diff options
| -rw-r--r-- | drivers/mailbox/Kconfig | 11 | ||||
| -rw-r--r-- | drivers/mailbox/Makefile | 2 | ||||
| -rw-r--r-- | drivers/mailbox/zynqmp-ipi-mailbox.c | 725 | ||||
| -rw-r--r-- | include/linux/mailbox/zynqmp-ipi-message.h | 20 |
4 files changed, 758 insertions, 0 deletions
diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig index 3eeb12e93e98..d86e7a4ac04d 100644 --- a/drivers/mailbox/Kconfig +++ b/drivers/mailbox/Kconfig @@ -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 diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile index c818b5d011ae..8be3bcbcf882 100644 --- a/drivers/mailbox/Makefile +++ b/drivers/mailbox/Makefile @@ -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 diff --git a/drivers/mailbox/zynqmp-ipi-mailbox.c b/drivers/mailbox/zynqmp-ipi-mailbox.c new file mode 100644 index 000000000000..86887c9a349a --- /dev/null +++ b/drivers/mailbox/zynqmp-ipi-mailbox.c @@ -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."); diff --git a/include/linux/mailbox/zynqmp-ipi-message.h b/include/linux/mailbox/zynqmp-ipi-message.h new file mode 100644 index 000000000000..9542b41eacfd --- /dev/null +++ b/include/linux/mailbox/zynqmp-ipi-message.h @@ -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_ */ |