| /* Copyright (c) 2013-2014, 2016-2017, 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 <linux/hw_random.h> |
| #include <linux/io.h> |
| |
| #include <soc/qcom/scm.h> |
| |
| #include <asm/cacheflush.h> |
| |
| #define TZ_SVC_CRYPTO 10 |
| #define PRNG_CMD_ID 0x01 |
| |
| struct tz_prng_data { |
| uint8_t *out_buf; |
| uint32_t out_buf_sz; |
| } __packed; |
| |
| DEFINE_SCM_BUFFER(common_scm_buf) |
| #define RANDOM_BUFFER_SIZE PAGE_SIZE |
| char random_buffer[RANDOM_BUFFER_SIZE] __aligned(PAGE_SIZE); |
| |
| void __init init_random_pool(void) |
| { |
| struct tz_prng_data data; |
| int ret; |
| u32 resp; |
| struct scm_desc desc; |
| |
| data.out_buf = (uint8_t *) virt_to_phys(random_buffer); |
| desc.args[0] = (unsigned long) data.out_buf; |
| desc.args[1] = data.out_buf_sz = SZ_512; |
| desc.arginfo = SCM_ARGS(2, SCM_RW, SCM_VAL); |
| |
| dmac_flush_range(random_buffer, random_buffer + RANDOM_BUFFER_SIZE); |
| |
| if (!is_scm_armv8()) |
| 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)); |
| else |
| ret = scm_call2(SCM_SIP_FNID(TZ_SVC_CRYPTO, PRNG_CMD_ID), |
| &desc); |
| |
| if (!ret) { |
| dmac_inv_range(random_buffer, random_buffer + |
| RANDOM_BUFFER_SIZE); |
| add_hwgenerator_randomness(random_buffer, SZ_512, SZ_512 << 3); |
| } |
| } |
| |