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[POWERPC] Add a helper for calculating RTAS "config_addr" parameters

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Several RTAS calls take a "config_addr" parameter, which is a particular
way of specifying a PCI busno, devfn and register number into a 32-bit word.
Currently these are open-coded, and I'll be adding another soon, replace
them with a helper that encapsulates the logic. Be more strict about masking
the busno too, just in case.

Booted on P5 LPAR.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2006-08-16 22:04:14 +10:00 • committed by Paul Mackerras
parent a0a428e300
commit 6f3d5d3cc4
2 changed files with 18 additions and 4 deletions
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6
arch/powerpc/kernel/rtas_pci.c
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@ -81,8 +81,7 @@ int rtas_read_config(struct pci_dn *pdn, int where, int size, u32 *val)
if (!config_access_valid(pdn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
(pdn->devfn << 8) | (where & 0xff);
addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
buid = pdn->phb->buid;
if (buid) {
ret = rtas_call(ibm_read_pci_config, 4, 2, &returnval,
@ -134,8 +133,7 @@ int rtas_write_config(struct pci_dn *pdn, int where, int size, u32 val)
if (!config_access_valid(pdn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
addr = ((where & 0xf00) << 20) | (pdn->busno << 16) |
(pdn->devfn << 8) | (where & 0xff);
addr = rtas_config_addr(pdn->busno, pdn->devfn, where);
buid = pdn->phb->buid;
if (buid) {
ret = rtas_call(ibm_write_pci_config, 5, 1, NULL, addr,