blob: 61abe0f33255291ffa7e274f0aed3a8f68f283d6 [file] [log] [blame]
Ben Gardner99c3adb2006-01-18 22:41:50 +01001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
3
4 National Semiconductor SCx200 ACCESS.bus support
Ben Gardner16ffc5c2006-01-18 22:48:26 +01005 Also supports the AMD CS5535 and AMD CS5536
Ben Gardner99c3adb2006-01-18 22:41:50 +01006
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 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 Gardner99c3adb2006-01-18 22:41:50 +010010
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 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 Gardner99c3adb2006-01-18 22:41:50 +010015
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 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 Gardner99c3adb2006-01-18 22:41:50 +010020
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 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 Torvalds1da177e2005-04-16 15:20:36 -070024*/
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/kernel.h>
29#include <linux/init.h>
30#include <linux/i2c.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/pci.h>
32#include <linux/delay.h>
Jean Delvare3fb9a652006-01-18 23:17:01 +010033#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/io.h>
35
36#include <linux/scx200.h>
37
38#define NAME "scx200_acb"
39
40MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
41MODULE_DESCRIPTION("NatSemi SCx200 ACCESS.bus Driver");
42MODULE_LICENSE("GPL");
43
44#define MAX_DEVICES 4
45static int base[MAX_DEVICES] = { 0x820, 0x840 };
46module_param_array(base, int, NULL, 0);
47MODULE_PARM_DESC(base, "Base addresses for the ACCESS.bus controllers");
48
Ben Gardnerf933ff52006-01-18 22:52:06 +010049#define POLL_TIMEOUT (HZ/5)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51enum scx200_acb_state {
52 state_idle,
53 state_address,
54 state_command,
55 state_repeat_start,
56 state_quick,
57 state_read,
58 state_write,
59};
60
61static const char *scx200_acb_state_name[] = {
62 "idle",
63 "address",
64 "command",
65 "repeat_start",
66 "quick",
67 "read",
68 "write",
69};
70
71/* Physical interface */
Ben Gardner99c3adb2006-01-18 22:41:50 +010072struct scx200_acb_iface {
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 struct scx200_acb_iface *next;
74 struct i2c_adapter adapter;
75 unsigned base;
Jean Delvare3fb9a652006-01-18 23:17:01 +010076 struct mutex mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78 /* State machine data */
79 enum scx200_acb_state state;
80 int result;
81 u8 address_byte;
82 u8 command;
83 u8 *ptr;
84 char needs_reset;
85 unsigned len;
Jordan Crouse80cd3a82006-06-12 21:44:28 +020086
87 /* PCI device info */
88 struct pci_dev *pdev;
89 int bar;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090};
91
92/* Register Definitions */
93#define ACBSDA (iface->base + 0)
94#define ACBST (iface->base + 1)
95#define ACBST_SDAST 0x40 /* SDA Status */
Ben Gardner99c3adb2006-01-18 22:41:50 +010096#define ACBST_BER 0x20
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#define ACBST_NEGACK 0x10 /* Negative Acknowledge */
98#define ACBST_STASTR 0x08 /* Stall After Start */
99#define ACBST_MASTER 0x02
100#define ACBCST (iface->base + 2)
101#define ACBCST_BB 0x02
102#define ACBCTL1 (iface->base + 3)
103#define ACBCTL1_STASTRE 0x80
104#define ACBCTL1_NMINTE 0x40
Ben Gardner99c3adb2006-01-18 22:41:50 +0100105#define ACBCTL1_ACK 0x10
106#define ACBCTL1_STOP 0x02
107#define ACBCTL1_START 0x01
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108#define ACBADDR (iface->base + 4)
109#define ACBCTL2 (iface->base + 5)
110#define ACBCTL2_ENABLE 0x01
111
112/************************************************************************/
113
114static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
115{
116 const char *errmsg;
117
Ben Gardneref4d9272006-01-18 22:43:10 +0100118 dev_dbg(&iface->adapter.dev, "state %s, status = 0x%02x\n",
119 scx200_acb_state_name[iface->state], status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
121 if (status & ACBST_BER) {
122 errmsg = "bus error";
123 goto error;
124 }
125 if (!(status & ACBST_MASTER)) {
126 errmsg = "not master";
127 goto error;
128 }
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100129 if (status & ACBST_NEGACK) {
130 dev_dbg(&iface->adapter.dev, "negative ack in state %s\n",
131 scx200_acb_state_name[iface->state]);
132
133 iface->state = state_idle;
134 iface->result = -ENXIO;
135
136 outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
137 outb(ACBST_STASTR | ACBST_NEGACK, ACBST);
Jordan Crouse95563d32006-04-28 22:53:30 +0200138
139 /* Reset the status register */
140 outb(0, ACBST);
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100141 return;
142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
144 switch (iface->state) {
