Sleep and wake requests are sent when the application processor
subsystem of the SoC is entering deep sleep states like in suspend.
These requests help lower the system power requirements when the
resources are not in use.
Sleep and wake requests are written to the TCS slots but are not
triggered at the time of writing. The TCS are triggered by the
firmware
after the last of the CPUs has executed its WFI. Since these requests
may come in different batches of requests, it is the job of this
controller driver to find and arrange the requests into the available
TCSes.
Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
Reviewed-by: Evan Green <evgreen@xxxxxxxxxxxx>
---
Changes in v7:
- Bug fix in find_match()
---
drivers/soc/qcom/rpmh-internal.h | 8 +++
drivers/soc/qcom/rpmh-rsc.c | 118
+++++++++++++++++++++++++++++++
2 files changed, 126 insertions(+)
diff --git a/drivers/soc/qcom/rpmh-internal.h
b/drivers/soc/qcom/rpmh-internal.h
index d9a21726e568..6e19fe458c31 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -14,6 +14,7 @@
#define MAX_CMDS_PER_TCS 16
#define MAX_TCS_PER_TYPE 3
#define MAX_TCS_NR (MAX_TCS_PER_TYPE * TCS_TYPE_NR)
+#define MAX_TCS_SLOTS (MAX_CMDS_PER_TCS * MAX_TCS_PER_TYPE)
#define RPMH_MAX_CTRLR 2
struct rsc_drv;
@@ -30,6 +31,8 @@ struct rsc_drv;
* @ncpt: number of commands in each TCS
* @lock: lock for synchronizing this TCS writes
* @req: requests that are sent from the TCS
+ * @cmd_cache: flattened cache of cmds in sleep/wake TCS
+ * @slots: indicates which of @cmd_addr are occupied
*/
struct tcs_group {
struct rsc_drv *drv;
@@ -40,6 +43,8 @@ struct tcs_group {
int ncpt;
spinlock_t lock;
const struct tcs_request *req[MAX_TCS_PER_TYPE];
+ u32 *cmd_cache;
+ DECLARE_BITMAP(slots, MAX_TCS_SLOTS);
};
/**
@@ -69,6 +74,9 @@ struct rsc_drv {
extern struct list_head rsc_drv_list;
int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request
*msg);
+int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv,
+ const struct tcs_request *msg);
+int rpmh_rsc_invalidate(struct rsc_drv *drv);
void rpmh_tx_done(const struct tcs_request *msg, int r);
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 33270b1d5991..4e2144a14c31 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -113,6 +113,12 @@ static struct tcs_group *get_tcs_for_msg(struct
rsc_drv *drv,
case RPMH_ACTIVE_ONLY_STATE:
type = ACTIVE_TCS;
break;
+ case RPMH_WAKE_ONLY_STATE:
+ type = WAKE_TCS;
+ break;
+ case RPMH_SLEEP_STATE:
+ type = SLEEP_TCS;
+ break;
default:
return ERR_PTR(-EINVAL);
}
@@ -353,6 +359,105 @@ int rpmh_rsc_send_data(struct rsc_drv *drv,
const struct tcs_request *msg)
}
EXPORT_SYMBOL(rpmh_rsc_send_data);
+static int find_match(const struct tcs_group *tcs, const struct
tcs_cmd *cmd,
+ int len)
+{
+ int i, j;
+
+ /* Check for already cached commands */
+ for_each_set_bit(i, tcs->slots, MAX_TCS_SLOTS) {
+ if (tcs->cmd_cache[i] != cmd[0].addr)
+ continue;
+ for (j = 0; j < len; j++) {
+ if (tcs->cmd_cache[i + j] != cmd[j].addr) {
