| /* |
| Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>, |
| Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>, |
| Mark D. Studebaker <mdsxyz123@yahoo.com> |
| Copyright (C) 2005 - 2008 Jean Delvare <khali@linux-fr.org> |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| |
| /* |
| Supports the following VIA south bridges: |
| |
| Chip name PCI ID REV I2C block |
| VT82C596A 0x3050 no |
| VT82C596B 0x3051 no |
| VT82C686A 0x3057 0x30 no |
| VT82C686B 0x3057 0x40 yes |
| VT8231 0x8235 no? |
| VT8233 0x3074 yes |
| VT8233A 0x3147 yes? |
| VT8235 0x3177 yes |
| VT8237R 0x3227 yes |
| VT8237A 0x3337 yes |
| VT8237S 0x3372 yes |
| VT8251 0x3287 yes |
| CX700 0x8324 yes |
| VX800/VX820 0x8353 yes |
| |
| Note: we assume there can only be one device, with one SMBus interface. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/pci.h> |
| #include <linux/kernel.h> |
| #include <linux/stddef.h> |
| #include <linux/ioport.h> |
| #include <linux/i2c.h> |
| #include <linux/init.h> |
| #include <linux/acpi.h> |
| #include <asm/io.h> |
| |
| static struct pci_dev *vt596_pdev; |
| |
| #define SMBBA1 0x90 |
| #define SMBBA2 0x80 |
| #define SMBBA3 0xD0 |
| |
| /* SMBus address offsets */ |
| static unsigned short vt596_smba; |
| #define SMBHSTSTS (vt596_smba + 0) |
| #define SMBHSTCNT (vt596_smba + 2) |
| #define SMBHSTCMD (vt596_smba + 3) |
| #define SMBHSTADD (vt596_smba + 4) |
| #define SMBHSTDAT0 (vt596_smba + 5) |
| #define SMBHSTDAT1 (vt596_smba + 6) |
| #define SMBBLKDAT (vt596_smba + 7) |
| |
| /* PCI Address Constants */ |
| |
| /* SMBus data in configuration space can be found in two places, |
| We try to select the better one */ |
| |
| static unsigned short SMBHSTCFG = 0xD2; |
| |
| /* Other settings */ |
| #define MAX_TIMEOUT 500 |
| |
| /* VT82C596 constants */ |
| #define VT596_QUICK 0x00 |
| #define VT596_BYTE 0x04 |
| #define VT596_BYTE_DATA 0x08 |
| #define VT596_WORD_DATA 0x0C |
| #define VT596_PROC_CALL 0x10 |
| #define VT596_BLOCK_DATA 0x14 |
| #define VT596_I2C_BLOCK_DATA 0x34 |
| |
| |
| /* If force is set to anything different from 0, we forcibly enable the |
| VT596. DANGEROUS! */ |
| static int force; |
| module_param(force, bool, 0); |
| MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!"); |
| |
| /* If force_addr is set to anything different from 0, we forcibly enable |
| the VT596 at the given address. VERY DANGEROUS! */ |
| static u16 force_addr; |
| module_param(force_addr, ushort, 0); |
| MODULE_PARM_DESC(force_addr, |
| "Forcibly enable the SMBus at the given address. " |
| "EXTREMELY DANGEROUS!"); |
| |
| |
| static struct pci_driver vt596_driver; |
| static struct i2c_adapter vt596_adapter; |
| |
| #define FEATURE_I2CBLOCK (1<<0) |
| static unsigned int vt596_features; |
| |
| #ifdef DEBUG |
| static void vt596_dump_regs(const char *msg, u8 size) |
| { |
| dev_dbg(&vt596_adapter.dev, "%s: STS=%02x CNT=%02x CMD=%02x ADD=%02x " |
| "DAT=%02x,%02x\n", msg, inb_p(SMBHSTSTS), inb_p(SMBHSTCNT), |
| inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), |
| inb_p(SMBHSTDAT1)); |
| |
| if (size == VT596_BLOCK_DATA |
| || size == VT596_I2C_BLOCK_DATA) { |
| int i; |
| |
| dev_dbg(&vt596_adapter.dev, "BLK="); |
| for (i = 0; i < I2C_SMBUS_BLOCK_MAX / 2; i++) |
| printk("%02x,", inb_p(SMBBLKDAT)); |
| printk("\n"); |
| dev_dbg(&vt596_adapter.dev, " "); |
| for (; i < I2C_SMBUS_BLOCK_MAX - 1; i++) |
| printk("%02x,", inb_p(SMBBLKDAT)); |
| printk("%02x\n", inb_p(SMBBLKDAT)); |
| } |
| } |
| #else |
| static inline void vt596_dump_regs(const char *msg, u8 size) { } |
