![Geert Uytterhoeven](/assets/img/avatar_default.png)
warning: ignoring return value of 'request_irq', declared with attribute warn_unused_result Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
183 lines
4.2 KiB
C
183 lines
4.2 KiB
C
/*
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* linux/arch/m68k/amiga/cia.c - CIA support
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*
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* Copyright (C) 1996 Roman Zippel
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*
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* The concept of some functions bases on the original Amiga OS function
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <asm/irq.h>
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#include <asm/amigahw.h>
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#include <asm/amigaints.h>
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struct ciabase {
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volatile struct CIA *cia;
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unsigned char icr_mask, icr_data;
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unsigned short int_mask;
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int handler_irq, cia_irq, server_irq;
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char *name;
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} ciaa_base = {
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.cia = &ciaa,
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.int_mask = IF_PORTS,
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.handler_irq = IRQ_AMIGA_PORTS,
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.cia_irq = IRQ_AMIGA_CIAA,
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.name = "CIAA"
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}, ciab_base = {
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.cia = &ciab,
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.int_mask = IF_EXTER,
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.handler_irq = IRQ_AMIGA_EXTER,
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.cia_irq = IRQ_AMIGA_CIAB,
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.name = "CIAB"
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};
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/*
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* Cause or clear CIA interrupts, return old interrupt status.
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*/
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unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
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{
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unsigned char old;
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old = (base->icr_data |= base->cia->icr);
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if (mask & CIA_ICR_SETCLR)
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base->icr_data |= mask;
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else
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base->icr_data &= ~mask;
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if (base->icr_data & base->icr_mask)
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amiga_custom.intreq = IF_SETCLR | base->int_mask;
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return old & base->icr_mask;
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}
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/*
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* Enable or disable CIA interrupts, return old interrupt mask,
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*/
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unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
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{
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unsigned char old;
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old = base->icr_mask;
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base->icr_data |= base->cia->icr;
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base->cia->icr = mask;
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if (mask & CIA_ICR_SETCLR)
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base->icr_mask |= mask;
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else
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base->icr_mask &= ~mask;
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base->icr_mask &= CIA_ICR_ALL;
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if (base->icr_data & base->icr_mask)
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amiga_custom.intreq = IF_SETCLR | base->int_mask;
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return old;
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}
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static irqreturn_t cia_handler(int irq, void *dev_id)
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{
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struct ciabase *base = dev_id;
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int mach_irq;
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unsigned char ints;
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mach_irq = base->cia_irq;
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ints = cia_set_irq(base, CIA_ICR_ALL);
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amiga_custom.intreq = base->int_mask;
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for (; ints; mach_irq++, ints >>= 1) {
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if (ints & 1)
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m68k_handle_int(mach_irq);
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}
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return IRQ_HANDLED;
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}
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static void cia_enable_irq(unsigned int irq)
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{
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unsigned char mask;
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if (irq >= IRQ_AMIGA_CIAB) {
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mask = 1 << (irq - IRQ_AMIGA_CIAB);
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cia_set_irq(&ciab_base, mask);
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cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask);
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} else {
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mask = 1 << (irq - IRQ_AMIGA_CIAA);
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cia_set_irq(&ciaa_base, mask);
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cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask);
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}
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}
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static void cia_disable_irq(unsigned int irq)
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{
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if (irq >= IRQ_AMIGA_CIAB)
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cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
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else
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cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
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}
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static struct irq_controller cia_irq_controller = {
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.name = "cia",
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.lock = __SPIN_LOCK_UNLOCKED(cia_irq_controller.lock),
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.enable = cia_enable_irq,
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.disable = cia_disable_irq,
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};
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/*
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* Override auto irq 2 & 6 and use them as general chain
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* for external interrupts, we link the CIA interrupt sources
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* into this chain.
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*/
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static void auto_enable_irq(unsigned int irq)
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{
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switch (irq) {
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case IRQ_AUTO_2:
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amiga_custom.intena = IF_SETCLR | IF_PORTS;
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break;
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case IRQ_AUTO_6:
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amiga_custom.intena = IF_SETCLR | IF_EXTER;
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break;
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}
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}
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static void auto_disable_irq(unsigned int irq)
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{
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switch (irq) {
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case IRQ_AUTO_2:
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amiga_custom.intena = IF_PORTS;
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break;
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case IRQ_AUTO_6:
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amiga_custom.intena = IF_EXTER;
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break;
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}
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}
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static struct irq_controller auto_irq_controller = {
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.name = "auto",
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.lock = __SPIN_LOCK_UNLOCKED(auto_irq_controller.lock),
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.enable = auto_enable_irq,
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.disable = auto_disable_irq,
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};
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void __init cia_init_IRQ(struct ciabase *base)
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{
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m68k_setup_irq_controller(&cia_irq_controller, base->cia_irq, CIA_IRQS);
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/* clear any pending interrupt and turn off all interrupts */
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cia_set_irq(base, CIA_ICR_ALL);
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cia_able_irq(base, CIA_ICR_ALL);
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/* override auto int and install CIA handler */
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m68k_setup_irq_controller(&auto_irq_controller, base->handler_irq, 1);
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m68k_irq_startup(base->handler_irq);
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if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED,
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base->name, base))
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pr_err("Couldn't register %s interrupt\n", base->name);
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}
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