ARM: bcm281xx: Add L2 cache enable code

- Adds a module to provide calls into secure monitor mode
- Uses this module to make secure monitor calls to enable L2 cache.

Updates from V1:
- Split DT portion into separate patch
- replace #ifdef-ed L2 code with "if".
- move init call to board init

Signed-off-by: Christian Daudt <csd@broadcom.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 118 insertions, 0 deletions

diff --git a/arch/arm/mach-bcm/bcm_kona_smc.c b/arch/arm/mach-bcm/bcm_kona_smc.c
new file mode 100644
index 000000000000..5f1d13175138
--- /dev/null
+++ b/arch/arm/mach-bcm/bcm_kona_smc.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <stdarg.h>
+#include <linux/smp.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+
+#include <asm/cacheflush.h>
+#include <linux/of_address.h>
+
+#include "bcm_kona_smc.h"
+
+struct secure_bridge_data {
+	void __iomem *bounce;		/* virtual address */
+	u32 __iomem buffer_addr;	/* physical address */
+	int initialized;
+} bridge_data;
+
+struct bcm_kona_smc_data {
+	unsigned service_id;
+	unsigned arg0;
+	unsigned arg1;
+	unsigned arg2;
+	unsigned arg3;
+};
+
+static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
+	{.compatible = "bcm,kona-smc"},
+	{},
+};
+
+/* Map in the bounce area */
+void bcm_kona_smc_init(void)
+{
+	struct device_node *node;
+
+	/* Read buffer addr and size from the device tree node */
+	node = of_find_matching_node(NULL, bcm_kona_smc_ids);
+	BUG_ON(!node);
+
+	/* Don't care about size or flags of the DT node */
+	bridge_data.buffer_addr =
+		be32_to_cpu(*of_get_address(node, 0, NULL, NULL));
+	BUG_ON(!bridge_data.buffer_addr);
+
+	bridge_data.bounce = of_iomap(node, 0);
+	BUG_ON(!bridge_data.bounce);
+
+	bridge_data.initialized = 1;
+
+	pr_info("Secure API initialized!\n");
+}
+
+/* __bcm_kona_smc() should only run on CPU 0, with pre-emption disabled */
+static void __bcm_kona_smc(void *info)
+{
+	struct bcm_kona_smc_data *data = info;
+	u32 *args = bridge_data.bounce;
+	int rc = 0;
+
+	/* Must run on CPU 0 */
+	BUG_ON(smp_processor_id() != 0);
+
+	/* Check map in the bounce area */
+	BUG_ON(!bridge_data.initialized);
+
+	/* Copy one 32 bit word into the bounce area */
+	args[0] = data->arg0;
+	args[1] = data->arg1;
+	args[2] = data->arg2;
+	args[3] = data->arg3;
+
+	/* Flush caches for input data passed to Secure Monitor */
+	if (data->service_id != SSAPI_BRCM_START_VC_CORE)
+		flush_cache_all();
+
+	/* Trap into Secure Monitor */
+	rc = bcm_kona_smc_asm(data->service_id, bridge_data.buffer_addr);
+
+	if (rc != SEC_ROM_RET_OK)
+		pr_err("Secure Monitor call failed (0x%x)!\n", rc);
+}
+
+unsigned bcm_kona_smc(unsigned service_id, unsigned arg0, unsigned arg1,
+		  unsigned arg2, unsigned arg3)
+{
+	struct bcm_kona_smc_data data;
+
+	data.service_id = service_id;
+	data.arg0 = arg0;
+	data.arg1 = arg1;
+	data.arg2 = arg2;
+	data.arg3 = arg3;
+
+	/*
+	 * Due to a limitation of the secure monitor, we must use the SMP
+	 * infrastructure to forward all secure monitor calls to Core 0.
+	 */
+	if (get_cpu() != 0)
+		smp_call_function_single(0, __bcm_kona_smc, (void *)&data, 1);
+	else
+		__bcm_kona_smc(&data);
+
+	put_cpu();
+
+	return 0;
+}