The bcm74110 mailbox driver is used to communicate with
a co-processor for various power management and firmware
related tasks.
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
---
v2
Fixed minor formatting issues
Fixed error check of platform_get_irq()
Removed offsetted base iomem vars. Instead we just offset directly
from base.
Removed shmem variable. Hardcode it instead.
drivers/mailbox/Kconfig | 10 +
drivers/mailbox/Makefile | 2 +
drivers/mailbox/bcm74110-mailbox.c | 655 +++++++++++++++++++++++++++++
3 files changed, 667 insertions(+)
create mode 100644 drivers/mailbox/bcm74110-mailbox.c
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index ed52db272f4d..6fe3356ddde5 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -330,4 +330,14 @@ config THEAD_TH1520_MBOX
kernel is running, and E902 core used for power management among other
things.
+config BCM74110_MAILBOX
+ tristate "Brcmstb BCM74110 Mailbox"
+ depends on ARCH_BRCMSTB || COMPILE_TEST
+ default ARCH_BRCMSTB
+ help
+ Broadcom STB mailbox driver present starting with brcmstb bcm74110
+ SoCs. The mailbox is a communication channel between the host
+ processor and coprocessor that handles various power management task
+ and more.
+
endif
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 9a1542b55539..eb2e8f55bd15 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -70,3 +70,5 @@ obj-$(CONFIG_QCOM_CPUCP_MBOX) += qcom-cpucp-mbox.o
obj-$(CONFIG_QCOM_IPCC) += qcom-ipcc.o
obj-$(CONFIG_THEAD_TH1520_MBOX) += mailbox-th1520.o
+
+obj-$(CONFIG_BCM74110_MAILBOX) += bcm74110-mailbox.o
diff --git a/drivers/mailbox/bcm74110-mailbox.c b/drivers/mailbox/bcm74110-mailbox.c
new file mode 100644
index 000000000000..04600f2b075e
--- /dev/null
+++ b/drivers/mailbox/bcm74110-mailbox.c
@@ -0,0 +1,655 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Broadcom BCM74110 Mailbox Driver
+ *
+ * Copyright (c) 2025 Broadcom
+ */
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+#include <linux/io-64-nonatomic-hi-lo.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/delay.h>
+#include <linux/mailbox_controller.h>
+#include <linux/bitfield.h>
+
+#define BCM_MBOX_BASE(sel) ((sel) * 0x40)
+#define BCM_MBOX_IRQ_BASE(sel) (((sel) * 0x20) + 0x800)
+
+#define BCM_MBOX_CFGA 0x0
+#define BCM_MBOX_CFGB 0x4
+#define BCM_MBOX_CFGC 0x8
+#define BCM_MBOX_CFGD 0xc
+#define BCM_MBOX_CTRL 0x10
+#define BCM_MBOX_CTRL_EN BIT(0)
+#define BCM_MBOX_CTRL_CLR BIT(1)
+#define BCM_MBOX_STATUS0 0x14
+#define BCM_MBOX_STATUS0_NOT_EMPTY BIT(28)
+#define BCM_MBOX_STATUS0_FULL BIT(29)
+#define BCM_MBOX_STATUS1 0x18
+#define BCM_MBOX_STATUS2 0x1c
+#define BCM_MBOX_WDATA 0x20
