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qemu/hw/dma/bcm2835_dma.c
Bernhard Beschow 5e78c98b7c Mark remaining global TypeInfo instances as const 
More than 1k of TypeInfo instances are already marked as const. Mark the
remaining ones, too.

This commit was created with:
  git grep -z -l 'static TypeInfo' -- '*.c' | \
  xargs -0 sed -i 's/static TypeInfo/static const TypeInfo/'

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Message-id: 20220117145805.173070-2-shentey@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2022-02-21 13:30:20 +00:00

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/*
* Raspberry Pi emulation (c) 2012 Gregory Estrade
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/dma/bcm2835_dma.h"
#include "hw/irq.h"
#include "migration/vmstate.h"
#include "qemu/log.h"
#include "qemu/module.h"
/* DMA CS Control and Status bits */
#define BCM2708_DMA_ACTIVE (1 << 0)
#define BCM2708_DMA_END (1 << 1) /* GE */
#define BCM2708_DMA_INT (1 << 2)
#define BCM2708_DMA_ISPAUSED (1 << 4) /* Pause requested or not active */
#define BCM2708_DMA_ISHELD (1 << 5) /* Is held by DREQ flow control */
#define BCM2708_DMA_ERR (1 << 8)
#define BCM2708_DMA_ABORT (1 << 30) /* stop current CB, go to next, WO */
#define BCM2708_DMA_RESET (1 << 31) /* WO, self clearing */
/* DMA control block "info" field bits */
#define BCM2708_DMA_INT_EN (1 << 0)
#define BCM2708_DMA_TDMODE (1 << 1)
#define BCM2708_DMA_WAIT_RESP (1 << 3)
#define BCM2708_DMA_D_INC (1 << 4)
#define BCM2708_DMA_D_WIDTH (1 << 5)
#define BCM2708_DMA_D_DREQ (1 << 6)
#define BCM2708_DMA_D_IGNORE (1 << 7)
#define BCM2708_DMA_S_INC (1 << 8)
#define BCM2708_DMA_S_WIDTH (1 << 9)
#define BCM2708_DMA_S_DREQ (1 << 10)
#define BCM2708_DMA_S_IGNORE (1 << 11)
/* Register offsets */
#define BCM2708_DMA_CS 0x00 /* Control and Status */
#define BCM2708_DMA_ADDR 0x04 /* Control block address */
/* the current control block appears in the following registers - read only */
#define BCM2708_DMA_INFO 0x08
#define BCM2708_DMA_SOURCE_AD 0x0c
#define BCM2708_DMA_DEST_AD 0x10
#define BCM2708_DMA_TXFR_LEN 0x14
#define BCM2708_DMA_STRIDE 0x18
#define BCM2708_DMA_NEXTCB 0x1C
#define BCM2708_DMA_DEBUG 0x20
#define BCM2708_DMA_INT_STATUS 0xfe0 /* Interrupt status of each channel */
#define BCM2708_DMA_ENABLE 0xff0 /* Global enable bits for each channel */
#define BCM2708_DMA_CS_RW_MASK 0x30ff0001 /* All RW bits in DMA_CS */
static void bcm2835_dma_update(BCM2835DMAState *s, unsigned c)
{
BCM2835DMAChan *ch = &s->chan[c];
uint32_t data, xlen, xlen_td, ylen;
int16_t dst_stride, src_stride;
if (!(s->enable & (1 << c))) {
return;
}
while ((s->enable & (1 << c)) && (ch->conblk_ad != 0)) {
/* CB fetch */
ch->ti = ldl_le_phys(&s->dma_as, ch->conblk_ad);
ch->source_ad = ldl_le_phys(&s->dma_as, ch->conblk_ad + 4);
ch->dest_ad = ldl_le_phys(&s->dma_as, ch->conblk_ad + 8);
ch->txfr_len = ldl_le_phys(&s->dma_as, ch->conblk_ad + 12);
ch->stride = ldl_le_phys(&s->dma_as, ch->conblk_ad + 16);
ch->nextconbk = ldl_le_phys(&s->dma_as, ch->conblk_ad + 20);
ylen = 1;
if (ch->ti & BCM2708_DMA_TDMODE) {
/* 2D transfer mode */
ylen += (ch->txfr_len >> 16) & 0x3fff;
xlen = ch->txfr_len & 0xffff;
dst_stride = ch->stride >> 16;
src_stride = ch->stride & 0xffff;
} else {
xlen = ch->txfr_len;
dst_stride = 0;
src_stride = 0;
}
xlen_td = xlen;
while (ylen != 0) {
/* Normal transfer mode */
while (xlen != 0) {
if (ch->ti & BCM2708_DMA_S_IGNORE) {
