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powerpc/5200: Bugfix for PCI mapping of memory and IMMR

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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>
This commit is contained in:
Grant Likely 2009-01-29 17:08:41 -07:00
parent d35ec494a6
commit e489a44e24
1 changed files with 10 additions and 14 deletions
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24
arch/powerpc/platforms/52xx/mpc52xx_pci.c
View file

@ -19,14 +19,6 @@
#include <linux/kernel.h>
/* ======================================================================== */
/* 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;
}