Add test tool to exercise SDRAM accesses in burst mode

(as standalone program, MPC8xx/PowerPC only)

CHANGELOG

@@ -2,6 +2,9 @@
 Changes for U-Boot 1.1.3:
 ======================================================================
 
+* Add test tool to exercise SDRAM accesses in burst mode
+  (as standalone program, MPC8xx/PowerPC only)
+
 * Increase CFG_MONITOR_LEN for Rattler board to match actual code
   size.
 

examples/Makefile

@@ -58,6 +58,11 @@ include $(TOPDIR)/config.mk
 SREC	= hello_world.srec
 BIN	= hello_world.bin hello_world
 
+ifeq ($(ARCH),ppc)
+SREC	= test_burst.srec
+BIN	= test_burst.bin test_burst
+endif
+
 ifeq ($(ARCH),i386)
 SREC   += 82559_eeprom.srec
 BIN    += 82559_eeprom.bin 82559_eeprom
@@ -96,6 +101,7 @@ LIB	= libstubs.a
 LIBAOBJS=
 ifeq ($(ARCH),ppc)
 LIBAOBJS+= $(ARCH)_longjmp.o $(ARCH)_setjmp.o
+LIBAOBJS+= test_burst_lib.o
 endif
 LIBCOBJS= stubs.o
 LIBOBJS	= $(LIBAOBJS) $(LIBCOBJS)

