On 11/16/2017 12:48 PM, Bjorn Andersson wrote:
Attempt to acquire the APCS IPC through the mailbox framework and fall
back to the old syscon based approach, to allow us to move away from
using the syscon.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
drivers/soc/qcom/Kconfig | 1 +
drivers/soc/qcom/smp2p.c | 38 ++++++++++++++++++++++++++++++++------
2 files changed, 33 insertions(+), 6 deletions(-)
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index b00bccddcd3b..e67d9534fca0 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -64,6 +64,7 @@ config QCOM_SMEM_STATE
config QCOM_SMP2P
tristate "Qualcomm Shared Memory Point to Point support"
+ depends on MAILBOX
depends on QCOM_SMEM
select QCOM_SMEM_STATE
help
diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
index f51fb2ea7200..7fdbb64142a0 100644
--- a/drivers/soc/qcom/smp2p.c
+++ b/drivers/soc/qcom/smp2p.c
@@ -18,6 +18,7 @@
#include <linux/of.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
+#include <linux/mailbox_client.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -126,6 +127,8 @@ struct smp2p_entry {
* @ipc_regmap: regmap for the outbound ipc
* @ipc_offset: offset within the regmap
* @ipc_bit: bit in regmap@offset to kick to signal remote processor
+ * @mbox_client: mailbox client handle
+ * @mbox_chan: apcs ipc mailbox channel handle
* @inbound: list of inbound entries
* @outbound: list of outbound entries
*/
@@ -146,6 +149,9 @@ struct qcom_smp2p {
int ipc_offset;
int ipc_bit;
+ struct mbox_client mbox_client;
+ struct mbox_chan *mbox_chan;
+
struct list_head inbound;
struct list_head outbound;
};
@@ -154,7 +160,13 @@ static void qcom_smp2p_kick(struct qcom_smp2p *smp2p)
{
/* Make sure any updated data is written before the kick */
wmb();
- regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
+
+ if (smp2p->mbox_chan) {
+ mbox_send_message(smp2p->mbox_chan, NULL);
+ mbox_client_txdone(smp2p->mbox_chan, 0);
+ } else {
+ regmap_write(smp2p->ipc_regmap, smp2p->ipc_offset, BIT(smp2p->ipc_bit));
+ }
}
/**
@@ -453,10 +465,6 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, smp2p);
- ret = smp2p_parse_ipc(smp2p);
- if (ret)
- return ret;
-
key = "qcom,smem";
ret = of_property_read_u32_array(pdev->dev.of_node, key,
smp2p->smem_items, 2);
@@ -483,9 +491,22 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
return irq;
}
+ smp2p->mbox_client.dev = &pdev->dev;
+ smp2p->mbox_chan = mbox_request_channel(&smp2p->mbox_client, 0);
any reason why we are not using "knows_txdone = true" for SMP2P but
using for only SMD drivers
+ if (IS_ERR(smp2p->mbox_chan)) {
+ if (PTR_ERR(smp2p->mbox_chan) != -ENODEV)
+ return PTR_ERR(smp2p->mbox_chan);
+
+ smp2p->mbox_chan = NULL;
+
+ ret = smp2p_parse_ipc(smp2p);
+ if (ret)
+ return ret;
+ }
+
ret = qcom_smp2p_alloc_outbound_item(smp2p);
if (ret < 0)
- return ret;
+ goto release_mbox;
for_each_available_child_of_node(pdev->dev.of_node, node) {
entry = devm_kzalloc(&pdev->dev, sizeof(*entry), GFP_KERNEL);
@@ -540,6 +561,9 @@ static int qcom_smp2p_probe(struct platform_device *pdev)
smp2p->out->valid_entries = 0;
+release_mbox:
+ mbox_free_channel(smp2p->mbox_chan);
+
return ret;
}
@@ -554,6 +578,8 @@ static int qcom_smp2p_remove(struct platform_device *pdev)
list_for_each_entry(entry, &smp2p->outbound, node)
qcom_smem_state_unregister(entry->state);
+ mbox_free_channel(smp2p->mbox_chan);
+
smp2p->out->valid_entries = 0;
return 0;
--
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