// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/drivers/pci/fixups-dreamcast.c
 *
 * PCI fixups for the Sega Dreamcast
 *
 * Copyright (C) 2001, 2002  M. R. Brown
 * Copyright (C) 2002, 2003, 2006  Paul Mundt
 *
 * This file originally bore the message (with enclosed-$):
 *      Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
 *      Dreamcast PCI: Supports SEGA Broadband Adaptor only.
 */

#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 <linux/dma-map-ops.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <mach/pci.h>

static void gapspci_fixup_resources(struct pci_dev *dev)
{
        struct pci_channel *p = dev->sysdata;
        struct resource res;
        struct pci_bus_region region;

        printk(KERN_NOTICE "PCI: Fixing up device %s\n", pci_name(dev));

        switch (dev->device) {
        case PCI_DEVICE_ID_SEGA_BBA:
                /*
                 * We also assume that dev->devfn == 0
                 */
                dev->resource[1].start  = p->resources[0].start  + 0x100;
                dev->resource[1].end    = dev->resource[1].start + 0x200 - 1;

                /*
                 * This is not a normal BAR, prevent any attempts to move
                 * the BAR, as this will result in a bus lock.
                 */
                dev->resource[1].flags |= IORESOURCE_PCI_FIXED;

                /*
                 * Redirect dma memory allocations to special memory window.
                 *
                 * If this GAPSPCI region were mapped by a BAR, the CPU
                 * phys_addr_t would be pci_resource_start(), and the bus
                 * address would be pci_bus_address(pci_resource_start()).
                 * But apparently there's no BAR mapping it, so we just
                 * "know" its CPU address is GAPSPCI_DMA_BASE.
                 */
                res.start = GAPSPCI_DMA_BASE;
                res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1;
                res.flags = IORESOURCE_MEM;
                pcibios_resource_to_bus(dev->bus, &region, &res);
                BUG_ON(dma_declare_coherent_memory(&dev->dev,
                                                res.start,
                                                region.start,
                                                resource_size(&res)));
                break;
        default:
                printk("PCI: Failed resource fixup\n");
        }
}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, gapspci_fixup_resources);

int pcibios_map_platform_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
        /*
         * The interrupt routing semantics here are quite trivial.
         *
         * We basically only support one interrupt, so we only bother
         * updating a device's interrupt line with this single shared
         * interrupt. Keeps routing quite simple, doesn't it?
         */
        return GAPSPCI_IRQ;
}