mirror of https://gitee.com/openkylin/linux.git
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2000, 2001 Keith M Wesolowski
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*/
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/types.h>
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#include <asm/pci.h>
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#include <asm/ip32/mace.h>
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#if 0
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# define DPRINTK(args...) printk(args);
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#else
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# define DPRINTK(args...)
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#endif
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/*
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* O2 has up to 5 PCI devices connected into the MACE bridge. The device
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* map looks like this:
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*
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* 0 aic7xxx 0
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* 1 aic7xxx 1
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* 2 expansion slot
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* 3 N/C
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* 4 N/C
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*/
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static inline int mkaddr(struct pci_bus *bus, unsigned int devfn,
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unsigned int reg)
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{
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return ((bus->number & 0xff) << 16) |
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((devfn & 0xff) << 8) |
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(reg & 0xfc);
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}
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static int
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mace_pci_read_config(struct pci_bus *bus, unsigned int devfn,
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int reg, int size, u32 *val)
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{
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u32 control = mace->pci.control;
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/* disable master aborts interrupts during config read */
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mace->pci.control = control & ~MACEPCI_CONTROL_MAR_INT;
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mace->pci.config_addr = mkaddr(bus, devfn, reg);
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switch (size) {
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case 1:
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*val = mace->pci.config_data.b[(reg & 3) ^ 3];
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break;
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case 2:
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*val = mace->pci.config_data.w[((reg >> 1) & 1) ^ 1];
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break;
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case 4:
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*val = mace->pci.config_data.l;
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break;
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}
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/* ack possible master abort */
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mace->pci.error &= ~MACEPCI_ERROR_MASTER_ABORT;
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mace->pci.control = control;
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/*
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* someone forgot to set the ultra bit for the onboard
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* scsi chips; we fake it here
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*/
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if (bus->number == 0 && reg == 0x40 && size == 4 &&
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(devfn == (1 << 3) || devfn == (2 << 3)))
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*val |= 0x1000;
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DPRINTK("read%d: reg=%08x,val=%02x\n", size * 8, reg, *val);
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return PCIBIOS_SUCCESSFUL;
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}
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static int
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mace_pci_write_config(struct pci_bus *bus, unsigned int devfn,
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int reg, int size, u32 val)
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{
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mace->pci.config_addr = mkaddr(bus, devfn, reg);
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switch (size) {
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case 1:
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mace->pci.config_data.b[(reg & 3) ^ 3] = val;
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break;
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case 2:
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mace->pci.config_data.w[((reg >> 1) & 1) ^ 1] = val;
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break;
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case 4:
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mace->pci.config_data.l = val;
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break;
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}
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DPRINTK("write%d: reg=%08x,val=%02x\n", size * 8, reg, val);
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops mace_pci_ops = {
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.read = mace_pci_read_config,
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.write = mace_pci_write_config,
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};
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