From patchwork Fri May 20 08:36:00 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shawn Lin X-Patchwork-Id: 9128965 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 4B49C60467 for ; Fri, 20 May 2016 08:38:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3D10D1FF65 for ; Fri, 20 May 2016 08:38:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 318E32793B; Fri, 20 May 2016 08:38:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 958EB1FF65 for ; Fri, 20 May 2016 08:38:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933211AbcETIg3 (ORCPT ); Fri, 20 May 2016 04:36:29 -0400 Received: from lucky1.263xmail.com ([211.157.147.132]:43480 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932354AbcETIgZ (ORCPT ); Fri, 20 May 2016 04:36:25 -0400 Received: from shawn.lin?rock-chips.com (unknown [192.168.167.105]) by lucky1.263xmail.com (Postfix) with SMTP id 0528D63525; Fri, 20 May 2016 16:36:14 +0800 (CST) X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.263.net (Postfix) with ESMTP id 240742426D; Fri, 20 May 2016 16:36:09 +0800 (CST) X-RL-SENDER: shawn.lin@rock-chips.com X-FST-TO: ulf.hansson@linaro.org X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: shawn.lin@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-SENDER: lintao@rock-chips.com X-DNS-TYPE: 0 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (Postfix) whith ESMTP id 17158NJQ67D; Fri, 20 May 2016 16:36:10 +0800 (CST) From: Shawn Lin To: Ulf Hansson Cc: Adrian Hunter , Jaehoon Chung , Michal Simek , soren.brinkmann@xilinx.com, Rob Herring , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Anderson , Brian Norris , Heiko Stuebner , linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, Shawn Lin Subject: [PATCH v4 3/5] mmc: core: implement enhanced strobe support Date: Fri, 20 May 2016 16:36:00 +0800 Message-Id: <1463733360-902-1-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1463733285-770-1-git-send-email-shawn.lin@rock-chips.com> References: <1463733285-770-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Controllers use data strobe line to latch data from devices under hs400 mode, but not for cmd line. So since emmc 5.1, JEDEC introduces enhanced strobe mode for latching cmd response from emmc devices to host controllers. This new feature is optional, so it depends both on device's cap and host's cap to decide whether to use it or not. Signed-off-by: Shawn Lin --- Changes in v4: None Changes in v3: None Changes in v2: None drivers/mmc/core/bus.c | 3 +- drivers/mmc/core/core.c | 8 +++++ drivers/mmc/core/mmc.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++-- include/linux/mmc/card.h | 1 + include/linux/mmc/host.h | 11 +++++++ include/linux/mmc/mmc.h | 3 ++ 6 files changed, 107 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c index 4bc48f1..c64266f 100644 --- a/drivers/mmc/core/bus.c +++ b/drivers/mmc/core/bus.c @@ -332,12 +332,13 @@ int mmc_add_card(struct mmc_card *card) mmc_card_ddr52(card) ? "DDR " : "", type); } else { - pr_info("%s: new %s%s%s%s%s card at address %04x\n", + pr_info("%s: new %s%s%s%s%s%s card at address %04x\n", mmc_hostname(card->host), mmc_card_uhs(card) ? "ultra high speed " : (mmc_card_hs(card) ? "high speed " : ""), mmc_card_hs400(card) ? "HS400 " : (mmc_card_hs200(card) ? "HS200 " : ""), + mmc_card_hs400es(card) ? "Enhanced strobe " : "", mmc_card_ddr52(card) ? "DDR " : "", uhs_bus_speed_mode, type, card->rca); } diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 99275e4..a559501 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1127,6 +1127,14 @@ void mmc_set_initial_state(struct mmc_host *host) host->ios.bus_width = MMC_BUS_WIDTH_1; host->ios.timing = MMC_TIMING_LEGACY; host->ios.drv_type = 0; + host->ios.enhanced_strobe = false; + + /* + * Make sure we are in non-enhanced strobe mode before we + * actually enable it in ext_csd. + */ + if (host->ops->hs400_enhanced_strobe) + host->ops->hs400_enhanced_strobe(host, &host->ios); mmc_set_ios(host); } diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index f99c47e..9dc91ba 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -235,6 +235,11 @@ static void mmc_select_card_type(struct mmc_card *card) avail_type |= EXT_CSD_CARD_TYPE_HS400_1_2V; } + if ((caps2 & MMC_CAP2_HS400_ES) && + card->ext_csd.strobe_support && + (avail_type & EXT_CSD_CARD_TYPE_HS400)) + avail_type |= EXT_CSD_CARD_TYPE_HS400ES; + card->ext_csd.hs_max_dtr = hs_max_dtr; card->ext_csd.hs200_max_dtr = hs200_max_dtr; card->mmc_avail_type = avail_type; @@ -383,6 +388,7 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) mmc_card_set_blockaddr(card); } + 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); @@ -1216,6 +1222,78 @@ out_err: return err; } +static int mmc_select_hs400es(struct mmc_card *card) +{ + struct mmc_host *host = card->host; + int err = 0; + u8 val; + + if (!