From patchwork Sun May 17 00:28:26 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Hutchings X-Patchwork-Id: 473102 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 56B2814012C for ; Sun, 17 May 2015 10:28:31 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751379AbbEQA2a (ORCPT ); Sat, 16 May 2015 20:28:30 -0400 Received: from ducie-dc1.codethink.co.uk ([185.25.241.215]:47189 "EHLO ducie-dc1.codethink.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751293AbbEQA2a (ORCPT ); Sat, 16 May 2015 20:28:30 -0400 Received: from localhost (localhost [127.0.0.1]) by ducie-dc1.codethink.co.uk (Postfix) with ESMTP id ECAF34617A6; Sun, 17 May 2015 01:28:28 +0100 (BST) X-Virus-Scanned: Debian amavisd-new at ducie-dc1.codethink.co.uk Received: from ducie-dc1.codethink.co.uk ([127.0.0.1]) by localhost (ducie-dc1.codethink.co.uk [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ftUANbrG0PVE; Sun, 17 May 2015 01:28:28 +0100 (BST) Received: from [192.168.25.61] (unknown [192.168.25.61]) by ducie-dc1.codethink.co.uk (Postfix) with ESMTPSA id 2DD64461721; Sun, 17 May 2015 01:28:28 +0100 (BST) Message-ID: <1431822506.4222.168.camel@xylophone.i.decadent.org.uk> Subject: [PATCH 1/6] mmc: tmio: Add UHS-I mode support From: Ben Hutchings To: Ian Molton , linux-mmc@vger.kernel.org Cc: linux-sh@vger.kernel.org, linux-gpio@vger.kernel.org, linux-kernel@lists.codethink.co.uk, Sergei Shtylyov , Simon Horman Date: Sun, 17 May 2015 01:28:26 +0100 In-Reply-To: <1431822459.4222.166.camel@xylophone.i.decadent.org.uk> References: <1431822459.4222.166.camel@xylophone.i.decadent.org.uk> Organization: Codethink Ltd. X-Mailer: Evolution 3.4.4-3 Mime-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Based on work by Shinobu Uehara and Ben Dooks. This adds the voltage switch operation needed for all UHS-I modes, but not the tuning needed for SDR-104 which will come later. XXX The card_busy implementation is a bit of a guess. Signed-off-by: Ben Hutchings --- drivers/mmc/host/tmio_mmc.h | 3 +++ drivers/mmc/host/tmio_mmc_pio.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index 4a597f5a53e2..a1a009879946 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -99,6 +99,9 @@ struct tmio_mmc_host { void (*clk_disable)(struct platform_device *pdev); int (*multi_io_quirk)(struct mmc_card *card, unsigned int direction, int blk_size); + + int (*start_signal_voltage_switch)(struct tmio_mmc_host *host, + unsigned char signal_voltage); }; struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev); diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index e3dcf31a8bd6..3c1e0e53c0b1 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -1011,12 +1011,43 @@ static int tmio_multi_io_quirk(struct mmc_card *card, return blk_size; } +static int tmio_mmc_start_signal_voltage_switch(struct mmc_host *mmc, + struct mmc_ios *ios) +{ + struct tmio_mmc_host *host = mmc_priv(mmc); + + if (!host->start_signal_voltage_switch) + return 0; + + return host->start_signal_voltage_switch(host, ios->signal_voltage); +} + +static int tmio_mmc_card_busy(struct mmc_host *mmc) +{ + struct tmio_mmc_host *host = mmc_priv(mmc); + u32 status; + + pm_runtime_get_sync(mmc_dev(mmc)); + status = sd_ctrl_read32(host, CTL_STATUS); + pm_runtime_mark_last_busy(mmc_dev(mmc)); + pm_runtime_put_autosuspend(mmc_dev(mmc)); + + /* + * Card signals busy by pulling down all of DAT[3:0]. This status + * flag appears to reflect DAT3. + */ + return !(status & TMIO_STAT_SIGSTATE_A); +} + static const struct mmc_host_ops tmio_mmc_ops = { .request = tmio_mmc_request, .set_ios = tmio_mmc_set_ios, .get_ro = tmio_mmc_get_ro, .get_cd = mmc_gpio_get_cd, .enable_sdio_irq = tmio_mmc_enable_sdio_irq, + .start_signal_voltage_switch + = tmio_mmc_start_signal_voltage_switch, + .card_busy = tmio_mmc_card_busy, .multi_io_quirk = tmio_multi_io_quirk, };