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Message-Id: <20231207093345.581048-1-peng.fan@oss.nxp.com>
Date: Thu, 7 Dec 2023 17:33:44 +0800
From: "Peng Fan (OSS)" <peng.fan@....nxp.com>
To: sudeep.holla@....com, cristian.marussi@....com,
mturquette@...libre.com, sboyd@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
linux-kernel@...r.kernel.org, ranjani.vaidyanathan@....com,
glen.wienecke@....com, nitin.garg_3@....com, chuck.cannon@....com,
Peng Fan <peng.fan@....com>
Subject: [PATCH V2 1/2] firmware: arm_scmi: clock: implement get permissions
From: Peng Fan <peng.fan@....com>
ARM SCMI Spec 3.2 introduces Clock Get Permission command. This patch
is to add the support. Add three bool entries to scmi_clock_info to
indicate the operation is forbidden or not. If the CLOCK_GET_PERMISSIONS
command is not supported, the three bool variables will default
set to false, otherwise they will be set according to the return result
of CLOCK_GET_PERMISSIONS.
Signed-off-by: Peng Fan <peng.fan@....com>
---
V2:
Take Cristian's suggestion, https://lore.kernel.org/all/ZWiqqfQ73tezFmSk@pluto/
drivers/firmware/arm_scmi/clock.c | 53 +++++++++++++++++++++++++++++++
include/linux/scmi_protocol.h | 4 +++
2 files changed, 57 insertions(+)
diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c
index 98511a3aa367..0e048530bea2 100644
--- a/drivers/firmware/arm_scmi/clock.c
+++ b/drivers/firmware/arm_scmi/clock.c
@@ -25,8 +25,13 @@ enum scmi_clock_protocol_cmd {
CLOCK_POSSIBLE_PARENTS_GET = 0xC,
CLOCK_PARENT_SET = 0xD,
CLOCK_PARENT_GET = 0xE,
+ CLOCK_GET_PERMISSIONS = 0xF,
};
+#define CLOCK_STATE_CONTROL_ALLOWED BIT(31)
+#define CLOCK_PARENT_CONTROL_ALLOWED BIT(30)
+#define CLOCK_RATE_CONTROL_ALLOWED BIT(29)
+
enum clk_state {
CLK_STATE_DISABLE,
CLK_STATE_ENABLE,
@@ -46,6 +51,7 @@ struct scmi_msg_resp_clock_attributes {
#define SUPPORTS_RATE_CHANGE_REQUESTED_NOTIF(x) ((x) & BIT(30))
#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(29))
#define SUPPORTS_PARENT_CLOCK(x) ((x) & BIT(28))
+#define SUPPORTS_GET_PERMISSIONS(x) ((x) & BIT(1))
u8 name[SCMI_SHORT_NAME_MAX_SIZE];
__le32 clock_enable_latency;
};
@@ -281,6 +287,35 @@ static int scmi_clock_possible_parents(const struct scmi_protocol_handle *ph, u3
return ret;
}
+static int
+scmi_clock_get_permissions(const struct scmi_protocol_handle *ph, u32 clk_id,
+ struct scmi_clock_info *clk)
+{
+ struct scmi_xfer *t;
+ u32 perm;
+ int ret;
+
+ ret = ph->xops->xfer_get_init(ph, CLOCK_GET_PERMISSIONS,
+ sizeof(clk_id), sizeof(perm), &t);
+ if (ret)
+ return ret;
+
+ put_unaligned_le32(clk_id, t->tx.buf);
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret) {
+ perm = get_unaligned_le32(t->rx.buf);
+
+ clk->state_ctrl_forbidden = !(perm & CLOCK_STATE_CONTROL_ALLOWED);
+ clk->rate_ctrl_forbidden = !(perm & CLOCK_RATE_CONTROL_ALLOWED);
+ clk->parent_ctrl_forbidden = !(perm & CLOCK_PARENT_CONTROL_ALLOWED);
+ }
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
u32 clk_id, struct scmi_clock_info *clk,
u32 version)
@@ -307,6 +342,7 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
if (PROTOCOL_REV_MAJOR(version) >= 0x2)
latency = le32_to_cpu(attr->clock_enable_latency);
clk->enable_latency = latency ? : U32_MAX;
+ clk->attributes = attributes;
}
ph->xops->xfer_put(ph, t);
@@ -327,6 +363,8 @@ static int scmi_clock_attributes_get(const struct scmi_protocol_handle *ph,
clk->rate_change_requested_notifications = true;
if (SUPPORTS_PARENT_CLOCK(attributes))
scmi_clock_possible_parents(ph, clk_id, clk);
+ if (SUPPORTS_GET_PERMISSIONS(attributes))
+ scmi_clock_get_permissions(ph, clk_id, clk);
}
return ret;
@@ -499,6 +537,10 @@ static int scmi_clock_rate_set(const struct scmi_protocol_handle *ph,
struct scmi_xfer *t;
struct scmi_clock_set_rate *cfg;
struct clock_info *ci = ph->get_priv(ph);
+ struct scmi_clock_info *clk = ci->clk + clk_id;
+
+ if (clk->rate_ctrl_forbidden)
+ return -EACCES;
ret = ph->xops->xfer_get_init(ph, CLOCK_RATE_SET, sizeof(*cfg), 0, &t);
if (ret)
@@ -585,6 +627,9 @@ scmi_clock_set_parent(const struct scmi_protocol_handle *ph, u32 clk_id,
if (parent_id >= clk->num_parents)
return -EINVAL;
+ if (clk->parent_ctrl_forbidden)
+ return -EACCES;
+
ret = ph->xops->xfer_get_init(ph, CLOCK_PARENT_SET,
sizeof(*cfg), 0, &t);
if (ret)
@@ -668,6 +713,10 @@ static int scmi_clock_enable(const struct scmi_protocol_handle *ph, u32 clk_id,
bool atomic)
{
struct clock_info *ci = ph->get_priv(ph);
+ struct scmi_clock_info *clk = ci->clk + clk_id;
+
+ if (clk->state_ctrl_forbidden)
+ return -EACCES;
return ci->clock_config_set(ph, clk_id, CLK_STATE_ENABLE,
NULL_OEM_TYPE, 0, atomic);
@@ -677,6 +726,10 @@ static int scmi_clock_disable(const struct scmi_protocol_handle *ph, u32 clk_id,
bool atomic)
{
struct clock_info *ci = ph->get_priv(ph);
+ struct scmi_clock_info *clk = ci->clk + clk_id;
+
+ if (clk->state_ctrl_forbidden)
+ return -EACCES;
return ci->clock_config_set(ph, clk_id, CLK_STATE_DISABLE,
NULL_OEM_TYPE, 0, atomic);
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index f2f05fb42d28..ad75784b567b 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -47,6 +47,9 @@ struct scmi_clock_info {
bool rate_discrete;
bool rate_changed_notifications;
bool rate_change_requested_notifications;
+ bool state_ctrl_forbidden;
+ bool rate_ctrl_forbidden;
+ bool parent_ctrl_forbidden;
union {
struct {
int num_rates;
@@ -60,6 +63,7 @@ struct scmi_clock_info {
};
int num_parents;
u32 *parents;
+ u32 attributes;
};
enum scmi_power_scale {
--
2.37.1
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