mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-21 11:39:31 +00:00
Jean Delvare
86b9b4a477
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2191 7894878c-1315-0410-8ee3-d5d059ff63e0
155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/*
|
|
i2c-tsunami.c - Part of lm_sensors, Linux kernel modules for hardware
|
|
monitoring
|
|
Copyright (c) 2001 Oleg Vdovikin <vdovikin@jscc.ru>
|
|
|
|
Based on code written by Ralph Metzler <rjkm@thp.uni-koeln.de> and
|
|
Simon Vogl
|
|
|
|
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.
|
|
*/
|
|
|
|
/* This interfaces to the I2C bus of the Tsunami/Typhoon 21272 chipsets
|
|
to gain access to the on-board I2C devices.
|
|
|
|
For more information refer to Compaq's
|
|
"Tsunami/Typhoon 21272 Chipset Hardware Reference Manual"
|
|
Order Number: DS-0025-TE
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/i2c-algo-bit.h>
|
|
#include <linux/init.h>
|
|
#include <asm/io.h>
|
|
#include <asm/hwrpb.h>
|
|
#include <asm/core_tsunami.h>
|
|
#include "version.h"
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* Memory Presence Detect Register (MPD-RW) bits
|
|
with except of reserved RAZ bits */
|
|
|
|
#define MPD_DR 0x8 /* Data receive - RO */
|
|
#define MPD_CKR 0x4 /* Clock receive - RO */
|
|
#define MPD_DS 0x2 /* Data send - Must be a 1 to receive - WO */
|
|
#define MPD_CKS 0x1 /* Clock send - WO */
|
|
|
|
static inline void writempd(unsigned long value)
|
|
{
|
|
TSUNAMI_cchip->mpd.csr = value;
|
|
mb();
|
|
}
|
|
|
|
static inline unsigned long readmpd(void)
|
|
{
|
|
return TSUNAMI_cchip->mpd.csr;
|
|
}
|
|
|
|
static void bit_tsunami_setscl(void *data, int val)
|
|
{
|
|
/* read currently setted bits to modify them */
|
|
unsigned long bits = readmpd() >> 2; /* assume output == input */
|
|
|
|
if (val)
|
|
bits |= MPD_CKS;
|
|
else
|
|
bits &= ~MPD_CKS;
|
|
|
|
writempd(bits);
|
|
}
|
|
|
|
static void bit_tsunami_setsda(void *data, int val)
|
|
{
|
|
/* read currently setted bits to modify them */
|
|
unsigned long bits = readmpd() >> 2; /* assume output == input */
|
|
|
|
if (val)
|
|
bits |= MPD_DS;
|
|
else
|
|
bits &= ~MPD_DS;
|
|
|
|
writempd(bits);
|
|
}
|
|
|
|
/* The MPD pins are open drain, so the pins always remain outputs.
|
|
We rely on the i2c-algo-bit routines to set the pins high before
|
|
reading the input from other chips. */
|
|
|
|
static int bit_tsunami_getscl(void *data)
|
|
{
|
|
return (0 != (readmpd() & MPD_CKR));
|
|
}
|
|
|
|
static int bit_tsunami_getsda(void *data)
|
|
{
|
|
return (0 != (readmpd() & MPD_DR));
|
|
}
|
|
|
|
static struct i2c_algo_bit_data tsunami_i2c_bit_data = {
|
|
.setsda = bit_tsunami_setsda,
|
|
.setscl = bit_tsunami_setscl,
|
|
.getsda = bit_tsunami_getsda,
|
|
.getscl = bit_tsunami_getscl,
|
|
.udelay = 10,
|
|
.mdelay = 10,
|
|
.timeout = HZ/2
|
|
};
|
|
|
|
static struct i2c_adapter tsunami_i2c_adapter = {
|
|
.owner = THIS_MODULE,
|
|
.name = "I2C Tsunami/Typhoon adapter",
|
|
.id = I2C_HW_B_TSUNA,
|
|
.algo_data = &tsunami_i2c_bit_data,
|
|
};
|
|
|
|
|
|
#if 0
|
|
static struct pci_driver tsunami_driver = {
|
|
.name = "tsunami smbus",
|
|
.id_table = tsunami_ids,
|
|
.probe = tsunami_probe,
|
|
.remove = __devexit_p(tsunami_remove),
|
|
};
|
|
#endif
|
|
|
|
static int __init i2c_tsunami_init(void)
|
|
{
|
|
printk("i2c-tsunami.o version %s (%s)\n", LM_VERSION, LM_DATE);
|
|
|
|
if (hwrpb->sys_type != ST_DEC_TSUNAMI) {
|
|
printk("i2c-tsunami.o: not Tsunami based system (%ld), module not inserted.\n", hwrpb->sys_type);
|
|
return -ENXIO;
|
|
} else {
|
|
printk("i2c-tsunami.o: using Cchip MPD at 0x%lx.\n", (long) &TSUNAMI_cchip->mpd);
|
|
}
|
|
return i2c_bit_add_bus(&tsunami_i2c_adapter);
|
|
}
|
|
|
|
|
|
static void __exit i2c_tsunami_exit(void)
|
|
{
|
|
i2c_bit_del_bus(&tsunami_i2c_adapter);
|
|
}
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Oleg I. Vdovikin <vdovikin@jscc.ru>");
|
|
MODULE_DESCRIPTION("Tsunami I2C/SMBus driver");
|
|
|
|
module_init(i2c_tsunami_init);
|
|
module_exit(i2c_tsunami_exit);
|