summaryrefslogtreecommitdiff
path: root/arch/arm/mach-bcm/bcm_kona_smc.c
diff options
context:
space:
mode:
authorChristian Daudt <csd@broadcom.com>2013-02-27 09:48:49 +0400
committerChristian Daudt <csd@broadcom.com>2013-04-09 20:18:13 +0400
commitb8eb35fd594aa5b635e329d5c8efab8aaceb8619 (patch)
tree8c664f4d4daabc0a83435ef90cead2eeff751e5b /arch/arm/mach-bcm/bcm_kona_smc.c
parent07961ac7c0ee8b546658717034fe692fd12eefa9 (diff)
downloadlinux-b8eb35fd594aa5b635e329d5c8efab8aaceb8619.tar.xz
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>
Diffstat (limited to 'arch/arm/mach-bcm/bcm_kona_smc.c')
-rw-r--r--arch/arm/mach-bcm/bcm_kona_smc.c118
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;
+}