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    Subject[PATCH v4 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver
    Date
    R5 is included in Xilinx Zynq UltraScale MPSoC so by adding this
    remotproc driver, we can boot the R5 sub-system in different
    configurations.

    Acked-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
    Acked-by: Ben Levinsky <ben.levinsky@xilinx.com>
    Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
    Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>
    Signed-off-by: Wendy Liang <wendy.liang@xilinx.com>
    Signed-off-by: Michal Simek <michal.simek@xilinx.com>
    Signed-off-by: Ed Mooring <ed.mooring@xilinx.com>
    Signed-off-by: Jason Wu <j.wu@xilinx.com>
    Tested-by: Ben Levinsky <ben.levinsky@xilinx.com>
    ---
    Changes since v1:
    - remove domain struct as per review from Mathieu
    Changes since v2:
    - add xilinx-related platform mgmt fn's instead of wrapping around
    function pointer in xilinx eemi ops struct
    Changes since v3:
    - fix formatting from checpatch.pl --strict
    - update commit message

    ---
    drivers/remoteproc/Kconfig | 10 +
    drivers/remoteproc/Makefile | 1 +
    drivers/remoteproc/zynqmp_r5_remoteproc.c | 902 ++++++++++++++++++++++++++++++
    3 files changed, 913 insertions(+)
    create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c

    diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
    index fbaed07..f094c84 100644
    --- a/drivers/remoteproc/Kconfig
    +++ b/drivers/remoteproc/Kconfig
    @@ -222,6 +222,16 @@ config ST_REMOTEPROC
    processor framework.
    This can be either built-in or a loadable module.

    +config ZYNQMP_R5_REMOTEPROC
    + tristate "ZynqMP_r5 remoteproc support"
    + depends on ARM64 && PM && ARCH_ZYNQMP
    + select RPMSG_VIRTIO
    + select MAILBOX
    + select ZYNQMP_IPI_MBOX
    + help
    + Say y here to support ZynqMP R5 remote processors via the remote
    + processor framework.
    +
    config ST_SLIM_REMOTEPROC
    tristate

    diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
    index 0effd38..806ac3f 100644
    --- a/drivers/remoteproc/Makefile
    +++ b/drivers/remoteproc/Makefile
    @@ -27,5 +27,6 @@ obj-$(CONFIG_QCOM_WCNSS_PIL) += qcom_wcnss_pil.o
    qcom_wcnss_pil-y += qcom_wcnss.o
    qcom_wcnss_pil-y += qcom_wcnss_iris.o
    obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
    +obj-$(CONFIG_ZYNQMP_R5_REMOTEPROC) += zynqmp_r5_remoteproc.o
    obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
    obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
    diff --git a/drivers/remoteproc/zynqmp_r5_remoteproc.c b/drivers/remoteproc/zynqmp_r5_remoteproc.c
    new file mode 100644
    index 0000000..e3fb4fb
    --- /dev/null
    +++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c
    @@ -0,0 +1,902 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Zynq R5 Remote Processor driver
    + *
    + * Copyright (C) 2015 - 2018 Xilinx Inc.
    + * Copyright (C) 2015 Jason Wu <j.wu@xilinx.com>
    + *
    + * Based on origin OMAP and Zynq Remote Processor driver
    + *
    + * Copyright (C) 2012 Michal Simek <monstr@monstr.eu>
    + * Copyright (C) 2012 PetaLogix
    + * Copyright (C) 2011 Texas Instruments, Inc.
    + * Copyright (C) 2011 Google, Inc.
