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Diffstat (limited to 'arch/arm/mach-s3c24xx/bast-irq.c')
-rw-r--r--arch/arm/mach-s3c24xx/bast-irq.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/bast-irq.c b/arch/arm/mach-s3c24xx/bast-irq.c
new file mode 100644
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--- /dev/null
+++ b/arch/arm/mach-s3c24xx/bast-irq.c
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+/* linux/arch/arm/mach-s3c2410/bast-irq.c
+ *
+ * Copyright 2003-2005 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * http://www.simtec.co.uk/products/EB2410ITX/
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/io.h>
+
+#include <asm/mach-types.h>
+
+#include <mach/hardware.h>
+#include <asm/irq.h>
+
+#include <asm/mach/irq.h>
+
+#include <mach/regs-irq.h>
+#include <mach/bast-map.h>
+#include <mach/bast-irq.h>
+
+#include <plat/irq.h>
+
+#if 0
+#include <asm/debug-ll.h>
+#endif
+
+#define irqdbf(x...)
+#define irqdbf2(x...)
+
+
+/* handle PC104 ISA interrupts from the system CPLD */
+
+/* table of ISA irq nos to the relevant mask... zero means
+ * the irq is not implemented
+*/
+static unsigned char bast_pc104_irqmasks[] = {
+ 0, /* 0 */
+ 0, /* 1 */
+ 0, /* 2 */
+ 1, /* 3 */
+ 0, /* 4 */
+ 2, /* 5 */
+ 0, /* 6 */
+ 4, /* 7 */
+ 0, /* 8 */
+ 0, /* 9 */
+ 8, /* 10 */
+ 0, /* 11 */
+ 0, /* 12 */
+ 0, /* 13 */
+ 0, /* 14 */
+ 0, /* 15 */
+};
+
+static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
+
+static void
+bast_pc104_mask(struct irq_data *data)
+{
+ unsigned long temp;
+
+ temp = __raw_readb(BAST_VA_PC104_IRQMASK);
+ temp &= ~bast_pc104_irqmasks[data->irq];
+ __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
+}
+
+static void
+bast_pc104_maskack(struct irq_data *data)
+{
+ struct irq_desc *desc = irq_desc + IRQ_ISA;
+
+ bast_pc104_mask(data);
+ desc->irq_data.chip->irq_ack(&desc->irq_data);
+}
+
+static void
+bast_pc104_unmask(struct irq_data *data)
+{
+ unsigned long temp;
+
+ temp = __raw_readb(BAST_VA_PC104_IRQMASK);
+ temp |= bast_pc104_irqmasks[data->irq];
+ __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
+}
+
+static struct irq_chip bast_pc104_chip = {
+ .irq_mask = bast_pc104_mask,
+ .irq_unmask = bast_pc104_unmask,
+ .irq_ack = bast_pc104_maskack
+};
+
+static void
+bast_irq_pc104_demux(unsigned int irq,
+ struct irq_desc *desc)
+{
+ unsigned int stat;
+ unsigned int irqno;
+ int i;
+
+ stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
+
+ if (unlikely(stat == 0)) {
+ /* ack if we get an irq with nothing (ie, startup) */
+
+ desc = irq_desc + IRQ_ISA;
+ desc->irq_data.chip->irq_ack(&desc->irq_data);
+ } else {
+ /* handle the IRQ */
+
+ for (i = 0; stat != 0; i++, stat >>= 1) {
+ if (stat & 1) {
+ irqno = bast_pc104_irqs[i];
+ generic_handle_irq(irqno);
+ }
+ }
+ }
+}
+
+static __init int bast_irq_init(void)
+{
+ unsigned int i;
+
+ if (machine_is_bast()) {
+ printk(KERN_INFO "BAST PC104 IRQ routing, Copyright 2005 Simtec Electronics\n");
+
+ /* zap all the IRQs */
+
+ __raw_writeb(0x0, BAST_VA_PC104_IRQMASK);
+
+ irq_set_chained_handler(IRQ_ISA, bast_irq_pc104_demux);
+
+ /* register our IRQs */
+
+ for (i = 0; i < 4; i++) {
+ unsigned int irqno = bast_pc104_irqs[i];
+
+ irq_set_chip_and_handler(irqno, &bast_pc104_chip,
+ handle_level_irq);
+ set_irq_flags(irqno, IRQF_VALID);
+ }
+ }
+
+ return 0;
+}
+
+arch_initcall(bast_irq_init);