145 case state_idle:
146 dev_warn(&iface->adapter.dev, "interrupt in idle state\n");
147 break;
148
149 case state_address:
150 /* Do a pointer write first */
151 outb(iface->address_byte & ~1, ACBSDA);
152
153 iface->state = state_command;
154 break;
155
156 case state_command:
157 outb(iface->command, ACBSDA);
158
159 if (iface->address_byte & 1)
160 iface->state = state_repeat_start;
161 else
162 iface->state = state_write;
163 break;
164
165 case state_repeat_start:
166 outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
167 /* fallthrough */
Ben Gardner99c3adb2006-01-18 22:41:50 +0100168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 case state_quick:
170 if (iface->address_byte & 1) {
Ben Gardner99c3adb2006-01-18 22:41:50 +0100171 if (iface->len == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
173 else
174 outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
175 outb(iface->address_byte, ACBSDA);
176
177 iface->state = state_read;
178 } else {
179 outb(iface->address_byte, ACBSDA);
180
181 iface->state = state_write;
182 }
183 break;
184
185 case state_read:
Thomas Andrewsfd627a02006-07-01 17:05:12 +0200186 /* Set ACK if _next_ byte will be the last one */
187 if (iface->len == 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
189 else
190 outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
191
Thomas Andrewsfd627a02006-07-01 17:05:12 +0200192 if (iface->len == 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 iface->result = 0;
194 iface->state = state_idle;
195 outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
196 }
197
Thomas Andrewsfd627a02006-07-01 17:05:12 +0200198 *iface->ptr++ = inb(ACBSDA);
199 --iface->len;
200
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 break;
202
203 case state_write:
204 if (iface->len == 0) {
205 iface->result = 0;
206 iface->state = state_idle;
207 outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
208 break;
209 }
Ben Gardner99c3adb2006-01-18 22:41:50 +0100210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 outb(*iface->ptr++, ACBSDA);
212 --iface->len;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 break;
215 }
216
217 return;
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 error:
220 dev_err(&iface->adapter.dev, "%s in state %s\n", errmsg,
221 scx200_acb_state_name[iface->state]);
222
223 iface->state = state_idle;
224 iface->result = -EIO;
225 iface->needs_reset = 1;
226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static void scx200_acb_poll(struct scx200_acb_iface *iface)
229{
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100230 u8 status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 unsigned long timeout;
232
233 timeout = jiffies + POLL_TIMEOUT;
David Woodhouse3e3183b2006-08-05 12:15:19 -0700234 while (1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 status = inb(ACBST);
Jordan Crouse95563d32006-04-28 22:53:30 +0200236
237 /* Reset the status register to avoid the hang */
238 outb(0, ACBST);
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if ((status & (ACBST_SDAST|ACBST_BER|ACBST_NEGACK)) != 0) {
241 scx200_acb_machine(iface, status);
242 return;
243 }
David Woodhouse3e3183b2006-08-05 12:15:19 -0700244 if (time_after(jiffies, timeout))
245 break;
246 cpu_relax();
247 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 }
249
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100250 dev_err(&iface->adapter.dev, "timeout in state %s\n",
251 scx200_acb_state_name[iface->state]);
252
253 iface->state = state_idle;
254 iface->result = -EIO;
255 iface->needs_reset = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258static void scx200_acb_reset(struct scx200_acb_iface *iface)
259{
260 /* Disable the ACCESS.bus device and Configure the SCL
Ben Gardner99c3adb2006-01-18 22:41:50 +0100261 frequency: 16 clock cycles */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 outb(0x70, ACBCTL2);
263 /* Polling mode */
264 outb(0, ACBCTL1);
265 /* Disable slave address */
266 outb(0, ACBADDR);
267 /* Enable the ACCESS.bus device */
268 outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
269 /* Free STALL after START */
270 outb(inb(ACBCTL1) & ~(ACBCTL1_STASTRE | ACBCTL1_NMINTE), ACBCTL1);
271 /* Send a STOP */
272 outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
273 /* Clear BER, NEGACK and STASTR bits */
274 outb(ACBST_BER | ACBST_NEGACK | ACBST_STASTR, ACBST);
275 /* Clear BB bit */
276 outb(inb(ACBCST) | ACBCST_BB, ACBCST);
277}
278
279static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
Ben Gardner99c3adb2006-01-18 22:41:50 +0100280 u16 address, unsigned short flags,
281 char rw, u8 command, int size,
282 union i2c_smbus_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283{
284 struct scx200_acb_iface *iface = i2c_get_adapdata(adapter);
