From patchwork Sun Dec 5 19:10:08 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nishad Kamdar X-Patchwork-Id: 12657241 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8F4A0C433EF for ; Sun, 5 Dec 2021 19:10:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237731AbhLETOY (ORCPT ); Sun, 5 Dec 2021 14:14:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232195AbhLETOX (ORCPT ); Sun, 5 Dec 2021 14:14:23 -0500 Received: from mail-pg1-x52d.google.com (mail-pg1-x52d.google.com [IPv6:2607:f8b0:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9820DC061714; Sun, 5 Dec 2021 11:10:56 -0800 (PST) Received: by mail-pg1-x52d.google.com with SMTP id 133so8365524pgc.12; Sun, 05 Dec 2021 11:10:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id; bh=7PKgcD6CRCuYFewb9iDJgPShfY4HlviRqF3QruuqdzA=; b=qfIwd3xDhzKU0oh3atB+ZSXfCDuF7515eeR7AmkbLjsNQIyrkrwn8LbtT9GqoZaA6t KVuusEqUvYJwxPvftL85ChNLYpwO9hYhQhm+Oog2X0M73Pj/+4IWqnVErXYtMl9/UDZD ELC4Xe8+WnhIqCbuossb7tfZfYoUKM5h5KSFxZIbF6/u4ZkKGrOIWMuF4zP/lO0gOBeC KoI3Y/lZjah04JQu4dMze6L38D4fVmiDheI9Jc331a3csP86O3qN4piGI46Rxee6s0wh 6T02e6X1D3+Dz11SMe3QoghMvojjwC1I+DVONOjUOstfVSWjmRu3VUD+c4yARob0Gv6v Mylg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=7PKgcD6CRCuYFewb9iDJgPShfY4HlviRqF3QruuqdzA=; b=am8RkJ9Uw1t0cPOfgct2SFRXBMOeCA9QGj6tzOGrPerpzGVM+qPttZOGq+VGmtcxOq rwxpvyU2DbBJ5fqTYJ6OKMdU1rK0mS9zCVjbhvsGUKD5SpBO1JWVaV/QWUZVfg1wpJ2K CV62JhdUBzB/N5wEF2o0ijemEGahGtLgU1zUWiZLSMuudevydXt/MpXMoP30u1rH7RUK Imw6SzUEASSdRVtP85UzGHKAHwZZm4BhvLvs/wxYSXOZcJUdNw9uGaYWYAB+S1gI8AMF Xj+o638Fq87Ww+/XQ/eefWxG0wb16K13U6mwwrBJWfMyYJSXQabuJK7nIvUrCA2svwfF wALA== X-Gm-Message-State: AOAM533GDc71BqKajwYjLNxMlsb7+sCrMicf6f4iNT5PiobUEZWtU0o+ 0VD+l/MSduqstUJP7s11aNFqfDDT8AXdTdUQHkQ= X-Google-Smtp-Source: ABdhPJxkWomqIVIog9yiMR7bm0QA1Ot51gkjyKc2c+3MHOQJpj6lt3TxALWaZS79ERgAAc36BtTxww== X-Received: by 2002:a05:6a00:10d2:b0:4a8:3613:c475 with SMTP id d18-20020a056a0010d200b004a83613c475mr32327924pfu.0.1638731456032; Sun, 05 Dec 2021 11:10:56 -0800 (PST) Received: from localhost.localdomain ([49.207.207.227]) by smtp.gmail.com with ESMTPSA id t7sm10720797pjs.45.2021.12.05.11.10.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 05 Dec 2021 11:10:55 -0800 (PST) From: Nishad Kamdar To: Ulf Hansson , Jens Axboe , Adrian Hunter , Bean Huo , Shawn Lin , Avri Altman , Stephen Boyd , Huijin Park , Yue Hu , Wolfram Sang Cc: Nishad Kamdar , Greg Kroah-Hartman , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] mmc: core: Add support for the eMMC RTC feature in mmc_ops Date: Mon, 6 Dec 2021 00:40:08 +0530 Message-Id: <20211205191009.32454-1-nishadkamdar@gmail.