+#define BCM_MBOX_RDATA 0x28
+
+#define BCM_MBOX_IRQ_STATUS 0x0
+#define BCM_MBOX_IRQ_SET 0x4
+#define BCM_MBOX_IRQ_CLEAR 0x8
+#define BCM_MBOX_IRQ_MASK_STATUS 0xc
+#define BCM_MBOX_IRQ_MASK_SET 0x10
+#define BCM_MBOX_IRQ_MASK_CLEAR 0x14
+#define BCM_MBOX_IRQ_TIMEOUT BIT(0)
+#define BCM_MBOX_IRQ_NOT_EMPTY BIT(1)
+#define BCM_MBOX_IRQ_FULL BIT(2)
+#define BCM_MBOX_IRQ_LOW_WM BIT(3)
+#define BCM_MBOX_IRQ_HIGH_WM BIT(4)
+
+#define BCM_LINK_CODE0 0xbe0
+#define BCM_LINK_CODE1 0xbe1
+#define BCM_LINK_CODE2 0xbe2
+
+enum {
+ BCM_MSG_FUNC_LINK_START = 0,
+ BCM_MSG_FUNC_LINK_STOP,
+ BCM_MSG_FUNC_SHMEM_TX,
+ BCM_MSG_FUNC_SHMEM_RX,
+ BCM_MSG_FUNC_SHMEM_STOP,
+ BCM_MSG_FUNC_MAX,
+};
+
+enum {
+ BCM_MSG_SVC_INIT = 0,
+ BCM_MSG_SVC_PMC,
+ BCM_MSG_SVC_SCMI,
+ BCM_MSG_SVC_DPFE,
+ BCM_MSG_SVC_MAX,
+};
+
+struct bcm74110_mbox_msg {
+ struct list_head list_entry;
+#define BCM_MSG_VERSION_MASK GENMASK(31, 29)
+#define BCM_MSG_VERSION 0x1
+#define BCM_MSG_REQ_MASK BIT(28)
+#define BCM_MSG_RPLY_MASK BIT(27)
+#define BCM_MSG_SVC_MASK GENMASK(26, 24)
+#define BCM_MSG_FUNC_MASK GENMASK(23, 16)
+#define BCM_MSG_LENGTH_MASK GENMASK(15, 4)
+#define BCM_MSG_SLOT_MASK GENMASK(3, 0)
+
+#define BCM_MSG_SET_FIELD(hdr, field, val) \
+ do { \
+ hdr &= ~BCM_MSG_##field##_MASK; \
+ hdr |= FIELD_PREP(BCM_MSG_##field##_MASK, val); \
+ } while (0)
+
+#define BCM_MSG_GET_FIELD(hdr, field) \
+ FIELD_GET(BCM_MSG_##field##_MASK, hdr)
+ u32 msg;
+};
+
+struct bcm74110_mbox_chan {
+ struct bcm74110_mbox *mbox;
+ bool en;
+ int slot;
+ int type;
+};
+
+struct bcm74110_mbox {
+ struct platform_device *pdev;
+ void __iomem *base;
+
+ int tx_chan;
+ int rx_chan;
+ int rx_irq;
+ struct list_head rx_svc_init_list;
+ spinlock_t rx_svc_list_lock;
+
+ struct mbox_controller controller;
+ struct bcm74110_mbox_chan *mbox_chan;
+};
+
+#define BCM74110_OFFSET_IO_WRITEL_MACRO(name, offset_base) \
+static void bcm74110_##name##_writel(struct bcm74110_mbox *mbox,\
+ u32 val, u32 off) \
+{ \
+ writel_relaxed(val, mbox->base + offset_base + off); \
+}
+BCM74110_OFFSET_IO_WRITEL_MACRO(tx, BCM_MBOX_BASE(mbox->tx_chan));
+BCM74110_OFFSET_IO_WRITEL_MACRO(irq, BCM_MBOX_IRQ_BASE(mbox->rx_chan));
+
+#define BCM74110_OFFSET_IO_READL_MACRO(name, offset_base) \
+static u32 bcm74110_##name##_readl(struct bcm74110_mbox *mbox, \
+ u32 off) \
+{ \
+ return readl_relaxed(mbox->base + offset_base + off); \
+}
+BCM74110_OFFSET_IO_READL_MACRO(tx, BCM_MBOX_BASE(mbox->tx_chan));
+BCM74110_OFFSET_IO_READL_MACRO(rx, BCM_MBOX_BASE(mbox->rx_chan));
+BCM74110_OFFSET_IO_READL_MACRO(irq, BCM_MBOX_IRQ_BASE(mbox->rx_chan));
+
+static inline struct bcm74110_mbox *bcm74110_mbox_from_cntrl(