285 int len;
286 u8 *buffer;
287 u16 cur_word;
288 int rc;
289
290 switch (size) {
291 case I2C_SMBUS_QUICK:
Ben Gardner99c3adb2006-01-18 22:41:50 +0100292 len = 0;
293 buffer = NULL;
294 break;
295
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 case I2C_SMBUS_BYTE:
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100297 len = 1;
298 buffer = rw ? &data->byte : &command;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100299 break;
300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 case I2C_SMBUS_BYTE_DATA:
Ben Gardner99c3adb2006-01-18 22:41:50 +0100302 len = 1;
303 buffer = &data->byte;
304 break;
305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 case I2C_SMBUS_WORD_DATA:
307 len = 2;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100308 cur_word = cpu_to_le16(data->word);
309 buffer = (u8 *)&cur_word;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 break;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100311
Jean Delvarec3efaca2006-07-01 17:06:43 +0200312 case I2C_SMBUS_I2C_BLOCK_DATA:
Ben Gardner99c3adb2006-01-18 22:41:50 +0100313 len = data->block[0];
Jean Delvarec3efaca2006-07-01 17:06:43 +0200314 if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
315 return -EINVAL;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100316 buffer = &data->block[1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 break;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 default:
Ben Gardner99c3adb2006-01-18 22:41:50 +0100320 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 }
322
Ben Gardneref4d9272006-01-18 22:43:10 +0100323 dev_dbg(&adapter->dev,
324 "size=%d, address=0x%x, command=0x%x, len=%d, read=%d\n",
325 size, address, command, len, rw);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327 if (!len && rw == I2C_SMBUS_READ) {
Ben Gardneref4d9272006-01-18 22:43:10 +0100328 dev_dbg(&adapter->dev, "zero length read\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 return -EINVAL;
330 }
331
Jean Delvare3fb9a652006-01-18 23:17:01 +0100332 mutex_lock(&iface->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100334 iface->address_byte = (address << 1) | rw;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 iface->command = command;
336 iface->ptr = buffer;
337 iface->len = len;
338 iface->result = -EINVAL;
339 iface->needs_reset = 0;
340
341 outb(inb(ACBCTL1) | ACBCTL1_START, ACBCTL1);
342
343 if (size == I2C_SMBUS_QUICK || size == I2C_SMBUS_BYTE)
344 iface->state = state_quick;
345 else
346 iface->state = state_address;
347
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 while (iface->state != state_idle)
349 scx200_acb_poll(iface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
351 if (iface->needs_reset)
352 scx200_acb_reset(iface);
353
354 rc = iface->result;
355
Jean Delvare3fb9a652006-01-18 23:17:01 +0100356 mutex_unlock(&iface->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 if (rc == 0 && size == I2C_SMBUS_WORD_DATA && rw == I2C_SMBUS_READ)
Ben Gardner99c3adb2006-01-18 22:41:50 +0100359 data->word = le16_to_cpu(cur_word);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361#ifdef DEBUG
Ben Gardneref4d9272006-01-18 22:43:10 +0100362 dev_dbg(&adapter->dev, "transfer done, result: %d", rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 if (buffer) {
364 int i;
365 printk(" data:");
366 for (i = 0; i < len; ++i)
367 printk(" %02x", buffer[i]);
368 }
369 printk("\n");
370#endif
371
372 return rc;
373}
374
375static u32 scx200_acb_func(struct i2c_adapter *adapter)
376{
377 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
378 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
Jean Delvarec3efaca2006-07-01 17:06:43 +0200379 I2C_FUNC_SMBUS_I2C_BLOCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
382/* For now, we only handle combined mode (smbus) */
Jean Delvare8f9082c2006-09-03 22:39:46 +0200383static const struct i2c_algorithm scx200_acb_algorithm = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 .smbus_xfer = scx200_acb_smbus_xfer,
385 .functionality = scx200_acb_func,
386};
387
388static struct scx200_acb_iface *scx200_acb_list;
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200389static DEFINE_MUTEX(scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390
Jean Delvare99173922006-06-12 21:46:04 +0200391static __init int scx200_acb_probe(struct scx200_acb_iface *iface)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
393 u8 val;
394
395 /* Disable the ACCESS.bus device and Configure the SCL
Ben Gardner99c3adb2006-01-18 22:41:50 +0100396 frequency: 16 clock cycles */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 outb(0x70, ACBCTL2);
398
399 if (inb(ACBCTL2) != 0x70) {
Ben Gardneref4d9272006-01-18 22:43:10 +0100400 pr_debug(NAME ": ACBCTL2 readback failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 return -ENXIO;
