5 files changed, 263 insertions, 0 deletions
diff --git a/arch/sh/boards/saturn/Makefile b/arch/sh/boards/saturn/Makefile
new file mode 100644
index 00000000000..75a3042e252
--- /dev/null
+++ b/arch/sh/boards/saturn/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for the Sega Saturn specific parts of the kernel
+#
+
+obj-y	 := setup.o io.o irq.o
+
+obj-$(CONFIG_SMP) += smp.o
+
diff --git a/arch/sh/boards/saturn/io.c b/arch/sh/boards/saturn/io.c
new file mode 100644
index 00000000000..c6e4f7f2e68
--- /dev/null
+++ b/arch/sh/boards/saturn/io.c
@@ -0,0 +1,26 @@
+/*
+ * arch/sh/boards/saturn/io.c
+ *
+ * I/O routines for the Sega Saturn.
+ *
+ * Copyright (C) 2002 Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <asm/saturn/io.h>
+#include <asm/machvec.h>
+
+unsigned long saturn_isa_port2addr(unsigned long offset)
+{
+	return offset;
+}
+
+void *saturn_ioremap(unsigned long offset, unsigned long size)
+{
+	return (void *)offset;
+}
+
+void saturn_iounmap(void *addr)
+{
+}
+
diff --git a/arch/sh/boards/saturn/irq.c b/arch/sh/boards/saturn/irq.c
new file mode 100644
index 00000000000..15d1d3f0f78
--- /dev/null
+++ b/arch/sh/boards/saturn/irq.c
@@ -0,0 +1,118 @@
+/*
+ * arch/sh/boards/saturn/irq.c
+ *
+ * Copyright (C) 2002 Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+/*
+ * Interrupts map out as follows:
+ *
+ *  Vector	Name		Mask
+ *
+ * 	64	VBLANKIN	0x0001
+ * 	65	VBLANKOUT	0x0002
+ *	66	HBLANKIN	0x0004
+ *	67	TIMER0		0x0008
+ *	68	TIMER1		0x0010
+ *	69	DSPEND		0x0020
+ *	70	SOUNDREQUEST	0x0040
+ *	71	SYSTEMMANAGER	0x0080
+ *	72	PAD		0x0100
+ *	73	LEVEL2DMAEND	0x0200
+ *	74	LEVEL1DMAEND	0x0400
+ *	75	LEVEL0DMAEND	0x0800
+ *	76	DMAILLEGAL	0x1000
+ *	77	SRITEDRAWEND	0x2000
+ *	78	ABUS		0x8000
+ *
+ */
+#define SATURN_IRQ_MIN		64	/* VBLANKIN */
+#define SATURN_IRQ_MAX		78	/* ABUS */
+
+#define SATURN_IRQ_MASK		0xbfff
+
+static inline u32 saturn_irq_mask(unsigned int irq_nr)
+{
+	u32 mask;
+
+	mask = (1 << (irq_nr - SATURN_IRQ_MIN));
+	mask <<= (irq_nr == SATURN_IRQ_MAX);
+	mask &= SATURN_IRQ_MASK;
+
+	return mask;
+}
+
+static inline void mask_saturn_irq(unsigned int irq_nr)
+{
+	u32 mask;
+
+	mask = ctrl_inl(SATURN_IMR);
+	mask |= saturn_irq_mask(irq_nr);
+	ctrl_outl(mask, SATURN_IMR);
+}
+
+static inline void unmask_saturn_irq(unsigned int irq_nr)
+{
+	u32 mask;
+
+	mask = ctrl_inl(SATURN_IMR);
+	mask &= ~saturn_irq_mask(irq_nr);
+	ctrl_outl(mask, SATURN_IMR);
+}
+
+static void disable_saturn_irq(unsigned int irq_nr)
+{
+	mask_saturn_irq(irq_nr);
+}
+
+static void enable_saturn_irq(unsigned int irq_nr)
+{
+	unmask_saturn_irq(irq_nr);
+}
+
+static void mask_and_ack_saturn_irq(unsigned int irq_nr)
+{
+	mask_saturn_irq(irq_nr);
+}
+
+static void end_saturn_irq(unsigned int irq_nr)
+{
+	if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
+		unmask_saturn_irq(irq_nr);
+}
+
+static unsigned int startup_saturn_irq(unsigned int irq_nr)
+{
+	unmask_saturn_irq(irq_nr);
+
+	return 0;
+}
+
+static void shutdown_saturn_irq(unsigned int irq_nr)
+{
+	mask_saturn_irq(irq_nr);
+}
+
+static struct hw_interrupt_type saturn_int = {
+	.typename	= "Saturn",
+	.enable		= enable_saturn_irq,
+	.disable	= disable_saturn_irq,
+	.ack		= mask_and_ack_saturn_irq,
+	.end		= end_saturn_irq,
+	.startup	= startup_saturn_irq,
+	.shutdown	= shutdown_saturn_irq,
+};
+
+int saturn_irq_demux(int irq_nr)
+{
+	/* FIXME */
+	return irq_nr;
+}
+
diff --git a/arch/sh/boards/saturn/setup.c b/arch/sh/boards/saturn/setup.c
new file mode 100644
index 00000000000..bea6c572ad8
--- /dev/null
+++ b/arch/sh/boards/saturn/setup.c
@@ -0,0 +1,43 @@
+/* 
+ * arch/sh/boards/saturn/setup.c
+ *
+ * Hardware support for the Sega Saturn.
