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hw/sd/allwinner-sdhost: Use AddressSpace for DMA transfers

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Allow the device to execute the DMA transfers in a different
AddressSpace.

The A10 and H3 SoC keep using the system_memory address space,
but via the proper dma_memory_access() API.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Niek Linnenbank <nieklinnenbank@gmail.com>
Reviewed-by: Niek Linnenbank <nieklinnenbank@gmail.com>
Message-id: 20200814110057.307-1-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-08-28 10:02:45 +01:00 committed by Peter Maydell
parent 9a4670be7f
commit b3aec952bf
4 changed files with 41 additions and 6 deletions
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2
hw/arm/allwinner-a10.c
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@ -155,6 +155,8 @@ static void aw_a10_realize(DeviceState *dev, Error **errp)
}
/* SD/MMC */
object_property_set_link(OBJECT(&s->mmc0), "dma-memory",
OBJECT(get_system_memory()), &error_fatal);
sysbus_realize(SYS_BUS_DEVICE(&s->mmc0), &error_fatal);
sysbus_mmio_map(SYS_BUS_DEVICE(&s->mmc0), 0, AW_A10_MMC0_BASE);
sysbus_connect_irq(SYS_BUS_DEVICE(&s->mmc0), 0, qdev_get_gpio_in(dev, 32));

2
hw/arm/allwinner-h3.c
View File

@ -349,6 +349,8 @@ static void allwinner_h3_realize(DeviceState *dev, Error **errp)
sysbus_mmio_map(SYS_BUS_DEVICE(&s->sid), 0, s->memmap[AW_H3_SID]);
/* SD/MMC */
object_property_set_link(OBJECT(&s->mmc0), "dma-memory",
OBJECT(get_system_memory()), &error_fatal);
sysbus_realize(SYS_BUS_DEVICE(&s->mmc0), &error_fatal);
sysbus_mmio_map(SYS_BUS_DEVICE(&s->mmc0), 0, s->memmap[AW_H3_MMC0]);
sysbus_connect_irq(SYS_BUS_DEVICE(&s->mmc0), 0,

33
hw/sd/allwinner-sdhost.c
View File

@ -21,7 +21,10 @@
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/units.h"
#include "qapi/error.h"
#include "sysemu/blockdev.h"
#include "sysemu/dma.h"
#include "hw/qdev-properties.h"
#include "hw/irq.h"
#include "hw/sd/allwinner-sdhost.h"
#include "migration/vmstate.h"
@ -306,7 +309,7 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState *s,
uint8_t buf[1024];
/* Read descriptor */
cpu_physical_memory_read(desc_addr, desc, sizeof(*desc));
dma_memory_read(&s->dma_as, desc_addr, desc, sizeof(*desc));
if (desc->size == 0) {
desc->size = klass->max_desc_size;
} else if (desc->size > klass->max_desc_size) {
@ -331,14 +334,16 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState *s,
/* Write to SD bus */
if (is_write) {
cpu_physical_memory_read((desc->addr & DESC_SIZE_MASK) + num_done,
dma_memory_read(&s->dma_as,
(desc->addr & DESC_SIZE_MASK) + num_done,
buf, buf_bytes);
sdbus_write_data(&s->sdbus, buf, buf_bytes);
/* Read from SD bus */
} else {
sdbus_read_data(&s->sdbus, buf, buf_bytes);
cpu_physical_memory_write((desc->addr & DESC_SIZE_MASK) + num_done,
dma_memory_write(&s->dma_as,
(desc->addr & DESC_SIZE_MASK) + num_done,
buf, buf_bytes);
}
num_done += buf_bytes;
@ -346,7 +351,7 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState *s,
/* Clear hold flag and flush descriptor */
desc->status &= ~DESC_STATUS_HOLD;
cpu_physical_memory_write(desc_addr, desc, sizeof(*desc));
dma_memory_write(&s->dma_as, desc_addr, desc, sizeof(*desc));
return num_done;
}
@ -721,6 +726,12 @@ static const VMStateDescription vmstate_allwinner_sdhost = {
}
};
static Property allwinner_sdhost_properties[] = {
DEFINE_PROP_LINK("dma-memory", AwSdHostState, dma_mr,
TYPE_MEMORY_REGION, MemoryRegion *),
DEFINE_PROP_END_OF_LIST(),
};
static void allwinner_sdhost_init(Object *obj)
{
AwSdHostState *s = AW_SDHOST(obj);
@ -734,6 +745,18 @@ static void allwinner_sdhost_init(Object *obj)
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
}
static void allwinner_sdhost_realize(DeviceState *dev, Error **errp)
{
AwSdHostState *s = AW_SDHOST(dev);
if (!s->dma_mr) {
error_setg(errp, TYPE_AW_SDHOST " 'dma-memory' link not set");
return;
}
address_space_init(&s->dma_as, s->dma_mr, "sdhost-dma");
}
static void allwinner_sdhost_reset(DeviceState *dev)
{
AwSdHostState *s = AW_SDHOST(dev);
@ -792,6 +815,8 @@ static void allwinner_sdhost_class_init(ObjectClass *klass, void *data)
dc->reset = allwinner_sdhost_reset;
dc->vmsd = &vmstate_allwinner_sdhost;
dc->realize = allwinner_sdhost_realize;
device_class_set_props(dc, allwinner_sdhost_properties);
}
static void allwinner_sdhost_sun4i_class_init(ObjectClass *klass, void *data)

6
include/hw/sd/allwinner-sdhost.h
View File

@ -71,6 +71,12 @@ typedef struct AwSdHostState {
/** Interrupt output signal to notify CPU */
qemu_irq irq;
/** Memory region where DMA transfers are done */
MemoryRegion *dma_mr;
/** Address space used internally for DMA transfers */
AddressSpace dma_as;
/** Number of bytes left in current DMA transfer */
uint32_t transfer_cnt;