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/*
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 * PC SMBus implementation
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 * splitted from acpi.c
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 *
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 * Copyright (c) 2006 Fabrice Bellard
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License version 2 as published by the Free Software Foundation.
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 *
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 * This library 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 GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
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 */
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#include "hw.h"
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#include "pc.h"
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#include "pm_smbus.h"
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#include "smbus.h"
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/* no save/load? */
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#define SMBHSTSTS       0x00
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#define SMBHSTCNT       0x02
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#define SMBHSTCMD       0x03
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#define SMBHSTADD       0x04
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#define SMBHSTDAT0      0x05
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#define SMBHSTDAT1      0x06
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#define SMBBLKDAT       0x07
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//#define DEBUG
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#ifdef DEBUG
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# define SMBUS_DPRINTF(format, ...)     printf(format, ## __VA_ARGS__)
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#else
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# define SMBUS_DPRINTF(format, ...)     do { } while (0)
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#endif
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static void smb_transaction(PMSMBus *s)
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{
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    uint8_t prot = (s->smb_ctl >> 2) & 0x07;
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    uint8_t read = s->smb_addr & 0x01;
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    uint8_t cmd = s->smb_cmd;
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    uint8_t addr = s->smb_addr >> 1;
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    i2c_bus *bus = s->smbus;
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    SMBUS_DPRINTF("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
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    switch(prot) {
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    case 0x0:
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        smbus_quick_command(bus, addr, read);
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        break;
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    case 0x1:
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        if (read) {
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            s->smb_data0 = smbus_receive_byte(bus, addr);
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        } else {
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            smbus_send_byte(bus, addr, cmd);
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        }
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        break;
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    case 0x2:
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        if (read) {
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            s->smb_data0 = smbus_read_byte(bus, addr, cmd);
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        } else {
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            smbus_write_byte(bus, addr, cmd, s->smb_data0);
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        }
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        break;
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    case 0x3:
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        if (read) {
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            uint16_t val;
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            val = smbus_read_word(bus, addr, cmd);
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            s->smb_data0 = val;
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            s->smb_data1 = val >> 8;
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        } else {
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            smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
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        }
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        break;
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    case 0x5:
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        if (read) {
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            s->smb_data0 = smbus_read_block(bus, addr, cmd, s->smb_data);
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        } else {
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            smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
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        }
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        break;
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    default:
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        goto error;
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    }
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    return;
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  error:
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    s->smb_stat |= 0x04;
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}
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void smb_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
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{
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    PMSMBus *s = opaque;
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    addr &= 0x3f;
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    SMBUS_DPRINTF("SMB writeb port=0x%04x val=0x%02x\n", addr, val);
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    switch(addr) {
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    case SMBHSTSTS:
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        s->smb_stat = 0;
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        s->smb_index = 0;
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        break;
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    case SMBHSTCNT:
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        s->smb_ctl = val;
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        if (val & 0x40)
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            smb_transaction(s);
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        break;
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    case SMBHSTCMD:
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        s->smb_cmd = val;
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        break;
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    case SMBHSTADD:
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        s->smb_addr = val;
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        break;
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    case SMBHSTDAT0:
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        s->smb_data0 = val;
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        break;
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    case SMBHSTDAT1:
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        s->smb_data1 = val;
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        break;
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    case SMBBLKDAT:
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        s->smb_data[s->smb_index++] = val;
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        if (s->smb_index > 31)
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            s->smb_index = 0;
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        break;
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    default:
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        break;
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    }
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}
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uint32_t smb_ioport_readb(void *opaque, uint32_t addr)
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{
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    PMSMBus *s = opaque;
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    uint32_t val;
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    addr &= 0x3f;
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    switch(addr) {
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    case SMBHSTSTS:
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        val = s->smb_stat;
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        break;
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    case SMBHSTCNT:
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        s->smb_index = 0;
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        val = s->smb_ctl & 0x1f;
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        break;
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    case SMBHSTCMD:
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        val = s->smb_cmd;
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        break;
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    case SMBHSTADD:
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        val = s->smb_addr;
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        break;
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    case SMBHSTDAT0:
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        val = s->smb_data0;
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        break;
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    case SMBHSTDAT1:
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        val = s->smb_data1;
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        break;
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    case SMBBLKDAT:
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        val = s->smb_data[s->smb_index++];
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        if (s->smb_index > 31)
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            s->smb_index = 0;
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        break;
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    default:
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        val = 0;
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        break;
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    }
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    SMBUS_DPRINTF("SMB readb port=0x%04x val=0x%02x\n", addr, val);
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    return val;
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}
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void pm_smbus_init(DeviceState *parent, PMSMBus *smb)
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{
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    smb->smbus = i2c_init_bus(parent, "i2c");
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}