[U-Boot] [PATCH] mx25: Clean up lowlevel_init

Tue Aug 14 23:25:38 CEST 2012

Clean up mx25 lowlevel_init:
 - Add comments.
 - Do not use write32 repeatedly with the same value in order no to increase
   code size.
 - Make register values configurable.
 - Use defined values instead of literal constants.
 - Use defined macros instead of duplicating code.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau at advansee.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 .../arch/arm/include/asm/arch-mx25/macro.h         |   57 +++++++++++++-------
 .../board/karo/tx25/lowlevel_init.S                |   37 +++----------
 .../board/syteco/zmx25/lowlevel_init.S             |    6 +++
 3 files changed, 51 insertions(+), 49 deletions(-)

diff --git u-boot-4d3c95f.orig/arch/arm/include/asm/arch-mx25/macro.h u-boot-4d3c95f/arch/arm/include/asm/arch-mx25/macro.h
index 3b694da..9550ade 100644
--- u-boot-4d3c95f.orig/arch/arm/include/asm/arch-mx25/macro.h
+++ u-boot-4d3c95f/arch/arm/include/asm/arch-mx25/macro.h
@@ -32,32 +32,49 @@
 
 #include <asm/arch/imx-regs.h>
 #include <generated/asm-offsets.h>
+#include <asm/macro.h>
 
+/*
+ * AIPS setup - Only setup MPROTx registers.
+ * The PACR default values are good.
+ */
 .macro init_aips
-	write32	IMX_AIPS1_BASE + AIPS_MPR_0_7, 0x77777777
-	write32	IMX_AIPS1_BASE + AIPS_MPR_8_15, 0x77777777
-	write32	IMX_AIPS2_BASE + AIPS_MPR_0_7, 0x77777777
-	write32	IMX_AIPS2_BASE + AIPS_MPR_8_15, 0x77777777
+	ldr	r0, =IMX_AIPS1_BASE
+	ldr	r1, =AIPS_MPR_CONFIG
+	str	r1, [r0, #AIPS_MPR_0_7]
+	str	r1, [r0, #AIPS_MPR_8_15]
+	ldr	r2, =IMX_AIPS2_BASE
+	str	r1, [r2, #AIPS_MPR_0_7]
+	str	r1, [r2, #AIPS_MPR_8_15]
 .endm
 
+/* MAX (Multi-Layer AHB Crossbar Switch) setup */
 .macro init_max
-	write32	IMX_MAX_BASE + MAX_MPR0, 0x43210
-	write32	IMX_MAX_BASE + MAX_MPR1, 0x43210
-	write32	IMX_MAX_BASE + MAX_MPR2, 0x43210
-	write32	IMX_MAX_BASE + MAX_MPR3, 0x43210
-	write32	IMX_MAX_BASE + MAX_MPR4, 0x43210
-
-	write32	IMX_MAX_BASE + MAX_SGPCR0, 0x10
-	write32	IMX_MAX_BASE + MAX_SGPCR1, 0x10
-	write32	IMX_MAX_BASE + MAX_SGPCR2, 0x10
-	write32	IMX_MAX_BASE + MAX_SGPCR3, 0x10
-	write32	IMX_MAX_BASE + MAX_SGPCR4, 0x10
+	ldr	r0, =IMX_MAX_BASE
+	ldr	r1, =MAX_MPR_CONFIG
+	str	r1, [r0, #MAX_MPR0]	/* for S0 */
+	str	r1, [r0, #MAX_MPR1]	/* for S1 */
+	str	r1, [r0, #MAX_MPR2]	/* for S2 */
+	str	r1, [r0, #MAX_MPR3]	/* for S3 */
+	str	r1, [r0, #MAX_MPR4]	/* for S4 */
+	ldr	r1, =MAX_SGPCR_CONFIG
+	str	r1, [r0, #MAX_SGPCR0]	/* for S0 */
+	str	r1, [r0, #MAX_SGPCR1]	/* for S1 */
+	str	r1, [r0, #MAX_SGPCR2]	/* for S2 */
+	str	r1, [r0, #MAX_SGPCR3]	/* for S3 */
+	str	r1, [r0, #MAX_SGPCR4]	/* for S4 */
+	ldr	r1, =MAX_MGPCR_CONFIG
+	str	r1, [r0, #MAX_MGPCR0]	/* for M0 */
+	str	r1, [r0, #MAX_MGPCR1]	/* for M1 */
+	str	r1, [r0, #MAX_MGPCR2]	/* for M2 */
+	str	r1, [r0, #MAX_MGPCR3]	/* for M3 */
+	str	r1, [r0, #MAX_MGPCR4]	/* for M4 */
+.endm
 
