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/*
Mantis PCI bridge driver
Copyright (C) 2005, 2006 Manu Abraham (abraham.manu@gmail.com)
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.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <linux/ioport.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include "mantis_common.h"
#define I2C_HW_B_MANTIS 0x1c
static int mantis_ack_wait(struct mantis_pci *mantis)
{
int rc = 0;
u32 timeout = 0;
if (wait_event_interruptible_timeout(mantis->i2c_wq,
mantis->mantis_int_stat & MANTIS_INT_I2CDONE,
msecs_to_jiffies(50)) == -ERESTARTSYS) {
dprintk(verbose, MANTIS_DEBUG, 1, "Master !I2CDONE");
rc = -EREMOTEIO;
}
while (!(mantis->mantis_int_stat & MANTIS_INT_I2CRACK)) {
dprintk(verbose, MANTIS_DEBUG, 1, "Waiting for Slave RACK");
mantis->mantis_int_stat = mmread(MANTIS_INT_STAT);
msleep(5);
timeout++;
if (timeout > 500) {
dprintk(verbose, MANTIS_ERROR, 1, "Slave RACK Fail !");
rc = -EREMOTEIO;
break;
}
}
udelay(350);
return rc;
}
static int mantis_i2c_read(struct mantis_pci *mantis, const struct i2c_msg *msg)
{
u32 rxd, i;
dprintk(verbose, MANTIS_INFO, 0, " %s: Address=[0x%02x] <R>[ ",
__func__, msg->addr);
for (i = 0; i < msg->len; i++) {
rxd = (msg->addr << 25) | (1 << 24)
| MANTIS_I2C_RATE_3
| MANTIS_I2C_STOP
| MANTIS_I2C_PGMODE;
if (i == (msg->len - 1))
rxd &= ~MANTIS_I2C_STOP;
mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
mmwrite(rxd, MANTIS_I2CDATA_CTL);
if (mantis_ack_wait(mantis) != 0) {
dprintk(verbose, MANTIS_DEBUG, 1, "ACK failed<R>");
return -EREMOTEIO;
}
rxd = mmread(MANTIS_I2CDATA_CTL);
msg->buf[i] = (u8)((rxd >> 8) & 0xFF);
dprintk(verbose, MANTIS_INFO, 0, "%02x ", msg->buf[i]);
}
dprintk(verbose, MANTIS_INFO, 0, "]\n");
return 0;
}
static int mantis_i2c_write(struct mantis_pci *mantis, const struct i2c_msg *msg)
{
int i;
u32 txd = 0;
dprintk(verbose, MANTIS_INFO, 0, " %s: Address=[0x%02x] <W>[ ",
__func__, msg->addr);
for (i = 0; i < msg->len; i++) {
dprintk(verbose, MANTIS_INFO, 0, "%02x ", msg->buf[i]);
txd = (msg->addr << 25) | (msg->buf[i] << 8)
| MANTIS_I2C_RATE_3
| MANTIS_I2C_STOP
| MANTIS_I2C_PGMODE;
if (i == (msg->len - 1))
txd &= ~MANTIS_I2C_STOP;
mmwrite(MANTIS_INT_I2CDONE, MANTIS_INT_STAT);
mmwrite(txd, MANTIS_I2CDATA_CTL);
if (mantis_ack_wait(mantis) != 0) {
dprintk(verbose, MANTIS_DEBUG, 1, "ACK failed<W>");
return -EREMOTEIO;
}
}
dprintk(verbose, MANTIS_INFO, 0, "]\n");
return 0;
}
static int mantis_i2c_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num)
{
int ret = 0, i;
struct mantis_pci *mantis;
mantis = i2c_get_adapdata(adapter);
mutex_lock(&mantis->i2c_lock);
for (i = 0; i < num; i++) {
if (msgs[i].flags & I2C_M_RD)
ret = mantis_i2c_read(mantis, &msgs[i]);
else
ret = mantis_i2c_write(mantis, &msgs[i]);
if (ret < 0)
return ret;
}
mutex_unlock(&mantis->i2c_lock);
return num;
}
static u32 mantis_i2c_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_EMUL;
}
static struct i2c_algorithm mantis_algo = {
.master_xfer = mantis_i2c_xfer,
.functionality = mantis_i2c_func,
};
static struct i2c_adapter mantis_i2c_adapter = {
.owner = THIS_MODULE,
.name = "Mantis I2C",
.id = I2C_HW_B_MANTIS,
.class = I2C_CLASS_TV_DIGITAL,
.algo = &mantis_algo,
};
int __devinit mantis_i2c_init(struct mantis_pci *mantis)
{
u32 intstat, intmask;
mutex_init(&mantis->i2c_lock);
memcpy(&mantis->adapter, &mantis_i2c_adapter, sizeof (mantis_i2c_adapter));
i2c_set_adapdata(&mantis->adapter, mantis);
mantis->i2c_rc = i2c_add_adapter(&mantis->adapter);
if (mantis->i2c_rc < 0)
return mantis->i2c_rc;
dprintk(verbose, MANTIS_DEBUG, 1, "Initializing I2C ..");
intstat = mmread(MANTIS_INT_STAT);
intmask = mmread(MANTIS_INT_MASK);
mmwrite(intstat, MANTIS_INT_STAT);
mmwrite(intmask | MANTIS_INT_I2CDONE, MANTIS_INT_MASK);
dprintk(verbose, MANTIS_DEBUG, 1, "[0x%08x/%08x]", intstat, intmask);
return 0;
}
int __devexit mantis_i2c_exit(struct mantis_pci *mantis)
{
dprintk(verbose, MANTIS_DEBUG, 1, "Removing I2C adapter");
return i2c_del_adapter(&mantis->adapter);
}
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