Update make target for ARM supported boards.

Use lowlevel_init() instead of platformsetup() [rename].
Patch by Peter Pearse, 06 Oct 2005

1 files changed, 185 insertions, 0 deletions

diff --git a/board/omap2420h4/lowlevel_init.S b/board/omap2420h4/lowlevel_init.S
new file mode 100644
index 0000000..9752fc4
--- /dev/null
+++ b/board/omap2420h4/lowlevel_init.S
@@ -0,0 +1,185 @@
+/*
+ * Board specific setup info
+ *
+ * (C) Copyright 2004
+ * Texas Instruments, <www.ti.com>
+ * Richard Woodruff <r-woodruff2@ti.com>
+ *
+ * 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/omap2420.h>
+#include <asm/arch/mem.h>
+#include <asm/arch/clocks.h>
+
+_TEXT_BASE:
+	.word	TEXT_BASE	/* sdram load addr from config.mk */
+
+/**************************************************************************
+ * cpy_clk_code: relocates clock code into SRAM where its safer to execute
+ * R1 = SRAM destination address.
+ *************************************************************************/
+.global cpy_clk_code
+ cpy_clk_code:
+	/* Copy DPLL code into SRAM */
+	adr	r0, go_to_speed		/* get addr of clock setting code */
+	mov	r2, #384		/* r2 size to copy (div by 32 bytes) */
+	mov	r1, r1			/* r1 <- dest address (passed in) */
+	add	r2, r2, r0		/* r2 <- source end address */
+next2:
+	ldmia	r0!, {r3-r10}		/* copy from source address [r0]    */
+	stmia	r1!, {r3-r10}		/* copy to   target address [r1]    */
+	cmp	r0, r2			/* until source end address [r2]    */
+	bne	next2
+	mov	pc, lr			/* back to caller */
+
+/* ****************************************************************************
+ *  go_to_speed: -Moves to bypass, -Commits clock dividers, -puts dpll at speed
+ *		 -executed from SRAM.
+ *  R0 = PRCM_CLKCFG_CTRL - addr of valid reg
+ *  R1 = CM_CLKEN_PLL - addr dpll ctlr reg
+ *  R2 = dpll value
+ *  R3 = CM_IDLEST_CKGEN - addr dpll lock wait
+ ******************************************************************************/
+.global go_to_speed
+ go_to_speed:
+	sub	sp, sp, #0x4 /* get some stack space */
+	str	r4, [sp]     /* save r4's value */
+
+	/* move into fast relock bypass */
+	ldr	r8, pll_ctl_add
+	mov	r4, #0x2
+	str	r4, [r8]
+	ldr	r4, pll_stat
+block:
+	ldr	r8, [r4]	/* wait for bypass to take effect */
+	and	r8, r8, #0x3
+	cmp	r8, #0x1
+	bne	block
+
+	/* set new dpll dividers _after_ in bypass */
+	ldr	r4, pll_div_add
+	ldr	r8, pll_div_val
+	str	r8, [r4]
+
+	/* now prepare GPMC (flash) for new dpll speed */
+	/* flash needs to be stable when we jump back to it */
+	ldr	r4, cfg3_0_addr
+	ldr	r8, cfg3_0_val
+	str	r8, [r4]
+	ldr	r4, cfg4_0_addr
+	ldr	r8, cfg4_0_val
+	str	r8, [r4]
+	ldr	r4, cfg1_0_addr
+	ldr	r8, [r4]
+	orr	r8, r8, #0x3	 /* up gpmc divider */
+	str	r8, [r4]
+
+	/* setup to 2x loop though code.  The first loop pre-loads the
+	 * icache, the 2nd commits the prcm config, and locks the dpll
+	 */
+	mov	r4, #0x1000	 /* spin spin spin */
+	mov	r8, #0x4	 /* first pass condition & set registers */
+	cmp	r8, #0x4
+2:
+	ldrne	r8, [r3]	 /* DPLL lock check */
+	and	r8, r8, #0x7
+	cmp	r8, #0x2
+	beq	4f
+3:
+	subeq	r8, r8, #0x1
+	streq	r8, [r0]	 /* commit dividers (2nd time) */
+	nop
+lloop1:
+	sub	r4, r4, #0x1	/* Loop currently necessary else bad jumps */
+	nop
+	cmp	r4, #0x0
+	bne	lloop1
+	mov	r4, #0x40000
+	cmp	r8, #0x1
+	nop
+	streq	r2, [r1]	/* lock dpll (2nd time) */
+	nop
+lloop2:
+	sub	r4, r4, #0x1	/* loop currently necessary else bad jumps */
+	nop
+	cmp	r4, #0x0
+	bne	lloop2
+	mov	r4, #0x40000
+	cmp	r8, #0x1
+	nop
+	ldreq	r8, [r3]	 /* get lock condition for dpll */
+	cmp	r8, #0x4	 /* first time though? */
+	bne	2b
+	moveq	r8, #0x2	 /* set to dpll check condition. */
+	beq	3b		 /* if condition not true branch */
+4:
+	ldr	r4, [sp]
+	add	sp, sp, #0x4	 /* return stack space */
+	mov	pc, lr		 /* back to caller, locked */
+
+_go_to_speed: .word go_to_speed
+
+/* these constants need to be close for PIC code */
+cfg3_0_addr:
+    .word  GPMC_CONFIG3_0
+cfg3_0_val:
+    .word  H4_24XX_GPMC_CONFIG3_0
+cfg4_0_addr:
+    .word  GPMC_CONFIG4_0
+cfg4_0_val:
+    .word  H4_24XX_GPMC_CONFIG4_0
+cfg1_0_addr:
+    .word  GPMC_CONFIG1_0
+pll_ctl_add:
+    .word CM_CLKEN_PLL
+pll_stat:
+    .word CM_IDLEST_CKGEN
+pll_div_add:
+    .word CM_CLKSEL1_PLL
+pll_div_val:
+    .word DPLL_VAL	/* DPLL setting (300MHz default) */
+
+.globl lowlevel_init
+lowlevel_init:
+	ldr	sp,	SRAM_STACK
+	str	ip,	[sp]	/* stash old link register */
+	mov	ip,	lr	/* save link reg across call */
+	bl	s_init		/* go setup pll,mux,memory */
+	ldr	ip,	[sp]	/* restore save ip */
+	mov	lr,	ip	/* restore link reg */
+
+	/* map interrupt controller */
+	ldr	r0,	VAL_INTH_SETUP
+	mcr	p15, 0, r0, c15, c2, 4
+
+	/* back to arch calling code */
+	mov	pc,	lr
+
+	/* the literal pools origin */
+	.ltorg
+
+REG_CONTROL_STATUS:
+	.word CONTROL_STATUS
+VAL_INTH_SETUP:
+	.word PERIFERAL_PORT_BASE
+SRAM_STACK:
+	.word LOW_LEVEL_SRAM_STACK