ppc4xx: (Re-)Enable CONFIG_PCI_PNP on AMCC 440EPx Sequoia
The 440EPx has a problem when the PCI_CACHE_LINE_SIZE register is
set to non-zero, because it doesn't support MRM (memory-read-
multiple) correctly. We now added the possibility to configure
this register in the board config file, so that the default value
of 8 can be overridden.
Here the details of this patch:
o drivers_pci_auto.c: introduce CFG_PCI_CACHE_LINE_SIZE to allow
board-specific settings. As an example the sequoia board requires 0.
Idea from Stefan Roese <sr@denx.de>.
o board/amcc/sequoia/init.S: add a TLB mapping at 0xE8000000 for the
PCI IO-space. Obtained from Stefan Roese <sr@denx.de>.
o include/configs/sequoia.h: turn CONFIG_PCI_PNP back on and set
CFG_PCI_CACHE_LINE_SIZE to 0.
Signed-off-by: Gary Jennejohn <garyj@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/pci_auto.c b/drivers/pci_auto.c
index 2378553..acfda83 100644
--- a/drivers/pci_auto.c
+++ b/drivers/pci_auto.c
@@ -28,6 +28,11 @@
#define PCIAUTO_IDE_MODE_MASK 0x05
+/* the user can define CFG_PCI_CACHE_LINE_SIZE to avoid problems */
+#ifndef CFG_PCI_CACHE_LINE_SIZE
+#define CFG_PCI_CACHE_LINE_SIZE 8
+#endif
+
/*
*
*/
@@ -150,7 +155,8 @@
}
pci_hose_write_config_dword(hose, dev, PCI_COMMAND, cmdstat);
- pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE, 0x08);
+ pci_hose_write_config_byte(hose, dev, PCI_CACHE_LINE_SIZE,
+ CFG_PCI_CACHE_LINE_SIZE);
pci_hose_write_config_byte(hose, dev, PCI_LATENCY_TIMER, 0x80);
}