MIPS: Add core files for MIPS SEAD-3 development platform.

More information about the SEAD-3 platform can be found at
<http://www.mips.com/products/development-kits/mips-sead-3/>
on MTI's site. Currently, the M14K family of cores is what
the SEAD-3 is utilised with.

Signed-off-by: Douglas Leung <douglas@mips.com>
Signed-off-by: Chris Dearman <chris@mips.com>
Signed-off-by: Steven J. Hill <sjhill@mips.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/arch/mips/mti-sead3/sead3-int.c b/arch/mips/mti-sead3/sead3-int.c
new file mode 100644
index 000000000000..e26e08274fc5
--- /dev/null
+++ b/arch/mips/mti-sead3/sead3-int.c
@@ -0,0 +1,158 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
+ */
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/gic.h>
+#include <asm/irq_cpu.h>
+#include <asm/setup.h>
+
+#include <asm/mips-boards/sead3int.h>
+
+#define SEAD_CONFIG_GIC_PRESENT_SHF	1
+#define SEAD_CONFIG_GIC_PRESENT_MSK	(1 << SEAD_CONFIG_GIC_PRESENT_SHF)
+#define SEAD_CONFIG_BASE		0x1b100110
+#define SEAD_CONFIG_SIZE		4
+
+int gic_present;
+static unsigned long sead3_config_reg;
+
+/*
+ * This table defines the setup for each external GIC interrupt. It is
+ * indexed by interrupt number.
+ */
+#define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK
+static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
+	{ 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+	{ GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED, GIC_UNUSED },
+};
+
+asmlinkage void plat_irq_dispatch(void)
+{
+	unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+	int irq;
+
+	irq = (fls(pending) - CAUSEB_IP - 1);
+	if (irq >= 0)
+		do_IRQ(MIPS_CPU_IRQ_BASE + irq);
+	else
+		spurious_interrupt();
+}
+
+void __init arch_init_irq(void)
+{
+	int i;
+
+	if (!cpu_has_veic) {
+		mips_cpu_irq_init();
+
+		if (cpu_has_vint) {
+			/* install generic handler */
+			for (i = 0; i < 8; i++)
+				set_vi_handler(i, plat_irq_dispatch);
+		}
+	}
+
+	sead3_config_reg = (unsigned long)ioremap_nocache(SEAD_CONFIG_BASE,
+		SEAD_CONFIG_SIZE);
+	gic_present = (REG32(sead3_config_reg) & SEAD_CONFIG_GIC_PRESENT_MSK) >>
+		SEAD_CONFIG_GIC_PRESENT_SHF;
+	pr_info("GIC: %spresent\n", (gic_present) ? "" : "not ");
+	pr_info("EIC: %s\n",
+		(current_cpu_data.options & MIPS_CPU_VEIC) ?  "on" : "off");
+
+	if (gic_present)
+		gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
+			ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
+}
+
+void gic_enable_interrupt(int irq_vec)
+{
+	unsigned int i, irq_source;
+
+	/* enable all the interrupts associated with this vector */
+	for (i = 0; i < gic_shared_intr_map[irq_vec].num_shared_intr; i++) {
+		irq_source = gic_shared_intr_map[irq_vec].intr_list[i];
+		GIC_SET_INTR_MASK(irq_source);
+	}
+	/* enable all local interrupts associated with this vector */
+	if (gic_shared_intr_map[irq_vec].local_intr_mask) {
+		GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0);
+		GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_SMASK),
+			gic_shared_intr_map[irq_vec].local_intr_mask);
+	}
+}
+
+void gic_disable_interrupt(int irq_vec)
+{
+	unsigned int i, irq_source;
+
+	/* disable all the interrupts associated with this vector */
+	for (i = 0; i < gic_shared_intr_map[irq_vec].num_shared_intr; i++) {
+		irq_source = gic_shared_intr_map[irq_vec].intr_list[i];
+		GIC_CLR_INTR_MASK(irq_source);
+	}
+	/* disable all local interrupts associated with this vector */
+	if (gic_shared_intr_map[irq_vec].local_intr_mask) {
+		GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), 0);
+		GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_RMASK),
+			gic_shared_intr_map[irq_vec].local_intr_mask);
+	}
+}
+
+void gic_irq_ack(struct irq_data *d)
+{
+	GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
+}
+
+void gic_finish_irq(struct irq_data *d)
+{
+	unsigned int irq = (d->irq - gic_irq_base);
+	unsigned int i, irq_source;
+
+	/* Clear edge detectors. */
+	for (i = 0; i < gic_shared_intr_map[irq].num_shared_intr; i++) {
+		irq_source = gic_shared_intr_map[irq].intr_list[i];
+		if (gic_irq_flags[irq_source] & GIC_TRIG_EDGE)
+			GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq_source);
+	}
+
+	/* Enable interrupts. */
+	GIC_SET_INTR_MASK(irq);
+}
+
+void __init gic_platform_init(int irqs, struct irq_chip *irq_controller)
+{
+	int i;
+
+	/*
+	 * For non-EIC mode, we want to setup the GIC in pass-through
+	 * mode, as if the GIC didn't exist. Do not map any interrupts
+	 * for an external interrupt controller.
+	 */
+	if (!cpu_has_veic)
+		return;
+
+	for (i = gic_irq_base; i < (gic_irq_base + irqs); i++)
+		irq_set_chip_and_handler(i, irq_controller, handle_percpu_irq);
+}