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| author | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2020-10-25 20:17:47 +0100 |
|---|---|---|
| committer | Philippe Mathieu-Daudé <philmd@linaro.org> | 2024-06-24 15:08:40 +0200 |
| commit | 76ae9a231487a2b127c90bcb657fd42a1f6c06f8 (patch) | |
| tree | 9e423fde5d23b998c21423ddf44f729c951906e5 | |
| parent | cd44ccee18e2a8856f7ddc0b00bbc40dfa9fd5d5 (diff) | |
| download | qemu-76ae9a231487a2b127c90bcb657fd42a1f6c06f8.zip qemu-76ae9a231487a2b127c90bcb657fd42a1f6c06f8.tar.gz qemu-76ae9a231487a2b127c90bcb657fd42a1f6c06f8.tar.bz2 | |
hw/sd/sdcard: Add comments around registers and commands
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>
| -rw-r--r-- | hw/sd/sd.c | 20 |
1 files changed, 20 insertions, 0 deletions
@@ -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) { |