pci-dc.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:5k
- /*
- $ $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%lxn", (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 %sn", 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;
- }