diff options
Diffstat (limited to 'drivers/firmware/qcom_scm-smc.c')
| -rw-r--r-- | drivers/firmware/qcom_scm-smc.c | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/drivers/firmware/qcom_scm-smc.c b/drivers/firmware/qcom_scm-smc.c deleted file mode 100644 index d111833364ba..000000000000 --- a/drivers/firmware/qcom_scm-smc.c +++ /dev/null @@ -1,153 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* Copyright (c) 2015,2019 The Linux Foundation. All rights reserved. - */ - -#include <linux/io.h> -#include <linux/errno.h> -#include <linux/delay.h> -#include <linux/mutex.h> -#include <linux/slab.h> -#include <linux/types.h> -#include <linux/qcom_scm.h> -#include <linux/arm-smccc.h> -#include <linux/dma-mapping.h> - -#include "qcom_scm.h" - -/** - * struct arm_smccc_args - * @args: The array of values used in registers in smc instruction - */ -struct arm_smccc_args { - unsigned long args[8]; -}; - -static DEFINE_MUTEX(qcom_scm_lock); - -#define QCOM_SCM_EBUSY_WAIT_MS 30 -#define QCOM_SCM_EBUSY_MAX_RETRY 20 - -#define SCM_SMC_N_REG_ARGS 4 -#define SCM_SMC_FIRST_EXT_IDX (SCM_SMC_N_REG_ARGS - 1) -#define SCM_SMC_N_EXT_ARGS (MAX_QCOM_SCM_ARGS - SCM_SMC_N_REG_ARGS + 1) -#define SCM_SMC_FIRST_REG_IDX 2 -#define SCM_SMC_LAST_REG_IDX (SCM_SMC_FIRST_REG_IDX + SCM_SMC_N_REG_ARGS - 1) - -static void __scm_smc_do_quirk(const struct arm_smccc_args *smc, - struct arm_smccc_res *res) -{ - unsigned long a0 = smc->args[0]; - struct arm_smccc_quirk quirk = { .id = ARM_SMCCC_QUIRK_QCOM_A6 }; - - quirk.state.a6 = 0; - - do { - arm_smccc_smc_quirk(a0, smc->args[1], smc->args[2], - smc->args[3], smc->args[4], smc->args[5], - quirk.state.a6, smc->args[7], res, &quirk); - - if (res->a0 == QCOM_SCM_INTERRUPTED) - a0 = res->a0; - - } while (res->a0 == QCOM_SCM_INTERRUPTED); -} - -static void __scm_smc_do(const struct arm_smccc_args *smc, - struct arm_smccc_res *res, bool atomic) -{ - int retry_count = 0; - - if (atomic) { - __scm_smc_do_quirk(smc, res); - return; - } - - do { - mutex_lock(&qcom_scm_lock); - - __scm_smc_do_quirk(smc, res); - - mutex_unlock(&qcom_scm_lock); - - if (res->a0 == QCOM_SCM_V2_EBUSY) { - if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY) - break; - msleep(QCOM_SCM_EBUSY_WAIT_MS); - } - } while (res->a0 == QCOM_SCM_V2_EBUSY); -} - - -int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, - enum qcom_scm_convention qcom_convention, - struct qcom_scm_res *res, bool atomic) -{ - int arglen = desc->arginfo & 0xf; - int i; - dma_addr_t args_phys = 0; - void *args_virt = NULL; - size_t alloc_len; - gfp_t flag = atomic ? GFP_ATOMIC : GFP_KERNEL; - u32 smccc_call_type = atomic ? ARM_SMCCC_FAST_CALL : ARM_SMCCC_STD_CALL; - u32 qcom_smccc_convention = (qcom_convention == SMC_CONVENTION_ARM_32) ? - ARM_SMCCC_SMC_32 : ARM_SMCCC_SMC_64; - struct arm_smccc_res smc_res; - struct arm_smccc_args smc = {0}; - - smc.args[0] = ARM_SMCCC_CALL_VAL( - smccc_call_type, - qcom_smccc_convention, - desc->owner, - SCM_SMC_FNID(desc->svc, desc->cmd)); - smc.args[1] = desc->arginfo; - for (i = 0; i < SCM_SMC_N_REG_ARGS; i++) - smc.args[i + SCM_SMC_FIRST_REG_IDX] = desc->args[i]; - - if (unlikely(arglen > SCM_SMC_N_REG_ARGS)) { - alloc_len = SCM_SMC_N_EXT_ARGS * sizeof(u64); - args_virt = kzalloc(PAGE_ALIGN(alloc_len), flag); - - if (!args_virt) - return -ENOMEM; - - if (qcom_smccc_convention == ARM_SMCCC_SMC_32) { - __le32 *args = args_virt; - - for (i = 0; i < SCM_SMC_N_EXT_ARGS; i++) - args[i] = cpu_to_le32(desc->args[i + - SCM_SMC_FIRST_EXT_IDX]); - } else { - __le64 *args = args_virt; - - for (i = 0; i < SCM_SMC_N_EXT_ARGS; i++) - args[i] = cpu_to_le64(desc->args[i + - SCM_SMC_FIRST_EXT_IDX]); - } - - args_phys = dma_map_single(dev, args_virt, alloc_len, - DMA_TO_DEVICE); - - if (dma_mapping_error(dev, args_phys)) { - kfree(args_virt); - return -ENOMEM; - } - - smc.args[SCM_SMC_LAST_REG_IDX] = args_phys; - } - - __scm_smc_do(&smc, &smc_res, atomic); - - if (args_virt) { - dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE); - kfree(args_virt); - } - - if (res) { - res->result[0] = smc_res.a1; - res->result[1] = smc_res.a2; - res->result[2] = smc_res.a3; - } - - return (long)smc_res.a0 ? qcom_scm_remap_error(smc_res.a0) : 0; - -} |