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pm_smbus: correctly report unclaimed cycles 

Without this patch, i2cdetect will report all addresses as present.
With it, only 0x50..0x57 are present.

Before:

         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
    00:          03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
    10: 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
    20: 20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
    30: 30 31 32 33 34 35 36 37 38 39 3a 3b 3c 3d 3e 3f
    40: 40 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d 4e 4f
    50: 50 51 52 53 54 55 56 57 58 59 5a 5b 5c 5d 5e 5f
    60: 60 61 62 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f
    70: 70 71 72 73 74 75 76 77

After:

         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
    00:          -- -- -- -- -- -- -- -- -- -- -- -- --
    10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    50: 50 51 52 53 54 55 56 57 -- -- -- -- -- -- -- --
    60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
    70: -- -- -- -- -- -- -- --

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-03-31 18:26:31 +02:00 committed by Michael S. Tsirkin
parent 046a184414
commit c8097612ce
1 changed files with 41 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
hw/i2c/pm_smbus.c
View File

@ -60,59 +60,78 @@ static void smb_transaction(PMSMBus *s)
uint8_t cmd = s->smb_cmd;
uint8_t addr = s->smb_addr >> 1;
I2CBus *bus = s->smbus;
int ret;
SMBUS_DPRINTF("SMBus trans addr=0x%02x prot=0x%02x\n", addr, prot);
/* Transaction isn't exec if STS_DEV_ERR bit set */
if ((s->smb_stat & STS_DEV_ERR) != 0) {
goto error;
}
goto error;
}
switch(prot) {
case 0x0:
smbus_quick_command(bus, addr, read);
s->smb_stat |= STS_BYTE_DONE | STS_INTR;
break;
ret = smbus_quick_command(bus, addr, read);
goto done;
case 0x1:
if (read) {
s->smb_data0 = smbus_receive_byte(bus, addr);
ret = smbus_receive_byte(bus, addr);
goto data8;
} else {
smbus_send_byte(bus, addr, cmd);
ret = smbus_send_byte(bus, addr, cmd);
goto done;
}
s->smb_stat |= STS_BYTE_DONE | STS_INTR;
break;
case 0x2:
if (read) {
s->smb_data0 = smbus_read_byte(bus, addr, cmd);
ret = smbus_read_byte(bus, addr, cmd);
goto data8;
} else {
smbus_write_byte(bus, addr, cmd, s->smb_data0);
ret = smbus_write_byte(bus, addr, cmd, s->smb_data0);
goto done;
}
s->smb_stat |= STS_BYTE_DONE | STS_INTR;
break;
case 0x3:
if (read) {
uint16_t val;
val = smbus_read_word(bus, addr, cmd);
s->smb_data0 = val;
s->smb_data1 = val >> 8;
ret = smbus_read_word(bus, addr, cmd);
goto data16;
} else {
smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
ret = smbus_write_word(bus, addr, cmd, (s->smb_data1 << 8) | s->smb_data0);
goto done;
}
s->smb_stat |= STS_BYTE_DONE | STS_INTR;
break;
case 0x5:
if (read) {
s->smb_data0 = smbus_read_block(bus, addr, cmd, s->smb_data);
ret = smbus_read_block(bus, addr, cmd, s->smb_data);
goto data8;
} else {
smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
ret = smbus_write_block(bus, addr, cmd, s->smb_data, s->smb_data0);
goto done;
}
s->smb_stat |= STS_BYTE_DONE | STS_INTR;
break;
default:
goto error;
}
abort();
data16:
if (ret < 0) {
goto error;
}
s->smb_data1 = ret >> 8;
data8:
if (ret < 0) {
goto error;
}
s->smb_data0 = ret;
done:
if (ret < 0) {
goto error;
}
s->smb_stat |= STS_BYTE_DONE | STS_INTR;
return;
error:
error:
s->smb_stat |= STS_DEV_ERR;
return;
}
static void smb_ioport_writeb(void *opaque, hwaddr addr, uint64_t val,