[PATCH 2/5] firmware: ti_sci: add suspend/resume support for irqs
Thomas Richard
thomas.richard at bootlin.com
Wed Nov 29 07:31:18 PST 2023
On j7200, during suspend to ram, the SoC is powered-off.
The irqs configuration is lost, so it shall be restored at resume.
The ti-sci has an internal list of irqs updated at each set/free.
All irqs in this list are restored at resume.
Signed-off-by: Thomas Richard <thomas.richard at bootlin.com>
---
drivers/firmware/ti_sci.c | 155 +++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 147 insertions(+), 8 deletions(-)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 7041befc756a..c26ec86a5ff2 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -25,6 +25,7 @@
#include <linux/soc/ti/ti-msgmgr.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <linux/reboot.h>
+#include <linux/suspend.h>
#include "ti_sci.h"
@@ -75,12 +76,24 @@ struct ti_sci_xfers_info {
* @max_msgs: Maximum number of messages that can be pending
* simultaneously in the system
* @max_msg_size: Maximum size of data per message that can be handled.
+ * @restore_irqs: Set to true if allocated irqs shall be restored at resume
*/
struct ti_sci_desc {
u8 default_host_id;
int max_rx_timeout_ms;
int max_msgs;
int max_msg_size;
+ bool restore_irqs;
+};
+
+/**
+ * struct ti_sci_irq - Description of allocated irqs
+ * @list: List head
+ * @desc: Description of the irq
+ */
+struct ti_sci_irq {
+ struct list_head list;
+ struct ti_sci_msg_req_manage_irq desc;
};
/**
@@ -97,6 +110,7 @@ struct ti_sci_desc {
* @chan_tx: Transmit mailbox channel
* @chan_rx: Receive mailbox channel
* @minfo: Message info
+ * @irqs: List of allocated irqs
* @node: list head
* @host_id: Host ID
* @users: Number of users of this instance
@@ -114,6 +128,7 @@ struct ti_sci_info {
struct mbox_chan *chan_tx;
struct mbox_chan *chan_rx;
struct ti_sci_xfers_info minfo;
+ struct ti_sci_irq irqs;
struct list_head node;
u8 host_id;
/* protected by ti_sci_list_mutex */
@@ -1890,6 +1905,29 @@ static int ti_sci_manage_irq(const struct ti_sci_handle *handle,
return ret;
}
+/**
+ * ti_sci_irqs_equal() - Helper API to compare two irqs (generic headers are not
+ * compared)
+ * @irq_a: IRQ A to compare
+ * @irq_b: IRQ B to compare
+ *
+ * Return: true if the two irqs are equal, else false.
+ */
+static bool ti_sci_irqs_equal(struct ti_sci_msg_req_manage_irq irq_a,
+ struct ti_sci_msg_req_manage_irq irq_b)
+{
+ return irq_a.valid_params == irq_b.valid_params &&
+ irq_a.src_id == irq_b.src_id &&
+ irq_a.src_index == irq_b.src_index &&
+ irq_a.dst_id == irq_b.dst_id &&
+ irq_a.dst_host_irq == irq_b.dst_host_irq &&
+ irq_a.ia_id == irq_b.ia_id &&
+ irq_a.vint == irq_b.vint &&
+ irq_a.global_event == irq_b.global_event &&
+ irq_a.vint_status_bit == irq_b.vint_status_bit &&
+ irq_a.secondary_host == irq_b.secondary_host;
+}
+
/**
* ti_sci_set_irq() - Helper api to configure the irq route between the
* requested source and destination
@@ -1913,15 +1951,39 @@ static int ti_sci_set_irq(const struct ti_sci_handle *handle, u32 valid_params,
u16 dst_host_irq, u16 ia_id, u16 vint,
u16 global_event, u8 vint_status_bit, u8 s_host)
{
+ struct ti_sci_info *info = handle_to_ti_sci_info(handle);
+ struct ti_sci_msg_req_manage_irq *desc;
+ struct ti_sci_irq *irq;
+ int ret;
+
pr_debug("%s: IRQ set with valid_params = 0x%x from src = %d, index = %d, to dst = %d, irq = %d,via ia_id = %d, vint = %d, global event = %d,status_bit = %d\n",
__func__, valid_params, src_id, src_index,
dst_id, dst_host_irq, ia_id, vint, global_event,
vint_status_bit);
- return ti_sci_manage_irq(handle, valid_params, src_id, src_index,
- dst_id, dst_host_irq, ia_id, vint,
- global_event, vint_status_bit, s_host,
- TI_SCI_MSG_SET_IRQ);
+ ret = ti_sci_manage_irq(handle, valid_params, src_id, src_index,
+ dst_id, dst_host_irq, ia_id, vint,
+ global_event, vint_status_bit, s_host,
+ TI_SCI_MSG_SET_IRQ);
+
+ if (ret)
+ return ret;
+
+ irq = kmalloc(sizeof(*irq), GFP_KERNEL);
+ desc = &irq->desc;
+ desc->valid_params = valid_params;
+ desc->src_id = src_id;
+ desc->src_index = src_index;
+ desc->dst_id = dst_id;
+ desc->dst_host_irq = dst_host_irq;
+ desc->ia_id = ia_id;
+ desc->vint = vint;
+ desc->global_event = global_event;
+ desc->vint_status_bit = vint_status_bit;
