72 | |
| 73 | /* Physical interface */ |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 74 | struct scx200_acb_iface { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | struct scx200_acb_iface *next; |
| 76 | struct i2c_adapter adapter; |
| 77 | unsigned base; |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 78 | struct mutex mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | /* State machine data */ |
| 81 | enum scx200_acb_state state; |
| 82 | int result; |
| 83 | u8 address_byte; |
| 84 | u8 command; |
| 85 | u8 *ptr; |
| 86 | char needs_reset; |
| 87 | unsigned len; |
| 88 | }; |
| 89 | |
| 90 | /* Register Definitions */ |
| 91 | #define ACBSDA (iface->base + 0) |
| 92 | #define ACBST (iface->base + 1) |
| 93 | #define ACBST_SDAST 0x40 /* SDA Status */ |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 94 | #define ACBST_BER 0x20 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #define ACBST_NEGACK 0x10 /* Negative Acknowledge */ |
| 96 | #define ACBST_STASTR 0x08 /* Stall After Start */ |
| 97 | #define ACBST_MASTER 0x02 |
| 98 | #define ACBCST (iface->base + 2) |
| 99 | #define ACBCST_BB 0x02 |
| 100 | #define ACBCTL1 (iface->base + 3) |
| 101 | #define ACBCTL1_STASTRE 0x80 |
| 102 | #define ACBCTL1_NMINTE 0x40 |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 103 | #define ACBCTL1_ACK 0x10 |
| 104 | #define ACBCTL1_STOP 0x02 |
| 105 | #define ACBCTL1_START 0x01 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #define ACBADDR (iface->base + 4) |
| 107 | #define ACBCTL2 (iface->base + 5) |
| 108 | #define ACBCTL2_ENABLE 0x01 |
| 109 | |
| 110 | /************************************************************************/ |
| 111 | |
| 112 | static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status) |
| 113 | { |
| 114 | const char *errmsg; |
| 115 | |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 116 | dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n", |
| 117 | scx200_acb_state_name[iface->state], status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | if (status & ACBST_BER) { |
| 120 | errmsg = "bus error"; |
| 121 | goto error; |
| 122 | } |
| 123 | if (!(status & ACBST_MASTER)) { |
| 124 | errmsg = "not master"; |
| 125 | goto error; |
| 126 | } |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 127 | if (status & ACBST_NEGACK) { |
| 128 | dev_dbg(&iface->adapter.dev, "negative ack in state %s\n", |
| 129 | scx200_acb_state_name[iface->state]); |
| 130 | |
| 131 | iface->state = state_idle; |
| 132 | iface->result = -ENXIO; |
| 133 | |
| 134 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 135 | outb(ACBST_STASTR | ACBST_NEGACK, ACBST); |
Jordan Crouse | 95563d3 | 2006-04-28 22:53:30 +0200 | [diff] [blame^] | 136 | |
| 137 | /* Reset the status register */ |
| 138 | outb(0, ACBST); |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 139 | return; |
| 140 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
| 142 | switch (iface->state) { |
| 143 | case state_idle: |
| 144 | dev_warn(&iface->adapter.dev, "interrupt in idle state\n"); |
| 145 | break; |
| 146 | |
| 147 | case state_address: |
| 148 | /* Do a pointer write first */ |
| 149 | outb(iface->address_byte & ~1, ACBSDA); |
| 150 | |
| 151 | iface->state = state_command; |
| 152 | break; |
| 153 | |
| 154 | case state_command: |
| 155 | outb(iface->command, ACBSDA); |
| 156 | |
| 157 | if (iface->address_byte & 1) |
| 158 | iface->state = state_repeat_start; |
| 159 | else |
| 160 | iface->state = state_write; |
| 161 | break; |
| 162 | |
| 163 | case state_repeat_start: |
| 164 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); |
| 165 | /* fallthrough */ |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | case state_quick: |
| 168 | if (iface->address_byte & 1) { |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 169 | if (iface->len == 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
| 171 | else |
| 172 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); |
| 173 | outb(iface->address_byte, ACBSDA); |
| 174 | |
| 175 | iface->state = state_read; |
| 176 | } else { |
| 177 | outb(iface->address_byte, ACBSDA); |
| 178 | |
| 179 | iface->state = state_write; |
| 180 | } |
| 181 | break; |
| 182 | |
| 183 | case state_read: |
| 184 | /* Set ACK if receiving the last byte */ |
| 185 | if (iface->len == 1) |
| 186 | outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1); |
| 187 | else |
| 188 | outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1); |
| 189 | |
| 190 | *iface->ptr++ = inb(ACBSDA); |
| 191 | --iface->len; |
| 192 | |
| 193 | if (iface->len == 0) { |
| 194 | iface->result = 0; |
| 195 | iface->state = state_idle; |
| 196 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 197 | } |
| 198 | |
| 199 | break; |
| 200 | |
| 201 | case state_write: |
| 202 | if (iface->len == 0) { |
| 203 | iface->result = 0; |
| 204 | iface->state = state_idle; |
| 205 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 206 | break; |
| 207 | } |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 208 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | outb(*iface->ptr++, ACBSDA); |