+ struct mbox_controller *cntrl)
+{
+ return container_of(cntrl, struct bcm74110_mbox, controller);
+}
+
+static void bcm74110_rx_push_init_msg(struct bcm74110_mbox *mbox, u32 val)
+{
+ struct bcm74110_mbox_msg *msg;
+
+ msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
+ if (!msg)
+ return;
+
+ INIT_LIST_HEAD(&msg->list_entry);
+ msg->msg = val;
+
+ spin_lock(&mbox->rx_svc_list_lock);
+ list_add_tail(&msg->list_entry, &mbox->rx_svc_init_list);
+ spin_unlock(&mbox->rx_svc_list_lock);
+}
+
+static void bcm74110_rx_process_msg(struct bcm74110_mbox *mbox)
+{
+ struct device *dev = &mbox->pdev->dev;
+ struct bcm74110_mbox_chan *chan_priv;
+ struct mbox_chan *chan;
+ u32 msg, status;
+ int type;
+
+ do {
+ msg = bcm74110_rx_readl(mbox, BCM_MBOX_RDATA);
+ status = bcm74110_rx_readl(mbox, BCM_MBOX_STATUS0);
+
+ dev_dbg(dev, "rx: [{req=%lu|rply=%lu|srv=%lu|fn=%lu|length=%lu|slot=%lu]\n",
+ BCM_MSG_GET_FIELD(msg, REQ), BCM_MSG_GET_FIELD(msg, RPLY),
+ BCM_MSG_GET_FIELD(msg, SVC), BCM_MSG_GET_FIELD(msg, FUNC),
+ BCM_MSG_GET_FIELD(msg, LENGTH), BCM_MSG_GET_FIELD(msg, SLOT));
+
+ type = BCM_MSG_GET_FIELD(msg, SVC);
+ switch (type) {
+ case BCM_MSG_SVC_INIT:
+ bcm74110_rx_push_init_msg(mbox, msg);
+ break;
+ case BCM_MSG_SVC_PMC:
+ case BCM_MSG_SVC_SCMI:
+ case BCM_MSG_SVC_DPFE:
+ chan = &mbox->controller.chans[type];
+ chan_priv = chan->con_priv;
+ if (chan_priv->en)
+ mbox_chan_received_data(chan, NULL);
+ else
+ dev_warn(dev, "Channel not enabled\n");
+ break;
+ default:
+ dev_warn(dev, "Unsupported msg received\n");
+ }
+ } while (status & BCM_MBOX_STATUS0_NOT_EMPTY);
+}
+
+static irqreturn_t bcm74110_mbox_isr(int irq, void *data)
+{
+ struct bcm74110_mbox *mbox = data;
+ u32 status;
+
+ status = bcm74110_irq_readl(mbox, BCM_MBOX_IRQ_STATUS);
+
+ bcm74110_irq_writel(mbox, 0xffffffff, BCM_MBOX_IRQ_CLEAR);
+
+ if (status & BCM_MBOX_IRQ_NOT_EMPTY)
+ bcm74110_rx_process_msg(mbox);
+ else
+ dev_warn(&mbox->pdev->dev, "Spurious interrupt\n");
+
+ return IRQ_HANDLED;
+}
+
+static void bcm74110_mbox_mask_and_clear(struct bcm74110_mbox *mbox)
+{
+ bcm74110_irq_writel(mbox, 0xffffffff, BCM_MBOX_IRQ_MASK_SET);
+ bcm74110_irq_writel(mbox, 0xffffffff, BCM_MBOX_IRQ_CLEAR);
+}
+
+static int bcm74110_rx_pop_init_msg(struct bcm74110_mbox *mbox, u32 func_type,
+ u32 *val)
+{
+ struct bcm74110_mbox_msg *msg, *msg_tmp;
+ unsigned long flags;
+ bool found = false;
+
+ spin_lock_irqsave(&mbox->rx_svc_list_lock, flags);
+ list_for_each_entry_safe(msg, msg_tmp, &mbox->rx_svc_init_list,
+ list_entry) {
+ if (BCM_MSG_GET_FIELD(msg->msg, FUNC) == func_type) {
+ list_del(&msg->list_entry);
