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>
65 #include <linux/acpi.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;
128 module_param(force_addr, ushort, 0);
129 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller");
131 static struct pci_driver sis5595_driver;
132 static unsigned short sis5595_base;
133 static struct pci_dev *sis5595_pdev;
135 static u8 sis5595_read(u8 reg)
137 outb(reg, sis5595_base + SMB_INDEX);
138 return inb(sis5595_base + SMB_DAT);
141 static void sis5595_write(u8 reg, u8 data)
143 outb(reg, sis5595_base + SMB_INDEX);
144 outb(data, sis5595_base + SMB_DAT);
147 static int sis5595_setup(struct pci_dev *SIS5595_dev)
152 int retval = -ENODEV;
154 /* Look for imposters */
155 for (i = blacklist; *i != 0; i++) {
157 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL);
159 dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i);
165 /* Determine the address of the SMBus areas */
166 pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base);
167 if (sis5595_base == 0 && force_addr == 0) {
168 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n");
173 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1);
174 dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base);
176 /* NB: We grab just the two SMBus registers here, but this may still
177 * interfere with ACPI :-( */
178 retval = acpi_check_region(sis5595_base + SMB_INDEX, 2,
179 sis5595_driver.name);
183 if (!request_region(sis5595_base + SMB_INDEX, 2,
184 sis5595_driver.name)) {
185 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n",
186 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1);
191 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base);
192 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base)
193 != PCIBIOS_SUCCESSFUL)
195 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a)
196 != PCIBIOS_SUCCESSFUL)
198 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) {
199 /* doesn't work for some chips! */
200 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n");
205 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
206 != PCIBIOS_SUCCESSFUL)
208 if ((val & 0x80) == 0) {
209 dev_info(&SIS5595_dev->dev, "enabling ACPI\n");
210 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80)
211 != PCIBIOS_SUCCESSFUL)
213 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val)
214 != PCIBIOS_SUCCESSFUL)
216 if ((val & 0x80) == 0) {
217 /* doesn't work for some chips? */
218 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n");
223 /* Everything is happy */
227 release_region(sis5595_base + SMB_INDEX, 2);
231 static int sis5595_transaction(struct i2c_adapter *adap)
237 /* Make sure the SMBus host is ready to start transmitting */
238 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
240 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp);
241 sis5595_write(SMB_STS_LO, temp & 0xff);
242 sis5595_write(SMB_STS_HI, temp >> 8);
243 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) {
244 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp);
247 dev_dbg(&adap->dev, "Successful!\n");
251 /* start the transaction by setting bit 4 */
252 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10);
254 /* We will always wait for a fraction of a second! */
257 temp = sis5595_read(SMB_STS_LO);
258 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT));
260 /* If the SMBus is still busy, we give up */
261 if (timeout >= MAX_TIMEOUT) {
262 dev_dbg(&adap->dev, "SMBus Timeout!\n");
267 dev_dbg(&adap->dev, "Error: Failed bus transaction\n");
272 dev_err(&adap->dev, "Bus collision! SMBus may be locked until "
273 "next hard reset (or not...)\n");
274 /* Clock stops and slave is stuck in mid-transmission */
278 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
280 sis5595_write(SMB_STS_LO, temp & 0xff);
281 sis5595_write(SMB_STS_HI, temp >> 8);
284 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8);
286 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp);
291 /* Return negative errno on error. */
292 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr,
293 unsigned short flags, char read_write,
294 u8 command, int size, union i2c_smbus_data *data)
299 case I2C_SMBUS_QUICK:
300 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
301 size = SIS5595_QUICK;
304 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
305 if (read_write == I2C_SMBUS_WRITE)
306 sis5595_write(SMB_CMD, command);
309 case I2C_SMBUS_BYTE_DATA:
310 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
311 sis5595_write(SMB_CMD, command);
312 if (read_write == I2C_SMBUS_WRITE)
313 sis5595_write(SMB_BYTE, data->byte);
314 size = SIS5595_BYTE_DATA;
316 case I2C_SMBUS_PROC_CALL:
317 case I2C_SMBUS_WORD_DATA:
318 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
319 sis5595_write(SMB_CMD, command);
320 if (read_write == I2C_SMBUS_WRITE) {
321 sis5595_write(SMB_BYTE, data->word & 0xff);
322 sis5595_write(SMB_BYTE + 1,
323 (data->word & 0xff00) >> 8);
325 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA;
328 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
332 sis5595_write(SMB_CTL_LO, ((size & 0x0E)));
334 status = sis5595_transaction(adap);
338 if ((size != SIS5595_PROC_CALL) &&
339 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK)))
345 case SIS5595_BYTE_DATA:
346 data->byte = sis5595_read(SMB_BYTE);
348 case SIS5595_WORD_DATA:
349 case SIS5595_PROC_CALL:
350 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8);
356 static u32 sis5595_func(struct i2c_adapter *adapter)
358 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
359 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
360 I2C_FUNC_SMBUS_PROC_CALL;
363 static const struct i2c_algorithm smbus_algorithm = {
364 .smbus_xfer = sis5595_access,
365 .functionality = sis5595_func,
368 static struct i2c_adapter sis5595_adapter = {
369 .owner = THIS_MODULE,
370 .id = I2C_HW_SMBUS_SIS5595,
371 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
372 .algo = &smbus_algorithm,
375 static struct pci_device_id sis5595_ids[] __devinitdata = {
376 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) },
380 MODULE_DEVICE_TABLE (pci, sis5595_ids);
382 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id)
386 if (sis5595_setup(dev)) {
387 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n");
391 /* set up the sysfs linkage to our parent device */
392 sis5595_adapter.dev.parent = &dev->dev;
394 sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x",
395 sis5595_base + SMB_INDEX);
396 err = i2c_add_adapter(&sis5595_adapter);
398 release_region(sis5595_base + SMB_INDEX, 2);
402 /* Always return failure here. This is to allow other drivers to bind
403 * to this pci device. We don't really want to have control over the
404 * pci device, we only wanted to read as few register values from it.
406 sis5595_pdev = pci_dev_get(dev);
410 static struct pci_driver sis5595_driver = {
411 .name = "sis5595_smbus",
412 .id_table = sis5595_ids,
413 .probe = sis5595_probe,
416 static int __init i2c_sis5595_init(void)
418 return pci_register_driver(&sis5595_driver);
421 static void __exit i2c_sis5595_exit(void)
423 pci_unregister_driver(&sis5595_driver);
425 i2c_del_adapter(&sis5595_adapter);
426 release_region(sis5595_base + SMB_INDEX, 2);
427 pci_dev_put(sis5595_pdev);
432 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
433 MODULE_DESCRIPTION("SIS5595 SMBus driver");
434 MODULE_LICENSE("GPL");
436 module_init(i2c_sis5595_init);
437 module_exit(i2c_sis5595_exit);