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mailbox: ZynqMP IPI mailbox controller

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This patch is to introduce ZynqMP IPI mailbox controller driver
to use the ZynqMP IPI block as mailboxes.

Signed-off-by: Wendy Liang <wendy.liang@xilinx.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Wendy Liang 2019-02-21 16:36:33 -08:00 committed by Jassi Brar
parent 419d67f3ec
commit 4981b82ba2
4 changed files with 758 additions and 0 deletions
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11
drivers/mailbox/Kconfig
View File

@ -205,4 +205,15 @@ config MTK_CMDQ_MBOX
mailbox driver. The CMDQ is used to help read/write registers with
critical time limitation, such as updating display configuration
during the vblank.
config ZYNQMP_IPI_MBOX
bool "Xilinx ZynqMP IPI Mailbox"
depends on ARCH_ZYNQMP && OF
help
Say yes here to add support for Xilinx IPI mailbox driver.
This mailbox driver is used to send notification or short message
between processors with Xilinx ZynqMP IPI. It will place the
message to the IPI buffer and will access the IPI control
registers to kick the other processor or enquire status.
endif

2
drivers/mailbox/Makefile
View File

@ -44,3 +44,5 @@ obj-$(CONFIG_TEGRA_HSP_MBOX) += tegra-hsp.o
obj-$(CONFIG_STM32_IPCC) += stm32-ipcc.o
obj-$(CONFIG_MTK_CMDQ_MBOX) += mtk-cmdq-mailbox.o
obj-$(CONFIG_ZYNQMP_IPI_MBOX) += zynqmp-ipi-mailbox.o

725
drivers/mailbox/zynqmp-ipi-mailbox.c Normal file
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@ -0,0 +1,725 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx Inter Processor Interrupt(IPI) Mailbox Driver
*
* Copyright (C) 2018 Xilinx, Inc.
*/
#include <linux/arm-smccc.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/mailbox/zynqmp-ipi-message.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
/* IPI agent ID any */
#define IPI_ID_ANY 0xFFUL
/* indicate if ZynqMP IPI mailbox driver uses SMC calls or HVC calls */
#define USE_SMC 0
#define USE_HVC 1
/* Default IPI SMC function IDs */
#define SMC_IPI_MAILBOX_OPEN 0x82001000U
#define SMC_IPI_MAILBOX_RELEASE 0x82001001U
#define SMC_IPI_MAILBOX_STATUS_ENQUIRY 0x82001002U
#define SMC_IPI_MAILBOX_NOTIFY 0x82001003U
#define SMC_IPI_MAILBOX_ACK 0x82001004U
#define SMC_IPI_MAILBOX_ENABLE_IRQ 0x82001005U
#define SMC_IPI_MAILBOX_DISABLE_IRQ 0x82001006U
/* IPI SMC Macros */
#define IPI_SMC_ENQUIRY_DIRQ_MASK 0x00000001UL /* Flag to indicate if
* notification interrupt
* to be disabled.
*/
#define IPI_SMC_ACK_EIRQ_MASK 0x00000001UL /* Flag to indicate if
* notification interrupt
* to be enabled.
*/
/* IPI mailbox status */
#define IPI_MB_STATUS_IDLE 0
#define IPI_MB_STATUS_SEND_PENDING 1
#define IPI_MB_STATUS_RECV_PENDING 2
#define IPI_MB_CHNL_TX 0 /* IPI mailbox TX channel */
#define IPI_MB_CHNL_RX 1 /* IPI mailbox RX channel */
/**
* struct zynqmp_ipi_mchan - Description of a Xilinx ZynqMP IPI mailbox channel
* @is_opened: indicate if the IPI channel is opened
* @req_buf: local to remote request buffer start address
* @resp_buf: local to remote response buffer start address
* @req_buf_size: request buffer size
* @resp_buf_size: response buffer size
* @rx_buf: receive buffer to pass received message to client
* @chan_type: channel type
*/
struct zynqmp_ipi_mchan {
int is_opened;
void __iomem *req_buf;
void __iomem *resp_buf;
void *rx_buf;
size_t req_buf_size;
size_t resp_buf_size;
unsigned int chan_type;
};
/**
* struct zynqmp_ipi_mbox - Description of a ZynqMP IPI mailbox
* platform data.
* @pdata: pointer to the IPI private data
* @dev: device pointer corresponding to the Xilinx ZynqMP
* IPI mailbox
* @remote_id: remote IPI agent ID
* @mbox: mailbox Controller
* @mchans: array for channels, tx channel and rx channel.
