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