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;
127 module_param(force_addr, ushort, 0);
128 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
130 static struct pci_driver sis5595_driver;
131 static unsigned short sis5595_base;
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,
177 sis5595_driver.name)) {
178 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
179 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
184 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
185 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
186 != PCIBIOS_SUCCESSFUL)
188 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
189 != PCIBIOS_SUCCESSFUL)
191 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
192 /* doesn't work for some chips! */
193 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
198 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
199 != PCIBIOS_SUCCESSFUL)
201 if ((val & 0x80) == 0) {
202 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
203 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
204 != PCIBIOS_SUCCESSFUL)
206 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
207 != PCIBIOS_SUCCESSFUL)
209 if ((val & 0x80) == 0) {
210 /* doesn't work for some chips? */
211 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
216 /* Everything is happy */
220 release_region(sis5595_base + SMB_INDEX, 2);
224 static int sis5595_transaction(struct i2c_adapter *adap)
230 /* Make sure the SMBus host is ready to start transmitting */
231 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
233 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
234 sis5595_write(SMB_STS_LO, temp & 0xff);
235 sis5595_write(SMB_STS_HI, temp >> 8);
236 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
237 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
240 dev_dbg(&adap->dev, "Successfull!\n");
244 /* start the transaction by setting bit 4 */
245 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
247 /* We will always wait for a fraction of a second! */
250 temp = sis5595_read(SMB_STS_LO);
251 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
253 /* If the SMBus is still busy, we give up */
254 if (timeout >= MAX_TIMEOUT) {
255 dev_dbg(&adap->dev, "SMBus Timeout!\n");
260 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
265 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
266 "next hard reset (or not...)\n");
267 /* Clock stops and slave is stuck in mid-transmission */
271 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
273 sis5595_write(SMB_STS_LO, temp & 0xff);
274 sis5595_write(SMB_STS_HI, temp >> 8);
277 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
279 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
284 /* Return -1 on error. */
285 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
286 unsigned short flags, char read_write,
287 u8 command, int size, union i2c_smbus_data *data)
290 case I2C_SMBUS_QUICK:
291 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
292 size = SIS5595_QUICK;
295 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
296 if (read_write == I2C_SMBUS_WRITE)
297 sis5595_write(SMB_CMD, command);
300 case I2C_SMBUS_BYTE_DATA:
301 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
302 sis5595_write(SMB_CMD, command);
303 if (read_write == I2C_SMBUS_WRITE)
304 sis5595_write(SMB_BYTE, data->byte);
305 size = SIS5595_BYTE_DATA;
307 case I2C_SMBUS_PROC_CALL:
308 case I2C_SMBUS_WORD_DATA:
309 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
310 sis5595_write(SMB_CMD, command);
311 if (read_write == I2C_SMBUS_WRITE) {
312 sis5595_write(SMB_BYTE, data->word & 0xff);
313 sis5595_write(SMB_BYTE + 1,
314 (data->word & 0xff00) >> 8);
316 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
319 case I2C_SMBUS_BLOCK_DATA:
320 printk(KERN_WARNING "sis5595.o: Block data not yet implemented!\n");
325 printk(KERN_WARNING "sis5595.o: Unsupported transaction %d\n", size);
329 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
331 if (sis5595_transaction(adap))
334 if ((size != SIS5595_PROC_CALL) &&
335 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
340 case SIS5595_BYTE: /* Where is the result put? I assume here it is in
341 SMB_DATA but it might just as well be in the
342 SMB_CMD. No clue in the docs */
343 case SIS5595_BYTE_DATA:
344 data->byte = sis5595_read(SMB_BYTE);
346 case SIS5595_WORD_DATA:
347 case SIS5595_PROC_CALL:
348 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
354 static u32 sis5595_func(struct i2c_adapter *adapter)
356 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
357 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
358 I2C_FUNC_SMBUS_PROC_CALL;
361 static struct i2c_algorithm smbus_algorithm = {
362 .smbus_xfer = sis5595_access,
363 .functionality = sis5595_func,
366 static struct i2c_adapter sis5595_adapter = {
367 .owner = THIS_MODULE,
368 .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);