| 210 | --iface->len; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | break; |
| 213 | } |
| 214 | |
| 215 | return; |
| 216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | error: |
| 218 | dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg, |
| 219 | scx200_acb_state_name[iface->state]); |
| 220 | |
| 221 | iface->state = state_idle; |
| 222 | iface->result = -EIO; |
| 223 | iface->needs_reset = 1; |
| 224 | } |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | static void scx200_acb_poll(struct scx200_acb_iface *iface) |
| 227 | { |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 228 | u8 status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | unsigned long timeout; |
| 230 | |
| 231 | timeout = jiffies + POLL_TIMEOUT; |
| 232 | while (time_before(jiffies, timeout)) { |
| 233 | status = inb(ACBST); |
Jordan Crouse | 95563d3 | 2006-04-28 22:53:30 +0200 | [diff] [blame^] | 234 | |
| 235 | /* Reset the status register to avoid the hang */ |
| 236 | outb(0, ACBST); |
| 237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) { |
| 239 | scx200_acb_machine(iface, status); |
| 240 | return; |
| 241 | } |
Ben Gardner | f933ff5 | 2006-01-18 22:52:06 +0100 | [diff] [blame] | 242 | yield(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 245 | dev_err(&iface->adapter.dev, "timeout in state %s\n", |
| 246 | scx200_acb_state_name[iface->state]); |
| 247 | |
| 248 | iface->state = state_idle; |
| 249 | iface->result = -EIO; |
| 250 | iface->needs_reset = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
| 253 | static void scx200_acb_reset(struct scx200_acb_iface *iface) |
| 254 | { |
| 255 | /* Disable the ACCESS.bus device and Configure the SCL |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 256 | frequency: 16 clock cycles */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | outb(0x70, ACBCTL2); |
| 258 | /* Polling mode */ |
| 259 | outb(0, ACBCTL1); |
| 260 | /* Disable slave address */ |
| 261 | outb(0, ACBADDR); |
| 262 | /* Enable the ACCESS.bus device */ |
| 263 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); |
| 264 | /* Free STALL after START */ |
| 265 | outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1); |
| 266 | /* Send a STOP */ |
| 267 | outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1); |
| 268 | /* Clear BER, NEGACK and STASTR bits */ |
| 269 | outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST); |
| 270 | /* Clear BB bit */ |
| 271 | outb(inb(ACBCST) | ACBCST_BB, ACBCST); |
| 272 | } |
| 273 | |
| 274 | static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter, |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 275 | u16 address, unsigned short flags, |
| 276 | char rw, u8 command, int size, |
| 277 | union i2c_smbus_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
| 279 | struct scx200_acb_iface *iface = i2c_get_adapdata(adapter); |
| 280 | int len; |
| 281 | u8 *buffer; |
| 282 | u16 cur_word; |
| 283 | int rc; |
| 284 | |
| 285 | switch (size) { |
| 286 | case I2C_SMBUS_QUICK: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 287 | len = 0; |
| 288 | buffer = NULL; |
| 289 | break; |
| 290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | case I2C_SMBUS_BYTE: |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 292 | len = 1; |
| 293 | buffer = rw ? &data->byte : &command; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 294 | break; |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | case I2C_SMBUS_BYTE_DATA: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 297 | len = 1; |
| 298 | buffer = &data->byte; |
| 299 | break; |
| 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | case I2C_SMBUS_WORD_DATA: |
| 302 | len = 2; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 303 | cur_word = cpu_to_le16(data->word); |
| 304 | buffer = (u8 *)&cur_word; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | break; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 306 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | case I2C_SMBUS_BLOCK_DATA: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 308 | len = data->block[0]; |
| 309 | buffer = &data->block[1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | break; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | default: |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 313 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | } |
| 315 | |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 316 | dev_dbg(&adapter->dev, |
| 317 | "size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n", |
| 318 | size, address, command, len, rw); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
| 320 | if (!len && rw == I2C_SMBUS_READ) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 321 | dev_dbg(&adapter->dev, "zero length read\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | return -EINVAL; |
| 323 | } |
