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Subject[PATCH v3 12/17] firmware: qcom_scm-32: Move SMCCC register filling to qcom_scm_call
Date
Move SMCCC register filling to qcom_scm_call so that __scm_legacy_do
only needs to concern itself with retry mechanism. qcom_scm_call then is
responsible for translating qcom_scm_desc into the complete set of
register arguments and passing onto __scm_legacy_do.

Signed-off-by: Elliot Berman <eberman@codeaurora.org>
---
drivers/firmware/qcom_scm-32.c | 36 ++++++++++++++++++++++++------------
1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index ce3a61b..acd956f 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -85,6 +85,14 @@ struct qcom_scm_res {
u64 result[MAX_QCOM_SCM_RETS];
};

+/**
+ * struct arm_smccc_args
+ * @args: The array of values used in registers in smc instruction
+ */
+struct arm_smccc_args {
+ unsigned long args[8];
+};
+
#define SCM_LEGACY_FNID(s, c) (((s) << 10) | ((c) & 0x3ff))

/**
@@ -167,16 +175,14 @@ static inline void *scm_legacy_get_response_buffer(
return (void *)rsp + le32_to_cpu(rsp->buf_offset);
}

-static u32 __scm_legacy_do(u32 cmd_addr)
+static void __scm_legacy_do(const struct arm_smccc_args *smc,
+ struct arm_smccc_res *res)
{
- int context_id;
- struct arm_smccc_res res;
do {
- arm_smccc_smc(1, (unsigned long)&context_id, cmd_addr,
- 0, 0, 0, 0, 0, &res);
- } while (res.a0 == QCOM_SCM_INTERRUPTED);
-
- return res.a0;
+ arm_smccc_smc(smc->args[0], smc->args[1], smc->args[2],
+ smc->args[3], smc->args[4], smc->args[5],
+ smc->args[6], smc->args[7], res);
+ } while (res->a0 == QCOM_SCM_INTERRUPTED);
}

/**
@@ -194,10 +200,12 @@ static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
struct qcom_scm_res *res)
{
u8 arglen = desc->arginfo & 0xf;
- int ret;
+ int ret = 0, context_id;
unsigned int i;
struct scm_legacy_command *cmd;
struct scm_legacy_response *rsp;
+ struct arm_smccc_args smc = {0};
+ struct arm_smccc_res smc_res;
const size_t cmd_len = arglen * sizeof(__le32);
const size_t resp_len = MAX_QCOM_SCM_RETS * sizeof(__le32);
size_t alloc_len = sizeof(*cmd) + cmd_len + sizeof(*rsp) + resp_len;
@@ -226,10 +234,14 @@ static int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
return -ENOMEM;
}

+ smc.args[0] = 1;
+ smc.args[1] = (unsigned long)&context_id;
+ smc.args[2] = cmd_phys;
+
mutex_lock(&qcom_scm_lock);
- ret = __scm_legacy_do(cmd_phys);
- if (ret < 0)
- ret = qcom_scm_remap_error(ret);
+ __scm_legacy_do(&smc, &smc_res);
+ if (smc_res.a0)
+ ret = qcom_scm_remap_error(smc_res.a0);
mutex_unlock(&qcom_scm_lock);
if (ret)
goto out;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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