| #endif |
| |
| /* Return -1 on error, 0 on success */ |
| static int vt596_transaction(u8 size) |
| { |
| int temp; |
| int result = 0; |
| int timeout = 0; |
| |
| vt596_dump_regs("Transaction (pre)", size); |
| |
| /* Make sure the SMBus host is ready to start transmitting */ |
| if ((temp = inb_p(SMBHSTSTS)) & 0x1F) { |
| dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). " |
| "Resetting...\n", temp); |
| |
| outb_p(temp, SMBHSTSTS); |
| if ((temp = inb_p(SMBHSTSTS)) & 0x1F) { |
| dev_err(&vt596_adapter.dev, "SMBus reset failed! " |
| "(0x%02x)\n", temp); |
| return -EBUSY; |
| } |
| } |
| |
| /* Start the transaction by setting bit 6 */ |
| outb_p(0x40 | size, SMBHSTCNT); |
| |
| /* We will always wait for a fraction of a second */ |
| do { |
| msleep(1); |
| temp = inb_p(SMBHSTSTS); |
| } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT)); |
| |
| /* If the SMBus is still busy, we give up */ |
| if (timeout >= MAX_TIMEOUT) { |
| result = -ETIMEDOUT; |
| dev_err(&vt596_adapter.dev, "SMBus timeout!\n"); |
| } |
| |
| if (temp & 0x10) { |
| result = -EIO; |
| dev_err(&vt596_adapter.dev, "Transaction failed (0x%02x)\n", |
| size); |
| } |
| |
| if (temp & 0x08) { |
| result = -EIO; |
| dev_err(&vt596_adapter.dev, "SMBus collision!\n"); |
| } |
| |
| if (temp & 0x04) { |
| int read = inb_p(SMBHSTADD) & 0x01; |
| result = -ENXIO; |
| /* The quick and receive byte commands are used to probe |
| for chips, so errors are expected, and we don't want |
| to frighten the user. */ |
| if (!((size == VT596_QUICK && !read) || |
| (size == VT596_BYTE && read))) |
| dev_err(&vt596_adapter.dev, "Transaction error!\n"); |
| } |
| |
| /* Resetting status register */ |
| if (temp & 0x1F) |
| outb_p(temp, SMBHSTSTS); |
| |
| vt596_dump_regs("Transaction (post)", size); |
| |
| return result; |
| } |
| |
| /* Return negative errno on error, 0 on success */ |
| static s32 vt596_access(struct i2c_adapter *adap, u16 addr, |
| unsigned short flags, char read_write, u8 command, |
| int size, union i2c_smbus_data *data) |
| { |
| int i; |
| int status; |
| |
| switch (size) { |
| case I2C_SMBUS_QUICK: |
| size = VT596_QUICK; |
| break; |
| case I2C_SMBUS_BYTE: |
| if (read_write == I2C_SMBUS_WRITE) |
| outb_p(command, SMBHSTCMD); |
| size = VT596_BYTE; |
| break; |
| case I2C_SMBUS_BYTE_DATA: |
| outb_p(command, SMBHSTCMD); |
| if (read_write == I2C_SMBUS_WRITE) |
| outb_p(data->byte, SMBHSTDAT0); |
| size = VT596_BYTE_DATA; |
| break; |
| case I2C_SMBUS_WORD_DATA: |
| outb_p(command, SMBHSTCMD); |
| if (read_write == I2C_SMBUS_WRITE) { |
| outb_p(data->word & 0xff, SMBHSTDAT0); |
| outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); |
| } |
| size = VT596_WORD_DATA; |
| break; |
| case I2C_SMBUS_PROC_CALL: |
| outb_p(command, SMBHSTCMD); |
| outb_p(data->word & 0xff, SMBHSTDAT0); |
| outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); |
| size = VT596_PROC_CALL; |
| break; |
| case I2C_SMBUS_I2C_BLOCK_DATA: |
| if (!(vt596_features & FEATURE_I2CBLOCK)) |
| goto exit_unsupported; |
| if (read_write == I2C_SMBUS_READ) |
| outb_p(data->block[0], SMBHSTDAT0); |
| /* Fall through */ |
| case I2C_SMBUS_BLOCK_DATA: |
| outb_p(command, SMBHSTCMD); |
| if (read_write == I2C_SMBUS_WRITE) { |
| u8 len = data->block[0]; |
| if (len > I2C_SMBUS_BLOCK_MAX) |
| len = I2C_SMBUS_BLOCK_MAX; |
| outb_p(len, SMBHSTDAT0); |
| inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ |
| for (i = 1; i <= len; i++) |
| outb_p(data->block[i], SMBBLKDAT); |
| } |
