diff options
Diffstat (limited to 'arch/powerpc/platforms/85xx/mpc85xx_cds.c')
| -rw-r--r-- | arch/powerpc/platforms/85xx/mpc85xx_cds.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c index 81b70628df7..e77c869d391 100644 --- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c +++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c @@ -69,6 +69,37 @@ static int mpc85xx_exclude_device(struct pci_controller *hose, return PCIBIOS_SUCCESSFUL; } +static void mpc85xx_cds_restart(char *cmd) +{ + struct pci_dev *dev; + u_char tmp; + + if ((dev = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, + NULL))) { + + /* Use the VIA Super Southbridge to force a PCI reset */ + pci_read_config_byte(dev, 0x47, &tmp); + pci_write_config_byte(dev, 0x47, tmp | 1); + + /* Flush the outbound PCI write queues */ + pci_read_config_byte(dev, 0x47, &tmp); + + /* + * At this point, the harware reset should have triggered. + * However, if it doesn't work for some mysterious reason, + * just fall through to the default reset below. + */ + + pci_dev_put(dev); + } + + /* + * If we can't find the VIA chip (maybe the P2P bridge is disabled) + * or the VIA chip reset didn't work, just use the default reset. + */ + mpc85xx_restart(NULL); +} + static void __init mpc85xx_cds_pci_irq_fixup(struct pci_dev *dev) { u_char c; @@ -304,7 +335,11 @@ define_machine(mpc85xx_cds) { .init_IRQ = mpc85xx_cds_pic_init, .show_cpuinfo = mpc85xx_cds_show_cpuinfo, .get_irq = mpic_get_irq, +#ifdef CONFIG_PCI + .restart = mpc85xx_cds_restart, +#else .restart = mpc85xx_restart, +#endif .calibrate_decr = generic_calibrate_decr, .progress = udbg_progress, .pcibios_fixup_bus = fsl_pcibios_fixup_bus, |