mirror of
https://github.com/lm-sensors/lm-sensors.git
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(Phil) Renamed i2c-via2.c to i2c-viapro.c.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@519 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Philip Edelbrock committed
1 parent
94471039a6
commit
a55703e80b
1 file changed
-552
@@ -1,552 +0,0 @@
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/*
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i2c-via2.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>,
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Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>
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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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/* Note: we assume there can only be one VT596A/B, with one SMBus interface */
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <asm/io.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 "version.h"
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#include "compat.h"
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,1,54))
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#include <linux/bios32.h>
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#endif
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,53)
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#include <linux/init.h>
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#else
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#define __init
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#define __initdata
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#endif
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#ifndef PCI_DEVICE_ID_VIA_82C596_3
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#define PCI_DEVICE_ID_VIA_82C596_3 0x3050
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#endif
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#ifndef PCI_DEVICE_ID_VIA_82C686_4
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#define PCI_DEVICE_ID_VIA_82C686_4 0x3057
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#endif
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/* SMBus address offsets */
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#define SMBHSTSTS (0 + vt596_smba)
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#define SMBHSLVSTS (1 + vt596_smba)
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#define SMBHSTCNT (2 + vt596_smba)
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#define SMBHSTCMD (3 + vt596_smba)
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#define SMBHSTADD (4 + vt596_smba)
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#define SMBHSTDAT0 (5 + vt596_smba)
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#define SMBHSTDAT1 (6 + vt596_smba)
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#define SMBBLKDAT (7 + vt596_smba)
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#define SMBSLVCNT (8 + vt596_smba)
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#define SMBSHDWCMD (9 + vt596_smba)
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#define SMBSLVEVT (0xA + vt596_smba)
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#define SMBSLVDAT (0xC + vt596_smba)
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/* PCI Address Constants */
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/* SMBus data in configuration space can be found in two places,
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We try to select the better one*/
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static unsigned short smb_cf_base;
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static unsigned short smb_cf_hstcfg;
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#define SMBBA1 0x90
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#define SMBBA2 0x80
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#define SMBBA (smb_cf_base)
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#define SMBHSTCFG (smb_cf_hstcfg)
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#define SMBSLVC (SMBHSTCFG+1)
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#define SMBSHDW1 (SMBHSTCFG+2)
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#define SMBSHDW2 (SMBHSTCFG+3)
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#define SMBREV (SMBHSTCFG+4)
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/* Other settings */
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#define MAX_TIMEOUT 500
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#define ENABLE_INT9 0
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/* VT82C596 constants */
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#define VT596_QUICK 0x00
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#define VT596_BYTE 0x04
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#define VT596_BYTE_DATA 0x08
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#define VT596_WORD_DATA 0x0C
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#define VT596_BLOCK_DATA 0x14
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/* insmod parameters */
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/* If force is set to anything different from 0, we forcibly enable the
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VT596. DANGEROUS! */
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static int force = 0;
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MODULE_PARM(force,"i");
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MODULE_PARM_DESC(force,"Forcibly enable the VT82C596 SMBus. DANGEROUS!");
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/* If force_addr is set to anything different from 0, we forcibly enable
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the VT596 at the given address. VERY DANGEROUS! */
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static int force_addr = 0;
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MODULE_PARM(force_addr,"i");
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MODULE_PARM_DESC(force_addr,"Forcibly enable the VT82C596 SMBus at the given address. "
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"EXTREMELY DANGEROUS!");
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#ifdef MODULE
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static
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#else
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extern
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#endif
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int __init i2c_vt596_init(void);
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static int __init vt596_cleanup(void);
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static int vt596_setup(void);
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static s32 vt596_access(struct i2c_adapter *adap, u8 addr, char read_write,
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u8 command, int size, union i2c_smbus_data * data);
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static void vt596_do_pause( unsigned int amount );
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static int vt596_transaction(void);
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static void vt596_inc(struct i2c_adapter *adapter);
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static void vt596_dec(struct i2c_adapter *adapter);
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#ifdef MODULE
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extern int init_module(void);
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extern int cleanup_module(void);
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#endif /* MODULE */
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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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/* master_xfer */ NULL,
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/* smbus_access */ vt596_access,
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/* slave_send */ NULL,
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/* slave_rcv */ NULL,
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/* algo_control */ NULL,
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};
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static struct i2c_adapter vt596_adapter = {
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"unset",
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I2C_ALGO_SMBUS | I2C_HW_SMBUS_VIA2,
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&smbus_algorithm,
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NULL,
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vt596_inc,
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vt596_dec,
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NULL,
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NULL,
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};
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static int __initdata vt596_initialized;
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static unsigned short vt596_smba = 0;
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/* Detect whether a VT596 can be found, and initialize it, where necessary.
