From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrei Warkentin Subject: [patchv2 2/3] MMC: Implement MMC_CAP_CMD23 for SDHCI. Date: Fri, 15 Apr 2011 18:51:43 -0500 Message-ID: <1302911504-18287-2-git-send-email-andreiw@motorola.com> References: <1302741523-22276-1-git-send-email-andreiw@motorola.com> Return-path: Received: from exprod5og111.obsmtp.com ([64.18.0.22]:44511 "EHLO exprod5og111.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753127Ab1DOXNT (ORCPT ); Fri, 15 Apr 2011 19:13:19 -0400 Received: from DE01MGRG01.AM.MOT-MOBILITY.COM ([10.22.94.168]) by DE01MGRG01.AM.MOT-MOBILITY.COM (8.14.3/8.14.3) with ESMTP id p3FNDgaq027074 for ; Fri, 15 Apr 2011 19:13:42 -0400 (EDT) Received: from mail-yx0-f170.google.com (mail-yx0-f170.google.com [209.85.213.170]) by DE01MGRG01.AM.MOT-MOBILITY.COM (8.14.3/8.14.3) with ESMTP id p3FNDfEB027063 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=OK) for ; Fri, 15 Apr 2011 19:13:41 -0400 (EDT) Received: by yxi11 with SMTP id 11so2197047yxi.15 for ; Fri, 15 Apr 2011 16:13:16 -0700 (PDT) In-Reply-To: <1302741523-22276-1-git-send-email-andreiw@motorola.com> Sender: linux-mmc-owner@vger.kernel.org List-Id: linux-mmc@vger.kernel.org To: linux-mmc@vger.kernel.org Cc: Andrei Warkentin , arindam.nath@amd.com, cjb@laptop.org, arnd@arndb.de Implements support for multiblock transfers bounded by SET_BLOCK_COUNT (CMD23). Cc: arindam.nath@amd.com Cc: cjb@laptop.org Cc: arnd@arndb.de Signed-off-by: Andrei Warkentin --- drivers/mmc/host/sdhci.c | 60 +++++++++++++++++++++++++++++++++------------ 1 files changed, 44 insertions(+), 16 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 94793f2..0b71ce8 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -822,9 +822,10 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd) } static void sdhci_set_transfer_mode(struct sdhci_host *host, - struct mmc_data *data) + struct mmc_command *cmd) { u16 mode; + struct mmc_data *data = cmd->data; if (data == NULL) return; @@ -832,11 +833,17 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host, WARN_ON(!host->data); mode = SDHCI_TRNS_BLK_CNT_EN; - if (data->blocks > 1) { - if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) - mode |= SDHCI_TRNS_MULTI | SDHCI_TRNS_ACMD12; - else - mode |= SDHCI_TRNS_MULTI; + if (mmc_op_multi(cmd->opcode) || + data->blocks > 1) { + mode |= SDHCI_TRNS_MULTI; + + /* + * If we are sending CMD23, CMD12 never gets sent + * on successful completion. + */ + if (!host->mrq->sbc && + host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) + mode |= SDHCI_TRNS_ACMD12; } if (data->flags & MMC_DATA_READ) mode |= SDHCI_TRNS_READ; @@ -877,7 +884,15 @@ static void sdhci_finish_data(struct sdhci_host *host) else data->bytes_xfered = data->blksz * data->blocks; - if (data->stop) { + /* + * Need to send CMD12 if - + * a) open-ended multiblock transfer (no CMD23) + * b) error in multiblock transfer + */ + if (data->stop && + (data->error || + !host->mrq->sbc)) { + /* * The controller needs a reset of internal state machines * upon error conditions. @@ -933,7 +948,7 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT); - sdhci_set_transfer_mode(host, cmd->data); + sdhci_set_transfer_mode(host, cmd); if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) { printk(KERN_ERR "%s: Unsupported response type!\n", @@ -986,13 +1001,21 @@ static void sdhci_finish_command(struct sdhci_host *host) host->cmd->error = 0; - if (host->data && host->data_early) - sdhci_finish_data(host); + /* Finished CMD23, now send actual command. */ + if (host->cmd == host->mrq->sbc) { + host->cmd = NULL; + sdhci_send_command(host, host->mrq->cmd); + } else { - if (!host->cmd->data) - tasklet_schedule(&host->finish_tasklet); + /* Processed actual command. */ + if (host->data && host->data_early) + sdhci_finish_data(host); - host->cmd = NULL; + if (!host->cmd->data) + tasklet_schedule(&host->finish_tasklet); + + host->cmd = NULL; + } } static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock) @@ -1159,8 +1182,13 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) if (!present || host->flags & SDHCI_DEVICE_DEAD) { host->mrq->cmd->error = -ENOMEDIUM; tasklet_schedule(&host->finish_tasklet); - } else - sdhci_send_command(host, mrq->cmd); + } else { + + if (mrq->sbc) + sdhci_send_command(host, mrq->sbc); + else + sdhci_send_command(host, mrq->cmd); + } mmiowb(); spin_unlock_irqrestore(&host->lock, flags); @@ -1909,7 +1937,7 @@ int sdhci_add_host(struct sdhci_host *host) mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200; mmc->f_max = host->max_clk; - mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE; + mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23; /* * A controller may support 8-bit width, but the board itself -- 1.7.0.4