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esp: add 4 byte PDMA read and write transfers 

The MacOS toolbox ROM performs 4 byte reads/writes when transferring data to
and from the target. Since the SCSI bus is 16-bits wide, use the memory API
to split a 4 byte access into 2 x 2 byte accesses.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210304221103.6369-31-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-03-04 22:10:51 +00:00
parent 43d02df31b
commit cf1b828600
1 changed files with 4 additions and 2 deletions
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6
hw/scsi/esp.c
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@ -1002,7 +1002,9 @@ static const MemoryRegionOps sysbus_esp_pdma_ops = {
.write = sysbus_esp_pdma_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid.min_access_size = 1,
.valid.max_access_size = 2,
.valid.max_access_size = 4,
.impl.min_access_size = 1,
.impl.max_access_size = 2,
};
static const struct SCSIBusInfo esp_scsi_info = {
@ -1049,7 +1051,7 @@ static void sysbus_esp_realize(DeviceState *dev, Error **errp)
sysbus, "esp-regs", ESP_REGS << sysbus->it_shift);
sysbus_init_mmio(sbd, &sysbus->iomem);
memory_region_init_io(&sysbus->pdma, OBJECT(sysbus), &sysbus_esp_pdma_ops,
sysbus, "esp-pdma", 2);
sysbus, "esp-pdma", 4);
sysbus_init_mmio(sbd, &sysbus->pdma);
qdev_init_gpio_in(dev, sysbus_esp_gpio_demux, 2);