sh: pci: Tidy up the dreamcast PCI support.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 105 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 000000000000..0897be5053d4
--- /dev/null
+++ b/arch/sh/drivers/pci/pci-dreamcast.c
@@ -0,0 +1,105 @@
+/*
+ * 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.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#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_io_resource = {
+        .name   = "GAPSPCI IO",
+        .start  = GAPSPCI_BBA_CONFIG,
+        .end    = GAPSPCI_BBA_CONFIG + GAPSPCI_BBA_CONFIG_SIZE - 1,
+        .flags  = IORESOURCE_IO,
+};
+
+static struct resource gapspci_mem_resource = {
+        .name   = "GAPSPCI mem",
+        .start  = GAPSPCI_DMA_BASE,
+        .end    = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1,
+        .flags  = IORESOURCE_MEM,
+};
+
+/*
+ * gapspci init
+ */
+
+static int __init gapspci_init(struct pci_channel *chan)
+{
+        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 0;
+}
+
+struct pci_channel board_pci_channels[] = {
+        {
+                .init           = gapspci_init,
+                .pci_ops        = &gapspci_pci_ops,
+                .io_resource    = &gapspci_io_resource,
+                .mem_resource   = &gapspci_mem_resource,
+                .first_devfn    = 0,
+                .last_devfn     = 1,
+        }, {
+                .init           = NULL,
+        }
+};