aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/boards/mach-microdev/irq.c
blob: 4fb00369f0e2ebde486ccb67b68897198a423b0d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/*
 * arch/sh/boards/superh/microdev/irq.c
 *
 * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
 *
 * SuperH SH4-202 MicroDev board support.
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 */

#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <asm/io.h>
#include <mach/microdev.h>

#define NUM_EXTERNAL_IRQS 16	/* IRL0 .. IRL15 */

static const struct {
	unsigned char fpgaIrq;
	unsigned char mapped;
	const char *name;
} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
	{ 0,				0,	"unused"   },		/* IRQ #0	IRL=15	0x200  */
	{ MICRODEV_FPGA_IRQ_KEYBOARD,	1,	"keyboard" },		/* IRQ #1	IRL=14	0x220  */
	{ MICRODEV_FPGA_IRQ_SERIAL1,	1,	"Serial #1"},		/* IRQ #2	IRL=13	0x240  */
	{ MICRODEV_FPGA_IRQ_ETHERNET,	1,	"Ethernet" },		/* IRQ #3	IRL=12	0x260  */
	{ MICRODEV_FPGA_IRQ_SERIAL2,	0,	"Serial #2"},		/* IRQ #4	IRL=11	0x280  */
	{ 0,				0,	"unused"   },		/* IRQ #5	IRL=10	0x2a0  */
	{ 0,				0,	"unused"   },		/* IRQ #6	IRL=9	0x2c0  */
	{ MICRODEV_FPGA_IRQ_USB_HC,	1,	"USB"	   },		/* IRQ #7	IRL=8	0x2e0  */
	{ MICRODEV_IRQ_PCI_INTA,	1,	"PCI INTA" },		/* IRQ #8	IRL=7	0x300  */
	{ MICRODEV_IRQ_PCI_INTB,	1,	"PCI INTB" },		/* IRQ #9	IRL=6	0x320  */
	{ MICRODEV_IRQ_PCI_INTC,	1,	"PCI INTC" },		/* IRQ #10	IRL=5	0x340  */
	{ MICRODEV_IRQ_PCI_INTD,	1,	"PCI INTD" },		/* IRQ #11	IRL=4	0x360  */
	{ MICRODEV_FPGA_IRQ_MOUSE,	1,	"mouse"    },		/* IRQ #12	IRL=3	0x380  */
	{ MICRODEV_FPGA_IRQ_IDE2,	1,	"IDE #2"   },		/* IRQ #13	IRL=2	0x3a0  */
	{ MICRODEV_FPGA_IRQ_IDE1,	1,	"IDE #1"   },		/* IRQ #14	IRL=1	0x3c0  */
	{ 0,				0,	"unused"   },		/* IRQ #15	IRL=0	0x3e0  */
};

#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
#  error Inconsistancy in defining the IRQ# for Keyboard!
#endif

#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
#  error Inconsistancy in defining the IRQ# for Ethernet!
#endif

#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
#  error Inconsistancy in defining the IRQ# for USB!
#endif

#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
#  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
#endif

#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
#  error Inconsistancy in defining the IRQ# for secondary IDE!
#endif

#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
#  error Inconsistancy in defining the IRQ# for primary IDE!
#endif

static void disable_microdev_irq(struct irq_data *data)
{
	unsigned int irq = data->irq;
	unsigned int fpgaIrq;

	if (irq >= NUM_EXTERNAL_IRQS)
		return;
	if (!fpgaIrqTable[irq].mapped)
		return;

	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;

	/* disable interrupts on the FPGA INTC register */
	__raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
}

static void enable_microdev_irq(struct irq_data *data)
{
	unsigned int irq = data->irq;
	unsigned long priorityReg, priorities, pri;
	unsigned int fpgaIrq;

	if (unlikely(irq >= NUM_EXTERNAL_IRQS))
		return;
	if (unlikely(!fpgaIrqTable[irq].mapped))
		return;

	pri = 15 - irq;

	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
	priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);

	/* set priority for the interrupt */
	priorities = __raw_readl(priorityReg);
	priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
	priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
	__raw_writel(priorities, priorityReg);

	/* enable interrupts on the FPGA INTC register */
	__raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
}

static struct irq_chip microdev_irq_type = {
	.name = "MicroDev-IRQ",
	.irq_unmask = enable_microdev_irq,
	.irq_mask = disable_microdev_irq,
};

/* This function sets the desired irq handler to be a MicroDev type */
static void __init make_microdev_irq(unsigned int irq)
{
	disable_irq_nosync(irq);
	irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
	disable_microdev_irq(irq_get_irq_data(irq));
}

extern void __init init_microdev_irq(void)
{
	int i;

	/* disable interrupts on the FPGA INTC register */
	__raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);

	for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
		make_microdev_irq(i);
}

extern void microdev_print_fpga_intc_status(void)
{
	volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
	volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
	volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
	volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
	volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
	volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
	volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
	volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;

	printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
	printk("FPGA_INTENB = 0x%08x\n", *intenb);
	printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
	printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
	printk("FPGA_INTREQ = 0x%08x\n", *intreq);
	printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
	printk("-------------------------------------------------------------------------------\n");
}