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Implement "pci enum" command for CONFIG_DM_PCI

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With CONFIG_DM_PCI enabled, PCI buses are not enumerated at boot, as they
are without that config option enabled. No command exists to enumerate the
PCI buses. Hence, unless some board-specific code causes PCI enumeration,
PCI-based Ethernet devices are not detected, and network access is not
available.

This patch implements "pci enum" in the CONFIG_DM_PCI case, thus giving a
mechanism whereby PCI can be enumerated.

do_pci()'s handling of case 'e' is moved into a single location before the
dev variable is assigned, in order to skip calculation of dev. The enum
sub-command doesn't need the dev value, and skipping its calculation
avoids an irrelevant error being printed.

Using a command to initialize PCI like this has a disadvantage relative to
enumerating PCI at boot. In particular, Ethernet devices are not probed
during PCI enumeration, but only when used. This defers setting variables
such as ethact, ethaddr, etc. until the first network-related command is
executed. Hopefully this will not cause further issues. Perhaps in the
long term, we need a "net start/enum" command too?

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Stephen Warren 2016-01-26 11:10:11 -07:00 committed by Simon Glass
parent be1df82656
commit e578b92cdb
2 changed files with 20 additions and 13 deletions
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18
cmd/pci.c
View file

@ -578,9 +578,10 @@ static int do_pci(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
if ((bdf = get_pci_dev(argv[2])) == -1)
return 1;
break;
#ifdef CONFIG_CMD_PCI_ENUM
#if defined(CONFIG_CMD_PCI_ENUM) || defined(CONFIG_DM_PCI)
case 'e':
break;
pci_init();
return 0;
#endif
default: /* scan bus */
value = 1; /* short listing */
@ -621,15 +622,6 @@ static int do_pci(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
break;
case 'd': /* display */
return pci_cfg_display(dev, addr, size, value);
#ifdef CONFIG_CMD_PCI_ENUM
case 'e':
# ifdef CONFIG_DM_PCI
printf("This command is not yet supported with driver model\n");
# else
pci_init();
# endif
break;
#endif
case 'n': /* next */
if (argc < 4)
goto usage;
@ -665,9 +657,9 @@ static int do_pci(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
static char pci_help_text[] =
"[bus] [long]\n"
" - short or long list of PCI devices on bus 'bus'\n"
#ifdef CONFIG_CMD_PCI_ENUM
#if defined(CONFIG_CMD_PCI_ENUM) || defined(CONFIG_DM_PCI)
"pci enum\n"
" - re-enumerate PCI buses\n"
" - Enumerate PCI buses\n"
#endif
"pci header b.d.f\n"
" - show header of PCI device 'bus.device.function'\n"

15
drivers/pci/pci-uclass.c
View file

@ -1241,3 +1241,18 @@ U_BOOT_DRIVER(pci_generic_drv) = {
.id = UCLASS_PCI_GENERIC,
.of_match = pci_generic_ids,
};
void pci_init(void)
{
struct udevice *bus;
/*
* Enumerate all known controller devices. Enumeration has the side-
* effect of probing them, so PCIe devices will be enumerated too.
*/
for (uclass_first_device(UCLASS_PCI, &bus);
bus;
uclass_next_device(&bus)) {
;
}
}