Patchwork [U-Boot,2/2,v1] integrator: enable Vpp and disable flash protection

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Submitter Linus Walleij
Date Oct. 5, 2011, 9:21 p.m.
Message ID <1317849666-22815-1-git-send-email-linus.walleij@linaro.org>
Download mbox | patch
Permalink /patch/117925/
State Accepted
Commit 1dc26801a3ef15ea2d32387c725293ecfcb08efa
Delegated to: Albert ARIBAUD
Headers show

Comments

Linus Walleij - Oct. 5, 2011, 9:21 p.m.
This enables Vpp and disables the flash protection on the
Integrator when starting U-Boot. The integrator/AP has double
protection mechanisms: this one and the EBI protection bit
(patch earlier), the Integrator/CP has only one line of
protection in these registers.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 board/armltd/integrator/integrator.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

Patch

diff --git a/board/armltd/integrator/integrator.c b/board/armltd/integrator/integrator.c
index dd83ca5..a507c09 100644
--- a/board/armltd/integrator/integrator.c
+++ b/board/armltd/integrator/integrator.c
@@ -37,6 +37,7 @@ 
 #include <netdev.h>
 #include <asm/io.h>
 #include "arm-ebi.h"
+#include "integrator-sc.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -76,7 +77,19 @@  extern void cm_remap(void);
 	cm_remap();	/* remaps writeable memory to 0x00000000 */
 #endif
 
+#ifdef CONFIG_ARCH_CINTEGRATOR
 	/*
+	 * Flash protection on the Integrator/CP is in a simple register
+	 */
+	val = readl(CP_FLASHPROG);
+	val |= (CP_FLASHPROG_FLVPPEN | CP_FLASHPROG_FLWREN);
+	writel(val, CP_FLASHPROG);
+#else
+	/*
+	 * The Integrator/AP has some special protection mechanisms
+	 * for the external memories, first the External Bus Interface (EBI)
+	 * then the system controller (SC).
+	 *
 	 * The system comes up with the flash memory non-writable and
 	 * configuration locked. If we want U-Boot to be used for flash
 	 * access we cannot have the flash memory locked.
@@ -88,6 +101,13 @@  extern void cm_remap(void);
 	writel(val, EBI_BASE + EBI_CSR1_REG);
 	writel(0, EBI_BASE + EBI_LOCK_REG);
 
+	/*
+	 * Set up the system controller to remove write protection from
+	 * the flash memory and enable Vpp
+	 */
+	writel(SC_CTRL_FLASHVPP | SC_CTRL_FLASHWP, SC_CTRLS);
+#endif
+
 	icache_enable ();
 
 	return 0;