aboutsummaryrefslogtreecommitdiffstats
path: root/arch
diff options
context:
space:
mode:
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-omap1/Makefile2
-rw-r--r--arch/arm/mach-omap1/ams-delta-fiq.c155
-rw-r--r--arch/arm/mach-omap1/include/mach/ams-delta-fiq.h7
3 files changed, 163 insertions, 1 deletions
diff --git a/arch/arm/mach-omap1/Makefile b/arch/arm/mach-omap1/Makefile
index db0d48001344..ea231c7a550a 100644
--- a/arch/arm/mach-omap1/Makefile
+++ b/arch/arm/mach-omap1/Makefile
@@ -37,7 +37,7 @@ obj-$(CONFIG_MACH_OMAP_PALMZ71) += board-palmz71.o
37obj-$(CONFIG_MACH_OMAP_PALMTT) += board-palmtt.o 37obj-$(CONFIG_MACH_OMAP_PALMTT) += board-palmtt.o
38obj-$(CONFIG_MACH_NOKIA770) += board-nokia770.o 38obj-$(CONFIG_MACH_NOKIA770) += board-nokia770.o
39obj-$(CONFIG_MACH_AMS_DELTA) += board-ams-delta.o 39obj-$(CONFIG_MACH_AMS_DELTA) += board-ams-delta.o
40obj-$(CONFIG_AMS_DELTA_FIQ) += ams-delta-fiq-handler.o 40obj-$(CONFIG_AMS_DELTA_FIQ) += ams-delta-fiq.o ams-delta-fiq-handler.o
41obj-$(CONFIG_MACH_SX1) += board-sx1.o board-sx1-mmc.o 41obj-$(CONFIG_MACH_SX1) += board-sx1.o board-sx1-mmc.o
42obj-$(CONFIG_MACH_HERALD) += board-htcherald.o 42obj-$(CONFIG_MACH_HERALD) += board-htcherald.o
43 43
diff --git a/arch/arm/mach-omap1/ams-delta-fiq.c b/arch/arm/mach-omap1/ams-delta-fiq.c
new file mode 100644
index 000000000000..6c994e2d8879
--- /dev/null
+++ b/arch/arm/mach-omap1/ams-delta-fiq.c
@@ -0,0 +1,155 @@
1/*
2 * Amstrad E3 FIQ handling
3 *
4 * Copyright (C) 2009 Janusz Krzysztofik
5 * Copyright (c) 2006 Matt Callow
6 * Copyright (c) 2004 Amstrad Plc
7 * Copyright (C) 2001 RidgeRun, Inc.
8 *
9 * Parts of this code are taken from linux/arch/arm/mach-omap/irq.c
10 * in the MontaVista 2.4 kernel (and the Amstrad changes therein)
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License version 2 as published by
14 * the Free Software Foundation.
15 */
16#include <linux/gpio.h>
17#include <linux/interrupt.h>
18#include <linux/irq.h>
19#include <linux/module.h>
20#include <linux/io.h>
21
22#include <plat/board-ams-delta.h>
23
24#include <asm/fiq.h>
25#include <mach/ams-delta-fiq.h>
26
27static struct fiq_handler fh = {
28 .name = "ams-delta-fiq"
29};
30
31/*
32 * This buffer is shared between FIQ and IRQ contexts.
33 * The FIQ and IRQ isrs can both read and write it.
34 * It is structured as a header section several 32bit slots,
35 * followed by the circular buffer where the FIQ isr stores
36 * keystrokes received from the qwerty keyboard.
37 * See ams-delta-fiq.h for details of offsets.
38 */
39unsigned int fiq_buffer[1024];
40EXPORT_SYMBOL(fiq_buffer);
41
42static unsigned int irq_counter[16];
43
44static irqreturn_t deferred_fiq(int irq, void *dev_id)
45{
46 struct irq_desc *irq_desc;
47 struct irq_chip *irq_chip = NULL;
48 int gpio, irq_num, fiq_count;
49
50 irq_desc = irq_to_desc(IH_GPIO_BASE);
51 if (irq_desc)
52 irq_chip = irq_desc->chip;
53
54 /*
55 * For each handled GPIO interrupt, keep calling its interrupt handler
56 * until the IRQ counter catches the FIQ incremented interrupt counter.
57 */
58 for (gpio = AMS_DELTA_GPIO_PIN_KEYBRD_CLK;
59 gpio <= AMS_DELTA_GPIO_PIN_HOOK_SWITCH; gpio++) {
60 irq_num = gpio_to_irq(gpio);
61 fiq_count = fiq_buffer[FIQ_CNT_INT_00 + gpio];
62
63 while (irq_counter[gpio] < fiq_count) {
64 if (gpio != AMS_DELTA_GPIO_PIN_KEYBRD_CLK) {
65 /*
66 * It looks like handle_edge_irq() that
67 * OMAP GPIO edge interrupts default to,
68 * expects interrupt already unmasked.
