1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
/*
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* arch/sh/pci/ops-dreamcast.c
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*
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* PCI operations for the Sega Dreamcast
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*
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* Copyright (C) 2001, 2002 M. R. Brown
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* Copyright (C) 2002, 2003 Paul Mundt
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*
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* This file originally bore the message (with enclosed-$):
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* Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
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* Dreamcast PCI: Supports SEGA Broadband Adaptor only.
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*
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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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#include <linux/config.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/param.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/pci.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/mach/pci.h>
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static struct resource gapspci_io_resource = {
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.name = "GAPSPCI IO",
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.start = GAPSPCI_BBA_CONFIG,
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.end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
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.flags = IORESOURCE_IO,
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};
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static struct resource gapspci_mem_resource = {
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.name = "GAPSPCI mem",
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.start = GAPSPCI_DMA_BASE,
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.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
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.flags = IORESOURCE_MEM,
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};
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static struct pci_ops gapspci_pci_ops;
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struct pci_channel board_pci_channels[] = {
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{ &gapspci_pci_ops, &gapspci_io_resource,
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&gapspci_mem_resource, 0, 1 },
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{ 0, }
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};
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/*
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* The !gapspci_config_access case really shouldn't happen, ever, unless
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* someone implicitly messes around with the last devfn value.. otherwise we
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* only support a single device anyways, and if we didn't have a BBA, we
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* wouldn't make it terribly far through the PCI setup anyways.
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*
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* Also, we could very easily support both Type 0 and Type 1 configurations
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* here, but since it doesn't seem that there is any such implementation in
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* existance, we don't bother.
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*
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* I suppose if someone actually gets around to ripping the chip out of
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* the BBA and hanging some more devices off of it, then this might be
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* something to take into consideration. However, due to the cost of the BBA,
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* and the general lack of activity by DC hardware hackers, this doesn't seem
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* likely to happen anytime soon.
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*/
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static int gapspci_config_access(unsigned char bus, unsigned int devfn)
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{
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return (bus == 0) && (devfn == 0);
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}
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/*
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* We can also actually read and write in b/w/l sizes! Thankfully this part
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* was at least done right, and we don't have to do the stupid masking and
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* shifting that we do on the 7751! Small wonders never cease to amaze.
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*/
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static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val)
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{
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*val = 0xffffffff;
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if (!gapspci_config_access(bus->number, devfn))
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return PCIBIOS_DEVICE_NOT_FOUND;
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switch (size) {
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case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break;
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case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break;
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case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
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{
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if (!gapspci_config_access(bus->number, devfn))
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return PCIBIOS_DEVICE_NOT_FOUND;
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switch (size) {
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case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break;
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case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break;
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case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break;
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}
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return PCIBIOS_SUCCESSFUL;
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}
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static struct pci_ops gapspci_pci_ops = {
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.read = gapspci_read,
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.write = gapspci_write,
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};
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/*
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* gapspci init
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*/
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int __init gapspci_init(void)
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{
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char idbuf[16];
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int i;
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/*
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* FIXME: All of this wants documenting to some degree,
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* even some basic register definitions would be nice.
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*
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* I haven't seen anything this ugly since.. maple.
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*/
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for (i=0; i<16; i++)
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idbuf[i] = inb(GAPSPCI_REGS+i);
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if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
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return -ENODEV;
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outl(0x5a14a501, GAPSPCI_REGS+0x18);
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for (i=0; i<1000000; i++)
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;
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if (inl(GAPSPCI_REGS+0x18) != 1)
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return -EINVAL;
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outl(0x01000000, GAPSPCI_REGS+0x20);
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outl(0x01000000, GAPSPCI_REGS+0x24);
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outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
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outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
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outl(1, GAPSPCI_REGS+0x14);
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outl(1, GAPSPCI_REGS+0x34);
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/* Setting Broadband Adapter */
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outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
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outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
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outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
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outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
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outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
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outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
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outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
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return 0;
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}
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/* Haven't done anything here as yet */
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char * __devinit pcibios_setup(char *str)
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{
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return str;
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}
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