2 sis5595.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
5 Philip Edelbrock <phil@netroedge.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* Note: we assume there can only be one SIS5595 with one SMBus interface */
25 Note: all have mfr. ID 0x1039.
29 Note: these chips contain a 0008 device which is incompatible with the
30 5595. We recognize these by the presence of the listed
31 "blacklist" PCI ID and refuse to load.
33 NOT SUPPORTED PCI ID BLACKLIST PCI ID
54 * Add Block Transfers (ugly, but supported by the adapter)
58 #include <linux/config.h>
59 #include <linux/kernel.h>
60 #include <linux/module.h>
61 #include <linux/delay.h>
62 #include <linux/pci.h>
63 #include <linux/ioport.h>
64 #include <linux/init.h>
65 #include <linux/i2c.h>
68 static int blacklist[] = {
81 PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID
82 shows up in other chips so we use the 5511
84 PCI_DEVICE_ID_SI_5597,
85 PCI_DEVICE_ID_SI_5598,
86 0, /* terminates the list */
89 /* Length of ISA address segment */
90 #define SIS5595_EXTENT 8
91 /* SIS5595 SMBus registers */
92 #define SMB_STS_LO 0x00
93 #define SMB_STS_HI 0x01
94 #define SMB_CTL_LO 0x02
95 #define SMB_CTL_HI 0x03
100 #define SMB_BYTE 0x08
106 /* PCI Address Constants */
107 #define SMB_INDEX 0x38
109 #define SIS5595_ENABLE_REG 0x40
110 #define ACPI_BASE 0x90
113 #define MAX_TIMEOUT 500
115 /* SIS5595 constants */
116 #define SIS5595_QUICK 0x00
117 #define SIS5595_BYTE 0x02
118 #define SIS5595_BYTE_DATA 0x04
119 #define SIS5595_WORD_DATA 0x06
120 #define SIS5595_PROC_CALL 0x08
121 #define SIS5595_BLOCK_DATA 0x0A
123 /* insmod parameters */
125 /* If force_addr is set to anything different from 0, we forcibly enable
126 the device at the given address. */
127 static u16 force_addr = 0;
128 module_param(force_addr, ushort, 0);
129 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
131 static unsigned short sis5595_base = 0;
133 static u8 sis5595_read(u8 reg)
135 outb(reg, sis5595_base + SMB_INDEX);
136 return inb(sis5595_base + SMB_DAT);
139 static void sis5595_write(u8 reg, u8 data)
141 outb(reg, sis5595_base + SMB_INDEX);
142 outb(data, sis5595_base + SMB_DAT);
145 static int sis5595_setup(struct pci_dev *SIS5595_dev)
150 int retval = -ENODEV;
152 /* Look for imposters */
153 for (i = blacklist; *i != 0; i++) {
155 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
157 dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
163 /* Determine the address of the SMBus areas */
164 pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
165 if (sis5595_base == 0 && force_addr == 0) {
166 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
171 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
172 dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
174 /* NB: We grab just the two SMBus registers here, but this may still
175 * interfere with ACPI :-( */
176 if (!request_region(sis5595_base + SMB_INDEX, 2, "sis5595-smbus")) {
177 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
178 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
183 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
184 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
185 != PCIBIOS_SUCCESSFUL)
187 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
188 != PCIBIOS_SUCCESSFUL)
190 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
191 /* doesn't work for some chips! */
192 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
197 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
198 != PCIBIOS_SUCCESSFUL)
200 if ((val & 0x80) == 0) {
201 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
202 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
203 != PCIBIOS_SUCCESSFUL)
205 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
206 != PCIBIOS_SUCCESSFUL)
208 if ((val & 0x80) == 0) {
209 /* doesn't work for some chips? */
210 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
215 /* Everything is happy */
219 release_region(sis5595_base + SMB_INDEX, 2);
223 static int sis5595_transaction(struct i2c_adapter *adap)
229 /* Make sure the SMBus host is ready to start transmitting */
230 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
232 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting... \n", temp);
233 sis5595_write(SMB_STS_LO, temp & 0xff);
234 sis5595_write(SMB_STS_HI, temp >> 8);
235 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
236 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
