hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
linux-sg2042/drivers/i2c/busses/i2c-ali1563.c

444 lines
11 KiB
C
Raw Blame History

/**
* i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
*
* Copyright (C) 2004 Patrick Mochel
* 2005 Rudolf Marek <r.marek@assembler.cz>
*
* The 1563 southbridge is deceptively similar to the 1533, with a
* few notable exceptions. One of those happens to be the fact they
* upgraded the i2c core to be 2.0 compliant, and happens to be almost
* identical to the i2c controller found in the Intel 801 south
* bridges.
*
* This driver is based on a mix of the 15x3, 1535, and i801 drivers,
* with a little help from the ALi 1563 spec.
*
* This file is released under the GPLv2
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#define ALI1563_MAX_TIMEOUT 500
#define ALI1563_SMBBA 0x80
#define ALI1563_SMB_IOEN 1
#define ALI1563_SMB_HOSTEN 2
#define ALI1563_SMB_IOSIZE 16
#define SMB_HST_STS (ali1563_smba + 0)
#define SMB_HST_CNTL1 (ali1563_smba + 1)
#define SMB_HST_CNTL2 (ali1563_smba + 2)
#define SMB_HST_CMD (ali1563_smba + 3)
#define SMB_HST_ADD (ali1563_smba + 4)
#define SMB_HST_DAT0 (ali1563_smba + 5)
#define SMB_HST_DAT1 (ali1563_smba + 6)
#define SMB_BLK_DAT (ali1563_smba + 7)
#define HST_STS_BUSY 0x01
#define HST_STS_INTR 0x02
#define HST_STS_DEVERR 0x04
#define HST_STS_BUSERR 0x08
#define HST_STS_FAIL 0x10
#define HST_STS_DONE 0x80
#define HST_STS_BAD 0x1c
#define HST_CNTL1_TIMEOUT 0x80
#define HST_CNTL1_LAST 0x40
#define HST_CNTL2_KILL 0x04
#define HST_CNTL2_START 0x40
#define HST_CNTL2_QUICK 0x00
#define HST_CNTL2_BYTE 0x01
#define HST_CNTL2_BYTE_DATA 0x02
#define HST_CNTL2_WORD_DATA 0x03
#define HST_CNTL2_BLOCK 0x05
#define HST_CNTL2_SIZEMASK 0x38
static struct pci_driver ali1563_pci_driver;
static unsigned short ali1563_smba;
static int ali1563_transaction(struct i2c_adapter *a, int size)
{
u32 data;
int timeout;
int status = -EIO;
dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
inb_p(SMB_HST_DAT1));
data = inb_p(SMB_HST_STS);
if (data & HST_STS_BAD) {
dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
outb_p(data | HST_STS_BAD, SMB_HST_STS);
data = inb_p(SMB_HST_STS);
if (data & HST_STS_BAD)
return -EBUSY;
}
outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
timeout = ALI1563_MAX_TIMEOUT;
do {
msleep(1);
} while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
inb_p(SMB_HST_DAT1));
if (timeout && !(data & HST_STS_BAD))
return 0;
if (!timeout) {
dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
/* Issue 'kill' to host controller */
outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
data = inb_p(SMB_HST_STS);
status = -ETIMEDOUT;
}
/* device error - no response, ignore the autodetection case */
if (data & HST_STS_DEVERR) {
if (size != HST_CNTL2_QUICK)
dev_err(&a->dev, "Device error!\n");
status = -ENXIO;
}
/* bus collision */
if (data & HST_STS_BUSERR) {
dev_err(&a->dev, "Bus collision!\n");
/* Issue timeout, hoping it helps */
outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
}
if (data & HST_STS_FAIL) {
dev_err(&a->dev, "Cleaning fail after KILL!\n");
outb_p(0x0, SMB_HST_CNTL2);
}
return status;
}
static int ali1563_block_start(struct i2c_adapter *a)
{
u32 data;
int timeout;
int status = -EIO;
dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
inb_p(SMB_HST_DAT1));
data = inb_p(SMB_HST_STS);
if (data & HST_STS_BAD) {
dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
outb_p(data | HST_STS_BAD, SMB_HST_STS);
data = inb_p(SMB_HST_STS);
if (data & HST_STS_BAD)
return -EBUSY;
}
/* Clear byte-ready bit */
outb_p(data | HST_STS_DONE, SMB_HST_STS);
/* Start transaction and wait for byte-ready bit to be set */
outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
timeout = ALI1563_MAX_TIMEOUT;
do {
msleep(1);
} while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
"CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
inb_p(SMB_HST_DAT1));
if (timeout && !(data & HST_STS_BAD))
return 0;
if (timeout == 0)
status = -ETIMEDOUT;
if (data & HST_STS_DEVERR)
status = -ENXIO;
dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
timeout ? "" : "Timeout ",
data & HST_STS_FAIL ? "Transaction Failed " : "",
data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
data & HST_STS_DEVERR ? "Device Error " : "",
!(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
return status;
}
static int ali1563_block(struct i2c_adapter *a,
union i2c_smbus_data *data, u8 rw)
{
int i, len;
int error = 0;
/* Do we need this? */
outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
if (rw == I2C_SMBUS_WRITE) {
len = data->block[0];
if (len < 1)
len = 1;
else if (len > 32)
len = 32;
outb_p(len, SMB_HST_DAT0);
outb_p(data->block[1], SMB_BLK_DAT);
} else
len = 32;
outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
for (i = 0; i < len; i++) {
if (rw == I2C_SMBUS_WRITE) {
outb_p(data->block[i + 1], SMB_BLK_DAT);
error = ali1563_block_start(a);
if (error)
break;
} else {
