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/io.h>
16#include <mach/microdev.h>
17
18#define NUM_EXTERNAL_IRQS 16	/* IRL0 .. IRL15 */
19
20static const struct {
21	unsigned char fpgaIrq;
22	unsigned char mapped;
23	const char *name;
24} fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
25	{ 0,				0,	"unused"   },		/* IRQ #0	IRL=15	0x200  */
26	{ MICRODEV_FPGA_IRQ_KEYBOARD,	1,	"keyboard" },		/* IRQ #1	IRL=14	0x220  */
27	{ MICRODEV_FPGA_IRQ_SERIAL1,	1,	"Serial #1"},		/* IRQ #2	IRL=13	0x240  */
28	{ MICRODEV_FPGA_IRQ_ETHERNET,	1,	"Ethernet" },		/* IRQ #3	IRL=12	0x260  */
29	{ MICRODEV_FPGA_IRQ_SERIAL2,	0,	"Serial #2"},		/* IRQ #4	IRL=11	0x280  */
30	{ 0,				0,	"unused"   },		/* IRQ #5	IRL=10	0x2a0  */
31	{ 0,				0,	"unused"   },		/* IRQ #6	IRL=9	0x2c0  */
32	{ MICRODEV_FPGA_IRQ_USB_HC,	1,	"USB"	   },		/* IRQ #7	IRL=8	0x2e0  */
33	{ MICRODEV_IRQ_PCI_INTA,	1,	"PCI INTA" },		/* IRQ #8	IRL=7	0x300  */
34	{ MICRODEV_IRQ_PCI_INTB,	1,	"PCI INTB" },		/* IRQ #9	IRL=6	0x320  */
35	{ MICRODEV_IRQ_PCI_INTC,	1,	"PCI INTC" },		/* IRQ #10	IRL=5	0x340  */
36	{ MICRODEV_IRQ_PCI_INTD,	1,	"PCI INTD" },		/* IRQ #11	IRL=4	0x360  */
37	{ MICRODEV_FPGA_IRQ_MOUSE,	1,	"mouse"    },		/* IRQ #12	IRL=3	0x380  */
38	{ MICRODEV_FPGA_IRQ_IDE2,	1,	"IDE #2"   },		/* IRQ #13	IRL=2	0x3a0  */
39	{ MICRODEV_FPGA_IRQ_IDE1,	1,	"IDE #1"   },		/* IRQ #14	IRL=1	0x3c0  */
40	{ 0,				0,	"unused"   },		/* IRQ #15	IRL=0	0x3e0  */
41};
42
43#if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
44#  error Inconsistancy in defining the IRQ# for Keyboard!
45#endif
46
47#if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
48#  error Inconsistancy in defining the IRQ# for Ethernet!
49#endif
50
51#if (MICRODEV_LINUX_IRQ_USB_HC != 7)
52#  error Inconsistancy in defining the IRQ# for USB!
53#endif
54
55#if (MICRODEV_LINUX_IRQ_MOUSE != 12)
56#  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
57#endif
58
59#if (MICRODEV_LINUX_IRQ_IDE2 != 13)
60#  error Inconsistancy in defining the IRQ# for secondary IDE!
61#endif
62
63#if (MICRODEV_LINUX_IRQ_IDE1 != 14)
64#  error Inconsistancy in defining the IRQ# for primary IDE!
65#endif
66
67static void disable_microdev_irq(struct irq_data *data)
68{
69	unsigned int irq = data->irq;
70	unsigned int fpgaIrq;
71
72	if (irq >= NUM_EXTERNAL_IRQS)
73		return;
74	if (!fpgaIrqTable[irq].mapped)
75		return;
76
77	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
78
79	/* disable interrupts on the FPGA INTC register */
80	__raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
81}
82
83static void enable_microdev_irq(struct irq_data *data)
84{
85	unsigned int irq = data->irq;
86	unsigned long priorityReg, priorities, pri;
87	unsigned int fpgaIrq;
88
89	if (unlikely(irq >= NUM_EXTERNAL_IRQS))
90		return;
91	if (unlikely(!fpgaIrqTable[irq].mapped))
92		return;
93
94	pri = 15 - irq;
95
96	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
97	priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
98
99	/* set priority for the interrupt */
100	priorities = __raw_readl(priorityReg);
101	priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
102	priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
103	__raw_writel(priorities, priorityReg);
104
105	/* enable interrupts on the FPGA INTC register */
106	__raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
107}
108
109static struct irq_chip microdev_irq_type = {
110	.name = "MicroDev-IRQ",
111	.irq_unmask = enable_microdev_irq,
112	.irq_mask = disable_microdev_irq,
113};
114
115/* This function sets the desired irq handler to be a MicroDev type */
116static void __init make_microdev_irq(unsigned int irq)
117{
118	disable_irq_nosync(irq);
119	irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
120	disable_microdev_irq(irq_get_irq_data(irq));
121}
122
123extern void __init init_microdev_irq(void)
124{
125	int i;
126
127	/* disable interrupts on the FPGA INTC register */
128	__raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
129
130	for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
131		make_microdev_irq(i);
132}
133
134extern void microdev_print_fpga_intc_status(void)
135{
136	volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
137	volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
138	volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
139	volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
140	volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
141	volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
142	volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
143	volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
144
145	printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
146	printk("FPGA_INTENB = 0x%08x\n", *intenb);
147	printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
148	printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
149	printk("FPGA_INTREQ = 0x%08x\n", *intreq);
150	printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
151	printk("-------------------------------------------------------------------------------\n");
152}
153