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firmware: qcom_scm: Dynamically support SMCCC and legacy conventions

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Dynamically support SMCCCC and legacy conventions by detecting which
convention to use at runtime. qcom_scm_call_atomic and qcom_scm_call can
then be moved in qcom_scm.c and use underlying convention backend as
appropriate. Thus, rename qcom_scm-64,-32 to reflect that they are
backends for -smc and -legacy, respectively.

Also add support for making SCM calls earlier than when SCM driver
probes to support use cases such as qcom_scm_set_cold_boot_addr. Support
is added by lazily initializing the convention and guarding the query
with a spin lock.  The limitation of these early SCM calls is that they
cannot use DMA, as in the case of >4 arguments for SMC convention and
any non-atomic call for legacy convention.

Tested-by: Brian Masney <masneyb@onstation.org> # arm32
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Elliot Berman <eberman@codeaurora.org>
Link: https://lore.kernel.org/r/1578431066-19600-18-git-send-email-eberman@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Elliot Berman
2020-01-07 13:04:26 -08:00
committed by Bjorn Andersson
parent 57d3b81671
commit 9a434cee77
6 changed files with 176 additions and 135 deletions
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27
drivers/firmware/qcom_scm.h
View File

@@ -3,6 +3,16 @@
*/
#ifndef __QCOM_SCM_INT_H
#define __QCOM_SCM_INT_H
enum qcom_scm_convention {
SMC_CONVENTION_UNKNOWN,
SMC_CONVENTION_LEGACY,
SMC_CONVENTION_ARM_32,
SMC_CONVENTION_ARM_64,
};
extern enum qcom_scm_convention qcom_scm_convention;
#define MAX_QCOM_SCM_ARGS 10
#define MAX_QCOM_SCM_RETS 3
@@ -50,11 +60,16 @@ struct qcom_scm_res {
u64 result[MAX_QCOM_SCM_RETS];
};
extern int qcom_scm_call(struct device *dev, const struct qcom_scm_desc *desc,
struct qcom_scm_res *res);
extern int qcom_scm_call_atomic(struct device *dev,
const struct qcom_scm_desc *desc,
struct qcom_scm_res *res);
#define SCM_SMC_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF))
extern int scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc,
struct qcom_scm_res *res, bool atomic);
#define SCM_LEGACY_FNID(s, c) (((s) << 10) | ((c) & 0x3ff))
extern int scm_legacy_call_atomic(struct device *dev,
const struct qcom_scm_desc *desc,
struct qcom_scm_res *res);
extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc,
struct qcom_scm_res *res);
#define QCOM_SCM_SVC_BOOT 0x01
#define QCOM_SCM_BOOT_SET_ADDR 0x01
@@ -77,8 +92,6 @@ extern int qcom_scm_call_atomic(struct device *dev,
#define QCOM_SCM_SVC_INFO 0x06
#define QCOM_SCM_INFO_IS_CALL_AVAIL 0x01
extern int __qcom_scm_is_call_available(struct device *dev, u32 svc_id,
u32 cmd_id);
#define QCOM_SCM_SVC_MP 0x0c
#define QCOM_SCM_MP_RESTORE_SEC_CFG 0x02