mirror of
https://github.com/lm-sensors/lm-sensors.git
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Mark M. Hoffman
e035136982
(mmh) functions in bus drivers. Backported from the 2.6 work of Greg KH. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1936 7894878c-1315-0410-8ee3-d5d059ff63e0
579 lines
14 KiB
C
579 lines
14 KiB
C
/*
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sis645.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 2003 Mark M. Hoffman <mhoffman@lightlink.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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This module must be considered BETA unless and until
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the chipset manufacturer releases a datasheet.
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The register definitions are based on the SiS630.
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The method for *finding* the registers is based on trial and error.
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A history of changes to this file is available by anonymous CVS:
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http://www2.lm-sensors.nu/~lm78/download.html
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*/
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/*
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Note: we assume there can only be one SiS645 with one SMBus interface
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*/
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/* #define DEBUG 1 */
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/i2c.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/io.h>
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#include "version.h"
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#include "sensors_compat.h"
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#define DRV_NAME "i2c-sis645"
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/* SiS645DX north bridge (defined in 2.4.21) */
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#ifndef PCI_DEVICE_ID_SI_646
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#define PCI_DEVICE_ID_SI_646 0x0646
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#endif
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/* SiS648 north bridge (defined in 2.4.21) */
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#ifndef PCI_DEVICE_ID_SI_648
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#define PCI_DEVICE_ID_SI_648 0x0648
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#endif
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/* SiS650 north bridge (defined in 2.4.19) */
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#ifndef PCI_DEVICE_ID_SI_650
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#define PCI_DEVICE_ID_SI_650 0x0650
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#endif
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/* SiS651 north bridge (defined in 2.4.21)*/
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#ifndef PCI_DEVICE_ID_SI_651
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#define PCI_DEVICE_ID_SI_651 0x0651
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#endif
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/* SiS746 north bridge (defined in 2.4.21) */
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#ifndef PCI_DEVICE_ID_SI_746
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#define PCI_DEVICE_ID_SI_746 0x0746
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#endif
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/* SiS85C503/5513 (LPC Bridge) */
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#ifndef PCI_DEVICE_ID_SI_LPC
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#define PCI_DEVICE_ID_SI_LPC 0x0018
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#endif
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/* SiS961 south bridge */
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#ifndef PCI_DEVICE_ID_SI_961
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#define PCI_DEVICE_ID_SI_961 0x0961
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#endif
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/* SiS962 south bridge */
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#ifndef PCI_DEVICE_ID_SI_962
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#define PCI_DEVICE_ID_SI_962 0x0962
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#endif
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/* SiS963 south bridge */
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#ifndef PCI_DEVICE_ID_SI_963
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#define PCI_DEVICE_ID_SI_963 0x0963
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#endif
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/* SMBus ID */
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#ifndef PCI_DEVICE_ID_SI_SMBUS
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#define PCI_DEVICE_ID_SI_SMBUS 0x16
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#endif
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/* base address register in PCI config space */
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#define SIS645_BAR 0x04
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/* SiS645 SMBus registers */
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#define SMB_STS 0x00
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#define SMB_EN 0x01
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#define SMB_CNT 0x02
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#define SMB_HOST_CNT 0x03
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#define SMB_ADDR 0x04
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#define SMB_CMD 0x05
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#define SMB_PCOUNT 0x06
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#define SMB_COUNT 0x07
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#define SMB_BYTE 0x08
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#define SMB_DEV_ADDR 0x10
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#define SMB_DB0 0x11
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#define SMB_DB1 0x12
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#define SMB_SAA 0x13
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/* register count for request_region */
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#define SMB_IOSIZE 0x20
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/* Other settings */
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#define MAX_TIMEOUT 500
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/* SiS645 SMBus constants */
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#define SIS645_QUICK 0x00
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#define SIS645_BYTE 0x01
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#define SIS645_BYTE_DATA 0x02
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#define SIS645_WORD_DATA 0x03
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#define SIS645_PROC_CALL 0x04
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#define SIS645_BLOCK_DATA 0x05
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static struct i2c_adapter sis645_adapter;
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static u16 sis645_smbus_base = 0;
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static inline u8 sis645_read(u8 reg)
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{
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return inb(sis645_smbus_base + reg) ;
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}
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static inline void sis645_write(u8 reg, u8 data)
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{
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outb(data, sis645_smbus_base + reg) ;
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}
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#ifdef CONFIG_HOTPLUG
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/* Turns on SMBus device if it is not; return 0 iff successful
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*/
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static int __devinit sis645_enable_smbus(struct pci_dev *dev)
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{
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u8 val = 0;
