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Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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orangepi/linux-orangepi-5.10.y.git/trunk/drivers/i2c/busses/i2c-amd756.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
    Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
 
    Shamelessly ripped from i2c-piix4.c:
 
    Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl> and
    Philip Edelbrock <phil@netroedge.com>
 
*/
 
/*
    2002-04-08: Added nForce support. (Csaba Halasz)
    2002-10-03: Fixed nForce PnP I/O port. (Michael Steil)
    2002-12-28: Rewritten into something that resembles a Linux driver (hch)
    2003-11-29: Added back AMD8111 removed by the previous rewrite.
                (Philip Pokorny)
*/
 
/*
   Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce
   Note: we assume there can only be one device, with one SMBus interface.
*/
 
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/stddef.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/io.h>
 
/* AMD756 SMBus address offsets */
#define SMB_ADDR_OFFSET		0xE0
#define SMB_IOSIZE		16
#define SMB_GLOBAL_STATUS	(0x0 + amd756_ioport)
#define SMB_GLOBAL_ENABLE	(0x2 + amd756_ioport)
#define SMB_HOST_ADDRESS	(0x4 + amd756_ioport)
#define SMB_HOST_DATA		(0x6 + amd756_ioport)
#define SMB_HOST_COMMAND	(0x8 + amd756_ioport)
#define SMB_HOST_BLOCK_DATA	(0x9 + amd756_ioport)
#define SMB_HAS_DATA		(0xA + amd756_ioport)
#define SMB_HAS_DEVICE_ADDRESS	(0xC + amd756_ioport)
#define SMB_HAS_HOST_ADDRESS	(0xE + amd756_ioport)
#define SMB_SNOOP_ADDRESS	(0xF + amd756_ioport)
 
/* PCI Address Constants */
 
/* address of I/O space */
#define SMBBA		0x058		/* mh */
#define SMBBANFORCE	0x014
 
/* general configuration */
#define SMBGCFG		0x041		/* mh */
 
/* silicon revision code */
#define SMBREV		0x008
 
/* Other settings */
#define MAX_TIMEOUT	500
 
/* AMD756 constants */
#define AMD756_QUICK		0x00
#define AMD756_BYTE		0x01
#define AMD756_BYTE_DATA	0x02
#define AMD756_WORD_DATA	0x03
#define AMD756_PROCESS_CALL	0x04
#define AMD756_BLOCK_DATA	0x05
 
static struct pci_driver amd756_driver;
static unsigned short amd756_ioport;
 
/* 
  SMBUS event = I/O 28-29 bit 11
     see E0 for the status bits and enabled in E2
     
*/
#define GS_ABRT_STS	(1 << 0)
#define GS_COL_STS	(1 << 1)
#define GS_PRERR_STS	(1 << 2)
#define GS_HST_STS	(1 << 3)
#define GS_HCYC_STS	(1 << 4)
#define GS_TO_STS	(1 << 5)
#define GS_SMB_STS	(1 << 11)
 
#define GS_CLEAR_STS	(GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \
<------><------><------> GS_HCYC_STS | GS_TO_STS )
 
#define GE_CYC_TYPE_MASK	(7)
#define GE_HOST_STC		(1 << 3)
#define GE_ABORT		(1 << 5)
 
 
static int amd756_transaction(struct i2c_adapter *adap)
{
<------>int temp;
<------>int result = 0;
<------>int timeout = 0;
 
<------>dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
<------><------>"DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
<------><------>inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
<------><------>inb_p(SMB_HOST_DATA));
 
<------>/* Make sure the SMBus host is ready to start transmitting */
<------>if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
<------><------>dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp);
<------><------>do {
<------><------><------>msleep(1);
<------><------><------>temp = inw_p(SMB_GLOBAL_STATUS);
<------><------>} while ((temp & (GS_HST_STS | GS_SMB_STS)) &&
<------><------>         (timeout++ < MAX_TIMEOUT));
<------><------>/* If the SMBus is still busy, we give up */
<------><------>if (timeout > MAX_TIMEOUT) {
<------><------><------>dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp);
<------><------><------>goto abort;
<------><------>}
<------><------>timeout = 0;
<------>}
 
<------>/* start the transaction by setting the start bit */
<------>outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE);
 
<------>/* We will always wait for a fraction of a second! */
<------>do {
<------><------>msleep(1);
<------><------>temp = inw_p(SMB_GLOBAL_STATUS);
<------>} while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT));
 
<------>/* If the SMBus is still busy, we give up */
<------>if (timeout > MAX_TIMEOUT) {
<------><------>dev_dbg(&adap->dev, "Completion timeout!\n");
<------><------>goto abort;
<------>}
 
