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    Subject[BUG 2.6.18] sata_promise unaligned PCI accesses on sparc64
    The 2.6.18 kernel's sata_promise driver causes alignment
    traps in my Ultra5 sparc64 machine. dmesg shows:

    SCSI subsystem initialized
    libata version 2.00 loaded.
    sata_promise 0000:02:03.0: version 1.04
    Kernel unaligned access at TPC[100a8cbc] pdc_ata_init_one+0x284/0x308 [sata_promise]
    Kernel unaligned access at TPC[100a8cd0] pdc_ata_init_one+0x298/0x308 [sata_promise]
    Kernel unaligned access at TPC[100a8cd4] pdc_ata_init_one+0x29c/0x308 [sata_promise]
    ata1: SATA max UDMA/133 cmd 0x1FF00008200 ctl 0x1FF00008238 bmdma 0x0 irq 18
    ata2: SATA max UDMA/133 cmd 0x1FF00008280 ctl 0x1FF000082B8 bmdma 0x0 irq 18
    scsi0 : sata_promise
    ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
    ata1.00: ATA-6, max UDMA/133, 312581808 sectors: LBA48 NCQ (depth 0/32)
    ata1.00: configured for UDMA/133
    scsi1 : sata_promise
    ata2: SATA link down (SStatus 0 SControl 300)
    Vendor: ATA Model: ST3160827AS Rev: 3.42
    Type: Direct-Access ANSI SCSI revision: 05

    Using debug printk:s I've traced this to the three PDC_TBG_MODE
    accesses in sata_promise.c:pdc_host_init():

    /* reduce TBG clock to 133 Mhz. */
    tmp = readl(mmio + PDC_TBG_MODE);
    tmp &= ~0x30000; /* clear bit 17, 16*/
    tmp |= 0x10000; /* set bit 17:16 = 0:1 */
    writel(tmp, mmio + PDC_TBG_MODE);

    readl(mmio + PDC_TBG_MODE); /* flush */

    The debugging printk:s also showed that mmio points to
    0x000001ff00008000 and that PDC_TBG_MODE is 65, so mmio+PDC_TBG_MODE
    cannot possibly be 32-bit aligned.

    From reading sata_promise.c it appears that PDC_TBG_MODE also
    intersects both PDC_INT_SEQMASK and PDC_FLASH_CTL, which I find weird.

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      Last update: 2006-09-24 17:05    [W:0.021 / U:152.940 seconds]
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