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Diffstat (limited to 'drivers/i2c/busses/i2c-amd756-s4882.c')
-rw-r--r--drivers/i2c/busses/i2c-amd756-s4882.c245
1 files changed, 0 insertions, 245 deletions
diff --git a/drivers/i2c/busses/i2c-amd756-s4882.c b/drivers/i2c/busses/i2c-amd756-s4882.c
deleted file mode 100644
index 063274388a75..000000000000
--- a/drivers/i2c/busses/i2c-amd756-s4882.c
+++ /dev/null
@@ -1,245 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * i2c-amd756-s4882.c - i2c-amd756 extras for the Tyan S4882 motherboard
- *
- * Copyright (C) 2004, 2008 Jean Delvare <jdelvare@suse.de>
- */
-
-/*
- * We select the channels by sending commands to the Philips
- * PCA9556 chip at I2C address 0x18. The main adapter is used for
- * the non-multiplexed part of the bus, and 4 virtual adapters
- * are defined for the multiplexed addresses: 0x50-0x53 (memory
- * module EEPROM) located on channels 1-4, and 0x4c (LM63)
- * located on multiplexed channels 0 and 5-7. We define one
- * virtual adapter per CPU, which corresponds to two multiplexed
- * channels:
- * CPU0: virtual adapter 1, channels 1 and 0
- * CPU1: virtual adapter 2, channels 2 and 5
- * CPU2: virtual adapter 3, channels 3 and 6
- * CPU3: virtual adapter 4, channels 4 and 7
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/i2c.h>
-#include <linux/mutex.h>
-
-extern struct i2c_adapter amd756_smbus;
-
-static struct i2c_adapter *s4882_adapter;
-static struct i2c_algorithm *s4882_algo;
-
-/* Wrapper access functions for multiplexed SMBus */
-static DEFINE_MUTEX(amd756_lock);
-
-static s32 amd756_access_virt0(struct i2c_adapter * adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size,
- union i2c_smbus_data * data)
-{
- int error;
-
- /* We exclude the multiplexed addresses */
- if (addr == 0x4c || (addr & 0xfc) == 0x50 || (addr & 0xfc) == 0x30
- || addr == 0x18)
- return -ENXIO;
-
- mutex_lock(&amd756_lock);
-
- error = amd756_smbus.algo->smbus_xfer(adap, addr, flags, read_write,
- command, size, data);
-
- mutex_unlock(&amd756_lock);
-
- return error;
-}
-
-/* We remember the last used channels combination so as to only switch
- channels when it is really needed. This greatly reduces the SMBus
- overhead, but also assumes that nobody will be writing to the PCA9556
- in our back. */
-static u8 last_channels;
-
-static inline s32 amd756_access_channel(struct i2c_adapter * adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size,
- union i2c_smbus_data * data,
- u8 channels)
-{
- int error;
-
- /* We exclude the non-multiplexed addresses */
- if (addr != 0x4c && (addr & 0xfc) != 0x50 && (addr & 0xfc) != 0x30)
- return -ENXIO;
-
- mutex_lock(&amd756_lock);
-
- if (last_channels != channels) {
- union i2c_smbus_data mplxdata;
- mplxdata.byte = channels;
-
- error = amd756_smbus.algo->smbus_xfer(adap, 0x18, 0,
- I2C_SMBUS_WRITE, 0x01,
- I2C_SMBUS_BYTE_DATA,
- &mplxdata);
- if (error)
- goto UNLOCK;
- last_channels = channels;
- }
- error = amd756_smbus.algo->smbus_xfer(adap, addr, flags, read_write,
- command, size, data);
-
-UNLOCK:
- mutex_unlock(&amd756_lock);
- return error;
-}
-
-static s32 amd756_access_virt1(struct i2c_adapter * adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size,
- union i2c_smbus_data * data)
-{
- /* CPU0: channels 1 and 0 enabled */
- return amd756_access_channel(adap, addr, flags, read_write, command,
- size, data, 0x03);
-}
-
-static s32 amd756_access_virt2(struct i2c_adapter * adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size,
- union i2c_smbus_data * data)
-{
