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Diffstat (limited to 'arch/sh/drivers/pci/pci-dreamcast.c')
-rw-r--r--arch/sh/drivers/pci/pci-dreamcast.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/sh/drivers/pci/pci-dreamcast.c b/arch/sh/drivers/pci/pci-dreamcast.c
new file mode 100644
index 000000000..4cff2a810
--- /dev/null
+++ b/arch/sh/drivers/pci/pci-dreamcast.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI support for the Sega Dreamcast
+ *
+ * Copyright (C) 2001, 2002 M. R. Brown
+ * Copyright (C) 2002, 2003 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/module.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <mach/pci.h>
+
+static struct resource gapspci_resources[] = {
+ {
+ .name = "GAPSPCI IO",
+ .start = GAPSPCI_BBA_CONFIG,
+ .end = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
+ .flags = IORESOURCE_IO,
+ }, {
+ .name = "GAPSPCI mem",
+ .start = GAPSPCI_DMA_BASE,
+ .end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
+ .flags = IORESOURCE_MEM,
+ },
+};
+
+static struct pci_channel dreamcast_pci_controller = {
+ .pci_ops = &gapspci_pci_ops,
+ .resources = gapspci_resources,
+ .nr_resources = ARRAY_SIZE(gapspci_resources),
+ .io_offset = 0x00000000,
+ .mem_offset = 0x00000000,
+};
+
+/*
+ * gapspci init
+ */
+
+static int __init gapspci_init(void)
+{
+ char idbuf[16];
+ int i;
+
+ /*
+ * FIXME: All of this wants documenting to some degree,
+ * even some basic register definitions would be nice.
+ *
+ * I haven't seen anything this ugly since.. maple.
+ */
+
+ for (i=0; i<16; i++)
+ idbuf[i] = inb(GAPSPCI_REGS+i);
+
+ if (strncmp(idbuf, "GAPSPCI_BRIDGE_2", 16))
+ return -ENODEV;
+
+ outl(0x5a14a501, GAPSPCI_REGS+0x18);
+
+ for (i=0; i<1000000; i++)
+ cpu_relax();
+
+ if (inl(GAPSPCI_REGS+0x18) != 1)
+ return -EINVAL;
+
+ outl(0x01000000, GAPSPCI_REGS+0x20);
+ outl(0x01000000, GAPSPCI_REGS+0x24);
+
+ outl(GAPSPCI_DMA_BASE, GAPSPCI_REGS+0x28);
+ outl(GAPSPCI_DMA_BASE+GAPSPCI_DMA_SIZE, GAPSPCI_REGS+0x2c);
+
+ outl(1, GAPSPCI_REGS+0x14);
+ outl(1, GAPSPCI_REGS+0x34);
+
+ /* Setting Broadband Adapter */
+ outw(0xf900, GAPSPCI_BBA_CONFIG+0x06);
+ outl(0x00000000, GAPSPCI_BBA_CONFIG+0x30);
+ outb(0x00, GAPSPCI_BBA_CONFIG+0x3c);
+ outb(0xf0, GAPSPCI_BBA_CONFIG+0x0d);
+ outw(0x0006, GAPSPCI_BBA_CONFIG+0x04);
+ outl(0x00002001, GAPSPCI_BBA_CONFIG+0x10);
+ outl(0x01000000, GAPSPCI_BBA_CONFIG+0x14);
+
+ return register_pci_controller(&dreamcast_pci_controller);
+}
+arch_initcall(gapspci_init);