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// SPDX-License-Identifier: GPL-2.0
/*
* ddbridge-i2c.c: Digital Devices bridge i2c driver
*
* Copyright (C) 2010-2017 Digital Devices GmbH
* Ralph Metzler <rjkm@metzlerbros.de>
* Marcus Metzler <mocm@metzlerbros.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 only, as published by the Free Software Foundation.
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/io.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/timer.h>
#include <linux/i2c.h>
#include <linux/swab.h>
#include <linux/vmalloc.h>
#include "ddbridge.h"
#include "ddbridge-i2c.h"
#include "ddbridge-regs.h"
#include "ddbridge-io.h"
/******************************************************************************/
static int ddb_i2c_cmd(struct ddb_i2c *i2c, u32 adr, u32 cmd)
{
struct ddb *dev = i2c->dev;
unsigned long stat;
u32 val;
ddbwritel(dev, (adr << 9) | cmd, i2c->regs + I2C_COMMAND);
stat = wait_for_completion_timeout(&i2c->completion, HZ);
val = ddbreadl(dev, i2c->regs + I2C_COMMAND);
if (stat == 0) {
dev_err(dev->dev, "I2C timeout, card %d, port %d, link %u\n",
dev->nr, i2c->nr, i2c->link);
{
u32 istat = ddbreadl(dev, INTERRUPT_STATUS);
dev_err(dev->dev, "DDBridge IRS %08x\n", istat);
if (i2c->link) {
u32 listat = ddbreadl(dev,
DDB_LINK_TAG(i2c->link) |
INTERRUPT_STATUS);
dev_err(dev->dev, "DDBridge link %u IRS %08x\n",
i2c->link, listat);
}
if (istat & 1) {
ddbwritel(dev, istat & 1, INTERRUPT_ACK);
} else {
u32 mon = ddbreadl(dev,
i2c->regs + I2C_MONITOR);
dev_err(dev->dev, "I2C cmd=%08x mon=%08x\n",
val, mon);
}
}
return -EIO;
}
val &= 0x70000;
if (val == 0x20000)
dev_err(dev->dev, "I2C bus error\n");
if (val)
return -EIO;
return 0;
}
static int ddb_i2c_master_xfer(struct i2c_adapter *adapter,
struct i2c_msg msg[], int num)
{
struct ddb_i2c *i2c = (struct ddb_i2c *)i2c_get_adapdata(adapter);
struct ddb *dev = i2c->dev;
u8 addr = 0;
addr = msg[0].addr;
if (msg[0].len > i2c->bsize)
return -EIO;
switch (num) {
case 1:
if (msg[0].flags & I2C_M_RD) {
ddbwritel(dev, msg[0].len << 16,
i2c->regs + I2C_TASKLENGTH);
if (ddb_i2c_cmd(i2c, addr, 3))
break;
ddbcpyfrom(dev, msg[0].buf,
i2c->rbuf, msg[0].len);
return num;
}
ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);
ddbwritel(dev, msg[0].len, i2c->regs + I2C_TASKLENGTH);
if (ddb_i2c_cmd(i2c, addr, 2))
break;
return num;
case 2:
if ((msg[0].flags & I2C_M_RD) == I2C_M_RD)
break;
if ((msg[1].flags & I2C_M_RD) != I2C_M_RD)
break;
if (msg[1].len > i2c->bsize)
break;
ddbcpyto(dev, i2c->wbuf, msg[0].buf, msg[0].len);
ddbwritel(dev, msg[0].len | (msg[1].len << 16),
i2c->regs + I2C_TASKLENGTH);
if (ddb_i2c_cmd(i2c, addr, 1))
break;
ddbcpyfrom(dev, msg[1].buf,
i2c->rbuf,
msg[1].len);
return num;
default:
break;
}
return -EIO;
}
static u32 ddb_i2c_functionality(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm ddb_i2c_algo = {
.master_xfer = ddb_i2c_master_xfer,
.functionality = ddb_i2c_functionality,
};
void ddb_i2c_release(struct ddb *dev)
{
int i;
struct ddb_i2c *i2c;
for (i = 0; i < dev->i2c_num; i++) {
i2c = &dev->i2c[i];
i2c_del_adapter(&i2c->adap);
}
}
static void i2c_handler(void *priv)
{
struct ddb_i2c *i2c = (struct ddb_i2c *)priv;
complete(&i2c->completion);
}
static int ddb_i2c_add(struct ddb *dev, struct ddb_i2c *i2c,
const struct ddb_regmap *regmap, int link,
int i, int num)
{
struct i2c_adapter *adap;
i2c->nr = i;
i2c->dev = dev;
i2c->link = link;
i2c->bsize = regmap->i2c_buf->size;
i2c->wbuf = DDB_LINK_TAG(link) |
(regmap->i2c_buf->base + i2c->bsize * i);
i2c->rbuf = i2c->wbuf; /* + i2c->bsize / 2 */
i2c->regs = DDB_LINK_TAG(link) |
(regmap->i2c->base + regmap->i2c->size * i);
ddbwritel(dev, I2C_SPEED_100, i2c->regs + I2C_TIMING);
ddbwritel(dev, ((i2c->rbuf & 0xffff) << 16) | (i2c->wbuf & 0xffff),
i2c->regs + I2C_TASKADDRESS);
init_completion(&i2c->completion);
adap = &i2c->adap;
i2c_set_adapdata(adap, i2c);
#ifdef I2C_ADAP_CLASS_TV_DIGITAL
adap->class = I2C_ADAP_CLASS_TV_DIGITAL | I2C_CLASS_TV_ANALOG;
#else
#ifdef I2C_CLASS_TV_ANALOG
adap->class = I2C_CLASS_TV_ANALOG;
#endif
#endif
snprintf(adap->name, I2C_NAME_SIZE, "ddbridge_%02x.%x.%x",
dev->nr, i2c->link, i);
adap->algo = &ddb_i2c_algo;
adap->algo_data = (void *)i2c;
adap->dev.parent = dev->dev;
return i2c_add_adapter(adap);
}
int ddb_i2c_init(struct ddb *dev)
{
int stat = 0;
u32 i, j, num = 0, l, base;
struct ddb_i2c *i2c;
struct i2c_adapter *adap;
const struct ddb_regmap *regmap;
for (l = 0; l < DDB_MAX_LINK; l++) {
if (!dev->link[l].info)
continue;
regmap = dev->link[l].info->regmap;
if (!regmap || !regmap->i2c)
continue;
base = regmap->irq_base_i2c;
for (i = 0; i < regmap->i2c->num; i++) {
if (!(dev->link[l].info->i2c_mask & (1 << i)))
continue;
i2c = &dev->i2c[num];
ddb_irq_set(dev, l, i + base, i2c_handler, i2c);
stat = ddb_i2c_add(dev, i2c, regmap, l, i, num);
if (stat)
break;
num++;
}
}
if (stat) {
for (j = 0; j < num; j++) {
i2c = &dev->i2c[j];
adap = &i2c->adap;
i2c_del_adapter(adap);
}
} else {
dev->i2c_num = num;
}
return stat;
}
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