[Blackfin]PATCH-1/2]: Remove obsolete blackfin port and add bf533 platform support

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;