| 324 | |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 325 | mutex_lock(&iface->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 327 | iface->address_byte = (address << 1) | rw; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | iface->command = command; |
| 329 | iface->ptr = buffer; |
| 330 | iface->len = len; |
| 331 | iface->result = -EINVAL; |
| 332 | iface->needs_reset = 0; |
| 333 | |
| 334 | outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1); |
| 335 | |
| 336 | if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE) |
| 337 | iface->state = state_quick; |
| 338 | else |
| 339 | iface->state = state_address; |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | while (iface->state != state_idle) |
| 342 | scx200_acb_poll(iface); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
| 344 | if (iface->needs_reset) |
| 345 | scx200_acb_reset(iface); |
| 346 | |
| 347 | rc = iface->result; |
| 348 | |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 349 | mutex_unlock(&iface->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | |
| 351 | if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ) |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 352 | data->word = le16_to_cpu(cur_word); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | #ifdef DEBUG |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 355 | dev_dbg(&adapter->dev, "transfer done, result: %d", rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | if (buffer) { |
| 357 | int i; |
| 358 | printk(" data:"); |
| 359 | for (i = 0; i < len; ++i) |
| 360 | printk(" %02x", buffer[i]); |
| 361 | } |
| 362 | printk("\n"); |
| 363 | #endif |
| 364 | |
| 365 | return rc; |
| 366 | } |
| 367 | |
| 368 | static u32 scx200_acb_func(struct i2c_adapter *adapter) |
| 369 | { |
| 370 | return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
| 371 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
| 372 | I2C_FUNC_SMBUS_BLOCK_DATA; |
| 373 | } |
| 374 | |
| 375 | /* For now, we only handle combined mode (smbus) */ |
| 376 | static struct i2c_algorithm scx200_acb_algorithm = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | .smbus_xfer = scx200_acb_smbus_xfer, |
| 378 | .functionality = scx200_acb_func, |
| 379 | }; |
| 380 | |
| 381 | static struct scx200_acb_iface *scx200_acb_list; |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 382 | static DECLARE_MUTEX(scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | static int scx200_acb_probe(struct scx200_acb_iface *iface) |
| 385 | { |
| 386 | u8 val; |
| 387 | |
| 388 | /* Disable the ACCESS.bus device and Configure the SCL |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 389 | frequency: 16 clock cycles */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | outb(0x70, ACBCTL2); |
| 391 | |
| 392 | if (inb(ACBCTL2) != 0x70) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 393 | pr_debug(NAME ": ACBCTL2 readback failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | return -ENXIO; |
| 395 | } |
| 396 | |
| 397 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); |
| 398 | |
| 399 | val = inb(ACBCTL1); |
| 400 | if (val) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 401 | pr_debug(NAME ": disabled, but ACBCTL1=0x%02x\n", |
| 402 | val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | return -ENXIO; |
| 404 | } |
| 405 | |
| 406 | outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2); |
| 407 | |
| 408 | outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1); |
| 409 | |
| 410 | val = inb(ACBCTL1); |
| 411 | if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 412 | pr_debug(NAME ": enabled, but NMINTE won't be set, " |
| 413 | "ACBCTL1=0x%02x\n", val); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | return -ENXIO; |
| 415 | } |
| 416 | |
| 417 | return 0; |
| 418 | } |
| 419 | |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 420 | static int __init scx200_acb_create(const char *text, int base, int index) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | { |
| 422 | struct scx200_acb_iface *iface; |
| 423 | struct i2c_adapter *adapter; |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 424 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | |
Deepak Saxena | 5263ebb | 2005-10-17 23:09:43 +0200 | [diff] [blame] | 426 | iface = kzalloc(sizeof(*iface), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | if (!iface) { |
| 428 | printk(KERN_ERR NAME ": can't allocate memory\n"); |
| 429 | rc = -ENOMEM; |
| 430 | goto errout; |
| 431 | } |
| 432 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | adapter = &iface->adapter; |
| 434 | i2c_set_adapdata(adapter, iface); |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 435 | snprintf(adapter->name, I2C_NAME_SIZE, "%s ACB%d", text, index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | adapter->owner = THIS_MODULE; |
Jean Delvare | 1684a984 | 2005-08-11 23:51:10 +0200 | [diff] [blame] | 437 | adapter->id = I2C_HW_SMBUS_SCX200; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | adapter->algo = &scx200_acb_algorithm; |
| 439 | adapter->class = I2C_CLASS_HWMON; |
| 440 | |