+ found = true;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&mbox->rx_svc_list_lock, flags);
+
+ if (!found)
+ return -EINVAL;
+
+ *val = msg->msg;
+ kfree(msg);
+
+ return 0;
+}
+
+static void bcm74110_rx_flush_msg(struct bcm74110_mbox *mbox)
+{
+ struct bcm74110_mbox_msg *msg, *msg_tmp;
+ LIST_HEAD(list_temp);
+ unsigned long flags;
+
+ spin_lock_irqsave(&mbox->rx_svc_list_lock, flags);
+ list_splice_init(&mbox->rx_svc_init_list, &list_temp);
+ spin_unlock_irqrestore(&mbox->rx_svc_list_lock, flags);
+
+ list_for_each_entry_safe(msg, msg_tmp, &list_temp, list_entry) {
+ list_del(&msg->list_entry);
+ kfree(msg);
+ }
+}
+
+#define BCM_DEQUEUE_TIMEOUT_MS 30
+static int bcm74110_rx_pop_init_msg_block(struct bcm74110_mbox *mbox, u32 func_type,
+ u32 *val)
+{
+ int ret, timeout = 0;
+
+ do {
+ ret = bcm74110_rx_pop_init_msg(mbox, func_type, val);
+
+ if (!ret)
+ return 0;
+
+ /* TODO: Figure out what is a good sleep here. */
+ usleep_range(1000, 2000);
+ timeout++;
+ } while (timeout < BCM_DEQUEUE_TIMEOUT_MS);
+
+ dev_warn(&mbox->pdev->dev, "Timeout waiting for service init response\n");
+ return -ETIMEDOUT;
+}
+
+static int bcm74110_mbox_create_msg(int req, int rply, int svc, int func,
+ int length, int slot)
+{
+ u32 msg = 0;
+
+ BCM_MSG_SET_FIELD(msg, REQ, req);
+ BCM_MSG_SET_FIELD(msg, RPLY, rply);
+ BCM_MSG_SET_FIELD(msg, SVC, svc);
+ BCM_MSG_SET_FIELD(msg, FUNC, func);
+ BCM_MSG_SET_FIELD(msg, LENGTH, length);
+ BCM_MSG_SET_FIELD(msg, SLOT, slot);
+
+ return msg;
+}
+
+static int bcm74110_mbox_tx_msg(struct bcm74110_mbox *mbox, u32 msg)
+{
+ int val;
+
+ /* We can potentially poll with timeout here instead */
+ val = bcm74110_tx_readl(mbox, BCM_MBOX_STATUS0);
+ if (val & BCM_MBOX_STATUS0_FULL) {
+ dev_err(&mbox->pdev->dev, "Mailbox full\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(&mbox->pdev->dev, "tx: [{req=%lu|rply=%lu|srv=%lu|fn=%lu|length=%lu|slot=%lu]\n",
+ BCM_MSG_GET_FIELD(msg, REQ), BCM_MSG_GET_FIELD(msg, RPLY),
+ BCM_MSG_GET_FIELD(msg, SVC), BCM_MSG_GET_FIELD(msg, FUNC),
+ BCM_MSG_GET_FIELD(msg, LENGTH), BCM_MSG_GET_FIELD(msg, SLOT));
+
+ bcm74110_tx_writel(mbox, msg, BCM_MBOX_WDATA);
+
+ return 0;
+}
+
+#define BCM_MBOX_LINK_TRAINING_RETRIES 5
+static int bcm74110_mbox_link_training(struct bcm74110_mbox *mbox)
+{
+ int ret, retries = 0;
+ u32 msg = 0, orig_len = 0, len = BCM_LINK_CODE0;
+
+ do {
+ switch (len) {
+ case 0:
+ retries++;
+ dev_warn(&mbox->pdev->dev,
+ "Link train failed, trying again... %d\n",
+ retries);
+ if (retries > BCM_MBOX_LINK_TRAINING_RETRIES)
+ return -EINVAL;
+ len = BCM_LINK_CODE0;
+ fallthrough;
+ case BCM_LINK_CODE0:
