linux-kernel - [PATCH v1 1/3] mmc: record wp_grp_size and boot_wp

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Message-ID: <1583290915-9858-2-git-send-email-light.hsieh@mediatek.com>
Date:   Wed, 4 Mar 2020 11:01:53 +0800
From:   <light.hsieh@...iatek.com>
To:     <ulf.hansson@...aro.org>
CC:     <linux-mediatek@...ts.infradead.org>, <axboe@...nel.dk>,
        <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kuohong.wang@...iatek.com>, <stanley.chu@...iatek.com>,
        Light Hsieh <light.hsieh@...iatek.com>
Subject: [PATCH v1 1/3] mmc: record wp_grp_size and boot_wp_status

From: Light Hsieh <light.hsieh@...iatek.com>

1. record wp_grp_size (write-protection group size) in struct mmc_csd and
   struct mmc_card.
2. record boot_wp_status (boot partition write-protection status) in struct
   mmc_ext_csd.

Signed-off-by: Light Hsieh <light.hsieh@...iatek.com>
---
 drivers/mmc/core/mmc.c   | 16 ++++++++++++++++
 include/linux/mmc/card.h |  3 +++
 include/linux/mmc/mmc.h  |  1 +
 3 files changed, 20 insertions(+)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index f6912de..77305c8 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -127,6 +127,16 @@ 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.
  */
@@ -177,6 +187,7 @@ static int mmc_decode_csd(struct mmc_card *card)
 		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;
@@ -496,6 +507,8 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd)
 		card->ext_csd.boot_ro_lock = ext_csd[EXT_CSD_BOOT_WP];
 		card->ext_csd.boot_ro_lockable = true;
 
+		card->ext_csd.boot_wp_status = ext_csd[EXT_CSD_BOOT_WP_STATUS];
+
 		/* Save power class values */
 		card->ext_csd.raw_pwr_cl_52_195 =
 			ext_csd[EXT_CSD_PWR_CL_52_195];
@@ -769,6 +782,7 @@ static int mmc_compare_ext_csds(struct mmc_card *card, unsigned bus_width)
 	card->raw_csd[2], card->raw_csd[3]);
 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(wp_grp_size, "%u\n", card->wp_grp_size << 9);
 MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
 MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
 MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
@@ -828,6 +842,7 @@ static ssize_t mmc_dsr_show(struct device *dev,
 	&dev_attr_csd.attr,
 	&dev_attr_date.attr,
 	&dev_attr_erase_size.attr,
+	&dev_attr_wp_grp_size.attr,
 	&dev_attr_preferred_erase_size.attr,
 	&dev_attr_fwrev.attr,
 	&dev_attr_ffu_capable.attr,
@@ -1709,6 +1724,7 @@ 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
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index cf3780a..0139461 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -32,6 +32,7 @@ struct mmc_csd {
 	unsigned int		r2w_factor;
 	unsigned int		max_dtr;
 	unsigned int		erase_size;		/* In sectors */
+	unsigned int		wp_grp_size;
 	unsigned int		read_blkbits;
 	unsigned int		write_blkbits;
 	unsigned int		capacity;
@@ -94,6 +95,7 @@ struct mmc_ext_csd {
 	u8			raw_exception_status;	/* 54 */
 	u8			raw_partition_support;	/* 160 */
 	u8			raw_rpmb_size_mult;	/* 168 */
+	u8			boot_wp_status;	        /* 174 */
 	u8			raw_erased_mem_count;	/* 181 */
 	u8			strobe_support;		/* 184 */
 	u8			raw_ext_csd_structure;	/* 194 */
@@ -278,6 +280,7 @@ struct mmc_card {
 	unsigned int		eg_boundary;	/* don't cross erase-group boundaries */
 	unsigned int		erase_arg;	/* erase / trim / discard */
  	u8			erased_byte;	/* value of erased bytes */
+	unsigned int		wp_grp_size;    /* write group size(sectors) */
 
 	u32			raw_cid[4];	/* raw card CID */
 	u32			raw_csd[4];	/* raw card CSD */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 897a87c..2c9d988 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -259,6 +259,7 @@ static inline bool mmc_op_multi(u32 opcode)
 #define EXT_CSD_RPMB_MULT		168	/* RO */
 #define EXT_CSD_FW_CONFIG		169	/* R/W */
 #define EXT_CSD_BOOT_WP			173	/* R/W */
+#define EXT_CSD_BOOT_WP_STATUS		174	/* RO */
 #define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */
 #define EXT_CSD_PART_CONFIG		179	/* R/W */
 #define EXT_CSD_ERASED_MEM_CONT		181	/* RO */
-- 
1.8.1.1.dirty