[RFC PATCH 14/19] hw/sd/sdcard: Add emmc_cmd_SEND_EXT_CSD handler (CMD8)

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

From: Vincent Palatin <vpalatin@chromium.org>

The parameters mimick a real 4GB eMMC, but it can be set to various
sizes. Initially from Vincent Palatin <vpalatin@chromium.org>

eMMC CSD is similar to SD with an option to refer EXT_CSD for larger
devices.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
TODO simplify params, see:
https://lore.kernel.org/qemu-devel/54bc25fd-acea-44a3-b696-c261e7e9706d@kaod.org/
---
 hw/sd/sd.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 82e0b5838f..0561079eff 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -122,6 +122,7 @@ struct SDState {
     uint16_t rca;
     uint32_t card_status;
     uint8_t sd_status[64];
+    uint8_t ext_csd[512];
 
     /* Static properties */
 
@@ -460,6 +461,82 @@ static const uint8_t sd_csd_rw_mask[16] = {
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xfe,
 };
 
+static void mmc_set_ext_csd(SDState *sd, uint64_t size)
+{
+    uint32_t sectcount = size >> HWBLOCK_SHIFT;
+
+    memset(sd->ext_csd, 0, sizeof(sd->ext_csd));
+
+    sd->ext_csd[EXT_CSD_S_CMD_SET] = 0x1; /* supported command sets */
+    sd->ext_csd[EXT_CSD_HPI_FEATURES] = 0x3; /* HPI features  */
+    sd->ext_csd[EXT_CSD_BKOPS_SUPPORT] = 0x1; /* Background operations */
+    sd->ext_csd[241] = 0xA; /* 1st initialization time after partitioning */
+    sd->ext_csd[EXT_CSD_TRIM_MULT] = 0x1; /* Trim multiplier */
+    sd->ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT] = 0x15; /* Secure feature */
+    sd->ext_csd[EXT_CSD_SEC_ERASE_MULT] = 0x96; /* Secure erase support */
+    sd->ext_csd[EXT_CSD_SEC_TRIM_MULT] = 0x96; /* Secure TRIM multiplier */
+    sd->ext_csd[EXT_CSD_BOOT_INFO] = 0x7; /* Boot information */
+    sd->ext_csd[EXT_CSD_BOOT_MULT] = 0x8; /* Boot partition size. 128KB unit */
+    sd->ext_csd[EXT_CSD_ACC_SIZE] = 0x6; /* Access size */
+    sd->ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE] = 0x4; /* HC Erase unit size */
+    sd->ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT] = 0x1; /* HC erase timeout */
+    sd->ext_csd[EXT_CSD_REL_WR_SEC_C] = 0x1; /* Reliable write sector count */
+    sd->ext_csd[EXT_CSD_HC_WP_GRP_SIZE] = 0x4; /* HC write protect group size */
+    sd->ext_csd[EXT_CSD_S_C_VCC] = 0x8; /* Sleep current VCC  */
+    sd->ext_csd[EXT_CSD_S_C_VCCQ] = 0x7; /* Sleep current VCCQ */
+    sd->ext_csd[EXT_CSD_S_A_TIMEOUT] = 0x11; /* Sleep/Awake timeout */
+    sd->ext_csd[215] = (sectcount >> 24) & 0xff; /* Sector count */
+    sd->ext_csd[214] = (sectcount >> 16) & 0xff; /* ... */
+    sd->ext_csd[213] = (sectcount >> 8) & 0xff;  /* ... */
+    sd->ext_csd[EXT_CSD_SEC_CNT] = (sectcount & 0xff);       /* ... */
+    sd->ext_csd[210] = 0xa; /* Min write perf for 8bit@52Mhz */
+    sd->ext_csd[209] = 0xa; /* Min read perf for 8bit@52Mhz  */
+    sd->ext_csd[208] = 0xa; /* Min write perf for 4bit@52Mhz */
+    sd->ext_csd[207] = 0xa; /* Min read perf for 4bit@52Mhz */
+    sd->ext_csd[206] = 0xa; /* Min write perf for 4bit@26Mhz */
+    sd->ext_csd[205] = 0xa; /* Min read perf for 4bit@26Mhz */
+    sd->ext_csd[EXT_CSD_PART_SWITCH_TIME] = 0x1;
+    sd->ext_csd[EXT_CSD_OUT_OF_INTERRUPT_TIME] = 0x1;
+    sd->ext_csd[EXT_CSD_CARD_TYPE] = 0x7;
+    sd->ext_csd[EXT_CSD_STRUCTURE] = 0x2;
+    sd->ext_csd[EXT_CSD_REV] = 0x5;
+    sd->ext_csd[EXT_CSD_RPMB_MULT] = 0x1; /* RPMB size */
+    sd->ext_csd[EXT_CSD_PARTITION_SUPPORT] = 0x3;
+    sd->ext_csd[159] = 0x00; /* Max enhanced area size */
+    sd->ext_csd[158] = 0x00; /* ... */
+    sd->ext_csd[157] = 0xEC; /* ... */
+}
+
+static void sd_emmc_set_csd(SDState *sd, uint64_t size)
+{
+    sd->csd[0] = 0xd0;
+    sd->csd[1] = 0x0f;
+    sd->csd[2] = 0x00;
+    sd->csd[3] = 0x32;
+    sd->csd[4] = 0x0f;
+    if (size <= 2 * GiB) {
+        /* use 1k blocks */
+        uint32_t csize1k = (size >> (CMULT_SHIFT + 10)) - 1;
+        sd->csd[5] = 0x5a;
+        sd->csd[6] = 0x80 | ((csize1k >> 10) & 0xf);
+        sd->csd[7] = (csize1k >> 2) & 0xff;
+    } else { /* >= 2GB : size stored in ext CSD, block addressing */
+        sd->csd[5] = 0x59;
+        sd->csd[6] = 0x8f;
+        sd->csd[7] = 0xff;
+        sd->ocr = FIELD_DP32(sd->ocr, OCR, CARD_CAPACITY, 1);
+    }
+    sd->csd[8] = 0xff;
+    sd->csd[9] = 0xff;
+    sd->csd[10] = 0xf7;
+    sd->csd[11] = 0xfe;
+    sd->csd[12] = 0x49;
+    sd->csd[13] = 0x10;
+    sd->csd[14] = 0x00;
+    sd->csd[15] = (sd_crc7(sd->csd, 15) << 1) | 1;
+    mmc_set_ext_csd(sd, size);
+}
+
 static void sd_set_csd(SDState *sd, uint64_t size)
 {
     int hwblock_shift = HWBLOCK_SHIFT;
@@ -1364,6 +1441,17 @@ static sd_rsp_type_t sd_cmd_SEND_IF_COND(SDState *sd, SDRequest req)
     return sd_r7;
 }
 
