1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/boards/superh/microdev/irq.c
4  *
5  * Copyright (C) 2003 Sean McGoogan (Sean.McGoogan@superh.com)
6  *
7  * SuperH SH4-202 MicroDev board support.
8  */
9 
10 #include <linux/init.h>
11 #include <linux/irq.h>
12 #include <linux/interrupt.h>
13 #include <asm/io.h>
14 #include <mach/microdev.h>
15 
16 #define NUM_EXTERNAL_IRQS 16	/* IRL0 .. IRL15 */
17 
18 static const struct {
19 	unsigned char fpgaIrq;
20 	unsigned char mapped;
21 	const char *name;
22 } fpgaIrqTable[NUM_EXTERNAL_IRQS] = {
23 	{ 0,				0,	"unused"   },		/* IRQ #0	IRL=15	0x200  */
24 	{ MICRODEV_FPGA_IRQ_KEYBOARD,	1,	"keyboard" },		/* IRQ #1	IRL=14	0x220  */
25 	{ MICRODEV_FPGA_IRQ_SERIAL1,	1,	"Serial #1"},		/* IRQ #2	IRL=13	0x240  */
26 	{ MICRODEV_FPGA_IRQ_ETHERNET,	1,	"Ethernet" },		/* IRQ #3	IRL=12	0x260  */
27 	{ MICRODEV_FPGA_IRQ_SERIAL2,	0,	"Serial #2"},		/* IRQ #4	IRL=11	0x280  */
28 	{ 0,				0,	"unused"   },		/* IRQ #5	IRL=10	0x2a0  */
29 	{ 0,				0,	"unused"   },		/* IRQ #6	IRL=9	0x2c0  */
30 	{ MICRODEV_FPGA_IRQ_USB_HC,	1,	"USB"	   },		/* IRQ #7	IRL=8	0x2e0  */
31 	{ MICRODEV_IRQ_PCI_INTA,	1,	"PCI INTA" },		/* IRQ #8	IRL=7	0x300  */
32 	{ MICRODEV_IRQ_PCI_INTB,	1,	"PCI INTB" },		/* IRQ #9	IRL=6	0x320  */
33 	{ MICRODEV_IRQ_PCI_INTC,	1,	"PCI INTC" },		/* IRQ #10	IRL=5	0x340  */
34 	{ MICRODEV_IRQ_PCI_INTD,	1,	"PCI INTD" },		/* IRQ #11	IRL=4	0x360  */
35 	{ MICRODEV_FPGA_IRQ_MOUSE,	1,	"mouse"    },		/* IRQ #12	IRL=3	0x380  */
36 	{ MICRODEV_FPGA_IRQ_IDE2,	1,	"IDE #2"   },		/* IRQ #13	IRL=2	0x3a0  */
37 	{ MICRODEV_FPGA_IRQ_IDE1,	1,	"IDE #1"   },		/* IRQ #14	IRL=1	0x3c0  */
38 	{ 0,				0,	"unused"   },		/* IRQ #15	IRL=0	0x3e0  */
39 };
40 
41 #if (MICRODEV_LINUX_IRQ_KEYBOARD != 1)
42 #  error Inconsistancy in defining the IRQ# for Keyboard!
43 #endif
44 
45 #if (MICRODEV_LINUX_IRQ_ETHERNET != 3)
46 #  error Inconsistancy in defining the IRQ# for Ethernet!
47 #endif
48 
49 #if (MICRODEV_LINUX_IRQ_USB_HC != 7)
50 #  error Inconsistancy in defining the IRQ# for USB!
51 #endif
52 
53 #if (MICRODEV_LINUX_IRQ_MOUSE != 12)
54 #  error Inconsistancy in defining the IRQ# for PS/2 Mouse!
55 #endif
56 
57 #if (MICRODEV_LINUX_IRQ_IDE2 != 13)
58 #  error Inconsistancy in defining the IRQ# for secondary IDE!
59 #endif
60 
61 #if (MICRODEV_LINUX_IRQ_IDE1 != 14)
62 #  error Inconsistancy in defining the IRQ# for primary IDE!
