firmware: qcom: scm: Add support for MC boot address API

It looks like the old QCOM_SCM_BOOT_SET_ADDR API is broken on some
MSM8916 firmware versions that implement the newer SMC32 calling
convention. It just returns -EINVAL no matter which arguments are
being passed.

This does not cause any problems downstream because it first tries
to use the new multi-cluster API replacement which is working fine.

Implement support for the multi-cluster variant of the SCM call
by attempting it first but still fallback to the old call in case
of an error. Also, to be absolutely sure only use the multi-cluster
variant with the SMC calling convention since older platforms should
not need this.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211201130505.257379-5-stephan@gerhold.net

1 files changed, 30 insertions, 2 deletions

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 0382f9fa4501..491bbf70c94a 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -266,6 +266,28 @@ static int qcom_scm_set_boot_addr(void *entry, const u8 *cpu_bits)
 	return qcom_scm_call_atomic(__scm ? __scm->dev : NULL, &desc, NULL);
 }
 
+static int qcom_scm_set_boot_addr_mc(void *entry, unsigned int flags)
+{
+	struct qcom_scm_desc desc = {
+		.svc = QCOM_SCM_SVC_BOOT,
+		.cmd = QCOM_SCM_BOOT_SET_ADDR_MC,
+		.owner = ARM_SMCCC_OWNER_SIP,
+		.arginfo = QCOM_SCM_ARGS(6),
+		.args = {
+			virt_to_phys(entry),
+			/* Apply to all CPUs in all affinity levels */
+			~0ULL, ~0ULL, ~0ULL, ~0ULL,
+			flags,
+		},
+	};
+
+	/* Need a device for DMA of the additional arguments */
+	if (!__scm || __get_convention() == SMC_CONVENTION_LEGACY)
+		return -EOPNOTSUPP;
+
+	return qcom_scm_call(__scm->dev, &desc, NULL);
+}
+
 /**
  * qcom_scm_set_warm_boot_addr() - Set the warm boot address for all cpus
  * @entry: Entry point function for the cpus
@@ -275,7 +297,10 @@ static int qcom_scm_set_boot_addr(void *entry, const u8 *cpu_bits)
  */
 int qcom_scm_set_warm_boot_addr(void *entry)
 {
-	return qcom_scm_set_boot_addr(entry, qcom_scm_cpu_warm_bits);
+	if (qcom_scm_set_boot_addr_mc(entry, QCOM_SCM_BOOT_MC_FLAG_WARMBOOT))
+		/* Fallback to old SCM call */
+		return qcom_scm_set_boot_addr(entry, qcom_scm_cpu_warm_bits);
+	return 0;
 }
 EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
 
@@ -285,7 +310,10 @@ EXPORT_SYMBOL(qcom_scm_set_warm_boot_addr);
  */
 int qcom_scm_set_cold_boot_addr(void *entry)
 {
-	return qcom_scm_set_boot_addr(entry, qcom_scm_cpu_cold_bits);
+	if (qcom_scm_set_boot_addr_mc(entry, QCOM_SCM_BOOT_MC_FLAG_COLDBOOT))
+		/* Fallback to old SCM call */
+		return qcom_scm_set_boot_addr(entry, qcom_scm_cpu_cold_bits);
+	return 0;
 }
 EXPORT_SYMBOL(qcom_scm_set_cold_boot_addr);