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-rw-r--r--arch/sh/boards/superh/microdev/irq.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/arch/sh/boards/superh/microdev/irq.c b/arch/sh/boards/superh/microdev/irq.c
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index 000000000000..1298883eca4b
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1/*
2 * arch/sh/boards/superh/microdev/irq.c
3 *
4 * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
5 *
6 * SuperH SH4-202 MicroDev board support.
7 *
8 * May be copied or modified under the terms of the GNU General Public
9 * License. See linux/COPYING for more information.
10 */
11
12#include <linux/config.h>
13#include <linux/init.h>
14#include <linux/irq.h>
15
16#include <asm/system.h>
17#include <asm/io.h>
18#include <asm/mach/irq.h>
19
20#define NUM_EXTERNAL_IRQS 16 /* IRL0 .. IRL15 */
21
22
23static const struct {
24 unsigned char fpgaIrq;
25 unsigned char mapped;
26 const char *name;
27} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
28 { 0, 0, "unused" }, /* IRQ #0 IRL=15 0x200 */
29 { MICRODEV_FPGA_IRQ_KEYBOARD, 1, "keyboard" }, /* IRQ #1 IRL=14 0x220 */
30 { MICRODEV_FPGA_IRQ_SERIAL1, 1, "Serial #1"}, /* IRQ #2 IRL=13 0x240 */
31 { MICRODEV_FPGA_IRQ_ETHERNET, 1, "Ethernet" }, /* IRQ #3 IRL=12 0x260 */
32 { MICRODEV_FPGA_IRQ_SERIAL2, 0, "Serial #2"}, /* IRQ #4 IRL=11 0x280 */
33 { 0, 0, "unused" }, /* IRQ #5 IRL=10 0x2a0 */
34 { 0, 0, "unused" }, /* IRQ #6 IRL=9 0x2c0 */
35 { MICRODEV_FPGA_IRQ_USB_HC, 1, "USB" }, /* IRQ #7 IRL=8 0x2e0 */
36 { MICRODEV_IRQ_PCI_INTA, 1, "PCI INTA" }, /* IRQ #8 IRL=7 0x300 */
37 { MICRODEV_IRQ_PCI_INTB, 1, "PCI INTB" }, /* IRQ #9 IRL=6 0x320 */
38 { MICRODEV_IRQ_PCI_INTC, 1, "PCI INTC" }, /* IRQ #10 IRL=5 0x340 */
39 { MICRODEV_IRQ_PCI_INTD, 1, "PCI INTD" }, /* IRQ #11 IRL=4 0x360 */
40 { MICRODEV_FPGA_IRQ_MOUSE, 1, "mouse" }, /* IRQ #12 IRL=3 0x380 */
41 { MICRODEV_FPGA_IRQ_IDE2, 1, "IDE #2" }, /* IRQ #13 IRL=2 0x3a0 */
42 { MICRODEV_FPGA_IRQ_IDE1, 1, "IDE #1" }, /* IRQ #14 IRL=1 0x3c0 */
43 { 0, 0, "unused" }, /* IRQ #15 IRL=0 0x3e0 */
44};
45
46#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
47# error Inconsistancy in defining the IRQ# for Keyboard!
48#endif
49
50#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
51# error Inconsistancy in defining the IRQ# for Ethernet!
52#endif
53
54#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
55# error Inconsistancy in defining the IRQ# for USB!
56#endif
57
58#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
59# error Inconsistancy in defining the IRQ# for PS/2 Mouse!
60#endif
61
62#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
63# error Inconsistancy in defining the IRQ# for secondary IDE!
64#endif
65
66#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
67# error Inconsistancy in defining the IRQ# for primary IDE!
68#endif
69
70static void enable_microdev_irq(unsigned int irq);
71static void disable_microdev_irq(unsigned int irq);
72
73 /* shutdown is same as "disable" */
74#define shutdown_microdev_irq disable_microdev_irq
75
76static void mask_and_ack_microdev(unsigned int);
77static void end_microdev_irq(unsigned int irq);
78
79static unsigned int startup_microdev_irq(unsigned int irq)
80{
81 enable_microdev_irq(irq);
82 return 0; /* never anything pending */
83}
84
85static struct hw_interrupt_type microdev_irq_type = {
86 "MicroDev-IRQ",
87 startup_microdev_irq,
88 shutdown_microdev_irq,
89 enable_microdev_irq,
90 disable_microdev_irq,
91 mask_and_ack_microdev,
92 end_microdev_irq
93};
94
95static void disable_microdev_irq(unsigned int irq)
96{
97 unsigned int flags;
98 unsigned int fpgaIrq;
99
100 if (irq >= NUM_EXTERNAL_IRQS) return;
101 if (!fpgaIrqTable[irq].mapped) return;
102
103 fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
104
105 /* disable interrupts */
106 local_irq_save(flags);
107
108 /* disable interupts on the FPGA INTC register */
109 ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
110
111 /* restore interrupts */
112 local_irq_restore(flags);
113}
114
115static void enable_microdev_irq(unsigned int irq)
116{
117 unsigned long priorityReg, priorities, pri;
118 unsigned int flags;
119 unsigned int fpgaIrq;
120
121
122 if (irq >= NUM_EXTERNAL_IRQS) return;
123 if (!fpgaIrqTable[irq].mapped) return;
124
125 pri = 15 - irq;
126
127 fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
128 priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
129
130 /* disable interrupts */
131 local_irq_save(flags);
132
133 /* set priority for the interrupt */
134 priorities = ctrl_inl(priorityReg);
135 priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
136 priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
137 ctrl_outl(priorities, priorityReg);
138
139 /* enable interupts on the FPGA INTC register */
140 ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
141
142 /* restore interrupts */
143 local_irq_restore(flags);
144}
145
146 /* This functions sets the desired irq handler to be a MicroDev type */
147static void __init make_microdev_irq(unsigned int irq)
148{
149 disable_irq_nosync(irq);
150 irq_desc[irq].handler = &microdev_irq_type;
151 disable_microdev_irq(irq);
152}
153
154static void mask_and_ack_microdev(unsigned int irq)
155{
156 disable_microdev_irq(irq);
157}
158
159static void end_microdev_irq(unsigned int irq)
160{
161 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
162 {
163 enable_microdev_irq(irq);
164 }
165}
166
167extern void __init init_microdev_irq(void)
168{
169 int i;
170
171 /* disable interupts on the FPGA INTC register */
172 ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG);
173
174 for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
175 {
176 make_microdev_irq(i);
177 }
178}
179
180extern void microdev_print_fpga_intc_status(void)
181{
182 volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
183 volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
184 volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
185 volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
186 volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
187 volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
188 volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
189 volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
190
191 printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
192 printk("FPGA_INTENB = 0x%08x\n", *intenb);
193 printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
194 printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
195 printk("FPGA_INTREQ = 0x%08x\n", *intreq);
196 printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
197 printk("-------------------------------------------------------------------------------\n");
198}
199
200
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