summaryrefslogtreecommitdiff
path: root/drivers/mmc/core/mmc.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c745
1 files changed, 494 insertions, 251 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 4ffea14b7eb6..7c86efb1044a 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1,20 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/drivers/mmc/core/mmc.c
*
* Copyright (C) 2003-2004 Russell King, All Rights Reserved.
* Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
* MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/stat.h>
+#include <linux/string.h>
#include <linux/pm_runtime.h>
+#include <linux/random.h>
+#include <linux/sysfs.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
@@ -30,6 +30,15 @@
#include "pwrseq.h"
#define DEFAULT_CMD6_TIMEOUT_MS 500
+#define MIN_CACHE_EN_TIMEOUT_MS 1600
+#define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */
+
+enum mmc_poweroff_type {
+ MMC_POWEROFF_SUSPEND,
+ MMC_POWEROFF_SHUTDOWN,
+ MMC_POWEROFF_UNDERVOLTAGE,
+ MMC_POWEROFF_UNBIND,
+};
static const unsigned int tran_exp[] = {
10000, 100000, 1000000, 10000000,
@@ -41,29 +50,15 @@ static const unsigned char tran_mant[] = {
35, 40, 45, 50, 55, 60, 70, 80,
};
-static const unsigned int tacc_exp[] = {
+static const unsigned int taac_exp[] = {
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000,
};
-static const unsigned int tacc_mant[] = {
+static const unsigned int taac_mant[] = {
0, 10, 12, 13, 15, 20, 25, 30,
35, 40, 45, 50, 55, 60, 70, 80,
};
-#define UNSTUFF_BITS(resp,start,size) \
- ({ \
- const int __size = size; \
- const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
- const int __off = 3 - ((start) / 32); \
- const int __shft = (start) & 31; \
- u32 __res; \
- \
- __res = resp[__off] >> __shft; \
- if (__size + __shft > 32) \
- __res |= resp[__off-1] << ((32 - __shft) % 32); \
- __res & __mask; \
- })
-
/*
* Given the decoded CSD structure, decode the raw CID to our CID structure.
*/
@@ -72,42 +67,48 @@ static int mmc_decode_cid(struct mmc_card *card)
u32 *resp = card->raw_cid;
/*
+ * Add the raw card ID (cid) data to the entropy pool. It doesn't
+ * matter that not all of it is unique, it's just bonus entropy.
+ */
+ add_device_randomness(&card->raw_cid, sizeof(card->raw_cid));
+
+ /*
* The selection of the format here is based upon published
- * specs from sandisk and from what people have reported.
+ * specs from SanDisk and from what people have reported.
*/
switch (card->csd.mmca_vsn) {
case 0: /* MMC v1.0 - v1.2 */
case 1: /* MMC v1.4 */
- card->cid.manfid = UNSTUFF_BITS(resp, 104, 24);
- card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
- card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
- card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
- card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
- card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
- card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
- card->cid.prod_name[6] = UNSTUFF_BITS(resp, 48, 8);
- card->cid.hwrev = UNSTUFF_BITS(resp, 44, 4);
- card->cid.fwrev = UNSTUFF_BITS(resp, 40, 4);
- card->cid.serial = UNSTUFF_BITS(resp, 16, 24);
- card->cid.month = UNSTUFF_BITS(resp, 12, 4);
- card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
+ card->cid.manfid = unstuff_bits(resp, 104, 24);
+ card->cid.prod_name[0] = unstuff_bits(resp, 96, 8);
+ card->cid.prod_name[1] = unstuff_bits(resp, 88, 8);
+ card->cid.prod_name[2] = unstuff_bits(resp, 80, 8);
+ card->cid.prod_name[3] = unstuff_bits(resp, 72, 8);
+ card->cid.prod_name[4] = unstuff_bits(resp, 64, 8);
+ card->cid.prod_name[5] = unstuff_bits(resp, 56, 8);
+ card->cid.prod_name[6] = unstuff_bits(resp, 48, 8);
+ card->cid.hwrev = unstuff_bits(resp, 44, 4);
+ card->cid.fwrev = unstuff_bits(resp, 40, 4);
+ card->cid.serial = unstuff_bits(resp, 16, 24);
+ card->cid.month = unstuff_bits(resp, 12, 4);
+ card->cid.year = unstuff_bits(resp, 8, 4) + 1997;
break;
case 2: /* MMC v2.0 - v2.2 */
case 3: /* MMC v3.1 - v3.3 */
case 4: /* MMC v4 */
- card->cid.manfid = UNSTUFF_BITS(resp, 120, 8);
- card->cid.oemid = UNSTUFF_BITS(resp, 104, 16);
- card->cid.prod_name[0] = UNSTUFF_BITS(resp, 96, 8);
- card->cid.prod_name[1] = UNSTUFF_BITS(resp, 88, 8);
- card->cid.prod_name[2] = UNSTUFF_BITS(resp, 80, 8);
- card->cid.prod_name[3] = UNSTUFF_BITS(resp, 72, 8);
- card->cid.prod_name[4] = UNSTUFF_BITS(resp, 64, 8);
- card->cid.prod_name[5] = UNSTUFF_BITS(resp, 56, 8);
- card->cid.prv = UNSTUFF_BITS(resp, 48, 8);
- card->cid.serial = UNSTUFF_BITS(resp, 16, 32);
- card->cid.month = UNSTUFF_BITS(resp, 12, 4);
- card->cid.year = UNSTUFF_BITS(resp, 8, 4) + 1997;
+ card->cid.manfid = unstuff_bits(resp, 120, 8);
+ card->cid.oemid = unstuff_bits(resp, 104, 16);
+ card->cid.prod_name[0] = unstuff_bits(resp, 96, 8);
+ card->cid.prod_name[1] = unstuff_bits(resp, 88, 8);
+ card->cid.prod_name[2] = unstuff_bits(resp, 80, 8);
+ card->cid.prod_name[3] = unstuff_bits(resp, 72, 8);
+ card->cid.prod_name[4] = unstuff_bits(resp, 64, 8);
+ card->cid.prod_name[5] = unstuff_bits(resp, 56, 8);
+ card->cid.prv = unstuff_bits(resp, 48, 8);
+ card->cid.serial = unstuff_bits(resp, 16, 32);
+ card->cid.month = unstuff_bits(resp, 12, 4);
+ card->cid.year = unstuff_bits(resp, 8, 4) + 1997;
break;
default:
@@ -116,6 +117,9 @@ static int mmc_decode_cid(struct mmc_card *card)
return -EINVAL;
}
+ /* some product names include trailing whitespace */
+ strim(card->cid.prod_name);
+
return 0;
}
@@ -129,6 +133,17 @@ static void mmc_set_erase_size(struct mmc_card *card)
mmc_init_erase(card);
}
+
+static void mmc_set_wp_grp_size(struct mmc_card *card)
+{
+ if (card->ext_csd.erase_group_def & 1)
+ card->wp_grp_size = card->ext_csd.hc_erase_size *
+ card->ext_csd.raw_hc_erase_gap_size;
+ else
+ card->wp_grp_size = card->csd.erase_size *
+ (card->csd.wp_grp_size + 1);
+}
+
/*
* Given a 128-bit response, decode to our card CSD structure.
