On Thu, Jun 24, 2021 at 07:58:09AM -0400, Thara Gopinath wrote:
> Introduce SCM calls to access/configure limits management hardware(LMH).
>
> Signed-off-by: Thara Gopinath <thara.gopinath@xxxxxxxxxx>
> ---
>
> v1->v2:
> Changed the input parameters in qcom_scm_lmh_dcvsh from payload_buf and
> payload_size to payload_fn, payload_reg, payload_val as per Bjorn's review
> comments.
>
> drivers/firmware/qcom_scm.c | 54 +++++++++++++++++++++++++++++++++++++
> drivers/firmware/qcom_scm.h | 4 +++
> include/linux/qcom_scm.h | 14 ++++++++++
> 3 files changed, 72 insertions(+)
>
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index ee9cb545e73b..19e9fb91d084 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -1147,6 +1147,60 @@ int qcom_scm_qsmmu500_wait_safe_toggle(bool en)
> }
> EXPORT_SYMBOL(qcom_scm_qsmmu500_wait_safe_toggle);
>
> +bool qcom_scm_lmh_dcvsh_available(void)
> +{
> + return __qcom_scm_is_call_available(__scm->dev, QCOM_SCM_SVC_LMH, QCOM_SCM_LMH_LIMIT_DCVSH);
> +}
> +EXPORT_SYMBOL(qcom_scm_lmh_dcvsh_available);
> +
> +int qcom_scm_lmh_profile_change(u32 profile_id)
> +{
> + struct qcom_scm_desc desc = {
> + .svc = QCOM_SCM_SVC_LMH,
> + .cmd = QCOM_SCM_LMH_LIMIT_PROFILE_CHANGE,
> + .arginfo = QCOM_SCM_ARGS(1, QCOM_SCM_VAL),
> + .args[0] = profile_id,
> + .owner = ARM_SMCCC_OWNER_SIP,
> + };
> +
> + return qcom_scm_call(__scm->dev, &desc, NULL);
> +}
> +EXPORT_SYMBOL(qcom_scm_lmh_profile_change);
> +
> +int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val,
> + u64 limit_node, u32 node_id, u64 version)
> +{
> + dma_addr_t payload_phys;
> + u32 *payload_buf;
> + int payload_size = 5 * sizeof(u32);
> +
> + struct qcom_scm_desc desc = {
> + .svc = QCOM_SCM_SVC_LMH,
> + .cmd = QCOM_SCM_LMH_LIMIT_DCVSH,
> + .arginfo = QCOM_SCM_ARGS(5, QCOM_SCM_RO, QCOM_SCM_VAL, QCOM_SCM_VAL,
> + QCOM_SCM_VAL, QCOM_SCM_VAL),
> + .args[1] = payload_size,
> + .args[2] = limit_node,
> + .args[3] = node_id,
> + .args[4] = version,
> + .owner = ARM_SMCCC_OWNER_SIP,
> + };
> +
> + payload_buf = dma_alloc_coherent(__scm->dev, payload_size, &payload_phys, GFP_KERNEL);
> + if (!payload_buf)
> + return -ENOMEM;
> +
> + payload_buf[0] = payload_fn;
> + payload_buf[1] = 0;
> + payload_buf[2] = payload_reg;
> + payload_buf[3] = 1;
> + payload_buf[4] = payload_val;
> +
> + desc.args[0] = payload_phys;
> + return qcom_scm_call(__scm->dev, &desc, NULL);
dma_free_coherent()?
