Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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, &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;
+}