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mmccam: Add support for 1.2V and 1.8V eMMC

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If the card reports that it support 1.2V or 1.8V signaling switch to this voltage.

Submitted by:	kibab
This commit is contained in:
Emmanuel Vadot 2020-07-22 19:08:05 +00:00
parent 2657d8e33e
commit fd7371f7e2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363428
1 changed files with 71 additions and 4 deletions
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75
sys/cam/mmc/mmc_da.c
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@ -136,6 +136,9 @@ struct sdda_softc {
/* Generic switch timeout */
uint32_t cmd6_time;
uint32_t timings; /* Mask of bus timings supported */
uint32_t vccq_120; /* Mask of bus timings at VCCQ of 1.2 V */
uint32_t vccq_180; /* Mask of bus timings at VCCQ of 1.8 V */
/* MMC partitions support */
struct sdda_part *part[MMC_PART_MAX];
uint8_t part_curr; /* Partition currently switched to */
@ -1242,6 +1245,7 @@ sdda_start_init(void *context, union ccb *start_ccb)
uint32_t sec_count;
int err;
int host_f_max;
uint8_t card_type;
CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("sdda_start_init\n"));
/* periph was held for us when this task was enqueued */
@ -1370,12 +1374,35 @@ sdda_start_init(void *context, union ccb *start_ccb)
}
if (mmcp->card_features & CARD_FEATURE_MMC && mmc_get_spec_vers(periph) >= 4) {
if (softc->raw_ext_csd[EXT_CSD_CARD_TYPE]
& EXT_CSD_CARD_TYPE_HS_52)
card_type = softc->raw_ext_csd[EXT_CSD_CARD_TYPE];
if (card_type & EXT_CSD_CARD_TYPE_HS_52)
softc->card_f_max = MMC_TYPE_HS_52_MAX;
else if (softc->raw_ext_csd[EXT_CSD_CARD_TYPE]
& EXT_CSD_CARD_TYPE_HS_26)
else if (card_type & EXT_CSD_CARD_TYPE_HS_26)
softc->card_f_max = MMC_TYPE_HS_26_MAX;
if ((card_type & EXT_CSD_CARD_TYPE_DDR_52_1_2V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_120) != 0) {
setbit(&softc->timings, bus_timing_mmc_ddr52);
setbit(&softc->vccq_120, bus_timing_mmc_ddr52);
CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("Card supports DDR52 at 1.2V\n"));
}
if ((card_type & EXT_CSD_CARD_TYPE_DDR_52_1_8V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_180) != 0) {
setbit(&softc->timings, bus_timing_mmc_ddr52);
setbit(&softc->vccq_180, bus_timing_mmc_ddr52);
CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("Card supports DDR52 at 1.8V\n"));
}
if ((card_type & EXT_CSD_CARD_TYPE_HS200_1_2V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_120) != 0) {
setbit(&softc->timings, bus_timing_mmc_hs200);
setbit(&softc->vccq_120, bus_timing_mmc_hs200);
CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("Card supports HS200 at 1.2V\n"));
}
if ((card_type & EXT_CSD_CARD_TYPE_HS200_1_8V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_180) != 0) {
setbit(&softc->timings, bus_timing_mmc_hs200);
setbit(&softc->vccq_180, bus_timing_mmc_hs200);
CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("Card supports HS200 at 1.8V\n"));
}
}
}
int f_max;
@ -1391,6 +1418,46 @@ sdda_start_init(void *context, union ccb *start_ccb)
f_max = 25000000;
}
}
/* If possible, set lower-level signaling */
enum mmc_bus_timing timing;
/* FIXME: MMCCAM supports max. bus_timing_mmc_ddr52 at the moment. */
for (timing = bus_timing_mmc_ddr52; timing > bus_timing_normal; timing--) {
if (isset(&softc->vccq_120, timing)) {
/* Set VCCQ = 1.2V */
start_ccb->ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
start_ccb->ccb_h.flags = CAM_DIR_NONE;
start_ccb->ccb_h.retry_count = 0;
start_ccb->ccb_h.timeout = 100;
start_ccb->ccb_h.cbfcnp = NULL;
cts->ios.vccq = vccq_120;
cts->ios_valid = MMC_VCCQ;
xpt_action(start_ccb);
break;
} else if (isset(&softc->vccq_180, timing)) {
/* Set VCCQ = 1.8V */
start_ccb->ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
start_ccb->ccb_h.flags = CAM_DIR_NONE;
start_ccb->ccb_h.retry_count = 0;
start_ccb->ccb_h.timeout = 100;
start_ccb->ccb_h.cbfcnp = NULL;
cts->ios.vccq = vccq_180;
cts->ios_valid = MMC_VCCQ;
xpt_action(start_ccb);
break;
} else {
/* Set VCCQ = 3.3V */
start_ccb->ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
start_ccb->ccb_h.flags = CAM_DIR_NONE;
start_ccb->ccb_h.retry_count = 0;
start_ccb->ccb_h.timeout = 100;
start_ccb->ccb_h.cbfcnp = NULL;
cts->ios.vccq = vccq_330;
cts->ios_valid = MMC_VCCQ;
xpt_action(start_ccb);
break;
}
}
/* Set frequency on the controller */
start_ccb->ccb_h.func_code = XPT_SET_TRAN_SETTINGS;
start_ccb->ccb_h.flags = CAM_DIR_NONE;