* @irq: IPI agent interrupt ID
*/
struct zynqmp_ipi_mbox {
struct zynqmp_ipi_pdata *pdata;
struct device dev;
u32 remote_id;
struct mbox_controller mbox;
struct zynqmp_ipi_mchan mchans[2];
};
/**
* struct zynqmp_ipi_pdata - Description of z ZynqMP IPI agent platform data.
*
* @dev: device pointer corresponding to the Xilinx ZynqMP
* IPI agent
* @irq: IPI agent interrupt ID
* @method: IPI SMC or HVC is going to be used
* @local_id: local IPI agent ID
* @num_mboxes: number of mailboxes of this IPI agent
* @ipi_mboxes: IPI mailboxes of this IPI agent
*/
struct zynqmp_ipi_pdata {
struct device *dev;
int irq;
unsigned int method;
u32 local_id;
int num_mboxes;
struct zynqmp_ipi_mbox *ipi_mboxes;
};
static struct device_driver zynqmp_ipi_mbox_driver = {
.owner = THIS_MODULE,
.name = "zynqmp-ipi-mbox",
};
static void zynqmp_ipi_fw_call(struct zynqmp_ipi_mbox *ipi_mbox,
unsigned long a0, unsigned long a3,
struct arm_smccc_res *res)
{
struct zynqmp_ipi_pdata *pdata = ipi_mbox->pdata;
unsigned long a1, a2;
a1 = pdata->local_id;
a2 = ipi_mbox->remote_id;
if (pdata->method == USE_SMC)
arm_smccc_smc(a0, a1, a2, a3, 0, 0, 0, 0, res);
else
arm_smccc_hvc(a0, a1, a2, a3, 0, 0, 0, 0, res);
}
/**
* zynqmp_ipi_interrupt - Interrupt handler for IPI notification
*
* @irq: Interrupt number
* @data: ZynqMP IPI mailbox platform data.
*
* Return: -EINVAL if there is no instance
* IRQ_NONE if the interrupt is not ours.
* IRQ_HANDLED if the rx interrupt was successfully handled.
*/
static irqreturn_t zynqmp_ipi_interrupt(int irq, void *data)
{
struct zynqmp_ipi_pdata *pdata = data;
struct mbox_chan *chan;
struct zynqmp_ipi_mbox *ipi_mbox;
struct zynqmp_ipi_mchan *mchan;
struct zynqmp_ipi_message *msg;
u64 arg0, arg3;
struct arm_smccc_res res;
int ret, i;
(void)irq;
arg0 = SMC_IPI_MAILBOX_STATUS_ENQUIRY;
arg3 = IPI_SMC_ENQUIRY_DIRQ_MASK;
for (i = 0; i < pdata->num_mboxes; i++) {
ipi_mbox = &pdata->ipi_mboxes[i];
mchan = &ipi_mbox->mchans[IPI_MB_CHNL_RX];
chan = &ipi_mbox->mbox.chans[IPI_MB_CHNL_RX];
zynqmp_ipi_fw_call(ipi_mbox, arg0, arg3, &res);
ret = (int)(res.a0 & 0xFFFFFFFF);
if (ret > 0 && ret & IPI_MB_STATUS_RECV_PENDING) {
if (mchan->is_opened) {
msg = mchan->rx_buf;
msg->len = mchan->req_buf_size;
memcpy_fromio(msg->data, mchan->req_buf,
msg->len);
mbox_chan_received_data(chan, (void *)msg);
return IRQ_HANDLED;
}
}
}
return IRQ_NONE;
}
/**
* zynqmp_ipi_peek_data - Peek to see if there are any rx messages.
*
* @chan: Channel Pointer
*
* Return: 'true' if there is pending rx data, 'false' if there is none.
*/
static bool zynqmp_ipi_peek_data(struct mbox_chan *chan)
{
struct device *dev = chan->mbox->dev;
struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev);
struct zynqmp_ipi_mchan *mchan = chan->con_priv;
int ret;
u64 arg0;
struct arm_smccc_res res;
if (WARN_ON(!ipi_mbox)) {
dev_err(dev, "no platform drv data??\n");
return false;
}
arg0 = SMC_IPI_MAILBOX_STATUS_ENQUIRY;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
ret = (int)(res.a0 & 0xFFFFFFFF);
if (mchan->chan_type == IPI_MB_CHNL_TX) {
/* TX channel, check if the message has been acked
* by the remote, if yes, response is available.
