148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <asm/bootinfo.h>
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#include <asm/lasat/lasat.h>
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#include <asm/gt64120.h>
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#include <asm/nile4.h>
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#define PCI_ACCESS_READ 0
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#define PCI_ACCESS_WRITE 1
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#define LO(reg) (reg / 4)
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#define HI(reg) (reg / 4 + 1)
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volatile unsigned long *const vrc_pciregs = (void *) Vrc5074_BASE;
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static DEFINE_SPINLOCK(nile4_pci_lock);
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static int nile4_pcibios_config_access(unsigned char access_type,
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struct pci_bus *bus, unsigned int devfn, int where, u32 *val)
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{
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unsigned char busnum = bus->number;
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u32 adr, mask, err;
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if ((busnum == 0) && (PCI_SLOT(devfn) > 8))
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/* The addressing scheme chosen leaves room for just
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* 8 devices on the first busnum (besides the PCI
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* controller itself) */
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return PCIBIOS_DEVICE_NOT_FOUND;
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if ((busnum == 0) && (devfn == PCI_DEVFN(0, 0))) {
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/* Access controller registers directly */
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if (access_type == PCI_ACCESS_WRITE) {
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vrc_pciregs[(0x200 + where) >> 2] = *val;
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} else {
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*val = vrc_pciregs[(0x200 + where) >> 2];
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}
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return PCIBIOS_SUCCESSFUL;
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}
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/* Temporarily map PCI Window 1 to config space */
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mask = vrc_pciregs[LO(NILE4_PCIINIT1)];
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vrc_pciregs[LO(NILE4_PCIINIT1)] = 0x0000001a | (busnum ? 0x200 : 0);
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/* Clear PCI Error register. This also clears the Error Type
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* bits in the Control register */
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vrc_pciregs[LO(NILE4_PCIERR)] = 0;
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vrc_pciregs[HI(NILE4_PCIERR)] = 0;
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/* Setup address */
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if (busnum == 0)
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adr =
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KSEG1ADDR(PCI_WINDOW1) +
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((1 << (PCI_SLOT(devfn) + 15)) | (PCI_FUNC(devfn) << 8)
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| (where & ~3));
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else
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adr = KSEG1ADDR(PCI_WINDOW1) | (busnum << 16) | (devfn << 8) |
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(where & ~3);
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if (access_type == PCI_ACCESS_WRITE)
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*(u32 *) adr = *val;
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else
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*val = *(u32 *) adr;
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/* Check for master or target abort */
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err = (vrc_pciregs[HI(NILE4_PCICTRL)] >> 5) & 0x7;
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/* Restore PCI Window 1 */
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vrc_pciregs[LO(NILE4_PCIINIT1)] = mask;
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if (err)
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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static int nile4_pcibios_read(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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unsigned long flags;
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u32 data = 0;
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int err;
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if ((size == 2) && (where & 1))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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else if ((size == 4) && (where & 3))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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spin_lock_irqsave(&nile4_pci_lock, flags);
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err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
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&data);
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spin_unlock_irqrestore(&nile4_pci_lock, flags);
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if (err)
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return err;
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if (size == 1)
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*val = (data >> ((where & 3) << 3)) & 0xff;
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else if (size == 2)
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*val = (data >> ((where & 3) << 3)) & 0xffff;
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else
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*val = data;
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return PCIBIOS_SUCCESSFUL;
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}
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static int nile4_pcibios_write(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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unsigned long flags;
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u32 data = 0;
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int err;
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if ((size == 2) && (where & 1))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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else if ((size == 4) && (where & 3))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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spin_lock_irqsave(&nile4_pci_lock, flags);
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err = nile4_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
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&data);
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spin_unlock_irqrestore(&nile4_pci_lock, flags);
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if (err)
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return err;
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if (size == 1)
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data = (data & ~(0xff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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else if (size == 2)
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data = (data & ~(0xffff << ((where & 3) << 3))) |
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(val << ((where & 3) << 3));
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else
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data = val;
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if (nile4_pcibios_config_access
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(PCI_ACCESS_WRITE, bus, devfn, where, &data))
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return -1;
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops nile4_pci_ops = {
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.read = nile4_pcibios_read,
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.write = nile4_pcibios_write,
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};
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