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186 lines
4.9 KiB
186 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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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#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 <linux/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 -EOPNOTSUPP; |
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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 (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO; |
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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.)"); |
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MODULE_AUTHOR("Steven J. Hill <[email protected]>"); |
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MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards"); |
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MODULE_LICENSE("GPL");
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