+ case BCM_LINK_CODE1:
+ case BCM_LINK_CODE2:
+ msg = bcm74110_mbox_create_msg(1, 0, BCM_MSG_SVC_INIT,
+ BCM_MSG_FUNC_LINK_START,
+ len, BCM_MSG_SVC_INIT);
+ break;
+ default:
+ break;
+ }
+
+ bcm74110_mbox_tx_msg(mbox, msg);
+
+ /* No response expected for LINK_CODE2 */
+ if (len == BCM_LINK_CODE2)
+ return 0;
+
+ orig_len = len;
+
+ ret = bcm74110_rx_pop_init_msg_block(mbox,
+ BCM_MSG_GET_FIELD(msg, FUNC),
+ &msg);
+ if (ret) {
+ len = 0;
+ continue;
+ }
+
+ if ((BCM_MSG_GET_FIELD(msg, SVC) != BCM_MSG_SVC_INIT) ||
+ (BCM_MSG_GET_FIELD(msg, FUNC) != BCM_MSG_FUNC_LINK_START) ||
+ (BCM_MSG_GET_FIELD(msg, SLOT) != 0) ||
+ (BCM_MSG_GET_FIELD(msg, RPLY) != 1) ||
+ (BCM_MSG_GET_FIELD(msg, REQ) != 0)) {
+ len = 0;
+ continue;
+ }
+
+ len = BCM_MSG_GET_FIELD(msg, LENGTH);
+
+ /* Make sure sequence is good */
+ if (len != (orig_len + 1)) {
+ len = 0;
+ continue;
+ }
+ } while (1);
+
+ return -EINVAL;
+}
+
+static int bcm74110_mbox_tx_msg_and_wait_ack(struct bcm74110_mbox *mbox, u32 msg)
+{
+ int ret;
+ u32 recv_msg;
+
+ ret = bcm74110_mbox_tx_msg(mbox, msg);
+ if (ret)
+ return ret;
+
+ ret = bcm74110_rx_pop_init_msg_block(mbox, BCM_MSG_GET_FIELD(msg, FUNC),
+ &recv_msg);
+ if (ret)
+ return ret;
+
+ /*
+ * Modify tx message to verify rx ack.
+ * Flip RPLY/REQ for synchronous messages
+ */
+ if (BCM_MSG_GET_FIELD(msg, REQ) == 1) {
+ BCM_MSG_SET_FIELD(msg, RPLY, 1);
+ BCM_MSG_SET_FIELD(msg, REQ, 0);
+ }
+
+ if (msg != recv_msg) {
+ dev_err(&mbox->pdev->dev, "Found ack, but ack is invalid\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* Each index points to 0x100 of HAB MEM. IDX size counts from 0 */
+#define BCM_MBOX_HAB_MEM_IDX_START 0x30
+#define BCM_MBOX_HAB_MEM_IDX_SIZE 0x0
+static int bcm74110_mbox_shmem_init(struct bcm74110_mbox *mbox)
+{
+ u32 msg = 0;
+ int ret;
+
+ msg = bcm74110_mbox_create_msg(1, 0, BCM_MSG_SVC_INIT,
+ BCM_MSG_FUNC_SHMEM_STOP,
+ 0, BCM_MSG_SVC_INIT);
+ ret = bcm74110_mbox_tx_msg_and_wait_ack(mbox, msg);
+ if (ret)
+ return -EINVAL;
+
+ msg = bcm74110_mbox_create_msg(1, 0, BCM_MSG_SVC_INIT,
+ BCM_MSG_FUNC_SHMEM_TX,
+ BCM_MBOX_HAB_MEM_IDX_START,
+ BCM_MBOX_HAB_MEM_IDX_SIZE);
+ ret = bcm74110_mbox_tx_msg_and_wait_ack(mbox, msg);
+ if (ret)
+ return -EINVAL;
+
+ msg = bcm74110_mbox_create_msg(1, 0, BCM_MSG_SVC_INIT,
+ BCM_MSG_FUNC_SHMEM_RX,
+ BCM_MBOX_HAB_MEM_IDX_START,
+ BCM_MBOX_HAB_MEM_IDX_SIZE);
+ ret = bcm74110_mbox_tx_msg_and_wait_ack(mbox, msg);
+ if (ret)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int bcm74110_mbox_init(struct bcm74110_mbox *mbox)
+{
+ int ret = 0;
+
+ /* Disable queues tx/rx */
+ bcm74110_tx_writel(mbox, 0x0, BCM_MBOX_CTRL);
+
