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macfb: add vertical blank interrupt

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The MacOS driver expects a 60.15Hz vertical blank interrupt to be generated by
the framebuffer which in turn schedules the mouse driver via the Vertical Retrace
Manager.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211007221253.29024-13-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2021-10-07 23:12:52 +01:00 committed by Laurent Vivier
parent 432d59c56e
commit c7a2f7ba0c
2 changed files with 91 additions and 0 deletions
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83
hw/display/macfb.c
View file

@ -33,9 +33,16 @@
#define DAFB_MODE_CTRL1 0x8
#define DAFB_MODE_CTRL2 0xc
#define DAFB_MODE_SENSE 0x1c
#define DAFB_INTR_MASK 0x104
#define DAFB_INTR_STAT 0x108
#define DAFB_INTR_CLEAR 0x10c
#define DAFB_RESET 0x200
#define DAFB_LUT 0x213
#define DAFB_INTR_VBL 0x4
/* Vertical Blank period (60.15Hz) */
#define DAFB_INTR_VBL_PERIOD_NS 16625800
/*
* Quadra sense codes taken from Apple Technical Note HW26:
@ -470,6 +477,36 @@ static void macfb_update_display(void *opaque)
macfb_draw_graphic(s);
}
static void macfb_update_irq(MacfbState *s)
{
uint32_t irq_state = s->irq_state & s->irq_mask;
if (irq_state) {
qemu_irq_raise(s->irq);
} else {
qemu_irq_lower(s->irq);
}
}
static int64_t macfb_next_vbl(void)
{
return (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + DAFB_INTR_VBL_PERIOD_NS) /
DAFB_INTR_VBL_PERIOD_NS * DAFB_INTR_VBL_PERIOD_NS;
}
static void macfb_vbl_timer(void *opaque)
{
MacfbState *s = opaque;
int64_t next_vbl;
s->irq_state |= DAFB_INTR_VBL;
macfb_update_irq(s);
/* 60 Hz irq */
next_vbl = macfb_next_vbl();
timer_mod(s->vbl_timer, next_vbl);
}
static void macfb_reset(MacfbState *s)
{
int i;
@ -498,6 +535,9 @@ static uint64_t macfb_ctrl_read(void *opaque,
case DAFB_MODE_CTRL2:
val = s->regs[addr >> 2];
break;
case DAFB_INTR_STAT:
val = s->irq_state;
break;
case DAFB_MODE_SENSE:
val = macfb_sense_read(s);
break;
@ -513,6 +553,8 @@ static void macfb_ctrl_write(void *opaque,
unsigned int size)
{
MacfbState *s = opaque;
int64_t next_vbl;
switch (addr) {
case DAFB_MODE_VADDR1:
case DAFB_MODE_VADDR2:
@ -528,8 +570,23 @@ static void macfb_ctrl_write(void *opaque,
case DAFB_MODE_SENSE:
macfb_sense_write(s, val);
break;
case DAFB_INTR_MASK:
s->irq_mask = val;
if (val & DAFB_INTR_VBL) {
next_vbl = macfb_next_vbl();
timer_mod(s->vbl_timer, next_vbl);
} else {
timer_del(s->vbl_timer);
}
break;
case DAFB_INTR_CLEAR:
s->irq_state &= ~DAFB_INTR_VBL;
macfb_update_irq(s);
break;
case DAFB_RESET:
s->palette_current = 0;
s->irq_state &= ~DAFB_INTR_VBL;
macfb_update_irq(s);
break;
case DAFB_LUT:
s->color_palette[s->palette_current] = val;
@ -611,6 +668,7 @@ static bool macfb_common_realize(DeviceState *dev, MacfbState *s, Error **errp)
s->vram_bit_mask = MACFB_VRAM_SIZE - 1;
memory_region_set_coalescing(&s->mem_vram);
s->vbl_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, macfb_vbl_timer, s);
macfb_update_mode(s);
return true;
}
@ -626,6 +684,16 @@ static void macfb_sysbus_realize(DeviceState *dev, Error **errp)
sysbus_init_mmio(SYS_BUS_DEVICE(s), &ms->mem_ctrl);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &ms->mem_vram);
qdev_init_gpio_out(dev, &ms->irq, 1);
}
static void macfb_nubus_set_irq(void *opaque, int n, int level)
{
MacfbNubusState *s = NUBUS_MACFB(opaque);
NubusDevice *nd = NUBUS_DEVICE(s);
nubus_set_irq(nd, level);
}
static void macfb_nubus_realize(DeviceState *dev, Error **errp)
@ -646,6 +714,19 @@ static void macfb_nubus_realize(DeviceState *dev, Error **errp)
memory_region_add_subregion(&nd->slot_mem, DAFB_BASE, &ms->mem_ctrl);
memory_region_add_subregion(&nd->slot_mem, VIDEO_BASE, &ms->mem_vram);
ms->irq = qemu_allocate_irq(macfb_nubus_set_irq, s, 0);
}
static void macfb_nubus_unrealize(DeviceState *dev)
{
MacfbNubusState *s = NUBUS_MACFB(dev);
MacfbNubusDeviceClass *ndc = NUBUS_MACFB_GET_CLASS(dev);
MacfbState *ms = &s->macfb;
ndc->parent_unrealize(dev);
qemu_free_irq(ms->irq);
}
static void macfb_sysbus_reset(DeviceState *d)
@ -696,6 +777,8 @@ static void macfb_nubus_class_init(ObjectClass *klass, void *data)
device_class_set_parent_realize(dc, macfb_nubus_realize,
&ndc->parent_realize);
device_class_set_parent_unrealize(dc, macfb_nubus_unrealize,
&ndc->parent_unrealize);
dc->desc = "Nubus Macintosh framebuffer";
dc->reset = macfb_nubus_reset;
dc->vmsd = &vmstate_macfb;

8
include/hw/display/macfb.h
View file

@ -14,7 +14,9 @@
#define MACFB_H
#include "exec/memory.h"
#include "hw/irq.h"
#include "ui/console.h"
#include "qemu/timer.h"
#include "qom/object.h"
typedef enum {
@ -63,6 +65,11 @@ typedef struct MacfbState {
uint32_t regs[MACFB_NUM_REGS];
MacFbMode *mode;
uint32_t irq_state;
uint32_t irq_mask;
QEMUTimer *vbl_timer;
qemu_irq irq;
} MacfbState;
#define TYPE_MACFB "sysbus-macfb"
@ -81,6 +88,7 @@ struct MacfbNubusDeviceClass {
DeviceClass parent_class;
DeviceRealize parent_realize;
DeviceUnrealize parent_unrealize;
};