[PATCH v47 05/19] hw/sd/sdcard: Implement emmc_set_csd()

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

eMMC CSD register is very similar to SD one.
Most notable change: the version announced is v4.3.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
TODO: comment magic values?
---
 hw/sd/sd.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 2d737a836f..f580c6b2ae 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -476,6 +476,44 @@ static const uint8_t sd_csd_rw_mask[16] = {
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xfe,
 };
 
+static void emmc_set_csd(SDState *sd, uint64_t size)
+{
+    int hwblock_shift = HWBLOCK_SHIFT;
+    uint32_t sectsize = (1 << (SECTOR_SHIFT + 1)) - 1;
+    uint32_t wpsize = (1 << (WPGROUP_SHIFT + 1)) - 1;
+
+    sd->csd[0] = (2 << 6) | (4 << 2);
+    sd->csd[1] = 0x07;
+    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] = 0xfc |     /* Max. write current */
+        ((CMULT_SHIFT - 2) >> 1);
+    sd->csd[10] = 0x40 |    /* Erase sector size */
+        (((CMULT_SHIFT - 2) << 7) & 0x80) | (sectsize >> 1);
+    sd->csd[11] = 0x00 |    /* Write protect group size */
+        ((sectsize << 7) & 0x80) | wpsize;
+    sd->csd[12] = 0x90 |    /* Write speed factor */
+        (hwblock_shift >> 2);
+    sd->csd[13] = 0x20 |    /* Max. write data block length */
+        ((hwblock_shift << 6) & 0xc0);
+    sd->csd[14] = 0x00;
+    sd->csd[15] = (sd_crc7(sd->csd, 15) << 1) | 1;
+}
+
 static void sd_set_csd(SDState *sd, uint64_t size)
 {
     int hwblock_shift = HWBLOCK_SHIFT;
@@ -2600,6 +2638,7 @@ static void emmc_class_init(ObjectClass *klass, void *data)
     sc->proto = &sd_proto_emmc;
 
     sc->set_cid = emmc_set_cid;
+    sc->set_csd = emmc_set_csd;
 }
 
 static const TypeInfo sd_types[] = {
-- 
2.41.0