[PATCH v9 5/7] ARM: EXYNOS: Add .write_sec outer cache callback for L2C-310

[Marek Szyprowski]

From: Tomasz Figa <t.figa at samsung.com>

Exynos4 SoCs equipped with an L2C-310 cache controller and running under
secure firmware require certain registers of aforementioned IP to be
accessed only from secure mode. This means that SMC calls are required
for certain register writes. To handle this, an implementation of
.write_sec and .configure callbacks is provided by this patch.

Signed-off-by: Tomasz Figa <t.figa at samsung.com>
[added comment and reworked unconditional call to SMC_CMD_L2X0INVALL,
 rebased onto v3.18-rc3]
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
Acked-by: Arnd Bergmann <arnd at arndb.de>
Acked-by: Kukjin Kim <kgene.kim at samsung.com>
---
 arch/arm/mach-exynos/firmware.c | 51 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
index e8797bb78871..27ec360b5a87 100644
--- a/arch/arm/mach-exynos/firmware.c
+++ b/arch/arm/mach-exynos/firmware.c
@@ -14,7 +14,9 @@
 #include <linux/of.h>
 #include <linux/of_address.h>
 
+#include <asm/cputype.h>
 #include <asm/firmware.h>
+#include <asm/hardware/cache-l2x0.h>
 
 #include <mach/map.h>
 
@@ -75,6 +77,43 @@ static const struct firmware_ops exynos_firmware_ops = {
 	.cpu_boot		= exynos_cpu_boot,
 };
 
+static void exynos_l2_write_sec(unsigned long val, unsigned reg)
+{
+	static int l2cache_enabled;
+
+	switch (reg) {
+	case L2X0_CTRL:
+		if (val & L2X0_CTRL_EN) {
+			/*
+			 * Before the cache can be enabled, due to firmware
+			 * design, SMC_CMD_L2X0INVALL must be called.
+			 */
+			if (!l2cache_enabled) {
+				exynos_smc(SMC_CMD_L2X0INVALL, 0, 0, 0);
+				l2cache_enabled = 1;
+			}
+		} else {
+			l2cache_enabled = 0;
+		}
+		exynos_smc(SMC_CMD_L2X0CTRL, val, 0, 0);
+		break;
+
+	case L2X0_DEBUG_CTRL:
+		exynos_smc(SMC_CMD_L2X0DEBUG, val, 0, 0);
+		break;
+
+	default:
+		WARN_ONCE(1, "%s: ignoring write to reg 0x%x\n", __func__, reg);
+	}
+}
+
+static void exynos_l2_configure(const struct l2x0_regs *regs)
+{
+	exynos_smc(SMC_CMD_L2X0SETUP1, regs->tag_latency, regs->data_latency,
+			regs->prefetch_ctrl);
+	exynos_smc(SMC_CMD_L2X0SETUP2, regs->pwr_ctrl, regs->aux_ctrl, 0);
+}
+
 void __init exynos_firmware_init(void)
 {
 	struct device_node *nd;
@@ -94,4 +133,16 @@ void __init exynos_firmware_init(void)
 	pr_info("Running under secure firmware.\n");
 
 	register_firmware_ops(&exynos_firmware_ops);
+
+	/*
+	 * Exynos 4 SoCs (based on Cortex A9 and equipped with L2C-310),
+	 * running under secure firmware, require certain registers of L2
+	 * cache controller to be written in secure mode. Here .write_sec
+	 * callback is provided to perform necessary SMC calls.
+	 */
+	if (IS_ENABLED(CONFIG_CACHE_L2X0)
+	    && read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
+		outer_cache.write_sec = exynos_l2_write_sec;
+		outer_cache.configure = exynos_l2_configure;
+	}
 }
-- 
1.9.2