- /* CPU1: channels 2 and 5 enabled */
- return amd756_access_channel(adap, addr, flags, read_write, command,
- size, data, 0x24);
-}
-
-static s32 amd756_access_virt3(struct i2c_adapter * adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size,
- union i2c_smbus_data * data)
-{
- /* CPU2: channels 3 and 6 enabled */
- return amd756_access_channel(adap, addr, flags, read_write, command,
- size, data, 0x48);
-}
-
-static s32 amd756_access_virt4(struct i2c_adapter * adap, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size,
- union i2c_smbus_data * data)
-{
- /* CPU3: channels 4 and 7 enabled */
- return amd756_access_channel(adap, addr, flags, read_write, command,
- size, data, 0x90);
-}
-
-static int __init amd756_s4882_init(void)
-{
- int i, error;
- union i2c_smbus_data ioconfig;
-
- if (!amd756_smbus.dev.parent)
- return -ENODEV;
-
- /* Configure the PCA9556 multiplexer */
- ioconfig.byte = 0x00; /* All I/O to output mode */
- error = i2c_smbus_xfer(&amd756_smbus, 0x18, 0, I2C_SMBUS_WRITE, 0x03,
- I2C_SMBUS_BYTE_DATA, &ioconfig);
- if (error) {
- dev_err(&amd756_smbus.dev, "PCA9556 configuration failed\n");
- error = -EIO;
- goto ERROR0;
- }
-
- /* Unregister physical bus */
- i2c_del_adapter(&amd756_smbus);
-
- printk(KERN_INFO "Enabling SMBus multiplexing for Tyan S4882\n");
- /* Define the 5 virtual adapters and algorithms structures */
- if (!(s4882_adapter = kcalloc(5, sizeof(struct i2c_adapter),
- GFP_KERNEL))) {
- error = -ENOMEM;
- goto ERROR1;
- }
- if (!(s4882_algo = kcalloc(5, sizeof(struct i2c_algorithm),
- GFP_KERNEL))) {
- error = -ENOMEM;
- goto ERROR2;
- }
-
- /* Fill in the new structures */
- s4882_algo[0] = *(amd756_smbus.algo);
- s4882_algo[0].smbus_xfer = amd756_access_virt0;
- s4882_adapter[0] = amd756_smbus;
- s4882_adapter[0].algo = s4882_algo;
- s4882_adapter[0].dev.parent = amd756_smbus.dev.parent;
- for (i = 1; i < 5; i++) {
- s4882_algo[i] = *(amd756_smbus.algo);
- s4882_adapter[i] = amd756_smbus;
- snprintf(s4882_adapter[i].name, sizeof(s4882_adapter[i].name),
- "SMBus 8111 adapter (CPU%d)", i-1);
- s4882_adapter[i].algo = s4882_algo+i;
- s4882_adapter[i].dev.parent = amd756_smbus.dev.parent;
- }
- s4882_algo[1].smbus_xfer = amd756_access_virt1;
- s4882_algo[2].smbus_xfer = amd756_access_virt2;
- s4882_algo[3].smbus_xfer = amd756_access_virt3;
- s4882_algo[4].smbus_xfer = amd756_access_virt4;
-
- /* Register virtual adapters */
- for (i = 0; i < 5; i++) {
- error = i2c_add_adapter(s4882_adapter+i);
- if (error) {
- printk(KERN_ERR "i2c-amd756-s4882: "
- "Virtual adapter %d registration "
- "failed, module not inserted\n", i);
- for (i--; i >= 0; i--)
- i2c_del_adapter(s4882_adapter+i);
- goto ERROR3;
- }
- }
-
- return 0;
-
-ERROR3:
- kfree(s4882_algo);
- s4882_algo = NULL;
-ERROR2:
- kfree(s4882_adapter);
- s4882_adapter = NULL;
-ERROR1:
- /* Restore physical bus */
- i2c_add_adapter(&amd756_smbus);
-ERROR0:
- return error;
-}
-
-static void __exit amd756_s4882_exit(void)
-{
- if (s4882_adapter) {
- int i;
-
- for (i = 0; i < 5; i++)
- i2c_del_adapter(s4882_adapter+i);
- kfree(s4882_adapter);
- s4882_adapter = NULL;
- }
- kfree(s4882_algo);
- s4882_algo = NULL;
-
- /* Restore physical bus */
- if (i2c_add_adapter(&amd756_smbus))
- printk(KERN_ERR "i2c-amd756-s4882: "
- "Physical bus restoration failed\n");
-}
-
-MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
-MODULE_DESCRIPTION("S4882 SMBus multiplexing");
-MODULE_LICENSE("GPL");
-
-module_init(amd756_s4882_init);
-module_exit(amd756_s4882_exit);
generated by cgit (git 2.34.1) at 2025-03-22 09:03:22 +0000