[PATCH 12/17] firmware: qcom_scm-32: Move SMCCC register filling to qcom_scm_call

Elliot Berman
2019-11-05T01:28:18Z

- Move SMCCC register filling to qcom_scm_call so that qcom_scm_call_do
only needs to concern itself with retry mechanism.
- Use arm_smccc_args struct in atomic variants as well.

Signed-off-by: Elliot Berman <eberman@codeaurora.org>
---
drivers/firmware/qcom_scm-32.c | 47 ++++++++++++++++++++++++++++--------------
1 file changed, 31 insertions(+), 16 deletions(-)

diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
index 33effed..9811560 100644
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -78,6 +78,9 @@ struct qcom_scm_desc {
u64 res[MAX_QCOM_SCM_RETS];
u32 owner;
};
+struct arm_smccc_args {
+ unsigned long a[8];
+};

#define LEGACY_FUNCNUM(s, c) (((s) << 10) | ((c) & 0x3ff))

@@ -159,16 +162,13 @@ static inline void *legacy_get_response_buffer(const struct legacy_response *rsp
return (void *)rsp + le32_to_cpu(rsp->buf_offset);
}

-static u32 __qcom_scm_call_do(u32 cmd_addr)
+static void __qcom_scm_call_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->a[0], smc->a[1], smc->a[2], smc->a[3],
+ smc->a[4], smc->a[5], smc->a[6], smc->a[7], res);
+ } while (res->a0 == QCOM_SCM_INTERRUPTED);
}

/**
@@ -193,10 +193,12 @@ static u32 __qcom_scm_call_do(u32 cmd_addr)
static int qcom_scm_call(struct device *dev, struct qcom_scm_desc *desc)
{
int arglen = desc->arginfo & 0xf;
- int ret;
+ int ret = 0, context_id;
size_t i;
struct legacy_command *cmd;
struct legacy_response *rsp;
+ struct arm_smccc_args smc = {0};
+ struct arm_smccc_res 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;
@@ -225,10 +227,14 @@ static int qcom_scm_call(struct device *dev, struct qcom_scm_desc *desc)
return -ENOMEM;
}

+ smc.a[0] = 1;
+ smc.a[1] = (unsigned long)&context_id;
+ smc.a[2] = cmd_phys;
+
mutex_lock(&qcom_scm_lock);
- ret = __qcom_scm_call_do(cmd_phys);
- if (ret < 0)
- ret = qcom_scm_remap_error(ret);
+ __qcom_scm_call_do(&smc, &res);
+ if (res.a0 < 0)
+ ret = qcom_scm_remap_error(res.a0);
mutex_unlock(&qcom_scm_lock);
if (ret)
goto out;
@@ -270,10 +276,14 @@ static int qcom_scm_call(struct device *dev, struct qcom_scm_desc *desc)
static s32 qcom_scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
{
int context_id;
+ struct arm_smccc_args smc = {0};
struct arm_smccc_res res;

- arm_smccc_smc(LEGACY_ATOMIC(svc, cmd, 1), (unsigned long)&context_id,
- arg1, 0, 0, 0, 0, 0, &res);
+ smc.a[0] = LEGACY_ATOMIC(svc, cmd, 1);
+ smc.a[1] = (unsigned long)&context_id;
+ smc.a[2] = arg1;
+ arm_smccc_smc(smc.a[0], smc.a[1], smc.a[2], smc.a[3],
+ smc.a[4], smc.a[5], smc.a[6], smc.a[7], &res);

return res.a0;
}
@@ -291,10 +301,15 @@ static s32 qcom_scm_call_atomic1(u32 svc, u32 cmd, u32 arg1)
static s32 qcom_scm_call_atomic2(u32 svc, u32 cmd, u32 arg1, u32 arg2)
{
int context_id;
+ struct arm_smccc_args smc = {0};
struct arm_smccc_res res;

- arm_smccc_smc(LEGACY_ATOMIC(svc, cmd, 2), (unsigned long)&context_id,
- arg1, arg2, 0, 0, 0, 0, &res);
+ smc.a[0] = LEGACY_ATOMIC(svc, cmd, 2);
+ smc.a[1] = (unsigned long)&context_id;
+ smc.a[2] = arg1;
+ smc.a[3] = arg2;
+ arm_smccc_smc(smc.a[0], smc.a[1], smc.a[2], smc.a[3],
+ smc.a[4], smc.a[5], smc.a[6], smc.a[7], &res);

return res.a0;