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Date: Tue, 6 Aug 2019 18:02:05 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Sudeep Holla <sudeep.holla@....com>, Peng Fan <peng.fan@....com>,
linux-kernel@...r.kernel.org,
Bo Zhang <bozhang.zhang@...adcom.com>,
Jim Quinlan <james.quinlan@...adcom.com>,
Volodymyr Babchuk <volodymyr_babchuk@...m.com>,
Gaku Inami <gaku.inami.xh@...esas.com>,
aidapala@....qualcomm.com, pajay@....qualcomm.com,
Etienne Carriere <etienne.carriere@...aro.org>,
Souvik Chakravarty <Souvik.Chakravarty@....com>,
wesleys@...inx.com, Felix Burton <fburton@...inx.com>,
Saeed Nowshadi <saeed.nowshadi@...inx.com>,
Ionela Voinescu <Ionela.Voinescu@....com>,
Chris Redpath <Chris.Redpath@....com>,
Quentin Perret <Quentin.Perret@....com>
Subject: [PATCH v2 2/5] firmware: arm_scmi: Make use SCMI v2.0 fastchannel for performance protocol
SCMI v2.0 adds support for "FastChannel" which do not use a message
header as they are specialized for a single message.
Only PERFORMANCE_LIMITS_{SET,GET} and PERFORMANCE_LEVEL_{SET,GET}
commands are supported over fastchannels. As they are optional, they
need to be discovered by PERFORMANCE_DESCRIBE_FASTCHANNEL command.
Further {LIMIT,LEVEL}_SET commands can have optional doorbell support.
Add support for making use of these fastchannels.
Cc: Ionela Voinescu <Ionela.Voinescu@....com>
Cc: Chris Redpath <Chris.Redpath@....com>
Cc: Quentin Perret <Quentin.Perret@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
drivers/firmware/arm_scmi/perf.c | 104 +++++++++++++++++++++++++++++--
1 file changed, 100 insertions(+), 4 deletions(-)
v1->v2:
- Changed the macro SCMI_PERF_FC_RING_DB to use do {} while(0)
diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c
index 6cce3e82e81e..fb7f6cab2c11 100644
--- a/drivers/firmware/arm_scmi/perf.c
+++ b/drivers/firmware/arm_scmi/perf.c
@@ -8,6 +8,7 @@
#include <linux/bits.h>
#include <linux/of.h>
#include <linux/io.h>
+#include <linux/io-64-nonatomic-hi-lo.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/sort.h>
@@ -293,7 +294,42 @@ scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
-static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
+#define SCMI_PERF_FC_RING_DB(doorbell, w) \
+do { \
+ u##w val = 0; \
+ struct scmi_fc_db_info *db = doorbell; \
+ \
+ if (db->mask) \
+ val = ioread##w(db->addr) & db->mask; \
+ iowrite##w((u##w)db->set | val, db->addr); \
+} while(0)
+
+static void scmi_perf_fc_ring_db(struct scmi_fc_db_info *db)
+{
+ if (!db || !db->addr)
+ return;
+
+ if (db->width == 1)
+ SCMI_PERF_FC_RING_DB(db, 8);
+ else if (db->width == 2)
+ SCMI_PERF_FC_RING_DB(db, 16);
+ else if (db->width == 4)
+ SCMI_PERF_FC_RING_DB(db, 32);
+ else /* db->width == 8 */
+#ifdef CONFIG_64BIT
+ SCMI_PERF_FC_RING_DB(db, 64);
+#else
+ {
+ u64 val = 0;
+
+ if (db->mask)
+ val = ioread64_hi_lo(db->addr) & db->mask;
+ iowrite64_hi_lo(db->set, db->addr);
+ }
+#endif
+}
+
+static int scmi_perf_mb_limits_set(const struct scmi_handle *handle, u32 domain,
u32 max_perf, u32 min_perf)
{
int ret;
@@ -316,7 +352,23 @@ static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
return ret;
}
-static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
+static int scmi_perf_limits_set(const struct scmi_handle *handle, u32 domain,
+ u32 max_perf, u32 min_perf)
+{
+ struct scmi_perf_info *pi = handle->perf_priv;
+ struct perf_dom_info *dom = pi->dom_info + domain;
+
+ if (dom->fc_info && dom->fc_info->limit_set_addr) {
+ iowrite32(max_perf, dom->fc_info->limit_set_addr);
+ iowrite32(min_perf, dom->fc_info->limit_set_addr + 4);
+ scmi_perf_fc_ring_db(dom->fc_info->limit_set_db);
+ return 0;
+ }
+
+ return scmi_perf_mb_limits_set(handle, domain, max_perf, min_perf);
+}
+
+static int scmi_perf_mb_limits_get(const struct scmi_handle *handle, u32 domain,
u32 *max_perf, u32 *min_perf)
{
int ret;
@@ -342,7 +394,22 @@ static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
-static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
+static int scmi_perf_limits_get(const struct scmi_handle *handle, u32 domain,
+ u32 *max_perf, u32 *min_perf)
+{
+ struct scmi_perf_info *pi = handle->perf_priv;
+ struct perf_dom_info *dom = pi->dom_info + domain;
+
+ if (dom->fc_info && dom->fc_info->limit_get_addr) {
+ *max_perf = ioread32(dom->fc_info->limit_get_addr);
+ *min_perf = ioread32(dom->fc_info->limit_get_addr + 4);
+ return 0;
+ }
+
+ return scmi_perf_mb_limits_get(handle, domain, max_perf, min_perf);
+}
+
+static int scmi_perf_mb_level_set(const struct scmi_handle *handle, u32 domain,
u32 level, bool poll)
{
int ret;
@@ -365,7 +432,22 @@ static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
return ret;
}
-static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
+static int scmi_perf_level_set(const struct scmi_handle *handle, u32 domain,
+ u32 level, bool poll)
+{
+ struct scmi_perf_info *pi = handle->perf_priv;
+ struct perf_dom_info *dom = pi->dom_info + domain;
+
+ if (dom->fc_info && dom->fc_info->level_set_addr) {
+ iowrite32(level, dom->fc_info->level_set_addr);
+ scmi_perf_fc_ring_db(dom->fc_info->level_set_db);
+ return 0;
+ }
+
+ return scmi_perf_mb_level_set(handle, domain, level, poll);
+}
+
+static int scmi_perf_mb_level_get(const struct scmi_handle *handle, u32 domain,
u32 *level, bool poll)
{
int ret;
@@ -387,6 +469,20 @@ static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
return ret;
}
+static int scmi_perf_level_get(const struct scmi_handle *handle, u32 domain,
+ u32 *level, bool poll)
+{
+ struct scmi_perf_info *pi = handle->perf_priv;
+ struct perf_dom_info *dom = pi->dom_info + domain;
+
+ if (dom->fc_info && dom->fc_info->level_get_addr) {
+ *level = ioread32(dom->fc_info->level_get_addr);
+ return 0;
+ }
+
+ return scmi_perf_mb_level_get(handle, domain, level, poll);
+}
+
static bool scmi_perf_fc_size_is_valid(u32 msg, u32 size)
{
if ((msg == PERF_LEVEL_GET || msg == PERF_LEVEL_SET) && size == 4)
--
2.17.1
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