| Message ID | 20240115060203.813168-1-peng.fan@oss.nxp.com (mailing list archive) |
|---|---|
| State | Changes Requested, archived |
| Headers | show |
| Series | [V3,1/2] firmware: arm_scmi: Implement Clock get permissions | expand |
On Mon, Jan 15, 2024 at 02:02:02PM +0800, Peng Fan (OSS) wrote: > 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. > LGTM. Reviewed-by: Cristian Marussi <cristian.marussi@arm.com> Thanks, Cristian > Signed-off-by: Peng Fan <peng.fan@nxp.com> > --- > > V3: > Rebased on https://lore.kernel.org/linux-arm-kernel/20240110120916.2482603-1-cristian.marussi@arm.com/ > Drop attribute which is no needed > Use scmi_clock_domain_lookup > Update patch subject > > V2: > Take Cristian's suggestion, https://lore.kernel.org/all/ZWiqqfQ73tezFmSk@pluto/ > > drivers/firmware/arm_scmi/clock.c | 64 +++++++++++++++++++++++++++++++ > include/linux/scmi_protocol.h | 3 ++ > 2 files changed, 67 insertions(+) > > diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c > index 2e4d6479a639..959e48aba1b5 100644 > --- a/drivers/firmware/arm_scmi/clock.c > +++ b/drivers/firmware/arm_scmi/clock.c > @@ -28,8 +28,13 @@ 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, > @@ -49,6 +54,7 @@ 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; > }; > @@ -293,6 +299,35 @@ 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) > @@ -339,6 +374,8 @@ 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; > @@ -511,6 +548,14 @@ 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; > + > + clk = scmi_clock_domain_lookup(ci, clk_id); > + if (IS_ERR(clk)) > + return PTR_ERR(clk); > + > + if (clk->rate_ctrl_forbidden) > + return -EACCES; > > ret = ph->xops->xfer_get_init(ph, CLOCK_RATE_SET, sizeof(*cfg), 0, &t); > if (ret) > @@ -596,6 +641,9 @@ 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) > @@ -679,6 +727,14 @@ 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; > + > + clk = scmi_clock_domain_lookup(ci, clk_id); > + if (IS_ERR(clk)) > + return PTR_ERR(clk); > + > + if (clk->state_ctrl_forbidden) > + return -EACCES; > > return ci->clock_config_set(ph, clk_id, CLK_STATE_ENABLE, > NULL_OEM_TYPE, 0, atomic); > @@ -688,6 +744,14 @@ 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; > + > + clk = scmi_clock_domain_lookup(ci, clk_id); > + if (IS_ERR(clk)) > + return PTR_ERR(clk); > + > + 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..0cc40af5519a 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; > -- > 2.37.1 >
diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c index 2e4d6479a639..959e48aba1b5 100644 --- a/drivers/firmware/arm_scmi/clock.c +++ b/drivers/firmware/arm_scmi/clock.c @@ -28,8 +28,13 @@ 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, @@ -49,6 +54,7 @@ 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; }; @@ -293,6 +299,35 @@ 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) @@ -339,6 +374,8 @@ 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; @@ -511,6 +548,14 @@ 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; + + clk = scmi_clock_domain_lookup(ci, clk_id); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + if (clk->rate_ctrl_forbidden) + return -EACCES; ret = ph->xops->xfer_get_init(ph, CLOCK_RATE_SET, sizeof(*cfg), 0, &t); if (ret) @@ -596,6 +641,9 @@ 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) @@ -679,6 +727,14 @@ 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; + + clk = scmi_clock_domain_lookup(ci, clk_id); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + if (clk->state_ctrl_forbidden) + return -EACCES; return ci->clock_config_set(ph, clk_id, CLK_STATE_ENABLE, NULL_OEM_TYPE, 0, atomic); @@ -688,6 +744,14 @@ 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; + + clk = scmi_clock_domain_lookup(ci, clk_id); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + 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..0cc40af5519a 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;