Update from 2013.01 to 2013.07

[karo-tx-uboot.git] / arch / arm / cpu / tegra-common / cache.c

diff --git a/arch/arm/cpu/tegra-common/cache.c b/arch/arm/cpu/tegra-common/cache.c
new file mode 100644 (file)
index 0000000..48e9319
--- /dev/null
+++ b/arch/arm/cpu/tegra-common/cache.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Tegra cache routines */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch-tegra/ap.h>
+#include <asm/arch/gp_padctrl.h>
+
+void config_cache(void)
+{
+       struct apb_misc_gp_ctlr *gp =
+               (struct apb_misc_gp_ctlr *)NV_PA_APB_MISC_GP_BASE;
+       u32 reg = 0;
+
+       /* enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg */
+       asm volatile(
+               "mrc p15, 0, r0, c1, c0, 1\n"
+               "orr r0, r0, #0x41\n"
+               "mcr p15, 0, r0, c1, c0, 1\n");
+
+       /* Currently, only T114 needs this L2 cache change to boot Linux */
+       reg = (readl(&gp->hidrev) & HIDREV_CHIPID_MASK);
+       if (reg != (CHIPID_TEGRA114 << HIDREV_CHIPID_SHIFT))
+               return;
+       /*
+        * Systems with an architectural L2 cache must not use the PL310.
+        * Config L2CTLR here for a data RAM latency of 3 cycles.
+        */
+       asm("mrc p15, 1, %0, c9, c0, 2" : : "r" (reg));
+       reg &= ~7;
+       reg |= 2;
+       asm("mcr p15, 1, %0, c9, c0, 2" : : "r" (reg));
+}