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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-07 10:24:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-07 10:24:07 -0700
commit21c19bc7ee256094aba74af8d91a824da4bc36af (patch)
tree85c058588fc097fe6fd0f00caa200c7bd5ed658e /drivers/mailbox
parentb6ffe9ba46016f8351896ccee33bebcd0e5ea7c0 (diff)
parent25bfee16d5a3158086273cc51110c7470144c842 (diff)
Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar: - Minor improvement : avoid requiring unnecessary startup/shutdown callback that many drivers seem to not need - New controller driver for Qualcomm's APCS IPC * 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: Introduce Qualcomm APCS IPC driver dt-bindings: mailbox: Introduce Qualcomm APCS global binding mailbox: Make startup and shutdown ops optional
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/Kconfig8
-rw-r--r--drivers/mailbox/Makefile2
-rw-r--r--drivers/mailbox/mailbox.c16
-rw-r--r--drivers/mailbox/qcom-apcs-ipc-mailbox.c129
4 files changed, 149 insertions, 6 deletions
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index ee1a3d9147ef..c5731e5e3c6c 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -124,6 +124,14 @@ config MAILBOX_TEST
Test client to help with testing new Controller driver
implementations.
+config QCOM_APCS_IPC
+ tristate "Qualcomm APCS IPC driver"
+ depends on ARCH_QCOM || COMPILE_TEST
+ help
+ Say y here to enable support for the APCS IPC mailbox driver,
+ providing an interface for invoking the inter-process communication
+ signals from the application processor to other masters.
+
config TEGRA_HSP_MBOX
bool "Tegra HSP (Hardware Synchronization Primitives) Driver"
depends on ARCH_TEGRA_186_SOC
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index e2bcb03cd35b..d54e41206e17 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -32,4 +32,6 @@ obj-$(CONFIG_BCM_PDC_MBOX) += bcm-pdc-mailbox.o
obj-$(CONFIG_BCM_FLEXRM_MBOX) += bcm-flexrm-mailbox.o
+obj-$(CONFIG_QCOM_APCS_IPC) += qcom-apcs-ipc-mailbox.o
+
obj-$(CONFIG_TEGRA_HSP_MBOX) += tegra-hsp.o
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index 9dfbf7ea10a2..537f4f6d009b 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -355,11 +355,14 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index)
spin_unlock_irqrestore(&chan->lock, flags);
- ret = chan->mbox->ops->startup(chan);
- if (ret) {
- dev_err(dev, "Unable to startup the chan (%d)\n", ret);
- mbox_free_channel(chan);
- chan = ERR_PTR(ret);
+ if (chan->mbox->ops->startup) {
+ ret = chan->mbox->ops->startup(chan);
+
+ if (ret) {
+ dev_err(dev, "Unable to startup the chan (%d)\n", ret);
+ mbox_free_channel(chan);
+ chan = ERR_PTR(ret);
+ }
}
mutex_unlock(&con_mutex);
@@ -408,7 +411,8 @@ void mbox_free_channel(struct mbox_chan *chan)
if (!chan || !chan->cl)
return;
- chan->mbox->ops->shutdown(chan);
+ if (chan->mbox->ops->shutdown)
+ chan->mbox->ops->shutdown(chan);
/* The queued TX requests are simply aborted, no callbacks are made */
spin_lock_irqsave(&chan->lock, flags);
diff --git a/drivers/mailbox/qcom-apcs-ipc-mailbox.c b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
new file mode 100644
index 000000000000..9924c6d7f05d
--- /dev/null
+++ b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 2017, Linaro Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/mailbox_controller.h>
+
+#define QCOM_APCS_IPC_BITS 32
+
+struct qcom_apcs_ipc {
+ struct mbox_controller mbox;
+ struct mbox_chan mbox_chans[QCOM_APCS_IPC_BITS];
+
+ void __iomem *reg;
+ unsigned long offset;
+};
+
+static int qcom_apcs_ipc_send_data(struct mbox_chan *chan, void *data)
+{
+ struct qcom_apcs_ipc *apcs = container_of(chan->mbox,
+ struct qcom_apcs_ipc, mbox);
+ unsigned long idx = (unsigned long)chan->con_priv;
+
+ writel(BIT(idx), apcs->reg);
+
+ return 0;
+}
+
+static const struct mbox_chan_ops qcom_apcs_ipc_ops = {
+ .send_data = qcom_apcs_ipc_send_data,
+};
+
+static int qcom_apcs_ipc_probe(struct platform_device *pdev)
+{
+ struct qcom_apcs_ipc *apcs;
+ struct resource *res;
+ unsigned long offset;
+ void __iomem *base;
+ unsigned long i;
+ int ret;
+
+ apcs = devm_kzalloc(&pdev->dev, sizeof(*apcs), GFP_KERNEL);
+ if (!apcs)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ offset = (unsigned long)of_device_get_match_data(&pdev->dev);
+
+ apcs->reg = base + offset;
+
+ /* Initialize channel identifiers */
+ for (i = 0; i < ARRAY_SIZE(apcs->mbox_chans); i++)
+ apcs->mbox_chans[i].con_priv = (void *)i;
+
+ apcs->mbox.dev = &pdev->dev;
+ apcs->mbox.ops = &qcom_apcs_ipc_ops;
+ apcs->mbox.chans = apcs->mbox_chans;
+ apcs->mbox.num_chans = ARRAY_SIZE(apcs->mbox_chans);
+
+ ret = mbox_controller_register(&apcs->mbox);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register APCS IPC controller\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, apcs);
+
+ return 0;
+}
+
+static int qcom_apcs_ipc_remove(struct platform_device *pdev)
+{
+ struct qcom_apcs_ipc *apcs = platform_get_drvdata(pdev);
+
+ mbox_controller_unregister(&apcs->mbox);
+
+ return 0;
+}
+
+/* .data is the offset of the ipc register within the global block */
+static const struct of_device_id qcom_apcs_ipc_of_match[] = {
+ { .compatible = "qcom,msm8916-apcs-kpss-global", .data = (void *)8 },
+ { .compatible = "qcom,msm8996-apcs-hmss-global", .data = (void *)16 },
+ {}
+};
+MODULE_DEVICE_TABLE(of, qcom_apcs_ipc_of_match);
+
+static struct platform_driver qcom_apcs_ipc_driver = {
+ .probe = qcom_apcs_ipc_probe,
+ .remove = qcom_apcs_ipc_remove,
+ .driver = {
+ .name = "qcom_apcs_ipc",
+ .of_match_table = qcom_apcs_ipc_of_match,
+ },
+};
+
+static int __init qcom_apcs_ipc_init(void)
+{
+ return platform_driver_register(&qcom_apcs_ipc_driver);
+}
+postcore_initcall(qcom_apcs_ipc_init);
+
+static void __exit qcom_apcs_ipc_exit(void)
+{
+ platform_driver_unregister(&qcom_apcs_ipc_driver);
+}
+module_exit(qcom_apcs_ipc_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Qualcomm APCS IPC driver");

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