*/
if (ret < 0 || ret & IPI_MB_STATUS_SEND_PENDING)
return false;
else
return true;
} else if (ret > 0 && ret & IPI_MB_STATUS_RECV_PENDING) {
/* RX channel, check if there is message arrived. */
return true;
}
return false;
}
/**
* zynqmp_ipi_last_tx_done - See if the last tx message is sent
*
* @chan: Channel pointer
*
* Return: 'true' is no pending tx data, 'false' if there are any.
*/
static bool zynqmp_ipi_last_tx_done(struct mbox_chan *chan)
{
struct device *dev = chan->mbox->dev;
struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev);
struct zynqmp_ipi_mchan *mchan = chan->con_priv;
int ret;
u64 arg0;
struct arm_smccc_res res;
if (WARN_ON(!ipi_mbox)) {
dev_err(dev, "no platform drv data??\n");
return false;
}
if (mchan->chan_type == IPI_MB_CHNL_TX) {
/* We only need to check if the message been taken
* by the remote in the TX channel
*/
arg0 = SMC_IPI_MAILBOX_STATUS_ENQUIRY;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
/* Check the SMC call status, a0 of the result */
ret = (int)(res.a0 & 0xFFFFFFFF);
if (ret < 0 || ret & IPI_MB_STATUS_SEND_PENDING)
return false;
return true;
}
/* Always true for the response message in RX channel */
return true;
}
/**
* zynqmp_ipi_send_data - Send data
*
* @chan: Channel Pointer
* @data: Message Pointer
*
* Return: 0 if all goes good, else appropriate error messages.
*/
static int zynqmp_ipi_send_data(struct mbox_chan *chan, void *data)
{
struct device *dev = chan->mbox->dev;
struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev);
struct zynqmp_ipi_mchan *mchan = chan->con_priv;
struct zynqmp_ipi_message *msg = data;
u64 arg0;
struct arm_smccc_res res;
if (WARN_ON(!ipi_mbox)) {
dev_err(dev, "no platform drv data??\n");
return -EINVAL;
}
if (mchan->chan_type == IPI_MB_CHNL_TX) {
/* Send request message */
if (msg && msg->len > mchan->req_buf_size) {
dev_err(dev, "channel %d message length %u > max %lu\n",
mchan->chan_type, (unsigned int)msg->len,
mchan->req_buf_size);
return -EINVAL;
}
if (msg && msg->len)
memcpy_toio(mchan->req_buf, msg->data, msg->len);
/* Kick IPI mailbox to send message */
arg0 = SMC_IPI_MAILBOX_NOTIFY;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
} else {
/* Send response message */
if (msg && msg->len > mchan->resp_buf_size) {
dev_err(dev, "channel %d message length %u > max %lu\n",
mchan->chan_type, (unsigned int)msg->len,
mchan->resp_buf_size);
return -EINVAL;
}
if (msg && msg->len)
memcpy_toio(mchan->resp_buf, msg->data, msg->len);
arg0 = SMC_IPI_MAILBOX_ACK;
zynqmp_ipi_fw_call(ipi_mbox, arg0, IPI_SMC_ACK_EIRQ_MASK,
&res);
}
return 0;
}
/**
* zynqmp_ipi_startup - Startup the IPI channel
*
* @chan: Channel pointer
*
* Return: 0 if all goes good, else return corresponding error message
*/
static int zynqmp_ipi_startup(struct mbox_chan *chan)
{
struct device *dev = chan->mbox->dev;
struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev);
struct zynqmp_ipi_mchan *mchan = chan->con_priv;
u64 arg0;
struct arm_smccc_res res;
int ret = 0;
unsigned int nchan_type;
if (mchan->is_opened)
return 0;
/* If no channel has been opened, open the IPI mailbox */
nchan_type = (mchan->chan_type + 1) % 2;
if (!ipi_mbox->mchans[nchan_type].is_opened) {
