init commit via android 4.4 uboot

1 files changed, 147 insertions, 0 deletions

diff --git a/board/cray/L1/init.S b/board/cray/L1/init.S
new file mode 100755
index 0000000..72a10d3
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+++ b/board/cray/L1/init.S
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+/*------------------------------------------------------------------------------+ */
+/* */
+/*       This source code has been made available to you by IBM on an AS-IS */
+/*       basis.  Anyone receiving this source is licensed under IBM */
+/*       copyrights to use it in any way he or she deems fit, including */
+/*       copying it, modifying it, compiling it, and redistributing it either */
+/*       with or without modifications.  No license under IBM patents or */
+/*       patent applications is to be implied by the copyright license. */
+/* */
+/*       Any user of this software should understand that IBM cannot provide */
+/*       technical support for this software and will not be responsible for */
+/*       any consequences resulting from the use of this software. */
+/* */
+/*       Any person who transfers this source code or any derivative work */
+/*       must include the IBM copyright notice, this paragraph, and the */
+/*       preceding two paragraphs in the transferred software. */
+/* */
+/*       COPYRIGHT   I B M   CORPORATION 1995 */
+/*       LICENSED MATERIAL  -  PROGRAM PROPERTY OF I B M */
+/*------------------------------------------------------------------------------- */
+
+/*----------------------------------------------------------------------------- */
+/* Function:     ext_bus_cntlr_init */
+/* Description:  Initializes the External Bus Controller for the external */
+/*		peripherals. IMPORTANT: For pass1 this code must run from */
+/*		cache since you can not reliably change a peripheral banks */
+/*		timing register (pbxap) while running code from that bank. */
+/*		For ex., since we are running from ROM on bank 0, we can NOT */
+/*		execute the code that modifies bank 0 timings from ROM, so */
+/*		we run it from cache. */
+/*	Bank 0 - Flash and SRAM */
+/*	Bank 1 - NVRAM/RTC */
+/*	Bank 2 - Keyboard/Mouse controller */
+/*	Bank 3 - IR controller */
+/*	Bank 4 - not used */
+/*	Bank 5 - not used */
+/*	Bank 6 - not used */
+/*	Bank 7 - FPGA registers */
+/*-----------------------------------------------------------------------------#include <config.h> */
+#include <ppc4xx.h>
+
+#define _LINUX_CONFIG_H 1	/* avoid reading Linux autoconf.h file	*/
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+
+#include <asm/cache.h>
+#include <asm/mmu.h>
+
+/* CRAY - L1: only nominally a 'walnut', since ext.Bus.Cntlr is all empty */
+/*	except for #1 which we use for DMA'ing to IOCA-like things, so the */
+/*	control registers to set that up are determined by what we've */
+/*	empirically discovered work there. */
+
+	.globl	ext_bus_cntlr_init
+ext_bus_cntlr_init:
+	mflr    r4                      /* save link register */
+	bl      ..getAddr
+..getAddr:
+	mflr    r3                      /* get address of ..getAddr */
+	mtlr    r4                      /* restore link register */
+	addi    r4,0,14                 /* set ctr to 10; used to prefetch */
+	mtctr   r4                      /* 10 cache lines to fit this function */
+					/* in cache (gives us 8x10=80 instrctns) */
+..ebcloop:
+	icbt    r0,r3                   /* prefetch cache line for addr in r3 */
+	addi    r3,r3,32		/* move to next cache line */
+	bdnz    ..ebcloop               /* continue for 10 cache lines */
+
+	/*------------------------------------------------------------------- */
+	/* Delay to ensure all accesses to ROM are complete before changing */
+	    /* bank 0 timings. 200usec should be enough. */
+	/*   200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles */
+	/*------------------------------------------------------------------- */
+	addis	r3,0,0x0
+	ori     r3,r3,0xA000          /* ensure 200usec have passed since reset */
+	mtctr   r3
+..spinlp:
+	bdnz    ..spinlp                /* spin loop */
+
+
+	/*---------------------------------------------------------------------- */
+	/* Peripheral Bank 0 (Flash) initialization */
+	/*---------------------------------------------------------------------- */
+		/* 0x7F8FFE80 slowest boot */
+	addi    r4,0,pb0ap
+	mtdcr   ebccfga,r4
+	addis   r4,0,0x9B01
+	ori     r4,r4,0x5480
+	mtdcr   ebccfgd,r4
+
+	addi    r4,0,pb0cr
+	mtdcr   ebccfga,r4
+	addis   r4,0,0xFFC5           /* BAS=0xFFC,BS=0x4(4MB),BU=0x3(R/W), */
+	ori     r4,r4,0x8000          /* BW=0x0( 8 bits) */
+	mtdcr   ebccfgd,r4
+
+	blr
+
+	/*---------------------------------------------------------------------- */
+	/* Peripheral Bank 1 (NVRAM/RTC) initialization */
+		/* CRAY:the L1 has NOT this bank, it is tied to SV2/IOCA/etc/ instead */
+		/* and we do DMA on it.  The ConfigurationRegister part is threfore */
+		/* almost arbitrary, except that our linux driver needs to know the */
+		/* address, but it can query, it.. */
+		/* */
+		/* The AccessParameter is CRITICAL, */
+		/* thouch, since it needs to agree with the electrical timings on the */
+		/* IOCA parallel interface.  That value is: 0x0185,4380 */
+		/* BurstModeEnable			BME=0 */
+		/* TransferWait				TWT=3 */
+		/* ChipSelectOnTiming		CSN=1 */
+		/* OutputEnableOnTimimg		OEN=1 */
+		/* WriteByteEnableOnTiming	WBN=1 */
+		/* WriteByteEnableOffTiming	WBF=0 */
+		/* TransferHold				TH=1 */
+		/* ReadyEnable				RE=1 */
+		/* SampleOnReady			SOR=1 */
+		/* ByteEnableMode			BEM=0 */
+		/* ParityEnable				PEN=0 */
+		/* all reserved bits=0 */
+	/*---------------------------------------------------------------------- */
+	/*---------------------------------------------------------------------- */
+	addi    r4,0,pb1ap
+	mtdcr   ebccfga,r4
+	addis   r4,0,0x0185		/* hiword */
+	ori     r4,r4,0x4380	/* loword */
+	mtdcr   ebccfgd,r4
+
+	addi    r4,0,pb1cr
+	mtdcr   ebccfga,r4
+	addis   r4,0,0xF001           /* BAS=0xF00,BS=0x0(1MB),BU=0x3(R/W), */
+	ori     r4,r4,0x8000          /* BW=0x0( 8 bits) */
+	mtdcr   ebccfgd,r4
+
+	blr
+
+/*----------------------------------------------------------------------------- */
+/* Function:	sdram_init */
+/* Description:	Configures SDRAM memory banks. */
+/*				NOTE: for CrayL1 we have ECC memory, so enable it. */
+/*....now done in C in L1.c:init_sdram for readability. */
+/*----------------------------------------------------------------------------- */
+	.globl  sdram_init
+
+sdram_init:
+ blr