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authorGrant Likely <grant.likely@secretlab.ca>2009-01-29 17:08:41 -0700
committerGrant Likely <grant.likely@secretlab.ca>2009-01-29 17:08:41 -0700
commite489a44e2473981474fe17f17418828ba341661a (patch)
treeab28f44fbc8febc5827db61439d7b4d2c9811efa /arch/powerpc
parentd35ec494a68218d646f31d8b4f03ddd39b262a3e (diff)
powerpc/5200: Bugfix for PCI mapping of memory and IMMR
This patch ensures that memory gets properly mapped into the PCI address space. Without this patch, the memory window BAR is left at whatever value happened to be loaded into the BAR when Linux was booted. Without this patch, memory could end up getting mapped at any of the 1G address boundaries instead of at '0' where Linux expects it. Similarly, this patch also ensures that the internally memory mapped registers (IMMR) are mapped to the correct PCI address range. Without this patch, PCI appears to work correctly until a PCI device is inserted which DMAs into memory. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/52xx/mpc52xx_pci.c24
1 files changed, 10 insertions, 14 deletions
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_pci.c b/arch/powerpc/platforms/52xx/mpc52xx_pci.c
index c3f2c21024e..87ff522f28b 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_pci.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_pci.c
@@ -20,14 +20,6 @@
/* ======================================================================== */
-/* PCI windows config */
-/* ======================================================================== */
-
-#define MPC52xx_PCI_TARGET_IO 0xf0000000
-#define MPC52xx_PCI_TARGET_MEM 0x00000000
-
-
-/* ======================================================================== */
/* Structures mapping & Defines for PCI Unit */
/* ======================================================================== */
@@ -244,7 +236,7 @@ static struct pci_ops mpc52xx_pci_ops = {
static void __init
mpc52xx_pci_setup(struct pci_controller *hose,
- struct mpc52xx_pci __iomem *pci_regs)
+ struct mpc52xx_pci __iomem *pci_regs, phys_addr_t pci_phys)
{
struct resource *res;
u32 tmp;
@@ -314,10 +306,14 @@ mpc52xx_pci_setup(struct pci_controller *hose,
/* Set all the IWCR fields at once; they're in the same reg */
out_be32(&pci_regs->iwcr, MPC52xx_PCI_IWCR_PACK(iwcr0, iwcr1, iwcr2));
- out_be32(&pci_regs->tbatr0,
- MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_IO );
- out_be32(&pci_regs->tbatr1,
- MPC52xx_PCI_TBATR_ENABLE | MPC52xx_PCI_TARGET_MEM );
+ /* Map IMMR onto PCI bus */
+ pci_phys &= 0xfffc0000; /* bar0 has only 14 significant bits */
+ out_be32(&pci_regs->tbatr0, MPC52xx_PCI_TBATR_ENABLE | pci_phys);
+ out_be32(&pci_regs->bar0, PCI_BASE_ADDRESS_MEM_PREFETCH | pci_phys);
+
+ /* Map memory onto PCI bus */
+ out_be32(&pci_regs->tbatr1, MPC52xx_PCI_TBATR_ENABLE);
+ out_be32(&pci_regs->bar1, PCI_BASE_ADDRESS_MEM_PREFETCH);
out_be32(&pci_regs->tcr, MPC52xx_PCI_TCR_LD | MPC52xx_PCI_TCR_WCT8);
@@ -414,7 +410,7 @@ mpc52xx_add_bridge(struct device_node *node)
/* Finish setting up PCI using values obtained by
* pci_proces_bridge_OF_ranges */
- mpc52xx_pci_setup(hose, pci_regs);
+ mpc52xx_pci_setup(hose, pci_regs, rsrc.start);
return 0;
}