arg0 = SMC_IPI_MAILBOX_OPEN;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
/* Check the SMC call status, a0 of the result */
ret = (int)(res.a0 & 0xFFFFFFFF);
if (ret < 0) {
dev_err(dev, "SMC to open the IPI channel failed.\n");
return ret;
}
ret = 0;
}
/* If it is RX channel, enable the IPI notification interrupt */
if (mchan->chan_type == IPI_MB_CHNL_RX) {
arg0 = SMC_IPI_MAILBOX_ENABLE_IRQ;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
}
mchan->is_opened = 1;
return ret;
}
/**
* zynqmp_ipi_shutdown - Shutdown the IPI channel
*
* @chan: Channel pointer
*/
static void zynqmp_ipi_shutdown(struct mbox_chan *chan)
{
struct device *dev = chan->mbox->dev;
struct zynqmp_ipi_mbox *ipi_mbox = dev_get_drvdata(dev);
struct zynqmp_ipi_mchan *mchan = chan->con_priv;
u64 arg0;
struct arm_smccc_res res;
unsigned int chan_type;
if (!mchan->is_opened)
return;
/* If it is RX channel, disable notification interrupt */
chan_type = mchan->chan_type;
if (chan_type == IPI_MB_CHNL_RX) {
arg0 = SMC_IPI_MAILBOX_DISABLE_IRQ;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
}
/* Release IPI mailbox if no other channel is opened */
chan_type = (chan_type + 1) % 2;
if (!ipi_mbox->mchans[chan_type].is_opened) {
arg0 = SMC_IPI_MAILBOX_RELEASE;
zynqmp_ipi_fw_call(ipi_mbox, arg0, 0, &res);
}
mchan->is_opened = 0;
}
/* ZynqMP IPI mailbox operations */
static const struct mbox_chan_ops zynqmp_ipi_chan_ops = {
.startup = zynqmp_ipi_startup,
.shutdown = zynqmp_ipi_shutdown,
.peek_data = zynqmp_ipi_peek_data,
.last_tx_done = zynqmp_ipi_last_tx_done,
.send_data = zynqmp_ipi_send_data,
};
/**
* zynqmp_ipi_of_xlate - Translate of phandle to IPI mailbox channel
*
* @mbox: mailbox controller pointer
* @p: phandle pointer
*
* Return: Mailbox channel, else return error pointer.
*/
static struct mbox_chan *zynqmp_ipi_of_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *p)
{
struct mbox_chan *chan;
struct device *dev = mbox->dev;
unsigned int chan_type;
/* Only supports TX and RX channels */
chan_type = p->args[0];
if (chan_type != IPI_MB_CHNL_TX && chan_type != IPI_MB_CHNL_RX) {
dev_err(dev, "req chnl failure: invalid chnl type %u.\n",
chan_type);
return ERR_PTR(-EINVAL);
}
chan = &mbox->chans[chan_type];
return chan;
}
static const struct of_device_id zynqmp_ipi_of_match[] = {
{ .compatible = "xlnx,zynqmp-ipi-mailbox" },
{},
};
MODULE_DEVICE_TABLE(of, zynqmp_ipi_of_match);
/**
* zynqmp_ipi_mbox_get_buf_res - Get buffer resource from the IPI dev node
*
* @node: IPI mbox device child node
* @name: name of the IPI buffer
* @res: pointer to where the resource information will be stored.
*
* Return: 0 for success, negative value for failure
*/
static int zynqmp_ipi_mbox_get_buf_res(struct device_node *node,
const char *name,
struct resource *res)
{
int ret, index;
index = of_property_match_string(node, "reg-names", name);
if (index >= 0) {
ret = of_address_to_resource(node, index, res);
if (ret < 0)
return -EINVAL;
return 0;
}
return -ENODEV;
}
/**
* zynqmp_ipi_mbox_dev_release() - release the existence of a ipi mbox dev
*
* @dev: the ipi mailbox device
*
* This is to avoid the no device release() function kernel warning.