-	write32	IMX_MAX_BASE + MAX_MGPCR0, 0x0
-	write32	IMX_MAX_BASE + MAX_MGPCR1, 0x0
-	write32	IMX_MAX_BASE + MAX_MGPCR2, 0x0
-	write32	IMX_MAX_BASE + MAX_MGPCR3, 0x0
-	write32	IMX_MAX_BASE + MAX_MGPCR4, 0x0
+/* M3IF setup */
+.macro init_m3if
+	/* M3IF Control Register (M3IFCTL) */
+	write32	IMX_M3IF_CTRL_BASE, M3IFCTL_CONFIG
 .endm
 
 #endif /* __ASSEMBLY__ */
diff --git u-boot-4d3c95f.orig/board/karo/tx25/lowlevel_init.S u-boot-4d3c95f/board/karo/tx25/lowlevel_init.S
index 823df10..cdd9bda 100644
--- u-boot-4d3c95f.orig/board/karo/tx25/lowlevel_init.S
+++ u-boot-4d3c95f/board/karo/tx25/lowlevel_init.S
@@ -23,36 +23,13 @@
 
 #include <asm/macro.h>
 
-.macro init_aips
-	write32	0x43f00000, 0x77777777
-	write32	0x43f00004, 0x77777777
-	write32	0x43f00000, 0x77777777
-	write32	0x53f00004, 0x77777777
-.endm
+#define AIPS_MPR_CONFIG		0x77777777
+#define MAX_MPR_CONFIG		0x43210
+#define MAX_SGPCR_CONFIG	0x10
+#define MAX_MGPCR_CONFIG	0x0
+#define M3IFCTL_CONFIG		0x1
 
-.macro init_max
-	write32	0x43f04000, 0x43210
-	write32	0x43f04100, 0x43210
-	write32	0x43f04200, 0x43210
-	write32	0x43f04300, 0x43210
-	write32	0x43f04400, 0x43210
-
-	write32	0x43f04010, 0x10
-	write32	0x43f04110, 0x10
-	write32	0x43f04210, 0x10
-	write32	0x43f04310, 0x10
-	write32	0x43f04410, 0x10
-
-	write32	0x43f04800, 0x0
-	write32	0x43f04900, 0x0
-	write32	0x43f04a00, 0x0
-	write32	0x43f04b00, 0x0
-	write32	0x43f04c00, 0x0
-.endm
-
-.macro init_m3if
-	write32 0xb8003000, 0x1
-.endm
+#include <asm/arch/macro.h>
 
 .macro init_clocks
 	/*
@@ -64,6 +41,8 @@
 	 * 0x00600000 makes CLKO parent clk the USB clk
 	 */
 	write32	0x53f80064, 0x45600000
+
+	/* CCTL: ARM = 399 MHz, AHB = 133 MHz */
 	write32	0x53f80008, 0x20034000
 
 	/*
diff --git u-boot-4d3c95f.orig/board/syteco/zmx25/lowlevel_init.S u-boot-4d3c95f/board/syteco/zmx25/lowlevel_init.S
index 1002674..575755c 100644
--- u-boot-4d3c95f.orig/board/syteco/zmx25/lowlevel_init.S
+++ u-boot-4d3c95f/board/syteco/zmx25/lowlevel_init.S
@@ -25,6 +25,12 @@
  */
 
 #include <asm/macro.h>
+
+#define AIPS_MPR_CONFIG		0x77777777
+#define MAX_MPR_CONFIG		0x43210
+#define MAX_SGPCR_CONFIG	0x10
+#define MAX_MGPCR_CONFIG	0x0
+
 #include <asm/arch/macro.h>
 #include <asm/arch/imx-regs.h>
 #include <generated/asm-offsets.h>
