linux-kernel - [PATCH v3 06/10] mmc: mediatek: add implement of ops->hw

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Date:	Tue, 27 Oct 2015 14:24:26 +0800
From:	Chaotian Jing <chaotian.jing@...iatek.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	<linux-mediatek@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Seungwon Jeon <tgih.jun@...sung.com>,
	Jaehoon Chung <jh80.chung@...sung.com>,
	Kukjin Kim <kgene@...nel.org>,
	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Barry Song <baohua@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Howard Chen <ibanezchen@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kristina Martsenko <kristina.martsenko@...il.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Minda Chen <Minda.Chen@....com>,
	Dong Aisheng <b29396@...escale.com>,
	Johan Derycke <johan.derycke@...co.com>,
	Haibo Chen <haibo.chen@...escale.com>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Georgi Djakov <georgi.djakov@...aro.org>,
	<ivan.ivanov@...aro.org>, Weijun Yang <Weijun.Yang@....com>,
	Kevin Hao <haokexin@...il.com>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mmc@...r.kernel.org>, <linux-samsung-soc@...r.kernel.org>,
	<srv_heupstream@...iatek.com>
Subject: [PATCH v3 06/10] mmc: mediatek: add implement of ops->hw_reset()

add implement of ops->hw_reset() for eMMC

Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>

---
 drivers/mmc/host/mtk-sd.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 3858163..5627644 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -64,6 +64,7 @@
 #define SDC_RESP2        0x48
 #define SDC_RESP3        0x4c
 #define SDC_BLK_NUM      0x50
+#define EMMC_IOCON       0x7c
 #define SDC_ACMD_RESP    0x80
 #define MSDC_DMA_SA      0x90
 #define MSDC_DMA_CTRL    0x98
@@ -1209,6 +1210,15 @@ end:
 	pm_runtime_put_autosuspend(host->dev);
 }
 
+static void msdc_hw_reset(struct mmc_host *mmc)
+{
+	struct msdc_host *host = mmc_priv(mmc);
+
+	sdr_set_bits(host->base + EMMC_IOCON, 1);
+	udelay(10); /* 10us is enough */
+	sdr_clr_bits(host->base + EMMC_IOCON, 1);
+}
+
 static struct mmc_host_ops mt_msdc_ops = {
 	.post_req = msdc_post_req,
 	.pre_req = msdc_pre_req,
@@ -1216,6 +1226,7 @@ static struct mmc_host_ops mt_msdc_ops = {
 	.set_ios = msdc_ops_set_ios,
 	.start_signal_voltage_switch = msdc_ops_switch_volt,
 	.card_busy = msdc_card_busy,
+	.hw_reset = msdc_hw_reset,
 };
 
 static int msdc_drv_probe(struct platform_device *pdev)
-- 
1.8.1.1.dirty

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