Patch by Tolunay Orkun, 14 May 2004:

Add support for Cogent CSB472 board (8MB Flash Rev)

1 files changed, 212 insertions, 0 deletions

diff --git a/board/csb472/init.S b/board/csb472/init.S
new file mode 100644
index 0000000..ca0241b
--- /dev/null
+++ b/board/csb472/init.S
@@ -0,0 +1,212 @@
+/******************************************************************************
+ *
+ *	 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
+ *
+ *****************************************************************************/
+#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>
+
+#define LI32(reg,val) \
+	addis   reg,0,val@h;\
+	ori     reg,reg,val@l
+
+#define WDCR_EBC(reg,val) \
+	addi    r4,0,reg;\
+	mtdcr   ebccfga,r4;\
+	addis   r4,0,val@h;\
+	ori     r4,r4,val@l;\
+	mtdcr   ebccfgd,r4
+
+#define WDCR_SDRAM(reg,val) \
+	addi    r4,0,reg;\
+	mtdcr   memcfga,r4;\
+	addis   r4,0,val@h;\
+	ori     r4,r4,val@l;\
+	mtdcr   memcfgd,r4
+
+/******************************************************************************
+ * Function:	ext_bus_cntlr_init
+ *
+ * Description:	Configures EBC Controller and a few basic chip selects.
+ *
+ *		CS0 is setup to get the Boot Flash out of the addresss range
+ *		so that we may setup a stack.  CS7 is setup so that we can
+ *		access and reset the hardware watchdog.
+ *
+ *		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.
+ *
+ * Notes:	Does NOT use the stack.
+ *****************************************************************************/
+	.section ".text"
+	.align	2
+	.globl	ext_bus_cntlr_init
+	.type	ext_bus_cntlr_init, @function
+ext_bus_cntlr_init:
+	mflr	r0
+	/********************************************************************
+	 * Prefetch entire ext_bus_cntrl_init function into the icache.
+	 * This is necessary because we are going to change the same CS we
+	 * are executing from.  Otherwise a CPU lockup may occur.
+	 *******************************************************************/
+	bl	..getAddr
+..getAddr:
+	mflr	r3			/* get address of ..getAddr */
+
+	/* Calculate number of cache lines for this function */
+	addi	r4, 0, (((.Lfe0 - ..getAddr) / CFG_CACHELINE_SIZE) + 2)
+	mtctr	r4
+..ebcloop:
+	icbt	r0, r3			/* prefetch cache line for addr in r3*/
+	addi	r3, r3, CFG_CACHELINE_SIZE /* move to next cache line */
+	bdnz	..ebcloop		/* continue for $CTR 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		/* wait 200us from reset */
+	mtctr	r3
+..spinlp:
+	bdnz	..spinlp		/* spin loop */
+
+	/********************************************************************
+	 * SETUP CPC0_CR0
+	 *******************************************************************/
+	LI32(r4, 0x00c01030)
+	mtdcr	cntrl0, r4
+
+	/********************************************************************
+	 * Setup CPC0_CR1: Change PCIINT signal to PerWE
+	 *******************************************************************/
+	mfdcr	r4, cntrl1
+	ori	r4, r4, 0x4000
+	mtdcr	cntrl1, r4
+
+	/********************************************************************
+	 * Setup External Bus Controller (EBC).
+	 *******************************************************************/
+	WDCR_EBC(epcr, 0xd84c0000)
+	/********************************************************************
+	 * Memory Bank 0 (Intel 28F640J3 Flash) initialization
+	 *******************************************************************/
+	/*WDCR_EBC(pb0ap, 0x03055200)*/
+	/*WDCR_EBC(pb0ap, 0x04055200)*/
+	WDCR_EBC(pb0ap, 0x08055200)
+	WDCR_EBC(pb0cr, 0xff87a000)
+	/********************************************************************
+	 * Memory Bank 3 (Xilinx XC95144 CPLD) initialization
+	 *******************************************************************/
+	/*WDCR_EBC(pb3ap, 0x07869200)*/
+	WDCR_EBC(pb3ap, 0x04055200)
+	WDCR_EBC(pb3cr, 0xff01c000)
+	/********************************************************************
+	 * Memory Bank 1,2,4-7 (Unused) initialization
+	 *******************************************************************/
+	WDCR_EBC(pb1ap, 0)
+	WDCR_EBC(pb1cr, 0)
+	WDCR_EBC(pb2ap, 0)
+	WDCR_EBC(pb2cr, 0)
+	WDCR_EBC(pb4ap, 0)
+	WDCR_EBC(pb4cr, 0)
+	WDCR_EBC(pb5ap, 0)
+	WDCR_EBC(pb5cr, 0)
+	WDCR_EBC(pb6ap, 0)
+	WDCR_EBC(pb6cr, 0)
+	WDCR_EBC(pb7ap, 0)
+	WDCR_EBC(pb7cr, 0)
+
+	/* We are all done */
+	mtlr	r0			/* Restore link register */
+	blr				/* Return to calling function */
+.Lfe0:	.size	ext_bus_cntlr_init,.Lfe0-ext_bus_cntlr_init
+/* end ext_bus_cntlr_init() */
+
+/******************************************************************************
+ * Function:	sdram_init
+ *
+ * Description:	Configures SDRAM memory banks.
+ *
+ * Notes:	Does NOT use the stack.
+ *****************************************************************************/
+	.section ".text"
+	.align	2
+	.globl	sdram_init
+	.type	sdram_init, @function
+sdram_init:
+
+	/*
+	 * Disable memory controller to allow
+	 * values to be changed.
+	 */
+	WDCR_SDRAM(mem_mcopt1, 0x00000000)
+
+	/*
+	 * Configure Memory Banks
+	 */
+	WDCR_SDRAM(mem_mb0cf, 0x00062001)
+	WDCR_SDRAM(mem_mb1cf, 0x00000000)
+	WDCR_SDRAM(mem_mb2cf, 0x00000000)
+	WDCR_SDRAM(mem_mb3cf, 0x00000000)
+
+	/*
+	 * Set up SDTR1 (SDRAM Timing Register)
+	 */
+	WDCR_SDRAM(mem_sdtr1, 0x00854009)
+
+	/*
+	 * Set RTR (Refresh Timing Register)
+	 */
+	WDCR_SDRAM(mem_rtr,   0x10000000)
+	/* WDCR_SDRAM(mem_rtr,   0x05f00000) */
+
+	/********************************************************************
+	 * Delay to ensure 200usec have elapsed since reset. Assume worst
+	 * case that the core is running 200Mhz:
+	 *	  200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles
+	 *******************************************************************/
+	addis   r3, 0, 0x0000
+	ori     r3, r3, 0xA000		/* Wait >200us from reset */
+	mtctr   r3
+..spinlp2:
+	bdnz    ..spinlp2		/* spin loop */
+
+	/********************************************************************
+	 * Set memory controller options reg, MCOPT1.
+	 *******************************************************************/
+	WDCR_SDRAM(mem_mcopt1,0x80800000)
+
+..sdri_done:
+	blr				/* Return to calling function */
+.Lfe1:	.size	sdram_init,.Lfe1-sdram_init
+/* end sdram_init() */