examples/test_burst.c

+/*
+ * (C) Copyright 2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * The test exercises SDRAM accesses in burst mode
+ */
+
+#include <common.h>
+#include <exports.h>
+
+#include <commproc.h>
+#include <asm/mmu.h>
+#include <asm/processor.h>
+
+#include <serial.h>
+#include <watchdog.h>
+
+#include "test_burst.h"
+
+/* 8 MB test region of physical RAM */
+#define TEST_PADDR	0x00800000
+/* The uncached virtual region */
+#define TEST_VADDR_NC	0x00800000
+/* The cached virtual region */
+#define TEST_VADDR_C	0x01000000
+/* When an error is detected, the address where the error has been found,
+   and also the current and the expected data will be written to
+   the following flash address
+*/
+#define TEST_FLASH_ADDR	0x40100000
+
+static void test_prepare (void);
+static int test_burst_start (unsigned long size, unsigned long pattern);
+static void test_map_8M (unsigned long paddr, unsigned long vaddr, int cached);
+static int test_mmu_is_on(void);
+static void test_desc(unsigned long size);
+static void test_error(char * step, volatile void * addr, unsigned long val, unsigned long pattern);
+static void signal_start(void);
+static void signal_error(void);
+static void test_usage(void);
+
+static unsigned long test_pattern [] = {
+	0x00000000,
+	0xffffffff,
+	0x55555555,
+	0xaaaaaaaa,
+};
+
+
+int test_burst (int argc, char *argv[])
+{
+	unsigned long size = CACHE_LINE_SIZE;
+	int res;
+	int i;
+
+	if (argc == 2) {
+		char * d;
+		for (size = 0, d = argv[1]; *d >= '0' && *d <= '9'; d++) {
+			size *= 10;
+			size += *d - '0';
+		}
+		if (size == 0 || *d) {
+			test_usage();
+			return 1;
+		}
+	} else if (argc > 2) {
+		test_usage();
+		return 1;
+	}
+
+	size +=  (CACHE_LINE_SIZE - 1);
+	size &= ~(CACHE_LINE_SIZE - 1);
+
+	if (!test_mmu_is_on()) {
+		test_prepare();
+	}
+
+	test_desc(size);
+
+	for (i = 0; i < sizeof(test_pattern) / sizeof(test_pattern[0]); i++) {
+		res = test_burst_start(size, test_pattern[i]);
+		if (res != 0) {
+			goto Done;
+		}
+	}
+Done:
+	return res;
+}
+
+static void test_prepare (void)
+{
+	volatile immap_t *immr = (immap_t *)  CFG_IMMR;
+
+	printf ("\n");
+
+	caches_init();
+	disable_interrupts();
+	mmu_init();
+
+	printf ("Interrupts are disabled\n");
+	printf ("I-Cache is ON\n");
+	printf ("D-Cache is ON\n");
+	printf ("MMU is ON\n");
+
+	printf ("\n");
+
+	test_map_8M (TEST_PADDR, TEST_VADDR_NC, 0);
+	test_map_8M (TEST_PADDR, TEST_VADDR_C,  1);
+
+	test_map_8M (TEST_FLASH_ADDR & 0xFF800000, TEST_FLASH_ADDR & 0xFF800000, 0);
+
+	/* Configure PD.8 and PD.9 as general purpose output */
+	immr->im_ioport.iop_pdpar &= ~0x00C0;
+	immr->im_ioport.iop_pddir |=  0x00C0;
+}
+
+static int test_burst_start (unsigned long size, unsigned long pattern)
+{
+	volatile unsigned long * vaddr_c = (unsigned long *)TEST_VADDR_C;
+	volatile unsigned long * vaddr_nc = (unsigned long *)TEST_VADDR_NC;
+	int i, n;
+	int res = 1;
+
+	printf ("Test pattern %08x ...", pattern);
+
+	n = size / 4;
+
+	for (i = 0; i < n; i ++) {
