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mmc: core: Read the SD function extension registers for power management

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In the SD spec v4.0 the CMD48/49 and CMD58/59 were introduced as optional
commands. In the SD spec v4.1 the SD function extension registers were
introduced, which requires support for CMD48/49/58/59 to be read/written
from/to.

Moreover, a specific function extension register were added to let the card
announce support for optional features in regards to power management. The
features that were added are "Power Off Notification", "Power Down Mode"
and "Power Sustenance".

As a first step to support this, let's read and parse the register for
power management during the SD card initialization and store the
information about the supported features in the struct mmc_card. In this
way, we prepare for subsequent changes to implement the complete support
for the new features.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Acked-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20210504161222.101536-10-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson
2021-05-04 18:12:20 +02:00
parent dbea8ae9fe
commit c784f92769
3 changed files with 194 additions and 0 deletions
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13
include/linux/mmc/card.h
View File

@@ -191,6 +191,18 @@ struct sd_switch_caps {
#define SD_MAX_CURRENT_800 (1 << SD_SET_CURRENT_LIMIT_800)
};
struct sd_ext_reg {
u8 fno;
u8 page;
u16 offset;
u8 rev;
u8 feature_support;
/* Power Management Function. */
#define SD_EXT_POWER_OFF_NOTIFY (1<<0)
#define SD_EXT_POWER_SUSTENANCE (1<<1)
#define SD_EXT_POWER_DOWN_MODE (1<<2)
};
struct sdio_cccr {
unsigned int sdio_vsn;
unsigned int sd_vsn;
@@ -292,6 +304,7 @@ struct mmc_card {
struct sd_scr scr; /* extra SD information */
struct sd_ssr ssr; /* yet more SD information */
struct sd_switch_caps sw_caps; /* switch (CMD6) caps */
struct sd_ext_reg ext_power; /* SD extension reg for PM */
unsigned int sdio_funcs; /* number of SDIO functions */
atomic_t sdio_funcs_probed; /* number of probed SDIO funcs */

3
include/linux/mmc/sd.h
View File

@@ -29,6 +29,9 @@
#define SD_APP_OP_COND 41 /* bcr [31:0] OCR R3 */
#define SD_APP_SEND_SCR 51 /* adtc R1 */
/* class 11 */
#define SD_READ_EXTR_SINGLE 48 /* adtc [31:0] R1 */
/* OCR bit definitions */
#define SD_OCR_S18R (1 << 24) /* 1.8V switching request */
#define SD_ROCR_S18A SD_OCR_S18R /* 1.8V switching accepted by card */