[PATCH v2 05/22] sd: emmc: Add support for EXT_CSD & CSD for eMMC

[Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>]

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: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
---
 hw/sd/sd.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 430bea5..4c211ba 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -135,6 +135,7 @@ struct SDState {
     uint64_t data_start;
     uint32_t data_offset;
     uint8_t data[512];
+    uint8_t ext_csd[512];
     qemu_irq readonly_cb;
     qemu_irq inserted_cb;
     QEMUTimer *ocr_power_timer;
@@ -389,6 +390,51 @@ 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[504] = 0x1; /* supported command sets */
+    sd->ext_csd[503] = 0x1; /* HPI features  */
+    sd->ext_csd[502] = 0x1; /* Background operations support */
+    sd->ext_csd[241] = 0xA; /* 1st initialization time after partitioning */
+    sd->ext_csd[232] = 0x1; /* Trim multiplier */
+    sd->ext_csd[231] = 0x15; /* Secure feature support */
+    sd->ext_csd[230] = 0x96; /* Secure erase support */
+    sd->ext_csd[229] = 0x96; /* Secure TRIM multiplier */
+    sd->ext_csd[228] = 0x7; /* Boot information */
+    sd->ext_csd[226] = 0x8; /* Boot partition size */
+    sd->ext_csd[225] = 0x6; /* Access size */
+    sd->ext_csd[224] = 0x4; /* HC Erase unit size */
+    sd->ext_csd[223] = 0x1; /* HC erase timeout */
+    sd->ext_csd[222] = 0x1; /* Reliable write sector count */
+    sd->ext_csd[221] = 0x4; /* HC write protect group size */
+    sd->ext_csd[220] = 0x8; /* Sleep current VCC  */
+    sd->ext_csd[219] = 0x7; /* Sleep current VCCQ */
+    sd->ext_csd[217] = 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[212] = (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[199] = 0x1; /* Partition switching timing */
+    sd->ext_csd[198] = 0x1; /* Out-of-interrupt busy timing */
+    sd->ext_csd[196] = 0xFF; /* Card type */
+    sd->ext_csd[194] = 0x2; /* CSD Structure version */
+    sd->ext_csd[192] = 0x5; /* Extended CSD revision */
+    sd->ext_csd[168] = 0x1; /* RPMB size */
+    sd->ext_csd[160] = 0x3; /* Partinioning support */
+    sd->ext_csd[159] = 0x00; /* Max enhanced area size */
+    sd->ext_csd[158] = 0x00; /* ... */
+    sd->ext_csd[157] = 0xEC; /* ... */
+}
+
 static void sd_set_csd(SDState *sd, uint64_t size)
 {
     int hwblock_shift = HWBLOCK_SHIFT;
@@ -402,8 +448,11 @@ static void sd_set_csd(SDState *sd, uint64_t size)
     }
     csize = (size >> (CMULT_SHIFT + hwblock_shift)) - 1;
 
-    if (size <= SDSC_MAX_CAPACITY) { /* Standard Capacity SD */
-        sd->csd[0] = 0x00;  /* CSD structure */
+    if (size <= SDSC_MAX_CAPACITY || sd->emmc) { /* Standard Capacity SD */
+        if (sd->emmc && size >= SDSC_MAX_CAPACITY) {
+            csize = 0xfff;
+        }
+        sd->csd[0] = sd->emmc ? 0xd0 : 0x00;  /* CSD structure */
         sd->csd[1] = 0x26;  /* Data read access-time-1 */
         sd->csd[2] = 0x00;  /* Data read access-time-2 */
         sd->csd[3] = 0x32;      /* Max. data transfer rate: 25 MHz */
@@ -447,6 +496,10 @@ static void sd_set_csd(SDState *sd, uint64_t size)
         sd->csd[14] = 0x00;
     }
     sd->csd[15] = (sd_crc7(sd->csd, 15) << 1) | 1;
+
+    if (sd->emmc) {
+        mmc_set_ext_csd(sd, size);
+    }
 }
 
 static void sd_set_rca(SDState *sd, uint16_t value)
-- 
2.7.4