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-rw-r--r--drivers/firmware/arm_scmi/common.h1
-rw-r--r--drivers/firmware/arm_scmi/mailbox.c57
-rw-r--r--drivers/firmware/arm_scmi/scmi_power_control.c21
-rw-r--r--drivers/firmware/arm_scmi/shmem.c5
4 files changed, 77 insertions, 7 deletions
diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h
index b5ac25dbc1ca..4b8c5250cdb5 100644
--- a/drivers/firmware/arm_scmi/common.h
+++ b/drivers/firmware/arm_scmi/common.h
@@ -326,6 +326,7 @@ void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem);
bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem,
struct scmi_xfer *xfer);
bool shmem_channel_free(struct scmi_shared_mem __iomem *shmem);
+bool shmem_channel_intr_enabled(struct scmi_shared_mem __iomem *shmem);
/* declarations for message passing transports */
struct scmi_msg_payld;
diff --git a/drivers/firmware/arm_scmi/mailbox.c b/drivers/firmware/arm_scmi/mailbox.c
index 615a3b2ad83d..0219a12e3209 100644
--- a/drivers/firmware/arm_scmi/mailbox.c
+++ b/drivers/firmware/arm_scmi/mailbox.c
@@ -21,6 +21,7 @@
* @cl: Mailbox Client
* @chan: Transmit/Receive mailbox uni/bi-directional channel
* @chan_receiver: Optional Receiver mailbox unidirectional channel
+ * @chan_platform_receiver: Optional Platform Receiver mailbox unidirectional channel
* @cinfo: SCMI channel info
* @shmem: Transmit/Receive shared memory area
*/
@@ -28,6 +29,7 @@ struct scmi_mailbox {
struct mbox_client cl;
struct mbox_chan *chan;
struct mbox_chan *chan_receiver;
+ struct mbox_chan *chan_platform_receiver;
struct scmi_chan_info *cinfo;
struct scmi_shared_mem __iomem *shmem;
};
@@ -91,6 +93,8 @@ static bool mailbox_chan_available(struct device_node *of_node, int idx)
* for replies on the a2p channel. Set as zero if not present.
* @p2a_chan: A reference to the optional p2a channel.
* Set as zero if not present.
+ * @p2a_rx_chan: A reference to the optional p2a completion channel.
+ * Set as zero if not present.
*
* At first, validate the transport configuration as described in terms of
* 'mboxes' and 'shmem', then determin which mailbox channel indexes are
@@ -98,8 +102,8 @@ static bool mailbox_chan_available(struct device_node *of_node, int idx)
*
* Return: 0 on Success or error
*/
-static int mailbox_chan_validate(struct device *cdev,
- int *a2p_rx_chan, int *p2a_chan)
+static int mailbox_chan_validate(struct device *cdev, int *a2p_rx_chan,
+ int *p2a_chan, int *p2a_rx_chan)
{
int num_mb, num_sh, ret = 0;
struct device_node *np = cdev->of_node;
@@ -109,8 +113,9 @@ static int mailbox_chan_validate(struct device *cdev,
dev_dbg(cdev, "Found %d mboxes and %d shmems !\n", num_mb, num_sh);
/* Bail out if mboxes and shmem descriptors are inconsistent */
- if (num_mb <= 0 || num_sh <= 0 || num_sh > 2 || num_mb > 3 ||
- (num_mb == 1 && num_sh != 1) || (num_mb == 3 && num_sh != 2)) {
+ if (num_mb <= 0 || num_sh <= 0 || num_sh > 2 || num_mb > 4 ||
+ (num_mb == 1 && num_sh != 1) || (num_mb == 3 && num_sh != 2) ||
+ (num_mb == 4 && num_sh != 2)) {
dev_warn(cdev,
"Invalid channel descriptor for '%s' - mbs:%d shm:%d\n",
of_node_full_name(np), num_mb, num_sh);
@@ -139,6 +144,7 @@ static int mailbox_chan_validate(struct device *cdev,
case 1:
*a2p_rx_chan = 0;
*p2a_chan = 0;
+ *p2a_rx_chan = 0;
break;
case 2:
if (num_sh == 2) {
@@ -148,10 +154,17 @@ static int mailbox_chan_validate(struct device *cdev,
*a2p_rx_chan = 1;
*p2a_chan = 0;
}
+ *p2a_rx_chan = 0;
break;
case 3:
*a2p_rx_chan = 1;
*p2a_chan = 2;
+ *p2a_rx_chan = 0;
+ break;
+ case 4:
+ *a2p_rx_chan = 1;
+ *p2a_chan = 2;
+ *p2a_rx_chan = 3;
break;
}
}
@@ -166,12 +179,12 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
struct device *cdev = cinfo->dev;
struct scmi_mailbox *smbox;
struct device_node *shmem;
- int ret, a2p_rx_chan, p2a_chan, idx = tx ? 0 : 1;
+ int ret, a2p_rx_chan, p2a_chan, p2a_rx_chan, idx = tx ? 0 : 1;
struct mbox_client *cl;
resource_size_t size;
struct resource res;
- ret = mailbox_chan_validate(cdev, &a2p_rx_chan, &p2a_chan);
+ ret = mailbox_chan_validate(cdev, &a2p_rx_chan, &p2a_chan, &p2a_rx_chan);
if (ret)
return ret;
@@ -229,6 +242,17 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev,
}
}
+ if (!tx && p2a_rx_chan) {
+ smbox->chan_platform_receiver = mbox_request_channel(cl, p2a_rx_chan);
+ if (IS_ERR(smbox->chan_platform_receiver)) {
