[PATCH] sh: SuperHyway support for SH4-202

This adds support for the relatively quirky (ie, not in line with any known
documentation, and amazed it works at all) SuperHyway implementation on
SH4-202.  This depends on the earlier SuperHyway patch for multiple block
support and VCR refactoring.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 177 insertions, 0 deletions

diff --git a/arch/sh/drivers/superhyway/Makefile b/arch/sh/drivers/superhyway/Makefile
new file mode 100644
index 000000000000..5b8e0c7ca3a5
--- /dev/null
+++ b/arch/sh/drivers/superhyway/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the SuperHyway specific kernel interface routines under Linux.
+#
+
+obj-$(CONFIG_CPU_SUBTYPE_SH4_202)	+= ops-sh4-202.o
+
diff --git a/arch/sh/drivers/superhyway/ops-sh4-202.c b/arch/sh/drivers/superhyway/ops-sh4-202.c
new file mode 100644
index 000000000000..a55c98a9052b
--- /dev/null
+++ b/arch/sh/drivers/superhyway/ops-sh4-202.c
@@ -0,0 +1,171 @@
+/*
+ * arch/sh/drivers/superhyway/ops-sh4-202.c
+ *
+ * SuperHyway bus support for SH4-202
+ *
+ * Copyright (C) 2005  Paul Mundt
+ *
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/superhyway.h>
+#include <linux/string.h>
+#include <asm/addrspace.h>
+#include <asm/io.h>
+
+#define PHYS_EMI_CBLOCK		P4SEGADDR(0x1ec00000)
+#define PHYS_EMI_DBLOCK		P4SEGADDR(0x08000000)
+#define PHYS_FEMI_CBLOCK	P4SEGADDR(0x1f800000)
+#define PHYS_FEMI_DBLOCK	P4SEGADDR(0x00000000)
+
+#define PHYS_EPBR_BLOCK		P4SEGADDR(0x1de00000)
+#define PHYS_DMAC_BLOCK		P4SEGADDR(0x1fa00000)
+#define PHYS_PBR_BLOCK		P4SEGADDR(0x1fc00000)
+
+static struct resource emi_resources[] = {
+	[0] = {
+		.start	= PHYS_EMI_CBLOCK,
+		.end	= PHYS_EMI_CBLOCK + 0x00300000 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= PHYS_EMI_DBLOCK,
+		.end	= PHYS_EMI_DBLOCK + 0x08000000 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct superhyway_device emi_device = {
+	.name		= "emi",
+	.num_resources	= ARRAY_SIZE(emi_resources),
+	.resource	= emi_resources,
+};
+
+static struct resource femi_resources[] = {
+	[0] = {
+		.start	= PHYS_FEMI_CBLOCK,
+		.end	= PHYS_FEMI_CBLOCK + 0x00100000 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= PHYS_FEMI_DBLOCK,
+		.end	= PHYS_FEMI_DBLOCK + 0x08000000 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct superhyway_device femi_device = {
+	.name		= "femi",
+	.num_resources	= ARRAY_SIZE(femi_resources),
+	.resource	= femi_resources,
+};
+
+static struct resource epbr_resources[] = {
+	[0] = {
+		.start	= P4SEGADDR(0x1e7ffff8),
+		.end	= P4SEGADDR(0x1e7ffff8 + (sizeof(u32) * 2) - 1),
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= PHYS_EPBR_BLOCK,
+		.end	= PHYS_EPBR_BLOCK + 0x00a00000 - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct superhyway_device epbr_device = {
+	.name		= "epbr",
+	.num_resources	= ARRAY_SIZE(epbr_resources),
+	.resource	= epbr_resources,
+};
+
+static struct resource dmac_resource = {
+	.start	= PHYS_DMAC_BLOCK,
+	.end	= PHYS_DMAC_BLOCK + 0x00100000 - 1,
+	.flags	= IORESOURCE_MEM,
+};
+
+static struct superhyway_device dmac_device = {
+	.name		= "dmac",
+	.num_resources	= 1,
+	.resource	= &dmac_resource,
+};
+
+static struct resource pbr_resources[] = {
+	[0] = {
+		.start	= P4SEGADDR(0x1ffffff8),
+		.end	= P4SEGADDR(0x1ffffff8 + (sizeof(u32) * 2) - 1),
+		.flags	= IORESOURCE_MEM,
+	},
+	[1] = {
+		.start	= PHYS_PBR_BLOCK,
+		.end	= PHYS_PBR_BLOCK + 0x00400000 - (sizeof(u32) * 2) - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct superhyway_device pbr_device = {
+	.name		= "pbr",
+	.num_resources	= ARRAY_SIZE(pbr_resources),
+	.resource	= pbr_resources,
+};
+
+static struct superhyway_device *sh4202_devices[] __initdata = {
+	&emi_device, &femi_device, &epbr_device, &dmac_device, &pbr_device,
+};
+
+static int sh4202_read_vcr(unsigned long base, struct superhyway_vcr_info *vcr)
+{
+	u32 vcrh, vcrl;
+	u64 tmp;
+
+	/*
+	 * XXX: Even though the SH4-202 Evaluation Device documentation
+	 * indicates that VCRL is mapped first with VCRH at a + 0x04
+	 * offset, the opposite seems to be true.
+	 *
+	 * Some modules (PBR and ePBR for instance) also appear to have
+	 * VCRL/VCRH flipped in the documentation, but on the SH4-202
+	 * itself it appears that these are all consistently mapped with
+	 * VCRH preceeding VCRL.
+	 *
+	 * Do not trust the documentation, for it is evil.
+	 */
+	vcrh = ctrl_inl(base);
+	vcrl = ctrl_inl(base + sizeof(u32));
+
+	tmp = ((u64)vcrh << 32) | vcrl;
+	memcpy(vcr, &tmp, sizeof(u64));
+
+	return 0;
+}
+
+static int sh4202_write_vcr(unsigned long base, struct superhyway_vcr_info vcr)
+{
+	u64 tmp = *(u64 *)&vcr;
+
+	ctrl_outl((tmp >> 32) & 0xffffffff, base);
+	ctrl_outl(tmp & 0xffffffff, base + sizeof(u32));
+
+	return 0;
+}
+
+static struct superhyway_ops sh4202_superhyway_ops = {
+	.read_vcr	= sh4202_read_vcr,
+	.write_vcr	= sh4202_write_vcr,
+};
+
+struct superhyway_bus superhyway_channels[] = {
+	{ &sh4202_superhyway_ops, },
+	{ 0, },
+};
+
+int __init superhyway_scan_bus(struct superhyway_bus *bus)
+{
+	return superhyway_add_devices(bus, sh4202_devices,
+				      ARRAY_SIZE(sh4202_devices));
+}
+