+		vaddr_c [i] = pattern;
+	}
+	signal_start();
+	flush_dcache_range((unsigned long)vaddr_c, (unsigned long)(vaddr_c + n) - 1);
+
+	for (i = 0; i < n; i ++) {
+		register unsigned long tmp = vaddr_nc [i];
+		if (tmp != pattern) {
+			test_error("2a", vaddr_nc + i, tmp, pattern);
+			goto Done;
+		}
+	}
+
+	for (i = 0; i < n; i ++) {
+		register unsigned long tmp = vaddr_c [i];
+		if (tmp != pattern) {
+			test_error("2b", vaddr_c + i, tmp, pattern);
+			goto Done;
+		}
+	}
+
+	for (i = 0; i < n; i ++) {
+		vaddr_nc [i] = pattern;
+	}
+
+	for (i = 0; i < n; i ++) {
+		register unsigned long tmp = vaddr_nc [i];
+		if (tmp != pattern) {
+			test_error("3a", vaddr_nc + i, tmp, pattern);
+			goto Done;
+		}
+	}
+
+	signal_start();
+	for (i = 0; i < n; i ++) {
+		register unsigned long tmp = vaddr_c [i];
+		if (tmp != pattern) {
+			test_error("3b", vaddr_c + i, tmp, pattern);
+			goto Done;
+		}
+	}
+
+	res = 0;
+Done:
+	printf(" %s\n", res == 0 ? "OK" : "");
+
+	return res;
+}
+
+static void test_map_8M (unsigned long paddr, unsigned long vaddr, int cached)
+{
+	mtspr (MD_EPN, (vaddr & 0xFFFFFC00) | MI_EVALID);
+	mtspr (MD_TWC, MI_PS8MEG | MI_SVALID);
+	mtspr (MD_RPN, (paddr & 0xFFFFF000) | MI_BOOTINIT | (cached ? 0 : 2));
+	mtspr (MD_AP, MI_Kp);
+}
+
+static int test_mmu_is_on(void)
+{
+	unsigned long msr;
+
+	asm volatile("mfmsr %0" : "=r" (msr) :);
+
+	return msr & MSR_DR;
+}
+
+static void test_desc(unsigned long size)
+{
+	printf(
+	"The following tests will be conducted:\n"
+	"1)  Map %d-byte region of physical RAM at 0x%08x\n"
+	"    into two virtual regions:\n"
+	"    one cached at 0x%08x and\n"
+	"    the the other uncached at 0x%08x.\n",
+	size, TEST_PADDR, TEST_VADDR_NC, TEST_VADDR_C);
+
+	puts(
+	"2)  Fill the cached region with a pattern, and flush the cache\n"
+	"2a) Check the uncached region to match the pattern\n"
+	"2b) Check the cached region to match the pattern\n"
+	"3)  Fill the uncached region with a pattern\n"
+	"3a) Check the cached region to match the pattern\n"
+	"3b) Check the uncached region to match the pattern\n"
+	"2b) Change the patterns and go to step 2\n"
+	"\n"
+	);
+}
+
+static void test_error(
+	char * step, volatile void * addr, unsigned long val, unsigned long pattern)
+{
+	volatile unsigned long * p = (void *)TEST_FLASH_ADDR;
+
+	signal_error();
+
+	p[0] = (unsigned long)addr;
+	p[1] = val;
+	p[2] = pattern;
+
+	printf ("\nError at step %s, addr %08x: read %08x, pattern %08x",
+		step, addr, val, pattern);
+}
+
+static void signal_start(void)
+{
+	volatile immap_t *immr = (immap_t *)  CFG_IMMR;
+
+	if (immr->im_ioport.iop_pddat & 0x0080) {
+		immr->im_ioport.iop_pddat &= ~0x0080;
+	} else {
+		immr->im_ioport.iop_pddat |= 0x0080;
+	}
+}
+
+static void signal_error(void)
+{
+	volatile immap_t *immr = (immap_t *)  CFG_IMMR;
+
+	if (immr->im_ioport.iop_pddat & 0x0040) {
+		immr->im_ioport.iop_pddat &= ~0x0040;
+	} else {
+		immr->im_ioport.iop_pddat |= 0x0040;
+	}
+}
+
+static void test_usage(void)
+{
+	printf("Usage: go 0x40004 [size]\n");
+}

