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Commit f66a7c41 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Linus Torvalds
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[PATCH] rewrite i2c-amd756 to resemble a linux driver 

This is a large rewrite of i2c-amd756 (added by Pavel post 2.5.53
although it's not his code) into a driver following linux driver
guide lines.  As a side-effect it shrinks the driver by almost one
fifth.  Tested with an early AMD756-based board.

 - use proper PCI API
 - use pr_debug instead of #ifdef DEBUG mess
 - use named initializers
 - completly restructure init/exit code
 - mark everything static
parent 7b106d88
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Showing with 152 additions and 243 deletions
drivers/i2c/busses/i2c-amd756.c
View file @ f66a7c41
......@@ -27,6 +27,7 @@
/*
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)
*/
/*
......@@ -37,43 +38,29 @@
#include <linux/version.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <asm/io.h>
struct sd {
const unsigned short vendor;
const unsigned short device;
const unsigned short function;
const char* name;
int amdsetup:1;
};
static struct sd supported[] = {
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B, 3, "AMD756", 1},
{PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413, 3, "AMD766", 1},
{PCI_VENDOR_ID_AMD, 0x7443, 3, "AMD768", 1},
{PCI_VENDOR_ID_NVIDIA, 0x01B4, 1, "nVidia nForce", 0},
{0, 0, 0}
};
#define DRV_NAME "i2c-amd756"
/* AMD756 SMBus address offsets */
#define SMB_ADDR_OFFSET 0xE0
#define SMB_IOSIZE 16
#define SMB_GLOBAL_STATUS (0x0 + amd756_smba)
#define SMB_GLOBAL_ENABLE (0x2 + amd756_smba)
#define SMB_HOST_ADDRESS (0x4 + amd756_smba)
#define SMB_HOST_DATA (0x6 + amd756_smba)
#define SMB_HOST_COMMAND (0x8 + amd756_smba)
#define SMB_HOST_BLOCK_DATA (0x9 + amd756_smba)
#define SMB_HAS_DATA (0xA + amd756_smba)
#define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_smba)
#define SMB_HAS_HOST_ADDRESS (0xE + amd756_smba)
#define SMB_SNOOP_ADDRESS (0xF + amd756_smba)
#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 */
......@@ -98,120 +85,8 @@ static struct sd supported[] = {
#define AMD756_PROCESS_CALL 0x04
#define AMD756_BLOCK_DATA 0x05
/* insmod parameters */
int __init i2c_amd756_init(void);
void __exit i2c_amd756_exit(void);
static int amd756_cleanup(void);
static int amd756_setup(void);
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);
static void amd756_do_pause(unsigned int amount);
static void amd756_abort(void);
static int amd756_transaction(void);
static void amd756_inc(struct i2c_adapter *adapter);
static void amd756_dec(struct i2c_adapter *adapter);
static u32 amd756_func(struct i2c_adapter *adapter);
static struct i2c_algorithm smbus_algorithm = {
/* name */ "Non-I2C SMBus adapter",
/* id */ I2C_ALGO_SMBUS,
/* master_xfer */ NULL,
/* smbus_access */ amd756_access,
/* slave;_send */ NULL,
/* slave_rcv */ NULL,
/* algo_control */ NULL,
/* functionality */ amd756_func,
};
static struct i2c_adapter amd756_adapter = {
"unset",
I2C_ALGO_SMBUS | I2C_HW_SMBUS_AMD756,
&smbus_algorithm,
NULL,
amd756_inc,
amd756_dec,
NULL,
NULL,
};
static int __initdata amd756_initialized;
static struct sd *amd756_sd = NULL;
static unsigned short amd756_smba = 0;
int amd756_setup(void)
{
unsigned char temp;
struct sd *currdev;
struct pci_dev *AMD756_dev = NULL;
if (pci_present() == 0) {
return -ENODEV;
}
/* Look for a supported chip */
for(currdev = supported; currdev->vendor; ) {
AMD756_dev = pci_find_device(currdev->vendor,
currdev->device, AMD756_dev);
if (AMD756_dev != NULL) {
if (PCI_FUNC(AMD756_dev->devfn) == currdev->function)
break;
} else {
currdev++;
}
}
if (AMD756_dev == NULL) {
printk
("i2c-amd756.o: Error: No AMD756 or compatible device detected!\n");
return -ENODEV;
}
printk(KERN_INFO "i2c-amd756.o: Found %s SMBus controller.\n", currdev->name);
if (currdev->amdsetup)
{
pci_read_config_byte(AMD756_dev, SMBGCFG, &temp);
if ((temp & 128) == 0) {
printk("i2c-amd756.o: 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(AMD756_dev, SMBBA, &amd756_smba);
amd756_smba &= 0xff00;
amd756_smba += SMB_ADDR_OFFSET;
} else {
pci_read_config_word(AMD756_dev, SMBBANFORCE, &amd756_smba);
amd756_smba &= 0xfffc;
}
if(amd756_smba == 0) {
