Viewing file:  pci-dc.c (4.8 KB) -rw-r--r--
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/*
$ $Id: pci-dc.c,v 1.5 2001/08/24 12:38:19 dwmw2 Exp $
* Dreamcast PCI: Supports SEGA Broadband Adaptor only.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/dc_sysasic.h>
#define GAPSPCI_REGS 0x01001400
#define GAPSPCI_DMA_BASE 0x01840000
#define GAPSPCI_DMA_SIZE 32768
#define GAPSPCI_BBA_CONFIG 0x01001600
#define GAPSPCI_IRQ HW_EVENT_EXTERNAL
static int gapspci_dma_used;
static struct pci_bus *pci_root_bus;
struct pci_fixup pcibios_fixups[] = {
{0, 0, 0, NULL}
};
#define BBA_SELECTED(dev) (dev->bus->number==0 && dev->devfn==0)
static int gapspci_read_config_byte(struct pci_dev *dev, int where,
u8 * val)
{
if (BBA_SELECTED(dev))
*val = inb(GAPSPCI_BBA_CONFIG+where);
else
*val = 0xff;
return PCIBIOS_SUCCESSFUL;
}
static int gapspci_read_config_word(struct pci_dev *dev, int where,
u16 * val)
{
if (BBA_SELECTED(dev))
*val = inw(GAPSPCI_BBA_CONFIG+where);
else
*val = 0xffff;
return PCIBIOS_SUCCESSFUL;
}
static int gapspci_read_config_dword(struct pci_dev *dev, int where,
u32 * val)
{
if (BBA_SELECTED(dev))
*val = inl(GAPSPCI_BBA_CONFIG+where);
else
*val = 0xffffffff;
return PCIBIOS_SUCCESSFUL;
}
static int gapspci_write_config_byte(struct pci_dev *dev, int where,
u8 val)
{
if (BBA_SELECTED(dev))
outb(val, GAPSPCI_BBA_CONFIG+where);
return PCIBIOS_SUCCESSFUL;
}
static int gapspci_write_config_word(struct pci_dev *dev, int where,
u16 val)
{
if (BBA_SELECTED(dev))
outw(val, GAPSPCI_BBA_CONFIG+where);
return PCIBIOS_SUCCESSFUL;
}
static int gapspci_write_config_dword(struct pci_dev *dev, int where,
u32 val)
{
if (BBA_SELECTED(dev))
outl(val, GAPSPCI_BBA_CONFIG+where);
return PCIBIOS_SUCCESSFUL;
}
static struct pci_ops pci_config_ops = {
gapspci_read_config_byte,
gapspci_read_config_word,
gapspci_read_config_dword,
gapspci_write_config_byte,
gapspci_write_config_word,
gapspci_write_config_dword
};
void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
dma_addr_t * dma_handle)
{
unsigned long buf;
if (gapspci_dma_used+size > GAPSPCI_DMA_SIZE)
return NULL;
buf = GAPSPCI_DMA_BASE+gapspci_dma_used;
gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
printk("pci_alloc_consistent: %ld bytes at 0x%lx\n", (long)size, buf);
*dma_handle = (dma_addr_t)buf;
return (void *)P2SEGADDR(buf);
}
void pci_free_consistent(struct pci_dev *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
/* XXX */
gapspci_dma_used = 0;
}
void __init pcibios_fixup_pbus_ranges(struct pci_bus *bus, struct pbus_set_ranges_data *ranges)
{
}
void __init pcibios_fixup_bus(struct pci_bus *bus)
{
struct list_head *ln;
struct pci_dev *dev;
for (ln=bus->devices.next; ln != &bus->devices; ln=ln->next) {
dev = pci_dev_b(ln);
if (!BBA_SELECTED(dev)) continue;
printk("PCI: MMIO fixup to %s\n", dev->name);
dev->resource[1].start=0x01001700;
dev->resource[1].end=0x010017ff;
}
}
static u8 __init no_swizzle(struct pci_dev *dev, u8 * pin)
{
return PCI_SLOT(dev->devfn);
}
static int __init map_dc_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
return GAPSPCI_IRQ;
}
void __init pcibios_init(void)
{
pci_root_bus = pci_scan_bus(0, &pci_config_ops, NULL);
/* pci_assign_unassigned_resources(); */
pci_fixup_irqs(no_swizzle, map_dc_irq);
}
/* Haven't done anything here as yet */
char * __init pcibios_setup(char *str)
{
return str;
}
int __init gapspci_init(void)
{
int i;
char idbuf[16];
for(i=0; i<16; i++)
idbuf[i]=inb(GAPSPCI_REGS+i);
if(strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
return -1;
outl(0x5a14a501, GAPSPCI_REGS+0x18);
for(i=0; i<1000000; i++);
if(inl(GAPSPCI_REGS+0x18)!=1)
return -1;
outl(0x01000000, GAPSPCI_REGS+0x20);
outl(0x01000000, GAPSPCI_REGS+0x24);
outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
outl(1, GAPSPCI_REGS+0x14);
outl(1, GAPSPCI_REGS+0x34);
gapspci_dma_used=0;
/* Setting Broadband Adapter */
outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
return 0;
}
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