239 dev_dbg(&adap->dev, "Successfull!\n");
243 /* start the transaction by setting bit 4 */
244 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
246 /* We will always wait for a fraction of a second! */
249 temp = sis5595_read(SMB_STS_LO);
250 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
252 /* If the SMBus is still busy, we give up */
253 if (timeout >= MAX_TIMEOUT) {
254 dev_dbg(&adap->dev, "SMBus Timeout!\n");
259 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
264 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
265 "next hard reset (or not...)\n");
266 /* Clock stops and slave is stuck in mid-transmission */
270 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
272 sis5595_write(SMB_STS_LO, temp & 0xff);
273 sis5595_write(SMB_STS_HI, temp >> 8);
276 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
278 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
283 /* Return -1 on error. */
284 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
285 unsigned short flags, char read_write,
286 u8 command, int size, union i2c_smbus_data *data)
289 case I2C_SMBUS_QUICK:
290 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
291 size = SIS5595_QUICK;
294 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
295 if (read_write == I2C_SMBUS_WRITE)
296 sis5595_write(SMB_CMD, command);
299 case I2C_SMBUS_BYTE_DATA:
300 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
301 sis5595_write(SMB_CMD, command);
302 if (read_write == I2C_SMBUS_WRITE)
303 sis5595_write(SMB_BYTE, data->byte);
304 size = SIS5595_BYTE_DATA;
306 case I2C_SMBUS_PROC_CALL:
307 case I2C_SMBUS_WORD_DATA:
308 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
309 sis5595_write(SMB_CMD, command);
310 if (read_write == I2C_SMBUS_WRITE) {
311 sis5595_write(SMB_BYTE, data->word & 0xff);
312 sis5595_write(SMB_BYTE + 1,
313 (data->word & 0xff00) >> 8);
315 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
318 case I2C_SMBUS_BLOCK_DATA:
319 printk(KERN_WARNING "sis5595.o: Block data not yet implemented!\n");
324 printk(KERN_WARNING "sis5595.o: Unsupported transaction %d\n", size);
328 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
330 if (sis5595_transaction(adap))
333 if ((size != SIS5595_PROC_CALL) &&
334 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
339 case SIS5595_BYTE: /* Where is the result put? I assume here it is in
340 SMB_DATA but it might just as well be in the
341 SMB_CMD. No clue in the docs */
342 case SIS5595_BYTE_DATA:
343 data->byte = sis5595_read(SMB_BYTE);
345 case SIS5595_WORD_DATA:
346 case SIS5595_PROC_CALL:
347 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
353 static u32 sis5595_func(struct i2c_adapter *adapter)
355 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
356 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
357 I2C_FUNC_SMBUS_PROC_CALL;
360 static struct i2c_algorithm smbus_algorithm = {
361 .name = "Non-I2C SMBus adapter",
362 .id = I2C_ALGO_SMBUS,
363 .smbus_xfer = sis5595_access,
364 .functionality = sis5595_func,
367 static struct i2c_adapter sis5595_adapter = {
368 .owner = THIS_MODULE,
369 .class = I2C_CLASS_HWMON,
371 .algo = &smbus_algorithm,
374 static struct pci_device_id sis5595_ids[] __devinitdata = {
375 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
379 MODULE_DEVICE_TABLE (pci, sis5595_ids);
381 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
383 if (sis5595_setup(dev)) {
384 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
388 /* set up the driverfs linkage to our parent device */
389 sis5595_adapter.dev.parent = &dev->dev;
391 sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x",
392 sis5595_base + SMB_INDEX);
393 return i2c_add_adapter(&sis5595_adapter);
396 static void __devexit sis5595_remove(struct pci_dev *dev)
398 i2c_del_adapter(&sis5595_adapter);
399 release_region(sis5595_base + SMB_INDEX, 2);
402 static struct pci_driver sis5595_driver = {
403 .name = "sis5595_smbus",
404 .id_table = sis5595_ids,
405 .probe = sis5595_probe,
406 .remove = __devexit_p(sis5595_remove),
409 static int __init i2c_sis5595_init(void)
411 return pci_register_driver(&sis5595_driver);
414 static void __exit i2c_sis5595_exit(void)
416 pci_unregister_driver(&sis5595_driver);
419 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
420 MODULE_DESCRIPTION("SIS5595 SMBus driver");
421 MODULE_LICENSE("GPL");
423 module_init(i2c_sis5595_init);
424 module_exit(i2c_sis5595_exit);