mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 19:16:40 +07:00
1745522ccb
Signed-off-by: Jean Delvare <khali@linux-fr.org>
199 lines
5.6 KiB
C
199 lines
5.6 KiB
C
/*
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* Copyright (C) 2004 Steven J. Hill
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* Copyright (C) 2001,2002,2003 Broadcom Corporation
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* Copyright (C) 1995-2000 Simon G. Vogl
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <asm/io.h>
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#include <asm/sibyte/sb1250_regs.h>
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#include <asm/sibyte/sb1250_smbus.h>
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struct i2c_algo_sibyte_data {
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void *data; /* private data */
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int bus; /* which bus */
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void *reg_base; /* CSR base */
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};
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/* ----- global defines ----------------------------------------------- */
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#define SMB_CSR(a,r) ((long)(a->reg_base + r))
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static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
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unsigned short flags, char read_write,
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u8 command, int size, union i2c_smbus_data * data)
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{
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struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
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int data_bytes = 0;
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int error;
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while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
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;
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switch (size) {
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case I2C_SMBUS_QUICK:
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csr_out32((V_SMB_ADDR(addr) |
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(read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) |
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V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
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break;
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case I2C_SMBUS_BYTE:
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if (read_write == I2C_SMBUS_READ) {
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE),
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SMB_CSR(adap, R_SMB_START));
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data_bytes = 1;
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} else {
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csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE),
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SMB_CSR(adap, R_SMB_START));
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}
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break;
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case I2C_SMBUS_BYTE_DATA:
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csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
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if (read_write == I2C_SMBUS_READ) {
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE),
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SMB_CSR(adap, R_SMB_START));
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data_bytes = 1;
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} else {
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csr_out32(V_SMB_LB(data->byte),
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SMB_CSR(adap, R_SMB_DATA));
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
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SMB_CSR(adap, R_SMB_START));
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}
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break;
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case I2C_SMBUS_WORD_DATA:
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csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
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if (read_write == I2C_SMBUS_READ) {
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE),
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SMB_CSR(adap, R_SMB_START));
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data_bytes = 2;
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} else {
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csr_out32(V_SMB_LB(data->word & 0xff),
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SMB_CSR(adap, R_SMB_DATA));
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csr_out32(V_SMB_MB(data->word >> 8),
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SMB_CSR(adap, R_SMB_DATA));
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
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SMB_CSR(adap, R_SMB_START));
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}
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break;
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default:
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return -1; /* XXXKW better error code? */
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}
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while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
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;
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error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
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if (error & M_SMB_ERROR) {
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/* Clear error bit by writing a 1 */
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csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
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return -1; /* XXXKW better error code? */
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}
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if (data_bytes == 1)
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data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
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if (data_bytes == 2)
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data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;
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return 0;
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}
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static u32 bit_func(struct i2c_adapter *adap)
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{
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return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA);
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}
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/* -----exported algorithm data: ------------------------------------- */
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static const struct i2c_algorithm i2c_sibyte_algo = {
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.smbus_xfer = smbus_xfer,
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.functionality = bit_func,
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};
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/*
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* registering functions to load algorithms at runtime
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*/
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static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
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{
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struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
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/* Register new adapter to i2c module... */
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i2c_adap->algo = &i2c_sibyte_algo;
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/* Set the requested frequency. */
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csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
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csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
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return i2c_add_numbered_adapter(i2c_adap);
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}
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static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
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{ NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
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{ NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
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};
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static struct i2c_adapter sibyte_board_adapter[2] = {
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{
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.owner = THIS_MODULE,
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.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
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.algo = NULL,
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.algo_data = &sibyte_board_data[0],
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.nr = 0,
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.name = "SiByte SMBus 0",
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},
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{
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.owner = THIS_MODULE,
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.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
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.algo = NULL,
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.algo_data = &sibyte_board_data[1],
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.nr = 1,
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.name = "SiByte SMBus 1",
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},
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};
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static int __init i2c_sibyte_init(void)
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{
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pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n");
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if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0)
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return -ENODEV;
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if (i2c_sibyte_add_bus(&sibyte_board_adapter[1],
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K_SMB_FREQ_400KHZ) < 0) {
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i2c_del_adapter(&sibyte_board_adapter[0]);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit i2c_sibyte_exit(void)
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{
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i2c_del_adapter(&sibyte_board_adapter[0]);
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i2c_del_adapter(&sibyte_board_adapter[1]);
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}
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module_init(i2c_sibyte_init);
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module_exit(i2c_sibyte_exit);
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MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
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MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
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MODULE_LICENSE("GPL");
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