    + */
    +
    +#include <linux/atomic.h>
    +#include <linux/cpu.h>
    +#include <linux/dma-mapping.h>
    +#include <linux/delay.h>
    +#include <linux/err.h>
    +#include <linux/firmware/xlnx-zynqmp.h>
    +#include <linux/genalloc.h>
    +#include <linux/idr.h>
    +#include <linux/interrupt.h>
    +#include <linux/kernel.h>
    +#include <linux/list.h>
    +#include <linux/mailbox_client.h>
    +#include <linux/mailbox/zynqmp-ipi-message.h>
    +#include <linux/module.h>
    +#include <linux/of_address.h>
    +#include <linux/of_irq.h>
    +#include <linux/of_platform.h>
    +#include <linux/of_reserved_mem.h>
    +#include <linux/pfn.h>
    +#include <linux/platform_device.h>
    +#include <linux/remoteproc.h>
    +#include <linux/skbuff.h>
    +#include <linux/slab.h>
    +#include <linux/sysfs.h>
    +
    +#include "remoteproc_internal.h"
    +
    +#define MAX_RPROCS 2 /* Support up to 2 RPU */
    +#define MAX_MEM_PNODES 4 /* Max power nodes for one RPU memory instance */
    +
    +#define DEFAULT_FIRMWARE_NAME "rproc-rpu-fw"
    +
    +/* PM proc states */
    +#define PM_PROC_STATE_ACTIVE 1U
    +
    +/* IPI buffer MAX length */
    +#define IPI_BUF_LEN_MAX 32U
    +/* RX mailbox client buffer max length */
    +#define RX_MBOX_CLIENT_BUF_MAX (IPI_BUF_LEN_MAX + \
    + sizeof(struct zynqmp_ipi_message))
    +
    +static bool autoboot __read_mostly;
    +
    +/**
    + * struct zynqmp_r5_mem - zynqmp rpu memory data
    + * @pnode_id: TCM power domain ids
    + * @res: memory resource
    + * @node: list node
    + */
    +struct zynqmp_r5_mem {
    + u32 pnode_id[MAX_MEM_PNODES];
    + struct resource res;
    + struct list_head node;
    +};
    +
    +/**
    + * struct zynqmp_r5_pdata - zynqmp rpu remote processor private data
    + * @dev: device of RPU instance
    + * @rproc: rproc handle
    + * @pnode_id: RPU CPU power domain id
    + * @mems: memory resources
    + * @is_r5_mode_set: indicate if r5 operation mode is set
    + * @tx_mc: tx mailbox client
    + * @rx_mc: rx mailbox client
    + * @tx_chan: tx mailbox channel
    + * @rx_chan: rx mailbox channel
    + * @workqueue: workqueue for the RPU remoteproc
    + * @tx_mc_skbs: socket buffers for tx mailbox client
    + * @rx_mc_buf: rx mailbox client buffer to save the rx message
    + */
    +struct zynqmp_r5_pdata {
    + struct device dev;
    + struct rproc *rproc;
    + u32 pnode_id;
    + struct list_head mems;
    + bool is_r5_mode_set;
    + struct mbox_client tx_mc;
    + struct mbox_client rx_mc;
    + struct mbox_chan *tx_chan;
    + struct mbox_chan *rx_chan;
    + struct work_struct workqueue;
    + struct sk_buff_head tx_mc_skbs;
    + unsigned char rx_mc_buf[RX_MBOX_CLIENT_BUF_MAX];
    +};
    +
    +/**
    + * table of RPUs
    + */
    +struct zynqmp_r5_pdata rpus[MAX_RPROCS];
    +/**
    + * RPU core configuration
    + */
    +enum rpu_oper_mode rpu_mode;
    +
    +/*
    + * r5_set_mode - set RPU operation mode
    + * @pdata: Remote processor private data
    + *
    + * set RPU oepration mode
    + *
    + * Return: 0 for success, negative value for failure
    + */
    +static int r5_set_mode(struct zynqmp_r5_pdata *pdata)
    +{
    + u32 val[PAYLOAD_ARG_CNT] = {0}, expect;
    + struct device *dev = &pdata->dev;
