From patchwork Thu Jan 13 12:57:27 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chuanxiao.Dong" X-Patchwork-Id: 475931 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p0DD2kKB005444 for ; Thu, 13 Jan 2011 13:02:46 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754728Ab1AMNCp (ORCPT ); Thu, 13 Jan 2011 08:02:45 -0500 Received: from mga11.intel.com ([192.55.52.93]:30263 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751498Ab1AMNCo (ORCPT ); Thu, 13 Jan 2011 08:02:44 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP; 13 Jan 2011 05:02:44 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.60,317,1291622400"; d="scan'208";a="877176205" Received: from unknown (HELO intel.com) ([172.16.120.128]) by fmsmga001.fm.intel.com with ESMTP; 13 Jan 2011 05:02:43 -0800 Date: Thu, 13 Jan 2011 20:57:27 +0800 From: Chuanxiao Dong To: linux-mmc@vger.kernel.org, cjb@laptop.org Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Subject: [PATCH v2 1/1]mmc: implemented eMMC4.4 enhanced area feature Message-ID: <20110113125727.GA20452@intel.com> Reply-To: Chuanxiao Dong MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Thu, 13 Jan 2011 13:02:46 +0000 (UTC) diff --git a/Documentation/ABI/testing/sysfs-devices-mmc b/Documentation/ABI/testing/sysfs-devices-mmc new file mode 100644 index 0000000..f0fb053 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-mmc @@ -0,0 +1,19 @@ +What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_offset +Date: January 2011 +Contact: Chuanxiao Dong +Description: + Enhanced area is a new feature defined in eMMC4.4 standard. + eMMC4.4 or later card can support such feature. This kind of area + can help to improve the card performance. If the feature is enabled, + this attribute will indicate the start address of enhanced data + area. If not, this attribute will be 0. Unit Byte. + +What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_size +Date: January 2011 +Contact: Chuanxiao Dong +Description: + Enhanced area is a new feature defined in eMMC4.4 standard. + eMMC4.4 or later card can support such feature. This kind of area + can help to improve the card performance. If the feature is enabled, + this attribute will indicate the size of enhanced data area. If not, + this attribute will be 0. Unit KBytes. diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 16006ef..c8b5b3b 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -302,6 +302,41 @@ static int mmc_read_ext_csd(struct mmc_card *card) } if (card->ext_csd.rev >= 4) { + /* + * Enhanced area feature support + * check whether eMMC card is enabled enhanced area, + * if so, export enhanced area offset and size to + * user by adding sysfs interface + */ + if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) && + (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) { + u8 hc_erase_grp_sz = + ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE]; + u8 hc_wp_grp_sz = + ext_csd[EXT_CSD_HC_WP_GRP_SIZE]; + /* + * set a flag to identify whether the enhanced + * user data are enabled + */ + card->ext_csd.enhanced_area_en = 1; + /* + * caculate the enhanced data area offset, unit B + */ + card->ext_csd.enhanced_area_offset = + (ext_csd[139] << 24) + (ext_csd[138] << 16) + + (ext_csd[137] << 8) + ext_csd[136]; + if (mmc_card_blockaddr(card)) + card->ext_csd.enhanced_area_offset <<= 9; + /* + * caculate the enhanced data area size, unit KB + */ + card->ext_csd.enhanced_area_size = + (ext_csd[142] << 16) + (ext_csd[141] << 8) + + ext_csd[140]; + card->ext_csd.enhanced_area_size *= + (size_t)(hc_erase_grp_sz * hc_wp_grp_sz); + card->ext_csd.enhanced_area_size <<= 9; + } card->ext_csd.sec_trim_mult = ext_csd[EXT_CSD_SEC_TRIM_MULT]; card->ext_csd.sec_erase_mult = @@ -336,6 +371,9 @@ 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(serial, "0x%08x\n", card->cid.serial); +MMC_DEV_ATTR(enhanced_area_offset, "0x%llxB\n", + card->ext_csd.enhanced_area_offset); +MMC_DEV_ATTR(enhanced_area_size, "0x%xKB\n", card->ext_csd.enhanced_area_size); static struct attribute *mmc_std_attrs[] = { &dev_attr_cid.attr, @@ -349,6 +387,8 @@ static struct attribute *mmc_std_attrs[] = { &dev_attr_name.attr, &dev_attr_oemid.attr, &dev_attr_serial.attr, + &dev_attr_enhanced_area_offset.attr, + &dev_attr_enhanced_area_size.attr, NULL, }; @@ -484,6 +524,39 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, } /* + * If enhanced_area_en is TRUE, host need to enable + * ERASE_GRP_DEF bit. + * ERASE_GRP_DEF bit will be lost everytime + * after a reset or power off. + */ + if (card->ext_csd.enhanced_area_en) { + err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, + EXT_CSD_ERASE_GROUP_DEF, 1); + + if (err && err != -EBADMSG) + goto free_card; + + if (err) { + err = 0; + /* + * Just disable enhanced area off & sz + * will try to enable ERASE_GROUP_DEF + * during next time reinit + */ + card->ext_csd.enhanced_area_offset = 0; + card->ext_csd.enhanced_area_size = 0; + } else { + card->ext_csd.erase_group_def = 1; + /* + * enable ERASE_GRP_DEF successfully. + * This will affect the erase size, so + * here need to reset erase size + */ + mmc_set_erase_size(card); + } + } + + /* * Activate high speed (if supported) */ if ((card->ext_csd.hs_max_dtr != 0) && diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index 8ce0827..cc9a07e 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -54,6 +54,9 @@ struct mmc_ext_csd { unsigned int sec_trim_mult; /* Secure trim multiplier */ unsigned int sec_erase_mult; /* Secure erase multiplier */ unsigned int trim_timeout; /* In milliseconds */ + bool enhanced_area_en; /* enhanced area enable bit */ + loff_t enhanced_area_offset; /* enhanced area addr */ + size_t enhanced_area_size; /* enhanced area size */ }; struct sd_scr { diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 612301f..c50ede6 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -253,6 +253,8 @@ struct _mmc_csd { * EXT_CSD fields */ +#define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */ +#define EXT_CSD_PARTITION_SUPPORT 160 /* RO */ #define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */ #define EXT_CSD_ERASED_MEM_CONT 181 /* RO */ #define EXT_CSD_BUS_WIDTH 183 /* R/W */ @@ -262,6 +264,7 @@ struct _mmc_csd { #define EXT_CSD_CARD_TYPE 196 /* RO */ #define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */ #define EXT_CSD_S_A_TIMEOUT 217 /* RO */ +#define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */ #define EXT_CSD_ERASE_TIMEOUT_MULT 223 /* RO */ #define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */ #define EXT_CSD_SEC_TRIM_MULT 229 /* RO */