*/
@@ -143,42 +158,43 @@ static int mmc_decode_csd(struct mmc_card *card)
* v1.2 has extra information in bits 15, 11 and 10.
* We also support eMMC v4.4 & v4.41.
*/
- csd->structure = UNSTUFF_BITS(resp, 126, 2);
+ csd->structure = unstuff_bits(resp, 126, 2);
if (csd->structure == 0) {
pr_err("%s: unrecognised CSD structure version %d\n",
mmc_hostname(card->host), csd->structure);
return -EINVAL;
}
- csd->mmca_vsn = UNSTUFF_BITS(resp, 122, 4);
- m = UNSTUFF_BITS(resp, 115, 4);
- e = UNSTUFF_BITS(resp, 112, 3);
- csd->tacc_ns = (tacc_exp[e] * tacc_mant[m] + 9) / 10;
- csd->tacc_clks = UNSTUFF_BITS(resp, 104, 8) * 100;
+ csd->mmca_vsn = unstuff_bits(resp, 122, 4);
+ m = unstuff_bits(resp, 115, 4);
+ e = unstuff_bits(resp, 112, 3);
+ csd->taac_ns = (taac_exp[e] * taac_mant[m] + 9) / 10;
+ csd->taac_clks = unstuff_bits(resp, 104, 8) * 100;
- m = UNSTUFF_BITS(resp, 99, 4);
- e = UNSTUFF_BITS(resp, 96, 3);
+ m = unstuff_bits(resp, 99, 4);
+ e = unstuff_bits(resp, 96, 3);
csd->max_dtr = tran_exp[e] * tran_mant[m];
- csd->cmdclass = UNSTUFF_BITS(resp, 84, 12);
+ csd->cmdclass = unstuff_bits(resp, 84, 12);
- e = UNSTUFF_BITS(resp, 47, 3);
- m = UNSTUFF_BITS(resp, 62, 12);
+ e = unstuff_bits(resp, 47, 3);
+ m = unstuff_bits(resp, 62, 12);
csd->capacity = (1 + m) << (e + 2);
- csd->read_blkbits = UNSTUFF_BITS(resp, 80, 4);
- csd->read_partial = UNSTUFF_BITS(resp, 79, 1);
- csd->write_misalign = UNSTUFF_BITS(resp, 78, 1);
- csd->read_misalign = UNSTUFF_BITS(resp, 77, 1);
- csd->dsr_imp = UNSTUFF_BITS(resp, 76, 1);
- csd->r2w_factor = UNSTUFF_BITS(resp, 26, 3);
- csd->write_blkbits = UNSTUFF_BITS(resp, 22, 4);
- csd->write_partial = UNSTUFF_BITS(resp, 21, 1);
+ csd->read_blkbits = unstuff_bits(resp, 80, 4);
+ csd->read_partial = unstuff_bits(resp, 79, 1);
+ csd->write_misalign = unstuff_bits(resp, 78, 1);
+ csd->read_misalign = unstuff_bits(resp, 77, 1);
+ csd->dsr_imp = unstuff_bits(resp, 76, 1);
+ csd->r2w_factor = unstuff_bits(resp, 26, 3);
+ csd->write_blkbits = unstuff_bits(resp, 22, 4);
+ csd->write_partial = unstuff_bits(resp, 21, 1);
if (csd->write_blkbits >= 9) {
- a = UNSTUFF_BITS(resp, 42, 5);
- b = UNSTUFF_BITS(resp, 37, 5);
+ a = unstuff_bits(resp, 42, 5);
+ b = unstuff_bits(resp, 37, 5);
csd->erase_size = (a + 1) * (b + 1);
csd->erase_size <<= csd->write_blkbits - 9;
+ csd->wp_grp_size = unstuff_bits(resp, 32, 5);
}
return 0;
@@ -299,7 +315,7 @@ static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
}
}
-static void mmc_part_add(struct mmc_card *card, unsigned int size,
+static void mmc_part_add(struct mmc_card *card, u64 size,
unsigned int part_cfg, char *name, int idx, bool ro,
int area_type)
{
@@ -315,7 +331,7 @@ static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
{
int idx;
u8 hc_erase_grp_sz, hc_wp_grp_sz;
- unsigned int part_size;
+ u64 part_size;
/*
* General purpose partition feature support --
@@ -345,8 +361,7 @@ static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
(ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3 + 1]
<< 8) +
ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
- part_size *= (size_t)(hc_erase_grp_sz *
- hc_wp_grp_sz);
+ part_size *= (hc_erase_grp_sz * hc_wp_grp_sz);
mmc_part_add(card, part_size << 19,
EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
"gp%d", idx, false,
@@ -364,7 +379,7 @@ static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
{
int err = 0, idx;
- unsigned int part_size;
+ u64 part_size;
struct device_node *np;
bool broken_hpi = false;
@@ -413,23 +428,20 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.strobe_support = ext_csd[EXT_CSD_STROBE_SUPPORT];
card->ext_csd.raw_card_type = ext_csd[EXT_CSD_CARD_TYPE];
- mmc_select_card_type(card);
card->ext_csd.raw_s_a_timeout = ext_csd[EXT_CSD_S_A_TIMEOUT];
card->ext_csd.raw_erase_timeout_mult =
ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
card->ext_csd.raw_hc_erase_grp_size =
ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
+ card->ext_csd.raw_boot_mult =
+ ext_csd[EXT_CSD_BOOT_MULT];
if (card->ext_csd.rev >= 3) {
u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];
card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];
/* EXT_CSD value is in units of 10ms, but we store in ms */
card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
- /* Some eMMC set the value too low so set a minimum */
- if (card->ext_csd.part_time &&
- card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
- card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
/* Sleep / awake timeout in 100ns units */
if (sa_shift > 0 && sa_shift <= 0x17)
@@ -448,7 +460,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
* There are two boot regions of equal size, defined in
* multiples of 128K.
