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/kernel.h>
59 #include <linux/module.h>
60 #include <linux/delay.h>
61 #include <linux/pci.h>
62 #include <linux/ioport.h>
63 #include <linux/init.h>
64 #include <linux/i2c.h>
67 static int blacklist[] = {
80 PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID
81 shows up in other chips so we use the 5511
83 PCI_DEVICE_ID_SI_5597,
84 PCI_DEVICE_ID_SI_5598,
85 0, /* terminates the list */
88 /* Length of ISA address segment */
89 #define SIS5595_EXTENT 8
90 /* SIS5595 SMBus registers */
91 #define SMB_STS_LO 0x00
92 #define SMB_STS_HI 0x01
93 #define SMB_CTL_LO 0x02
94 #define SMB_CTL_HI 0x03
105 /* PCI Address Constants */
106 #define SMB_INDEX 0x38
108 #define SIS5595_ENABLE_REG 0x40
109 #define ACPI_BASE 0x90
112 #define MAX_TIMEOUT 500
114 /* SIS5595 constants */
115 #define SIS5595_QUICK 0x00
116 #define SIS5595_BYTE 0x02
117 #define SIS5595_BYTE_DATA 0x04
118 #define SIS5595_WORD_DATA 0x06
119 #define SIS5595_PROC_CALL 0x08
120 #define SIS5595_BLOCK_DATA 0x0A
122 /* insmod parameters */
124 /* If force_addr is set to anything different from 0, we forcibly enable
125 the device at the given address. */
126 static u16 force_addr = 0;
127 module_param(force_addr, ushort, 0);
128 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
130 static unsigned short sis5595_base = 0;
132 static u8 sis5595_read(u8 reg)
134 outb(reg, sis5595_base + SMB_INDEX);
135 return inb(sis5595_base + SMB_DAT);
138 static void sis5595_write(u8 reg, u8 data)
140 outb(reg, sis5595_base + SMB_INDEX);
141 outb(data, sis5595_base + SMB_DAT);
144 static int sis5595_setup(struct pci_dev *SIS5595_dev)
149 int retval = -ENODEV;
151 /* Look for imposters */
152 for (i = blacklist; *i != 0; i++) {
154 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
156 dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
162 /* Determine the address of the SMBus areas */
163 pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
164 if (sis5595_base == 0 && force_addr == 0) {
165 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
170 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
171 dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
173 /* NB: We grab just the two SMBus registers here, but this may still
174 * interfere with ACPI :-( */
175 if (!request_region(sis5595_base + SMB_INDEX, 2, "sis5595-smbus")) {
176 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
177 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
182 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
183 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
184 != PCIBIOS_SUCCESSFUL)
186 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
187 != PCIBIOS_SUCCESSFUL)
189 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
190 /* doesn't work for some chips! */
191 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
196 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
197 != PCIBIOS_SUCCESSFUL)
199 if ((val & 0x80) == 0) {
200 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
201 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
202 != PCIBIOS_SUCCESSFUL)
204 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
205 != PCIBIOS_SUCCESSFUL)
207 if ((val & 0x80) == 0) {
208 /* doesn't work for some chips? */
209 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
214 /* Everything is happy */
218 release_region(sis5595_base + SMB_INDEX, 2);
222 static int sis5595_transaction(struct i2c_adapter *adap)
228 /* Make sure the SMBus host is ready to start transmitting */
229 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
231 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
232 sis5595_write(SMB_STS_LO, temp & 0xff);
233 sis5595_write(SMB_STS_HI, temp >> 8);
234 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
235 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
238 dev_dbg(&adap->dev, "Successfull!\n");
242 /* start the transaction by setting bit 4 */
243 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
245 /* We will always wait for a fraction of a second! */
248 temp = sis5595_read(SMB_STS_LO);
