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From: Robert Jarzmik <robert.jarzmik@free.fr>
To: barebox@lists.infradead.org
Subject: [PATCH 4/5] arch/arm: mioa701 use maximum CPU frequency
Date: Tue, 15 May 2012 23:21:16 +0200	[thread overview]
Message-ID: <1337116877-17657-5-git-send-email-robert.jarzmik@free.fr> (raw)
In-Reply-To: <1337116877-17657-1-git-send-email-robert.jarzmik@free.fr>

To speed-up linux kernel loading, switch the PXA cpu to the
maximum allowed frequency (520 MHz). This improves the load
time from several seconds to less than a second from the
MTD.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
 arch/arm/boards/mioa701/board.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boards/mioa701/board.c b/arch/arm/boards/mioa701/board.c
index 14c8110..ab5a493 100644
--- a/arch/arm/boards/mioa701/board.c
+++ b/arch/arm/boards/mioa701/board.c
@@ -261,8 +261,17 @@ static int mioa701_coredevice_init(void)
 	/* route pins */
 	pxa2xx_mfp_config(ARRAY_AND_SIZE(mioa701_pin_config));
 
-	CCCR = CCCR_A | 0x20110;
-	cclk = 0x02;
+	/*
+	 * Put the board in superspeed (520 MHz) to speed-up logo/OS loading.
+	 * This requires to command the Maxim 1586 to upgrade core voltage to
+	 * 1.475 V, on the power I2C bus (device 0x14).
+	 */
+	CCCR = CCCR_A | 0x20290;
+	PCFR = PCFR_GPR_EN | PCFR_FVC | PCFR_DC_EN | PCFR_PI2C_EN | PCFR_OPDE;
+	PCMD(0) = PCMD_LC | 0x1f;
+	PVCR = 0x14;
+
+	cclk = 0x0b;
 	asm volatile("mcr p14, 0, %0, c6, c0, 0 @ set CCLK"
 	  : : "r" (cclk) : "cc");
 
-- 
1.7.10


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  parent reply	other threads:[~2012-05-15 21:21 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-15 21:21 [PATCH 0/5] arch/arm: mioa701 linux booting Robert Jarzmik
2012-05-15 21:21 ` [PATCH 1/5] arm/board: mioa701 align kernel options with kernel mtd Robert Jarzmik
2012-05-15 21:21 ` [PATCH 2/5] arch/arm: mioa701 make autoboot of Linux work Robert Jarzmik
2012-05-15 21:21 ` [PATCH 3/5] arch/arm: mioa701 add IPL and DPS1 updater Robert Jarzmik
2012-05-15 21:21 ` Robert Jarzmik [this message]
2012-05-15 21:21 ` [PATCH 5/5] arch/arm: mioa701 improve barebox_update script Robert Jarzmik
2012-05-16 17:22 ` [PATCH 0/5] arch/arm: mioa701 linux booting Sascha Hauer

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