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pci_read_config_byte(dev, 0x77, &val);
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Config byte was 0x%02x.\n", val);
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#endif
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pci_write_config_byte(dev, 0x77, val & ~0x10);
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pci_read_config_byte(dev, 0x77, &val);
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if (val & 0x10) {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Config byte stuck!\n");
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#endif
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return -1;
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}
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return 0;
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}
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/* Builds the basic pci_dev for SiS645 SMBus
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*/
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static int __devinit sis645_build_dev(struct pci_dev **smbus_dev,
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struct pci_dev *bridge_dev)
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{
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struct pci_dev temp_dev;
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u16 vid = 0, did = 0;
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int ret;
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/* fill in the device structure for search */
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memset(&temp_dev, 0, sizeof(temp_dev));
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temp_dev.bus = bridge_dev->bus;
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temp_dev.sysdata = bridge_dev->bus->sysdata;
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temp_dev.hdr_type = PCI_HEADER_TYPE_NORMAL;
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/* the SMBus device is function 1 on the same unit as the ISA bridge */
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temp_dev.devfn = bridge_dev->devfn + 1;
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/* query to make sure */
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ret = pci_read_config_word(&temp_dev, PCI_VENDOR_ID, &vid);
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if (ret || PCI_VENDOR_ID_SI != vid) {
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printk(KERN_ERR DRV_NAME ": Couldn't find SMBus device!\n");
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return ret;
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}
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temp_dev.vendor = vid;
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ret = pci_read_config_word(&temp_dev, PCI_DEVICE_ID, &did);
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if (ret || PCI_DEVICE_ID_SI_SMBUS != did) {
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printk(KERN_ERR DRV_NAME ": Couldn't find SMBus device!\n");
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return ret;
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}
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temp_dev.device = did;
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/* ok, we've got it... request some memory and finish it off */
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*smbus_dev = kmalloc(sizeof(**smbus_dev), GFP_ATOMIC);
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if (NULL == *smbus_dev) {
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printk(KERN_ERR DRV_NAME ": Out of memory!\n");
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return -ENOMEM;
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}
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**smbus_dev = temp_dev;
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ret = pci_setup_device(*smbus_dev);
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if (ret) {
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printk(KERN_ERR DRV_NAME ": pci_setup_device failed (0x%08x)\n",ret);
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}
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return ret;
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}
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/* See if a SMBus can be found, and enable it if possible.
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*/
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static int __devinit sis645_hotplug_smbus(void)
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{
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int ret;
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struct pci_dev *smbus_dev, *bridge_dev ;
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if ((bridge_dev = pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_961, NULL)))
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printk(KERN_INFO DRV_NAME ": Found SiS961 south bridge.\n");
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else if ((bridge_dev = pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_962, NULL)))
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printk(KERN_INFO DRV_NAME ": Found SiS962 [MuTIOL Media IO].\n");
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else if ((bridge_dev = pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_963, NULL)))
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printk(KERN_INFO DRV_NAME ": Found SiS963 [MuTIOL Media IO].\n");
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else if ((bridge_dev = pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_503, NULL)) ||
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(bridge_dev = pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_LPC, NULL))) {
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printk(KERN_INFO DRV_NAME ": Found SiS south bridge in compatability mode(?)\n");
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/* look for known compatible north bridges */
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if ((NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_645, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_646, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_648, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_650, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_651, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_735, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_745, NULL))
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&& (NULL == pci_find_device(PCI_VENDOR_ID_SI,
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PCI_DEVICE_ID_SI_746, NULL))) {
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printk(KERN_ERR DRV_NAME ": Can't find suitable host bridge!\n");
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return -ENODEV;
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}
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} else {
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printk(KERN_ERR DRV_NAME ": Can't find suitable south bridge!\n");
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return -ENODEV;
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}
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/* if we get this far, we think the smbus device is present */
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if ((ret = sis645_enable_smbus(bridge_dev)))
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return ret;
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if ((ret = sis645_build_dev(&smbus_dev, bridge_dev)))
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return ret;
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if ((ret = pci_enable_device(smbus_dev))) {
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printk(KERN_ERR DRV_NAME ": Can't pci_enable SMBus device!"
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" (0x%08x)\n", ret);
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return ret;
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}
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pci_insert_device(smbus_dev, smbus_dev->bus);
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return 0;
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}
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#endif /* CONFIG_HOTPLUG */
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/* Execute a SMBus transaction.