+ *
+ * Copyright (c) 2002 Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/machvec.h>
+#include <asm/mach/io.h>
+
+extern int saturn_irq_demux(int irq_nr);
+
+const char *get_system_type(void)
+{
+	return "Sega Saturn";
+}
+
+/*
+ * The Machine Vector
+ */
+struct sh_machine_vector mv_saturn __initmv = {
+	.mv_nr_irqs		= 80,	/* Fix this later */
+
+	.mv_isa_port2addr	= saturn_isa_port2addr,
+	.mv_irq_demux		= saturn_irq_demux,
+
+	.mv_ioremap		= saturn_ioremap,
+	.mv_iounmap		= saturn_iounmap,
+};
+
+ALIAS_MV(saturn)
+
+int __init platform_setup(void)
+{
+	return 0;
+}
+
diff --git a/arch/sh/boards/saturn/smp.c b/arch/sh/boards/saturn/smp.c
new file mode 100644
index 00000000000..76460918c9c
--- /dev/null
+++ b/arch/sh/boards/saturn/smp.c
@@ -0,0 +1,68 @@
+/* 
+ * arch/sh/boards/saturn/smp.c
+ *
+ * SMP support for the Sega Saturn.
+ *
+ * Copyright (c) 2002 Paul Mundt
+ *
+ * Released under the terms of the GNU GPL v2.0.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+
+#include <asm/saturn/smpc.h>
+
+extern void start_secondary(void);
+
+void __smp_send_ipi(unsigned int cpu, unsigned int action)
+{
+	/* Nothing here yet .. */
+}
+
+unsigned int __smp_probe_cpus(void)
+{
+	/*
+	 * This is just a straightforward master/slave configuration,
+	 * and probing isn't really supported..
+	 */
+	return 2;
+}
+
+/*
+ * We're only allowed to do byte-access to SMPC registers. In
+ * addition to which, we treat them as write-only, since
+ * reading from them will return undefined data.
+ */
+static inline void smpc_slave_stop(unsigned int cpu)
+{
+	smpc_barrier();
+	ctrl_outb(1, SMPC_STATUS);
+
+	ctrl_outb(SMPC_CMD_SSHOFF, SMPC_COMMAND);
+	smpc_barrier();
+}
+
+static inline void smpc_slave_start(unsigned int cpu)
+{
+	ctrl_outb(1, SMPC_STATUS);
+	ctrl_outb(SMPC_CMD_SSHON, SMPC_COMMAND);
+
+	smpc_barrier();
+}
+
+void __smp_slave_init(unsigned int cpu)
+{
+	register unsigned long vbr;
+	void **entry;
+
+	__asm__ __volatile__ ("stc vbr, %0\n\t" : "=r" (vbr));
+	entry = (void **)(vbr + 0x310 + 0x94);
+
+	smpc_slave_stop(cpu);
+
+	*(void **)entry = (void *)start_secondary;
+
+	smpc_slave_start(cpu);
+}
+