Jean Delvare | 3fb9a65 | 2006-01-18 23:17:01 +0100 | [diff] [blame] | 441 | mutex_init(&iface->mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Jean Delvare | b33d079 | 2006-04-26 23:00:16 +0200 | [diff] [blame] | 443 | if (!request_region(base, 8, adapter->name)) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 444 | printk(KERN_ERR NAME ": can't allocate io 0x%x-0x%x\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | base, base + 8-1); |
| 446 | rc = -EBUSY; |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 447 | goto errout_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | } |
| 449 | iface->base = base; |
| 450 | |
| 451 | rc = scx200_acb_probe(iface); |
| 452 | if (rc) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 453 | printk(KERN_WARNING NAME ": probe failed\n"); |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 454 | goto errout_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | } |
| 456 | |
| 457 | scx200_acb_reset(iface); |
| 458 | |
| 459 | if (i2c_add_adapter(adapter) < 0) { |
Ben Gardner | ef4d927 | 2006-01-18 22:43:10 +0100 | [diff] [blame] | 460 | printk(KERN_ERR NAME ": failed to register\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | rc = -ENODEV; |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 462 | goto errout_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } |
| 464 | |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 465 | down(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | iface->next = scx200_acb_list; |
| 467 | scx200_acb_list = iface; |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 468 | up(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
| 470 | return 0; |
| 471 | |
Ben Gardner | 9b7b6d3 | 2006-01-18 22:44:04 +0100 | [diff] [blame] | 472 | errout_release: |
| 473 | release_region(iface->base, 8); |
| 474 | errout_free: |
| 475 | kfree(iface); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | errout: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return rc; |
| 478 | } |
| 479 | |
| 480 | static struct pci_device_id scx200[] = { |
| 481 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, |
| 482 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, |
| 483 | { }, |
| 484 | }; |
| 485 | |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 486 | static struct pci_device_id divil_pci[] = { |
| 487 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) }, |
| 488 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) }, |
| 489 | { } /* NULL entry */ |
| 490 | }; |
| 491 | |
| 492 | #define MSR_LBAR_SMB 0x5140000B |
| 493 | |
| 494 | static int scx200_add_cs553x(void) |
| 495 | { |
| 496 | u32 low, hi; |
| 497 | u32 smb_base; |
| 498 | |
| 499 | /* Grab & reserve the SMB I/O range */ |
| 500 | rdmsr(MSR_LBAR_SMB, low, hi); |
| 501 | |
| 502 | /* Check the IO mask and whether SMB is enabled */ |
| 503 | if (hi != 0x0000F001) { |
| 504 | printk(KERN_WARNING NAME ": SMBus not enabled\n"); |
| 505 | return -ENODEV; |
| 506 | } |
| 507 | |
| 508 | /* SMBus IO size is 8 bytes */ |
| 509 | smb_base = low & 0x0000FFF8; |
| 510 | |
| 511 | return scx200_acb_create("CS5535", smb_base, 0); |
| 512 | } |
| 513 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | static int __init scx200_acb_init(void) |
| 515 | { |
| 516 | int i; |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 517 | int rc = -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | |
| 519 | pr_debug(NAME ": NatSemi SCx200 ACCESS.bus Driver\n"); |
| 520 | |
| 521 | /* Verify that this really is a SCx200 processor */ |
Ben Gardner | 16ffc5c | 2006-01-18 22:48:26 +0100 | [diff] [blame] | 522 | if (pci_dev_present(scx200)) { |
| 523 | for (i = 0; i < MAX_DEVICES; ++i) { |
| 524 | if (base[i] > 0) |
| 525 | rc = scx200_acb_create("SCx200", base[i], i); |
| 526 | } |
| 527 | } else if (pci_dev_present(divil_pci)) |
| 528 | rc = scx200_add_cs553x(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | |
Jean Delvare | 6f9c296 | 2006-04-26 22:50:32 +0200 | [diff] [blame] | 530 | /* If at least one bus was created, init must succeed */ |
| 531 | if (scx200_acb_list) |
| 532 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | return rc; |
| 534 | } |
| 535 | |
| 536 | static void __exit scx200_acb_cleanup(void) |
| 537 | { |
| 538 | struct scx200_acb_iface *iface; |
Ben Gardner | 99c3adb | 2006-01-18 22:41:50 +0100 | [diff] [blame] | 539 | |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 540 | down(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | while ((iface = scx200_acb_list) != NULL) { |
| 542 | scx200_acb_list = iface->next; |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 543 | up(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | i2c_del_adapter(&iface->adapter); |
| 546 | release_region(iface->base, 8); |
| 547 | kfree(iface); |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 548 | down(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | } |
Ben Gardner | 8a05940 | 2006-01-18 22:46:26 +0100 | [diff] [blame] | 550 | up(&scx200_acb_list_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | module_init(scx200_acb_init); |
| 554 | module_exit(scx200_acb_cleanup); |