1 files changed, 161 insertions, 0 deletions
diff --git a/arch/sh/cchips/hd6446x/hd64461.c b/arch/sh/cchips/hd6446x/hd64461.c
new file mode 100644
index 00000000000..97f6512aa1b
--- /dev/null
+++ b/arch/sh/cchips/hd6446x/hd64461.c
@@ -0,0 +1,161 @@
+/*
+ *	Copyright (C) 2000 YAEGASHI Takeshi
+ *	Hitachi HD64461 companion chip support
+ */
+
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/hd64461.h>
+
+static void disable_hd64461_irq(unsigned int irq)
+{
+	unsigned short nimr;
+	unsigned short mask = 1 << (irq - HD64461_IRQBASE);
+
+	nimr = inw(HD64461_NIMR);
+	nimr |= mask;
+	outw(nimr, HD64461_NIMR);
+}
+
+static void enable_hd64461_irq(unsigned int irq)
+{
+	unsigned short nimr;
+	unsigned short mask = 1 << (irq - HD64461_IRQBASE);
+
+	nimr = inw(HD64461_NIMR);
+	nimr &= ~mask;
+	outw(nimr, HD64461_NIMR);
+}
+
+static void mask_and_ack_hd64461(unsigned int irq)
+{
+	disable_hd64461_irq(irq);
+#ifdef CONFIG_HD64461_ENABLER
+	if (irq == HD64461_IRQBASE + 13)
+		outb(0x00, HD64461_PCC1CSCR);
+#endif
+}
+
+static void end_hd64461_irq(unsigned int irq)
+{
+	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
+		enable_hd64461_irq(irq);
+}
+
+static unsigned int startup_hd64461_irq(unsigned int irq)
+{
+	enable_hd64461_irq(irq);
+	return 0;
+}
+
+static void shutdown_hd64461_irq(unsigned int irq)
+{
+	disable_hd64461_irq(irq);
+}
+
+static struct hw_interrupt_type hd64461_irq_type = {
+	.typename	= "HD64461-IRQ",
+	.startup	= startup_hd64461_irq,
+	.shutdown	= shutdown_hd64461_irq,
+	.enable		= enable_hd64461_irq,
+	.disable	= disable_hd64461_irq,
+	.ack		= mask_and_ack_hd64461,
+	.end		= end_hd64461_irq,
+};
+
+static irqreturn_t hd64461_interrupt(int irq, void *dev_id)
+{
+	printk(KERN_INFO
+	       "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n",
+	       inw(HD64461_NIRR), inw(HD64461_NIMR));
+
+	return IRQ_NONE;
+}
+
+static struct {
+	int (*func) (int, void *);
+	void *dev;
+} hd64461_demux[HD64461_IRQ_NUM];
+
+void hd64461_register_irq_demux(int irq,
+				int (*demux) (int irq, void *dev), void *dev)
+{
+	hd64461_demux[irq - HD64461_IRQBASE].func = demux;
+	hd64461_demux[irq - HD64461_IRQBASE].dev = dev;
+}
+
+EXPORT_SYMBOL(hd64461_register_irq_demux);
+
+void hd64461_unregister_irq_demux(int irq)
+{
+	hd64461_demux[irq - HD64461_IRQBASE].func = 0;
+}
+
+EXPORT_SYMBOL(hd64461_unregister_irq_demux);
+
+int hd64461_irq_demux(int irq)
+{
+	if (irq == CONFIG_HD64461_IRQ) {
+		unsigned short bit;
+		unsigned short nirr = inw(HD64461_NIRR);
+		unsigned short nimr = inw(HD64461_NIMR);
+		int i;
+
+		nirr &= ~nimr;
+		for (bit = 1, i = 0; i < 16; bit <<= 1, i++)
+			if (nirr & bit)
+				break;
+		if (i == 16)
+			irq = CONFIG_HD64461_IRQ;
+		else {
+			irq = HD64461_IRQBASE + i;
+			if (hd64461_demux[i].func != 0) {
+				irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev);
+			}
+		}
+	}
+	return __irq_demux(irq);
+}
+
+static struct irqaction irq0 = { hd64461_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64461", NULL, NULL };
+
+int __init setup_hd64461(void)
+{
+	int i;
+
+	if (!MACH_HD64461)
+		return 0;
+
+	printk(KERN_INFO
+	       "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n",
+	       CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE,
+	       HD64461_IRQBASE + 15);
+
+#if defined(CONFIG_CPU_SUBTYPE_SH7709)	/* Should be at processor specific part.. */
+	outw(0x2240, INTC_ICR1);
+#endif
+	outw(0xffff, HD64461_NIMR);
+
+	for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) {
+		irq_desc[i].chip = &hd64461_irq_type;
+	}
+
+	setup_irq(CONFIG_HD64461_IRQ, &irq0);
+
+#ifdef CONFIG_HD64461_ENABLER
+	printk(KERN_INFO "HD64461: enabling PCMCIA devices\n");
+	outb(0x4c, HD64461_PCC1CSCIER);
+	outb(0x00, HD64461_PCC1CSCR);
+#endif
+
+	return 0;
+}
+
+module_init(setup_hd64461);