*
*/
static void zynqmp_ipi_mbox_dev_release(struct device *dev)
{
(void)dev;
}
/**
* zynqmp_ipi_mbox_probe - probe IPI mailbox resource from device node
*
* @ipi_mbox: pointer to IPI mailbox private data structure
* @node: IPI mailbox device node
*
* Return: 0 for success, negative value for failure
*/
static int zynqmp_ipi_mbox_probe(struct zynqmp_ipi_mbox *ipi_mbox,
struct device_node *node)
{
struct zynqmp_ipi_mchan *mchan;
struct mbox_chan *chans;
struct mbox_controller *mbox;
struct resource res;
struct device *dev, *mdev;
const char *name;
int ret;
dev = ipi_mbox->pdata->dev;
/* Initialize dev for IPI mailbox */
ipi_mbox->dev.parent = dev;
ipi_mbox->dev.release = NULL;
ipi_mbox->dev.of_node = node;
dev_set_name(&ipi_mbox->dev, "%s", of_node_full_name(node));
dev_set_drvdata(&ipi_mbox->dev, ipi_mbox);
ipi_mbox->dev.release = zynqmp_ipi_mbox_dev_release;
ipi_mbox->dev.driver = &zynqmp_ipi_mbox_driver;
ret = device_register(&ipi_mbox->dev);
if (ret) {
dev_err(dev, "Failed to register ipi mbox dev.\n");
return ret;
}
mdev = &ipi_mbox->dev;
mchan = &ipi_mbox->mchans[IPI_MB_CHNL_TX];
name = "local_request_region";
ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res);
if (!ret) {
mchan->req_buf_size = resource_size(&res);
mchan->req_buf = devm_ioremap(mdev, res.start,
mchan->req_buf_size);
if (IS_ERR(mchan->req_buf)) {
dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
ret = PTR_ERR(mchan->req_buf);
return ret;
}
} else if (ret != -ENODEV) {
dev_err(mdev, "Unmatched resource %s, %d.\n", name, ret);
return ret;
}
name = "remote_response_region";
ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res);
if (!ret) {
mchan->resp_buf_size = resource_size(&res);
mchan->resp_buf = devm_ioremap(mdev, res.start,
mchan->resp_buf_size);
if (IS_ERR(mchan->resp_buf)) {
dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
ret = PTR_ERR(mchan->resp_buf);
return ret;
}
} else if (ret != -ENODEV) {
dev_err(mdev, "Unmatched resource %s.\n", name);
return ret;
}
mchan->rx_buf = devm_kzalloc(mdev,
mchan->resp_buf_size +
sizeof(struct zynqmp_ipi_message),
GFP_KERNEL);
if (!mchan->rx_buf)
return -ENOMEM;
mchan = &ipi_mbox->mchans[IPI_MB_CHNL_RX];
name = "remote_request_region";
ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res);
if (!ret) {
mchan->req_buf_size = resource_size(&res);
mchan->req_buf = devm_ioremap(mdev, res.start,
mchan->req_buf_size);
if (IS_ERR(mchan->req_buf)) {
dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
ret = PTR_ERR(mchan->req_buf);
return ret;
}
} else if (ret != -ENODEV) {
dev_err(mdev, "Unmatched resource %s.\n", name);
return ret;
}
name = "local_response_region";
ret = zynqmp_ipi_mbox_get_buf_res(node, name, &res);
if (!ret) {
mchan->resp_buf_size = resource_size(&res);
mchan->resp_buf = devm_ioremap(mdev, res.start,
mchan->resp_buf_size);
if (IS_ERR(mchan->resp_buf)) {
dev_err(mdev, "Unable to map IPI buffer I/O memory\n");
ret = PTR_ERR(mchan->resp_buf);
return ret;
}
} else if (ret != -ENODEV) {
dev_err(mdev, "Unmatched resource %s.\n", name);
return ret;
}
mchan->rx_buf = devm_kzalloc(mdev,
mchan->resp_buf_size +
sizeof(struct zynqmp_ipi_message),
GFP_KERNEL);
if (!mchan->rx_buf)
return -ENOMEM;
/* Get the IPI remote agent ID */
ret = of_property_read_u32(node, "xlnx,ipi-id", &ipi_mbox->remote_id);
if (ret < 0) {
dev_err(dev, "No IPI remote ID is specified.\n");
return ret;
}
mbox = &ipi_mbox->mbox;
mbox->dev = mdev;
mbox->ops = &zynqmp_ipi_chan_ops;
mbox->num_chans = 2;
mbox->txdone_irq = false;
mbox->txdone_poll = true;
mbox->txpoll_period = 5;
mbox->of_xlate = zynqmp_ipi_of_xlate;
chans = devm_kzalloc(mdev, 2 * sizeof(*chans), GFP_KERNEL);