+ ret = PTR_ERR(smbox->chan_platform_receiver);
+ if (ret != -EPROBE_DEFER)
+ dev_err(cdev, "failed to request SCMI P2A Receiver mailbox\n");
+ return ret;
+ }
+ }
+
+
cinfo->transport_info = smbox;
smbox->cinfo = cinfo;
@@ -243,9 +267,11 @@ static int mailbox_chan_free(int id, void *p, void *data)
if (smbox && !IS_ERR(smbox->chan)) {
mbox_free_channel(smbox->chan);
mbox_free_channel(smbox->chan_receiver);
+ mbox_free_channel(smbox->chan_platform_receiver);
cinfo->transport_info = NULL;
smbox->chan = NULL;
smbox->chan_receiver = NULL;
+ smbox->chan_platform_receiver = NULL;
smbox->cinfo = NULL;
}
@@ -300,8 +326,27 @@ static void mailbox_fetch_notification(struct scmi_chan_info *cinfo,
static void mailbox_clear_channel(struct scmi_chan_info *cinfo)
{
struct scmi_mailbox *smbox = cinfo->transport_info;
+ struct mbox_chan *intr_chan;
+ int ret;
shmem_clear_channel(smbox->shmem);
+
+ if (!shmem_channel_intr_enabled(smbox->shmem))
+ return;
+
+ if (smbox->chan_platform_receiver)
+ intr_chan = smbox->chan_platform_receiver;
+ else if (smbox->chan)
+ intr_chan = smbox->chan;
+ else
+ return;
+
+ ret = mbox_send_message(intr_chan, NULL);
+ /* mbox_send_message returns non-negative value on success, so reset */
+ if (ret > 0)
+ ret = 0;
+
+ mbox_client_txdone(intr_chan, ret);
}
static bool
diff --git a/drivers/firmware/arm_scmi/scmi_power_control.c b/drivers/firmware/arm_scmi/scmi_power_control.c
index 6eb7d2a4b6b1..21f467a92942 100644
--- a/drivers/firmware/arm_scmi/scmi_power_control.c
+++ b/drivers/firmware/arm_scmi/scmi_power_control.c
@@ -50,6 +50,7 @@
#include <linux/reboot.h>
#include <linux/scmi_protocol.h>
#include <linux/slab.h>
+#include <linux/suspend.h>
#include <linux/time64.h>
#include <linux/timer.h>
#include <linux/types.h>
@@ -78,6 +79,7 @@ enum scmi_syspower_state {
* @reboot_nb: A notifier_block optionally used to track reboot progress
* @forceful_work: A worker used to trigger a forceful transition once a
* graceful has timed out.
+ * @suspend_work: A worker used to trigger system suspend
*/
struct scmi_syspower_conf {
struct device *dev;
@@ -90,6 +92,7 @@ struct scmi_syspower_conf {
struct notifier_block reboot_nb;
struct delayed_work forceful_work;
+ struct work_struct suspend_work;
};
#define userspace_nb_to_sconf(x) \
@@ -249,6 +252,9 @@ static void scmi_request_graceful_transition(struct scmi_syspower_conf *sc,
case SCMI_SYSTEM_WARMRESET:
orderly_reboot();
break;
+ case SCMI_SYSTEM_SUSPEND:
+ schedule_work(&sc->suspend_work);
+ break;
default:
break;
}
@@ -277,7 +283,8 @@ static int scmi_userspace_notifier(struct notifier_block *nb,
struct scmi_system_power_state_notifier_report *er = data;
struct scmi_syspower_conf *sc = userspace_nb_to_sconf(nb);
- if (er->system_state >= SCMI_SYSTEM_POWERUP) {
+ if (er->system_state >= SCMI_SYSTEM_MAX ||
+ er->system_state == SCMI_SYSTEM_POWERUP) {
dev_err(sc->dev, "Ignoring unsupported system_state: 0x%X\n",
er->system_state);
return NOTIFY_DONE;
@@ -315,6 +322,16 @@ static int scmi_userspace_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}
+static void scmi_suspend_work_func(struct work_struct *work)
+{
+ struct scmi_syspower_conf *sc =
+ container_of(work, struct scmi_syspower_conf, suspend_work);
+
+ pm_suspend(PM_SUSPEND_MEM);
+
+ sc->state = SCMI_SYSPOWER_IDLE;
+}
+
static int scmi_syspower_probe(struct scmi_device *sdev)
{
int ret;
@@ -338,6 +355,8 @@ static int scmi_syspower_probe(struct scmi_device *sdev)
sc->userspace_nb.notifier_call = &scmi_userspace_notifier;
sc->dev = &sdev->dev;
+ INIT_WORK(&sc->suspend_work, scmi_suspend_work_func);
+
return handle->notify_ops->devm_event_notifier_register(sdev,
SCMI_PROTOCOL_SYSTEM,
SCMI_EVENT_SYSTEM_POWER_STATE_NOTIFIER,
diff --git a/drivers/firmware/arm_scmi/shmem.c b/drivers/firmware/arm_scmi/shmem.c
index 8bf495bcad09..b74e5a740f2c 100644
--- a/drivers/firmware/arm_scmi/shmem.c
+++ b/drivers/firmware/arm_scmi/shmem.c
@@ -128,3 +128,8 @@ bool shmem_channel_free(struct scmi_shared_mem __iomem *shmem)
return (ioread32(&shmem->channel_status) &
SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE);
}
+
+bool shmem_channel_intr_enabled(struct scmi_shared_mem __iomem *shmem)
+{
+ return ioread32(&shmem->flags) & SCMI_SHMEM_FLAG_INTR_ENABLED;
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-12 03:08:08 +0300