*/
- if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_boot_partition_access(card->host)) {
+ if (ext_csd[EXT_CSD_BOOT_MULT] && mmc_host_can_access_boot(card->host)) {
for (idx = 0; idx < MMC_NUM_BOOT_PARTITION; idx++) {
part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
mmc_part_add(card, part_size,
@@ -526,8 +538,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->cid.year += 16;
/* check whether the eMMC card supports BKOPS */
- if (!mmc_card_broken_hpi(card) &&
- ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
+ if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
card->ext_csd.bkops = 1;
card->ext_csd.man_bkops_en =
(ext_csd[EXT_CSD_BKOPS_EN] &
@@ -568,7 +579,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
* RPMB regions are defined in multiples of 128K.
*/
card->ext_csd.raw_rpmb_size_mult = ext_csd[EXT_CSD_RPMB_MULT];
- if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_cmd23(card->host)) {
+ if (ext_csd[EXT_CSD_RPMB_MULT] && mmc_host_can_cmd23(card->host)) {
mmc_part_add(card, ext_csd[EXT_CSD_RPMB_MULT] << 17,
EXT_CSD_PART_CONFIG_ACC_RPMB,
"rpmb", 0, false,
@@ -611,15 +622,21 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
} else {
card->ext_csd.data_tag_unit_size = 0;
}
-
- card->ext_csd.max_packed_writes =
- ext_csd[EXT_CSD_MAX_PACKED_WRITES];
- card->ext_csd.max_packed_reads =
- ext_csd[EXT_CSD_MAX_PACKED_READS];
} else {
card->ext_csd.data_sector_size = 512;
}
+ /*
+ * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
+ * when accessing a specific field", so use it here if there is no
+ * PARTITION_SWITCH_TIME.
+ */
+ if (!card->ext_csd.part_time)
+ card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
+ /* Some eMMC set the value too low so set a minimum */
+ if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
+ card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
+
/* eMMC v5 or later */
if (card->ext_csd.rev >= 7) {
memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
@@ -651,6 +668,9 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
mmc_hostname(card->host),
card->ext_csd.cmdq_depth);
}
+ card->ext_csd.enhanced_rpmb_supported =
+ (card->ext_csd.rel_param &
+ EXT_CSD_WR_REL_PARAM_EN_RPMB_REL_WR);
}
out:
return err;
@@ -661,7 +681,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
u8 *ext_csd;
int err;
- if (!mmc_can_ext_csd(card))
+ if (!mmc_card_can_ext_csd(card))
return 0;
err = mmc_get_ext_csd(card, &ext_csd);
@@ -774,13 +794,15 @@ MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
+MMC_DEV_ATTR(wp_grp_size, "%u\n", card->wp_grp_size << 9);
MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
-MMC_DEV_ATTR(pre_eol_info, "%02x\n", card->ext_csd.pre_eol_info);
+MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
+MMC_DEV_ATTR(pre_eol_info, "0x%02x\n", card->ext_csd.pre_eol_info);
MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
card->ext_csd.device_life_time_est_typ_a,
card->ext_csd.device_life_time_est_typ_b);
@@ -789,8 +811,11 @@ MMC_DEV_ATTR(enhanced_area_offset, "%llu\n",
card->ext_csd.enhanced_area_offset);
MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
+MMC_DEV_ATTR(enhanced_rpmb_supported, "%#x\n",
+ card->ext_csd.enhanced_rpmb_supported);
MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);
-MMC_DEV_ATTR(ocr, "%08x\n", card->ocr);
+MMC_DEV_ATTR(ocr, "0x%08x\n", card->ocr);
+MMC_DEV_ATTR(rca, "0x%04x\n", card->rca);
MMC_DEV_ATTR(cmdq_en, "%d\n", card->ext_csd.cmdq_en);
static ssize_t mmc_fwrev_show(struct device *dev,
@@ -799,15 +824,14 @@ static ssize_t mmc_fwrev_show(struct device *dev,
{
struct mmc_card *card = mmc_dev_to_card(dev);
- if (card->ext_csd.rev < 7) {
- return sprintf(buf, "0x%x\n", card->cid.fwrev);
- } else {
- return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
- card->ext_csd.fwrev);
- }
+ if (card->ext_csd.rev < 7)
+ return sysfs_emit(buf, "0x%x\n", card->cid.fwrev);
+ else
+ return sysfs_emit(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
+ card->ext_csd.fwrev);
}
-static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
+static DEVICE_ATTR(fwrev, 0444, mmc_fwrev_show, NULL);
static ssize_t mmc_dsr_show(struct device *dev,
struct device_attribute *attr,
@@ -817,13 +841,13 @@ static ssize_t mmc_dsr_show(struct device *dev,
struct mmc_host *host = card->host;
if (card->csd.dsr_imp && host->dsr_req)
- return sprintf(buf, "0x%x\n", host->dsr);
+ return sysfs_emit(buf, "0x%x\n", host->dsr);
else
/* return default DSR value */
- return sprintf(buf, "0x%x\n", 0x404);
+ return sysfs_emit(buf, "0x%x\n", 0x404);
}
-static DEVICE_ATTR(dsr, S_IRUGO, mmc_dsr_show, NULL);
+static DEVICE_ATTR(dsr, 0444, mmc_dsr_show, NULL);
static struct attribute *mmc_std_attrs[] = {
&dev_attr_cid.attr,
@@ -831,6 +855,7 @@ static struct attribute *mmc_std_attrs[] = {
&dev_attr_date.attr,
&dev_attr_erase_size.attr,
