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pci: move pcidelay code to new location just before PCI bus scan

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PCI cards might need some time after reset to respond. On some
boards (mpc5200 or mpc8260 based) the PCI bus reset is deasserted
at pci_init_board() time, so we currently can not use available
"pcidelay" option for waiting before PCI bus scan since this
waiting takes place before calling pci_init_board(). By moving
the pcidelay code to the new location using of the "pcidelay"
option is possible on mpc5200 or mpc8260 based boards, too.

Since pci_hose_scan() could be called multiple times, restrict
the function to wait only during its first call and to ignore
pcidelay for any further call (as pointed out by Matthias).

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Matthias Fuchs <matthias.fuchs@esd.eu>
Acked-by: Stefan Roese <sr@denx.de>
Acked-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Tested-by: Matthias Fuchs <matthias.fuchs@esd.eu>
This commit is contained in:
Anatolij Gustschin 2011-10-11 22:44:30 +00:00 committed by Wolfgang Denk
parent 4f1ec4c176
commit 0da1fb03c5
1 changed files with 17 additions and 13 deletions
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30
drivers/pci/pci.c
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@ -695,6 +695,23 @@ int pci_hose_scan_bus(struct pci_controller *hose, int bus)
int pci_hose_scan(struct pci_controller *hose)
{
#if defined(CONFIG_PCI_BOOTDELAY)
static int pcidelay_done;
char *s;
int i;
if (!pcidelay_done) {
/* wait "pcidelay" ms (if defined)... */
s = getenv("pcidelay");
if (s) {
int val = simple_strtoul(s, NULL, 10);
for (i = 0; i < val; i++)
udelay(1000);
}
pcidelay_done = 1;
}
#endif /* CONFIG_PCI_BOOTDELAY */
/* Start scan at current_busno.
* PCIe will start scan at first_busno+1.
*/
@ -709,19 +726,6 @@ int pci_hose_scan(struct pci_controller *hose)
void pci_init(void)
{
#if defined(CONFIG_PCI_BOOTDELAY)
char *s;
int i;
/* wait "pcidelay" ms (if defined)... */
s = getenv ("pcidelay");
if (s) {
int val = simple_strtoul (s, NULL, 10);
for (i=0; i<val; i++)
udelay (1000);
}
#endif /* CONFIG_PCI_BOOTDELAY */
hose_head = NULL;
/* now call board specific pci_init()... */