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| author | Matthias Fuchs <matthias.fuchs@esd.eu> | 2009-07-08 13:43:55 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2009-07-10 08:26:03 +0200 |
| commit | 123f102ec093fba6967066acdf9beb637df2e2d1 (patch) | |
| tree | 3e5fcb229d85ccf40b66b1686242d7721195b655 /cpu/ppc4xx | |
| parent | c71103f9dc66dfcce8ad6df942364043bf27ade8 (diff) | |
| download | u-boot-imx-123f102ec093fba6967066acdf9beb637df2e2d1.zip u-boot-imx-123f102ec093fba6967066acdf9beb637df2e2d1.tar.gz u-boot-imx-123f102ec093fba6967066acdf9beb637df2e2d1.tar.bz2 | |
ppc4xx: Move 405EP pci code from cpu_init_f() to __pci_pre_init()
This patch moves some basic PCI initialisation from the 4xx cpu_init_f()
to cpu/ppc4xx/4xx_pci.c.
The original cpu_init_f() function enabled the 405EP's internal arbiter
in all situations. Also the HCE bit in cpc0_pci is always set.
The first is not really wanted for PCI adapter designs and the latter
is a general bug for PCI adapter U-Boots. Because it enables
PCI configuration by the system CPU even when the PCI configuration has
not been setup by the 405EP. The one and only correct place is
in pci_405gp_init() (see "Set HCE bit" comment).
So for compatibility reasons the arbiter is still enabled in any case,
but from weak pci_pre_init() so that it can be replaced by board specific
code.
Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'cpu/ppc4xx')
| -rw-r--r-- | cpu/ppc4xx/4xx_pci.c | 14 | ||||
| -rw-r--r-- | cpu/ppc4xx/cpu_init.c | 5 |
2 files changed, 14 insertions, 5 deletions
diff --git a/cpu/ppc4xx/4xx_pci.c b/cpu/ppc4xx/4xx_pci.c index 31ca85d..33dd743 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"))); diff --git a/cpu/ppc4xx/cpu_init.c b/cpu/ppc4xx/cpu_init.c index 577d33f..bbd795d 100644 --- a/cpu/ppc4xx/cpu_init.c +++ b/cpu/ppc4xx/cpu_init.c @@ -174,11 +174,6 @@ cpu_init_f (void) * Set EMAC noise filter bits */ mtdcr(cpc0_epctl, CPC0_EPRCSR_E0NFE | CPC0_EPRCSR_E1NFE); - - /* - * Enable the internal PCI arbiter - */ - mtdcr(cpc0_pci, mfdcr(cpc0_pci) | CPC0_PCI_HOST_CFG_EN | CPC0_PCI_ARBIT_EN); #endif /* CONFIG_405EP */ #if defined(CONFIG_SYS_4xx_GPIO_TABLE) |