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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | /* * linux/arch/m68k/amiga/cia.c - CIA support * * Copyright (C) 1996 Roman Zippel * * The concept of some functions bases on the original Amiga OS function * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/errno.h> #include <linux/kernel_stat.h> #include <asm/irq.h> #include <asm/amigahw.h> #include <asm/amigaints.h> struct ciabase { volatile struct CIA *cia; u_char icr_mask, icr_data; u_short int_mask; int handler_irq, cia_irq, server_irq; char *name; struct irq_server server; irq_handler_t irq_list[CIA_IRQS]; } ciaa_base = { &ciaa, 0, 0, IF_PORTS, IRQ2, IRQ_AMIGA_CIAA, IRQ_IDX(IRQ_AMIGA_PORTS), "CIAA handler", {0, 0} }, ciab_base = { &ciab, 0, 0, IF_EXTER, IRQ6, IRQ_AMIGA_CIAB, IRQ_IDX(IRQ_AMIGA_EXTER), "CIAB handler", {0, 0} }; /* * Cause or clear CIA interrupts, return old interrupt status. */ unsigned char cia_set_irq(struct ciabase *base, unsigned char mask) { u_char old; old = (base->icr_data |= base->cia->icr); if (mask & CIA_ICR_SETCLR) base->icr_data |= mask; else base->icr_data &= ~mask; if (base->icr_data & base->icr_mask) custom.intreq = IF_SETCLR | base->int_mask; return (old & base->icr_mask); } /* * Enable or disable CIA interrupts, return old interrupt mask, * interrupts will only be enabled if a handler exists */ unsigned char cia_able_irq(struct ciabase *base, unsigned char mask) { u_char old, tmp; int i; old = base->icr_mask; base->icr_data |= base->cia->icr; base->cia->icr = mask; if (mask & CIA_ICR_SETCLR) base->icr_mask |= mask; else base->icr_mask &= ~mask; base->icr_mask &= CIA_ICR_ALL; for (i = 0, tmp = 1; i < CIA_IRQS; i++, tmp <<= 1) { if ((tmp & base->icr_mask) && !base->irq_list[i].handler) base->icr_mask &= ~tmp; } if (base->icr_data & base->icr_mask) custom.intreq = IF_SETCLR | base->int_mask; return (old); } int cia_request_irq(struct ciabase *base, unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id) { u_char mask; if (!(base->irq_list[irq].flags & IRQ_FLG_STD)) { if (base->irq_list[irq].flags & IRQ_FLG_LOCK) { printk("%s: IRQ %ld from %s is not replaceable\n", __FUNCTION__, IRQ_IDX(base->cia_irq + irq), base->irq_list[irq].devname); return -EBUSY; } if (flags & IRQ_FLG_REPLACE) { printk("%s: %s can't replace IRQ %ld from %s\n", __FUNCTION__, devname, IRQ_IDX(base->cia_irq + irq), base->irq_list[irq].devname); return -EBUSY; } } base->irq_list[irq].handler = handler; base->irq_list[irq].flags = flags; base->irq_list[irq].dev_id = dev_id; base->irq_list[irq].devname = devname; /* enable the interrupt */ mask = 1 << irq; cia_set_irq(base, mask); cia_able_irq(base, CIA_ICR_SETCLR | mask); return 0; } void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id) { if (base->irq_list[irq].dev_id != dev_id) printk("%s: removing probably wrong IRQ %ld from %s\n", __FUNCTION__, IRQ_IDX(base->cia_irq + irq), base->irq_list[irq].devname); base->irq_list[irq].handler = NULL; base->irq_list[irq].flags = IRQ_FLG_STD; cia_able_irq(base, 1 << irq); } static void cia_handler(int irq, void *dev_id, struct pt_regs *fp) { struct ciabase *base = (struct ciabase *)dev_id; int mach_irq, i; unsigned char ints; mach_irq = base->cia_irq; irq = SYS_IRQS + IRQ_IDX(mach_irq); ints = cia_set_irq(base, CIA_ICR_ALL); custom.intreq = base->int_mask; for (i = 0; i < CIA_IRQS; i++, irq++, mach_irq++) { if (ints & 1) { kstat.interrupts[irq]++; base->irq_list[i].handler(mach_irq, base->irq_list[i].dev_id, fp); } ints >>= 1; } amiga_do_irq_list(base->server_irq, fp, &base->server); } void cia_init_IRQ(struct ciabase *base) { int i; /* init isr handlers */ for (i = 0; i < CIA_IRQS; i++) { base->irq_list[i].handler = NULL; base->irq_list[i].flags = IRQ_FLG_STD; } /* clear any pending interrupt and turn off all interrupts */ cia_set_irq(base, CIA_ICR_ALL); cia_able_irq(base, CIA_ICR_ALL); /* install CIA handler */ request_irq(base->handler_irq, cia_handler, IRQ_FLG_LOCK, base->name, base); custom.intena = IF_SETCLR | base->int_mask; } int cia_get_irq_list(struct ciabase *base, char *buf) { int i, j, len = 0; j = IRQ_IDX(base->cia_irq); for (i = 0; i < CIA_IRQS; i++) { if (!(base->irq_list[i].flags & IRQ_FLG_STD)) { len += sprintf(buf+len, "cia %2d: %10d ", j + i, kstat.interrupts[SYS_IRQS + j + i]); if (base->irq_list[i].flags & IRQ_FLG_LOCK) len += sprintf(buf+len, "L "); else len += sprintf(buf+len, " "); len += sprintf(buf+len, "%s\n", base->irq_list[i].devname); } } return len; } |