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hw/sd: Add sdbus_read_data() to read multiples bytes on the data line 

Add a sdbus_read_data() method to read multiple bytes on the
data line of a SD bus.
We might improve the tracing later, for now keep logging each
byte individually.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200814092346.21825-7-f4bug@amsat.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-08-14 11:23:45 +02:00
parent 62a21be60f
commit 6505a91a77
2 changed files with 24 additions and 0 deletions
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15
hw/sd/core.c
View File

@ -144,6 +144,21 @@ uint8_t sdbus_read_byte(SDBus *sdbus)
return value;
}
void sdbus_read_data(SDBus *sdbus, void *buf, size_t length)
{
SDState *card = get_card(sdbus);
uint8_t *data = buf;
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
for (size_t i = 0; i < length; i++) {
data[i] = sc->read_byte(card);
trace_sdbus_read(sdbus_name(sdbus), data[i]);
}
}
}
bool sdbus_data_ready(SDBus *sdbus)
{
SDState *card = get_card(sdbus);

9
include/hw/sd/sd.h
View File

@ -184,6 +184,15 @@ uint8_t sdbus_read_byte(SDBus *sd);
* Write multiple bytes of data on the data lines of a SD bus.
*/
void sdbus_write_data(SDBus *sdbus, const void *buf, size_t length);
/**
* Read data from a SD bus.
* @sdbus: bus
* @buf: buffer to read data into
* @length: number of bytes to read
*
* Read multiple bytes of data on the data lines of a SD bus.
*/
void sdbus_read_data(SDBus *sdbus, void *buf, size_t length);
bool sdbus_data_ready(SDBus *sd);
bool sdbus_get_inserted(SDBus *sd);
bool sdbus_get_readonly(SDBus *sd);