Forgot to add files to zylonite branch.

1 files changed, 266 insertions, 0 deletions

diff --git a/board/zylonite/lowlevel_init.S b/board/zylonite/lowlevel_init.S
new file mode 100644
index 0000000..54c2adf
--- /dev/null
+++ b/board/zylonite/lowlevel_init.S
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+/*
+ * Most of this taken from Redboot hal_platform_setup.h with cleanup
+ *
+ * NOTE: I haven't clean this up considerably, just enough to get it
+ * running. See hal_platform_setup.h for the source. See
+ * board/cradle/lowlevel_init.S for another PXA250 setup that is
+ * much cleaner.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <version.h>
+#include <asm/arch/pxa-regs.h>
+
+DRAM_SIZE:  .long   CFG_DRAM_SIZE
+
+/* wait for coprocessor write complete */
+   .macro CPWAIT reg
+   mrc  p15,0,\reg,c2,c0,0
+   mov  \reg,\reg
+   sub  pc,pc,#4
+   .endm
+
+
+/*
+ * 	Memory setup
+ */
+
+.globl lowlevel_init
+lowlevel_init:
+	/* Set up GPIO pins first ----------------------------------------- */
+	mov      r10, lr
+	
+        /*  GPIO41, 42, 43, 44, 45, 46, 47, 48 */
+	ldr             r0, =0x40E10438 @ GPIO41 FFRXD
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E1043C @ GPIO42 FFTXD
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E10440 @ GPIO43 FFCTS
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E10444 @ GPIO 44 FFDCD
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E10448 @ GPIO 45 FFDSR
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E1044C @ GPIO 46 FFRI
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E10450 @ GPIO 47 FFDTR
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+	ldr             r0, =0x40E10454 @ GPIO 48
+	ldr             r1, =0x802
+	str             r1, [r0]
+
+        /* tebrandt - ASCR, clear the RDH bit */
+	ldr             r0, =ASCR
+	ldr             r1, [r0]
+	bic             r1, r1, #0x80000000
+	str             r1, [r0]
+	
+	/* ---------------------------------------------------------------- */
+	/* Enable memory interface                                          */
+	/*                                                                  */
+	/* The sequence below is based on the recommended init steps        */
+	/* detailed in the Intel PXA250 Operating Systems Developers Guide, */
+	/* Chapter 10.                                                      */
+	/* ---------------------------------------------------------------- */
+
+	/* ---------------------------------------------------------------- */
+	/* Step 1: Wait for at least 200 microsedonds to allow internal     */
+	/*         clocks to settle. Only necessary after hard reset...     */
+	/*         FIXME: can be optimized later                            */
+	/* ---------------------------------------------------------------- */
+
+	ldr r3, =OSCR			/* reset the OS Timer Count to zero */
+	mov r2, #0
+	str r2, [r3]
+	ldr r4, =0x300			/* really 0x2E1 is about 200usec,   */
+					/* so 0x300 should be plenty        */
+1:
+	ldr r2, [r3]
+	cmp r4, r2
+	bgt 1b
+
+mem_init:
+
+	/* configure the MEMCLKCFG register */
+        ldr             r1, =MEMCLKCFG
+        ldr             r2, =0x00010001
+        str             r2, [r1]             @ WRITE
+        ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+        
+	/* set CSADRCFG[0] to data flash SRAM mode */
+	ldr             r1, =CSADRCFG0
+	ldr             r2, =0x00320809
+	str             r2, [r1]             @ WRITE
+	ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+        
+	/* set CSADRCFG[1] to data flash SRAM mode */
+	ldr             r1, =CSADRCFG1