+ desc->secondary_host = s_host;
+ list_add(&irq->list, &info->irqs.list);
+
+ return ret;
}
/**
@@ -1947,15 +2009,46 @@ static int ti_sci_free_irq(const struct ti_sci_handle *handle, u32 valid_params,
u16 dst_host_irq, u16 ia_id, u16 vint,
u16 global_event, u8 vint_status_bit, u8 s_host)
{
+ struct ti_sci_info *info = handle_to_ti_sci_info(handle);
+ struct ti_sci_msg_req_manage_irq irq_desc;
+ struct ti_sci_irq *this_irq;
+ struct list_head *this;
+ int ret;
+
pr_debug("%s: IRQ release with valid_params = 0x%x from src = %d, index = %d, to dst = %d, irq = %d,via ia_id = %d, vint = %d, global event = %d,status_bit = %d\n",
__func__, valid_params, src_id, src_index,
dst_id, dst_host_irq, ia_id, vint, global_event,
vint_status_bit);
- return ti_sci_manage_irq(handle, valid_params, src_id, src_index,
- dst_id, dst_host_irq, ia_id, vint,
- global_event, vint_status_bit, s_host,
- TI_SCI_MSG_FREE_IRQ);
+ ret = ti_sci_manage_irq(handle, valid_params, src_id, src_index,
+ dst_id, dst_host_irq, ia_id, vint,
+ global_event, vint_status_bit, s_host,
+ TI_SCI_MSG_FREE_IRQ);
+
+ if (ret)
+ return ret;
+
+ irq_desc.valid_params = valid_params;
+ irq_desc.src_id = src_id;
+ irq_desc.src_index = src_index;
+ irq_desc.dst_id = dst_id;
+ irq_desc.dst_host_irq = dst_host_irq;
+ irq_desc.ia_id = ia_id;
+ irq_desc.vint = vint;
+ irq_desc.global_event = global_event;
+ irq_desc.vint_status_bit = vint_status_bit;
+ irq_desc.secondary_host = s_host;
+
+ list_for_each(this, &info->irqs.list) {
+ this_irq = list_entry(this, struct ti_sci_irq, list);
+ if (ti_sci_irqs_equal(irq_desc, this_irq->desc)) {
+ list_del(&this_irq->list);
+ kfree(this_irq);
+ break;
+ }
+ }
+
+ return ret;
}
/**
@@ -3266,6 +3359,37 @@ static int tisci_reboot_handler(struct notifier_block *nb, unsigned long mode,
return NOTIFY_BAD;
}
+static int __maybe_unused ti_sci_resume_noirq(struct device *dev)
+{
+ const struct ti_sci_desc *desc = device_get_match_data(dev);
+ struct ti_sci_info *info = dev_get_drvdata(dev);
+ struct ti_sci_msg_req_manage_irq *irq_desc;
+ struct ti_sci_irq *irq;
+ struct list_head *this;
+ int ret = 0;
+
+ if (!desc->restore_irqs || pm_suspend_target_state != PM_SUSPEND_MEM)
+ return ret;
+
+ /* restore irqs */
+ list_for_each(this, &info->irqs.list) {
+ irq = list_entry(this, struct ti_sci_irq, list);
+ irq_desc = &irq->desc;
+ ret |= ti_sci_manage_irq(&info->handle, irq_desc->valid_params,
+ irq_desc->src_id, irq_desc->src_index,
+ irq_desc->dst_id, irq_desc->dst_host_irq,
+ irq_desc->ia_id, irq_desc->vint,
+ irq_desc->global_event, irq_desc->vint_status_bit,
+ irq_desc->secondary_host, TI_SCI_MSG_SET_IRQ);
+ }
+
+ return ret;
+}
+
+static const struct dev_pm_ops ti_sci_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(NULL, ti_sci_resume_noirq)
+};
+
/* Description for K2G */
static const struct ti_sci_desc ti_sci_pmmc_k2g_desc = {
.default_host_id = 2,
@@ -3286,9 +3410,21 @@ static const struct ti_sci_desc ti_sci_pmmc_am654_desc = {
.max_msg_size = 60,
};
+/* Description for J7200 */
+static const struct ti_sci_desc ti_sci_pmmc_j7200_desc = {
+ .default_host_id = 2,
+ /* Conservative duration */
+ .max_rx_timeout_ms = 1000,
+ /* Limited by MBOX_TX_QUEUE_LEN. K2G can handle up to 128 messages! */
+ .max_msgs = 20,
+ .max_msg_size = 64,
+ .restore_irqs = true,
+};
+
static const struct of_device_id ti_sci_of_match[] = {
{.compatible = "ti,k2g-sci", .data = &ti_sci_pmmc_k2g_desc},
{.compatible = "ti,am654-sci", .data = &ti_sci_pmmc_am654_desc},
+ {.compatible = "ti,j7200-sci", .data = &ti_sci_pmmc_j7200_desc},
{ /* Sentinel */ },
};
MODULE_DEVICE_TABLE(of, ti_sci_of_match);
@@ -3415,6 +3551,8 @@ static int ti_sci_probe(struct platform_device *pdev)
info->handle.version.firmware_revision,
info->handle.version.firmware_description);
+ INIT_LIST_HEAD(&info->irqs.list);
+
mutex_lock(&ti_sci_list_mutex);
list_add_tail(&info->node, &ti_sci_list);
mutex_unlock(&ti_sci_list_mutex);
@@ -3435,6 +3573,7 @@ static struct platform_driver ti_sci_driver = {
.name = "ti-sci",
.of_match_table = of_match_ptr(ti_sci_of_match),
.suppress_bind_attrs = true,
+ .pm = &ti_sci_pm_ops,
},
};
module_platform_driver(ti_sci_driver);
--
2.39.2
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