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Note the differences between kernels with the old PCI BIOS interface and
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newer kernels with the real PCI interface. In compat.h some things are
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defined to make the transition easier. */
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int vt596_setup(void)
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{
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int error_return=0;
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unsigned char temp;
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,54))
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struct pci_dev *VT596_dev;
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#else
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unsigned char VT596_bus, VT596_devfn;
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int i,res;
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#endif
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/* First check whether we can access PCI at all */
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if (pci_present() == 0) {
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printk("i2c-via2.o: Error: No PCI-bus found!\n");
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error_return=-ENODEV;
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goto END;
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}
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/* Look for the VT596 function 3 _or_ VT686 function 4 */
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,54))
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VT596_dev = NULL;
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VT596_dev = pci_find_device(PCI_VENDOR_ID_VIA,
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PCI_DEVICE_ID_VIA_82C596_3, VT596_dev);
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if (VT596_dev == NULL)
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VT596_dev = pci_find_device(PCI_VENDOR_ID_VIA,
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PCI_DEVICE_ID_VIA_82C686_4, VT596_dev);
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if (VT596_dev == NULL) {
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#else /* LINUX_VERSION_CODE < KERNEL_VERSION(2,1,54) */
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for (i = 0;
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! (res = pcibios_find_device(PCI_VENDOR_ID_VIA,
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PCI_DEVICE_ID_VIA_82C596_3,
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i,&VT596_bus, &VT596_devfn)) &&
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PCI_FUNC(VT596_devfn) != 3;
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i++);
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if (res)
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for (i = 0;
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! (res = pcibios_find_device(PCI_VENDOR_ID_VIA,
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PCI_DEVICE_ID_VIA_82C686_4,
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i,&VT596_bus, &VT596_devfn)) &&
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PCI_FUNC(VT596_devfn) != 4;
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i++);
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if (res) {
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#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,1,54) */
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printk("i2c-via2.o: Error: Can't detect vt82c596 or vt82c686");
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error_return=-ENODEV;
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goto END;
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}
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/* Determine the configuration space registers for the SMBus areas */
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if ((! pci_read_config_word_united(VT596_dev, VT596_bus ,VT596_devfn,
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SMBBA1, &vt596_smba)) && (vt596_smba & 0x1)) {
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smb_cf_base = SMBBA1;
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smb_cf_hstcfg = 0xD2;
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} else if ((! pci_read_config_word_united(VT596_dev, VT596_bus ,VT596_devfn,
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SMBBA2, &vt596_smba)) && (vt596_smba & 0x1)) {
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smb_cf_base = SMBBA2;
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smb_cf_hstcfg = 0x84;
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} else {
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printk("i2c-via2.o: Cannot configure SMBus I/O Base address\n");
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error_return=-ENODEV;
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goto END;
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}
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/* Determine the address of the SMBus areas */
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if (force_addr) {
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vt596_smba = force_addr & 0xfff0;
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force = 0;
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} else {
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vt596_smba &= 0xfff0;
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}
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if (check_region(vt596_smba, 8)) {
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printk("i2c-via2.o: vt82c596_smb region 0x%x already in use!\n", vt596_smba);
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error_return=-ENODEV;
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goto END;
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}
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pci_read_config_byte_united(VT596_dev, VT596_bus, VT596_devfn,
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SMBHSTCFG, &temp);
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/* If force_addr is set, we program the new address here. Just to make
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sure, we disable the VT596 first. */
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if (force_addr) {
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pci_write_config_byte_united(VT596_dev, VT596_bus, VT596_devfn,
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SMBHSTCFG, temp & 0xfe);
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pci_write_config_word_united(VT596_dev, VT596_bus ,VT596_devfn,
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SMBBA,vt596_smba);
