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-rw-r--r--arch/sh/boards/mach-microdev/irq.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/arch/sh/boards/mach-microdev/irq.c b/arch/sh/boards/mach-microdev/irq.c
new file mode 100644
index 000000000000..4d335077a3ff
--- /dev/null
+++ b/arch/sh/boards/mach-microdev/irq.c
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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/init.h>
13#include <linux/irq.h>
14#include <linux/interrupt.h>
15#include <asm/system.h>
16#include <asm/io.h>
17#include <asm/microdev.h>
18
19#define NUM_EXTERNAL_IRQS 16 /* IRL0 .. IRL15 */
20
21static const struct {
22 unsigned char fpgaIrq;
23 unsigned char mapped;
24 const char *name;
25} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
26 { 0, 0, "unused" }, /* IRQ #0 IRL=15 0x200 */
27 { MICRODEV_FPGA_IRQ_KEYBOARD, 1, "keyboard" }, /* IRQ #1 IRL=14 0x220 */
28 { MICRODEV_FPGA_IRQ_SERIAL1, 1, "Serial #1"}, /* IRQ #2 IRL=13 0x240 */
29 { MICRODEV_FPGA_IRQ_ETHERNET, 1, "Ethernet" }, /* IRQ #3 IRL=12 0x260 */
30 { MICRODEV_FPGA_IRQ_SERIAL2, 0, "Serial #2"}, /* IRQ #4 IRL=11 0x280 */
31 { 0, 0, "unused" }, /* IRQ #5 IRL=10 0x2a0 */
32 { 0, 0, "unused" }, /* IRQ #6 IRL=9 0x2c0 */
33 { MICRODEV_FPGA_IRQ_USB_HC, 1, "USB" }, /* IRQ #7 IRL=8 0x2e0 */
34 { MICRODEV_IRQ_PCI_INTA, 1, "PCI INTA" }, /* IRQ #8 IRL=7 0x300 */
35 { MICRODEV_IRQ_PCI_INTB, 1, "PCI INTB" }, /* IRQ #9 IRL=6 0x320 */
36 { MICRODEV_IRQ_PCI_INTC, 1, "PCI INTC" }, /* IRQ #10 IRL=5 0x340 */
37 { MICRODEV_IRQ_PCI_INTD, 1, "PCI INTD" }, /* IRQ #11 IRL=4 0x360 */
38 { MICRODEV_FPGA_IRQ_MOUSE, 1, "mouse" }, /* IRQ #12 IRL=3 0x380 */
39 { MICRODEV_FPGA_IRQ_IDE2, 1, "IDE #2" }, /* IRQ #13 IRL=2 0x3a0 */
40 { MICRODEV_FPGA_IRQ_IDE1, 1, "IDE #1" }, /* IRQ #14 IRL=1 0x3c0 */
41 { 0, 0, "unused" }, /* IRQ #15 IRL=0 0x3e0 */
42};
43
44#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
45# error Inconsistancy in defining the IRQ# for Keyboard!
46#endif
47
48#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
49# error Inconsistancy in defining the IRQ# for Ethernet!
50#endif
51
52#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
53# error Inconsistancy in defining the IRQ# for USB!
54#endif
55
56#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
57# error Inconsistancy in defining the IRQ# for PS/2 Mouse!
58#endif
59
60#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
61# error Inconsistancy in defining the IRQ# for secondary IDE!
62#endif
63
64#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
65# error Inconsistancy in defining the IRQ# for primary IDE!
66#endif
67
68static void enable_microdev_irq(unsigned int irq);
69static void disable_microdev_irq(unsigned int irq);
70
71 /* shutdown is same as "disable" */
72#define shutdown_microdev_irq disable_microdev_irq
73
74static void mask_and_ack_microdev(unsigned int);
75static void end_microdev_irq(unsigned int irq);
76
77static unsigned int startup_microdev_irq(unsigned int irq)
78{
79 enable_microdev_irq(irq);
80 return 0; /* never anything pending */
81}
82
83static struct hw_interrupt_type microdev_irq_type = {
84 .typename = "MicroDev-IRQ",
85 .startup = startup_microdev_irq,
86 .shutdown = shutdown_microdev_irq,
87 .enable = enable_microdev_irq,
88 .disable = disable_microdev_irq,
89 .ack = mask_and_ack_microdev,
90 .end = end_microdev_irq
91};
92
93static void disable_microdev_irq(unsigned int irq)
94{
95 unsigned int fpgaIrq;
96
97 if (irq >= NUM_EXTERNAL_IRQS)
98 return;
99 if (!fpgaIrqTable[irq].mapped)
100 return;
101
102 fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
103
104 /* disable interrupts on the FPGA INTC register */
105 ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
106}
107
108static void enable_microdev_irq(unsigned int irq)
109{
110 unsigned long priorityReg, priorities, pri;
111 unsigned int fpgaIrq;
112
113 if (unlikely(irq >= NUM_EXTERNAL_IRQS))
114 return;
115 if (unlikely(!fpgaIrqTable[irq].mapped))
116 return;
117
118 pri = 15 - irq;
119
120 fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
121 priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
122
123 /* set priority for the interrupt */
124 priorities = ctrl_inl(priorityReg);
125 priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
126 priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
127 ctrl_outl(priorities, priorityReg);
128
129 /* enable interrupts on the FPGA INTC register */
130 ctrl_outl(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
131}
132
133 /* This functions sets the desired irq handler to be a MicroDev type */
134static void __init make_microdev_irq(unsigned int irq)
135{
136 disable_irq_nosync(irq);
137 irq_desc[irq].chip = &microdev_irq_type;
138 disable_microdev_irq(irq);
139}
140
141static void mask_and_ack_microdev(unsigned int irq)
142{
143 disable_microdev_irq(irq);
144}
145
146static void end_microdev_irq(unsigned int irq)
147{
148 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
149 enable_microdev_irq(irq);
150}
151
152extern void __init init_microdev_irq(void)
153{
154 int i;
155
156 /* disable interrupts on the FPGA INTC register */
157 ctrl_outl(~0ul, MICRODEV_FPGA_INTDSB_REG);
158
159 for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
160 make_microdev_irq(i);
161}
162
163extern void microdev_print_fpga_intc_status(void)
164{
165 volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
166 volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
167 volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
168 volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
169 volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
170 volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
171 volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
172 volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
173
174 printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
175 printk("FPGA_INTENB = 0x%08x\n", *intenb);
176 printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
177 printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
178 printk("FPGA_INTREQ = 0x%08x\n", *intreq);
179 printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
180 printk("-------------------------------------------------------------------------------\n");
181}
182
183
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