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From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 06/14] ppc mpc5200: add function to setup bus clocks
Date: Tue, 27 Sep 2011 10:28:21 +0200	[thread overview]
Message-ID: <1317112109-23311-7-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1317112109-23311-1-git-send-email-s.hauer@pengutronix.de>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 arch/ppc/mach-mpc5xxx/cpu.c                  |   38 ++++++++++++++++++++++++++
 arch/ppc/mach-mpc5xxx/include/mach/mpc5xxx.h |    3 ++
 2 files changed, 41 insertions(+), 0 deletions(-)

diff --git a/arch/ppc/mach-mpc5xxx/cpu.c b/arch/ppc/mach-mpc5xxx/cpu.c
index 649f08a..d695b9b 100644
--- a/arch/ppc/mach-mpc5xxx/cpu.c
+++ b/arch/ppc/mach-mpc5xxx/cpu.c
@@ -33,6 +33,7 @@
 #include <asm/io.h>
 #include <init.h>
 #include <types.h>
+#include <errno.h>
 #include <mach/clocks.h>
 
 #if defined(CONFIG_OF_FLAT_TREE)
@@ -132,6 +133,43 @@ unsigned long mpc5200_get_sdram_size(unsigned int cs)
 	return size;
 }
 
+int mpc5200_setup_bus_clocks(unsigned int ipbdiv, unsigned long pcidiv)
+{
+	u32 cdmcfg = *(vu_long *)MPC5XXX_CDM_CFG;
+
+	cdmcfg &= ~0x103;
+
+	switch (ipbdiv) {
+	case 1:
+		break;
+	case 2:
+		cdmcfg |= 0x100;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (pcidiv) {
+	case 1:
+		if (ipbdiv == 2)
+			return -EINVAL;
+		break;
+	case 2:
+		if (ipbdiv == 1)
+			cdmcfg |= 0x1; /* ipb / 2 */
+		break;
+	case 4:
+		cdmcfg |= 0x2; /* xlb / 4 */
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	*(vu_long *)MPC5XXX_CDM_CFG = cdmcfg;
+
+	return 0;
+}
+
 struct mpc5200_cs {
 	void *start;
 	void *stop;
diff --git a/arch/ppc/mach-mpc5xxx/include/mach/mpc5xxx.h b/arch/ppc/mach-mpc5xxx/include/mach/mpc5xxx.h
index 558f331..8e95dd0 100644
--- a/arch/ppc/mach-mpc5xxx/include/mach/mpc5xxx.h
+++ b/arch/ppc/mach-mpc5xxx/include/mach/mpc5xxx.h
@@ -786,6 +786,9 @@ unsigned long mpc5200_get_sdram_size(unsigned int cs);
 #define MPC5200_BOOTCS 8
 void mpc5200_setup_cs(int cs, unsigned long start, unsigned long size, u32 cfg);
 
+/* configure bus speeds. Both dividers are relative to xlb clock */
+int mpc5200_setup_bus_clocks(unsigned int ipbdiv, unsigned long pcidiv);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASMPPC_MPC5XXX_H */
-- 
1.7.6.3


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  parent reply	other threads:[~2011-09-27  8:28 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-27  8:28 more ppc and pcm030 cleanup Sascha Hauer
2011-09-27  8:28 ` [PATCH 01/14] ppc: remove mgt5100 support from code Sascha Hauer
2011-09-27  8:28 ` [PATCH 02/14] ppc: add a get_pc() function Sascha Hauer
2011-09-27  8:28 ` [PATCH 03/14] remove EARLY_INIT and EARLY_CONSOLE support Sascha Hauer
2011-09-27  8:28 ` [PATCH 04/14] ppc mpc5200: add function to determine configured sdram size Sascha Hauer
2011-09-27  8:28 ` [PATCH 05/14] ppc mpc5200: add function to configure a chipselect Sascha Hauer
2011-09-27  8:28 ` Sascha Hauer [this message]
2011-09-27  8:28 ` [PATCH 07/14] ppc mpc5200b: cleanup lowlevel startup Sascha Hauer
2011-09-27  8:28 ` [PATCH 08/14] pcm030: use new functionality Sascha Hauer
2011-09-27  8:28 ` [PATCH 09/14] ppc: hardcode sdram base to 0x0 Sascha Hauer
2011-09-27  8:28 ` [PATCH 10/14] mpc5200: hardcode MBAR to 0xf0000000 Sascha Hauer
2011-09-27  8:28 ` [PATCH 11/14] mpc5200: hardcode internal sram for initram Sascha Hauer
2011-09-27  8:28 ` [PATCH 12/14] pcm030: fix /dev/self0 and /dev/env0 Sascha Hauer
2011-09-27  8:28 ` [PATCH 13/14] ppc mpc5200: remove bus clock switching from generic code Sascha Hauer
2011-09-27  8:28 ` [PATCH 14/14] pcm030: cleanup config.h Sascha Hauer

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