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pci_write_config_byte_united(VT596_dev, VT596_bus, VT596_devfn,
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SMBHSTCFG, temp | 0x01);
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printk("i2c-via2.o: WARNING: VT596 SMBus interface set to new "
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"address %04x!\n",vt596_smba);
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} else if ((temp & 1) == 0) {
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if (force) {
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/* NOTE: This assumes I/O space and other allocations WERE
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done by the Bios! Don't complain if your hardware does weird
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things after enabling this. :') Check for Bios updates before
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resorting to this. */
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pci_write_config_byte_united(VT596_dev, VT596_bus, VT596_devfn,
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SMBHSTCFG, temp | 1);
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printk("i2c-via2.o: WARNING: SMBus interface has been FORCEFULLY "
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"ENABLED!\n");
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} else {
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printk("SMBUS: Error: Host SMBus controller not enabled!\n");
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error_return=-ENODEV;
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goto END;
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}
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}
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/* Everything is happy, let's grab the memory and set things up. */
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request_region(vt596_smba, 8, "via2-smbus");
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#ifdef DEBUG
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if ((temp & 0x0E) == 8)
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printk("i2c-via2.o: using Interrupt 9 for SMBus.\n");
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else if ((temp & 0x0E) == 0)
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printk("i2c-via2.o: using Interrupt SMI# for SMBus.\n");
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else
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printk("i2c-via2.o: Illegal Interrupt configuration (or code out "
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"of date)!\n");
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pci_read_config_byte_united(VT596_dev, VT596_bus, VT596_devfn, SMBREV,
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&temp);
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printk("i2c-via2.o: SMBREV = 0x%X\n",temp);
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printk("i2c-via2.o: VT596_smba = 0x%X\n",vt596_smba);
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#endif /* DEBUG */
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END:
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return error_return;
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}
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/* Internally used pause function */
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void vt596_do_pause( unsigned int amount )
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{
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current->state = TASK_INTERRUPTIBLE;
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schedule_timeout(amount);
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}
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/* Another internally used function */
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int vt596_transaction(void)
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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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#ifdef DEBUG
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printk("i2c-via2.o: Transaction (pre): CNT=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, "
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"DAT1=%02x\n",
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inb_p(SMBHSTCNT),inb_p(SMBHSTCMD),inb_p(SMBHSTADD),inb_p(SMBHSTDAT0),
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inb_p(SMBHSTDAT1));
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#endif
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/* Make sure the SMBus host is ready to start transmitting */
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if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
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#ifdef DEBUG
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printk("i2c-via2.o: SMBus busy (%02x). Resetting... \n",temp);
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#endif
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outb_p(temp, SMBHSTSTS);
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if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
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#ifdef DEBUG
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printk("i2c-via2.o: Failed! (%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("i2c-via2.o: Successfull!\n");
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#endif
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}
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}
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/* start the transaction by setting bit 6 */
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outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
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/* We will always wait for a fraction of a second!
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I don't know if VIA needs this, Intel did */
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do {
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vt596_do_pause(1);
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temp=inb_p(SMBHSTSTS);
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} while ((temp & 0x01) && (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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#ifdef DEBUG
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printk("i2c-via2.o: SMBus Timeout!\n");
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result = -1;
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#endif
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}
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|
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if (temp & 0x10) {
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result = -1;