    + int ret;
    +
    + if (pdata->is_r5_mode_set)
    + return 0;
    + expect = (u32)rpu_mode;
    + ret = zynqmp_pm_get_rpu_mode(pdata->pnode_id, 0, 0, val);
    + if (ret < 0) {
    + dev_err(dev, "failed to get RPU oper mode.\n");
    + return ret;
    + }
    + if (val[0] == expect) {
    + dev_dbg(dev, "RPU mode matches: %x\n", val[0]);
    + } else {
    + ret = zynqmp_pm_set_rpu_mode(pdata->pnode_id,
    + expect, 0, val);
    + if (ret < 0) {
    + dev_err(dev,
    + "failed to set RPU oper mode.\n");
    + return ret;
    + }
    + }
    + if (expect == (u32)PM_RPU_MODE_LOCKSTEP)
    + expect = (u32)PM_RPU_TCM_COMB;
    + else
    + expect = (u32)PM_RPU_TCM_SPLIT;
    + ret = zynqmp_pm_set_tcm_config(pdata->pnode_id,
    + expect, 0, val);
    + if (ret < 0) {
    + dev_err(dev, "failed to config TCM to %x.\n",
    + expect);
    + return ret;
    + }
    + pdata->is_r5_mode_set = true;
    + return 0;
    +}
    +
    +/**
    + * r5_is_running - check if r5 is running
    + * @pdata: Remote processor private data
    + *
    + * check if R5 is running
    + *
    + * Return: true if r5 is running, false otherwise
    + */
    +static bool r5_is_running(struct zynqmp_r5_pdata *pdata)
    +{
    + u32 status, requirements, usage;
    + struct device *dev = &pdata->dev;
    +
    + if (zynqmp_pm_get_node_status(pdata->pnode_id,
    + &status, &requirements, &usage)) {
    + dev_err(dev, "Failed to get RPU node %d status.\n",
    + pdata->pnode_id);
    + return false;
    + } else if (status != PM_PROC_STATE_ACTIVE) {
    + dev_dbg(dev, "RPU is not running.\n");
    + return false;
    + }
    +
    + dev_dbg(dev, "RPU is running.\n");
    + return true;
    +}
    +
    +/*
    + * ZynqMP R5 remoteproc memory release function
    + */
    +static int zynqmp_r5_mem_release(struct rproc *rproc,
    + struct rproc_mem_entry *mem)
    +{
    + struct zynqmp_r5_mem *priv;
    + int i, ret;
    + struct device *dev = &rproc->dev;
    +
    + priv = mem->priv;
    + if (!priv)
    + return 0;
    + for (i = 0; i < MAX_MEM_PNODES; i++) {
    + if (priv->pnode_id[i]) {
    + dev_dbg(dev, "%s, pnode %d\n",
    + __func__, priv->pnode_id[i]);
    + ret = zynqmp_pm_release_node(priv->pnode_id[i]);
    + if (ret < 0) {
    + dev_err(dev,
    + "failed to release power node: %u\n",
    + priv->pnode_id[i]);
    + return ret;
    + }
    + } else {
    + break;
    + }
    + }
    + return 0;
    +}
    +
    +/*
    + * ZynqMP R5 remoteproc operations
    + */
    +static int zynqmp_r5_rproc_start(struct rproc *rproc)
    +{
    + struct device *dev = rproc->dev.parent;
    + struct zynqmp_r5_pdata *local = rproc->priv;
    + enum rpu_boot_mem bootmem;
    + int ret;
    + /* Set up R5 */
    + ret = r5_set_mode(local);
    + if (ret) {
    + dev_err(dev, "failed to set R5 operation mode.\n");
    + return ret;
    + }
    + if ((rproc->bootaddr & 0xF0000000) == 0xF0000000)
    + bootmem = PM_RPU_BOOTMEM_HIVEC;
    + else
    + bootmem = PM_RPU_BOOTMEM_LOVEC;
    + dev_info(dev, "RPU boot from %s.",
    + bootmem == PM_RPU_BOOTMEM_HIVEC ? "OCM" : "TCM");
    + ret = zynqmp_pm_request_wakeup(local->pnode_id, 1,
    + bootmem, ZYNQMP_PM_REQUEST_ACK_NO);
    + if (ret < 0) {
    + dev_err(dev, "failed to boot R5.\n");
    + return ret;
