1/* 2 * $Id: setup.c,v 1.1.1.1 2007/08/03 18:52:15 Exp $ 3 * Copyright (C) 2000 YAEGASHI Takeshi 4 * Hitachi HD64461 companion chip support 5 */ 6 7#include <linux/sched.h> 8#include <linux/module.h> 9#include <linux/kernel.h> 10#include <linux/param.h> 11#include <linux/interrupt.h> 12#include <linux/init.h> 13#include <linux/irq.h> 14#include <asm/io.h> 15#include <asm/irq.h> 16#include <asm/hd64461.h> 17 18static void disable_hd64461_irq(unsigned int irq) 19{ 20 unsigned short nimr; 21 unsigned short mask = 1 << (irq - HD64461_IRQBASE); 22 23 nimr = inw(HD64461_NIMR); 24 nimr |= mask; 25 outw(nimr, HD64461_NIMR); 26} 27 28static void enable_hd64461_irq(unsigned int irq) 29{ 30 unsigned short nimr; 31 unsigned short mask = 1 << (irq - HD64461_IRQBASE); 32 33 nimr = inw(HD64461_NIMR); 34 nimr &= ~mask; 35 outw(nimr, HD64461_NIMR); 36} 37 38static void mask_and_ack_hd64461(unsigned int irq) 39{ 40 disable_hd64461_irq(irq); 41#ifdef CONFIG_HD64461_ENABLER 42 if (irq == HD64461_IRQBASE + 13) 43 outb(0x00, HD64461_PCC1CSCR); 44#endif 45} 46 47static void end_hd64461_irq(unsigned int irq) 48{ 49 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) 50 enable_hd64461_irq(irq); 51} 52 53static unsigned int startup_hd64461_irq(unsigned int irq) 54{ 55 enable_hd64461_irq(irq); 56 return 0; 57} 58 59static void shutdown_hd64461_irq(unsigned int irq) 60{ 61 disable_hd64461_irq(irq); 62} 63 64static struct hw_interrupt_type hd64461_irq_type = { 65 .typename = "HD64461-IRQ", 66 .startup = startup_hd64461_irq, 67 .shutdown = shutdown_hd64461_irq, 68 .enable = enable_hd64461_irq, 69 .disable = disable_hd64461_irq, 70 .ack = mask_and_ack_hd64461, 71 .end = end_hd64461_irq, 72}; 73 74static irqreturn_t hd64461_interrupt(int irq, void *dev_id) 75{ 76 printk(KERN_INFO 77 "HD64461: spurious interrupt, nirr: 0x%x nimr: 0x%x\n", 78 inw(HD64461_NIRR), inw(HD64461_NIMR)); 79 80 return IRQ_NONE; 81} 82 83static struct { 84 int (*func) (int, void *); 85 void *dev; 86} hd64461_demux[HD64461_IRQ_NUM]; 87 88void hd64461_register_irq_demux(int irq, 89 int (*demux) (int irq, void *dev), void *dev) 90{ 91 hd64461_demux[irq - HD64461_IRQBASE].func = demux; 92 hd64461_demux[irq - HD64461_IRQBASE].dev = dev; 93} 94 95EXPORT_SYMBOL(hd64461_register_irq_demux); 96 97void hd64461_unregister_irq_demux(int irq) 98{ 99 hd64461_demux[irq - HD64461_IRQBASE].func = 0; 100} 101 102EXPORT_SYMBOL(hd64461_unregister_irq_demux); 103 104int hd64461_irq_demux(int irq) 105{ 106 if (irq == CONFIG_HD64461_IRQ) { 107 unsigned short bit; 108 unsigned short nirr = inw(HD64461_NIRR); 109 unsigned short nimr = inw(HD64461_NIMR); 110 int i; 111 112 nirr &= ~nimr; 113 for (bit = 1, i = 0; i < 16; bit <<= 1, i++) 114 if (nirr & bit) 115 break; 116 if (i == 16) 117 irq = CONFIG_HD64461_IRQ; 118 else { 119 irq = HD64461_IRQBASE + i; 120 if (hd64461_demux[i].func != 0) { 121 irq = hd64461_demux[i].func(irq, hd64461_demux[i].dev); 122 } 123 } 124 } 125 return __irq_demux(irq); 126} 127 128static struct irqaction irq0 = { hd64461_interrupt, IRQF_DISABLED, CPU_MASK_NONE, "HD64461", NULL, NULL }; 129 130int __init setup_hd64461(void) 131{ 132 int i; 133 134 if (!MACH_HD64461) 135 return 0; 136 137 printk(KERN_INFO 138 "HD64461 configured at 0x%x on irq %d(mapped into %d to %d)\n", 139 CONFIG_HD64461_IOBASE, CONFIG_HD64461_IRQ, HD64461_IRQBASE, 140 HD64461_IRQBASE + 15); 141 142#if defined(CONFIG_CPU_SUBTYPE_SH7709) /* Should be at processor specific part.. */ 143 outw(0x2240, INTC_ICR1); 144#endif 145 outw(0xffff, HD64461_NIMR); 146 147 for (i = HD64461_IRQBASE; i < HD64461_IRQBASE + 16; i++) { 148 irq_desc[i].chip = &hd64461_irq_type; 149 } 150 151 setup_irq(CONFIG_HD64461_IRQ, &irq0); 152 153#ifdef CONFIG_HD64461_ENABLER 154 printk(KERN_INFO "HD64461: enabling PCMCIA devices\n"); 155 outb(0x4c, HD64461_PCC1CSCIER); 156 outb(0x00, HD64461_PCC1CSCR); 157#endif 158 159 return 0; 160} 161 162module_init(setup_hd64461); 163