From: "Teresa Gámez" <t.gamez@phytec.de>
To: s.hauer@pengutronix.de
Cc: barebox@lists.infradead.org
Subject: [PATCH] ARM pcm043: Check silicon revision to set up cpu freq correct
Date: Tue, 23 Aug 2011 14:30:27 +0200 [thread overview]
Message-ID: <1314102627-12837-1-git-send-email-t.gamez@phytec.de> (raw)
Some older pcm043 only work correct when cpu frequency is set up
to 399MHz. All modules with revision >= 1315.4 are equipped
with a i.MX35 TO2.1 and do run with 532MHz.
Check the silicon revision and set up the frequency accordingly.
Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
---
arch/arm/boards/pcm043/lowlevel.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/arch/arm/boards/pcm043/lowlevel.c b/arch/arm/boards/pcm043/lowlevel.c
index bbe586b..e488681 100644
--- a/arch/arm/boards/pcm043/lowlevel.c
+++ b/arch/arm/boards/pcm043/lowlevel.c
@@ -37,6 +37,11 @@
#define MPCTL_PARAM_532 ((1 << 31) | IMX_PLL_PD(0) | IMX_PLL_MFD(11) | IMX_PLL_MFI(11) | IMX_PLL_MFN(1))
#define PPCTL_PARAM_300 (IMX_PLL_PD(0) | IMX_PLL_MFD(3) | IMX_PLL_MFI(6) | IMX_PLL_MFN(1))
+#define IMX35_CHIP_REVISION_2_1 0x11
+
+#define CCM_PDR0_399 0x00011000
+#define CCM_PDR0_532 0x00001000
+
#ifdef CONFIG_NAND_IMX_BOOT
static void __bare_init __naked insdram(void)
{
@@ -111,7 +116,13 @@ void __bare_init __naked board_init_lowlevel(void)
writel(MPCTL_PARAM_532, ccm_base + CCM_MPCTL);
writel(PPCTL_PARAM_300, ccm_base + CCM_PPCTL);
- writel(0x00001000, ccm_base + CCM_PDR0);
+
+ /* Check silicon revision and use 532MHz if >=2.1 */
+ r = readl(IMX_IIM_BASE + 0x24);
+ if (r >= IMX35_CHIP_REVISION_2_1)
+ writel(CCM_PDR0_532, ccm_base + CCM_PDR0);
+ else
+ writel(CCM_PDR0_399, ccm_base + CCM_PDR0);
r = readl(ccm_base + CCM_CGR0);
r |= 0x00300000;
--
1.7.0.4
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next reply other threads:[~2011-08-23 12:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-23 12:30 Teresa Gámez [this message]
2011-08-23 12:45 ` Sascha Hauer
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