+	ldr             r2, =0x00320809
+	str             r2, [r1]             @ WRITE
+	ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+        
+	/* set MSC 0 register for SRAM memory */
+        ldr             r1, =MSC0
+        ldr             r2, =0x11191119
+        str             r2, [r1]             @ WRITE
+        ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+         
+	/* set CSADRCFG[2] to data flash SRAM mode */
+	ldr             r1, =CSADRCFG2
+	ldr             r2, =0x00320809
+	str             r2, [r1]             @ WRITE
+	ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+        
+	/* set CSADRCFG[3] to VLIO mode */
+        ldr             r1, =CSADRCFG3
+        ldr             r2, =0x0032080B
+        str             r2, [r1]             @ WRITE
+        ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+
+	/* set MSC 1 register for VLIO memory */
+        ldr             r1, =MSC1
+        ldr             r2, =0x123C1119
+        str             r2, [r1]             @ WRITE
+        ldr             r2, [r1]             @ DELAY UNTIL WRITTEN
+
+#if 0
+	/* This does not work in Zylonite. -SC */
+	ldr		r0, =0x15fffff0
+	ldr		r1, =0xb10b
+	str		r1, [r0]
+	str		r1, [r0, #4]
+#endif
+
+	/* Configure ACCR Register */
+	ldr		r0, =ACCR		@ ACCR
+	ldr		r1, =0x0180b108
+	str		r1, [r0]
+	ldr		r1, [r0]
+
+	/* Configure MDCNFG Register */
+	ldr		r0, =MDCNFG		@ MDCNFG
+	ldr		r1, =0x403
+	str		r1, [r0]
+	ldr		r1, [r0]
+
+	/* Perform Resistive Compensation by configuring RCOMP register */
+	ldr		r1, =RCOMP		@ RCOMP
+	ldr		r2, =0x000000ff
+	str		r2, [r1]
+	ldr		r2, [r1]
+
+	/* Configure MDMRS Register for SDCS0 */
+	ldr		r1, =MDMRS		@ MDMRS
+	ldr		r2, =0x60000023
+	ldr		r3, [r1]
+	orr		r2, r2, r3
+	str		r2, [r1]
+	ldr		r2, [r1]
+
+	/* Configure MDMRS Register for SDCS1 */
+	ldr		r1, =MDMRS		@ MDMRS
+	ldr		r2, =0xa0000023
+	ldr		r3, [r1]
+	orr		r2, r2, r3
+	str		r2, [r1]
+	ldr		r2, [r1]
+
+	/* Configure MDREFR */
+	ldr		r1, =MDREFR		@ MDREFR
+	ldr		r2, =0x00000006
+	str		r2, [r1]
+	ldr		r2, [r1]
+
+	/* Configure EMPI */
+	ldr		r1, =EMPI		@ EMPI
+	ldr		r2, =0x80000000
+	str		r2, [r1]
+	ldr		r2, [r1]
+
+	/* DDR Read-Strobe Delay Calibration */
+	/* bl	ddr_calibration */
+
+	/* Here we assume the hardware calibration alwasy be successful. -SC */
+	/* Set DMCEN bit in MDCNFG Register */
+	ldr		r0, =MDCNFG		@ MDCNFG
+	ldr		r1, [r0]
+	orr		r1, r1, #0x40000000	@ enable SDRAM for Normal Access
+	str		r1, [r0]
+
+	/* scrub/init SDRAM if enabled/present */
+	ldr	r11, =0xa0000000 //RAM_BASE	// base address of SDRAM
+	ldr	r12, =0x04000000 // size of memory to scrub
+	mov	r8,r12		// save DRAM size
+	mov	r0, #0		// scrub with 0x0000:0000
+	mov	r1, #0
+	mov	r2, #0				
+	mov	r3, #0
+	mov	r4, #0					
+	mov	r5, #0
+	mov	r6, #0					
+	mov	r7, #0
+10:     /* fastScrubLoop */
+	subs	r12, r12, #32	// 32 bytes/line
+	stmia	r11!, {r0-r7}
+	beq	15f
+	b	10b
+
+15:
+	/* Mask all interrupts */
+	mov	r1, #0
+	mcr	p6, 0, r1, c1, c0, 0	@ ICMR
+
+	/* Disable software and data breakpoints */
+	mov	r0, #0
+	mcr	p15,0,r0,c14,c8,0  // ibcr0
+	mcr	p15,0,r0,c14,c9,0  // ibcr1
+	mcr	p15,0,r0,c14,c4,0  // dbcon
+
+	/* Enable all debug functionality */
+	mov	r0,#0x80000000
+	mcr	p14,0,r0,c10,c0,0  // dcsr
+
+
+	
+	/* We are finished with Intel's memory controller initialisation    */
+
+
+	/* ---------------------------------------------------------------- */
+	/* End lowlevel_init                                                     */
+	/* ---------------------------------------------------------------- */
+
+endlowlevel_init:
+
+    mov     pc, lr