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hw/sd/sdcard: Add comments around registers and commands

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Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Tested-by: Cédric Le Goater <clg@redhat.com>
Message-Id: <20240621080554.18986-21-philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2020-10-25 20:17:47 +01:00 committed by Philippe Mathieu-Daudé
parent cd44ccee18
commit 76ae9a2314
1 changed files with 20 additions and 0 deletions
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20
hw/sd/sd.c
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@ -315,6 +315,8 @@ static uint8_t sd_crc7(const void *message, size_t width)
return shift_reg;
}
/* Operation Conditions register */
#define OCR_POWER_DELAY_NS 500000 /* 0.5ms */
FIELD(OCR, VDD_VOLTAGE_WINDOW, 0, 24)
@ -364,6 +366,8 @@ static void sd_set_ocr(SDState *sd)
}
}
/* SD Configuration register */
static void sd_set_scr(SDState *sd)
{
sd->scr[0] = 0 << 4; /* SCR structure version 1.0 */
@ -386,6 +390,8 @@ static void sd_set_scr(SDState *sd)
sd->scr[7] = 0x00;
}
/* Card IDentification register */
#define MID 0xaa
#define OID "XY"
#define PNM "QEMU!"
@ -411,6 +417,8 @@ static void sd_set_cid(SDState *sd)
sd->cid[15] = (sd_crc7(sd->cid, 15) << 1) | 1;
}
/* Card-Specific Data register */
#define HWBLOCK_SHIFT 9 /* 512 bytes */
#define SECTOR_SHIFT 5 /* 16 kilobytes */
#define WPGROUP_SHIFT 7 /* 2 megs */
@ -480,6 +488,8 @@ static void sd_set_csd(SDState *sd, uint64_t size)
sd->csd[15] = (sd_crc7(sd->csd, 15) << 1) | 1;
}
/* Relative Card Address register */
static void sd_set_rca(SDState *sd)
{
sd->rca += 0x4567;
@ -493,6 +503,8 @@ static uint16_t sd_req_get_rca(SDState *s, SDRequest req)
return 0;
}
/* Card Status register */
FIELD(CSR, AKE_SEQ_ERROR, 3, 1)
FIELD(CSR, APP_CMD, 5, 1)
FIELD(CSR, FX_EVENT, 6, 1)
@ -623,6 +635,8 @@ static void sd_reset(DeviceState *dev)
sect = sd_addr_to_wpnum(size) + 1;
sd->state = sd_idle_state;
/* card registers */
sd->rca = 0x0000;
sd->size = size;
sd_set_ocr(sd);
@ -1055,6 +1069,7 @@ static sd_rsp_type_t sd_cmd_unimplemented(SDState *sd, SDRequest req)
return sd_illegal;
}
/* CMD0 */
static sd_rsp_type_t sd_cmd_GO_IDLE_STATE(SDState *sd, SDRequest req)
{
if (sd->state != sd_inactive_state) {
@ -1065,6 +1080,7 @@ static sd_rsp_type_t sd_cmd_GO_IDLE_STATE(SDState *sd, SDRequest req)
return sd_is_spi(sd) ? sd_r1 : sd_r0;
}
/* CMD1 */
static sd_rsp_type_t spi_cmd_SEND_OP_COND(SDState *sd, SDRequest req)
{
sd->state = sd_transfer_state;
@ -1072,6 +1088,7 @@ static sd_rsp_type_t spi_cmd_SEND_OP_COND(SDState *sd, SDRequest req)
return sd_r1;
}
/* CMD2 */
static sd_rsp_type_t sd_cmd_ALL_SEND_CID(SDState *sd, SDRequest req)
{
switch (sd->state) {
@ -1083,6 +1100,7 @@ static sd_rsp_type_t sd_cmd_ALL_SEND_CID(SDState *sd, SDRequest req)
}
}
/* CMD3 */
static sd_rsp_type_t sd_cmd_SEND_RELATIVE_ADDR(SDState *sd, SDRequest req)
{
switch (sd->state) {
@ -1097,6 +1115,7 @@ static sd_rsp_type_t sd_cmd_SEND_RELATIVE_ADDR(SDState *sd, SDRequest req)
}
}
/* CMD19 */
static sd_rsp_type_t sd_cmd_SEND_TUNING_BLOCK(SDState *sd, SDRequest req)
{
if (sd->spec_version < SD_PHY_SPECv3_01_VERS) {
@ -1113,6 +1132,7 @@ static sd_rsp_type_t sd_cmd_SEND_TUNING_BLOCK(SDState *sd, SDRequest req)
return sd_r1;
}
/* CMD23 */
static sd_rsp_type_t sd_cmd_SET_BLOCK_COUNT(SDState *sd, SDRequest req)
{
if (sd->spec_version < SD_PHY_SPECv3_01_VERS) {