|
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#ifdef DEBUG
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printk("i2c-via2.o: Error: Failed bus transaction\n");
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#endif
|
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}
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if (temp & 0x08) {
|
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result = -1;
|
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printk("i2c-via2.o: Bus collision! SMBus may be locked until next hard
|
||||
reset. (sorry!)\n");
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/* Clock stops and slave is stuck in mid-transmission */
|
||||
}
|
||||
|
||||
if (temp & 0x04) {
|
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result = -1;
|
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#ifdef DEBUG
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printk("i2c-via2.o: Error: no response!\n");
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#endif
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}
|
||||
|
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if (inb_p(SMBHSTSTS) != 0x00)
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outb_p( inb(SMBHSTSTS), SMBHSTSTS);
|
||||
|
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if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
|
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#ifdef DEBUG
|
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printk("i2c-via2.o: Failed reset at end of transaction (%02x)\n",temp);
|
||||
#endif
|
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}
|
||||
#ifdef DEBUG
|
||||
printk("i2c-via2.o: Transaction (post): CNT=%02x, CMD=%02x, ADD=%02x, "
|
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"DAT0=%02x, DAT1=%02x\n",
|
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inb_p(SMBHSTCNT),inb_p(SMBHSTCMD),inb_p(SMBHSTADD),inb_p(SMBHSTDAT0),
|
||||
inb_p(SMBHSTDAT1));
|
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#endif
|
||||
return result;
|
||||
}
|
||||
|
||||
/* Return -1 on error. See smbus.h for more information */
|
||||
s32 vt596_access(struct i2c_adapter *adap, u8 addr, char read_write,
|
||||
u8 command, int size, union i2c_smbus_data * data)
|
||||
{
|
||||
int i,len;
|
||||
|
||||
switch(size) {
|
||||
case I2C_SMBUS_PROC_CALL:
|
||||
printk("i2c-via2.o: I2C_SMBUS_PROC_CALL not supported!\n");
|
||||
return -1;
|
||||
case I2C_SMBUS_QUICK:
|
||||
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD);
|
||||
size = VT596_QUICK;
|
||||
break;
|
||||
case I2C_SMBUS_BYTE:
|
||||
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD);
|
||||
if (read_write == I2C_SMBUS_WRITE)
|
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outb_p(command, SMBHSTCMD);
|
||||
size = VT596_BYTE;
|
||||
break;
|
||||
case I2C_SMBUS_BYTE_DATA:
|
||||
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD);
|
||||
outb_p(command, SMBHSTCMD);
|
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if (read_write == I2C_SMBUS_WRITE)
|
||||
outb_p(data->byte,SMBHSTDAT0);
|
||||
size = VT596_BYTE_DATA;
|
||||
break;
|
||||
case I2C_SMBUS_WORD_DATA:
|
||||
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD);
|
||||
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_BLOCK_DATA:
|
||||
outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), SMBHSTADD);
|
||||
outb_p(command, SMBHSTCMD);
|
||||
if (read_write == I2C_SMBUS_WRITE) {
|
||||
len = data->block[0];
|
||||
if (len < 0)
|
||||
len = 0;
|
||||
if (len > 32)
|
||||
len = 32;
|
||||
outb_p(len,SMBHSTDAT0);
|
||||
i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
|
||||
for (i = 1; i <= len; i ++)
|
||||
outb_p(data->block[i],SMBBLKDAT);
|
||||
}
|
||||
size = VT596_BLOCK_DATA;
|
||||
break;
|
||||
}
|
||||
|
||||
outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
|
||||
|
||||
if (vt596_transaction()) /* Error in transaction */
|
||||
return -1;
|
||||
|
||||
if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK))
|
||||
return 0;
|
||||
|
||||
|
||||
switch(size) {
|
||||
case VT596_BYTE: /* Where is the result put? I assume here it is in
|
||||
SMBHSTDAT0 but it might just as well be in the
|
||||
SMBHSTCMD. No clue in the docs */
|
||||
|
||||
data->byte = inb_p(SMBHSTDAT0);
|
||||
break;
|
||||
case VT596_BYTE_DATA:
|
||||
data->byte = inb_p(SMBHSTDAT0);
|
||||
break;
|
||||
case VT596_WORD_DATA:
|
||||
data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
|
||||
break;
|
||||
case VT596_BLOCK_DATA:
|
||||
data->block[0] = inb_p(SMBHSTDAT0);
|
||||
i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
|
||||
for (i = 1; i <= data->block[0]; i++)
|
||||
data->block[i] = inb_p(SMBBLKDAT);
|
||||
break;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
void vt596_inc(struct i2c_adapter *adapter)
|
||||
{
|
||||
MOD_INC_USE_COUNT;
|
||||
}
|
||||
|
||||
void vt596_dec(struct i2c_adapter *adapter)
|
||||
{
|
||||
|
||||
MOD_DEC_USE_COUNT;
|
||||
}
|
||||
|
||||
int __init i2c_vt596_init(void)
|
||||
{
|
||||
int res;
|
||||
printk("via2.o version %s (%s)\n",LM_VERSION,LM_DATE);
|
||||
#ifdef DEBUG
|
||||
/* PE- It might be good to make this a permanent part of the code! */
|
||||
if (vt596_initialized) {
|
||||
printk("i2c-via2.o: Oops, vt596_init called a second time!\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
#endif
|
||||
vt596_initialized = 0;
|
||||
if ((res = vt596_setup())) {
|
||||
printk("i2c-via2.o: vt82c596 not detected, module not inserted.\n");
|
||||
vt596_cleanup();
|
||||
return res;
|
||||
}
|
||||
vt596_initialized ++;
|
||||
sprintf(vt596_adapter.name,"SMBus vt82c596 adapter at %04x",vt596_smba);
|
||||
if ((res = i2c_add_adapter(&vt596_adapter))) {
|
||||
printk("i2c-via2.o: Adapter registration failed, module not inserted.\n");
|
||||
vt596_cleanup();
|
||||
return res;
|
||||
}
|
||||
vt596_initialized++;
|
||||
printk("i2c-via2.o: vt82c596 bus detected and initialized\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
int __init vt596_cleanup(void)
|
||||
{
|
||||
int res;
|
||||
if (vt596_initialized >= 2)
|
||||
{
|
||||
if ((res = i2c_del_adapter(&vt596_adapter))) {
|
||||
printk("i2c-via2.o: i2c_del_adapter failed, module not removed\n");
|
||||
return res;
|
||||
} else
|
||||
vt596_initialized--;
|
||||
}
|
||||
if (vt596_initialized >= 1) {
|
||||
release_region(vt596_smba, 8);
|
||||
vt596_initialized--;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
EXPORT_NO_SYMBOLS;
|
||||
|
||||
#ifdef MODULE
|
||||
|
||||
MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
|
||||
MODULE_DESCRIPTION("vt82c596 SMBus driver");
|
||||
|
||||
|
||||
int init_module(void)
|
||||
{
|
||||
return i2c_vt596_init();
|
||||
}
|
||||
|
||||
int cleanup_module(void)
|
||||
{
|
||||
return vt596_cleanup();
|
||||
}
|
||||
|
||||
#endif /* MODULE */
|
||||
|
||||
Reference in new issue
Block a user