From fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <tpearson@raptorengineering.com>
Date: Wed, 23 Aug 2017 14:45:25 -0500
Subject: Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
---
 arch/mips/kernel/irq-msc01.c | 162 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 arch/mips/kernel/irq-msc01.c

(limited to 'arch/mips/kernel/irq-msc01.c')

diff --git a/arch/mips/kernel/irq-msc01.c b/arch/mips/kernel/irq-msc01.c
new file mode 100644
index 0000000..963c16d
--- /dev/null
+++ b/arch/mips/kernel/irq-msc01.c
@@ -0,0 +1,162 @@
+/*
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ * Copyright (c) 2004 MIPS Inc
+ * Author: chris@mips.com
+ *
+ * Copyright (C) 2004, 06 Ralf Baechle <ralf@linux-mips.org>
+ */
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/msc01_ic.h>
+#include <asm/traps.h>
+
+static unsigned long _icctrl_msc;
+#define MSC01_IC_REG_BASE	_icctrl_msc
+
+#define MSCIC_WRITE(reg, data)	do { *(volatile u32 *)(reg) = data; } while (0)
+#define MSCIC_READ(reg, data)	do { data = *(volatile u32 *)(reg); } while (0)
+
+static unsigned int irq_base;
+
+/* mask off an interrupt */
+static inline void mask_msc_irq(unsigned int irq)
+{
+	if (irq < (irq_base + 32))
+		MSCIC_WRITE(MSC01_IC_DISL, 1<<(irq - irq_base));
+	else
+		MSCIC_WRITE(MSC01_IC_DISH, 1<<(irq - irq_base - 32));
+}
+
+/* unmask an interrupt */
+static inline void unmask_msc_irq(unsigned int irq)
+{
+	if (irq < (irq_base + 32))
+		MSCIC_WRITE(MSC01_IC_ENAL, 1<<(irq - irq_base));
+	else
+		MSCIC_WRITE(MSC01_IC_ENAH, 1<<(irq - irq_base - 32));
+}
+
+/*
+ * Masks and ACKs an IRQ
+ */
+static void level_mask_and_ack_msc_irq(unsigned int irq)
+{
+	mask_msc_irq(irq);
+	if (!cpu_has_veic)
+		MSCIC_WRITE(MSC01_IC_EOI, 0);
+	/* This actually needs to be a call into platform code */
+	smtc_im_ack_irq(irq);
+}
+
+/*
+ * Masks and ACKs an IRQ
+ */
+static void edge_mask_and_ack_msc_irq(unsigned int irq)
+{
+	mask_msc_irq(irq);
+	if (!cpu_has_veic)
+		MSCIC_WRITE(MSC01_IC_EOI, 0);
+	else {
+		u32 r;
+		MSCIC_READ(MSC01_IC_SUP+irq*8, r);
+		MSCIC_WRITE(MSC01_IC_SUP+irq*8, r | ~MSC01_IC_SUP_EDGE_BIT);
+		MSCIC_WRITE(MSC01_IC_SUP+irq*8, r);
+	}
+	smtc_im_ack_irq(irq);
+}
+
+/*
+ * End IRQ processing
+ */
+static void end_msc_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		unmask_msc_irq(irq);
+}
+
+/*
+ * Interrupt handler for interrupts coming from SOC-it.
+ */
+void ll_msc_irq(void)
+{
+ 	unsigned int irq;
+
+	/* read the interrupt vector register */
+	MSCIC_READ(MSC01_IC_VEC, irq);
+	if (irq < 64)
+		do_IRQ(irq + irq_base);
+	else {
+		/* Ignore spurious interrupt */
+	}
+}
+
+static void msc_bind_eic_interrupt(int irq, int set)
+{
+	MSCIC_WRITE(MSC01_IC_RAMW,
+		    (irq<<MSC01_IC_RAMW_ADDR_SHF) | (set<<MSC01_IC_RAMW_DATA_SHF));
+}
+
+static struct irq_chip msc_levelirq_type = {
+	.name = "SOC-it-Level",
+	.ack = level_mask_and_ack_msc_irq,
+	.mask = mask_msc_irq,
+	.mask_ack = level_mask_and_ack_msc_irq,
+	.unmask = unmask_msc_irq,
+	.eoi = unmask_msc_irq,
+	.end = end_msc_irq,
+};
+
+static struct irq_chip msc_edgeirq_type = {
+	.name = "SOC-it-Edge",
+	.ack = edge_mask_and_ack_msc_irq,
+	.mask = mask_msc_irq,
+	.mask_ack = edge_mask_and_ack_msc_irq,
+	.unmask = unmask_msc_irq,
+	.eoi = unmask_msc_irq,
+	.end = end_msc_irq,
+};
+
+
+void __init init_msc_irqs(unsigned long icubase, unsigned int irqbase, msc_irqmap_t *imp, int nirq)
+{
+	_icctrl_msc = (unsigned long) ioremap(icubase, 0x40000);
+
+	/* Reset interrupt controller - initialises all registers to 0 */
+	MSCIC_WRITE(MSC01_IC_RST, MSC01_IC_RST_RST_BIT);
+
+	board_bind_eic_interrupt = &msc_bind_eic_interrupt;
+
+	for (; nirq >= 0; nirq--, imp++) {
+		int n = imp->im_irq;
+
+		switch (imp->im_type) {
+		case MSC01_IRQ_EDGE:
+			set_irq_chip(irqbase+n, &msc_edgeirq_type);
+			if (cpu_has_veic)
+				MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT);
+			else
+				MSCIC_WRITE(MSC01_IC_SUP+n*8, MSC01_IC_SUP_EDGE_BIT | imp->im_lvl);
+			break;
+		case MSC01_IRQ_LEVEL:
+			set_irq_chip(irqbase+n, &msc_levelirq_type);
+			if (cpu_has_veic)
+				MSCIC_WRITE(MSC01_IC_SUP+n*8, 0);
+			else
+				MSCIC_WRITE(MSC01_IC_SUP+n*8, imp->im_lvl);
+		}
+	}
+
+	irq_base = irqbase;
+
+	MSCIC_WRITE(MSC01_IC_GENA, MSC01_IC_GENA_GENA_BIT);	/* Enable interrupt generation */
+
+}
-- 
cgit v1.1