examples/test_burst.h

+/*
+ * (C) Copyright 2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef _TEST_BURST_H
+#define _TEST_BURST_H
+
+/* Cache line size */
+#define CACHE_LINE_SIZE		16
+/* Binary logarithm of the cache line size */
+#define LG_CACHE_LINE_SIZE	4
+
+#ifndef __ASSEMBLY__
+extern void mmu_init(void);
+extern void caches_init(void);
+extern void flush_dcache_range(unsigned long start, unsigned long stop);
+#endif
+
+#endif /* _TEST_BURST_H */

examples/test_burst_lib.S

+/*
+ * (C) Copyright 2005
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * 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., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+
+#include <ppc_asm.tmpl>
+#include <ppc_defs.h>
+#include <asm/cache.h>
+#include <asm/mmu.h>
+#include "test_burst.h"
+
+	.text
+/*
+ *	void mmu_init(void);
+ *
+ *	This function turns the MMU on
+ *
+ *	Three 8 MByte regions are mapped 1:1, uncached
+ *	- SDRAM lower 8 MByte
+ *	- SDRAM higher 8 MByte
+ *	- IMMR
+ */
+	.global mmu_init
+mmu_init:
+	tlbia			/* Invalidate all TLB entries */
+	li	r8, 0
+	mtspr	MI_CTR, r8	/* Set instruction control to zero */
+	lis	r8, MD_RESETVAL@h
+	mtspr	MD_CTR, r8	/* Set data TLB control */
+
+	/* Now map the lower 8 Meg into the TLBs.  For this quick hack,
+	 * we can load the instruction and data TLB registers with the
+	 * same values.
+	 */
+	li	r8, MI_EVALID		/* Create EPN for address 0 */
+	mtspr	MI_EPN, r8
+	mtspr	MD_EPN, r8
+	li	r8, MI_PS8MEG		/* Set 8M byte page */
+	ori	r8, r8, MI_SVALID	/* Make it valid */
+	mtspr	MI_TWC, r8
+	mtspr	MD_TWC, r8
+	li	r8, MI_BOOTINIT|0x2	/* Create RPN for address 0 */
+	mtspr	MI_RPN, r8		/* Store TLB entry */
+	mtspr	MD_RPN, r8
+	lis	r8, MI_Kp@h		/* Set the protection mode */
+	mtspr	MI_AP, r8
+	mtspr	MD_AP, r8
+
+	/* Now map the higher 8 Meg into the TLBs.  For this quick hack,
+	 * we can load the instruction and data TLB registers with the
+	 * same values.
+	 */
+	lwz	r9,20(r29)		/* gd->ram_size */
+	addis	r9,r9,-0x80
+
+	mr	r8, r9			/* Higher 8 Meg in SDRAM */
+	ori	r8, r8, MI_EVALID	/* Mark page valid */
+	mtspr	MI_EPN, r8
+	mtspr	MD_EPN, r8
+	li	r8, MI_PS8MEG		/* Set 8M byte page */
+	ori	r8, r8, MI_SVALID	/* Make it valid */
+	mtspr	MI_TWC, r8
+	mtspr	MD_TWC, r8
+	mr	r8, r9
+	ori	r8, r8, MI_BOOTINIT|0x2
+	mtspr	MI_RPN, r8		/* Store TLB entry */
+	mtspr	MD_RPN, r8
+	lis	r8, MI_Kp@h		/* Set the protection mode */
+	mtspr	MI_AP, r8
+	mtspr	MD_AP, r8
+
+	/* Map another 8 MByte at the IMMR to get the processor
+	 * internal registers (among other things).
+	 */
+	mfspr	r9, 638			/* Get current IMMR */
+	andis.	r9, r9, 0xff80		/* Get 8Mbyte boundary */
+
+	mr	r8, r9			/* Create vaddr for TLB */
+	ori	r8, r8, MD_EVALID	/* Mark it valid */
+	mtspr	MD_EPN, r8
+	li	r8, MD_PS8MEG		/* Set 8M byte page */
+	ori	r8, r8, MD_SVALID	/* Make it valid */
+	mtspr	MD_TWC, r8
+	mr	r8, r9			/* Create paddr for TLB */
+	ori	r8, r8, MI_BOOTINIT|0x2 /* Inhibit cache -- Cort */
+	mtspr	MD_RPN, r8
+
+	/* We now have the lower and higher 8 Meg mapped into TLB entries,
+	 * and the caches ready to work.
+	 */
+	mfmsr	r0
+	ori	r0,r0,MSR_DR|MSR_IR
+	mtspr	SRR1,r0
+	mflr	r0
+	mtspr	SRR0,r0
+	SYNC
+	rfi	/* enables MMU */
+
+/*
+ *	void caches_init(void);
+ */
+	.globl	caches_init
+caches_init:
+	sync
+
+	mfspr	r3, IC_CST		/* Clear error bits */
+	mfspr	r3, DC_CST
+
+	lis	r3, IDC_UNALL@h		/* Unlock all */
+	mtspr	IC_CST, r3
+	mtspr	DC_CST, r3
+
+	lis	r3, IDC_INVALL@h	/* Invalidate all */
+	mtspr	IC_CST, r3
+	mtspr	DC_CST, r3
+
+	lis	r3, IDC_ENABLE@h	/* Enable all */
+	mtspr	IC_CST, r3
+	mtspr	DC_CST, r3
+
+	blr
+
+/*
+ *	void flush_dcache_range(unsigned long start, unsigned long stop);
+ */
+	.global flush_dcache_range
+flush_dcache_range:
+	li	r5,CACHE_LINE_SIZE-1
+	andc	r3,r3,r5
+	subf	r4,r3,r4
+	add	r4,r4,r5
+	srwi.	r4,r4,LG_CACHE_LINE_SIZE
+	beqlr
+	mtctr	r4
+
+1:	dcbf	0,r3
+	addi	r3,r3,CACHE_LINE_SIZE
+	bdnz	1b
+	sync				/* wait for dcbf's to get to ram */
+	blr
+
+/*
+ *	void disable_interrupts(void);
+ */
+	.global disable_interrupts
+disable_interrupts:
+	mfmsr	r0
+	rlwinm	r0,r0,0,17,15
+	mtmsr	r0
+	blr