From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bjorn Andersson Subject: [PATCH v3] rpmsg: qcom_smd: Access APCS through mailbox framework Date: Thu, 19 Apr 2018 18:17:57 -0700 Message-Id: <20180420011757.22389-1-bjorn.andersson@linaro.org> To: Rob Herring , Bjorn Andersson Cc: Mark Rutland , Ohad Ben-Cohen , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-remoteproc@vger.kernel.org, Nicolas Dechesne List-ID: 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. Reviewed-by: Arun Kumar Neelakantam Signed-off-by: Bjorn Andersson --- Changes since v2: - Added comment about mbox_send_message() return value. .../devicetree/bindings/soc/qcom/qcom,smd.txt | 8 ++- drivers/rpmsg/Kconfig | 1 + drivers/rpmsg/qcom_smd.c | 67 ++++++++++++++++------ 3 files changed, 56 insertions(+), 20 deletions(-) diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt index ea1dc75ec9ea..234ae2256501 100644 --- a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt @@ -22,9 +22,15 @@ The edge is described by the following properties: Definition: should specify the IRQ used by the remote processor to signal this processor about communication related updates -- qcom,ipc: +- mboxes: Usage: required Value type: + Definition: reference to the associated doorbell in APCS, as described + in mailbox/mailbox.txt + +- qcom,ipc: + Usage: required, unless mboxes is specified + Value type: Definition: three entries specifying the outgoing ipc bit used for signaling the remote processor: - phandle to a syscon node representing the apcs registers diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig index 0fe6eac46512..2e4fb4ffd562 100644 --- a/drivers/rpmsg/Kconfig +++ b/drivers/rpmsg/Kconfig @@ -39,6 +39,7 @@ config RPMSG_QCOM_GLINK_SMEM config RPMSG_QCOM_SMD tristate "Qualcomm Shared Memory Driver (SMD)" + depends on MAILBOX depends on QCOM_SMEM select RPMSG help diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c index bc0b30657230..3ff271a44bef 100644 --- a/drivers/rpmsg/qcom_smd.c +++ b/drivers/rpmsg/qcom_smd.c @@ -14,6 +14,7 @@ #include #include +#include #include #include #include @@ -107,6 +108,8 @@ static const struct { * @ipc_regmap: regmap handle holding the outgoing ipc register * @ipc_offset: offset within @ipc_regmap of the register for ipc * @ipc_bit: bit in the register at @ipc_offset of @ipc_regmap + * @mbox_client: mailbox client handle + * @mbox_chan: apcs ipc mailbox channel handle * @channels: list of all channels detected on this edge * @channels_lock: guard for modifications of @channels * @allocated: array of bitmaps representing already allocated channels @@ -129,6 +132,9 @@ struct qcom_smd_edge { int ipc_offset; int ipc_bit; + struct mbox_client mbox_client; + struct mbox_chan *mbox_chan; + struct list_head channels; spinlock_t channels_lock; @@ -366,7 +372,17 @@ static void qcom_smd_signal_channel(struct qcom_smd_channel *channel) { struct qcom_smd_edge *edge = channel->edge; - regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); + if (edge->mbox_chan) { + /* + * We can ignore a failing mbox_send_message() as the only + * possible cause is that the FIFO in the framework is full of + * other writes to the same bit. + */ + mbox_send_message(edge->mbox_chan, NULL); + mbox_client_txdone(edge->mbox_chan, 0); + } else { + regmap_write(edge->ipc_regmap, edge->ipc_offset, BIT(edge->ipc_bit)); + } } /* @@ -1326,27 +1342,37 @@ static int qcom_smd_parse_edge(struct device *dev, key = "qcom,remote-pid"; of_property_read_u32(node, key, &edge->remote_pid); - syscon_np = of_parse_phandle(node, "qcom,ipc", 0); - if (!syscon_np) { - dev_err(dev, "no qcom,ipc node\n"); - return -ENODEV; - } + edge->mbox_client.dev = dev; + edge->mbox_client.knows_txdone = true; + edge->mbox_chan = mbox_request_channel(&edge->mbox_client, 0); + if (IS_ERR(edge->mbox_chan)) { + if (PTR_ERR(edge->mbox_chan) != -ENODEV) + return PTR_ERR(edge->mbox_chan); - edge->ipc_regmap = syscon_node_to_regmap(syscon_np); - if (IS_ERR(edge->ipc_regmap)) - return PTR_ERR(edge->ipc_regmap); + edge->mbox_chan = NULL; - key = "qcom,ipc"; - ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); - if (ret < 0) { - dev_err(dev, "no offset in %s\n", key); - return -EINVAL; - } + syscon_np = of_parse_phandle(node, "qcom,ipc", 0); + if (!syscon_np) { + dev_err(dev, "no qcom,ipc node\n"); + return -ENODEV; + } - ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); - if (ret < 0) { - dev_err(dev, "no bit in %s\n", key); - return -EINVAL; + edge->ipc_regmap = syscon_node_to_regmap(syscon_np); + if (IS_ERR(edge->ipc_regmap)) + return PTR_ERR(edge->ipc_regmap); + + key = "qcom,ipc"; + ret = of_property_read_u32_index(node, key, 1, &edge->ipc_offset); + if (ret < 0) { + dev_err(dev, "no offset in %s\n", key); + return -EINVAL; + } + + ret = of_property_read_u32_index(node, key, 2, &edge->ipc_bit); + if (ret < 0) { + dev_err(dev, "no bit in %s\n", key); + return -EINVAL; + } } ret = of_property_read_string(node, "label", &edge->name); @@ -1452,6 +1478,8 @@ struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent, return edge; unregister_dev: + if (!IS_ERR_OR_NULL(edge->mbox_chan)) + mbox_free_channel(edge->mbox_chan); put_device(&edge->dev); return ERR_PTR(ret); } @@ -1480,6 +1508,7 @@ int qcom_smd_unregister_edge(struct qcom_smd_edge *edge) if (ret) dev_warn(&edge->dev, "can't remove smd device: %d\n", ret); + mbox_free_channel(edge->mbox_chan); device_unregister(&edge->dev); return 0; -- 2.16.2