mailbox: omap: Add support for TI K3 SoCs

The TI K3 AM65x and J721E family of SoCs have a new Mailbox IP that
is based on the existing Mailbox IP present in OMAP architecture based
SoCs. Each instance of the legacy OMAP Mailbox IP is now a single cluster
within the newer Mailbox IP instance on K3 architecture based SoCs. A
single K3 Mailbox IP instance has multiple clusters with each cluster
providing the same functionality as the existing OMAP Mailbox IP.

Reuse the existing OMAP Mailbox driver to extend the support for this
newer IP present within the Main NavSS block on K3 SoCs. The K3 family
of SoCs use 64-bit ARMv8 processors for running Linux, so the driver is
also enhanced to deal with the differences between the 32-bit message
payloads and the 64-bit pointers used by the client drivers.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index b709481a8de65498cd9db33c06878fbee21dc9fe..ab4eb750bbddc3c30f67381c9288d0067cd5f8a2 100644 (file)
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -54,7 +54,7 @@ config ARMADA_37XX_RWTM_MBOX
 
 config OMAP2PLUS_MBOX
        tristate "OMAP2+ Mailbox framework support"
-       depends on ARCH_OMAP2PLUS
+       depends on ARCH_OMAP2PLUS || ARCH_K3
        help
          Mailbox implementation for OMAP family chips with hardware for
          interprocessor communication involving DSP, IVA1.0 and IVA2 in

diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
index ca50177a33f29ecd7c4ce4151a5c3b606417256f..a3cd63583cf732a4f8c2338b0dc03546fe8d92d9 100644 (file)
--- a/drivers/mailbox/omap-mailbox.c
+++ b/drivers/mailbox/omap-mailbox.c
@@ -3,7 +3,7 @@
  * OMAP mailbox driver
  *
  * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
- * Copyright (C) 2013-2016 Texas Instruments Incorporated - http://www.ti.com
+ * Copyright (C) 2013-2019 Texas Instruments Incorporated - http://www.ti.com
  *
  * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
  *          Suman Anna <s-anna@ti.com>
@@ -141,14 +141,14 @@ void mbox_write_reg(struct omap_mbox_device *mdev, u32 val, size_t ofs)
 }
 
 /* Mailbox FIFO handle functions */
-static mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
+static u32 mbox_fifo_read(struct omap_mbox *mbox)
 {
        struct omap_mbox_fifo *fifo = &mbox->rx_fifo;
 
-       return (mbox_msg_t)mbox_read_reg(mbox->parent, fifo->msg);
+       return mbox_read_reg(mbox->parent, fifo->msg);
 }
 
-static void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
+static void mbox_fifo_write(struct omap_mbox *mbox, u32 msg)
 {
        struct omap_mbox_fifo *fifo = &mbox->tx_fifo;
 
@@ -256,14 +256,16 @@ static void mbox_rx_work(struct work_struct *work)
 {
        struct omap_mbox_queue *mq =
                        container_of(work, struct omap_mbox_queue, work);
-       mbox_msg_t msg;
+       mbox_msg_t data;
+       u32 msg;
        int len;
 
        while (kfifo_len(&mq->fifo) >= sizeof(msg)) {
                len = kfifo_out(&mq->fifo, (unsigned char *)&msg, sizeof(msg));
                WARN_ON(len != sizeof(msg));
+               data = msg;
 
-               mbox_chan_received_data(mq->mbox->chan, (void *)msg);
+               mbox_chan_received_data(mq->mbox->chan, (void *)data);
                spin_lock_irq(&mq->lock);
                if (mq->full) {
                        mq->full = false;
@@ -286,7 +288,7 @@ static void __mbox_tx_interrupt(struct omap_mbox *mbox)
 static void __mbox_rx_interrupt(struct omap_mbox *mbox)
 {
        struct omap_mbox_queue *mq = mbox->rxq;
-       mbox_msg_t msg;
+       u32 msg;
        int len;
 
        while (!mbox_fifo_empty(mbox)) {
@@ -540,13 +542,13 @@ static void omap_mbox_chan_shutdown(struct mbox_chan *chan)
        mutex_unlock(&mdev->cfg_lock);
 }
 
