diff options
Diffstat (limited to 'arch/sh/drivers/pci/fixups-dreamcast.c')
| -rw-r--r-- | arch/sh/drivers/pci/fixups-dreamcast.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/fixups-dreamcast.c b/arch/sh/drivers/pci/fixups-dreamcast.c new file mode 100644 index 000000000..41e4daee8 --- /dev/null +++ b/arch/sh/drivers/pci/fixups-dreamcast.c @@ -0,0 +1,84 @@ +// 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, ®ion, &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; +} |