+ /* Clear status & restart tx/rx*/
+ bcm74110_tx_writel(mbox, BCM_MBOX_CTRL_EN | BCM_MBOX_CTRL_CLR,
+ BCM_MBOX_CTRL);
+
+ /* Unmask irq */
+ bcm74110_irq_writel(mbox, BCM_MBOX_IRQ_NOT_EMPTY, BCM_MBOX_IRQ_MASK_CLEAR);
+
+ ret = bcm74110_mbox_link_training(mbox);
+ if (ret) {
+ dev_err(&mbox->pdev->dev, "Training failed\n");
+ return ret;
+ }
+
+ return bcm74110_mbox_shmem_init(mbox);
+}
+
+static int bcm74110_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+ struct bcm74110_mbox_chan *chan_priv = chan->con_priv;
+ u32 msg;
+
+ switch (chan_priv->type) {
+ case BCM_MSG_SVC_PMC:
+ case BCM_MSG_SVC_SCMI:
+ case BCM_MSG_SVC_DPFE:
+ msg = bcm74110_mbox_create_msg(1, 0, chan_priv->type, 0,
+ 128 + 28, chan_priv->slot);
+ break;
+ default:
+ return -EINVAL;
+ };
+
+ return bcm74110_mbox_tx_msg(chan_priv->mbox, msg);
+}
+
+static int bcm74110_mbox_chan_startup(struct mbox_chan *chan)
+{
+ struct bcm74110_mbox_chan *chan_priv = chan->con_priv;
+
+ chan_priv->en = true;
+
+ return 0;
+}
+
+static void bcm74110_mbox_chan_shutdown(struct mbox_chan *chan)
+{
+ struct bcm74110_mbox_chan *chan_priv = chan->con_priv;
+
+ chan_priv->en = false;
+}
+
+static const struct mbox_chan_ops bcm74110_mbox_chan_ops = {
+ .send_data = bcm74110_mbox_send_data,
+ .startup = bcm74110_mbox_chan_startup,
+ .shutdown = bcm74110_mbox_chan_shutdown,
+};
+
+static void bcm74110_mbox_shutdown(struct platform_device *pdev)
+{
+ struct bcm74110_mbox *mbox = dev_get_drvdata(&pdev->dev);
+ u32 msg;
+
+ msg = bcm74110_mbox_create_msg(1, 0, BCM_MSG_SVC_INIT,
+ BCM_MSG_FUNC_LINK_STOP,
+ 0, 0);
+
+ bcm74110_mbox_tx_msg_and_wait_ack(mbox, msg);
+
+ /* Even if we don't receive ACK, lets shut it down */
+
+ bcm74110_mbox_mask_and_clear(mbox);
+
+ /* Disable queues tx/rx */
+ bcm74110_tx_writel(mbox, 0x0, BCM_MBOX_CTRL);
+
+ /* Flush queues */
+ bcm74110_rx_flush_msg(mbox);
+}
+
+static struct mbox_chan *bcm74110_mbox_of_xlate(struct mbox_controller *cntrl,
+ const struct of_phandle_args *p)
+{
+ struct bcm74110_mbox *mbox = bcm74110_mbox_from_cntrl(cntrl);
+ struct device *dev = &mbox->pdev->dev;
+ struct bcm74110_mbox_chan *chan_priv;
+ int slot, type;
+
+ if (p->args_count != 2) {
+ dev_err(dev, "Invalid arguments\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ type = p->args[0];
+ slot = p->args[1];
+
+ switch (type) {
+ case BCM_MSG_SVC_PMC:
+ case BCM_MSG_SVC_SCMI:
+ case BCM_MSG_SVC_DPFE:
+ if (slot > BCM_MBOX_HAB_MEM_IDX_SIZE) {
+ dev_err(dev, "Not enough shared memory\n");
+ return ERR_PTR(-EINVAL);
+ }
+ chan_priv = cntrl->chans[type].con_priv;
+ chan_priv->slot = slot;
+ chan_priv->type = type;
+ break;
+ default:
+ dev_err(dev, "Invalid channel type: %d\n", type);
+ return ERR_PTR(-EINVAL);
+ };
+
+ return &cntrl->chans[type];
+}
+
+static int bcm74110_mbox_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct bcm74110_mbox *mbox;
+ int i, ret;
+
+ mbox = devm_kzalloc(dev, sizeof(*mbox), GFP_KERNEL);
+ if (!mbox)
+ return -ENOMEM;
+
+ mbox->pdev = pdev;
+ platform_set_drvdata(pdev, mbox);
+
+ mbox->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(mbox->base))
+ return dev_err_probe(dev, PTR_ERR(mbox->base), "Failed to iomap\n");
+
+ ret = of_property_read_u32(dev->of_node, "brcm,tx", &mbox->tx_chan);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to find tx channel\n");
+
+ ret = of_property_read_u32(dev->of_node, "brcm,rx", &mbox->rx_chan);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to find rx channel\n");
+
+ mbox->rx_irq = platform_get_irq(pdev, 0);
+ if (mbox->rx_irq < 0)
+ return mbox->rx_irq;
+
+ INIT_LIST_HEAD(&mbox->rx_svc_init_list);
+ spin_lock_init(&mbox->rx_svc_list_lock);
+ bcm74110_mbox_mask_and_clear(mbox);
+
+ ret = devm_request_irq(dev, mbox->rx_irq, bcm74110_mbox_isr,
+ IRQF_NO_SUSPEND, pdev->name, mbox);
+ if (ret)
+ return dev_err_probe(dev, ret, "Failed to request irq\n");
+
+ mbox->controller.ops = &bcm74110_mbox_chan_ops;
+ mbox->controller.dev = dev;
+ mbox->controller.num_chans = BCM_MSG_SVC_MAX;
+ mbox->controller.of_xlate = &bcm74110_mbox_of_xlate;
+ mbox->controller.chans = devm_kcalloc(dev, BCM_MSG_SVC_MAX,
+ sizeof(*mbox->controller.chans),
+ GFP_KERNEL);
+ if (!mbox->controller.chans)
+ return -ENOMEM;
+
+ mbox->mbox_chan = devm_kcalloc(dev, BCM_MSG_SVC_MAX,
+ sizeof(*mbox->mbox_chan),
+ GFP_KERNEL);
+ if (!mbox->mbox_chan)
+ return -ENOMEM;
+
+ for (i = 0; i < BCM_MSG_SVC_MAX; i++) {
+ mbox->mbox_chan[i].mbox = mbox;
+ mbox->controller.chans[i].con_priv = &mbox->mbox_chan[i];
+ }
+
+ ret = devm_mbox_controller_register(dev, &mbox->controller);
+ if (ret)
+ return ret;
+
+ ret = bcm74110_mbox_init(mbox);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct of_device_id bcm74110_mbox_of_match[] = {
+ { .compatible = "brcm,bcm74110-mbox", },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, bcm74110_mbox_of_match);
+
+static struct platform_driver bcm74110_mbox_driver = {
+ .driver = {
+ .name = "bcm74110-mbox",
+ .of_match_table = bcm74110_mbox_of_match,
+ },
+ .probe = bcm74110_mbox_probe,
+ .shutdown = bcm74110_mbox_shutdown,
+};
+module_platform_driver(bcm74110_mbox_driver);
+
+MODULE_AUTHOR("Justin Chen <justin.chen@braodcom.com>");
+MODULE_DESCRIPTION("BCM74110 mailbox driver");
+MODULE_LICENSE("GPL");
--
2.34.1© 2016 - 2025 Red Hat, Inc.