forked from Minki/linux
c7a46533ff
Merge the algorithm id part (16 upper bits) of the i2c adapters ids into the definition of the adapters ids directly. After that, we don't need to OR both ids together for each i2c_adapter structure. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
218 lines
6.8 KiB
C
218 lines
6.8 KiB
C
/* ------------------------------------------------------------------------- */
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/* i2c-algo-sibyte.c i2c driver algorithms for bit-shift adapters */
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/* ------------------------------------------------------------------------- */
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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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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* ------------------------------------------------------------------------- */
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/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
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Frodo Looijaard <frodol@dds.nl>. */
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/* Ported for SiByte SOCs by Broadcom Corporation. */
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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 <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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#include <linux/i2c.h>
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#include <linux/i2c-algo-sibyte.h>
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/* ----- global defines ----------------------------------------------- */
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#define SMB_CSR(a,r) ((long)(a->reg_base + r))
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/* ----- global variables --------------------------------------------- */
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/* module parameters:
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*/
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static int bit_scan=0; /* have a look at what's hanging 'round */
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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) | (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), 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), SMB_CSR(adap, R_SMB_DATA));
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csr_out32(V_SMB_MB(data->word >> 8), 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 int algo_control(struct i2c_adapter *adapter,
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unsigned int cmd, unsigned long arg)
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{
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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 struct i2c_algorithm i2c_sibyte_algo = {
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.smbus_xfer = smbus_xfer,
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.algo_control = algo_control, /* ioctl */
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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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int i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
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{
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int i;
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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 frequency to 100 kHz */
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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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/* scan bus */
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if (bit_scan) {
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union i2c_smbus_data data;
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int rc;
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printk(KERN_INFO " i2c-algo-sibyte.o: scanning bus %s.\n",
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i2c_adap->name);
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for (i = 0x00; i < 0x7f; i++) {
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/* XXXKW is this a realistic probe? */
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rc = smbus_xfer(i2c_adap, i, 0, I2C_SMBUS_READ, 0,
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I2C_SMBUS_BYTE_DATA, &data);
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if (!rc) {
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printk("(%02x)",i);
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} else
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printk(".");
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}
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printk("\n");
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}
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i2c_add_adapter(i2c_adap);
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return 0;
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}
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int i2c_sibyte_del_bus(struct i2c_adapter *adap)
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{
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int res;
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if ((res = i2c_del_adapter(adap)) < 0)
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return res;
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return 0;
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}
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int __init i2c_algo_sibyte_init (void)
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{
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printk("i2c-algo-sibyte.o: i2c SiByte algorithm module\n");
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return 0;
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}
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EXPORT_SYMBOL(i2c_sibyte_add_bus);
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EXPORT_SYMBOL(i2c_sibyte_del_bus);
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#ifdef MODULE
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MODULE_AUTHOR("Kip Walker, Broadcom Corp.");
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MODULE_DESCRIPTION("SiByte I2C-Bus algorithm");
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MODULE_PARM(bit_scan, "i");
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MODULE_PARM_DESC(bit_scan, "Scan for active chips on the bus");
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MODULE_LICENSE("GPL");
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int init_module(void)
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{
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return i2c_algo_sibyte_init();
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}
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void cleanup_module(void)
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{
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}
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#endif
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