    + }
    + return 0;
    +}
    +
    +static int zynqmp_r5_rproc_stop(struct rproc *rproc)
    +{
    + struct zynqmp_r5_pdata *local = rproc->priv;
    + int ret;
    +
    + ret = zynqmp_pm_force_powerdown(local->pnode_id,
    + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
    + if (ret < 0) {
    + dev_err(&local->dev, "failed to shutdown R5.\n");
    + return ret;
    + }
    + local->is_r5_mode_set = false;
    + return 0;
    +}
    +
    +static int zynqmp_r5_parse_fw(struct rproc *rproc, const struct firmware *fw)
    +{
    + int num_mems, i, ret;
    + struct zynqmp_r5_pdata *pdata = rproc->priv;
    + struct device *dev = &pdata->dev;
    + struct device_node *np = dev->of_node;
    + struct rproc_mem_entry *mem;
    + struct device_node *child;
    + struct resource rsc;
    +
    + num_mems = of_count_phandle_with_args(np, "memory-region", NULL);
    + if (num_mems <= 0)
    + return 0;
    +
    + for (i = 0; i < num_mems; i++) {
    + struct device_node *node;
    + struct zynqmp_r5_mem *zynqmp_mem;
    + struct reserved_mem *rmem;
    +
    + node = of_parse_phandle(np, "memory-region", i);
    + rmem = of_reserved_mem_lookup(node);
    + if (!rmem) {
    + dev_err(dev, "unable to acquire memory-region\n");
    + return -EINVAL;
    + }
    + if (strstr(node->name, "vdev") &&
    + strstr(node->name, "buffer")) {
    + int id;
    + char name[16];
    +
    + id = node->name[8] - '0';
    + snprintf(name, sizeof(name), "vdev%dbuffer", id);
    + /* Register DMA region */
    + mem = rproc_mem_entry_init(dev, NULL,
    + (dma_addr_t)rmem->base,
    + rmem->size, rmem->base,
    + NULL, NULL,
    + name);
    + if (!mem) {
    + dev_err(dev, "unable to initialize memory-region %s\n",
    + node->name);
    + return -ENOMEM;
    + }
    + dev_dbg(dev, "parsed %s at %llx\r\n", mem->name,
    + mem->dma);
    + rproc_add_carveout(rproc, mem);
    + continue;
    + } else if (strstr(node->name, "vdev") &&
    + strstr(node->name, "vring")) {
    + int id, vring_id;
    + char name[16];
    +
    + id = node->name[8] - '0';
    + vring_id = node->name[14] - '0';
    + snprintf(name, sizeof(name), "vdev%dvring%d", id,
    + vring_id);
    + /* Register vring */
    + mem = rproc_mem_entry_init(dev, NULL,
    + (dma_addr_t)rmem->base,
    + rmem->size, rmem->base,
    + NULL, NULL,
    + name);
    + mem->va = devm_ioremap_wc(dev, rmem->base, rmem->size);
    + if (!mem->va)
    + return -ENOMEM;
    + if (!mem) {
    + dev_err(dev, "unable to initialize memory-region %s\n",
    + node->name);
    + return -ENOMEM;
    + }
    + dev_dbg(dev, "parsed %s at %llx\r\n", mem->name,
    + mem->dma);
    + rproc_add_carveout(rproc, mem);
    + continue;
    + } else {
    + mem = rproc_of_resm_mem_entry_init(dev, i,
    + rmem->size,
    + rmem->base,
    + node->name);
    + if (!mem) {
    + dev_err(dev, "unable to initialize memory-region %s\n",
    + node->name);
    + return -ENOMEM;
    + }
    + mem->va = devm_ioremap_wc(dev, rmem->base, rmem->size);
    + if (!mem->va)
    + return -ENOMEM;
    +
    + rproc_add_carveout(rproc, mem);
    + }
    + if (!mem)
    + return -ENOMEM;
    +
    + /*
    + * It is non-DMA memory, used for firmware loading.
    + * It will be added to the R5 remoteproc mappings later.
    + */
    + zynqmp_mem = devm_kzalloc(dev, sizeof(*zynqmp_mem), GFP_KERNEL);
    + if (!zynqmp_mem)
    + return -ENOMEM;
    + ret = of_address_to_resource(node, 0, &zynqmp_mem->res);
    + if (ret) {
    + dev_err(dev, "unable to resolve memory region.\n");
    + return ret;
    + }
    + list_add_tail(&zynqmp_mem->node, &pdata->mems);
    + dev_dbg(dev, "%s, non-dma mem %s\n",
    + __func__, of_node_full_name(node));
    + }
    +
    + /* map TCM memories */
    + for_each_available_child_of_node(np, child) {
    + struct property *prop;
    + const __be32 *cur;
    + u32 pnode_id;
    + void *va;
    + dma_addr_t dma;
    + resource_size_t size;
    +
    + ret = of_address_to_resource(child, 0, &rsc);
    +
    + i = 0;
    + of_property_for_each_u32(child, "pnode-id", prop, cur,
    + pnode_id) {
    + ret = zynqmp_pm_request_node(pnode_id,
    + ZYNQMP_PM_CAPABILITY_ACCESS, 0,
    + ZYNQMP_PM_REQUEST_ACK_BLOCKING);
    + if (ret < 0) {
    + dev_err(dev, "failed to request power node: %u\n",
    + pnode_id);
    + return ret;
    + }
    + ret = r5_set_mode(pdata);
    + if (ret < 0) {
    + dev_err(dev, "failed to set R5 operation mode.\n");
    + return ret;
    + }
    + }
    + size = resource_size(&rsc);
    +
    + va = devm_ioremap_wc(dev, rsc.start, size);
    + if (!va)
    + return -ENOMEM;
    +
    + /* zero out tcm base address */
    + if (rsc.start & 0xffe00000) {
    + rsc.start &= 0x000fffff;
    + /* handle tcm banks 1 a and b
    + * (0xffe9000 and oxffeb0000)
    + */
    + if (rsc.start & 0x80000)
    + rsc.start -= 0x90000;
    + }
    +
    + dma = (dma_addr_t)rsc.start;
    + mem = rproc_mem_entry_init(dev, va, dma, (int)size, rsc.start,
    + NULL, zynqmp_r5_mem_release,
    + rsc.name);
    + if (!mem)
    + return -ENOMEM;
    +
    + rproc_add_carveout(rproc, mem);
    + }
    +
    + ret = rproc_elf_load_rsc_table(rproc, fw);
    + if (ret == -EINVAL)
    + ret = 0;
    + return ret;
    +}
    +
    +/* kick a firmware */
    +static void zynqmp_r5_rproc_kick(struct rproc *rproc, int vqid)
    +{
    + struct device *dev = rproc->dev.parent;
    + struct zynqmp_r5_pdata *local = rproc->priv;
    +
    + dev_dbg(dev, "KICK Firmware to start send messages vqid %d\n", vqid);
    +
    + if (vqid < 0) {
    + /* If vqid is negative, does not pass the vqid to
    + * mailbox. As vqid is supposed to be 0 or possive.
    + * It also gives a way to just kick instead but
    + * not use the IPI buffer. It is better to provide
    + * a proper way to pass the short message, which will
    + * need to sync to upstream first, for now,
    + * use negative vqid to assume no message will be
    + * passed with IPI buffer, but just raise interrupt.
    + * This will be faster as it doesn't need to copy the
    + * message to the IPI buffer.
    + *
    + * It will ignore the return, as failure is due to
    + * there already kicks in the mailbox queue.
    + */
    + (void)mbox_send_message(local->tx_chan, NULL);
    + } else {
    + struct sk_buff *skb;
    + unsigned int skb_len;
    + struct zynqmp_ipi_message *mb_msg;
    + int ret;
    +
    + skb_len = (unsigned int)(sizeof(vqid) + sizeof(mb_msg));
    + skb = alloc_skb(skb_len, GFP_ATOMIC);
    + if (!skb) {
    + dev_err(dev,
    + "Failed to allocate skb to kick remote.\n");
    + return;
    + }
    + mb_msg = (struct zynqmp_ipi_message *)skb_put(skb, skb_len);
    + mb_msg->len = sizeof(vqid);
    + memcpy(mb_msg->data, &vqid, sizeof(vqid));
    + skb_queue_tail(&local->tx_mc_skbs, skb);
    + ret = mbox_send_message(local->tx_chan, mb_msg);
    + if (ret < 0) {
    + dev_warn(dev, "Failed to kick remote.\n");
    + skb_dequeue_tail(&local->tx_mc_skbs);
    + kfree_skb(skb);
    + }
    + }
    +}
    +
    +static struct rproc_ops zynqmp_r5_rproc_ops = {
    + .start = zynqmp_r5_rproc_start,
    + .stop = zynqmp_r5_rproc_stop,
    + .load = rproc_elf_load_segments,
    + .parse_fw = zynqmp_r5_parse_fw,
    + .find_loaded_rsc_table = rproc_elf_find_loaded_rsc_table,
    + .sanity_check = rproc_elf_sanity_check,
    + .get_boot_addr = rproc_elf_get_boot_addr,
    + .kick = zynqmp_r5_rproc_kick,
    +};
    +
    +/* zynqmp_r5_mem_probe() - probes RPU TCM memory device
    + * @pdata: pointer to the RPU remoteproc private data
    + * @node: pointer to the memory node
    + *
    + * Function to retrieve memories resources for RPU TCM memory device.
    + */
    +static int zynqmp_r5_mem_probe(struct zynqmp_r5_pdata *pdata,
    + struct device_node *node)
    +{
    + struct device *dev;
    + struct zynqmp_r5_mem *mem;
    + int ret;
    +
    + dev = &pdata->dev;
    + mem = devm_kzalloc(dev, sizeof(*mem), GFP_KERNEL);
    + if (!mem)
    + return -ENOMEM;
    + ret = of_address_to_resource(node, 0, &mem->res);
    + if (ret < 0) {
    + dev_err(dev, "failed to get resource of memory %s",
    + of_node_full_name(node));
    + return -EINVAL;
    + }
    +
    + /* Get the power domain id */
    + if (of_find_property(node, "pnode-id", NULL)) {
    + struct property *prop;
    + const __be32 *cur;
    + u32 val;
    + int i = 0;
    +
    + of_property_for_each_u32(node, "pnode-id", prop, cur, val)
    + mem->pnode_id[i++] = val;
    + }
    + list_add_tail(&mem->node, &pdata->mems);
    + return 0;
    +}
    +
    +/**
    + * zynqmp_r5_release() - ZynqMP R5 device release function
    + * @dev: pointer to the device struct of ZynqMP R5
    + *
    + * Function to release ZynqMP R5 device.
    + */
    +static void zynqmp_r5_release(struct device *dev)
    +{
    + struct zynqmp_r5_pdata *pdata;
    + struct rproc *rproc;
    + struct sk_buff *skb;
    +
    + pdata = dev_get_drvdata(dev);
    + rproc = pdata->rproc;
    + if (rproc) {
    + rproc_del(rproc);
    + rproc_free(rproc);
    + }
    + if (pdata->tx_chan)
    + mbox_free_channel(pdata->tx_chan);
    + if (pdata->rx_chan)
    + mbox_free_channel(pdata->rx_chan);
    + /* Discard all SKBs */
    + while (!skb_queue_empty(&pdata->tx_mc_skbs)) {
    + skb = skb_dequeue(&pdata->tx_mc_skbs);
    + kfree_skb(skb);
    + }
    +
    + put_device(dev->parent);
    +}
    +
    +/**
    + * event_notified_idr_cb() - event notified idr callback
    + * @id: idr id
    + * @ptr: pointer to idr private data
    + * @data: data passed to idr_for_each callback
    + *
    + * Pass notification to remtoeproc virtio
    + *
    + * Return: 0. having return is to satisfy the idr_for_each() function
    + * pointer input argument requirement.
    + **/
    +static int event_notified_idr_cb(int id, void *ptr, void *data)
    +{
    + struct rproc *rproc = data;
    +
    + (void)rproc_vq_interrupt(rproc, id);
    + return 0;
    +}
    +
    +/**
    + * handle_event_notified() - remoteproc notification work funciton
    + * @work: pointer to the work structure
    + *
    + * It checks each registered remoteproc notify IDs.
    + */
    +static void handle_event_notified(struct work_struct *work)
    +{
    + struct rproc *rproc;
    + struct zynqmp_r5_pdata *local;
    +
    + local = container_of(work, struct zynqmp_r5_pdata, workqueue);
    +
    + (void)mbox_send_message(local->rx_chan, NULL);
    + rproc = local->rproc;
    + /*
    + * We only use IPI for interrupt. The firmware side may or may
    + * not write the notifyid when it trigger IPI.
    + * And thus, we scan through all the registered notifyids.
    + */
    + idr_for_each(&rproc->notifyids, event_notified_idr_cb, rproc);
    +}
    +
    +/**
    + * zynqmp_r5_mb_rx_cb() - Receive channel mailbox callback
    + * @cl: mailbox client
    + * @mssg: message pointer
    + *
    + * It will schedule the R5 notification work.
    + */
    +static void zynqmp_r5_mb_rx_cb(struct mbox_client *cl, void *mssg)
    +{
    + struct zynqmp_r5_pdata *local;
    +
    + local = container_of(cl, struct zynqmp_r5_pdata, rx_mc);
    + if (mssg) {
    + struct zynqmp_ipi_message *ipi_msg, *buf_msg;
    + size_t len;
    +
    + ipi_msg = (struct zynqmp_ipi_message *)mssg;
    + buf_msg = (struct zynqmp_ipi_message *)local->rx_mc_buf;
    + len = (ipi_msg->len >= IPI_BUF_LEN_MAX) ?
    + IPI_BUF_LEN_MAX : ipi_msg->len;
    + buf_msg->len = len;
    + memcpy(buf_msg->data, ipi_msg->data, len);
    + }
    + schedule_work(&local->workqueue);
    +}
    +
    +/**
    + * zynqmp_r5_mb_tx_done() - Request has been sent to the remote
    + * @cl: mailbox client
    + * @mssg: pointer to the message which has been sent
    + * @r: status of last TX - OK or error
    + *
    + * It will be called by the mailbox framework when the last TX has done.
    + */
    +static void zynqmp_r5_mb_tx_done(struct mbox_client *cl, void *mssg, int r)
    +{
    + struct zynqmp_r5_pdata *local;
    + struct sk_buff *skb;
    +
    + if (!mssg)
    + return;
    + local = container_of(cl, struct zynqmp_r5_pdata, tx_mc);
    + skb = skb_dequeue(&local->tx_mc_skbs);
    + kfree_skb(skb);
    +}
    +
    +/**
    + * zynqmp_r5_setup_mbox() - Setup mailboxes
    + *
    + * @pdata: pointer to the ZynqMP R5 processor platform data
    + * @node: pointer of the device node
    + *
    + * Function to setup mailboxes to talk to RPU.
    + *
    + * Return: 0 for success, negative value for failure.
    + */
    +static int zynqmp_r5_setup_mbox(struct zynqmp_r5_pdata *pdata,
    + struct device_node *node)
    +{
    + struct device *dev = &pdata->dev;
    + struct mbox_client *mclient;
    +
    + /* Setup TX mailbox channel client */
    + mclient = &pdata->tx_mc;
    + mclient->dev = dev;
    + mclient->rx_callback = NULL;
    + mclient->tx_block = false;
    + mclient->knows_txdone = false;
    + mclient->tx_done = zynqmp_r5_mb_tx_done;
    +
    + /* Setup TX mailbox channel client */
    + mclient = &pdata->rx_mc;
    + mclient->dev = dev;
    + mclient->rx_callback = zynqmp_r5_mb_rx_cb;
    + mclient->tx_block = false;
    + mclient->knows_txdone = false;
    +
    + INIT_WORK(&pdata->workqueue, handle_event_notified);
    +
    + /* Request TX and RX channels */
    + pdata->tx_chan = mbox_request_channel_byname(&pdata->tx_mc, "tx");
    + if (IS_ERR(pdata->tx_chan)) {
    + dev_err(dev, "failed to request mbox tx channel.\n");
    + pdata->tx_chan = NULL;
    + return -EINVAL;
    + }
    + pdata->rx_chan = mbox_request_channel_byname(&pdata->rx_mc, "rx");
    + if (IS_ERR(pdata->rx_chan)) {
    + dev_err(dev, "failed to request mbox rx channel.\n");
    + pdata->rx_chan = NULL;
    + return -EINVAL;
    + }
    + skb_queue_head_init(&pdata->tx_mc_skbs);
    + return 0;
    +}
    +
    +/**
    + * zynqmp_r5_probe() - Probes ZynqMP R5 processor device node
    + * @pdata: pointer to the ZynqMP R5 processor platform data
    + * @pdev: parent RPU domain platform device
    + * @node: pointer of the device node
    + *
    + * Function to retrieve the information of the ZynqMP R5 device node.
    + *
    + * Return: 0 for success, negative value for failure.