(host->caps & MMC_CAP_8_BIT_DATA)) { + err = -ENOTSUPP; + goto out_err; + } + + err = mmc_select_bus_width(card); + if (IS_ERR_VALUE(err)) + goto out_err; + + /* Switch card to HS mode */ + err = mmc_select_hs(card); + if (err) { + pr_err("%s: switch to high-speed failed, err:%d\n", + mmc_hostname(host), err); + goto out_err; + } + + err = mmc_switch_status(card); + if (err) + goto out_err; + + /* 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, + EXT_CSD_BUS_WIDTH, + val, + card->ext_csd.generic_cmd6_time); + if (err) { + pr_err("%s: switch to bus width for hs400es failed, err:%d\n", + mmc_hostname(host), err); + goto out_err; + } + + /* 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, + true, false, true); + if (err) { + pr_err("%s: switch to hs400es failed, err:%d\n", + mmc_hostname(host), err); + goto out_err; + } + + /* Set host controller to HS400 timing and frequency */ + mmc_set_timing(host, MMC_TIMING_MMC_HS400); + + /* Controller enable enhanced strobe function */ + host->ios.enhanced_strobe = true; + if (host->ops->hs400_enhanced_strobe) + host->ops->hs400_enhanced_strobe(host, &host->ios); + + err = mmc_switch_status(card); + if (err) + goto out_err; + + return 0; + +out_err: + pr_err("%s: %s failed, error %d\n", mmc_hostname(card->host), + __func__, err); + return err; +} + static void mmc_select_driver_type(struct mmc_card *card) { int card_drv_type, drive_strength, drv_type; @@ -1297,7 +1375,7 @@ err: } /* - * Activate High Speed or HS200 mode if supported. + * Activate High Speed, HS200 or HS400ES mode if supported. */ static int mmc_select_timing(struct mmc_card *card) { @@ -1306,7 +1384,9 @@ static int mmc_select_timing(struct mmc_card *card) if (!mmc_can_ext_csd(card)) goto bus_speed; - if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS200) + 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) err = mmc_select_hs200(card); else if (card->mmc_avail_type & EXT_CSD_CARD_TYPE_HS) err = mmc_select_hs(card); diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h index eb0151b..22defc2 100644 --- a/include/linux/mmc/card.h +++ b/include/linux/mmc/card.h @@ -95,6 +95,7 @@ struct mmc_ext_csd { u8 raw_partition_support; /* 160 */ u8 raw_rpmb_size_mult; /* 168 */ u8 raw_erased_mem_count; /* 181 */ + u8 strobe_support; /* 184 */ u8 raw_ext_csd_structure; /* 194 */ u8 raw_card_type; /* 196 */ u8 raw_driver_strength; /* 197 */ diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 2a06fb0..0eabb72 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -19,6 +19,7 @@ #include #include +#include #include struct mmc_ios { @@ -77,6 +78,8 @@ struct mmc_ios { #define MMC_SET_DRIVER_TYPE_A 1 #define MMC_SET_DRIVER_TYPE_C 2 #define MMC_SET_DRIVER_TYPE_D 3 + + bool enhanced_strobe; /* hs400es selection */ }; struct mmc_host_ops { @@ -143,6 +146,9 @@ struct mmc_host_ops { /* Prepare HS400 target operating frequency depending host driver */ int (*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios); + /* Prepare enhanced strobe depending host driver */ + void (*hs400_enhanced_strobe)(struct mmc_host *host, + struct mmc_ios *ios); int (*select_drive_strength)(struct mmc_card *card, unsigned int max_dtr, int host_drv, int card_drv, int *drv_type); @@ -513,6 +519,11 @@ static inline bool mmc_card_hs400(struct mmc_card *card) return card->host->ios.timing == MMC_TIMING_MMC_HS400; } +static inline bool mmc_card_hs400es(struct mmc_card *card) +{ + return card->host->ios.enhanced_strobe; +} + void mmc_retune_timer_stop(struct mmc_host *host); static inline void mmc_retune_needed(struct mmc_host *host) diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index 15f2c4a..c376209 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -297,6 +297,7 @@ struct _mmc_csd { #define EXT_CSD_PART_CONFIG 179 /* R/W */ #define EXT_CSD_ERASED_MEM_CONT 181 /* RO */ #define EXT_CSD_BUS_WIDTH 183 /* R/W */ +#define EXT_CSD_STROBE_SUPPORT 184 /* RO */ #define EXT_CSD_HS_TIMING 185 /* R/W */ #define EXT_CSD_POWER_CLASS 187 /* R/W */ #define EXT_CSD_REV 192 /* RO */ @@ -380,12 +381,14 @@ struct _mmc_csd { #define EXT_CSD_CARD_TYPE_HS400_1_2V (1<<7) /* Card can run at 200MHz DDR, 1.2V */ #define EXT_CSD_CARD_TYPE_HS400 (EXT_CSD_CARD_TYPE_HS400_1_8V | \ EXT_CSD_CARD_TYPE_HS400_1_2V) +#define EXT_CSD_CARD_TYPE_HS400ES (1<<8) /* Card can run at HS400ES */ #define EXT_CSD_BUS_WIDTH_1 0 /* Card is in 1 bit mode */ #define EXT_CSD_BUS_WIDTH_4 1 /* Card is in 4 bit mode */ #define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */ #define EXT_CSD_DDR_BUS_WIDTH_4 5 /* Card is in 4 bit DDR mode */ #define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */ +#define EXT_CSD_BUS_WIDTH_STROBE BIT(7) /* Enhanced strobe mode */ #define EXT_CSD_TIMING_BC 0 /* Backwards compatility */ #define EXT_CSD_TIMING_HS 1 /* High speed */