&dev_attr_preferred_erase_size.attr,
+ &dev_attr_wp_grp_size.attr,
&dev_attr_fwrev.attr,
&dev_attr_ffu_capable.attr,
&dev_attr_hwrev.attr,
@@ -838,21 +863,24 @@ static struct attribute *mmc_std_attrs[] = {
&dev_attr_name.attr,
&dev_attr_oemid.attr,
&dev_attr_prv.attr,
+ &dev_attr_rev.attr,
&dev_attr_pre_eol_info.attr,
&dev_attr_life_time.attr,
&dev_attr_serial.attr,
&dev_attr_enhanced_area_offset.attr,
&dev_attr_enhanced_area_size.attr,
&dev_attr_raw_rpmb_size_mult.attr,
+ &dev_attr_enhanced_rpmb_supported.attr,
&dev_attr_rel_sectors.attr,
&dev_attr_ocr.attr,
+ &dev_attr_rca.attr,
&dev_attr_dsr.attr,
&dev_attr_cmdq_en.attr,
NULL,
};
ATTRIBUTE_GROUPS(mmc_std);
-static struct device_type mmc_type = {
+static const struct device_type mmc_type = {
.groups = mmc_std_groups,
};
@@ -932,7 +960,7 @@ static int mmc_select_powerclass(struct mmc_card *card)
int err, ddr;
/* Power class selection is supported for versions >= 4.0 */
- if (!mmc_can_ext_csd(card))
+ if (!mmc_card_can_ext_csd(card))
return 0;
bus_width = host->ios.bus_width;
@@ -984,16 +1012,18 @@ static int mmc_select_bus_width(struct mmc_card *card)
static unsigned ext_csd_bits[] = {
EXT_CSD_BUS_WIDTH_8,
EXT_CSD_BUS_WIDTH_4,
+ EXT_CSD_BUS_WIDTH_1,
};
static unsigned bus_widths[] = {
MMC_BUS_WIDTH_8,
MMC_BUS_WIDTH_4,
+ MMC_BUS_WIDTH_1,
};
struct mmc_host *host = card->host;
unsigned idx, bus_width = 0;
int err = 0;
- if (!mmc_can_ext_csd(card) ||
+ if (!mmc_card_can_ext_csd(card) ||
!(host->caps & (MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA)))
return 0;
@@ -1055,7 +1085,7 @@ static int mmc_select_hs(struct mmc_card *card)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
card->ext_csd.generic_cmd6_time, MMC_TIMING_MMC_HS,
- true, true, true);
+ true, true, MMC_CMD_RETRIES);
if (err)
pr_warn("%s: switch to high-speed failed, err:%d\n",
mmc_hostname(card->host), err);
@@ -1087,7 +1117,7 @@ static int mmc_select_hs_ddr(struct mmc_card *card)
ext_csd_bits,
card->ext_csd.generic_cmd6_time,
MMC_TIMING_MMC_DDR52,
- true, true, true);
+ true, true, MMC_CMD_RETRIES);
if (err) {
pr_err("%s: switch to bus width %d ddr failed\n",
mmc_hostname(host), 1 << bus_width);
@@ -1155,24 +1185,31 @@ static int mmc_select_hs400(struct mmc_card *card)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err) {
pr_err("%s: switch to high-speed from hs200 failed, err:%d\n",
mmc_hostname(host), err);
return err;
}
+ /* Prepare host to downgrade to HS timing */
+ if (host->ops->hs400_downgrade)
+ host->ops->hs400_downgrade(host);
+
/* Set host controller to HS timing */
- mmc_set_timing(card->host, MMC_TIMING_MMC_HS);
+ mmc_set_timing(host, MMC_TIMING_MMC_HS);
/* Reduce frequency to HS frequency */
max_dtr = card->ext_csd.hs_max_dtr;
mmc_set_clock(host, max_dtr);
- err = mmc_switch_status(card);
+ err = mmc_switch_status(card, true);
if (err)
goto out_err;
+ if (host->ops->hs400_prepare_ddr)
+ host->ops->hs400_prepare_ddr(host);
+
/* Switch card to DDR */
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_BUS_WIDTH,
@@ -1190,7 +1227,7 @@ static int mmc_select_hs400(struct mmc_card *card)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err) {
pr_err("%s: switch to hs400 failed, err:%d\n",
mmc_hostname(host), err);
@@ -1201,7 +1238,18 @@ static int mmc_select_hs400(struct mmc_card *card)
mmc_set_timing(host, MMC_TIMING_MMC_HS400);
mmc_set_bus_speed(card);
- err = mmc_switch_status(card);
+ if (host->ops->execute_hs400_tuning) {
+ mmc_retune_disable(host);
+ err = host->ops->execute_hs400_tuning(host, card);
+ mmc_retune_enable(host);
+ if (err)
+ goto out_err;
+ }
+
+ if (host->ops->hs400_complete)
+ host->ops->hs400_complete(host);
+
+ err = mmc_switch_status(card, true);
if (err)
goto out_err;
@@ -1233,26 +1281,29 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
val = EXT_CSD_TIMING_HS;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
val, card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err)
goto out_err;
+ if (host->ops->hs400_downgrade)
+ host->ops->hs400_downgrade(host);
+
mmc_set_timing(host, MMC_TIMING_MMC_DDR52);
- err = mmc_switch_status(card);
+ err = mmc_switch_status(card, true);
if (err)
goto out_err;
/* Switch HS DDR to HS */
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
EXT_CSD_BUS_WIDTH_8, card->ext_csd.generic_cmd6_time,
- 0, true, false, true);
+ 0, false, true, MMC_CMD_RETRIES);
if (err)
goto out_err;
mmc_set_timing(host, MMC_TIMING_MMC_HS);
- err = mmc_switch_status(card);
+ err = mmc_switch_status(card, true);
if (err)
goto out_err;
@@ -1261,7 +1312,7 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING,
val, card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err)
goto out_err;
@@ -1272,12 +1323,16 @@ int mmc_hs400_to_hs200(struct mmc_card *card)
* failed. If there really is a problem, we would expect tuning will
* fail and the result ends up the same.