<------>if (temp & GS_PRERR_STS) {
<------><------>result = -ENXIO;
<------><------>dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n");
<------>}
 
<------>if (temp & GS_COL_STS) {
<------><------>result = -EIO;
<------><------>dev_warn(&adap->dev, "SMBus collision!\n");
<------>}
 
<------>if (temp & GS_TO_STS) {
<------><------>result = -ETIMEDOUT;
<------><------>dev_dbg(&adap->dev, "SMBus protocol timeout!\n");
<------>}
 
<------>if (temp & GS_HCYC_STS)
<------><------>dev_dbg(&adap->dev, "SMBus protocol success!\n");
 
<------>outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
 
#ifdef DEBUG
<------>if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) {
<------><------>dev_dbg(&adap->dev,
<------><------><------>"Failed reset at end of transaction (%04x)\n", temp);
<------>}
#endif
 
<------>dev_dbg(&adap->dev,
<------><------>"Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n",
<------><------>inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE),
<------><------>inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA));
 
<------>return result;
 
 abort:
<------>dev_warn(&adap->dev, "Sending abort\n");
<------>outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
<------>msleep(100);
<------>outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
<------>return -EIO;
}
 
/* Return negative errno on error. */
static s32 amd756_access(struct i2c_adapter * adap, u16 addr,
<------><------>  unsigned short flags, char read_write,
<------><------>  u8 command, int size, union i2c_smbus_data * data)
{
<------>int i, len;
<------>int status;
 
<------>switch (size) {
<------>case I2C_SMBUS_QUICK:
<------><------>outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
<------><------>       SMB_HOST_ADDRESS);
<------><------>size = AMD756_QUICK;
<------><------>break;
<------>case I2C_SMBUS_BYTE:
<------><------>outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
<------><------>       SMB_HOST_ADDRESS);
<------><------>if (read_write == I2C_SMBUS_WRITE)
<------><------><------>outb_p(command, SMB_HOST_DATA);
<------><------>size = AMD756_BYTE;
<------><------>break;
<------>case I2C_SMBUS_BYTE_DATA:
<------><------>outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
<------><------>       SMB_HOST_ADDRESS);
<------><------>outb_p(command, SMB_HOST_COMMAND);
<------><------>if (read_write == I2C_SMBUS_WRITE)
<------><------><------>outw_p(data->byte, SMB_HOST_DATA);
<------><------>size = AMD756_BYTE_DATA;
<------><------>break;
<------>case I2C_SMBUS_WORD_DATA:
<------><------>outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
<------><------>       SMB_HOST_ADDRESS);
<------><------>outb_p(command, SMB_HOST_COMMAND);
<------><------>if (read_write == I2C_SMBUS_WRITE)
<------><------><------>outw_p(data->word, SMB_HOST_DATA);	/* TODO: endian???? */
<------><------>size = AMD756_WORD_DATA;
<------><------>break;
<------>case I2C_SMBUS_BLOCK_DATA:
<------><------>outw_p(((addr & 0x7f) << 1) | (read_write & 0x01),
<------><------>       SMB_HOST_ADDRESS);
<------><------>outb_p(command, SMB_HOST_COMMAND);
<------><------>if (read_write == I2C_SMBUS_WRITE) {
<------><------><------>len = data->block[0];
<------><------><------>if (len < 0)
<------><------><------><------>len = 0;
<------><------><------>if (len > 32)
<------><------><------><------>len = 32;
<------><------><------>outw_p(len, SMB_HOST_DATA);
<------><------><------>/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
<------><------><------>for (i = 1; i <= len; i++)
<------><------><------><------>outb_p(data->block[i],
<------><------><------><------>       SMB_HOST_BLOCK_DATA);
<------><------>}
<------><------>size = AMD756_BLOCK_DATA;
<------><------>break;
<------>default:
<------><------>dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
<------><------>return -EOPNOTSUPP;
<------>}
 
<------>/* How about enabling interrupts... */
<------>outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE);
 
<------>status = amd756_transaction(adap);
<------>if (status)
<------><------>return status;
 
<------>if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK))
<------><------>return 0;
 
 
<------>switch (size) {
<------>case AMD756_BYTE:
<------><------>data->byte = inw_p(SMB_HOST_DATA);
<------><------>break;
<------>case AMD756_BYTE_DATA:
<------><------>data->byte = inw_p(SMB_HOST_DATA);
<------><------>break;
<------>case AMD756_WORD_DATA:
<------><------>data->word = inw_p(SMB_HOST_DATA);	/* TODO: endian???? */
<------><------>break;
<------>case AMD756_BLOCK_DATA:
<------><------>data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f;
<------><------>if(data->block[0] > 32)
<------><------><------>data->block[0] = 32;
<------><------>/* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */
<------><------>for (i = 1; i <= data->block[0]; i++)
<------><------><------>data->block[i] = inb_p(SMB_HOST_BLOCK_DATA);
<------><------>break;
<------>}
 
