1 files changed, 169 insertions, 0 deletions

diff --git a/arch/sh/drivers/pci/ops-dreamcast.c b/arch/sh/drivers/pci/ops-dreamcast.c
new file mode 100644
index 000000000000..69af80b93e3f
--- /dev/null
+++ b/arch/sh/drivers/pci/ops-dreamcast.c
@@ -0,0 +1,169 @@
+/*
+ * arch/sh/pci/ops-dreamcast.c
+ *
+ * PCI operations 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/config.h>
+#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 <asm/io.h>
+#include <asm/irq.h>
+#include <asm/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,
+};
+
+static struct pci_ops gapspci_pci_ops;
+
+struct pci_channel board_pci_channels[] = {
+        { &gapspci_pci_ops, &gapspci_io_resource,
+          &gapspci_mem_resource, 0, 1 },
+        { 0, }
+};
+
+/*
+ * The !gapspci_config_access case really shouldn't happen, ever, unless
+ * someone implicitly messes around with the last devfn value.. otherwise we
+ * only support a single device anyways, and if we didn't have a BBA, we
+ * wouldn't make it terribly far through the PCI setup anyways.
+ *
+ * Also, we could very easily support both Type 0 and Type 1 configurations
+ * here, but since it doesn't seem that there is any such implementation in
+ * existance, we don't bother.
+ *
+ * I suppose if someone actually gets around to ripping the chip out of
+ * the BBA and hanging some more devices off of it, then this might be
+ * something to take into consideration. However, due to the cost of the BBA,
+ * and the general lack of activity by DC hardware hackers, this doesn't seem
+ * likely to happen anytime soon.
+ */
+static int gapspci_config_access(unsigned char bus, unsigned int devfn)
+{
+        return (bus == 0) && (devfn == 0);
+}
+
+/*
+ * We can also actually read and write in b/w/l sizes! Thankfully this part
+ * was at least done right, and we don't have to do the stupid masking and
+ * shifting that we do on the 7751! Small wonders never cease to amaze.
+ */
+static int gapspci_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 *val)
+{
+        *val = 0xffffffff;
+
+        if (!gapspci_config_access(bus->number, devfn))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        switch (size) {
+                case 1: *val = inb(GAPSPCI_BBA_CONFIG+where); break;
+                case 2: *val = inw(GAPSPCI_BBA_CONFIG+where); break;
+                case 4: *val = inl(GAPSPCI_BBA_CONFIG+where); break;
+        }       
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static int gapspci_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
+{
+        if (!gapspci_config_access(bus->number, devfn))
+                return PCIBIOS_DEVICE_NOT_FOUND;
+
+        switch (size) {
+                case 1: outb(( u8)val, GAPSPCI_BBA_CONFIG+where); break;
+                case 2: outw((u16)val, GAPSPCI_BBA_CONFIG+where); break;
+                case 4: outl((u32)val, GAPSPCI_BBA_CONFIG+where); break;
+        }
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops gapspci_pci_ops = {
+        .read   = gapspci_read,
+        .write  = gapspci_write,
+};
+
+/*
+ * gapspci init
+ */
+
+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++)
+                ;
+
+        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;
+}
+
+/* Haven't done anything here as yet */
+char * __devinit pcibios_setup(char *str)
+{
+        return str;
+}