402 }
403
404 outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
405
406 val = inb(ACBCTL1);
407 if (val) {
Ben Gardneref4d9272006-01-18 22:43:10 +0100408 pr_debug(NAME ": disabled, but ACBCTL1=0x%02x\n",
409 val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 return -ENXIO;
411 }
412
413 outb(inb(ACBCTL2) | ACBCTL2_ENABLE, ACBCTL2);
414
415 outb(inb(ACBCTL1) | ACBCTL1_NMINTE, ACBCTL1);
416
417 val = inb(ACBCTL1);
418 if ((val & ACBCTL1_NMINTE) != ACBCTL1_NMINTE) {
Ben Gardneref4d9272006-01-18 22:43:10 +0100419 pr_debug(NAME ": enabled, but NMINTE won't be set, "
420 "ACBCTL1=0x%02x\n", val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 return -ENXIO;
422 }
423
424 return 0;
425}
426
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200427static __init struct scx200_acb_iface *scx200_create_iface(const char *text,
Jean Delvare12a917f2007-02-13 22:09:03 +0100428 struct device *dev, int index)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429{
430 struct scx200_acb_iface *iface;
431 struct i2c_adapter *adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Deepak Saxena5263ebb2005-10-17 23:09:43 +0200433 iface = kzalloc(sizeof(*iface), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (!iface) {
435 printk(KERN_ERR NAME ": can't allocate memory\n");
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200436 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 }
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 adapter = &iface->adapter;
440 i2c_set_adapdata(adapter, iface);
David Brownell2096b952007-05-01 23:26:28 +0200441 snprintf(adapter->name, sizeof(adapter->name), "%s ACB%d", text, index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 adapter->owner = THIS_MODULE;
Jean Delvare1684a9842005-08-11 23:51:10 +0200443 adapter->id = I2C_HW_SMBUS_SCX200;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 adapter->algo = &scx200_acb_algorithm;
445 adapter->class = I2C_CLASS_HWMON;
Jean Delvare12a917f2007-02-13 22:09:03 +0100446 adapter->dev.parent = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447
Jean Delvare3fb9a652006-01-18 23:17:01 +0100448 mutex_init(&iface->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200450 return iface;
451}
452
453static int __init scx200_acb_create(struct scx200_acb_iface *iface)
454{
455 struct i2c_adapter *adapter;
456 int rc;
457
458 adapter = &iface->adapter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
460 rc = scx200_acb_probe(iface);
461 if (rc) {
Ben Gardneref4d9272006-01-18 22:43:10 +0100462 printk(KERN_WARNING NAME ": probe failed\n");
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200463 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 }
465
466 scx200_acb_reset(iface);
467
468 if (i2c_add_adapter(adapter) < 0) {
Ben Gardneref4d9272006-01-18 22:43:10 +0100469 printk(KERN_ERR NAME ": failed to register\n");
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200470 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 }
472
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200473 mutex_lock(&scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 iface->next = scx200_acb_list;
475 scx200_acb_list = iface;
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200476 mutex_unlock(&scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
478 return 0;
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200479}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200481static __init int scx200_create_pci(const char *text, struct pci_dev *pdev,
482 int bar)
483{
484 struct scx200_acb_iface *iface;
485 int rc;
486
Jean Delvare12a917f2007-02-13 22:09:03 +0100487 iface = scx200_create_iface(text, &pdev->dev, 0);
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200488
489 if (iface == NULL)
490 return -ENOMEM;
491
492 iface->pdev = pdev;
493 iface->bar = bar;
494
Benjamin Herrenschmidt09483912007-12-20 15:28:09 +1100495 rc = pci_enable_device_io(iface->pdev);
Jeff Garzikffb3d132006-11-18 22:19:39 -0800496 if (rc)
497 goto errout_free;
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200498
499 rc = pci_request_region(iface->pdev, iface->bar, iface->adapter.name);
Jeff Garzikffb3d132006-11-18 22:19:39 -0800500 if (rc) {
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200501 printk(KERN_ERR NAME ": can't allocate PCI BAR %d\n",
502 iface->bar);
503 goto errout_free;
504 }
505
506 iface->base = pci_resource_start(iface->pdev, iface->bar);
507 rc = scx200_acb_create(iface);
508
509 if (rc == 0)
510 return 0;
511
512 pci_release_region(iface->pdev, iface->bar);
513 pci_dev_put(iface->pdev);
Ben Gardner9b7b6d32006-01-18 22:44:04 +0100514 errout_free:
515 kfree(iface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 return rc;
