On Wed, Apr 29, 2009 at 6:49 PM, s ticket <smticket@xxxxxxxxx> wrote:
> Is there any way to read PMP registers after hardreset/softreset?
hard or soft reset of the port behind 88SX7042 or the port behind the PMP?
After a 88SX7042 port hard reset, will anything interesting remain on
the PMP to read?
Have you looked at sata_pmp_read_gscr() andsata_pmp_scr_read()
in drivers/ata/libata-pmp.c?
sorry, just more questions.
grant
> SATA Controller is marvell 88SX7042 and driver is sata_mv.
> I try to send 0xE4 and 0xE6 command to read/write PMP registers:
>
> struct sg_io_hdr io_hdr;
> unsigned char cdb[SG_ATA_16_LEN];
> unsigned char sb[32];
> unsigned char data[4096];
>
> memset(&io_hdr, 0, sizeof(io_hdr));
> memset(&cdb, 0, sizeof(cdb));
> memset(&sb, 0, sizeof(sb));
> memset(&data, 0, sizeof(data));
>
> cdb[0] = SG_ATA_16;
> cdb[1] = SG_ATA_PROTO_NON_DATA;
>
> cdb[2] = SG_CDB2_CHECK_COND;
> cdb[4] = (unsigned char)reg;
> cdb[13] = 0xF;
> cdb[14] = 0xe8;
>
> io_hdr.interface_id = 'S';
> io_hdr.mx_sb_len = sizeof(sb);
> io_hdr.dxfer_direction = SG_DXFER_NONE;
> io_hdr.dxfer_len = 0;
> io_hdr.dxferp = NULL;
> io_hdr.cmdp = cdb;
> io_hdr.cmd_len = SG_ATA_16_LEN;
> io_hdr.sbp = sb;
>
> io_hdr.pack_id = 0;
> io_hdr.timeout = 16000;
> if (ioctl(fd, SG_IO, &io_hdr) == -1) {
> perror("ioctl(fd, SG_IO)");
> return -1;
> }
>
> But after 'ioctl', the SATA link fails to read SCR1 and start resetting:
>
> ata1.00: failed to read SCR 1 (Emask=0x40)
> ata1.01: failed to read SCR 1 (Emask=0x40)
> ata1.02: failed to read SCR 1 (Emask=0x40)
> ata1.03: failed to read SCR 1 (Emask=0x40)
> ata1.00: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata1.01: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata1.01: cmd e8/00:00:00:00:00/00:00:00:00:00/0f tag 0
> res 58/00:00:00:00:00/00:00:00:00:00/0f Emask 0x2 (HSM violation)
> ata1.01: status: { DRDY DRQ }
> ata1.02: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata1.03: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen
> ata1.15: hard resetting link
>
> Is there any suggestion?
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