From: Juergen Beisert <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 02/14] Add macro for correct rounding in integer devisions
Date: Mon, 13 Dec 2010 11:53:25 +0100 [thread overview]
Message-ID: <1292237617-7064-3-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1292237617-7064-1-git-send-email-jbe@pengutronix.de>
Just stolen from Linux.
Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
drivers/mci/stm378x.c | 2 +-
include/common.h | 7 +++++++
2 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/mci/stm378x.c b/drivers/mci/stm378x.c
index 039fbb9..a2802af 100644
--- a/drivers/mci/stm378x.c
+++ b/drivers/mci/stm378x.c
@@ -484,7 +484,7 @@ static unsigned setup_clock_speed(struct device_d *hw_dev, unsigned nc)
ssp = imx_get_sspclk(0) * 1000;
for (div = 2; div < 255; div += 2) {
- rate = (((ssp + (nc >> 1) ) / nc) + (div >> 1)) / div;
+ rate = DIV_ROUND_CLOSEST(DIV_ROUND_CLOSEST(ssp, nc), div);
if (rate <= 0x100)
break;
}
diff --git a/include/common.h b/include/common.h
index be83a31..1bea10c 100644
--- a/include/common.h
+++ b/include/common.h
@@ -224,4 +224,11 @@ extern const char version_string[];
#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+#define DIV_ROUND_CLOSEST(x, divisor)( \
+{ \
+ typeof(divisor) __divisor = divisor; \
+ (((x) + ((__divisor) / 2)) / (__divisor)); \
+} \
+)
+
#endif /* __COMMON_H_ */
--
1.7.2.3
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next prev parent reply other threads:[~2010-12-13 10:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-13 10:53 [PATCH] i.MX28 architecture inclusion into barebox Juergen Beisert
2010-12-13 10:53 ` [PATCH 01/14] Make DIV_ROUND_UP macro globally available Juergen Beisert
2010-12-13 10:53 ` Juergen Beisert [this message]
2010-12-13 10:53 ` [PATCH 03/14] STM378x: Use Hz as the clock unit like in all other arch Juergen Beisert
2010-12-13 10:53 ` [PATCH 04/14] STM378x: Do not configure any pin usage in the driver Juergen Beisert
2010-12-13 10:53 ` [PATCH 05/14] STM378x: Parameterize the max. possible GPIO number Juergen Beisert
2010-12-13 10:53 ` [PATCH 06/14] STM378x: Separate i.MX23 clock handling Juergen Beisert
2010-12-13 10:53 ` [PATCH 07/14] IMX: Ignore i.MX23/i.MX28 related code in shared devices Juergen Beisert
2010-12-13 10:53 ` [PATCH 08/14] STM378x: Add i.MX28 architecture Juergen Beisert
2010-12-13 10:53 ` [PATCH 09/14] STM378x: Adapt the serial driver to support i.MX23 and i.MX28 Juergen Beisert
2010-12-13 10:53 ` [PATCH 10/14] STM378x: Adapt the MCI " Juergen Beisert
2010-12-13 10:53 ` [PATCH 11/14] Fixup the FEC driver files Juergen Beisert
2010-12-13 10:53 ` [PATCH 12/14] MX28: add FEC support Juergen Beisert
2010-12-13 10:53 ` [PATCH 13/14] STM378x: Add TX28 CPU module Juergen Beisert
2010-12-13 10:53 ` [PATCH 14/14] STM378x: Add the TX28 Starterkit-5 baseboard Juergen Beisert
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