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int size is from SIS645_QUICK to SIS645_BLOCK_DATA
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*/
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static int sis645_transaction(int size)
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{
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int temp;
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int result = 0;
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int timeout = 0;
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/* Make sure the SMBus host is ready to start transmitting */
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if (((temp = sis645_read(SMB_CNT)) & 0x03) != 0x00) {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": SMBus busy (0x%02x). Resetting...\n",
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temp);
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#endif
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/* kill the transaction */
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sis645_write(SMB_HOST_CNT, 0x20);
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/* check it again */
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if (((temp = sis645_read(SMB_CNT)) & 0x03) != 0x00) {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Failed! (0x%02x)\n", temp);
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#endif
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return -1;
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} else {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Successful!\n");
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#endif
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}
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}
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/* Turn off timeout interrupts, set fast host clock */
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sis645_write(SMB_CNT, 0x20);
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/* clear all (sticky) status flags */
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temp = sis645_read(SMB_STS);
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sis645_write(SMB_STS, temp & 0x1e);
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/* start the transaction by setting bit 4 and size bits */
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sis645_write(SMB_HOST_CNT, 0x10 | (size & 0x07));
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/* We will always wait for a fraction of a second! */
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do {
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i2c_delay(1);
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temp = sis645_read(SMB_STS);
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} while (!(temp & 0x0e) && (timeout++ < MAX_TIMEOUT));
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/* If the SMBus is still busy, we give up */
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if (timeout >= MAX_TIMEOUT) {
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printk(KERN_DEBUG DRV_NAME ": SMBus Timeout! (0x%02x)\n",temp);
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result = -1;
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}
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/* device error - probably missing ACK */
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if (temp & 0x02) {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Failed bus transaction!\n");
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#endif
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result = -1;
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}
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/* bus collision */
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if (temp & 0x04) {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Bus collision!\n");
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#endif
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result = -1;
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}
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/* Finish up by resetting the bus */
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sis645_write(SMB_STS, temp);
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if ((temp = sis645_read(SMB_STS))) {
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#ifdef DEBUG
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printk(KERN_DEBUG DRV_NAME ": Failed reset at end of transaction!"
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" (0x%02x)\n", temp);
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#endif
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}
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return result;
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}
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/* Return -1 on error. */
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static s32 sis645_access(struct i2c_adapter * adap, u16 addr,
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unsigned short flags, char read_write,
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u8 command, int size, union i2c_smbus_data * data)
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{
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switch (size) {
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case I2C_SMBUS_QUICK:
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sis645_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
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size = SIS645_QUICK;
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break;
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case I2C_SMBUS_BYTE:
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sis645_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
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if (read_write == I2C_SMBUS_WRITE)
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sis645_write(SMB_CMD, command);
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size = SIS645_BYTE;
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break;
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case I2C_SMBUS_BYTE_DATA:
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sis645_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
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sis645_write(SMB_CMD, command);
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if (read_write == I2C_SMBUS_WRITE)
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sis645_write(SMB_BYTE, data->byte);
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size = SIS645_BYTE_DATA;
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break;
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case I2C_SMBUS_PROC_CALL:
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case I2C_SMBUS_WORD_DATA:
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sis645_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01));
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sis645_write(SMB_CMD, command);
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if (read_write == I2C_SMBUS_WRITE) {
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sis645_write(SMB_BYTE, data->word & 0xff);
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sis645_write(SMB_BYTE + 1, (data->word & 0xff00) >> 8);