*/
- err = __mmc_switch_status(card, false);
+ err = mmc_switch_status(card, false);
if (err)
goto out_err;
mmc_set_bus_speed(card);
+ /* Prepare tuning for HS400 mode. */
+ if (host->ops->prepare_hs400_tuning)
+ host->ops->prepare_hs400_tuning(host, &host->ios);
+
return 0;
out_err:
@@ -1286,17 +1341,34 @@ out_err:
return err;
}
+static void mmc_select_driver_type(struct mmc_card *card)
+{
+ int card_drv_type, drive_strength, drv_type = 0;
+ int fixed_drv_type = card->host->fixed_drv_type;
+
+ card_drv_type = card->ext_csd.raw_driver_strength |
+ mmc_driver_type_mask(0);
+
+ if (fixed_drv_type >= 0)
+ drive_strength = card_drv_type & mmc_driver_type_mask(fixed_drv_type)
+ ? fixed_drv_type : 0;
+ else
+ drive_strength = mmc_select_drive_strength(card,
+ card->ext_csd.hs200_max_dtr,
+ card_drv_type, &drv_type);
+
+ card->drive_strength = drive_strength;
+
+ if (drv_type)
+ mmc_set_driver_type(card->host, drv_type);
+}
+
static int mmc_select_hs400es(struct mmc_card *card)
{
struct mmc_host *host = card->host;
- int err = 0;
+ int err = -EINVAL;
u8 val;
- if (!(host->caps & MMC_CAP_8_BIT_DATA)) {
- err = -ENOTSUPP;
- goto out_err;
- }
-
if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400_1_2V)
err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);
@@ -1308,27 +1380,35 @@ static int mmc_select_hs400es(struct mmc_card *card)
goto out_err;
err = mmc_select_bus_width(card);
- if (err < 0)
+ if (err != MMC_BUS_WIDTH_8) {
+ pr_err("%s: switch to 8bit bus width failed, err:%d\n",
+ mmc_hostname(host), err);
+ err = err < 0 ? err : -ENOTSUPP;
goto out_err;
+ }
/* Switch card to HS mode */
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, EXT_CSD_TIMING_HS,
card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err) {
pr_err("%s: switch to hs for hs400es failed, err:%d\n",
mmc_hostname(host), err);
goto out_err;
}
+ /*
+ * Bump to HS timing and frequency. Some cards don't handle
+ * SEND_STATUS reliably at the initial frequency.
+ */
mmc_set_timing(host, MMC_TIMING_MMC_HS);
- err = mmc_switch_status(card);
+ mmc_set_bus_speed(card);
+
+ err = mmc_switch_status(card, true);
if (err)
goto out_err;
- mmc_set_clock(host, card->ext_csd.hs_max_dtr);
-
/* Switch card to DDR with strobe bit */
val = EXT_CSD_DDR_BUS_WIDTH_8 | EXT_CSD_BUS_WIDTH_STROBE;
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
@@ -1341,13 +1421,15 @@ static int mmc_select_hs400es(struct mmc_card *card)
goto out_err;
}
+ mmc_select_driver_type(card);
+
/* Switch card to HS400 */
val = EXT_CSD_TIMING_HS400 |
card->drive_strength << EXT_CSD_DRV_STR_SHIFT;
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err) {
pr_err("%s: switch to hs400es failed, err:%d\n",
mmc_hostname(host), err);
@@ -1362,7 +1444,7 @@ static int mmc_select_hs400es(struct mmc_card *card)
if (host->ops->hs400_enhanced_strobe)
host->ops->hs400_enhanced_strobe(host, &host->ios);
- err = mmc_switch_status(card);
+ err = mmc_switch_status(card, true);
if (err)
goto out_err;
@@ -1374,23 +1456,6 @@ out_err:
return err;
}
-static void mmc_select_driver_type(struct mmc_card *card)
-{
- int card_drv_type, drive_strength, drv_type;
-
- card_drv_type = card->ext_csd.raw_driver_strength |
- mmc_driver_type_mask(0);
-
- drive_strength = mmc_select_drive_strength(card,
- card->ext_csd.hs200_max_dtr,
- card_drv_type, &drv_type);
-
- card->drive_strength = drive_strength;
-
- if (drv_type)
- mmc_set_driver_type(card->host, drv_type);
-}
-
/*
* For device supporting HS200 mode, the following sequence
* should be done before executing the tuning process.
@@ -1401,7 +1466,7 @@ static void mmc_select_driver_type(struct mmc_card *card)
static int mmc_select_hs200(struct mmc_card *card)
{
struct mmc_host *host = card->host;
- unsigned int old_timing, old_signal_voltage;
+ unsigned int old_timing, old_signal_voltage, old_clock;
int err = -EINVAL;
u8 val;
@@ -1429,25 +1494,36 @@ static int mmc_select_hs200(struct mmc_card *card)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HS_TIMING, val,
card->ext_csd.generic_cmd6_time, 0,
- true, false, true);
+ false, true, MMC_CMD_RETRIES);
if (err)
goto err;
+
+ /*
+ * Bump to HS timing and frequency. Some cards don't handle
+ * SEND_STATUS reliably at the initial frequency.
+ * NB: We can't move to full (HS200) speeds until after we've
+ * successfully switched over.
+ */
old_timing = host->ios.timing;
+ old_clock = host->ios.clock;
mmc_set_timing(host, MMC_TIMING_MMC_HS200);
+ mmc_set_clock(card->host, card->ext_csd.hs_max_dtr);
/*
* For HS200, CRC errors are not a reliable way to know the
* switch failed. If there really is a problem, we would expect
* tuning will fail and the result ends up the same.
*/
- err = __mmc_switch_status(card, false);
+ err = mmc_switch_status(card, false);
/*
* mmc_select_timing() assumes timing has not changed if
* it is a switch error.
*/
- if (err == -EBADMSG)
+ if (err == -EBADMSG) {
+ mmc_set_clock(host, old_clock);
mmc_set_timing(host, old_timing);
+ }
}
err:
if (err) {
@@ -1468,16 +1544,26 @@ static int mmc_select_timing(struct mmc_card *card)
{
int err = 0;
- if (!mmc_can_ext_csd(card))
+ if (!mmc_card_can_ext_csd(card))
goto bus_speed;
- if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES)
+ if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS400ES) {
err = mmc_select_hs400es(card);
- else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200)
+ goto out;
+ }
+
+ if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200) {
err = mmc_select_hs200(card);
- else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
+ if (err == -EBADMSG)
+ card->mmc_avail_type &= ~EXT_CSD_CARD_TYPE_HS200;
+ else
+ goto out;
+ }
+
+ if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS)
err = mmc_select_hs(card);
+out:
if (err && err != -EBADMSG)
return err;
@@ -1562,6 +1648,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
if (oldcard) {
if (memcmp(cid, oldcard->raw_cid, sizeof(cid)) != 0) {
+ pr_debug("%s: Perhaps the card was replaced\n",
+ mmc_hostname(host));
err = -ENOENT;
goto err;
}
@@ -1651,6 +1739,12 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
mmc_set_erase_size(card);
}
+ /*
+ * Reselect the card type since host caps could have been changed when
+ * debugging even if the card is not new.