| size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ? |
| VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA; |
| break; |
| default: |
| goto exit_unsupported; |
| } |
| |
| outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD); |
| |
| status = vt596_transaction(size); |
| if (status) |
| return status; |
| |
| if (size == VT596_PROC_CALL) |
| read_write = I2C_SMBUS_READ; |
| |
| if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK)) |
| return 0; |
| |
| switch (size) { |
| case VT596_BYTE: |
| case VT596_BYTE_DATA: |
| data->byte = inb_p(SMBHSTDAT0); |
| break; |
| case VT596_WORD_DATA: |
| case VT596_PROC_CALL: |
| data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); |
| break; |
| case VT596_I2C_BLOCK_DATA: |
| case VT596_BLOCK_DATA: |
| data->block[0] = inb_p(SMBHSTDAT0); |
| if (data->block[0] > I2C_SMBUS_BLOCK_MAX) |
| data->block[0] = I2C_SMBUS_BLOCK_MAX; |
| inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ |
| for (i = 1; i <= data->block[0]; i++) |
| data->block[i] = inb_p(SMBBLKDAT); |
| break; |
| } |
| return 0; |
| |
| exit_unsupported: |
| dev_warn(&vt596_adapter.dev, "Unsupported transaction %d\n", |
| size); |
| return -EOPNOTSUPP; |
| } |
| |
| static u32 vt596_func(struct i2c_adapter *adapter) |
| { |
| u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
| I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
| I2C_SMBUS_PROC_CALL | I2C_FUNC_SMBUS_BLOCK_DATA; |
| |
| if (vt596_features & FEATURE_I2CBLOCK) |
| func |= I2C_FUNC_SMBUS_I2C_BLOCK; |
| return func; |
| } |
| |
| static const struct i2c_algorithm smbus_algorithm = { |
| .smbus_xfer = vt596_access, |
| .functionality = vt596_func, |
| }; |
| |
| static struct i2c_adapter vt596_adapter = { |
| .owner = THIS_MODULE, |
| .id = I2C_HW_SMBUS_VIA2, |
| .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
| .algo = &smbus_algorithm, |
| }; |
| |
| static int __devinit vt596_probe(struct pci_dev *pdev, |
| const struct pci_device_id *id) |
| { |
| unsigned char temp; |
| int error = -ENODEV; |
| |
| /* Determine the address of the SMBus areas */ |
| if (force_addr) { |
| vt596_smba = force_addr & 0xfff0; |
| force = 0; |
| goto found; |
| } |
| |
| if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) || |
| !(vt596_smba & 0x0001)) { |
| /* try 2nd address and config reg. for 596 */ |
| if (id->device == PCI_DEVICE_ID_VIA_82C596_3 && |
| !pci_read_config_word(pdev, SMBBA2, &vt596_smba) && |
| (vt596_smba & 0x0001)) { |
| SMBHSTCFG = 0x84; |
| } else { |
| /* no matches at all */ |
| dev_err(&pdev->dev, "Cannot configure " |
| "SMBus I/O Base address\n"); |
| return -ENODEV; |
| } |
| } |
| |
| vt596_smba &= 0xfff0; |
| if (vt596_smba == 0) { |
| dev_err(&pdev->dev, "SMBus base address " |
| "uninitialized - upgrade BIOS or use " |
| "force_addr=0xaddr\n"); |
| return -ENODEV; |
| } |
| |
| found: |
| error = acpi_check_region(vt596_smba, 8, vt596_driver.name); |
| if (error) |
| return error; |
| |
| if (!request_region(vt596_smba, 8, vt596_driver.name)) { |
| dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n", |
| vt596_smba); |
| return -ENODEV; |
| } |
| |
| pci_read_config_byte(pdev, SMBHSTCFG, &temp); |
| /* If force_addr is set, we program the new address here. Just to make |
| sure, we disable the VT596 first. */ |
| if (force_addr) { |
| pci_write_config_byte(pdev, SMBHSTCFG, temp & 0xfe); |
| pci_write_config_word(pdev, id->driver_data, vt596_smba); |
| pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01); |
| dev_warn(&pdev->dev, "WARNING: SMBus interface set to new " |
