[PATCH v2 1/5] ARM: trusted_foundations: Implement L2 cache initialization callback

Dmitry Osipenko
2018-06-19T11:04:00Z

Implement L2 cache initialization firmware callback that should be invoked
early in boot to enable cache HW.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/firmware/trusted_foundations.c | 27 +++++++++++++++++++++++++
1 file changed, 27 insertions(+)

diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c
index 3fb1b5a1dce9..30df6547020f 100644
--- a/arch/arm/firmware/trusted_foundations.c
+++ b/arch/arm/firmware/trusted_foundations.c
@@ -18,8 +18,13 @@
#include <linux/init.h>
#include <linux/of.h>
#include <asm/firmware.h>
+#include <asm/outercache.h>
#include <asm/trusted_foundations.h>

+#define TF_CACHE_MAINT 0xfffff100
+
+#define TF_CACHE_INIT 1
+
#define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200

#define TF_CPU_PM 0xfffffffc
@@ -63,9 +68,31 @@ static int tf_prepare_idle(void)
return 0;
}

+#ifdef CONFIG_CACHE_L2X0
+static void tf_cache_write_sec(unsigned long val, unsigned int reg)
+{
+ /*
+ * The L2X0 cache driver shouldn't invoke a write to a secure registers,
+ * though it's better to reinsure by printing a warning message.
+ */
+ pr_warn("%s: Ignoring write [0x%x]: 0x%08lx\n", __func__, reg, val);
+}
+
+static int tf_init_cache(void)
+{
+ outer_cache.write_sec = tf_cache_write_sec;
+ tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_INIT, 0);
+
+ return 0;
+}
+#endif /* CONFIG_CACHE_L2X0 */
+
static const struct firmware_ops trusted_foundations_ops = {
.set_cpu_boot_addr = tf_set_cpu_boot_addr,
.prepare_idle = tf_prepare_idle,
+#ifdef CONFIG_CACHE_L2X0
+ .l2x0_init = tf_init_cache,
+#endif
};

void register_trusted_foundations(struct trusted_foundations_platform_data *pd)
--
2.17.1