linux-kernel - [PATCH 01/13] mmc: bcm2835: add bcm2835_read_wait

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Date:   Fri, 27 Jan 2017 00:37:14 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     linux-rpi-kernel@...ts.infradead.org
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Eric Anholt <eric@...olt.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, Gerd Hoffmann <kraxel@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM
        BCM281XX/BCM11XXX/BCM216XX ARM ARCHITE...),
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>,
        linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM BCM2835
        ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 01/13] mmc: bcm2835: add bcm2835_read_wait_sdcmd

Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
---
 drivers/mmc/host/bcm2835.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/mmc/host/bcm2835.c b/drivers/mmc/host/bcm2835.c
index 9744517..ceee4cf 100644
--- a/drivers/mmc/host/bcm2835.c
+++ b/drivers/mmc/host/bcm2835.c
@@ -609,6 +609,36 @@ static void bcm2835_prepare_data(struct bcm2835_host *host,
 	writel(data->blocks, host->ioaddr + SDHBLC);
 }
 
+static u32 bcm2835_read_wait_sdcmd(struct bcm2835_host *host, u32 timeout,
+				   bool check_fail)
+{
+	struct device *dev = &host->pdev->dev;
+	unsigned long start = jiffies;
+	unsigned long fastpoll = start + usecs_to_jiffies(10);
+	unsigned long end = start + msecs_to_jiffies(timeout);
+	u32 value;
+
+	for (;;) {
+		value = readl(host->ioaddr + SDCMD);
+		if (!(value & SDCMD_NEW_FLAG))
+			break;
+		if (check_fail && (value & SDCMD_FAIL_FLAG))
+			break;
+		if (time_after(jiffies, end)) {
+			dev_err(dev, "%s: timeout (%d us)\n",
+				__func__, timeout);
+			break;
+		}
+
+		/* if it takes longer reduce poll interval */
+		if (time_after(jiffies, fastpoll))
+			udelay(10);
+		else
+			cpu_relax();
+	}
+	return value;
+}
+
 bool bcm2835_send_command(struct bcm2835_host *host,
 			  struct mmc_command *cmd)
 {
-- 
1.8.3.1