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hw/sd/sdhci: Add dummy Samsung SDHCI controller

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The Linux kernel access few S3C-specific registers [1] to set some
clock. We don't care about this part for device emulation [2]. Add
a dummy device to properly ignore these accesses, so we can focus
on the important registers missing.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/mmc/host/sdhci-s3c-regs.h?h=cc014f3
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/mmc/host/sdhci-s3c.c?h=v5.3#n263

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Message-id: 20191005154748.21718-4-f4bug@amsat.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2019-10-22 16:50:37 +01:00 committed by Peter Maydell
parent efadc8182d
commit c85fba508b
2 changed files with 67 additions and 0 deletions
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65
hw/sd/sdhci.c
View File

@ -1761,11 +1761,76 @@ static const TypeInfo imx_usdhc_info = {
.instance_init = imx_usdhc_init,
};
/* --- qdev Samsung s3c --- */
#define S3C_SDHCI_CONTROL2 0x80
#define S3C_SDHCI_CONTROL3 0x84
#define S3C_SDHCI_CONTROL4 0x8c
static uint64_t sdhci_s3c_read(void *opaque, hwaddr offset, unsigned size)
{
uint64_t ret;
switch (offset) {
case S3C_SDHCI_CONTROL2:
case S3C_SDHCI_CONTROL3:
case S3C_SDHCI_CONTROL4:
/* ignore */
ret = 0;
break;
default:
ret = sdhci_read(opaque, offset, size);
break;
}
return ret;
}
static void sdhci_s3c_write(void *opaque, hwaddr offset, uint64_t val,
unsigned size)
{
switch (offset) {
case S3C_SDHCI_CONTROL2:
case S3C_SDHCI_CONTROL3:
case S3C_SDHCI_CONTROL4:
/* ignore */
break;
default:
sdhci_write(opaque, offset, val, size);
break;
}
}
static const MemoryRegionOps sdhci_s3c_mmio_ops = {
.read = sdhci_s3c_read,
.write = sdhci_s3c_write,
.valid = {
.min_access_size = 1,
.max_access_size = 4,
.unaligned = false
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void sdhci_s3c_init(Object *obj)
{
SDHCIState *s = SYSBUS_SDHCI(obj);
s->io_ops = &sdhci_s3c_mmio_ops;
}
static const TypeInfo sdhci_s3c_info = {
.name = TYPE_S3C_SDHCI ,
.parent = TYPE_SYSBUS_SDHCI,
.instance_init = sdhci_s3c_init,
};
static void sdhci_register_types(void)
{
type_register_static(&sdhci_sysbus_info);
type_register_static(&sdhci_bus_info);
type_register_static(&imx_usdhc_info);
type_register_static(&sdhci_s3c_info);
}
type_init(sdhci_register_types)

2
include/hw/sd/sdhci.h
View File

@ -116,4 +116,6 @@ typedef struct SDHCIState {
#define TYPE_IMX_USDHC "imx-usdhc"
#define TYPE_S3C_SDHCI "s3c-sdhci"
#endif /* SDHCI_H */