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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* SNI specific PCI support for RM200/RM300.
*
* Copyright (C) 1997 - 2000 Ralf Baechle
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/sni.h>
#ifdef CONFIG_PCI
#define mkaddr(dev, where) \
do { \
if ((dev)->bus->number == 0) \
return -1; \
*(volatile u32 *)PCIMT_CONFIG_ADDRESS = \
((dev->bus->number & 0xff) << 0x10) | \
((dev->devfn & 0xff) << 0x08) | \
(where & 0xfc); \
} while(0);
#if 0
/* To do: Bring this uptodate ... */
static void pcimt_pcibios_fixup (void)
{
struct pci_dev *dev;
pci_for_each_dev(dev) {
/*
* TODO: Take care of RM300 revision D boards for where the
* network slot became an ordinary PCI slot.
*/
if (dev->devfn == PCI_DEVFN(1, 0)) {
/* Evil hack ... */
set_cp0_config(CONF_CM_CMASK, CONF_CM_CACHABLE_NO_WA);
dev->irq = PCIMT_IRQ_SCSI;
continue;
}
if (dev->devfn == PCI_DEVFN(2, 0)) {
dev->irq = PCIMT_IRQ_ETHERNET;
continue;
}
switch(dev->irq) {
case 1 ... 4:
dev->irq += PCIMT_IRQ_INTA - 1;
break;
case 0:
break;
default:
printk("PCI device on bus %d, dev %d, function %d "
"impossible interrupt configured.\n",
dev->bus->number, PCI_SLOT(dev->devfn),
PCI_SLOT(dev->devfn));
}
}
}
#endif
/*
* We can't address 8 and 16 bit words directly. Instead we have to
* read/write a 32bit word and mask/modify the data we actually want.
*/
static int pcimt_read_config_byte (struct pci_dev *dev,
int where, unsigned char *val)
{
u32 res;
mkaddr(dev, where);
res = *(volatile u32 *)PCIMT_CONFIG_DATA;
res = (le32_to_cpu(res) >> ((where & 3) << 3)) & 0xff;
*val = res;
return PCIBIOS_SUCCESSFUL;
}
static int pcimt_read_config_word (struct pci_dev *dev,
int where, unsigned short *val)
{
u32 res;
if (where & 1)
return PCIBIOS_BAD_REGISTER_NUMBER;
mkaddr(dev, where);
res = *(volatile u32 *)PCIMT_CONFIG_DATA;
res = (le32_to_cpu(res) >> ((where & 3) << 3)) & 0xffff;
*val = res;
return PCIBIOS_SUCCESSFUL;
}
static int pcimt_read_config_dword (struct pci_dev *dev,
int where, unsigned int *val)
{
u32 res;
if (where & 3)
return PCIBIOS_BAD_REGISTER_NUMBER;
mkaddr(dev, where);
res = *(volatile u32 *)PCIMT_CONFIG_DATA;
res = le32_to_cpu(res);
*val = res;
return PCIBIOS_SUCCESSFUL;
}
static int pcimt_write_config_byte (struct pci_dev *dev,
int where, unsigned char val)
{
mkaddr(dev, where);
*(volatile u8 *)(PCIMT_CONFIG_DATA + (where & 3)) = val;
return PCIBIOS_SUCCESSFUL;
}
static int pcimt_write_config_word (struct pci_dev *dev,
int where, unsigned short val)
{
if (where & 1)
return PCIBIOS_BAD_REGISTER_NUMBER;
mkaddr(dev, where);
*(volatile u16 *)(PCIMT_CONFIG_DATA + (where & 3)) = le16_to_cpu(val);
return PCIBIOS_SUCCESSFUL;
}
static int pcimt_write_config_dword (struct pci_dev *dev,
int where, unsigned int val)
{
if (where & 3)
return PCIBIOS_BAD_REGISTER_NUMBER;
mkaddr(dev, where);
*(volatile u32 *)PCIMT_CONFIG_DATA = le32_to_cpu(val);
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops sni_pci_ops = {
pcimt_read_config_byte,
pcimt_read_config_word,
pcimt_read_config_dword,
pcimt_write_config_byte,
pcimt_write_config_word,
pcimt_write_config_dword
};
void __init
pcibios_fixup_bus(struct pci_bus *b)
{
}
void
pcibios_update_resource(struct pci_dev *dev, struct resource *root,
struct resource *res, int resource)
{
u32 new, check;
int reg;
new = res->start | (res->flags & PCI_REGION_FLAG_MASK);
if (resource < 6) {
reg = PCI_BASE_ADDRESS_0 + 4*resource;
} else if (resource == PCI_ROM_RESOURCE) {
res->flags |= PCI_ROM_ADDRESS_ENABLE;
new |= PCI_ROM_ADDRESS_ENABLE;
reg = dev->rom_base_reg;
} else {
/* Somebody might have asked allocation of a non-standard resource */
return;
}
pci_write_config_dword(dev, reg, new);
pci_read_config_dword(dev, reg, &check);
if ((new ^ check) & ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK)) {
printk(KERN_ERR "PCI: Error while updating region "
"%s/%d (%08x != %08x)\n", dev->slot_name, resource,
new, check);
}
}
void __init pcibios_init(void)
{
struct pci_ops *ops = &sni_pci_ops;
pci_scan_bus(0, ops, NULL);
}
int __init pcibios_enable_device(struct pci_dev *dev)
{
/* Not needed, since we enable all devices at startup. */
return 0;
}
void __init
pcibios_align_resource(void *data, struct resource *res, unsigned long size)
{
}
unsigned __init int pcibios_assign_all_busses(void)
{
return 0;
}
char * __init
pcibios_setup(char *str)
{
/* Nothing to do for now. */
return str;
}
struct pci_fixup pcibios_fixups[] = {
{ 0 }
};
#endif /* CONFIG_PCI */
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