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
 18static 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
 65static 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
 81static 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
107static 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 */
114static 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
121extern 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
132extern 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}