/* Ignore reads */
data = 0;
} else {
data = ldl_le_phys(&s->dma_as, ch->source_ad);
}
if (ch->ti & BCM2708_DMA_S_INC) {
ch->source_ad += 4;
}
if (ch->ti & BCM2708_DMA_D_IGNORE) {
/* Ignore writes */
} else {
stl_le_phys(&s->dma_as, ch->dest_ad, data);
}
if (ch->ti & BCM2708_DMA_D_INC) {
ch->dest_ad += 4;
}
/* update remaining transfer length */
xlen -= 4;
if (ch->ti & BCM2708_DMA_TDMODE) {
ch->txfr_len = (ylen << 16) | xlen;
} else {
ch->txfr_len = xlen;
}
}
if (--ylen != 0) {
ch->source_ad += src_stride;
ch->dest_ad += dst_stride;
xlen = xlen_td;
}
}
ch->cs |= BCM2708_DMA_END;
if (ch->ti & BCM2708_DMA_INT_EN) {
ch->cs |= BCM2708_DMA_INT;
s->int_status |= (1 << c);
qemu_set_irq(ch->irq, 1);
}
/* Process next CB */
ch->conblk_ad = ch->nextconbk;
}
ch->cs &= ~BCM2708_DMA_ACTIVE;
ch->cs |= BCM2708_DMA_ISPAUSED;
}
static void bcm2835_dma_chan_reset(BCM2835DMAChan *ch)
{
ch->cs = 0;
ch->conblk_ad = 0;
}
static uint64_t bcm2835_dma_read(BCM2835DMAState *s, hwaddr offset,
unsigned size, unsigned c)
{
BCM2835DMAChan *ch;
uint32_t res = 0;
assert(size == 4);
assert(c < BCM2835_DMA_NCHANS);
ch = &s->chan[c];
switch (offset) {
case BCM2708_DMA_CS:
res = ch->cs;
break;
case BCM2708_DMA_ADDR:
res = ch->conblk_ad;
break;
case BCM2708_DMA_INFO:
res = ch->ti;
break;
case BCM2708_DMA_SOURCE_AD:
res = ch->source_ad;
break;
case BCM2708_DMA_DEST_AD:
res = ch->dest_ad;
break;
case BCM2708_DMA_TXFR_LEN:
res = ch->txfr_len;
break;
case BCM2708_DMA_STRIDE:
res = ch->stride;
break;
case BCM2708_DMA_NEXTCB:
res = ch->nextconbk;
break;
case BCM2708_DMA_DEBUG:
res = ch->debug;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"HWADDR_PRIx"\n",
__func__, offset);
break;
}
return res;
}
static void bcm2835_dma_write(BCM2835DMAState *s, hwaddr offset,
uint64_t value, unsigned size, unsigned c)
{
BCM2835DMAChan *ch;
uint32_t oldcs;
assert(size == 4);
assert(c < BCM2835_DMA_NCHANS);
ch = &s->chan[c];
switch (offset) {
case BCM2708_DMA_CS:
oldcs = ch->cs;
if (value & BCM2708_DMA_RESET) {
bcm2835_dma_chan_reset(ch);
}
if (value & BCM2708_DMA_ABORT) {
/* abort is a no-op, since we always run to completion */
}
if (value & BCM2708_DMA_END) {
ch->cs &= ~BCM2708_DMA_END;
}
if (value & BCM2708_DMA_INT) {
ch->cs &= ~BCM2708_DMA_INT;
s->int_status &= ~(1 << c);
qemu_set_irq(ch->irq, 0);
}
ch->cs &= ~BCM2708_DMA_CS_RW_MASK;
ch->cs |= (value & BCM2708_DMA_CS_RW_MASK);
if (!(oldcs & BCM2708_DMA_ACTIVE) && (ch->cs & BCM2708_DMA_ACTIVE)) {
bcm2835_dma_update(s, c);
}
break;
case BCM2708_DMA_ADDR:
ch->conblk_ad = value;
break;
case BCM2708_DMA_DEBUG:
ch->debug = value;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"HWADDR_PRIx"\n",
__func__, offset);
break;
}
}
static uint64_t bcm2835_dma0_read(void *opaque, hwaddr offset, unsigned size)
{
BCM2835DMAState *s = opaque;
if (offset < 0xf00) {
return bcm2835_dma_read(s, (offset & 0xff), size, (offset >> 8) & 0xf);
} else {
switch (offset) {
case BCM2708_DMA_INT_STATUS:
return s->int_status;
case BCM2708_DMA_ENABLE:
return s->enable;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"HWADDR_PRIx"\n",
__func__, offset);
return 0;
}
}
}
static uint64_t bcm2835_dma15_read(void *opaque, hwaddr offset, unsigned size)
{
return bcm2835_dma_read(opaque, (offset & 0xff), size, 15);
}
static void bcm2835_dma0_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
BCM2835DMAState *s = opaque;
if (offset < 0xf00) {
bcm2835_dma_write(s, (offset & 0xff), value, size, (offset >> 8) & 0xf);
