Merge "msm: implement ARCH_RANDOM"

arch/arm/include/asm/archrandom.h

@@ -0,0 +1,20 @@
+/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef ARM_ASM_ARCHRANDOM_H
+#define ARM_ASM_ARCHRANDOM_H
+
+extern int arch_get_random_long(unsigned long *v);
+extern int arch_get_random_int(unsigned int *v);
+
+#endif

arch/arm/mach-msm/early_random.c

@@ -0,0 +1,83 @@
+/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+
+#include <mach/scm.h>
+
+#include <asm/io.h>
+#include <asm/cacheflush.h>
+
+#define TZ_SVC_CRYPTO	10
+#define PRNG_CMD_ID	0x01
+
+static int use_arch_random = 1;
+struct tz_prng_data {
+	uint8_t		*out_buf;
+	uint32_t	out_buf_sz;
+} __packed;
+
+DEFINE_SCM_BUFFER(common_scm_buf)
+DEFINE_MUTEX(arch_random_lock);
+#define RANDOM_BUFFER_SIZE	PAGE_SIZE
+char random_buffer[RANDOM_BUFFER_SIZE] __aligned(PAGE_SIZE);
+
+int arch_get_random_common(void *v, size_t size)
+{
+	struct tz_prng_data data;
+	int ret;
+	u32 resp;
+
+	if (!use_arch_random)
+		return 0;
+
+	if (size > sizeof(random_buffer))
+		return 0;
+
+	mutex_lock(&arch_random_lock);
+	data.out_buf = (uint8_t *) virt_to_phys(random_buffer);
+	data.out_buf_sz = size;
+
+	ret = scm_call_noalloc(TZ_SVC_CRYPTO, PRNG_CMD_ID, &data,
+			sizeof(data), &resp, sizeof(resp),
+			common_scm_buf, SCM_BUFFER_SIZE(common_scm_buf));
+	if (!ret) {
+		dmac_inv_range(random_buffer, random_buffer +
+						RANDOM_BUFFER_SIZE);
+		outer_inv_range(
+			(unsigned long) virt_to_phys(random_buffer),
+			(unsigned long) virt_to_phys(random_buffer) +
+						RANDOM_BUFFER_SIZE);
+		memcpy(v, random_buffer, size);
+	}
+	mutex_unlock(&arch_random_lock);
+	return !ret;
+}
+
+int arch_get_random_long(unsigned long *v)
+{
+	return arch_get_random_common(v, sizeof(unsigned long));
+}
+
+int arch_get_random_int(unsigned int *v)
+{
+	return arch_get_random_common(v, sizeof(unsigned int));
+}
+
+int arch_random_init(void)
+{
+	use_arch_random = 0;
+
+	return 0;
+}
+module_init(arch_random_init);