+ */
+ mmc_select_card_type(card);
+
/* Enable ERASE_GRP_DEF. This bit is lost after a reset or power off. */
if (card->ext_csd.rev >= 3) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
@@ -1661,7 +1755,6 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
goto free_card;
if (err) {
- err = 0;
/*
* Just disable enhanced area off & sz
* will try to enable ERASE_GROUP_DEF
@@ -1679,7 +1772,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
mmc_set_erase_size(card);
}
}
-
+ mmc_set_wp_grp_size(card);
/*
* Ensure eMMC user default partition is enabled
*/
@@ -1711,6 +1804,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
card->ext_csd.power_off_notification = EXT_CSD_POWER_ON;
}
+ /* set erase_arg */
+ if (mmc_card_can_discard(card))
+ card->erase_arg = MMC_DISCARD_ARG;
+ else if (mmc_card_can_trim(card))
+ card->erase_arg = MMC_TRIM_ARG;
+ else
+ card->erase_arg = MMC_ERASE_ARG;
+
/*
* Select timing interface
*/
@@ -1719,14 +1820,23 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
goto free_card;
if (mmc_card_hs200(card)) {
+ host->doing_init_tune = 1;
+
err = mmc_hs200_tuning(card);
- if (err)
- goto free_card;
+ if (!err)
+ err = mmc_select_hs400(card);
+
+ host->doing_init_tune = 0;
- err = mmc_select_hs400(card);
if (err)
goto free_card;
- } else if (!mmc_card_hs400es(card)) {
+ } else if (mmc_card_hs400es(card)) {
+ if (host->ops->execute_hs400_tuning) {
+ err = host->ops->execute_hs400_tuning(host, card);
+ if (err)
+ goto free_card;
+ }
+ } else {
/* Select the desired bus width optionally */
err = mmc_select_bus_width(card);
if (err > 0 && mmc_card_hs(card)) {
@@ -1753,20 +1863,25 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
if (err) {
pr_warn("%s: Enabling HPI failed\n",
mmc_hostname(card->host));
- err = 0;
- } else
+ card->ext_csd.hpi_en = 0;
+ } else {
card->ext_csd.hpi_en = 1;
+ }
}
/*
- * If cache size is higher than 0, this indicates
- * the existence of cache and it can be turned on.
+ * If cache size is higher than 0, this indicates the existence of cache
+ * and it can be turned on. Note that some eMMCs from Micron has been
+ * reported to need ~800 ms timeout, while enabling the cache after
+ * sudden power failure tests. Let's extend the timeout to a minimum of
+ * DEFAULT_CACHE_EN_TIMEOUT_MS and do it for all cards.
*/
- if (!mmc_card_broken_hpi(card) &&
- card->ext_csd.cache_size > 0) {
+ if (card->ext_csd.cache_size > 0) {
+ unsigned int timeout_ms = MIN_CACHE_EN_TIMEOUT_MS;
+
+ timeout_ms = max(card->ext_csd.generic_cmd6_time, timeout_ms);
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_CACHE_CTRL, 1,
- card->ext_csd.generic_cmd6_time);
+ EXT_CSD_CACHE_CTRL, 1, timeout_ms);
if (err && err != -EBADMSG)
goto free_card;
@@ -1777,42 +1892,58 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
pr_warn("%s: Cache is supported, but failed to turn on (%d)\n",
mmc_hostname(card->host), err);
card->ext_csd.cache_ctrl = 0;
- err = 0;
} else {
card->ext_csd.cache_ctrl = 1;
}
}
/*
+ * Enable Command Queue if supported. Note that Packed Commands cannot
+ * be used with Command Queue.
+ */
+ card->ext_csd.cmdq_en = false;
+ if (card->ext_csd.cmdq_support && host->caps2 & MMC_CAP2_CQE) {
+ err = mmc_cmdq_enable(card);
+ if (err && err != -EBADMSG)
+ goto free_card;
+ if (err) {
+ pr_warn("%s: Enabling CMDQ failed\n",
+ mmc_hostname(card->host));
+ card->ext_csd.cmdq_support = false;
+ card->ext_csd.cmdq_depth = 0;
+ }
+ }
+ /*
* In some cases (e.g. RPMB or mmc_test), the Command Queue must be
* disabled for a time, so a flag is needed to indicate to re-enable the
* Command Queue.
*/
card->reenable_cmdq = card->ext_csd.cmdq_en;
- /*
- * The mandatory minimum values are defined for packed command.
- * read: 5, write: 3
- */
- if (card->ext_csd.max_packed_writes >= 3 &&
- card->ext_csd.max_packed_reads >= 5 &&
- host->caps2 & MMC_CAP2_PACKED_CMD) {
- err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_EXP_EVENTS_CTRL,
- EXT_CSD_PACKED_EVENT_EN,
- card->ext_csd.generic_cmd6_time);
- if (err && err != -EBADMSG)
- goto free_card;
- if (err) {
- pr_warn("%s: Enabling packed event failed\n",
- mmc_hostname(card->host));
- card->ext_csd.packed_event_en = 0;
- err = 0;
- } else {
- card->ext_csd.packed_event_en = 1;
+ if (host->cqe_ops && !host->cqe_enabled) {
+ err = host->cqe_ops->cqe_enable(host, card);
+ if (!err) {
+ host->cqe_enabled = true;
+
+ if (card->ext_csd.cmdq_en) {
+ pr_info("%s: Command Queue Engine enabled\n",
+ mmc_hostname(host));
+ } else {
+ host->hsq_enabled = true;
+ pr_info("%s: Host Software Queue enabled\n",
+ mmc_hostname(host));
+ }
}
}
+ if (host->caps2 & MMC_CAP2_AVOID_3_3V &&
+ host->ios.signal_voltage == MMC_SIGNAL_VOLTAGE_330) {
+ pr_err("%s: Host failed to negotiate down from 3.3V\n",
+ mmc_hostname(host));
+ err = -EINVAL;
+ goto free_card;
+ }
+
if (!oldcard)
host->card = card;
@@ -1825,9 +1956,17 @@ err:
return err;
}
-static int mmc_can_sleep(struct mmc_card *card)
+static bool mmc_card_can_sleep(struct mmc_card *card)
{
- return (card && card->ext_csd.rev >= 3);
+ return card->ext_csd.rev >= 3;
+}
+
+static int mmc_sleep_busy_cb(void *cb_data, bool *busy)
+{
+ struct mmc_host *host = cb_data;
+
+ *busy = host->ops->card_busy(host);
+ return 0;
}
static int mmc_sleep(struct mmc_host *host)
@@ -1835,6 +1974,7 @@ static int mmc_sleep(struct mmc_host *host)
struct mmc_command cmd = {};
struct mmc_card *card = host->card;
unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000);
+ bool use_r1b_resp;
int err;
/* Re-tuning can't be done once the card is deselected */
@@ -1847,45 +1987,53 @@ static int mmc_sleep(struct mmc_host *host)
cmd.opcode = MMC_SLEEP_AWAKE;
cmd.arg = card->rca << 16;
cmd.arg |= 1 << 15;
-
- /*
- * If the max_busy_timeout of the host is specified, validate it against
- * the sleep cmd timeout. A failure means we need to prevent the host
- * from doing hw busy detection, which is done by converting to a R1
- * response instead of a R1B.