<------>return 0;
}
 
static u32 amd756_func(struct i2c_adapter *adapter)
{
<------>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 const struct i2c_algorithm smbus_algorithm = {
<------>.smbus_xfer	= amd756_access,
<------>.functionality	= amd756_func,
};
 
struct i2c_adapter amd756_smbus = {
<------>.owner		= THIS_MODULE,
<------>.class          = I2C_CLASS_HWMON | I2C_CLASS_SPD,
<------>.algo		= &smbus_algorithm,
};
 
enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 };
static const char* chipname[] = {
<------>"AMD756", "AMD766", "AMD768",
<------>"nVidia nForce", "AMD8111",
};
 
static const struct pci_device_id amd756_ids[] = {
<------>{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B),
<------>  .driver_data = AMD756 },
<------>{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413),
<------>  .driver_data = AMD766 },
<------>{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443),
<------>  .driver_data = AMD768 },
<------>{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS),
<------>  .driver_data = AMD8111 },
<------>{ PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS),
<------>  .driver_data = NFORCE },
<------>{ 0, }
};
 
MODULE_DEVICE_TABLE (pci, amd756_ids);
 
static int amd756_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
<------>int nforce = (id->driver_data == NFORCE);
<------>int error;
<------>u8 temp;
<------>
<------>if (amd756_ioport) {
<------><------>dev_err(&pdev->dev, "Only one device supported "
<------><------>       "(you have a strange motherboard, btw)\n");
<------><------>return -ENODEV;
<------>}
 
<------>if (nforce) {
<------><------>if (PCI_FUNC(pdev->devfn) != 1)
<------><------><------>return -ENODEV;
 
<------><------>pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport);
<------><------>amd756_ioport &= 0xfffc;
<------>} else { /* amd */
<------><------>if (PCI_FUNC(pdev->devfn) != 3)
<------><------><------>return -ENODEV;
 
<------><------>pci_read_config_byte(pdev, SMBGCFG, &temp);
<------><------>if ((temp & 128) == 0) {
<------><------><------>dev_err(&pdev->dev,
<------><------><------><------>"Error: SMBus controller I/O not enabled!\n");
<------><------><------>return -ENODEV;
<------><------>}
 
<------><------>/* Determine the address of the SMBus areas */
<------><------>/* Technically it is a dword but... */
<------><------>pci_read_config_word(pdev, SMBBA, &amd756_ioport);
<------><------>amd756_ioport &= 0xff00;
<------><------>amd756_ioport += SMB_ADDR_OFFSET;
<------>}
 
<------>error = acpi_check_region(amd756_ioport, SMB_IOSIZE,
<------><------><------><------>  amd756_driver.name);
<------>if (error)
<------><------>return -ENODEV;
 
<------>if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) {
<------><------>dev_err(&pdev->dev, "SMB region 0x%x already in use!\n",
<------><------><------>amd756_ioport);
<------><------>return -ENODEV;
<------>}
 
<------>pci_read_config_byte(pdev, SMBREV, &temp);
<------>dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp);
<------>dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport);
 
<------>/* set up the sysfs linkage to our parent device */
<------>amd756_smbus.dev.parent = &pdev->dev;
 
<------>snprintf(amd756_smbus.name, sizeof(amd756_smbus.name),
<------><------> "SMBus %s adapter at %04x", chipname[id->driver_data],
<------><------> amd756_ioport);
 
<------>error = i2c_add_adapter(&amd756_smbus);
<------>if (error)
<------><------>goto out_err;
 
<------>return 0;
 
 out_err:
<------>release_region(amd756_ioport, SMB_IOSIZE);
<------>return error;
}
 
static void amd756_remove(struct pci_dev *dev)
{
<------>i2c_del_adapter(&amd756_smbus);
<------>release_region(amd756_ioport, SMB_IOSIZE);
}
 
static struct pci_driver amd756_driver = {
<------>.name		= "amd756_smbus",
<------>.id_table	= amd756_ids,
<------>.probe		= amd756_probe,
<------>.remove		= amd756_remove,
};
 
module_pci_driver(amd756_driver);
 
MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver");
MODULE_LICENSE("GPL");
 
EXPORT_SYMBOL(amd756_smbus);
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