OMAP1: Amstrad Delta: add FIQ handler for serial keyboardport interrupt processing

This patch introduces a Fast Interrupt Request (FIQ) handler for Amstrad Delta
(E3) videophone. The handler's purpose is to process interrupts generated by a
GPIO line that a serial keyboard clock hangs off. It collects consecutive bits
into words, pushing them into a buffer, then requests a higher level interrupt
after one or more words are ready for further processing by a keyboard port
driver.

The handler also processes interrupts generated by two other GPIO lines, used
by other on-board supported devices, by simply requesting a higher level
interrupt, that in turn should invoke those device's specific irq handlers.

IRQ12 line, not used by OMAP1510 hardware (described as reserved), has been
choosen as a higher level interrupt source.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h b/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h
new file mode 100644
index 000000000000..8dbe75b7b89f
--- /dev/null
+++ b/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h
@@ -0,0 +1,72 @@
+/*
+ * arch/arm/mach-omap1/include/ams-delta-fiq.h
+ *
+ * Taken from the original Amstrad modifications to fiq.h
+ *
+ * Copyright (c) 2004 Amstrad Plc
+ * Copyright (c) 2006 Matt Callow
+ * Copyright (c) 2010 Janusz Krzysztofik
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __AMS_DELTA_FIQ_H
+#define __AMS_DELTA_FIQ_H
+
+#include <plat/irqs.h>
+
+/*
+ * Interrupt number used for passing control from FIQ to IRQ.
+ * IRQ12, described as reserved, has been selected.
+ */
+#define INT_DEFERRED_FIQ        INT_1510_RES12
+/*
+ * Base address of an interrupt handler that the INT_DEFERRED_FIQ belongs to.
+ */
+#if (INT_DEFERRED_FIQ < IH2_BASE)
+#define DEFERRED_FIQ_IH_BASE    OMAP_IH1_BASE
+#else
+#define DEFERRED_FIQ_IH_BASE    OMAP_IH2_BASE
+#endif
+
+/*
+ * These are the offsets from the begining of the fiq_buffer. They are put here
+ * since the buffer and header need to be accessed by drivers servicing devices
+ * which generate GPIO interrupts - e.g. keyboard, modem, hook switch.
+ */
+#define FIQ_MASK                 0
+#define FIQ_STATE                1
+#define FIQ_KEYS_CNT             2
+#define FIQ_TAIL_OFFSET          3
+#define FIQ_HEAD_OFFSET          4
+#define FIQ_BUF_LEN              5
+#define FIQ_KEY                  6
+#define FIQ_MISSED_KEYS          7
+#define FIQ_BUFFER_START         8
+#define FIQ_GPIO_INT_MASK        9
+#define FIQ_KEYS_HICNT          10
+#define FIQ_IRQ_PEND            11
+#define FIQ_SIR_CODE_L1         12
+#define IRQ_SIR_CODE_L2         13
+
+#define FIQ_CNT_INT_00          14
+#define FIQ_CNT_INT_KEY         15
+#define FIQ_CNT_INT_MDM         16
+#define FIQ_CNT_INT_03          17
+#define FIQ_CNT_INT_HSW         18
+#define FIQ_CNT_INT_05          19
+#define FIQ_CNT_INT_06          20
+#define FIQ_CNT_INT_07          21
+#define FIQ_CNT_INT_08          22
+#define FIQ_CNT_INT_09          23
+#define FIQ_CNT_INT_10          24
+#define FIQ_CNT_INT_11          25
+#define FIQ_CNT_INT_12          26
+#define FIQ_CNT_INT_13          27
+#define FIQ_CNT_INT_14          28
+#define FIQ_CNT_INT_15          29
+
+#define FIQ_CIRC_BUFF           30      /*Start of circular buffer */
+
+#endif