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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | /* * 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 <linux/init.h> #include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <asm/irq.h> #include <asm/amigahw.h> #include <asm/amigaints.h> struct ciabase { volatile struct CIA *cia; unsigned char icr_mask, icr_data; unsigned short int_mask; int handler_irq, cia_irq, server_irq; char *name; } ciaa_base = { .cia = &ciaa, .int_mask = IF_PORTS, .handler_irq = IRQ_AMIGA_PORTS, .cia_irq = IRQ_AMIGA_CIAA, .name = "CIAA" }, ciab_base = { .cia = &ciab, .int_mask = IF_EXTER, .handler_irq = IRQ_AMIGA_EXTER, .cia_irq = IRQ_AMIGA_CIAB, .name = "CIAB" }; /* * Cause or clear CIA interrupts, return old interrupt status. */ unsigned char cia_set_irq(struct ciabase *base, unsigned char mask) { unsigned 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) amiga_custom.intreq = IF_SETCLR | base->int_mask; return old & base->icr_mask; } /* * Enable or disable CIA interrupts, return old interrupt mask, */ unsigned char cia_able_irq(struct ciabase *base, unsigned char mask) { unsigned char old; 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; if (base->icr_data & base->icr_mask) amiga_custom.intreq = IF_SETCLR | base->int_mask; return old; } static irqreturn_t cia_handler(int irq, void *dev_id) { struct ciabase *base = dev_id; int mach_irq; unsigned char ints; unsigned long flags; /* Interrupts get disabled while the timer irq flag is cleared and * the timer interrupt serviced. */ mach_irq = base->cia_irq; local_irq_save(flags); ints = cia_set_irq(base, CIA_ICR_ALL); amiga_custom.intreq = base->int_mask; if (ints & 1) generic_handle_irq(mach_irq); local_irq_restore(flags); mach_irq++, ints >>= 1; for (; ints; mach_irq++, ints >>= 1) { if (ints & 1) generic_handle_irq(mach_irq); } return IRQ_HANDLED; } static void cia_irq_enable(struct irq_data *data) { unsigned int irq = data->irq; unsigned char mask; if (irq >= IRQ_AMIGA_CIAB) { mask = 1 << (irq - IRQ_AMIGA_CIAB); cia_set_irq(&ciab_base, mask); cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask); } else { mask = 1 << (irq - IRQ_AMIGA_CIAA); cia_set_irq(&ciaa_base, mask); cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask); } } static void cia_irq_disable(struct irq_data *data) { unsigned int irq = data->irq; if (irq >= IRQ_AMIGA_CIAB) cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB)); else cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA)); } static struct irq_chip cia_irq_chip = { .name = "cia", .irq_enable = cia_irq_enable, .irq_disable = cia_irq_disable, }; /* * Override auto irq 2 & 6 and use them as general chain * for external interrupts, we link the CIA interrupt sources * into this chain. */ static void auto_irq_enable(struct irq_data *data) { switch (data->irq) { case IRQ_AUTO_2: amiga_custom.intena = IF_SETCLR | IF_PORTS; break; case IRQ_AUTO_6: amiga_custom.intena = IF_SETCLR | IF_EXTER; break; } } static void auto_irq_disable(struct irq_data *data) { switch (data->irq) { case IRQ_AUTO_2: amiga_custom.intena = IF_PORTS; break; case IRQ_AUTO_6: amiga_custom.intena = IF_EXTER; break; } } static struct irq_chip auto_irq_chip = { .name = "auto", .irq_enable = auto_irq_enable, .irq_disable = auto_irq_disable, }; void __init cia_init_IRQ(struct ciabase *base) { m68k_setup_irq_controller(&cia_irq_chip, handle_simple_irq, base->cia_irq, CIA_IRQS); /* clear any pending interrupt and turn off all interrupts */ cia_set_irq(base, CIA_ICR_ALL); cia_able_irq(base, CIA_ICR_ALL); /* override auto int and install CIA handler */ m68k_setup_irq_controller(&auto_irq_chip, handle_simple_irq, base->handler_irq, 1); m68k_irq_startup_irq(base->handler_irq); if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED, base->name, base)) pr_err("Couldn't register %s interrupt\n", base->name); } |