1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (C) 2019 Bryan O'Donoghue 4 * Copyright 2019, 2023 NXP 5 * 6 * Bryan O'Donoghue <bryan.odonoghue@linaro.org> 7 */ 8 9 #include <initcall.h> 10 #include <io.h> 11 #include <mm/core_memprot.h> 12 13 struct imx_caam_job_ring { 14 uint32_t jrmidr_ms; 15 uint32_t jrmidr_ls; 16 }; 17 18 #define CAAM_NUM_JOB_RINGS 4 19 20 /* CAAM ownersip definition bits */ 21 #define JROWN_NS BIT(3) 22 #define JROWN_MID 0x01 23 24 /* A basic sub-set of the CAAM */ 25 struct imx_caam_ctrl { 26 uint32_t res0; 27 uint32_t mcfgr; 28 uint32_t res1; 29 uint32_t scfgr; 30 struct imx_caam_job_ring jr[CAAM_NUM_JOB_RINGS]; 31 }; 32 33 register_phys_mem_pgdir(MEM_AREA_IO_SEC, CAAM_BASE, CORE_MMU_PGDIR_SIZE); 34 35 static TEE_Result init_caam(void) 36 { 37 struct imx_caam_ctrl *caam; 38 uint32_t reg; 39 int i; 40 41 caam = (struct imx_caam_ctrl *) 42 core_mmu_get_va(CAAM_BASE, MEM_AREA_IO_SEC, 43 sizeof(struct imx_caam_ctrl)); 44 if (!caam) 45 return TEE_ERROR_GENERIC; 46 47 /* 48 * Set job-ring ownership to non-secure by default. 49 * A Linux kernel that runs after OP-TEE will run in normal-world 50 * so we want to enable that kernel to have total ownership of the 51 * CAAM job-rings. 52 * 53 * It is possible to use CAAM job-rings inside of OP-TEE i.e. in 54 * secure world code but, to do that OP-TEE and kernel should agree 55 * via a DTB which job-rings are owned by OP-TEE and which are 56 * owned by Kernel, something that the OP-TEE CAAM driver should 57 * set up. 58 * 59 * This code below simply sets a default for the case where no 60 * runtime OP-TEE CAAM code will be run 61 */ 62 for (i = 0; i < CAAM_NUM_JOB_RINGS; i++) { 63 reg = io_read32((vaddr_t)&caam->jr[i].jrmidr_ms); 64 reg |= JROWN_NS | JROWN_MID; 65 io_write32((vaddr_t)&caam->jr[i].jrmidr_ms, reg); 66 } 67 68 return TEE_SUCCESS; 69 } 70 71 driver_init(init_caam); 72