mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-08 05:06:41 +07:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
181 lines
4.4 KiB
C
181 lines
4.4 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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irq_handler_t irq_list[CIA_IRQS];
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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_AUTO_2,
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.cia_irq = IRQ_AMIGA_CIAA,
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.server_irq = IRQ_AMIGA_PORTS,
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.name = "CIAA handler"
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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_AUTO_6,
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.cia_irq = IRQ_AMIGA_CIAB,
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.server_irq = IRQ_AMIGA_EXTER,
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.name = "CIAB handler"
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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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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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* interrupts will only be enabled if a handler exists
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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, tmp;
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int i;
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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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for (i = 0, tmp = 1; i < CIA_IRQS; i++, tmp <<= 1) {
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if ((tmp & base->icr_mask) && !base->irq_list[i].handler) {
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base->icr_mask &= ~tmp;
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base->cia->icr = tmp;
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}
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}
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if (base->icr_data & base->icr_mask)
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custom.intreq = IF_SETCLR | base->int_mask;
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return old;
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}
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int cia_request_irq(struct ciabase *base, unsigned int irq,
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irqreturn_t (*handler)(int, void *, struct pt_regs *),
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unsigned long flags, const char *devname, void *dev_id)
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{
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unsigned char mask;
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base->irq_list[irq].handler = handler;
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base->irq_list[irq].flags = flags;
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base->irq_list[irq].dev_id = dev_id;
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base->irq_list[irq].devname = devname;
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/* enable the interrupt */
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mask = 1 << irq;
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cia_set_irq(base, mask);
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cia_able_irq(base, CIA_ICR_SETCLR | mask);
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return 0;
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}
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void cia_free_irq(struct ciabase *base, unsigned int irq, void *dev_id)
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{
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if (base->irq_list[irq].dev_id != dev_id)
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printk("%s: removing probably wrong IRQ %i from %s\n",
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__FUNCTION__, base->cia_irq + irq,
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base->irq_list[irq].devname);
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base->irq_list[irq].handler = NULL;
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base->irq_list[irq].flags = 0;
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cia_able_irq(base, 1 << irq);
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}
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static irqreturn_t cia_handler(int irq, void *dev_id, struct pt_regs *fp)
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{
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struct ciabase *base = (struct ciabase *)dev_id;
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int mach_irq, i;
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unsigned char ints;
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mach_irq = base->cia_irq;
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irq = SYS_IRQS + mach_irq;
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ints = cia_set_irq(base, CIA_ICR_ALL);
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custom.intreq = base->int_mask;
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for (i = 0; i < CIA_IRQS; i++, irq++, mach_irq++) {
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if (ints & 1) {
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kstat_cpu(0).irqs[irq]++;
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base->irq_list[i].handler(mach_irq, base->irq_list[i].dev_id, fp);
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}
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ints >>= 1;
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}
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amiga_do_irq_list(base->server_irq, fp);
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return IRQ_HANDLED;
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}
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void __init cia_init_IRQ(struct ciabase *base)
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{
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int i;
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/* init isr handlers */
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for (i = 0; i < CIA_IRQS; i++) {
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base->irq_list[i].handler = NULL;
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base->irq_list[i].flags = 0;
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}
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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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/* install CIA handler */
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request_irq(base->handler_irq, cia_handler, 0, base->name, base);
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custom.intena = IF_SETCLR | base->int_mask;
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}
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int cia_get_irq_list(struct ciabase *base, struct seq_file *p)
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{
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int i, j;
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j = base->cia_irq;
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for (i = 0; i < CIA_IRQS; i++) {
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seq_printf(p, "cia %2d: %10d ", j + i,
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kstat_cpu(0).irqs[SYS_IRQS + j + i]);
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seq_puts(p, " ");
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seq_printf(p, "%s\n", base->irq_list[i].devname);
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}
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return 0;
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}
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