Spec v4.3 chapter 7.2.2 "Boot operation":
If the CMD line is held LOW for 74 clock cycles and more
after power-up before the first command is issued, the
slave recognizes that boot mode is being initiated and
starts preparing boot data internally.
Track uptime since last reset, add the sd_uptime_ns() helper.
When the first command is received, check at least 74 clocks
are elapsed (during the identification phase, at a 10kHz rate)
then enable BOOT_MODE in the Ext_CSD register.
Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org>
---
hw/sd/sd.c | 38 ++++++++++++++++++++++++++++++++++++++
hw/sd/trace-events | 1 +
2 files changed, 39 insertions(+)
diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index beb8e2730a..c7f8ea11c1 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -163,6 +163,8 @@ struct SDState {
*/
bool expecting_acmd;
uint32_t blk_written;
+ int64_t reset_time_ns;
+ uint32_t cmd_count;
uint64_t data_start;
uint32_t data_offset;
@@ -352,6 +354,11 @@ static uint8_t sd_crc7(const void *message, size_t width)
return shift_reg;
}
+static int64_t sd_uptime_ns(SDState *sd)
+{
+ return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - sd->reset_time_ns;
+}
+
/* Operation Conditions register */
#define OCR_POWER_DELAY_NS 500000 /* 0.5ms */
@@ -479,6 +486,10 @@ static void emmc_set_cid(SDState *sd)
#define CMULT_SHIFT 9 /* 512 times HWBLOCK_SIZE */
#define WPGROUP_SIZE (1 << (HWBLOCK_SHIFT + SECTOR_SHIFT + WPGROUP_SHIFT))
+#define OD_FREQ_MIN_HZ 10000
+#define OD_FREQ_MAX_HZ 400000
+#define BOOT_MODE_DELAY_CYCLES_MIN 74
+
static const uint8_t sd_csd_rw_mask[16] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfc, 0xfe,
@@ -798,6 +809,8 @@ static void sd_reset(DeviceState *dev)
sect = sd_addr_to_wpnum(size) + 1;
+ sd->reset_time_ns = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ sd->cmd_count = 0;
sd->state = sd_idle_state;
/* card registers */
@@ -906,6 +919,18 @@ static const VMStateDescription emmc_extcsd_vmstate = {
},
};
+static const VMStateDescription sdmmc_uptime_cmdcnt_vmstate = {
+ .name = "sd-card/uptime-command_count-state",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = vmstate_needed_for_emmc,
+ .fields = (const VMStateField[]) {
+ VMSTATE_INT64(reset_time_ns, SDState),
+ VMSTATE_UINT32(cmd_count, SDState),
+ VMSTATE_END_OF_LIST()
+ },
+};
+
static int sd_vmstate_pre_load(void *opaque)
{
SDState *sd = opaque;
@@ -954,6 +979,7 @@ static const VMStateDescription sd_vmstate = {
.subsections = (const VMStateDescription * const []) {
&sd_ocr_vmstate,
&emmc_extcsd_vmstate,
+ &sdmmc_uptime_cmdcnt_vmstate,
NULL
},
};
@@ -1980,6 +2006,16 @@ static sd_rsp_type_t sd_cmd_SEND_OP_COND(SDState *sd,
SDRequest req)
sd->state = sd_ready_state;
}
+ if (sd_is_emmc(sd) && sd->cmd_count == 1) {
+ int64_t clk_cycles = sd_uptime_ns(sd) / OD_FREQ_MIN_HZ;
+
+ trace_sdcard_ext_csd_bootmode(sd_uptime_ns(sd), clk_cycles,
+ clk_cycles > BOOT_MODE_DELAY_CYCLES_MIN);
+ if (clk_cycles > BOOT_MODE_DELAY_CYCLES_MIN) {
+ sd->ext_csd[EXT_CSD_PART_CONFIG] |= (1 << 3);
+ }
+ }
+
return sd_r3;
}
@@ -2162,6 +2198,8 @@ int sd_do_command(SDState *sd, SDRequest *req,
return 0;
}
+ ++sd->cmd_count;
+
if (sd->state == sd_inactive_state) {
rtype = sd_illegal;
goto send_response;
diff --git a/hw/sd/trace-events b/hw/sd/trace-events
index 43671dc791..5454e55077 100644
--- a/hw/sd/trace-events
+++ b/hw/sd/trace-events
@@ -57,6 +57,7 @@ sdcard_write_block(uint64_t addr, uint32_t len) "addr 0x%"
PRIx64 " size 0x%x"
sdcard_write_data(const char *proto, const char *cmd_desc, uint8_t cmd,
uint32_t offset, uint8_t value) "%s %20s/ CMD%02d ofs %"PRIu32" value 0x%02x"
sdcard_read_data(const char *proto, const char *cmd_desc, uint8_t cmd,
uint32_t offset, uint64_t size, uint32_t blklen) "%s %20s/ CMD%02d ofs
%"PRIu32" size %"PRIu64" blklen %" PRIu32
sdcard_set_voltage(uint16_t millivolts) "%u mV"
+sdcard_ext_csd_bootmode(int64_t uptime_ns, int64_t clk_cycles, unsigned
enabled) "%"PRId64" ns, %"PRId64" cycles, boot mode: %u"
sdcard_ext_csd_update(unsigned index, uint8_t oval, uint8_t nval) "index %u:
0x%02x -> 0x%02x"
sdcard_switch(unsigned access, unsigned index, unsigned value, unsigned set)
"SWITCH acc:%u idx:%u val:%u set:%u"
--
2.41.0