69 */
70 if (irq_chip && irq_chip->unmask)
71 irq_chip->unmask(irq_num);
72 }
73 generic_handle_irq(irq_num);
74
75 irq_counter[gpio]++;
76 }
77 }
78 return IRQ_HANDLED;
79}
80
81void __init ams_delta_init_fiq(void)
82{
83 void *fiqhandler_start;
84 unsigned int fiqhandler_length;
85 struct pt_regs FIQ_regs;
86 unsigned long val, offset;
87 int i, retval;
88
89 fiqhandler_start = &qwerty_fiqin_start;
90 fiqhandler_length = &qwerty_fiqin_end - &qwerty_fiqin_start;
91 pr_info("Installing fiq handler from %p, length 0x%x\n",
92 fiqhandler_start, fiqhandler_length);
93
94 retval = claim_fiq(&fh);
95 if (retval) {
96 pr_err("ams_delta_init_fiq(): couldn't claim FIQ, ret=%d\n",
97 retval);
98 return;
99 }
100
101 retval = request_irq(INT_DEFERRED_FIQ, deferred_fiq,
102 IRQ_TYPE_EDGE_RISING, "deferred_fiq", 0);
103 if (retval < 0) {
104 pr_err("Failed to get deferred_fiq IRQ, ret=%d\n", retval);
105 release_fiq(&fh);
106 return;
107 }
108 /*
109 * Since no set_type() method is provided by OMAP irq chip,
110 * switch to edge triggered interrupt type manually.
111 */
112 offset = IRQ_ILR0_REG_OFFSET + INT_DEFERRED_FIQ * 0x4;
113 val = omap_readl(DEFERRED_FIQ_IH_BASE + offset) & ~(1 << 1);
114 omap_writel(val, DEFERRED_FIQ_IH_BASE + offset);
115
116 set_fiq_handler(fiqhandler_start, fiqhandler_length);
117
118 /*
119 * Initialise the buffer which is shared
120 * between FIQ mode and IRQ mode
121 */
122 fiq_buffer[FIQ_GPIO_INT_MASK] = 0;
123 fiq_buffer[FIQ_MASK] = 0;
124 fiq_buffer[FIQ_STATE] = 0;
125 fiq_buffer[FIQ_KEY] = 0;
126 fiq_buffer[FIQ_KEYS_CNT] = 0;
127 fiq_buffer[FIQ_KEYS_HICNT] = 0;
128 fiq_buffer[FIQ_TAIL_OFFSET] = 0;
129 fiq_buffer[FIQ_HEAD_OFFSET] = 0;
130 fiq_buffer[FIQ_BUF_LEN] = 256;
131 fiq_buffer[FIQ_MISSED_KEYS] = 0;
132 fiq_buffer[FIQ_BUFFER_START] =
133 (unsigned int) &fiq_buffer[FIQ_CIRC_BUFF];
134
135 for (i = FIQ_CNT_INT_00; i <= FIQ_CNT_INT_15; i++)
136 fiq_buffer[i] = 0;
137
138 /*
139 * FIQ mode r9 always points to the fiq_buffer, becauses the FIQ isr
140 * will run in an unpredictable context. The fiq_buffer is the FIQ isr's
141 * only means of communication with the IRQ level and other kernel
142 * context code.
143 */
144 FIQ_regs.ARM_r9 = (unsigned int)fiq_buffer;
145 set_fiq_regs(&FIQ_regs);
146
147 pr_info("request_fiq(): fiq_buffer = %p\n", fiq_buffer);
148
149 /*
150 * Redirect GPIO interrupts to FIQ
151 */
152 offset = IRQ_ILR0_REG_OFFSET + INT_GPIO_BANK1 * 0x4;
153 val = omap_readl(OMAP_IH1_BASE + offset) | 1;
154 omap_writel(val, OMAP_IH1_BASE + offset);
155}
diff --git a/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h b/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h
index 8dbe75b7b89f..7a2df29400ca 100644
--- a/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h
+++ b/arch/arm/mach-omap1/include/mach/ams-delta-fiq.h
@@ -69,4 +69,11 @@
69 69
70#define FIQ_CIRC_BUFF 30 /*Start of circular buffer */ 70#define FIQ_CIRC_BUFF 30 /*Start of circular buffer */
71 71
72#ifndef __ASSEMBLER__
73extern unsigned int fiq_buffer[];
74extern unsigned char qwerty_fiqin_start, qwerty_fiqin_end;
75
76extern void __init ams_delta_init_fiq(void);
77#endif
78
72#endif 79#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-01 14:25:56 -0400