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org This patch adds support to set the RTC information in the eMMC device. This is based on the JEDEC specification. There is no way however, to read the RTC time from the device. Hence we rely on the response of the CMD49 to confirm the completion of the operation. This patch has been tested successfully with the ioctl interface. This patch has also been tested suceessfully with all the three RTC_INFO_TYPEs. Signed-off-by: Nishad Kamdar Signed-off-by: Nishad Kamdar --- drivers/mmc/core/mmc_ops.c | 59 ++++++++++++++++++++++++++++++++++++++ drivers/mmc/core/mmc_ops.h | 2 ++ include/linux/mmc/mmc.h | 1 + 3 files changed, 62 insertions(+) diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index d63d1c735335..490372341b3b 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -1063,3 +1063,62 @@ int mmc_sanitize(struct mmc_card *card, unsigned int timeout_ms) return err; } EXPORT_SYMBOL_GPL(mmc_sanitize); + +int mmc_set_time(struct mmc_card *card, struct mmc_host *host, + u8 rtc_info_type, u64 seconds) +{ + struct mmc_request mrq = {}; + struct mmc_command cmd = {}; + struct mmc_data data = {}; + struct scatterlist sg; + int err = 0; + u8 *data_buf; + + data_buf = kzalloc(512, GFP_KERNEL); + if (!data_buf) + return -ENOMEM; + + if (rtc_info_type == 0x01 || rtc_info_type == 0x02 || + rtc_info_type == 0x03) { + data_buf[0] = 0x01; + data_buf[1] = rtc_info_type; + memcpy(&data_buf[2], &seconds, sizeof(u64)); + } else { + pr_err("%s: invalid rtc_info_type %d\n", + mmc_hostname(host), rtc_info_type); + kfree(data_buf); + return -EINVAL; + } + + mrq.cmd = &cmd; + mrq.data = &data; + + cmd.opcode = MMC_SET_TIME; + cmd.arg = 0; + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; + + data.blksz = 512; + data.blocks = 1; + data.flags = MMC_DATA_WRITE; + data.sg = &sg; + data.sg_len = 1; + sg_init_one(&sg, data_buf, 512); + + mmc_set_data_timeout(&data, card); + + mmc_wait_for_req(host, &mrq); + + if (cmd.error) { + err = cmd.error; + goto out; + } + + if (data.error) { + err = data.error; + goto out; + } +out: + kfree(data_buf); + return err; +} +EXPORT_SYMBOL_GPL(mmc_set_time); diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h index 9c813b851d0b..0c8695d1b363 100644 --- a/drivers/mmc/core/mmc_ops.h +++ b/drivers/mmc/core/mmc_ops.h @@ -55,6 +55,8 @@ void mmc_run_bkops(struct mmc_card *card); int mmc_cmdq_enable(struct mmc_card *card); int mmc_cmdq_disable(struct mmc_card *card); int mmc_sanitize(struct mmc_card *card, unsigned int timeout_ms); +int mmc_set_time(struct mmc_card *card, struct mmc_host *host, + u8 rtc_info_type, u64 seconds); #endif diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h index d9a65c6a8816..52a3bf873d50 100644 --- a/include/linux/mmc/mmc.h +++ b/include/linux/mmc/mmc.h @@ -64,6 +64,7 @@ #define MMC_WRITE_MULTIPLE_BLOCK 25 /* adtc R1 */ #define MMC_PROGRAM_CID 26 /* adtc R1 */ #define MMC_PROGRAM_CSD 27 /* adtc R1 */ +#define MMC_SET_TIME 49 /* adtc R1 */ /* class 6 */ #define MMC_SET_WRITE_PROT 28 /* ac [31:0] data addr R1b */