249 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
251 /* If the SMBus is still busy, we give up */
252 if (timeout >= MAX_TIMEOUT) {
253 dev_dbg(&adap->dev, "SMBus Timeout!\n");
258 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
263 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
264 "next hard reset (or not...)\n");
265 /* Clock stops and slave is stuck in mid-transmission */
269 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
271 sis5595_write(SMB_STS_LO, temp & 0xff);
272 sis5595_write(SMB_STS_HI, temp >> 8);
275 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
277 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
282 /* Return -1 on error. */
283 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
284 unsigned short flags, char read_write,
285 u8 command, int size, union i2c_smbus_data *data)
288 case I2C_SMBUS_QUICK:
289 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
290 size = SIS5595_QUICK;
293 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
294 if (read_write == I2C_SMBUS_WRITE)
295 sis5595_write(SMB_CMD, command);
298 case I2C_SMBUS_BYTE_DATA:
299 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
300 sis5595_write(SMB_CMD, command);
301 if (read_write == I2C_SMBUS_WRITE)
302 sis5595_write(SMB_BYTE, data->byte);
303 size = SIS5595_BYTE_DATA;
305 case I2C_SMBUS_PROC_CALL:
306 case I2C_SMBUS_WORD_DATA:
307 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
308 sis5595_write(SMB_CMD, command);
309 if (read_write == I2C_SMBUS_WRITE) {
310 sis5595_write(SMB_BYTE, data->word & 0xff);
311 sis5595_write(SMB_BYTE + 1,
312 (data->word & 0xff00) >> 8);
314 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
317 case I2C_SMBUS_BLOCK_DATA:
318 printk(KERN_WARNING "sis5595.o: Block data not yet implemented!\n");
323 printk(KERN_WARNING "sis5595.o: Unsupported transaction %d\n", size);
327 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
329 if (sis5595_transaction(adap))
332 if ((size != SIS5595_PROC_CALL) &&
333 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
338 case SIS5595_BYTE: /* Where is the result put? I assume here it is in
339 SMB_DATA but it might just as well be in the
340 SMB_CMD. No clue in the docs */
341 case SIS5595_BYTE_DATA:
342 data->byte = sis5595_read(SMB_BYTE);
344 case SIS5595_WORD_DATA:
345 case SIS5595_PROC_CALL:
346 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
352 static u32 sis5595_func(struct i2c_adapter *adapter)
354 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
355 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
356 I2C_FUNC_SMBUS_PROC_CALL;
359 static struct i2c_algorithm smbus_algorithm = {
360 .id = I2C_ALGO_SMBUS,
361 .smbus_xfer = sis5595_access,
362 .functionality = sis5595_func,
365 static struct i2c_adapter sis5595_adapter = {
366 .owner = THIS_MODULE,
367 .class = I2C_CLASS_HWMON,
369 .algo = &smbus_algorithm,
372 static struct pci_device_id sis5595_ids[] __devinitdata = {
373 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
377 MODULE_DEVICE_TABLE (pci, sis5595_ids);
379 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
381 if (sis5595_setup(dev)) {
382 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
386 /* set up the driverfs linkage to our parent device */
387 sis5595_adapter.dev.parent = &dev->dev;
389 sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x",
390 sis5595_base + SMB_INDEX);
391 return i2c_add_adapter(&sis5595_adapter);
394 static void __devexit sis5595_remove(struct pci_dev *dev)
396 i2c_del_adapter(&sis5595_adapter);
397 release_region(sis5595_base + SMB_INDEX, 2);
400 static struct pci_driver sis5595_driver = {
401 .name = "sis5595_smbus",
402 .id_table = sis5595_ids,
403 .probe = sis5595_probe,
404 .remove = __devexit_p(sis5595_remove),
407 static int __init i2c_sis5595_init(void)
409 return pci_register_driver(&sis5595_driver);
412 static void __exit i2c_sis5595_exit(void)
414 pci_unregister_driver(&sis5595_driver);
417 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
418 MODULE_DESCRIPTION("SIS5595 SMBus driver");
419 MODULE_LICENSE("GPL");
421 module_init(i2c_sis5595_init);
422 module_exit(i2c_sis5595_exit);