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83xx: PCI agent mode fixes for multi-board systems

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When running a system with 2 or more MPC8349EMDS boards in PCI agent mode,
the boards will lock up the PCI bus by scanning against each other.

The boards lock against each other by trying to access the PCI bus before
clearing their configuration lock bit. Both boards end up in a loop,
sending and receiving "Target Not Ready" messages forever.

When running in PCI agent mode, the scanning now takes place after the
boards have cleared their configuration lock bit.

Also, add a missing declaration to the mpc83xx.h header file, fixing a
build warning.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Ira Snyder 2009-01-12 13:32:26 -08:00 committed by Kim Phillips
parent 455a46915b
commit 75f35209f7
2 changed files with 6 additions and 0 deletions
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5
cpu/mpc83xx/pci.c
View file

@ -118,10 +118,12 @@ static void pci_init_bus(int bus, struct pci_region *reg)
#ifdef CONFIG_PCI_SCAN_SHOW
printf("PCI: Bus Dev VenId DevId Class Int\n");
#endif
#ifndef CONFIG_PCISLAVE
/*
* Hose scan.
*/
hose->last_busno = pci_hose_scan(hose);
#endif
}
/*
@ -190,6 +192,9 @@ void mpc83xx_pcislave_unlock(int bus)
pci_hose_read_config_word (hose, dev, PCI_FUNCTION_CONFIG, &reg16);
reg16 &= ~(PCI_FUNCTION_CFG_LOCK);
pci_hose_write_config_word (hose, dev, PCI_FUNCTION_CONFIG, reg16);
/* The configuration bit is now unlocked, so we can scan the bus */
hose->last_busno = pci_hose_scan(hose);
}
#endif

1
include/mpc83xx.h
View file

@ -1173,6 +1173,7 @@
#ifndef __ASSEMBLY__
struct pci_region;
void mpc83xx_pci_init(int num_buses, struct pci_region **reg, int warmboot);
void mpc83xx_pcislave_unlock(int bus);
#endif
#endif /* __MPC83XX_H__ */