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authorMatthias Fuchs <matthias.fuchs@esd.eu>2009-07-08 13:43:55 +0200
committerStefan Roese <sr@denx.de>2009-07-10 08:26:03 +0200
commit123f102ec093fba6967066acdf9beb637df2e2d1 (patch)
tree3e5fcb229d85ccf40b66b1686242d7721195b655 /cpu/ppc4xx/4xx_pci.c
parentc71103f9dc66dfcce8ad6df942364043bf27ade8 (diff)
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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/4xx_pci.c')
-rw-r--r--cpu/ppc4xx/4xx_pci.c14
1 files changed, 14 insertions, 0 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")));