152 строки
3.7 KiB
C
152 строки
3.7 KiB
C
// 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,
|
|
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_scm_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;
|
|
}
|