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ppc4xx: Implement is_pci_host() for 405 CPUs

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This patch implements the is_pci_host() function in a similiar way
as it is used on 440 targets.

The former path with CONFIG_PCI_HOST == PCI_HOST_AUTO does not
build on 405EP targets because checking the PCI arbiter is different.
So putting the fixed code into a separate function makes the code
more readable.

Also using is_pci_host() on 405 brings 405 and 440 PCI code
a little bit closer.

In preparation for an upcoming 405EP based PMC module I made this
function weak so that it can be overwritten from board specific code.

Signed-off-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Matthias Fuchs 2009-07-03 16:06:06 +02:00 committed by Stefan Roese
parent 04ddae915f
commit d0a1364f91
1 changed files with 16 additions and 3 deletions
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19
cpu/ppc4xx/4xx_pci.c
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@ -99,6 +99,19 @@ ushort pmc405_pci_subsys_deviceid(void);
/*#define DEBUG*/
int __is_pci_host(struct pci_controller *hose)
{
#if defined(CONFIG_405GP)
if (mfdcr(strap) & PSR_PCI_ARBIT_EN)
return 1;
#elif defined (CONFIG_405EP)
if (mfdcr(cpc0_pci) & CPC0_PCI_ARBIT_EN)
return 1;
#endif
return 0;
}
int is_pci_host(struct pci_controller *hose) __attribute__((weak, alias("__is_pci_host")));
/*-----------------------------------------------------------------------------+
* pci_init. Initializes the 405GP PCI Configuration regs.
*-----------------------------------------------------------------------------*/
@ -270,7 +283,7 @@ void pci_405gp_init(struct pci_controller *hose)
*/
pci_write_config_word(PCIDEVID_405GP, PCI_SUBSYSTEM_VENDOR_ID, CONFIG_SYS_PCI_SUBSYS_VENDORID);
#ifdef CONFIG_CPCI405
if (mfdcr(strap) & PSR_PCI_ARBIT_EN)
if (is_pci_host(hose))
pci_write_config_word(PCIDEVID_405GP, PCI_SUBSYSTEM_ID, CONFIG_SYS_PCI_SUBSYS_DEVICEID);
else
pci_write_config_word(PCIDEVID_405GP, PCI_SUBSYSTEM_ID, CONFIG_SYS_PCI_SUBSYS_DEVICEID2);
@ -295,7 +308,7 @@ void pci_405gp_init(struct pci_controller *hose)
#if (CONFIG_PCI_HOST != PCI_HOST_ADAPTER)
#if (CONFIG_PCI_HOST == PCI_HOST_AUTO)
if ((mfdcr(strap) & PSR_PCI_ARBIT_EN) ||
if (is_pci_host(hose) ||
(((s = getenv("pciscan")) != NULL) && (strcmp(s, "yes") == 0)))
#endif
{
@ -325,7 +338,7 @@ void pci_405gp_init(struct pci_controller *hose)
* Scan the PCI bus and configure devices found.
*--------------------------------------------------------------------------*/
#if (CONFIG_PCI_HOST == PCI_HOST_AUTO)
if ((mfdcr(strap) & PSR_PCI_ARBIT_EN) ||
if (is_pci_host(hose) ||
(((s = getenv("pciscan")) != NULL) && (strcmp(s, "yes") == 0)))
#endif
{