/*
* Perform some simple tests that should catch situations where
* our registers are invalidly mapped.
*/
int
ahd_pci_test_register_access(struct ahd_softc *ahd)
{
uint32_t cmd;
u_int targpcistat;
u_int pci_status1;
int error;
uint8_t hcntrl;
error = EIO;
/*
* Enable PCI error interrupt status, but suppress NMIs
* generated by SERR raised due to target aborts.
*/
cmd = ahd_pci_read_config(ahd->dev_softc, PCIR_COMMAND, /*bytes*/2);
ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
cmd & ~PCIM_CMD_SERRESPEN, /*bytes*/2);
/*
* First a simple test to see if any
* registers can be read. Reading
* HCNTRL has no side effects and has
* at least one bit that is guaranteed to
* be zero so it is a good register to
* use for this test.
*/
hcntrl = ahd_inb(ahd, HCNTRL);
if (hcntrl == 0xFF)
goto fail;
/*
* Next create a situation where write combining
* or read prefetching could be initiated by the
* CPU or host bridge. Our device does not support
* either, so look for data corruption and/or flaged
* PCI errors. First pause without causing another
* chip reset.
*/
hcntrl &= ~CHIPRST;
ahd_outb(ahd, HCNTRL, hcntrl|PAUSE);
while (ahd_is_paused(ahd) == 0)
;
/* Clear any PCI errors that occurred before our driver attached. */
ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
targpcistat = ahd_inb(ahd, TARGPCISTAT);
ahd_outb(ahd, TARGPCISTAT, targpcistat);
pci_status1 = ahd_pci_read_config(ahd->dev_softc,
PCIR_STATUS + 1, /*bytes*/1);
ahd_pci_write_config(ahd->dev_softc, PCIR_STATUS + 1,
pci_status1, /*bytes*/1);
ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
ahd_outb(ahd, CLRINT, CLRPCIINT);
ahd_outb(ahd, SEQCTL0, PERRORDIS);
ahd_outl(ahd, SRAM_BASE, 0x5aa555aa);
if (ahd_inl(ahd, SRAM_BASE) != 0x5aa555aa)
goto fail;
if ((ahd_inb(ahd, INTSTAT) & PCIINT) != 0) {
u_int targpcistat;
ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
targpcistat = ahd_inb(ahd, TARGPCISTAT);
if ((targpcistat & STA) != 0)
goto fail;
}
error = 0;
fail:
if ((ahd_inb(ahd, INTSTAT) & PCIINT) != 0) {
ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
targpcistat = ahd_inb(ahd, TARGPCISTAT);
/* Silently clear any latched errors. */
ahd_outb(ahd, TARGPCISTAT, targpcistat);
pci_status1 = ahd_pci_read_config(ahd->dev_softc,
PCIR_STATUS + 1, /*bytes*/1);
ahd_pci_write_config(ahd->dev_softc, PCIR_STATUS + 1,
pci_status1, /*bytes*/1);
ahd_outb(ahd, CLRINT, CLRPCIINT);
}
ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS);
ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND, cmd, /*bytes*/2);
return (error);
}
int
ahd_pci_test_register_access(struct ahd_softc *ahd)
{
uint32_t cmd;
u_int targpcistat;
u_int pci_status1;
int error;
uint8_t hcntrl;
error = EIO;
cmd = ahd_pci_read_config(ahd->dev_softc, PCIR_COMMAND, 2);
ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND,
cmd & ~PCIM_CMD_SERRESPEN, 2);
hcntrl = ahd_inb(ahd, HCNTRL);
if (hcntrl == 0xFF)
goto fail;
hcntrl &= ~CHIPRST;
ahd_outb(ahd, HCNTRL, hcntrl|PAUSE);
while (ahd_is_paused(ahd) == 0)
;
ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
targpcistat = ahd_inb(ahd, TARGPCISTAT);
ahd_outb(ahd, TARGPCISTAT, targpcistat);
pci_status1 = ahd_pci_read_config(ahd->dev_softc,
PCIR_STATUS + 1, 1);
ahd_pci_write_config(ahd->dev_softc, PCIR_STATUS + 1,
pci_status1, 1);
ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
ahd_outb(ahd, CLRINT, CLRPCIINT);
ahd_outb(ahd, SEQCTL0, PERRORDIS);
ahd_outl(ahd, SRAM_BASE, 0x5aa555aa);
if (ahd_inl(ahd, SRAM_BASE) != 0x5aa555aa)
goto fail;
if ((ahd_inb(ahd, INTSTAT) & PCIINT) != 0) {
ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
targpcistat = ahd_inb(ahd, TARGPCISTAT);
if ((targpcistat & STA) != 0)
goto fail;
}
error = 0;
fail:
if ((ahd_inb(ahd, INTSTAT) & PCIINT) != 0) {
ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
targpcistat = ahd_inb(ahd, TARGPCISTAT);
ahd_outb(ahd, TARGPCISTAT, targpcistat);
pci_status1 = ahd_pci_read_config(ahd->dev_softc,
PCIR_STATUS + 1, 1);
ahd_pci_write_config(ahd->dev_softc, PCIR_STATUS + 1,
pci_status1, 1);
ahd_outb(ahd, CLRINT, CLRPCIINT);
}
ahd_outb(ahd, SEQCTL0, PERRORDIS|FAILDIS);
ahd_pci_write_config(ahd->dev_softc, PCIR_COMMAND, cmd, 2);
return (error);
}