-static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
+static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, u32 msg)
 {
        int ret = -EBUSY;
 
        if (!mbox_fifo_full(mbox)) {
                _omap_mbox_enable_irq(mbox, IRQ_RX);
-               mbox_fifo_write(mbox, (mbox_msg_t)data);
+               mbox_fifo_write(mbox, msg);
                ret = 0;
                _omap_mbox_disable_irq(mbox, IRQ_RX);
 
@@ -558,12 +560,12 @@ static int omap_mbox_chan_send_noirq(struct omap_mbox *mbox, void *data)
        return ret;
 }
 
-static int omap_mbox_chan_send(struct omap_mbox *mbox, void *data)
+static int omap_mbox_chan_send(struct omap_mbox *mbox, u32 msg)
 {
        int ret = -EBUSY;
 
        if (!mbox_fifo_full(mbox)) {
-               mbox_fifo_write(mbox, (mbox_msg_t)data);
+               mbox_fifo_write(mbox, msg);
                ret = 0;
        }
 
@@ -576,14 +578,15 @@ static int omap_mbox_chan_send_data(struct mbox_chan *chan, void *data)
 {
        struct omap_mbox *mbox = mbox_chan_to_omap_mbox(chan);
        int ret;
+       u32 msg = omap_mbox_message(data);
 
        if (!mbox)
                return -EINVAL;
 
        if (mbox->send_no_irq)
-               ret = omap_mbox_chan_send_noirq(mbox, data);
+               ret = omap_mbox_chan_send_noirq(mbox, msg);
        else
-               ret = omap_mbox_chan_send(mbox, data);
+               ret = omap_mbox_chan_send(mbox, msg);
 
        return ret;
 }
@@ -656,6 +659,10 @@ static const struct of_device_id omap_mailbox_of_match[] = {
                .compatible     = "ti,omap4-mailbox",
                .data           = &omap4_data,
        },
+       {
+               .compatible     = "ti,am654-mailbox",
+               .data           = &omap4_data,
+       },
        {
                /* end */
        },
@@ -830,7 +837,10 @@ static int omap_mbox_probe(struct platform_device *pdev)
        mdev->intr_type = intr_type;
        mdev->mboxes = list;
 
-       /* OMAP does not have a Tx-Done IRQ, but rather a Tx-Ready IRQ */
+       /*
+        * OMAP/K3 Mailbox IP does not have a Tx-Done IRQ, but rather a Tx-Ready
+        * IRQ and is needed to run the Tx state machine
+        */
        mdev->controller.txdone_irq = true;
        mdev->controller.dev = mdev->dev;
        mdev->controller.ops = &omap_mbox_chan_ops;
@@ -899,9 +909,8 @@ static int __init omap_mbox_init(void)
                return err;
 
        /* kfifo size sanity check: alignment and minimal size */
-       mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(mbox_msg_t));
-       mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size,
-                                                       sizeof(mbox_msg_t));
+       mbox_kfifo_size = ALIGN(mbox_kfifo_size, sizeof(u32));
+       mbox_kfifo_size = max_t(unsigned int, mbox_kfifo_size, sizeof(u32));
 
        err = platform_driver_register(&omap_mbox_driver);
        if (err)

diff --git a/include/linux/omap-mailbox.h b/include/linux/omap-mailbox.h
index 6dbcd2da03328c4ba83cfb9c2e8bc833312e5d4e..8aa984ec1f38b8f57d00cbd82a3cfa3d4018104c 100644 (file)
--- a/include/linux/omap-mailbox.h
+++ b/include/linux/omap-mailbox.h
@@ -6,7 +6,9 @@
 #ifndef OMAP_MAILBOX_H
 #define OMAP_MAILBOX_H
 
-typedef u32 mbox_msg_t;
+typedef uintptr_t mbox_msg_t;
+
+#define omap_mbox_message(data) (u32)(mbox_msg_t)(data)
 
 typedef int __bitwise omap_mbox_irq_t;
 #define IRQ_TX ((__force omap_mbox_irq_t) 1)