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powerpc/maple: Enable access to HT Host-Bridge on Maple 

CPC925/CPC945 use special window to access host bridge functionality of
u3-ht. Provide a way to access this device.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Dmitry Eremin-Solenikov 2011-06-29 04:17:40 +00:00 committed by Benjamin Herrenschmidt
parent 1d54cf2b97
commit f49a0c9c64
1 changed files with 55 additions and 0 deletions
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55
arch/powerpc/platforms/maple/pci.c
View File

@ -207,6 +207,54 @@ static volatile void __iomem *u3_ht_cfg_access(struct pci_controller* hose,
return hose->cfg_data + u3_ht_cfa1(bus, devfn, offset);
}
static int u3_ht_root_read_config(struct pci_controller *hose, u8 offset,
int len, u32 *val)
{
volatile void __iomem *addr;
addr = hose->cfg_addr;
addr += ((offset & ~3) << 2) + (4 - len - (offset & 3));
switch (len) {
case 1:
*val = in_8(addr);
break;
case 2:
*val = in_be16(addr);
break;
default:
*val = in_be32(addr);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int u3_ht_root_write_config(struct pci_controller *hose, u8 offset,
int len, u32 val)
{
volatile void __iomem *addr;
addr = hose->cfg_addr + ((offset & ~3) << 2) + (4 - len - (offset & 3));
if (offset >= PCI_BASE_ADDRESS_0 && offset < PCI_CAPABILITY_LIST)
return PCIBIOS_SUCCESSFUL;
switch (len) {
case 1:
out_8(addr, val);
break;
case 2:
out_be16(addr, val);
break;
default:
out_be32(addr, val);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
int offset, int len, u32 *val)
{
@ -217,6 +265,9 @@ static int u3_ht_read_config(struct pci_bus *bus, unsigned int devfn,
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
if (bus->number == hose->first_busno && devfn == PCI_DEVFN(0, 0))
return u3_ht_root_read_config(hose, offset, len, val);
if (offset > 0xff)
return PCIBIOS_BAD_REGISTER_NUMBER;
@ -252,6 +303,9 @@ static int u3_ht_write_config(struct pci_bus *bus, unsigned int devfn,
if (hose == NULL)
return PCIBIOS_DEVICE_NOT_FOUND;
if (bus->number == hose->first_busno && devfn == PCI_DEVFN(0, 0))
return u3_ht_root_write_config(hose, offset, len, val);
if (offset > 0xff)
return PCIBIOS_BAD_REGISTER_NUMBER;
@ -428,6 +482,7 @@ static void __init setup_u3_ht(struct pci_controller* hose)
* reg_property and using some accessor functions instead
*/
hose->cfg_data = ioremap(0xf2000000, 0x02000000);
hose->cfg_addr = ioremap(0xf8070000, 0x1000);
hose->first_busno = 0;
hose->last_busno = 0xef;