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-rw-r--r--cpu/bf533/start.S259
1 files changed, 70 insertions, 189 deletions
diff --git a/cpu/bf533/start.S b/cpu/bf533/start.S
index 6d58575..8e2d725 100644
--- a/cpu/bf533/start.S
+++ b/cpu/bf533/start.S
@@ -1,5 +1,5 @@
/*
- * U-boot - start.S Startup file of u-boot for BF533
+ * U-boot - start.S Startup file of u-boot for BF533/BF561
*
* Copyright (c) 2005 blackfin.uclinux.org
*
@@ -32,15 +32,29 @@
/*
* Note: A change in this file subsequently requires a change in
- * board/$(board_name)/config.mk for a valid u-boot.bin
+ * board/$(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>
+#include <asm/blackfin.h>
+
+.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;
+.global init_sdram;
#if (CONFIG_CCLK_DIV == 1)
#define CONFIG_CCLK_ACT_DIV CCLK_DIV1
@@ -58,31 +72,17 @@
#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;
+ R0 = 0x32;
SYSCFG = R0;
SSYNC;
/* As per HW reference manual DAG registers,
- * DATA and Address resgister shall be zero'd
+ * DATA and Address resgister shall be zero'd
* in initialization, after a reset state
*/
r1 = 0; /* Data registers zero'd */
@@ -99,7 +99,7 @@ _stext:
p3 = 0;
p4 = 0;
p5 = 0;
-
+
i0 = 0; /* DAG Registers zero'd */
i1 = 0;
i2 = 0;
@@ -120,8 +120,9 @@ _stext:
/* Set loop counters to zero, to make sure that
* hw loops are disabled.
*/
- lc0 = 0;
- lc1 = 0;
+ r0 = 0;
+ lc0 = r0;
+ lc1 = r0;
SSYNC;
@@ -149,106 +150,41 @@ no_soft_reset:
r1 = 0;
LSETUP(4,4) lc0 = p1;
[ p0 ++ ] = r1;
+
+ p0.h = hi(SIC_IWR);
+ p0.l = lo(SIC_IWR);
+ r0.l = 0x1;
+ w[p0] = r0.l;
+ SSYNC;
- /*
- * 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;
+ sp.l = (0xffb01000 & 0xFFFF);
+ sp.h = (0xffb01000 >> 16);
- p0.l = (EBIU_SDBCTL & 0xFFFF);
- p0.h = (EBIU_SDBCTL >> 16); /* SDRAM Memory Bank Control Register */
- r0 = mem_SDBCTL;
- w[p0] = r0.l;
- ssync;
+ call init_sdram;
- p0.l = (EBIU_SDRRC & 0xFFFF);
- p0.h = (EBIU_SDRRC >> 16); /* SDRAM Refresh Rate Control Register */
- r0 = mem_SDRRC;
- w[p0] = r0.l;
- ssync;
+ /* relocate into to RAM */
+ call get_pc;
+offset:
+ r2.l = offset;
+ r2.h = offset;
+ r3.l = start;
+ r3.h = start;
+ r1 = r2 - r3;
-skip_sdram_enable:
- nop;
+ r0 = r0 - r1;
+ p1 = r0;
-#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);
+
+ p3 = 0x04;
+ p4.l = ((CFG_MONITOR_BASE + CFG_MONITOR_LEN) & 0xffff);
+ p4.h = ((CFG_MONITOR_BASE + 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;
+ r1 = [p1 ++ p3];
+ [p2 ++ p3] = r1;
+ cc=p2==p4;
if !cc jump loop1;
-#endif
/*
* configure STACK
*/
@@ -273,7 +209,8 @@ loop1:
p0.l = (IMASK & 0xFFFF);
p0.h = (IMASK >> 16);
- r0 = IVG15_POS;
+ r0.l = LO(IVG15_POS);
+ r0.h = HI(IVG15_POS);
[p0] = r0;
raise 15;
p0.l = WAIT_HERE;
@@ -288,37 +225,10 @@ WAIT_HERE:
_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 Points to the beginning of SYSTEM MMR Space */
+ P1.H = hi(SYSMMR_BASE);
P1.L = lo(SYSMMR_BASE);
R0.H = reset_start; /* Source Address (high) */
@@ -329,7 +239,8 @@ copy:
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) */
+ /* Destination DMAConfig Value (8-bit words) */
+ R4.L = (DI_EN | WNR | DMAEN);
DMA:
R6 = 0x1 (Z);
@@ -342,57 +253,24 @@ DMA:
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 */
+ /* Set Destination Base Address */
+ [P1+OFFSET_(MDMA_D0_START_ADDR)] = R1;
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 */
+
+WAIT_DMA_DONE:
+ p0.h = hi(MDMA_D0_IRQ_STATUS);
+ p0.l = lo(MDMA_D0_IRQ_STATUS);
+ R0 = W[P0](Z);
+ CC = BITTST(R0, 0);
+ if ! CC jump WAIT_DMA_DONE
R0 = 0x1;
- W[P1+OFFSET_(MDMA_D0_IRQ_STATUS)] = R0; /* Write 1 to clear DMA interrupt */
-copy_end: nop;
+ /* Write 1 to clear DMA interrupt */
+ W[P1+OFFSET_(MDMA_D0_IRQ_STATUS)] = R0;
/* Initialize BSS Section with 0 s */
p1.l = __bss_start;
@@ -433,3 +311,6 @@ reset_end: nop;
_exit:
jump.s _exit;
+get_pc:
+ r0 = rets;
+ rts;
generated by cgit v1.1 at 2024-11-25 22:49:24 +0000