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}
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size = (size == I2C_SMBUS_PROC_CALL ? SIS645_PROC_CALL : SIS645_WORD_DATA);
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break;
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case I2C_SMBUS_BLOCK_DATA:
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/* TO DO: */
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printk(KERN_INFO DRV_NAME ": SMBus block not implemented!\n");
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return -1;
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break;
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default:
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printk(KERN_INFO DRV_NAME ": Unsupported I2C size\n");
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return -1;
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break;
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}
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if (sis645_transaction(size))
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return -1;
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if ((size != SIS645_PROC_CALL) &&
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((read_write == I2C_SMBUS_WRITE) || (size == SIS645_QUICK)))
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return 0;
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switch (size) {
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case SIS645_BYTE:
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case SIS645_BYTE_DATA:
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data->byte = sis645_read(SMB_BYTE);
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break;
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case SIS645_WORD_DATA:
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case SIS645_PROC_CALL:
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data->word = sis645_read(SMB_BYTE) +
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(sis645_read(SMB_BYTE + 1) << 8);
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break;
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}
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return 0;
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}
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static u32 sis645_func(struct i2c_adapter *adapter)
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{
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return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_PROC_CALL;
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}
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static struct i2c_algorithm smbus_algorithm = {
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.name = "Non-I2C SMBus adapter",
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.id = I2C_ALGO_SMBUS,
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.smbus_xfer = sis645_access,
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.functionality = sis645_func,
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};
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static struct i2c_adapter sis645_adapter = {
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.owner = THIS_MODULE,
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.name = "unset",
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.id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_SIS645,
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.algo = &smbus_algorithm,
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};
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static struct pci_device_id sis645_ids[] __devinitdata = {
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{
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.vendor = PCI_VENDOR_ID_SI,
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.device = PCI_DEVICE_ID_SI_SMBUS,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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},
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{ 0, }
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};
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static int __devinit sis645_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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u16 ww = 0;
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int retval;
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if (sis645_smbus_base) {
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dev_err(dev, "Only one device supported.\n");
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return -EBUSY;
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}
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pci_read_config_word(dev, PCI_CLASS_DEVICE, &ww);
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if (PCI_CLASS_SERIAL_SMBUS != ww) {
|
|
dev_err(dev, "Unsupported device class 0x%04x!\n", ww);
|
|
return -ENODEV;
|
|
}
|
|
|
|
sis645_smbus_base = pci_resource_start(dev, SIS645_BAR);
|
|
if (!sis645_smbus_base) {
|
|
dev_err(dev, "SiS645 SMBus base address "
|
|
"not initialized!\n");
|
|
return -EINVAL;
|
|
}
|
|
dev_info(dev, "SiS645 SMBus base address: 0x%04x\n",
|
|
sis645_smbus_base);
|
|
|
|
/* Everything is happy, let's grab the memory and set things up. */
|
|
if (!request_region(sis645_smbus_base, SMB_IOSIZE, "sis645-smbus")) {
|
|
dev_err(dev, "SMBus registers 0x%04x-0x%04x "
|
|
"already in use!\n", sis645_smbus_base,
|
|
sis645_smbus_base + SMB_IOSIZE - 1);
|
|
|
|
sis645_smbus_base = 0;
|
|
return -EINVAL;
|
|
}
|
|
|
|
sprintf(sis645_adapter.name, "SiS645 SMBus adapter at 0x%04x",
|
|
sis645_smbus_base);
|
|
|
|
if ((retval = i2c_add_adapter(&sis645_adapter))) {
|
|
dev_err(dev, "Couldn't register adapter!\n");
|
|
release_region(sis645_smbus_base, SMB_IOSIZE);
|
|
sis645_smbus_base = 0;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void __devexit sis645_remove(struct pci_dev *dev)
|
|
{
|
|
if (sis645_smbus_base) {
|
|
i2c_del_adapter(&sis645_adapter);
|
|
release_region(sis645_smbus_base, SMB_IOSIZE);
|
|
sis645_smbus_base = 0;
|
|
}
|
|
}
|
|
|
|
static struct pci_driver sis645_driver = {
|
|
.name = "sis645 smbus",
|
|
.id_table = sis645_ids,
|
|
.probe = sis645_probe,
|
|
.remove = __devexit_p(sis645_remove),
|
|
};
|
|
|
|
static int __init i2c_sis645_init(void)
|
|
{
|
|
printk(KERN_INFO DRV_NAME ".o version %s (%s)\n", LM_VERSION, LM_DATE);
|
|
|
|
/* if the required device id is not present, try to HOTPLUG it first */
|
|
if (!pci_find_device(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_SMBUS, NULL)) {
|
|
|
|
printk(KERN_INFO DRV_NAME ": "
|
|
"Attempting to enable SiS645 SMBus device\n");
|
|
|
|
#ifdef CONFIG_HOTPLUG
|
|
sis645_hotplug_smbus();
|
|
#else
|
|
printk(KERN_INFO DRV_NAME ": "
|
|
"Requires kernel with CONFIG_HOTPLUG, sorry!\n");
|
|
#endif
|
|
}
|
|
|
|
return pci_module_init(&sis645_driver);
|
|
}
|
|
|
|
static void __exit i2c_sis645_exit(void)
|
|
{
|
|
pci_unregister_driver(&sis645_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
|
|
MODULE_DESCRIPTION("SiS645 SMBus driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* Register initialization functions using helper macros */
|
|
module_init(i2c_sis645_init);
|
|
module_exit(i2c_sis645_exit);
|