+/* CMD8 */
+static sd_rsp_type_t emmc_cmd_SEND_EXT_CSD(SDState *sd, SDRequest req)
+{
+    if (sd->state != sd_transfer_state) {
+        return sd_invalid_state_for_cmd(sd, req);
+    }
+
+    return sd_cmd_to_sendingdata(sd, req, sd_req_get_address(sd, req),
+                                 sd->ext_csd, sizeof(sd->ext_csd));
+}
+
 /* CMD9 */
 static sd_rsp_type_t spi_cmd_SEND_CSD(SDState *sd, SDRequest req)
 {
@@ -2297,6 +2385,7 @@ uint8_t sd_read_byte(SDState *sd)
                            sd->data_offset, sd->data_size, io_len);
     switch (sd->current_cmd) {
     case 6:  /* CMD6:   SWITCH_FUNCTION */
+    case 8:  /* CMD8:   SEND_EXT_CSD */
     case 9:  /* CMD9:   SEND_CSD */
     case 10: /* CMD10:  SEND_CID */
     case 13: /* ACMD13: SD_STATUS */
@@ -2474,6 +2563,7 @@ static const SDProto sd_proto_emmc = {
         [4]  = {0,  sd_bc,   "SEND_DSR", sd_cmd_unimplemented},
         [5]  = {0,  sd_ac,   "SLEEP/AWAKE", emmc_cmd_sleep_awake},
         [7]  = {0,  sd_ac,   "(DE)SELECT_CARD", sd_cmd_DE_SELECT_CARD},
+        [8]  = {0,  sd_adtc, "SEND_EXT_CSD", emmc_cmd_SEND_EXT_CSD},
         [9]  = {0,  sd_ac,   "SEND_CSD", sd_cmd_SEND_CSD},
         [10] = {0,  sd_ac,   "SEND_CID", sd_cmd_SEND_CID},
         [12] = {0,  sd_ac,   "STOP_TRANSMISSION", sd_cmd_STOP_TRANSMISSION},
@@ -2649,6 +2739,7 @@ static void emmc_class_init(ObjectClass *klass, void *data)
     dc->desc = "eMMC";
     dc->realize = emmc_realize;
     sc->proto = &sd_proto_emmc;
+    sc->set_csd = sd_emmc_set_csd;
 }
 
 static const TypeInfo sd_types[] = {
-- 
2.41.0