printk(KERN_ERR "i2c-amd756.o: Error: SMB base address uninitialized\n");
return -ENODEV;
}
if (check_region(amd756_smba, SMB_IOSIZE)) {
printk
("i2c-amd756.o: SMB region 0x%x already in use!\n",
amd756_smba);
return -ENODEV;
}
/* Everything is happy, let's grab the memory and set things up. */
request_region(amd756_smba, SMB_IOSIZE, "amd756-smbus");
#ifdef DEBUG
pci_read_config_byte(AMD756_dev, SMBREV, &temp);
printk("i2c-amd756.o: SMBREV = 0x%X\n", temp);
printk("i2c-amd756.o: AMD756_smba = 0x%X\n", amd756_smba);
#endif /* DEBUG */
/* store struct sd * for future reference */
amd756_sd = currdev;
return 0;
}
static unsigned short amd756_ioport = 0;
/*
SMBUS event = I/O 28-29 bit 11
......@@ -220,7 +95,7 @@ int amd756_setup(void)
*/
/* Internally used pause function */
void amd756_do_pause(unsigned int amount)
static void amd756_do_pause(unsigned int amount)
{
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(amount);
......@@ -241,33 +116,21 @@ void amd756_do_pause(unsigned int amount)
#define GE_HOST_STC (1 << 3)
#define GE_ABORT (1 << 5)
void amd756_abort(void)
{
printk("i2c-amd756.o: Sending abort.\n");
outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
amd756_do_pause(100);
outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
}
int amd756_transaction(void)
static int amd756_transaction(void)
{
int temp;
int result = 0;
int timeout = 0;
#ifdef DEBUG
printk
("i2c-amd756.o: 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));
#endif
pr_debug(DRV_NAME
": 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)) {
#ifdef DEBUG
printk
("i2c-amd756.o: SMBus busy (%04x). Waiting... \n", temp);
#endif
pr_debug(DRV_NAME ": SMBus busy (%04x). Waiting... \n", temp);
do {
amd756_do_pause(1);
temp = inw_p(SMB_GLOBAL_STATUS);
......@@ -275,9 +138,8 @@ int amd756_transaction(void)
(timeout++ < MAX_TIMEOUT));
/* If the SMBus is still busy, we give up */
if (timeout >= MAX_TIMEOUT) {
printk("i2c-amd756.o: Busy wait timeout! (%04x)\n", temp);
amd756_abort();
return -1;
pr_debug(DRV_NAME ": Busy wait timeout (%04x)\n", temp);
goto abort;
}
timeout = 0;
}
......@@ -293,64 +155,63 @@ int amd756_transaction(void)
/* If the SMBus is still busy, we give up */
if (timeout >= MAX_TIMEOUT) {
printk("i2c-amd756.o: Completion timeout!\n");
amd756_abort ();
return -1;
pr_debug(DRV_NAME ": Completion timeout!\n");
goto abort;
}
if (temp & GS_PRERR_STS) {
result = -1;
#ifdef DEBUG
printk("i2c-amd756.o: SMBus Protocol error (no response)!\n");
#endif
pr_debug(DRV_NAME ": SMBus Protocol error (no response)!\n");
}
if (temp & GS_COL_STS) {
result = -1;
printk("i2c-amd756.o: SMBus collision!\n");
printk(KERN_WARNING DRV_NAME " SMBus collision!\n");
}
if (temp & GS_TO_STS) {
result = -1;
#ifdef DEBUG
printk("i2c-amd756.o: SMBus protocol timeout!\n");
#endif
}
#ifdef DEBUG
if (temp & GS_HCYC_STS) {
printk("i2c-amd756.o: SMBus protocol success!\n");
pr_debug(DRV_NAME ": SMBus protocol timeout!\n");
}
#endif
if (temp & GS_HCYC_STS)
pr_debug(DRV_NAME " 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) {
printk
("i2c-amd756.o: Failed reset at end of transaction (%04x)\n",
temp);
pr_debug(DRV_NAME
": Failed reset at end of transaction (%04x)\n", temp);
}
printk
("i2c-amd756.o: 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));
pr_debug(DRV_NAME
": 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));
#endif
return result;
abort:
printk(KERN_WARNING DRV_NAME ": Sending abort.\n");
outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE);
amd756_do_pause(100);
outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS);
return -1;
}
/* Return -1 on error. */
s32 amd756_access(struct i2c_adapter * adap, u16 addr,
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;
/** TODO: Should I supporte the 10-bit transfers? */
/** TODO: Should I supporte the 10-bit transfers? */
switch (size) {
case I2C_SMBUS_PROC_CALL:
printk
("i2c-amd756.o: I2C_SMBUS_PROC_CALL not supported!\n");
pr_debug(DRV_NAME ": I2C_SMBUS_PROC_CALL not supported!\n");
/* TODO: Well... It is supported, I'm just not sure what to do here... */
return -1;
case I2C_SMBUS_QUICK:
......@@ -435,92 +296,140 @@ s32 amd756_access(struct i2c_adapter * adap, u16 addr,
return 0;
}
void amd756_inc(struct i2c_adapter *adapter)