63 #endif
64 
disable_microdev_irq(struct irq_data * data)65 static void disable_microdev_irq(struct irq_data *data)
66 {
67 	unsigned int irq = data->irq;
68 	unsigned int fpgaIrq;
69 
70 	if (irq >= NUM_EXTERNAL_IRQS)
71 		return;
72 	if (!fpgaIrqTable[irq].mapped)
73 		return;
74 
75 	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
76 
77 	/* disable interrupts on the FPGA INTC register */
78 	__raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTDSB_REG);
79 }
80 
enable_microdev_irq(struct irq_data * data)81 static void enable_microdev_irq(struct irq_data *data)
82 {
83 	unsigned int irq = data->irq;
84 	unsigned long priorityReg, priorities, pri;
85 	unsigned int fpgaIrq;
86 
87 	if (unlikely(irq >= NUM_EXTERNAL_IRQS))
88 		return;
89 	if (unlikely(!fpgaIrqTable[irq].mapped))
90 		return;
91 
92 	pri = 15 - irq;
93 
94 	fpgaIrq = fpgaIrqTable[irq].fpgaIrq;
95 	priorityReg = MICRODEV_FPGA_INTPRI_REG(fpgaIrq);
96 
97 	/* set priority for the interrupt */
98 	priorities = __raw_readl(priorityReg);
99 	priorities &= ~MICRODEV_FPGA_INTPRI_MASK(fpgaIrq);
100 	priorities |= MICRODEV_FPGA_INTPRI_LEVEL(fpgaIrq, pri);
101 	__raw_writel(priorities, priorityReg);
102 
103 	/* enable interrupts on the FPGA INTC register */
104 	__raw_writel(MICRODEV_FPGA_INTC_MASK(fpgaIrq), MICRODEV_FPGA_INTENB_REG);
105 }
106 
107 static struct irq_chip microdev_irq_type = {
108 	.name = "MicroDev-IRQ",
109 	.irq_unmask = enable_microdev_irq,
110 	.irq_mask = disable_microdev_irq,
111 };
112 
113 /* This function sets the desired irq handler to be a MicroDev type */
make_microdev_irq(unsigned int irq)114 static void __init make_microdev_irq(unsigned int irq)
115 {
116 	disable_irq_nosync(irq);
117 	irq_set_chip_and_handler(irq, &microdev_irq_type, handle_level_irq);
118 	disable_microdev_irq(irq_get_irq_data(irq));
119 }
120 
init_microdev_irq(void)121 extern void __init init_microdev_irq(void)
122 {
123 	int i;
124 
125 	/* disable interrupts on the FPGA INTC register */
126 	__raw_writel(~0ul, MICRODEV_FPGA_INTDSB_REG);
127 
128 	for (i = 0; i < NUM_EXTERNAL_IRQS; i++)
129 		make_microdev_irq(i);
130 }
131 
microdev_print_fpga_intc_status(void)132 extern void microdev_print_fpga_intc_status(void)
133 {
134 	volatile unsigned int * const intenb = (unsigned int*)MICRODEV_FPGA_INTENB_REG;
135 	volatile unsigned int * const intdsb = (unsigned int*)MICRODEV_FPGA_INTDSB_REG;
136 	volatile unsigned int * const intpria = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(0);
137 	volatile unsigned int * const intprib = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(8);
138 	volatile unsigned int * const intpric = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(16);
139 	volatile unsigned int * const intprid = (unsigned int*)MICRODEV_FPGA_INTPRI_REG(24);
140 	volatile unsigned int * const intsrc = (unsigned int*)MICRODEV_FPGA_INTSRC_REG;
141 	volatile unsigned int * const intreq = (unsigned int*)MICRODEV_FPGA_INTREQ_REG;
142 
143 	printk("-------------------------- microdev_print_fpga_intc_status() ------------------\n");
144 	printk("FPGA_INTENB = 0x%08x\n", *intenb);
145 	printk("FPGA_INTDSB = 0x%08x\n", *intdsb);
146 	printk("FPGA_INTSRC = 0x%08x\n", *intsrc);
147 	printk("FPGA_INTREQ = 0x%08x\n", *intreq);
148 	printk("FPGA_INTPRI[3..0] = %08x:%08x:%08x:%08x\n", *intprid, *intpric, *intprib, *intpria);
149 	printk("-------------------------------------------------------------------------------\n");
150 }
151