Messages in this thread Patch in this message | | | From | "Peng Fan (OSS)" <> | Subject | [PATCH V2 1/2] firmware: arm_scmi: clock: implement get permissions | Date | Thu, 7 Dec 2023 17:33:44 +0800 |
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From: Peng Fan <peng.fan@nxp.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@nxp.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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