- */
- if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) {
- cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
- } else {
- cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
- cmd.busy_timeout = timeout_ms;
- }
+ use_r1b_resp = mmc_prepare_busy_cmd(host, &cmd, timeout_ms);
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
goto out_release;
/*
- * If the host does not wait while the card signals busy, then we will
- * will have to wait the sleep/awake timeout. Note, we cannot use the
- * SEND_STATUS command to poll the status because that command (and most
- * others) is invalid while the card sleeps.
+ * If the host does not wait while the card signals busy, then we can
+ * try to poll, but only if the host supports HW polling, as the
+ * SEND_STATUS cmd is not allowed. If we can't poll, then we simply need
+ * to wait the sleep/awake timeout.
*/
- if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
+ if (host->caps & MMC_CAP_WAIT_WHILE_BUSY && use_r1b_resp)
+ goto out_release;
+
+ if (!host->ops->card_busy) {
mmc_delay(timeout_ms);
+ goto out_release;
+ }
+
+ err = __mmc_poll_for_busy(host, 0, timeout_ms, &mmc_sleep_busy_cb, host);
out_release:
mmc_retune_release(host);
return err;
}
-static int mmc_can_poweroff_notify(const struct mmc_card *card)
+static bool mmc_card_can_poweroff_notify(const struct mmc_card *card)
{
return card &&
mmc_card_mmc(card) &&
(card->ext_csd.power_off_notification == EXT_CSD_POWER_ON);
}
+static bool mmc_host_can_poweroff_notify(const struct mmc_host *host,
+ enum mmc_poweroff_type pm_type)
+{
+ if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE)
+ return true;
+
+ if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE_IN_SUSPEND &&
+ pm_type == MMC_POWEROFF_SUSPEND)
+ return true;
+
+ return pm_type == MMC_POWEROFF_SHUTDOWN;
+}
+
static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
{
unsigned int timeout = card->ext_csd.generic_cmd6_time;
@@ -1897,7 +2045,7 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_OFF_NOTIFICATION,
- notify_type, timeout, 0, true, false, false);
+ notify_type, timeout, 0, false, false, MMC_CMD_RETRIES);
if (err)
pr_err("%s: Power Off Notification timed out, %u\n",
mmc_hostname(card->host), timeout);
@@ -1909,15 +2057,6 @@ static int mmc_poweroff_notify(struct mmc_card *card, unsigned int notify_type)
}
/*
- * Host is being removed. Free up the current card.
- */
-static void mmc_remove(struct mmc_host *host)
-{
- mmc_remove_card(host->card);
- host->card = NULL;
-}
-
-/*
* Card detection - card is alive.
*/
static int mmc_alive(struct mmc_host *host)
@@ -1932,17 +2071,18 @@ static void mmc_detect(struct mmc_host *host)
{
int err;
- mmc_get_card(host->card);
+ mmc_get_card(host->card, NULL);
/*
* Just check if our card has been removed.
*/
err = _mmc_detect_card_removed(host);
- mmc_put_card(host->card);
+ mmc_put_card(host->card, NULL);
if (err) {
- mmc_remove(host);
+ mmc_remove_card(host->card);
+ host->card = NULL;
mmc_claim_host(host);
mmc_detach_bus(host);
@@ -1951,31 +2091,62 @@ static void mmc_detect(struct mmc_host *host)
}
}
-static int _mmc_suspend(struct mmc_host *host, bool is_suspend)
+static bool _mmc_cache_enabled(struct mmc_host *host)
+{
+ return host->card->ext_csd.cache_size > 0 &&
+ host->card->ext_csd.cache_ctrl & 1;
+}
+
+/*
+ * Flush the internal cache of the eMMC to non-volatile storage.
+ */
+static int _mmc_flush_cache(struct mmc_host *host)
+{
+ int err = 0;
+
+ if (mmc_card_broken_cache_flush(host->card) && !host->card->written_flag)
+ return 0;
+
+ if (_mmc_cache_enabled(host)) {
+ err = mmc_switch(host->card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_FLUSH_CACHE, 1,
+ CACHE_FLUSH_TIMEOUT_MS);
+ if (err)
+ pr_err("%s: cache flush error %d\n", mmc_hostname(host), err);
+ else
+ host->card->written_flag = false;
+ }
+
+ return err;
+}
+
+static int _mmc_suspend(struct mmc_host *host, enum mmc_poweroff_type pm_type)
{
+ unsigned int notify_type = EXT_CSD_POWER_OFF_SHORT;
int err = 0;
- unsigned int notify_type = is_suspend ? EXT_CSD_POWER_OFF_SHORT :
- EXT_CSD_POWER_OFF_LONG;
+
+ if (pm_type == MMC_POWEROFF_SHUTDOWN)
+ notify_type = EXT_CSD_POWER_OFF_LONG;
mmc_claim_host(host);
if (mmc_card_suspended(host->card))
goto out;
- if (mmc_card_doing_bkops(host->card)) {
- err = mmc_stop_bkops(host->card);
+ /*
+ * For the undervoltage case, we care more about device integrity.
+ * Avoid cache flush and notify the device to power off quickly.
+ */
+ if (pm_type != MMC_POWEROFF_UNDERVOLTAGE) {
+ err = _mmc_flush_cache(host);
if (err)
goto out;
}
- err = mmc_flush_cache(host->card);
- if (err)
- goto out;
-
- if (mmc_can_poweroff_notify(host->card) &&
- ((host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) || !is_suspend))
+ if (mmc_card_can_poweroff_notify(host->card) &&
+ mmc_host_can_poweroff_notify(host, pm_type))
err = mmc_poweroff_notify(host->card, notify_type);
- else if (mmc_can_sleep(host->card))
+ else if (mmc_card_can_sleep(host->card))
err = mmc_sleep(host);
else if (!mmc_host_is_spi(host))
err = mmc_deselect_cards(host);
@@ -1990,13 +2161,27 @@ out:
}
/*
+ * Host is being removed. Free up the current card and do a graceful power-off.
