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Add a routine for testing memory mapped register access.

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This will hopefully detect things like buggy via chipsets
so that the OSM can fallback to using I/O mapped access
when memory mapped I/O simply will not work.

Approved by:	re (blanket)
This commit is contained in:
Scott Long 2002-11-30 19:13:55 +00:00
parent 24dd01c695
commit dc67dad8b1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=107419
1 changed files with 58 additions and 8 deletions
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66
sys/dev/aic7xxx/aic7xxx_pci.c
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@ -39,7 +39,7 @@
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* $Id: //depot/aic7xxx/aic7xxx/aic7xxx_pci.c#50 $
* $Id: //depot/aic7xxx/aic7xxx/aic7xxx_pci.c#52 $
*
* $FreeBSD$
*/
@ -660,6 +660,14 @@ const u_int ahc_num_pci_devs = NUM_ELEMENTS(ahc_pci_ident_table);
#define CACHESIZE 0x0000003ful /* only 5 bits */
#define LATTIME 0x0000ff00ul
/* PCI STATUS definitions */
#define DPE 0x80
#define SSE 0x40
#define RMA 0x20
#define RTA 0x10
#define STA 0x08
#define DPR 0x01
static int ahc_9005_subdevinfo_valid(uint16_t vendor, uint16_t device,
uint16_t subvendor, uint16_t subdevice);
static int ahc_ext_scbram_present(struct ahc_softc *ahc);
@ -1187,6 +1195,55 @@ ahc_probe_ext_scbram(struct ahc_softc *ahc)
ahc_scbram_config(ahc, enable, pcheck, fast, large);
}
/*
* Perform some simple tests that should catch situations where
* our registers are invalidly mapped.
*/
int
ahc_pci_test_register_access(struct ahc_softc *ahc)
{
int i;
u_int status1;
/*
* 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.
*/
if (ahc_inb(ahc, HCNTRL) == 0xFF)
return (EIO);
/*
* 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 flagged
* PCI errors.
*/
for (i = 0; i < 16; i++)
ahc_outb(ahc, SRAM_BASE + i, i);
for (i = 0; i < 16; i++)
if (ahc_inb(ahc, SRAM_BASE + i) != i)
return (EIO);
status1 = ahc_pci_read_config(ahc->dev_softc,
PCIR_STATUS + 1, /*bytes*/1);
if ((status1 & STA) != 0) {
/* Silently clear any latched errors. */
ahc_pci_write_config(ahc->dev_softc, PCIR_STATUS + 1,
status1, /*bytes*/1);
ahc_outb(ahc, CLRINT, CLRPARERR);
return (EIO);
}
return (0);
}
/*
* Check the external port logic for a serial eeprom
* and termination/cable detection contrls.
@ -1852,13 +1909,6 @@ read_brdctl(ahc)
return (value);
}
#define DPE 0x80
#define SSE 0x40
#define RMA 0x20
#define RTA 0x10
#define STA 0x08
#define DPR 0x01
void
ahc_pci_intr(struct ahc_softc *ahc)
{