Merge with http://www.denx.de/git/u-boot.git

1 files changed, 435 insertions, 0 deletions

diff --git a/cpu/bf533/start.S b/cpu/bf533/start.S
new file mode 100644
index 0000000..6d58575
--- /dev/null
+++ b/cpu/bf533/start.S
@@ -0,0 +1,435 @@
+/*
+ * U-boot - start.S Startup file of u-boot for BF533
+ *
+ * Copyright (c) 2005 blackfin.uclinux.org
+ *
+ * This file is based on head.S
+ * Copyright (c) 2003  Metrowerks/Motorola
+ * Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
+ *                     Kenneth Albanowski <kjahds@kjahds.com>,
+ *                     The Silver Hammer Group, Ltd.
+ * (c) 1995, Dionne & Associates
+ * (c) 1995, DKG Display Tech.
+ *
+ * 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
+ */
+
+/*
+ * Note: A change in this file subsequently requires a change in
+ *       board/$(board_name)/config.mk for a valid u-boot.bin
+ */
+
+#define ASSEMBLY
+
+#include <linux/config.h>
+#include <asm/blackfin.h>
+#include <config.h>
+#include <asm/mem_init.h>
+
+#if (CONFIG_CCLK_DIV == 1)
+#define CONFIG_CCLK_ACT_DIV   CCLK_DIV1
+#endif
+#if (CONFIG_CCLK_DIV == 2)
+#define CONFIG_CCLK_ACT_DIV   CCLK_DIV2
+#endif
+#if (CONFIG_CCLK_DIV == 4)
+#define CONFIG_CCLK_ACT_DIV   CCLK_DIV4
+#endif
+#if (CONFIG_CCLK_DIV == 8)
+#define CONFIG_CCLK_ACT_DIV   CCLK_DIV8
+#endif
+#ifndef CONFIG_CCLK_ACT_DIV
+#define CONFIG_CCLK_ACT_DIV   CONFIG_CCLK_DIV_not_defined_properly
+#endif
+
+.global _stext;
+.global __bss_start;
+.global start;
+.global _start;
+.global _rambase;
+.global _ramstart;
+.global _ramend;
+.global _bf533_data_dest;
+.global _bf533_data_size;
+.global edata;
+.global _initialize;
+.global _exit;
+.global flashdataend;
+
+.text
+_start:
+start:
+_stext:
+
+	R0 = 0x30;
+	SYSCFG = R0;
+	SSYNC;
+
+	/* As per HW reference manual DAG registers,
+	 * DATA and Address resgister shall be zero'd
+	 * in initialization, after a reset state
+	 */
+	r1 = 0;	/* Data registers zero'd */
+	r2 = 0;
+	r3 = 0;
+	r4 = 0;
+	r5 = 0;
+	r6 = 0;
+	r7 = 0;
+
+	p0 = 0; /* Address registers zero'd */
+	p1 = 0;
+	p2 = 0;
+	p3 = 0;
+	p4 = 0;
+	p5 = 0;
+
+	i0 = 0; /* DAG Registers zero'd */
+	i1 = 0;
+	i2 = 0;
+	i3 = 0;
+	m0 = 0;
+	m1 = 0;
+	m3 = 0;
+	m3 = 0;
+	l0 = 0;
+	l1 = 0;
+	l2 = 0;
+	l3 = 0;
+	b0 = 0;
+	b1 = 0;
+	b2 = 0;
+	b3 = 0;
+
+	/* Set loop counters to zero, to make sure that
+	 * hw loops are disabled.
+	 */
+	lc0 = 0;
+	lc1 = 0;
+
+	SSYNC;
+
+	/* Check soft reset status */
+	p0.h = SWRST >> 16;
+	p0.l = SWRST & 0xFFFF;
+	r0.l = w[p0];
+
+	cc = bittst(r0, 15);
+	if !cc jump no_soft_reset;
+
+	/* Clear Soft reset */
+	r0 = 0x0000;
+	w[p0] = r0;
+	ssync;
+
+no_soft_reset:
+	nop;
+
+	/* Clear EVT registers */
+	p0.h = (EVT_EMULATION_ADDR >> 16);
+	p0.l = (EVT_EMULATION_ADDR & 0xFFFF);
+	p0 += 8;
+	p1 = 14;
+	r1 = 0;
+	LSETUP(4,4) lc0 = p1;
+	[ p0 ++ ] = r1;
+
+	/*
+	 *  Set PLL_CTL
+	 *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
+	 *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
+	 *   - [7]     = output delay (add 200ps of delay to mem signals)
+	 *   - [6]     = input delay (add 200ps of input delay to mem signals)
+	 *   - [5]     = PDWN      : 1=All Clocks off
+	 *   - [3]     = STOPCK    : 1=Core Clock off
+	 *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
+	 *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
+	 *   all other bits set to zero
+	 */
+
+	r0 = CONFIG_VCO_MULT;	/* Load the VCO multiplier */
+	r0 = r0 << 9;		/* Shift it over */
+	r1 =  CONFIG_CLKIN_HALF;	/* Do we need to divide CLKIN by 2? */
+	r0 = r1 | r0;
+	r1 = CONFIG_PLL_BYPASS;	/* Bypass the PLL?                 */
+	r1 = r1 << 8;	/* Shift it over */
+	r0 = r1 | r0;	/* add them all together */
+
+	p0.h = (PLL_CTL >> 16);
+	p0.l = (PLL_CTL & 0xFFFF);	/* Load the address */
+	cli r2;				/* Disable interrupts */
+	w[p0] = r0;			/* Set the value */
+	idle;				/* Wait for the PLL to stablize */
+	sti r2;				/* Enable interrupts */
+	ssync;
+
+	/*
+	 * Turn on the CYCLES COUNTER
+	 */
+	r2 = SYSCFG;
+	BITSET (r2,1);
+	SYSCFG = r2;
+
+	/* Configure SCLK & CCLK Dividers */
+	r0 = CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV;
+	p0.h = (PLL_DIV >> 16);
+	p0.l = (PLL_DIV & 0xFFFF);
+	w[p0] = r0;
+	ssync;
+
+wait_for_pll_stab:
+	p0.h = (PLL_STAT >> 16);
+	p0.l = (PLL_STAT & 0xFFFF);
+	r0.l = w[p0];
+	cc = bittst(r0,5);
+	if !cc jump wait_for_pll_stab;
+
+	/* Configure SDRAM if SDRAM is already not enabled */
+	p0.l = (EBIU_SDSTAT & 0xFFFF);
+	p0.h = (EBIU_SDSTAT >> 16);
+	r0.l = w[p0];
+	cc = bittst(r0, 3);
+	if !cc jump skip_sdram_enable;
+
+	/* SDRAM initialization */
+	p0.l = (EBIU_SDGCTL & 0xFFFF);
+	p0.h = (EBIU_SDGCTL >> 16);	/* SDRAM Memory Global Control Register */
+	r0.h = (mem_SDGCTL >> 16);
+	r0.l = (mem_SDGCTL & 0xFFFF);
+	[p0] = r0;
+	ssync;
+
+	p0.l = (EBIU_SDBCTL & 0xFFFF);
+	p0.h = (EBIU_SDBCTL >> 16);	/* SDRAM Memory Bank Control Register */
+	r0 = mem_SDBCTL;
+	w[p0] = r0.l;
+	ssync;
+
+	p0.l = (EBIU_SDRRC & 0xFFFF);
+	p0.h = (EBIU_SDRRC >> 16);	/* SDRAM Refresh Rate Control Register */
+	r0 = mem_SDRRC;
+	w[p0] = r0.l;
+	ssync;
+
+skip_sdram_enable:
+	nop;
+
+#ifndef	CFG_NO_FLASH
+	/* relocate into to RAM */
+	p1.l = (CFG_FLASH_BASE & 0xffff);
+	p1.h = (CFG_FLASH_BASE >> 16);
+	p2.l = (CFG_MONITOR_BASE & 0xffff);
+	p2.h = (CFG_MONITOR_BASE >> 16);
+	r0.l = (CFG_MONITOR_LEN & 0xffff);
+	r0.h = (CFG_MONITOR_LEN >> 16);
+loop1:
+	r1 = [p1];
+	[p2] = r1;
+	p3=0x4;
+	p1=p1+p3;
+	p2=p2+p3;
+	r2=0x4;
+	r0=r0-r2;
+	cc=r0==0x0;
+	if !cc jump loop1;
+#endif
+	/*
+	 * configure STACK
+	 */
+	r0.h = (CONFIG_STACKBASE >> 16);
+	r0.l = (CONFIG_STACKBASE & 0xFFFF);
+	sp = r0;
+	fp = sp;
+
+	/*
+	 * This next section keeps the processor in supervisor mode
+	 * during kernel boot.  Switches to user mode at end of boot.
+	 * See page 3-9 of Hardware Reference manual for documentation.
+	 */
+
+	/* To keep ourselves in the supervisor mode */
+	p0.l = (EVT_IVG15_ADDR & 0xFFFF);
+	p0.h = (EVT_IVG15_ADDR >> 16);
+
+	p1.l = _real_start;
+	p1.h = _real_start;
+	[p0] = p1;
+
+	p0.l = (IMASK & 0xFFFF);
+	p0.h = (IMASK >> 16);
+	r0 = IVG15_POS;
+	[p0] = r0;
+	raise 15;
+	p0.l = WAIT_HERE;
+	p0.h = WAIT_HERE;
+	reti = p0;
+	rti;
+
+WAIT_HERE:
+	jump WAIT_HERE;
+
+.global _real_start;
+_real_start:
+	[ -- sp ] = reti;
+
+#ifdef CONFIG_EZKIT533
+	p0.l = (WDOG_CTL & 0xFFFF);
+	p0.h = (WDOG_CTL >> 16);
+	r0 = WATCHDOG_DISABLE(z);
+	w[p0] = r0;
+#endif
+
+	/* Code for initializing Async mem banks */
+	p2.h = (EBIU_AMBCTL1 >> 16);
+	p2.l = (EBIU_AMBCTL1 & 0xFFFF);
+	r0.h = (AMBCTL1VAL >> 16);
+	r0.l = (AMBCTL1VAL & 0xFFFF);
+	[p2] = r0;
+	ssync;
+
+	p2.h = (EBIU_AMBCTL0 >> 16);
+	p2.l = (EBIU_AMBCTL0 & 0xFFFF);
+	r0.h = (AMBCTL0VAL >> 16);
+	r0.l = (AMBCTL0VAL & 0xFFFF);
+	[p2] = r0;
+	ssync;
+
+	p2.h = (EBIU_AMGCTL >> 16);
+	p2.l = (EBIU_AMGCTL & 0xffff);
+	r0 = AMGCTLVAL;
+	w[p2] = r0;
+	ssync;
+
+	/* DMA reset code to Hi of L1 SRAM */
+copy:
+	P1.H = hi(SYSMMR_BASE);	/* P1 Points to the beginning of SYSTEM MMR Space */
+	P1.L = lo(SYSMMR_BASE);
+
+	R0.H = reset_start;	/* Source Address (high) */
+	R0.L = reset_start;	/* Source Address (low) */
+	R1.H = reset_end;
+	R1.L = reset_end;
+	R2 = R1 - R0;		/* Count */
+	R1.H = hi(L1_ISRAM);	/* Destination Address (high) */
+	R1.L = lo(L1_ISRAM);	/* Destination Address (low) */
+	R3.L = DMAEN;		/* Source DMAConfig Value (8-bit words) */
+	R4.L = (DI_EN | WNR | DMAEN);	/* Destination DMAConfig Value (8-bit words) */
+
+DMA:
+	R6 = 0x1 (Z);
+	W[P1+OFFSET_(MDMA_S0_X_MODIFY)] = R6;	/* Source Modify = 1 */
+	W[P1+OFFSET_(MDMA_D0_X_MODIFY)] = R6;	/* Destination Modify = 1 */
+
+	[P1+OFFSET_(MDMA_S0_START_ADDR)] = R0;	/* Set Source Base Address */
+	W[P1+OFFSET_(MDMA_S0_X_COUNT)] = R2;	/* Set Source Count */
+	/* Set Source  DMAConfig = DMA Enable,
+	Memory Read,  8-Bit Transfers, 1-D DMA, Flow - Stop */
+	W[P1+OFFSET_(MDMA_S0_CONFIG)] = R3;
+
+	[P1+OFFSET_(MDMA_D0_START_ADDR)] = R1;	/* Set Destination Base Address */
+	W[P1+OFFSET_(MDMA_D0_X_COUNT)] = R2;	/* Set Destination Count */
+	/* Set Destination DMAConfig = DMA Enable,
+	Memory Write, 8-Bit Transfers, 1-D DMA, Flow - Stop, IOC */
+	W[P1+OFFSET_(MDMA_D0_CONFIG)] = R4;
+
+	IDLE;	/* Wait for DMA to Complete */
+
+	R0 = 0x1;
+	W[P1+OFFSET_(MDMA_D0_IRQ_STATUS)] = R0;	/* Write 1 to clear DMA interrupt */
+
+	/* DMA reset code to DATA BANK A which uses this port
+	 * to avoid following problem
+	 * " Data from a Data Cache fill can be corrupoted after or during
+	 *   instruction DMA if certain core stalls exist"
+	 */
+
+copy_as_data:
+	R0.H = reset_start;	/* Source Address (high) */
+	R0.L = reset_start;	/* Source Address (low) */
+	R1.H = reset_end;
+	R1.L = reset_end;
+	R2 = R1 - R0;	/* Count */
+	R1.H = hi(DATA_BANKA_SRAM);	/* Destination Address (high) */
+	R1.L = lo(DATA_BANKA_SRAM);	/* Destination Address (low) */
+	R3.L = DMAEN;	/* Source DMAConfig Value (8-bit words) */
+	R4.L = (DI_EN | WNR | DMAEN);	/* Destination DMAConfig Value (8-bit words) */
+
+DMA_DATA:
+	R6 = 0x1 (Z);
+	W[P1+OFFSET_(MDMA_S0_X_MODIFY)] = R6;	/* Source Modify = 1 */
+	W[P1+OFFSET_(MDMA_D0_X_MODIFY)] = R6;	/* Destination Modify = 1 */
+
+ 	[P1+OFFSET_(MDMA_S0_START_ADDR)] = R0;	/* Set Source Base Address */
+	W[P1+OFFSET_(MDMA_S0_X_COUNT)] = R2;	/* Set Source Count */
+	/* Set Source      DMAConfig = DMA Enable,
+	Memory Read,  8-Bit Transfers, 1-D DMA, Flow - Stop */
+	W[P1+OFFSET_(MDMA_S0_CONFIG)] = R3;
+
+	[P1+OFFSET_(MDMA_D0_START_ADDR)] = R1;	/* Set Destination Base Address */
+	W[P1+OFFSET_(MDMA_D0_X_COUNT)] = R2;	/* Set Destination Count */
+	/* Set Destination DMAConfig = DMA Enable,
+	Memory Write, 8-Bit Transfers, 1-D DMA, Flow - Stop, IOC */
+	W[P1+OFFSET_(MDMA_D0_CONFIG)] = R4;
+
+	IDLE;	/* Wait for DMA to Complete */
+
+	R0 = 0x1;
+	W[P1+OFFSET_(MDMA_D0_IRQ_STATUS)] = R0;	/* Write 1 to clear DMA interrupt */
+
+copy_end: nop;
+
+	/* Initialize BSS Section with 0 s */
+	p1.l = __bss_start;
+	p1.h = __bss_start;
+	p2.l = _end;
+	p2.h = _end;
+	r1 = p1;
+	r2 = p2;
+	r3 = r2 - r1;
+	r3 = r3 >> 2;
+	p3 = r3;
+	lsetup (_clear_bss, _clear_bss_end ) lc1 = p3;
+	CC = p2<=p1;
+	if CC jump _clear_bss_skip;
+	r0 = 0;
+_clear_bss:
+_clear_bss_end:
+ 	[p1++] = r0;
+_clear_bss_skip:
+
+	p0.l = _start1;
+	p0.h = _start1;
+	jump (p0);
+
+reset_start:
+	p0.h = WDOG_CNT >> 16;
+	p0.l = WDOG_CNT & 0xffff;
+	r0 = 0x0010;
+	w[p0] = r0;
+	p0.h = WDOG_CTL >> 16;
+	p0.l = WDOG_CTL & 0xffff;
+	r0 = 0x0000;
+	w[p0] = r0;
+reset_wait:
+	jump reset_wait;
+
+reset_end: nop;
+
+_exit:
+	jump.s	_exit;