Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 195 insertions, 0 deletions

diff --git a/arch/m68k/amiga/cia.c b/arch/m68k/amiga/cia.c
new file mode 100644
index 000000000..b9aee983e
--- /dev/null
+++ b/arch/m68k/amiga/cia.c
@@ -0,0 +1,195 @@
+/*
+ *  linux/arch/m68k/amiga/cia.c - CIA support
+ *
+ *  Copyright (C) 1996 Roman Zippel
+ *
+ *  The concept of some functions bases on the original Amiga OS function
+ *
+ * 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/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/kernel_stat.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/irq.h>
+#include <asm/amigahw.h>
+#include <asm/amigaints.h>
+
+struct ciabase {
+	volatile struct CIA *cia;
+	unsigned char icr_mask, icr_data;
+	unsigned short int_mask;
+	int handler_irq, cia_irq, server_irq;
+	char *name;
+} ciaa_base = {
+	.cia		= &ciaa,
+	.int_mask	= IF_PORTS,
+	.handler_irq	= IRQ_AMIGA_PORTS,
+	.cia_irq	= IRQ_AMIGA_CIAA,
+	.name		= "CIAA"
+}, ciab_base = {
+	.cia		= &ciab,
+	.int_mask	= IF_EXTER,
+	.handler_irq	= IRQ_AMIGA_EXTER,
+	.cia_irq	= IRQ_AMIGA_CIAB,
+	.name		= "CIAB"
+};
+
+/*
+ *  Cause or clear CIA interrupts, return old interrupt status.
+ */
+
+unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
+{
+	unsigned char old;
+
+	old = (base->icr_data |= base->cia->icr);
+	if (mask & CIA_ICR_SETCLR)
+		base->icr_data |= mask;
+	else
+		base->icr_data &= ~mask;
+	if (base->icr_data & base->icr_mask)
+		amiga_custom.intreq = IF_SETCLR | base->int_mask;
+	return old & base->icr_mask;
+}
+
+/*
+ *  Enable or disable CIA interrupts, return old interrupt mask,
+ */
+
+unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
+{
+	unsigned char old;
+
+	old = base->icr_mask;
+	base->icr_data |= base->cia->icr;
+	base->cia->icr = mask;
+	if (mask & CIA_ICR_SETCLR)
+		base->icr_mask |= mask;
+	else
+		base->icr_mask &= ~mask;
+	base->icr_mask &= CIA_ICR_ALL;
+	if (base->icr_data & base->icr_mask)
+		amiga_custom.intreq = IF_SETCLR | base->int_mask;
+	return old;
+}
+
+static irqreturn_t cia_handler(int irq, void *dev_id)
+{
+	struct ciabase *base = dev_id;
+	int mach_irq;
+	unsigned char ints;
+	unsigned long flags;
+
+	/* Interrupts get disabled while the timer irq flag is cleared and
+	 * the timer interrupt serviced.
+	 */
+	mach_irq = base->cia_irq;
+	local_irq_save(flags);
+	ints = cia_set_irq(base, CIA_ICR_ALL);
+	amiga_custom.intreq = base->int_mask;
+	if (ints & 1)
+		generic_handle_irq(mach_irq);
+	local_irq_restore(flags);
+	mach_irq++, ints >>= 1;
+	for (; ints; mach_irq++, ints >>= 1) {
+		if (ints & 1)
+			generic_handle_irq(mach_irq);
+	}
+	return IRQ_HANDLED;
+}
+
+static void cia_irq_enable(struct irq_data *data)
+{
+	unsigned int irq = data->irq;
+	unsigned char mask;
+
+	if (irq >= IRQ_AMIGA_CIAB) {
+		mask = 1 << (irq - IRQ_AMIGA_CIAB);
+		cia_set_irq(&ciab_base, mask);
+		cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask);
+	} else {
+		mask = 1 << (irq - IRQ_AMIGA_CIAA);
+		cia_set_irq(&ciaa_base, mask);
+		cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask);
+	}
+}
+
+static void cia_irq_disable(struct irq_data *data)
+{
+	unsigned int irq = data->irq;
+
+	if (irq >= IRQ_AMIGA_CIAB)
+		cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
+	else
+		cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
+}
+
+static struct irq_chip cia_irq_chip = {
+	.name		= "cia",
+	.irq_enable	= cia_irq_enable,
+	.irq_disable	= cia_irq_disable,
+};
+
+/*
+ * Override auto irq 2 & 6 and use them as general chain
+ * for external interrupts, we link the CIA interrupt sources
+ * into this chain.
+ */
+
+static void auto_irq_enable(struct irq_data *data)
+{
+	switch (data->irq) {
+	case IRQ_AUTO_2:
+		amiga_custom.intena = IF_SETCLR | IF_PORTS;
+		break;
+	case IRQ_AUTO_6:
+		amiga_custom.intena = IF_SETCLR | IF_EXTER;
+		break;
+	}
+}
+
+static void auto_irq_disable(struct irq_data *data)
+{
+	switch (data->irq) {
+	case IRQ_AUTO_2:
+		amiga_custom.intena = IF_PORTS;
+		break;
+	case IRQ_AUTO_6:
+		amiga_custom.intena = IF_EXTER;
+		break;
+	}
+}
+
+static struct irq_chip auto_irq_chip = {
+	.name		= "auto",
+	.irq_enable	= auto_irq_enable,
+	.irq_disable	= auto_irq_disable,
+};
+
+void __init cia_init_IRQ(struct ciabase *base)
+{
+	m68k_setup_irq_controller(&cia_irq_chip, handle_simple_irq,
+				  base->cia_irq, CIA_IRQS);
+
+	/* clear any pending interrupt and turn off all interrupts */
+	cia_set_irq(base, CIA_ICR_ALL);
+	cia_able_irq(base, CIA_ICR_ALL);
+
+	/* override auto int and install CIA handler */
+	m68k_setup_irq_controller(&auto_irq_chip, handle_simple_irq,
+				  base->handler_irq, 1);
+	m68k_irq_startup_irq(base->handler_irq);
+	if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED,
+			base->name, base))
+		pr_err("Couldn't register %s interrupt\n", base->name);
+}