if (!chans)
return -ENOMEM;
mbox->chans = chans;
chans[IPI_MB_CHNL_TX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_TX];
chans[IPI_MB_CHNL_RX].con_priv = &ipi_mbox->mchans[IPI_MB_CHNL_RX];
ipi_mbox->mchans[IPI_MB_CHNL_TX].chan_type = IPI_MB_CHNL_TX;
ipi_mbox->mchans[IPI_MB_CHNL_RX].chan_type = IPI_MB_CHNL_RX;
ret = devm_mbox_controller_register(mdev, mbox);
if (ret)
dev_err(mdev,
"Failed to register mbox_controller(%d)\n", ret);
else
dev_info(mdev,
"Registered ZynqMP IPI mbox with TX/RX channels.\n");
return ret;
}
/**
* zynqmp_ipi_free_mboxes - Free IPI mailboxes devices
*
* @pdata: IPI private data
*/
static void zynqmp_ipi_free_mboxes(struct zynqmp_ipi_pdata *pdata)
{
struct zynqmp_ipi_mbox *ipi_mbox;
int i;
i = pdata->num_mboxes;
for (; i >= 0; i--) {
ipi_mbox = &pdata->ipi_mboxes[i];
if (ipi_mbox->dev.parent) {
mbox_controller_unregister(&ipi_mbox->mbox);
device_unregister(&ipi_mbox->dev);
}
}
}
static int zynqmp_ipi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *nc, *np = pdev->dev.of_node;
struct zynqmp_ipi_pdata *pdata;
struct zynqmp_ipi_mbox *mbox;
int num_mboxes, ret = -EINVAL;
num_mboxes = of_get_child_count(np);
pdata = devm_kzalloc(dev, sizeof(*pdata) + (num_mboxes * sizeof(*mbox)),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->dev = dev;
/* Get the IPI local agents ID */
ret = of_property_read_u32(np, "xlnx,ipi-id", &pdata->local_id);
if (ret < 0) {
dev_err(dev, "No IPI local ID is specified.\n");
return ret;
}
pdata->num_mboxes = num_mboxes;
pdata->ipi_mboxes = (struct zynqmp_ipi_mbox *)
((char *)pdata + sizeof(*pdata));
mbox = pdata->ipi_mboxes;
for_each_available_child_of_node(np, nc) {
mbox->pdata = pdata;
ret = zynqmp_ipi_mbox_probe(mbox, nc);
if (ret) {
dev_err(dev, "failed to probe subdev.\n");
ret = -EINVAL;
goto free_mbox_dev;
}
mbox++;
}
/* IPI IRQ */
ret = platform_get_irq(pdev, 0);
if (ret < 0) {
dev_err(dev, "unable to find IPI IRQ.\n");
goto free_mbox_dev;
}
pdata->irq = ret;
ret = devm_request_irq(dev, pdata->irq, zynqmp_ipi_interrupt,
IRQF_SHARED, dev_name(dev), pdata);
if (ret) {
dev_err(dev, "IRQ %d is not requested successfully.\n",
pdata->irq);
goto free_mbox_dev;
}
platform_set_drvdata(pdev, pdata);
return ret;
free_mbox_dev:
zynqmp_ipi_free_mboxes(pdata);
return ret;
}
static int zynqmp_ipi_remove(struct platform_device *pdev)
{
struct zynqmp_ipi_pdata *pdata;
pdata = platform_get_drvdata(pdev);
zynqmp_ipi_free_mboxes(pdata);
return 0;
}
static struct platform_driver zynqmp_ipi_driver = {
.probe = zynqmp_ipi_probe,
.remove = zynqmp_ipi_remove,
.driver = {
.name = "zynqmp-ipi",
.of_match_table = of_match_ptr(zynqmp_ipi_of_match),
},
};
static int __init zynqmp_ipi_init(void)
{
return platform_driver_register(&zynqmp_ipi_driver);
}
subsys_initcall(zynqmp_ipi_init);
static void __exit zynqmp_ipi_exit(void)
{
platform_driver_unregister(&zynqmp_ipi_driver);
}
module_exit(zynqmp_ipi_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Xilinx ZynqMP IPI Mailbox driver");
MODULE_AUTHOR("Xilinx Inc.");

20
include/linux/mailbox/zynqmp-ipi-message.h Normal file
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@ -0,0 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_ZYNQMP_IPI_MESSAGE_H_
#define _LINUX_ZYNQMP_IPI_MESSAGE_H_
/**
* struct zynqmp_ipi_message - ZynqMP IPI message structure
* @len: Length of message
* @data: message payload
*
* This is the structure for data used in mbox_send_message
* the maximum length of data buffer is fixed to 12 bytes.
* Client is supposed to be aware of this.
*/
struct zynqmp_ipi_message {
size_t len;
u8 data[0];
};
#endif /* _LINUX_ZYNQMP_IPI_MESSAGE_H_ */