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
--- 1.1/drivers/i2c/busses/i2c-amd756.c Sun Dec 1 19:47:11 2002
+++ edited/drivers/i2c/busses/i2c-amd756.c Sun Dec 29 20:11:50 2002
@@ -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 @@
#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 @@
*/
/* 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 @@
#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 @@
(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 @@
/* 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);
- }
- 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
+ ": Failed reset at end of transaction (%04x)\n", temp);
+ }
+
+ 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 @@
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;
+ }
+
+ 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;
+ }
+
+ 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;
}
+
+#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
- 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;
- }
- 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;
- }
- amd756_initialized++;
- printk("i2c-amd756.o: %s bus detected and initialized\n",
- amd756_sd->name);
+
+ 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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This archive was generated by hypermail 2b29 : Tue Dec 31 2002 - 22:00:14 EST