linux-kernel - [PATCH v3 1/8] ARM: trusted_foundations: Implement L2 cache initialization callback

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Date:   Thu, 30 Aug 2018 21:04:14 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Russell King <linux@...linux.org.uk>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/8] ARM: trusted_foundations: Implement L2 cache initialization callback

Implement L2 cache initialization firmware callback that should be invoked
early in boot in order to setup the required outer cache driver callbacks.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 arch/arm/firmware/trusted_foundations.c | 46 +++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/arch/arm/firmware/trusted_foundations.c b/arch/arm/firmware/trusted_foundations.c
index 689e6565abfc..3bf61a5933b9 100644
--- a/arch/arm/firmware/trusted_foundations.c
+++ b/arch/arm/firmware/trusted_foundations.c
@@ -18,8 +18,15 @@
 #include <linux/init.h>
 #include <linux/of.h>
 #include <asm/firmware.h>
+#include <asm/hardware/cache-l2x0.h>
+#include <asm/outercache.h>
 #include <asm/trusted_foundations.h>
 
+#define TF_CACHE_MAINT		0xfffff100
+
+#define TF_CACHE_ENABLE		1
+#define TF_CACHE_DISABLE	2
+
 #define TF_SET_CPU_BOOT_ADDR_SMC 0xfffff200
 
 #define TF_CPU_PM		0xfffffffc
@@ -67,9 +74,48 @@ static int tf_prepare_idle(void)
 	return 0;
 }
 
+#ifdef CONFIG_CACHE_L2X0
+static void tf_cache_write_sec(unsigned long val, unsigned int reg)
+{
+	static u32 l2x0_way_mask = 0xff;
+	static u32 l2x0_aux_ctrl = 0;
+
+	switch (reg) {
+	case L2X0_AUX_CTRL:
+		l2x0_aux_ctrl = val;
+
+		if (l2x0_aux_ctrl & BIT(16))
+			l2x0_way_mask = 0xffff;
+		break;
+
+	case L2X0_CTRL:
+		if (val == L2X0_CTRL_EN)
+			tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_ENABLE,
+				       l2x0_aux_ctrl);
+		else
+			tf_generic_smc(TF_CACHE_MAINT, TF_CACHE_DISABLE,
+				       l2x0_way_mask);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static int tf_init_cache(void)
+{
+	outer_cache.write_sec = tf_cache_write_sec;
+
+	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)
-- 
2.18.0