2 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
3 Philip Edelbrock <phil@netroedge.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /* Note: we assume there can only be one SIS5595 with one SMBus interface */
23 Note: all have mfr. ID 0x1039.
27 Note: these chips contain a 0008 device which is incompatible with the
28 5595. We recognize these by the presence of the listed
29 "blacklist" PCI ID and refuse to load.
31 NOT SUPPORTED PCI ID BLACKLIST PCI ID
52 * Add Block Transfers (ugly, but supported by the adapter)
56 #include <linux/kernel.h>
57 #include <linux/module.h>
58 #include <linux/delay.h>
59 #include <linux/pci.h>
60 #include <linux/ioport.h>
61 #include <linux/init.h>
62 #include <linux/i2c.h>
63 #include <linux/acpi.h>
66 static int blacklist[] = {
79 PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID
80 shows up in other chips so we use the 5511
82 PCI_DEVICE_ID_SI_5597,
83 PCI_DEVICE_ID_SI_5598,
84 0, /* terminates the list */
87 /* Length of ISA address segment */
88 #define SIS5595_EXTENT 8
89 /* SIS5595 SMBus registers */
90 #define SMB_STS_LO 0x00
91 #define SMB_STS_HI 0x01
92 #define SMB_CTL_LO 0x02
93 #define SMB_CTL_HI 0x03
104 /* PCI Address Constants */
105 #define SMB_INDEX 0x38
107 #define SIS5595_ENABLE_REG 0x40
108 #define ACPI_BASE 0x90
111 #define MAX_TIMEOUT 500
113 /* SIS5595 constants */
114 #define SIS5595_QUICK 0x00
115 #define SIS5595_BYTE 0x02
116 #define SIS5595_BYTE_DATA 0x04
117 #define SIS5595_WORD_DATA 0x06
118 #define SIS5595_PROC_CALL 0x08
119 #define SIS5595_BLOCK_DATA 0x0A
121 /* insmod parameters */
123 /* If force_addr is set to anything different from 0, we forcibly enable
124 the device at the given address. */
125 static u16 force_addr;
126 module_param(force_addr, ushort, 0);
127 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
129 static struct pci_driver sis5595_driver;
130 static unsigned short sis5595_base;
131 static struct pci_dev *sis5595_pdev;
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 retval = acpi_check_region(sis5595_base + SMB_INDEX, 2,
177 sis5595_driver.name);
181 if (!request_region(sis5595_base + SMB_INDEX, 2,
182 sis5595_driver.name)) {
183 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
184 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
189 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
190 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
191 != PCIBIOS_SUCCESSFUL)
193 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
194 != PCIBIOS_SUCCESSFUL)
196 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
197 /* doesn't work for some chips! */
198 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
203 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
204 != PCIBIOS_SUCCESSFUL)
206 if ((val & 0x80) == 0) {
207 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
208 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
209 != PCIBIOS_SUCCESSFUL)
211 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
212 != PCIBIOS_SUCCESSFUL)
214 if ((val & 0x80) == 0) {
215 /* doesn't work for some chips? */
216 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
221 /* Everything is happy */
225 release_region(sis5595_base + SMB_INDEX, 2);
229 static int sis5595_transaction(struct i2c_adapter *adap)
235 /* Make sure the SMBus host is ready to start transmitting */
236 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
238 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
239 sis5595_write(SMB_STS_LO, temp & 0xff);
240 sis5595_write(SMB_STS_HI, temp >> 8);
241 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
242 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
245 dev_dbg(&adap->dev, "Successful!\n");
249 /* start the transaction by setting bit 4 */
250 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
252 /* We will always wait for a fraction of a second! */
255 temp = sis5595_read(SMB_STS_LO);
256 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
258 /* If the SMBus is still busy, we give up */
259 if (timeout >= MAX_TIMEOUT) {
260 dev_dbg(&adap->dev, "SMBus Timeout!\n");
265 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
270 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
271 "next hard reset (or not...)\n");
272 /* Clock stops and slave is stuck in mid-transmission */
276 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
278 sis5595_write(SMB_STS_LO, temp & 0xff);
279 sis5595_write(SMB_STS_HI, temp >> 8);
282 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
284 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
289 /* Return negative errno on error. */
290 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
291 unsigned short flags, char read_write,
292 u8 command, int size, union i2c_smbus_data *data)
297 case I2C_SMBUS_QUICK:
298 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
299 size = SIS5595_QUICK;
302 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
303 if (read_write == I2C_SMBUS_WRITE)
304 sis5595_write(SMB_CMD, command);
307 case I2C_SMBUS_BYTE_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->byte);
312 size = SIS5595_BYTE_DATA;
314 case I2C_SMBUS_PROC_CALL:
315 case I2C_SMBUS_WORD_DATA:
316 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
317 sis5595_write(SMB_CMD, command);
318 if (read_write == I2C_SMBUS_WRITE) {
319 sis5595_write(SMB_BYTE, data->word & 0xff);
320 sis5595_write(SMB_BYTE + 1,
321 (data->word & 0xff00) >> 8);
323 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
326 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
330 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
332 status = sis5595_transaction(adap);
336 if ((size != SIS5595_PROC_CALL) &&
337 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
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 const 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 .id = I2C_HW_SMBUS_SIS5595,
369 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
370 .algo = &smbus_algorithm,
373 static struct pci_device_id sis5595_ids[] __devinitdata = {
374 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
378 MODULE_DEVICE_TABLE (pci, sis5595_ids);
380 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
384 if (sis5595_setup(dev)) {
385 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
389 /* set up the sysfs linkage to our parent device */
390 sis5595_adapter.dev.parent = &dev->dev;
392 snprintf(sis5595_adapter.name, sizeof(sis5595_adapter.name),
393 "SMBus SIS5595 adapter at %04x", sis5595_base + SMB_INDEX);
394 err = i2c_add_adapter(&sis5595_adapter);
396 release_region(sis5595_base + SMB_INDEX, 2);
400 /* Always return failure here. This is to allow other drivers to bind
401 * to this pci device. We don't really want to have control over the
402 * pci device, we only wanted to read as few register values from it.
404 sis5595_pdev = pci_dev_get(dev);
408 static struct pci_driver sis5595_driver = {
409 .name = "sis5595_smbus",
410 .id_table = sis5595_ids,
411 .probe = sis5595_probe,
414 static int __init i2c_sis5595_init(void)
416 return pci_register_driver(&sis5595_driver);
419 static void __exit i2c_sis5595_exit(void)
421 pci_unregister_driver(&sis5595_driver);
423 i2c_del_adapter(&sis5595_adapter);
424 release_region(sis5595_base + SMB_INDEX, 2);
425 pci_dev_put(sis5595_pdev);
430 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
431 MODULE_DESCRIPTION("SIS5595 SMBus driver");
432 MODULE_LICENSE("GPL");
434 module_init(i2c_sis5595_init);
435 module_exit(i2c_sis5595_exit);