static void amd756_inc(struct i2c_adapter *adapter)
{
MOD_INC_USE_COUNT;
}
void amd756_dec(struct i2c_adapter *adapter)
static void amd756_dec(struct i2c_adapter *adapter)
{
MOD_DEC_USE_COUNT;
}
u32 amd756_func(struct i2c_adapter *adapter)
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 | I2C_FUNC_SMBUS_PROC_CALL;
}
int __init i2c_amd756_init(void)
static struct i2c_algorithm smbus_algorithm = {
.name = "Non-I2C SMBus adapter",
.id = I2C_ALGO_SMBUS,
.smbus_xfer = amd756_access,
.functionality = amd756_func,
};
static struct i2c_adapter amd756_adapter = {
.name = "unset",
.id = I2C_ALGO_SMBUS | I2C_HW_SMBUS_AMD756,
.algo = &smbus_algorithm,
.inc_use = amd756_inc,
.dec_use = amd756_dec,
};
enum chiptype { AMD756, AMD766, AMD768, NFORCE };
static struct pci_device_id amd756_ids[] __devinitdata = {
{PCI_VENDOR_ID_AMD, 0x740B, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD756 },
{PCI_VENDOR_ID_AMD, 0x7413, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD766 },
{PCI_VENDOR_ID_AMD, 0x7443, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AMD768 },
{PCI_VENDOR_ID_NVIDIA, 0x01B4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, NFORCE },
{ 0, }
};
static int __devinit amd756_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int res;
#ifdef DEBUG
/* PE- It might be good to make this a permanent part of the code! */
if (amd756_initialized) {
printk
("i2c-amd756.o: Oops, amd756_init called a second time!\n");
return -EBUSY;
int nforce = (id->driver_data == NFORCE), error;
u8 temp;
if (amd756_ioport) {
printk(KERN_ERR DRV_NAME ": Only one device supported. "
"(you have a strange motherboard, btw..)\n");
return -ENODEV;
}
#endif
amd756_initialized = 0;
if ((res = amd756_setup())) {
printk
("i2c-amd756.o: AMD756 or compatible device not detected, module not inserted.\n");
amd756_cleanup();
return res;
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) {
printk(KERN_ERR DRV_NAME
": 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;
}
amd756_initialized++;
sprintf(amd756_adapter.name, "SMBus %s adapter at %04x",
amd756_sd->name, amd756_smba);
if ((res = i2c_add_adapter(&amd756_adapter))) {
printk
("i2c-amd756.o: Adapter registration failed, module not inserted.\n");
amd756_cleanup();
return res;
if (!request_region(amd756_ioport, SMB_IOSIZE, "amd756-smbus")) {
printk(KERN_ERR DRV_NAME
": SMB region 0x%x already in use!\n", amd756_ioport);
return -ENODEV;
}
amd756_initialized++;
printk("i2c-amd756.o: %s bus detected and initialized\n",
amd756_sd->name);
#ifdef DEBUG
pci_read_config_byte(pdev, SMBREV, &temp);
printk(KERN_DEBUG DRV_NAME ": SMBREV = 0x%X\n", temp);
printk(KERN_DEBUG DRV_NAME ": AMD756_smba = 0x%X\n", amd756_ioport);
#endif
sprintf(amd756_adapter.name,
"SMBus AMD75x adapter at %04x", amd756_ioport);
error = i2c_add_adapter(&amd756_adapter);
if (error) {
printk(KERN_ERR DRV_NAME
": Adapter registration failed, module not inserted.\n");
goto out_err;
}
return 0;
out_err:
release_region(amd756_ioport, SMB_IOSIZE);
return error;
}
void __exit i2c_amd756_exit(void)
static void __devexit amd756_remove(struct pci_dev *dev)
{
amd756_cleanup();
i2c_del_adapter(&amd756_adapter);
release_region(amd756_ioport, SMB_IOSIZE);
}
static int amd756_cleanup(void)
static struct pci_driver amd756_driver = {
.name = "amd75x smbus",
.id_table = amd756_ids,
.probe = amd756_probe,
.remove = __devexit_p(amd756_remove),
};
static int __init amd756_init(void)
{
int res;
if (amd756_initialized >= 2) {
if ((res = i2c_del_adapter(&amd756_adapter))) {
printk
("i2c-amd756.o: i2c_del_adapter failed, module not removed\n");
return res;
} else
amd756_initialized--;
}
if (amd756_initialized >= 1) {
release_region(amd756_smba, SMB_IOSIZE);
amd756_initialized--;
}
return 0;
return pci_module_init(&amd756_driver);
}
EXPORT_NO_SYMBOLS;
#ifdef MODULE
static void __exit amd756_exit(void)
{
pci_unregister_driver(&amd756_driver);
}
MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>");
MODULE_DESCRIPTION("AMD756/766/768/nVidia nForce SMBus driver");
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
#endif /* MODULE */
module_init(i2c_amd756_init)
module_exit(i2c_amd756_exit)
module_init(amd756_init)
module_exit(amd756_exit)
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