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, µdev_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} 151