+ */
+static void mmc_remove(struct mmc_host *host)
+{
+ get_device(&host->card->dev);
+ mmc_remove_card(host->card);
+
+ _mmc_suspend(host, MMC_POWEROFF_UNBIND);
+
+ put_device(&host->card->dev);
+ host->card = NULL;
+}
+
+/*
* Suspend callback
*/
static int mmc_suspend(struct mmc_host *host)
{
int err;
- err = _mmc_suspend(host, true);
+ err = _mmc_suspend(host, MMC_POWEROFF_SUSPEND);
if (!err) {
pm_runtime_disable(&host->card->dev);
pm_runtime_set_suspended(&host->card->dev);
@@ -2035,15 +2220,23 @@ static int mmc_shutdown(struct mmc_host *host)
int err = 0;
/*
- * In a specific case for poweroff notify, we need to resume the card
- * before we can shutdown it properly.
+ * In case of undervoltage, the card will be powered off (removed) by
+ * _mmc_handle_undervoltage()
+ */
+ if (mmc_card_removed(host->card))
+ return 0;
+
+ /*
+ * If the card remains suspended at this point and it was done by using
+ * the sleep-cmd (CMD5), we may need to re-initialize it first, to allow
+ * us to send the preferred poweroff-notification cmd at shutdown.
*/
- if (mmc_can_poweroff_notify(host->card) &&
- !(host->caps2 & MMC_CAP2_FULL_PWR_CYCLE))
+ if (mmc_card_can_poweroff_notify(host->card) &&
+ !mmc_host_can_poweroff_notify(host, MMC_POWEROFF_SUSPEND))
err = _mmc_resume(host);
if (!err)
- err = _mmc_suspend(host, false);
+ err = _mmc_suspend(host, MMC_POWEROFF_SHUTDOWN);
return err;
}
@@ -2067,7 +2260,7 @@ static int mmc_runtime_suspend(struct mmc_host *host)
if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
return 0;
- err = _mmc_suspend(host, true);
+ err = _mmc_suspend(host, MMC_POWEROFF_SUSPEND);
if (err)
pr_err("%s: error %d doing aggressive suspend\n",
mmc_hostname(host), err);
@@ -2090,17 +2283,15 @@ static int mmc_runtime_resume(struct mmc_host *host)
return 0;
}
-static int mmc_can_reset(struct mmc_card *card)
+static bool mmc_card_can_reset(struct mmc_card *card)
{
u8 rst_n_function;
rst_n_function = card->ext_csd.rst_n_function;
- if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
- return 0;
- return 1;
+ return ((rst_n_function & EXT_CSD_RST_N_EN_MASK) == EXT_CSD_RST_N_ENABLED);
}
-static int mmc_reset(struct mmc_host *host)
+static int _mmc_hw_reset(struct mmc_host *host)
{
struct mmc_card *card = host->card;
@@ -2108,13 +2299,13 @@ static int mmc_reset(struct mmc_host *host)
* In the case of recovery, we can't expect flushing the cache to work
* always, but we have a go and ignore errors.
*/
- mmc_flush_cache(host->card);
+ _mmc_flush_cache(host);
- if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
- mmc_can_reset(card)) {
+ if ((host->caps & MMC_CAP_HW_RESET) && host->ops->card_hw_reset &&
+ mmc_card_can_reset(card)) {
/* If the card accept RST_n signal, send it. */
mmc_set_clock(host, host->f_init);
- host->ops->hw_reset(host);
+ host->ops->card_hw_reset(host);
/* Set initial state and call mmc_set_ios */
mmc_set_initial_state(host);
} else {
@@ -2125,6 +2316,55 @@ static int mmc_reset(struct mmc_host *host)
return mmc_init_card(host, card->ocr, card);
}
+/**
+ * _mmc_handle_undervoltage - Handle an undervoltage event for MMC/eMMC devices
+ * @host: MMC host structure
+ *
+ * This function is triggered when an undervoltage condition is detected.
+ * It attempts to transition the device into a low-power or safe state to
+ * prevent data corruption.
+ *
+ * Steps performed:
+ * - Perform an emergency suspend using EXT_CSD_POWER_OFF_SHORT if possible.
+ * - If power-off notify is not supported, fallback mechanisms like sleep or
+ * deselecting the card are attempted.
+ * - Cache flushing is skipped to reduce execution time.
+ * - Mark the card as removed to prevent further interactions after
+ * undervoltage.
+ *
+ * Note: This function does not handle host claiming or releasing. The caller
+ * must ensure that the host is properly claimed before calling this
+ * function and released afterward.
+ *
+ * Returns: 0 on success, or a negative error code if any step fails.
+ */
+static int _mmc_handle_undervoltage(struct mmc_host *host)
+{
+ struct mmc_card *card = host->card;
+ int err;
+
+ /*
+ * Perform an emergency suspend to power off the eMMC quickly.
+ * This ensures the device enters a safe state before power is lost.
+ * We first attempt EXT_CSD_POWER_OFF_SHORT, but if power-off notify
+ * is not supported, we fall back to sleep mode or deselecting the card.
+ * Cache flushing is skipped to minimize delay.
+ */
+ err = _mmc_suspend(host, MMC_POWEROFF_UNDERVOLTAGE);
+ if (err)
+ pr_err("%s: undervoltage suspend failed: %pe\n",
+ mmc_hostname(host), ERR_PTR(err));
+
+ /*
+ * Mark the card as removed to prevent further operations.
+ * This ensures the system does not attempt to access the device
+ * after an undervoltage event, avoiding potential corruption.
+ */
+ mmc_card_set_removed(card);
+
+ return err;
+}
+
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
.detect = mmc_detect,
@@ -2134,7 +2374,10 @@ static const struct mmc_bus_ops mmc_ops = {
.runtime_resume = mmc_runtime_resume,
.alive = mmc_alive,
.shutdown = mmc_shutdown,
- .reset = mmc_reset,
+ .hw_reset = _mmc_hw_reset,
+ .cache_enabled = _mmc_cache_enabled,
+ .flush_cache = _mmc_flush_cache,
+ .handle_undervoltage = _mmc_handle_undervoltage,
};
/*
generated by cgit (git 2.34.1) at 2025-12-24 22:53:01 +0000