/* * Copyright (C) 2004 Steven J. Hill * Copyright (C) 2001,2002,2003 Broadcom Corporation * Copyright (C) 1995-2000 Simon G. Vogl * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/i2c.h> #include <asm/io.h> #include <asm/sibyte/sb1250_regs.h> #include <asm/sibyte/sb1250_smbus.h> struct i2c_algo_sibyte_data { void *data; /* private data */ int bus; /* which bus */ void *reg_base; /* CSR base */ }; /* ----- global defines ----------------------------------------------- */ #define SMB_CSR(a,r) ((long)(a->reg_base + r)) static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr, unsigned short flags, char read_write, u8 command, int size, union i2c_smbus_data * data) { struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; int data_bytes = 0; int error; while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) ; switch (size) { case I2C_SMBUS_QUICK: csr_out32((V_SMB_ADDR(addr) | (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) | V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START)); break; case I2C_SMBUS_BYTE: if (read_write == I2C_SMBUS_READ) { csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE), SMB_CSR(adap, R_SMB_START)); data_bytes = 1; } else { csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE), SMB_CSR(adap, R_SMB_START)); } break; case I2C_SMBUS_BYTE_DATA: csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); if (read_write == I2C_SMBUS_READ) { csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE), SMB_CSR(adap, R_SMB_START)); data_bytes = 1; } else { csr_out32(V_SMB_LB(data->byte), SMB_CSR(adap, R_SMB_DATA)); csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), SMB_CSR(adap, R_SMB_START)); } break; case I2C_SMBUS_WORD_DATA: csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); if (read_write == I2C_SMBUS_READ) { csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE), SMB_CSR(adap, R_SMB_START)); data_bytes = 2; } else { csr_out32(V_SMB_LB(data->word & 0xff), SMB_CSR(adap, R_SMB_DATA)); csr_out32(V_SMB_MB(data->word >> 8), SMB_CSR(adap, R_SMB_DATA)); csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), SMB_CSR(adap, R_SMB_START)); } break; default: return -1; /* XXXKW better error code? */ } while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) ; error = csr_in32(SMB_CSR(adap, R_SMB_STATUS)); if (error & M_SMB_ERROR) { /* Clear error bit by writing a 1 */ csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS)); return -1; /* XXXKW better error code? */ } if (data_bytes == 1) data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff; if (data_bytes == 2) data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff; return 0; } static u32 bit_func(struct i2c_adapter *adap) { return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA); } /* -----exported algorithm data: ------------------------------------- */ static const struct i2c_algorithm i2c_sibyte_algo = { .smbus_xfer = smbus_xfer, .functionality = bit_func, }; /* * registering functions to load algorithms at runtime */ static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed) { struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; /* Register new adapter to i2c module... */ i2c_adap->algo = &i2c_sibyte_algo; /* Set the requested frequency. */ csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ)); csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL)); return i2c_add_numbered_adapter(i2c_adap); } static struct i2c_algo_sibyte_data sibyte_board_data[2] = { { NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) }, { NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) } }; static struct i2c_adapter sibyte_board_adapter[2] = { { .owner = THIS_MODULE, .id = I2C_HW_SIBYTE, .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, .algo = NULL, .algo_data = &sibyte_board_data[0], .nr = 0, .name = "SiByte SMBus 0", }, { .owner = THIS_MODULE, .id = I2C_HW_SIBYTE, .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, .algo = NULL, .algo_data = &sibyte_board_data[1], .nr = 1, .name = "SiByte SMBus 1", }, }; static int __init i2c_sibyte_init(void) { pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n"); if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0) return -ENODEV; if (i2c_sibyte_add_bus(&sibyte_board_adapter[1], K_SMB_FREQ_400KHZ) < 0) { i2c_del_adapter(&sibyte_board_adapter[0]); return -ENODEV; } return 0; } static void __exit i2c_sibyte_exit(void) { i2c_del_adapter(&sibyte_board_adapter[0]); i2c_del_adapter(&sibyte_board_adapter[1]); } module_init(i2c_sibyte_init); module_exit(i2c_sibyte_exit); MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>"); MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards"); MODULE_LICENSE("GPL");