Add test tool to exercise SDRAM accesses in burst mode

(as standalone program, MPC8xx/PowerPC only)

1 files changed, 275 insertions, 0 deletions

diff --git a/examples/test_burst.c b/examples/test_burst.c
new file mode 100644
index 0000000..01fe239
--- /dev/null
+++ b/examples/test_burst.c
@@ -0,0 +1,275 @@
+/*
+ * (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");
+}