| "address 0x%04x!\n", vt596_smba); |
| } else if (!(temp & 0x01)) { |
| if (force) { |
| /* NOTE: This assumes I/O space and other allocations |
| * WERE done by the Bios! Don't complain if your |
| * hardware does weird things after enabling this. |
| * :') Check for Bios updates before resorting to |
| * this. |
| */ |
| pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01); |
| dev_info(&pdev->dev, "Enabling SMBus device\n"); |
| } else { |
| dev_err(&pdev->dev, "SMBUS: Error: Host SMBus " |
| "controller not enabled! - upgrade BIOS or " |
| "use force=1\n"); |
| goto release_region; |
| } |
| } |
| |
| dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba); |
| |
| switch (pdev->device) { |
| case PCI_DEVICE_ID_VIA_CX700: |
| case PCI_DEVICE_ID_VIA_VX800: |
| case PCI_DEVICE_ID_VIA_8251: |
| case PCI_DEVICE_ID_VIA_8237: |
| case PCI_DEVICE_ID_VIA_8237A: |
| case PCI_DEVICE_ID_VIA_8237S: |
| case PCI_DEVICE_ID_VIA_8235: |
| case PCI_DEVICE_ID_VIA_8233A: |
| case PCI_DEVICE_ID_VIA_8233_0: |
| vt596_features |= FEATURE_I2CBLOCK; |
| break; |
| case PCI_DEVICE_ID_VIA_82C686_4: |
| /* The VT82C686B (rev 0x40) does support I2C block |
| transactions, but the VT82C686A (rev 0x30) doesn't */ |
| if (pdev->revision >= 0x40) |
| vt596_features |= FEATURE_I2CBLOCK; |
| break; |
| } |
| |
| vt596_adapter.dev.parent = &pdev->dev; |
| snprintf(vt596_adapter.name, sizeof(vt596_adapter.name), |
| "SMBus Via Pro adapter at %04x", vt596_smba); |
| |
| vt596_pdev = pci_dev_get(pdev); |
| if (i2c_add_adapter(&vt596_adapter)) { |
| pci_dev_put(vt596_pdev); |
| vt596_pdev = NULL; |
| } |
| |
| /* Always return failure here. This is to allow other drivers to bind |
| * to this pci device. We don't really want to have control over the |
| * pci device, we only wanted to read as few register values from it. |
| */ |
| return -ENODEV; |
| |
| release_region: |
| release_region(vt596_smba, 8); |
| return error; |
| } |
| |
| static struct pci_device_id vt596_ids[] = { |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3), |
| .driver_data = SMBBA1 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3), |
| .driver_data = SMBBA1 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4), |
| .driver_data = SMBBA1 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237A), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237S), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4), |
| .driver_data = SMBBA1 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8251), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700), |
| .driver_data = SMBBA3 }, |
| { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX800), |
| .driver_data = SMBBA3 }, |
| { 0, } |
| }; |
| |
| MODULE_DEVICE_TABLE(pci, vt596_ids); |
| |
| static struct pci_driver vt596_driver = { |
| .name = "vt596_smbus", |
| .id_table = vt596_ids, |
| .probe = vt596_probe, |
| }; |
| |
| static int __init i2c_vt596_init(void) |
| { |
| return pci_register_driver(&vt596_driver); |
| } |
| |
| |
| static void __exit i2c_vt596_exit(void) |
| { |
| pci_unregister_driver(&vt596_driver); |
| if (vt596_pdev != NULL) { |
| i2c_del_adapter(&vt596_adapter); |
| release_region(vt596_smba, 8); |
| pci_dev_put(vt596_pdev); |
| vt596_pdev = NULL; |
| } |
| } |
| |
| MODULE_AUTHOR("Kyosti Malkki <kmalkki@cc.hut.fi>, " |
| "Mark D. Studebaker <mdsxyz123@yahoo.com> and " |
| "Jean Delvare <khali@linux-fr.org>"); |
| MODULE_DESCRIPTION("vt82c596 SMBus driver"); |
| MODULE_LICENSE("GPL"); |
| |
| module_init(i2c_vt596_init); |
| module_exit(i2c_vt596_exit); |