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firmware: qcom_scm: Add set remote state API 

This patch adds a set remote state SCM API.  This will be used by the
Venus and GPU subsystems to set state on the remote processors.

This work was based on two patch sets by Jordan Crouse and Stanimir
Varbanov.

Signed-off-by: Andy Gross <andy.gross@linaro.org>
hifive-unleashed-5.1
Andy Gross 2017-01-16 23:24:15 -06:00
parent 472cef345c
commit a811b420b6
5 changed files with 45 additions and 1 deletions
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18
drivers/firmware/qcom_scm-32.c
View File

@ -560,3 +560,21 @@ int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
return ret ? : le32_to_cpu(out);
}
int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
{
struct {
__le32 state;
__le32 id;
} req;
__le32 scm_ret = 0;
int ret;
req.state = cpu_to_le32(state);
req.id = cpu_to_le32(id);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_REMOTE_STATE,
&req, sizeof(req), &scm_ret, sizeof(scm_ret));
return ret ? : le32_to_cpu(scm_ret);
}

16
drivers/firmware/qcom_scm-64.c
View File

@ -358,3 +358,19 @@ int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
return ret ? : res.a1;
}
int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
{
struct qcom_scm_desc desc = {0};
struct arm_smccc_res res;
int ret;
desc.args[0] = state;
desc.args[1] = id;
desc.arginfo = QCOM_SCM_ARGS(2);
ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_REMOTE_STATE,
&desc, &res);
return ret ? : res.a1;
}

6
drivers/firmware/qcom_scm.c
View File

@ -324,6 +324,12 @@ bool qcom_scm_is_available(void)
}
EXPORT_SYMBOL(qcom_scm_is_available);
int qcom_scm_set_remote_state(u32 state, u32 id)
{
return __qcom_scm_set_remote_state(__scm->dev, state, id);
}
EXPORT_SYMBOL(qcom_scm_set_remote_state);
static int qcom_scm_probe(struct platform_device *pdev)
{
struct qcom_scm *scm;

2
drivers/firmware/qcom_scm.h
View File

@ -15,6 +15,8 @@
#define QCOM_SCM_SVC_BOOT 0x1
#define QCOM_SCM_BOOT_ADDR 0x1
#define QCOM_SCM_BOOT_ADDR_MC 0x11
#define QCOM_SCM_SET_REMOTE_STATE 0xa
extern int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id);
#define QCOM_SCM_FLAG_HLOS 0x01
#define QCOM_SCM_FLAG_COLDBOOT_MC 0x02

4
include/linux/qcom_scm.h
View File

@ -39,6 +39,7 @@ extern int qcom_scm_pas_auth_and_reset(u32 peripheral);
extern int qcom_scm_pas_shutdown(u32 peripheral);
extern void qcom_scm_cpu_power_down(u32 flags);
extern u32 qcom_scm_get_version(void);
extern int qcom_scm_set_remote_state(u32 state, u32 id);
#else
static inline
int qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
@ -64,6 +65,7 @@ qcom_scm_pas_auth_and_reset(u32 peripheral) { return -ENODEV; }
static inline int qcom_scm_pas_shutdown(u32 peripheral) { return -ENODEV; }
static inline void qcom_scm_cpu_power_down(u32 flags) {}
static inline u32 qcom_scm_get_version(void) { return 0; }
static inline u32
qcom_scm_set_remote_state(u32 state,u32 id) { return -ENODEV; }
#endif
#endif