error = ali1563_block_start(a);
if (error)
break;
if (i == 0) {
len = inb_p(SMB_HST_DAT0);
if (len < 1)
len = 1;
else if (len > 32)
len = 32;
}
data->block[i+1] = inb_p(SMB_BLK_DAT);
}
}
/* Do we need this? */
outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
return error;
}
static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
unsigned short flags, char rw, u8 cmd,
int size, union i2c_smbus_data *data)
{
int error = 0;
int timeout;
u32 reg;
for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
reg = inb_p(SMB_HST_STS);
if (!(reg & HST_STS_BUSY))
break;
}
if (!timeout)
dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
outb_p(0xff, SMB_HST_STS);
/* Map the size to what the chip understands */
switch (size) {
case I2C_SMBUS_QUICK:
size = HST_CNTL2_QUICK;
break;
case I2C_SMBUS_BYTE:
size = HST_CNTL2_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
size = HST_CNTL2_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
size = HST_CNTL2_WORD_DATA;
break;
case I2C_SMBUS_BLOCK_DATA:
size = HST_CNTL2_BLOCK;
break;
default:
dev_warn(&a->dev, "Unsupported transaction %d\n", size);
error = -EOPNOTSUPP;
goto Done;
}
outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) |
(size << 3), SMB_HST_CNTL2);
/* Write the command register */
switch (size) {
case HST_CNTL2_BYTE:
if (rw == I2C_SMBUS_WRITE)
/* Beware it uses DAT0 register and not CMD! */
outb_p(cmd, SMB_HST_DAT0);
break;
case HST_CNTL2_BYTE_DATA:
outb_p(cmd, SMB_HST_CMD);
if (rw == I2C_SMBUS_WRITE)
outb_p(data->byte, SMB_HST_DAT0);
break;
case HST_CNTL2_WORD_DATA:
outb_p(cmd, SMB_HST_CMD);
if (rw == I2C_SMBUS_WRITE) {
outb_p(data->word & 0xff, SMB_HST_DAT0);
outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
}
break;
case HST_CNTL2_BLOCK:
outb_p(cmd, SMB_HST_CMD);
error = ali1563_block(a, data, rw);
goto Done;
}
error = ali1563_transaction(a, size);
if (error)
goto Done;
if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
goto Done;
switch (size) {
case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
data->byte = inb_p(SMB_HST_DAT0);
break;
case HST_CNTL2_BYTE_DATA:
data->byte = inb_p(SMB_HST_DAT0);
break;
case HST_CNTL2_WORD_DATA:
data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
break;
}
Done:
return error;
}
static u32 ali1563_func(struct i2c_adapter *a)
{
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
I2C_FUNC_SMBUS_BLOCK_DATA;
}
static int ali1563_setup(struct pci_dev *dev)
{
u16 ctrl;
pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
/* SMB I/O Base in high 12 bits and must be aligned with the
* size of the I/O space. */
ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
if (!ali1563_smba) {
dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
goto Err;
}
/* Check if device is enabled */
if (!(ctrl & ALI1563_SMB_HOSTEN)) {
dev_warn(&dev->dev, "Host Controller not enabled\n");
goto Err;
}
if (!(ctrl & ALI1563_SMB_IOEN)) {
dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
pci_write_config_word(dev, ALI1563_SMBBA,
ctrl | ALI1563_SMB_IOEN);
pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
if (!(ctrl & ALI1563_SMB_IOEN)) {
dev_err(&dev->dev,
"I/O space still not enabled, giving up\n");
goto Err;
}
}
if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
ali1563_pci_driver.name))
goto Err;
if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
ali1563_pci_driver.name)) {
dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
ali1563_smba);
goto Err;
}
dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
return 0;
Err:
return -ENODEV;
}
static void ali1563_shutdown(struct pci_dev *dev)
{
release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
}
static const struct i2c_algorithm ali1563_algorithm = {
.smbus_xfer = ali1563_access,
.functionality = ali1563_func,
};
static struct i2c_adapter ali1563_adapter = {
.owner = THIS_MODULE,
.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
.algo = &ali1563_algorithm,
};
static int ali1563_probe(struct pci_dev *dev,
const struct pci_device_id *id_table)
{
int error;
error = ali1563_setup(dev);
if (error)
goto exit;
ali1563_adapter.dev.parent = &dev->dev;
snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
"SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
error = i2c_add_adapter(&ali1563_adapter);
if (error)
goto exit_shutdown;
return 0;
exit_shutdown:
ali1563_shutdown(dev);
exit:
dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
return error;
}
static void ali1563_remove(struct pci_dev *dev)
{
i2c_del_adapter(&ali1563_adapter);
ali1563_shutdown(dev);
}
static const struct pci_device_id ali1563_id_table[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
{},
};
MODULE_DEVICE_TABLE(pci, ali1563_id_table);
static struct pci_driver ali1563_pci_driver = {
.name = "ali1563_smbus",
.id_table = ali1563_id_table,
.probe = ali1563_probe,
.remove = ali1563_remove,
};
module_pci_driver(ali1563_pci_driver);
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink