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-/*
- * U-boot - start.S Startup file of u-boot for BF533/BF561
- *
- * Copyright (c) 2005-2007 Analog Devices Inc.
- *
- * 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., 51 Franklin St, Fifth Floor, Boston,
- * MA 02110-1301 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 <config.h>
-#include <asm/blackfin.h>
-
-#include <asm/mach-common/bits/core.h>
-#include <asm/mach-common/bits/dma.h>
-#include <asm/mach-common/bits/pll.h>
-
-.global _stext;
-.global __bss_start;
-.global start;
-.global _start;
-.global edata;
-.global _exit;
-.global init_sdram;
-
-.text
-_start:
-start:
-_stext:
-
- R0 = 0x32;
- 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.
- */
- r0 = 0;
- lc0 = r0;
- lc1 = r0;
-
- 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 = (EVT0 >> 16);
- p0.l = (EVT0 & 0xFFFF);
- p0 += 8;
- p1 = 14;
- r1 = 0;
- LSETUP(4,4) lc0 = p1;
- [ p0 ++ ] = r1;
-
- p0.h = hi(SICA_IWR0);
- p0.l = lo(SICA_IWR0);
- r0.l = 0x1;
- w[p0] = r0.l;
- SSYNC;
-
- sp.l = (0xffb01000 & 0xFFFF);
- sp.h = (0xffb01000 >> 16);
-
- /*
- * Check if the code is in SDRAM
- * If the code is in SDRAM, skip SDRAM initializaiton
- */
- call get_pc;
- r3.l = 0x0;
- r3.h = 0x2000;
- cc = r0 < r3 (iu);
- if cc jump sdram_initialized;
- call init_sdram;
- /* relocate into to RAM */
-sdram_initialized:
- call get_pc;
-offset:
- r2.l = offset;
- r2.h = offset;
- r3.l = start;
- r3.h = start;
- r1 = r2 - r3;
-
- r0 = r0 - r1;
- p1 = r0;
-
- p2.l = (CFG_MONITOR_BASE & 0xffff);
- p2.h = (CFG_MONITOR_BASE >> 16);
-
- p3 = 0x04;
- p4.l = ((CFG_MONITOR_BASE + CFG_MONITOR_LEN) & 0xffff);
- p4.h = ((CFG_MONITOR_BASE + CFG_MONITOR_LEN) >> 16);
-loop1:
- r1 = [p1 ++ p3];
- [p2 ++ p3] = r1;
- cc=p2==p4;
- if !cc jump loop1;
- /*
- * 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 = (EVT15 & 0xFFFF);
- p0.h = (EVT15 >> 16);
-
- p1.l = _real_start;
- p1.h = _real_start;
- [p0] = p1;
-
- p0.l = (IMASK & 0xFFFF);
- p0.h = (IMASK >> 16);
- r0.l = LO(EVT_IVG15);
- r0.h = HI(EVT_IVG15);
- [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;
-
- /* 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_INST_SRAM); /* Destination Address (high) */
- R1.L = lo(L1_INST_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:
- R6 = 0x1 (Z);
- W[P1+OFFSET_(IMDMA_S0_X_MODIFY)] = R6; /* Source Modify = 1 */
- W[P1+OFFSET_(IMDMA_D0_X_MODIFY)] = R6; /* Destination Modify = 1 */
-
- [P1+OFFSET_(IMDMA_S0_START_ADDR)] = R0; /* Set Source Base Address */
- W[P1+OFFSET_(IMDMA_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_(IMDMA_S0_CONFIG)] = R3;
-
- [P1+OFFSET_(IMDMA_D0_START_ADDR)] = R1; /* Set Destination Base Address */
- W[P1+OFFSET_(IMDMA_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_(IMDMA_D0_CONFIG)] = R4;
-
-WAIT_DMA_DONE:
- p0.h = hi(IMDMA_D0_IRQ_STATUS);
- p0.l = lo(IMDMA_D0_IRQ_STATUS);
- R0 = W[P0](Z);
- CC = BITTST(R0, 0);
- if ! CC jump WAIT_DMA_DONE
-
- R0 = 0x1;
- W[P1+OFFSET_(IMDMA_D0_IRQ_STATUS)] = R0; /* Write 1 to clear DMA interrupt */
-
- /* 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;
-get_pc:
- r0 = rets;
- rts;