[PATCH 2/2] ARM: add a TCM memory test
Linus Walleij
linus.walleij at stericsson.com
Sat Oct 16 14:06:38 EDT 2010
This adds a simple test for the TCM memory, it will try to
exercise it a bit by calling into it and reading/writing
variables with canaries.
Cc: Rickard Andersson <rickard.andersson at stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij at stericsson.com>
---
arch/arm/Kconfig | 9 +++++
arch/arm/kernel/Makefile | 1 +
arch/arm/kernel/tcm-test.c | 82 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 92 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/kernel/tcm-test.c
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index e749933..d7999f8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1019,6 +1019,15 @@ if !MMU
source "arch/arm/Kconfig-nommu"
endif
+config TCM_TEST
+ bool "TCM testing module"
+ depends on HAVE_TCM
+ help
+ This enables a small testing module that execise the TCM
+ memory on the platform at startup to make sure it's working.
+ If you're really using the TCM it is a scarce resource so
+ this should only be selected for testing.
+
config ARM_ERRATA_411920
bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
depends on CPU_V6
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 078dd22..91af751 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_ARM_THUMBEE) += thumbee.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_ARM_UNWIND) += unwind.o
obj-$(CONFIG_HAVE_TCM) += tcm.o
+obj-$(CONFIG_TCM_TEST) += tcm-test.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_SWP_EMULATE) += swp_emulate.o
diff --git a/arch/arm/kernel/tcm-test.c b/arch/arm/kernel/tcm-test.c
new file mode 100644
index 0000000..6fc7c61
--- /dev/null
+++ b/arch/arm/kernel/tcm-test.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2010 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * TCM memory test
+ *
+ * Author: Linus Walleij <linus.walleij at stericsson.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/tcm.h>
+
+#define CANARY1 0xDEADBEEFU
+#define CANARY2 0x2BADBABEU
+#define CANARY3 0xCAFEBABEU
+
+/* Uninitialized data */
+static u32 __tcmdata tcmvar;
+/* Initialized data */
+static u32 __tcmdata tcmassigned = CANARY2;
+/* Constant */
+static const u32 __tcmconst tcmconst = CANARY3;
+
+static void __tcmlocalfunc tcm_to_tcm(void)
+{
+ int i;
+ for (i = 0; i < 100; i++)
+ tcmvar ++;
+}
+
+static void __tcmfunc hello_tcm(void)
+{
+ /* Some abstract code that runs in ITCM */
+ int i;
+ for (i = 0; i < 100; i++) {
+ tcmvar ++;
+ }
+ tcm_to_tcm();
+}
+
+static void __init test_tcm(void)
+{
+ u32 *tcmem;
+ int i;
+
+ hello_tcm();
+ pr_info("Hello TCM executed from ITCM RAM\n");
+
+ pr_info("TCM variable from testrun: %u @ %p\n", tcmvar, &tcmvar);
+ BUG_ON(tcmvar != 200);
+
+ tcmvar = CANARY1;
+ pr_info("TCM variable: 0x%x @ %p\n", tcmvar, &tcmvar);
+ BUG_ON(tcmvar != CANARY1);
+
+ pr_info("TCM assigned variable: 0x%x @ %p\n", tcmassigned, &tcmassigned);
+ BUG_ON(tcmassigned != CANARY2);
+
+ pr_info("TCM constant: 0x%x @ %p\n", tcmconst, &tcmconst);
+ BUG_ON(tcmconst != CANARY3);
+
+ /* Allocate some TCM memory from the pool */
+ tcmem = tcm_alloc(20);
+ if (tcmem) {
+ pr_info("TCM Allocated 20 bytes of TCM @ %p\n", tcmem);
+ tcmem[0] = CANARY1;
+ tcmem[1] = CANARY2;
+ tcmem[2] = CANARY3;
+ tcmem[3] = CANARY1;
+ tcmem[4] = CANARY2;
+ for (i = 0; i < 5; i++)
+ pr_info("TCM tcmem[%d] = %08x\n", i, tcmem[i]);
+ BUG_ON(tcmem[0] != CANARY1);
+ BUG_ON(tcmem[1] != CANARY2);
+ BUG_ON(tcmem[2] != CANARY3);
+ BUG_ON(tcmem[3] != CANARY1);
+ BUG_ON(tcmem[4] != CANARY2);
+ tcm_free(tcmem, 20);
+ }
+}
+
+late_initcall(test_tcm);
--
1.6.3.3
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