From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrei Warkentin Subject: [patchv3 3/5] MMC: Implement MMC_CAP_CMD23 for SDHCI. Date: Sat, 16 Apr 2011 05:40:56 -0500 Message-ID: <1302950458-1969-4-git-send-email-andreiw@motorola.com> References: <1302741523-22276-1-git-send-email-andreiw@motorola.com> Return-path: Received: from exprod5og113.obsmtp.com ([64.18.0.26]:54283 "EHLO exprod5og113.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758928Ab1DPKCl (ORCPT ); Sat, 16 Apr 2011 06:02:41 -0400 Received: from DE01MGRG01.AM.MOT-MOBILITY.COM ([10.176.129.42]) by DE01MGRG01.AM.MOT-MOBILITY.COM (8.14.3/8.14.3) with ESMTP id p3GA33nq006183 for ; Sat, 16 Apr 2011 06:03:04 -0400 (EDT) Received: from mail-gx0-f170.google.com (mail-gx0-f170.google.com [209.85.161.170]) by DE01MGRG01.AM.MOT-MOBILITY.COM (8.14.3/8.14.3) with ESMTP id p3GA2scW006119 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=OK) for ; Sat, 16 Apr 2011 06:03:03 -0400 (EDT) Received: by mail-gx0-f170.google.com with SMTP id 27so2356747gxk.15 for ; Sat, 16 Apr 2011 03:02:39 -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: arindam.nath@amd.com, Andrei Warkentin , 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 | 70 ++++++++++++++++++++++++++++++++++----------- include/linux/mmc/sdhci.h | 1 + 2 files changed, 54 insertions(+), 17 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 94793f2..41c987d 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 (so no Auto-CMD12). + */ + if (!host->mrq->sbc && + host->flags & SDHCI_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) @@ -1140,7 +1163,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) #ifndef SDHCI_USE_LEDS_CLASS sdhci_activate_led(host); #endif - if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) { + + /* + * Ensure we don't send the STOP for non-SET_BLOCK_COUNTED + * requests if Auto-CMD12 is enabled. + */ + if (!mrq->sbc && (host->flags & SDHCI_ACMD12)) { if (mrq->stop) { mrq->data->stop = NULL; mrq->stop = NULL; @@ -1159,8 +1187,13 @@ 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 +1942,10 @@ 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; + + if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) + host->flags |= SDHCI_ACMD12; /* * A controller may support 8-bit width, but the board itself diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h index 83bd9f7..c54ac14 100644 --- a/include/linux/mmc/sdhci.h +++ b/include/linux/mmc/sdhci.h @@ -109,6 +109,7 @@ struct sdhci_host { #define SDHCI_USE_ADMA (1<<1) /* Host is ADMA capable */ #define SDHCI_REQ_USE_DMA (1<<2) /* Use DMA for this req. */ #define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */ +#define SDHCI_ACMD12 (1<<4) /* Auto CMD12 support */ unsigned int version; /* SDHCI spec. version */ -- 1.7.0.4