diff options
Diffstat (limited to 'cpu/ppc4xx/4xx_pci.c')
| -rw-r--r-- | cpu/ppc4xx/4xx_pci.c | 44 |
1 files changed, 39 insertions, 5 deletions
diff --git a/cpu/ppc4xx/4xx_pci.c b/cpu/ppc4xx/4xx_pci.c index 99b8e2f8824..4b5d636bd19 100644 --- a/cpu/ppc4xx/4xx_pci.c +++ b/cpu/ppc4xx/4xx_pci.c @@ -87,6 +87,20 @@ DECLARE_GLOBAL_DATA_PTR; */ int __pci_pre_init(struct pci_controller *hose) { +#if defined (CONFIG_405EP) + /* + * Enable the internal PCI arbiter by default. + * + * On 405EP CPUs the internal arbiter can be controlled + * by the I2C strapping EEPROM. If you want to do so + * or if you want to disable the arbiter pci_pre_init() + * must be reimplemented without enabling the arbiter. + * The arbiter is enabled in this place because of + * compatibility reasons. + */ + mtdcr(cpc0_pci, mfdcr(cpc0_pci) | CPC0_PCI_ARBIT_EN); +#endif /* CONFIG_405EP */ + return 1; } int pci_pre_init(struct pci_controller *hose) __attribute__((weak, alias("__pci_pre_init"))); @@ -99,6 +113,19 @@ ushort pmc405_pci_subsys_deviceid(void); /*#define DEBUG*/ +int __is_pci_host(struct pci_controller *hose) +{ +#if defined(CONFIG_405GP) + if (mfdcr(strap) & PSR_PCI_ARBIT_EN) + return 1; +#elif defined (CONFIG_405EP) + if (mfdcr(cpc0_pci) & CPC0_PCI_ARBIT_EN) + return 1; +#endif + return 0; +} +int is_pci_host(struct pci_controller *hose) __attribute__((weak, alias("__is_pci_host"))); + /*-----------------------------------------------------------------------------+ * pci_init. Initializes the 405GP PCI Configuration regs. *-----------------------------------------------------------------------------*/ @@ -270,7 +297,7 @@ void pci_405gp_init(struct pci_controller *hose) */ pci_write_config_word(PCIDEVID_405GP, PCI_SUBSYSTEM_VENDOR_ID, CONFIG_SYS_PCI_SUBSYS_VENDORID); #ifdef CONFIG_CPCI405 - if (mfdcr(strap) & PSR_PCI_ARBIT_EN) + if (is_pci_host(hose)) pci_write_config_word(PCIDEVID_405GP, PCI_SUBSYSTEM_ID, CONFIG_SYS_PCI_SUBSYS_DEVICEID); else pci_write_config_word(PCIDEVID_405GP, PCI_SUBSYSTEM_ID, CONFIG_SYS_PCI_SUBSYS_DEVICEID2); @@ -295,7 +322,7 @@ void pci_405gp_init(struct pci_controller *hose) #if (CONFIG_PCI_HOST != PCI_HOST_ADAPTER) #if (CONFIG_PCI_HOST == PCI_HOST_AUTO) - if ((mfdcr(strap) & PSR_PCI_ARBIT_EN) || + if (is_pci_host(hose) || (((s = getenv("pciscan")) != NULL) && (strcmp(s, "yes") == 0))) #endif { @@ -310,8 +337,15 @@ void pci_405gp_init(struct pci_controller *hose) } #endif -#if defined(CONFIG_405EP) /* on ppc405ep vendor id is not set */ - pci_write_config_word(PCIDEVID_405GP, PCI_VENDOR_ID, 0x1014); /* IBM */ +#if defined(CONFIG_405EP) + /* + * on ppc405ep vendor/device id is not set + * The user manual says 0x1014 (IBM) / 0x0156 (405GP!) + * are the correct values. + */ + pci_write_config_word(PCIDEVID_405GP, PCI_VENDOR_ID, PCI_VENDOR_ID_IBM); + pci_write_config_word(PCIDEVID_405GP, + PCI_DEVICE_ID, PCI_DEVICE_ID_IBM_405GP); #endif /* @@ -325,7 +359,7 @@ void pci_405gp_init(struct pci_controller *hose) * Scan the PCI bus and configure devices found. *--------------------------------------------------------------------------*/ #if (CONFIG_PCI_HOST == PCI_HOST_AUTO) - if ((mfdcr(strap) & PSR_PCI_ARBIT_EN) || + if (is_pci_host(hose) || (((s = getenv("pciscan")) != NULL) && (strcmp(s, "yes") == 0))) #endif { |