} else {
switch (offset) {
case BCM2708_DMA_INT_STATUS:
break;
case BCM2708_DMA_ENABLE:
s->enable = (value & 0xffff);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%"HWADDR_PRIx"\n",
__func__, offset);
}
}
}
static void bcm2835_dma15_write(void *opaque, hwaddr offset, uint64_t value,
unsigned size)
{
bcm2835_dma_write(opaque, (offset & 0xff), value, size, 15);
}
static const MemoryRegionOps bcm2835_dma0_ops = {
.read = bcm2835_dma0_read,
.write = bcm2835_dma0_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
};
static const MemoryRegionOps bcm2835_dma15_ops = {
.read = bcm2835_dma15_read,
.write = bcm2835_dma15_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 4,
.valid.max_access_size = 4,
};
static const VMStateDescription vmstate_bcm2835_dma_chan = {
.name = TYPE_BCM2835_DMA "-chan",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(cs, BCM2835DMAChan),
VMSTATE_UINT32(conblk_ad, BCM2835DMAChan),
VMSTATE_UINT32(ti, BCM2835DMAChan),
VMSTATE_UINT32(source_ad, BCM2835DMAChan),
VMSTATE_UINT32(dest_ad, BCM2835DMAChan),
VMSTATE_UINT32(txfr_len, BCM2835DMAChan),
VMSTATE_UINT32(stride, BCM2835DMAChan),
VMSTATE_UINT32(nextconbk, BCM2835DMAChan),
VMSTATE_UINT32(debug, BCM2835DMAChan),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_bcm2835_dma = {
.name = TYPE_BCM2835_DMA,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_STRUCT_ARRAY(chan, BCM2835DMAState, BCM2835_DMA_NCHANS, 1,
vmstate_bcm2835_dma_chan, BCM2835DMAChan),
VMSTATE_UINT32(int_status, BCM2835DMAState),
VMSTATE_UINT32(enable, BCM2835DMAState),
VMSTATE_END_OF_LIST()
}
};
static void bcm2835_dma_init(Object *obj)
{
BCM2835DMAState *s = BCM2835_DMA(obj);
int n;
/* DMA channels 0-14 occupy a contiguous block of IO memory, along
* with the global enable and interrupt status bits. Channel 15
* has the same register map, but is mapped at a discontiguous
* address in a separate IO block.
*/
memory_region_init_io(&s->iomem0, OBJECT(s), &bcm2835_dma0_ops, s,
TYPE_BCM2835_DMA, 0x1000);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem0);
memory_region_init_io(&s->iomem15, OBJECT(s), &bcm2835_dma15_ops, s,
TYPE_BCM2835_DMA "-chan15", 0x100);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem15);
for (n = 0; n < 16; n++) {
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->chan[n].irq);
}
}
static void bcm2835_dma_reset(DeviceState *dev)
{
BCM2835DMAState *s = BCM2835_DMA(dev);
int n;
s->enable = 0xffff;
s->int_status = 0;
for (n = 0; n < BCM2835_DMA_NCHANS; n++) {
bcm2835_dma_chan_reset(&s->chan[n]);
}
}
static void bcm2835_dma_realize(DeviceState *dev, Error **errp)
{
BCM2835DMAState *s = BCM2835_DMA(dev);
Object *obj;
obj = object_property_get_link(OBJECT(dev), "dma-mr", &error_abort);
s->dma_mr = MEMORY_REGION(obj);
address_space_init(&s->dma_as, s->dma_mr, TYPE_BCM2835_DMA "-memory");
bcm2835_dma_reset(dev);
}
static void bcm2835_dma_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = bcm2835_dma_realize;
dc->reset = bcm2835_dma_reset;
dc->vmsd = &vmstate_bcm2835_dma;
}
static const TypeInfo bcm2835_dma_info = {
.name = TYPE_BCM2835_DMA,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(BCM2835DMAState),
.class_init = bcm2835_dma_class_init,
.instance_init = bcm2835_dma_init,
};
static void bcm2835_dma_register_types(void)
{
type_register_static(&bcm2835_dma_info);
}
type_init(bcm2835_dma_register_types)
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