517}
518
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200519static int __init scx200_create_isa(const char *text, unsigned long base,
520 int index)
Ben Gardner16ffc5c2006-01-18 22:48:26 +0100521{
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200522 struct scx200_acb_iface *iface;
523 int rc;
Ben Gardner16ffc5c2006-01-18 22:48:26 +0100524
Jean Delvare12a917f2007-02-13 22:09:03 +0100525 iface = scx200_create_iface(text, NULL, index);
Ben Gardner16ffc5c2006-01-18 22:48:26 +0100526
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200527 if (iface == NULL)
528 return -ENOMEM;
529
Adrian Bunkdec1a992008-04-22 22:16:48 +0200530 if (!request_region(base, 8, iface->adapter.name)) {
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200531 printk(KERN_ERR NAME ": can't allocate io 0x%lx-0x%lx\n",
532 base, base + 8 - 1);
533 rc = -EBUSY;
534 goto errout_free;
Ben Gardner16ffc5c2006-01-18 22:48:26 +0100535 }
536
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200537 iface->base = base;
538 rc = scx200_acb_create(iface);
Ben Gardner16ffc5c2006-01-18 22:48:26 +0100539
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200540 if (rc == 0)
541 return 0;
542
543 release_region(base, 8);
544 errout_free:
545 kfree(iface);
546 return rc;
547}
548
549/* Driver data is an index into the scx200_data array that indicates
550 * the name and the BAR where the I/O address resource is located. ISA
551 * devices are flagged with a bar value of -1 */
552
553static struct pci_device_id scx200_pci[] = {
554 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE),
555 .driver_data = 0 },
556 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE),
557 .driver_data = 0 },
558 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA),
559 .driver_data = 1 },
560 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA),
561 .driver_data = 2 }
562};
563
564static struct {
565 const char *name;
566 int bar;
567} scx200_data[] = {
568 { "SCx200", -1 },
569 { "CS5535", 0 },
570 { "CS5536", 0 }
571};
572
573static __init int scx200_scan_pci(void)
574{
575 int data, dev;
576 int rc = -ENODEV;
577 struct pci_dev *pdev;
578
579 for(dev = 0; dev < ARRAY_SIZE(scx200_pci); dev++) {
580 pdev = pci_get_device(scx200_pci[dev].vendor,
581 scx200_pci[dev].device, NULL);
582
583 if (pdev == NULL)
584 continue;
585
586 data = scx200_pci[dev].driver_data;
587
588 /* if .bar is greater or equal to zero, this is a
589 * PCI device - otherwise, we assume
590 that the ports are ISA based
591 */
592
593 if (scx200_data[data].bar >= 0)
594 rc = scx200_create_pci(scx200_data[data].name, pdev,
595 scx200_data[data].bar);
596 else {
597 int i;
598
Jean Delvare4b4686e2007-05-01 23:26:30 +0200599 pci_dev_put(pdev);
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200600 for (i = 0; i < MAX_DEVICES; ++i) {
601 if (base[i] == 0)
602 continue;
603
604 rc = scx200_create_isa(scx200_data[data].name,
605 base[i],
606 i);
607 }
608 }
609
610 break;
611 }
612
613 return rc;
Ben Gardner16ffc5c2006-01-18 22:48:26 +0100614}
615
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616static int __init scx200_acb_init(void)
617{
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200618 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 pr_debug(NAME ": NatSemi SCx200 ACCESS.bus Driver\n");
621
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200622 rc = scx200_scan_pci();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
Jean Delvare6f9c2962006-04-26 22:50:32 +0200624 /* If at least one bus was created, init must succeed */
625 if (scx200_acb_list)
626 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 return rc;
628}
629
630static void __exit scx200_acb_cleanup(void)
631{
632 struct scx200_acb_iface *iface;
Ben Gardner99c3adb2006-01-18 22:41:50 +0100633
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200634 mutex_lock(&scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 while ((iface = scx200_acb_list) != NULL) {
636 scx200_acb_list = iface->next;
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200637 mutex_unlock(&scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639 i2c_del_adapter(&iface->adapter);
Jordan Crouse80cd3a82006-06-12 21:44:28 +0200640
641 if (iface->pdev) {
642 pci_release_region(iface->pdev, iface->bar);
643 pci_dev_put(iface->pdev);
644 }
645 else
646 release_region(iface->base, 8);
647
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 kfree(iface);
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200649 mutex_lock(&scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 }
Matthias Kaehlcke9d9c01c2007-07-12 14:12:28 +0200651 mutex_unlock(&scx200_acb_list_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652}
653
654module_init(scx200_acb_init);
655module_exit(scx200_acb_cleanup);