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[hermon] Reset device during probe() 

Some systems will retry their boot sequence in the event of a boot
failure.  On these systems, the second and subsequent boot attempts
will fail to initialise the Hermon HCA.

Fix by resetting the HCA during probe().  This incurs a one-second
cost, but there seems to be no viable alternative.

Originally-fixed-by: Itay Gazit <itaygazit@gmail.com>
This commit is contained in:
Michael Brown 2009-10-14 02:09:49 +01:00
parent 4175b778c2
commit 9f7141a1ce
2 changed files with 28 additions and 0 deletions
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23
src/drivers/infiniband/hermon.c
View File

@ -29,6 +29,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <byteswap.h>
#include <gpxe/io.h>
#include <gpxe/pci.h>
#include <gpxe/pcibackup.h>
#include <gpxe/malloc.h>
#include <gpxe/umalloc.h>
#include <gpxe/iobuf.h>
@ -2550,6 +2551,25 @@ static int hermon_configure_special_qps ( struct hermon *hermon ) {
return 0;
}
/**
* Reset device
*
* @v hermon Hermon device
* @v pci PCI device
*/
static void hermon_reset ( struct hermon *hermon,
struct pci_device *pci ) {
struct pci_config_backup backup;
static const uint8_t backup_exclude[] =
PCI_CONFIG_BACKUP_EXCLUDE ( 0x58, 0x5c );
pci_backup ( pci, &backup, backup_exclude );
writel ( HERMON_RESET_MAGIC,
( hermon->config + HERMON_RESET_OFFSET ) );
mdelay ( HERMON_RESET_WAIT_TIME_MS );
pci_restore ( pci, &backup, backup_exclude );
}
/**
* Probe PCI device
*
@ -2582,6 +2602,9 @@ static int hermon_probe ( struct pci_device *pci,
hermon->uar = ioremap ( pci_bar_start ( pci, HERMON_PCI_UAR_BAR ),
HERMON_UAR_NON_EQ_PAGE * HERMON_PAGE_SIZE );
/* Reset device */
hermon_reset ( hermon, pci );
/* Allocate space for mailboxes */
hermon->mailbox_in = malloc_dma ( HERMON_MBOX_SIZE,
HERMON_MBOX_ALIGN );

5
src/drivers/infiniband/hermon.h
View File

@ -29,6 +29,11 @@ FILE_LICENCE ( GPL2_OR_LATER );
#define HERMON_PCI_CONFIG_BAR_SIZE 0x100000
#define HERMON_PCI_UAR_BAR PCI_BASE_ADDRESS_2
/* Device reset */
#define HERMON_RESET_OFFSET 0x0f0010
#define HERMON_RESET_MAGIC 0x01000000UL
#define HERMON_RESET_WAIT_TIME_MS 1000
/* Work queue entry and completion queue entry opcodes */
#define HERMON_OPCODE_NOP 0x00
#define HERMON_OPCODE_SEND 0x0a