    + */
    +static int zynqmp_r5_probe(struct zynqmp_r5_pdata *pdata,
    + struct platform_device *pdev,
    + struct device_node *node)
    +{
    + struct device *dev = &pdata->dev;
    + struct rproc *rproc;
    + struct device_node *nc;
    + int ret;
    +
    + /* Create device for ZynqMP R5 device */
    + dev->parent = &pdev->dev;
    + dev->release = zynqmp_r5_release;
    + dev->of_node = node;
    + dev_set_name(dev, "%s", of_node_full_name(node));
    + dev_set_drvdata(dev, pdata);
    + ret = device_register(dev);
    + if (ret) {
    + dev_err(dev, "failed to register device.\n");
    + return ret;
    + }
    + get_device(&pdev->dev);
    +
    + /* Allocate remoteproc instance */
    + rproc = rproc_alloc(dev, dev_name(dev), &zynqmp_r5_rproc_ops, NULL, 0);
    + if (!rproc) {
    + dev_err(dev, "rproc allocation failed.\n");
    + ret = -ENOMEM;
    + goto error;
    + }
    + rproc->auto_boot = autoboot;
    + pdata->rproc = rproc;
    + rproc->priv = pdata;
    +
    + /*
    + * The device has not been spawned from a device tree, so
    + * arch_setup_dma_ops has not been not called, thus leaving
    + * the device with dummy DMA ops.
    + * Fix this by inheriting the parent's DMA ops and mask.
    + */
    + rproc->dev.dma_mask = pdev->dev.dma_mask;
    + set_dma_ops(&rproc->dev, get_dma_ops(&pdev->dev));
    +
    + /* Probe R5 memory devices */
    + INIT_LIST_HEAD(&pdata->mems);
    + for_each_available_child_of_node(node, nc) {
    + ret = zynqmp_r5_mem_probe(pdata, nc);
    + if (ret) {
    + dev_err(dev, "failed to probe memory %s.\n",
    + of_node_full_name(nc));
    + goto error;
    + }
    + }
    +
    + /* Set up DMA mask */
    + ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
    + if (ret) {
    + dev_warn(dev, "dma_set_coherent_mask failed: %d\n", ret);
    + /* If DMA is not configured yet, try to configure it. */
    + ret = of_dma_configure(dev, node, true);
    + if (ret) {
    + dev_err(dev, "failed to configure DMA.\n");
    + goto error;
    + }
    + }
    +
    + /* Get R5 power domain node */
    + ret = of_property_read_u32(node, "pnode-id", &pdata->pnode_id);
    + if (ret) {
    + dev_err(dev, "failed to get power node id.\n");
    + goto error;
    + }
    +
    + /* Check if R5 is running */
    + if (r5_is_running(pdata)) {
    + atomic_inc(&rproc->power);
    + rproc->state = RPROC_RUNNING;
    + }
    +
    + if (!of_get_property(dev->of_node, "mboxes", NULL)) {
    + dev_info(dev, "no mailboxes.\n");
    + } else {
    + ret = zynqmp_r5_setup_mbox(pdata, node);
    + if (ret < 0)
    + goto error;
    + }
    +
    + /* Add R5 remoteproc */
    + ret = rproc_add(rproc);
    + if (ret) {
    + dev_err(dev, "rproc registration failed\n");
    + goto error;
    + }
    + return 0;
    +error:
    + if (pdata->rproc)
    + rproc_free(pdata->rproc);
    + pdata->rproc = NULL;
    + device_unregister(dev);
    + put_device(&pdev->dev);
    + return ret;
    +}
    +
    +static int zynqmp_r5_remoteproc_probe(struct platform_device *pdev)
    +{
    + const unsigned char *prop;
    + int ret = 0, i;
    + struct device *dev = &pdev->dev;
    + struct device_node *nc;
    +
    + prop = of_get_property(dev->of_node, "core_conf", NULL);
    + if (!prop) {
    + dev_err(&pdev->dev, "core_conf is not used.\n");
    + return -EINVAL;
    + }
    +
    + dev_info(dev, "RPU core_conf: %s\n", prop);
    + if (!strcmp(prop, "split")) {
    + rpu_mode = PM_RPU_MODE_SPLIT;
    + } else if (!strcmp(prop, "lockstep")) {
    + rpu_mode = PM_RPU_MODE_LOCKSTEP;
    + } else {
    + dev_err(dev,
    + "Invalid core_conf mode provided - %s , %d\n",
    + prop, (int)rpu_mode);
    + return -EINVAL;
    + }
    +
    + i = 0;
    + for_each_available_child_of_node(dev->of_node, nc) {
    + ret = zynqmp_r5_probe(&rpus[i], pdev, nc);
    + if (ret) {
    + dev_err(dev, "failed to probe rpu %s.\n",
    + of_node_full_name(nc));
    + return ret;
    + }
    + i++;
    + }
    +
    + return 0;
    +}
    +
    +static int zynqmp_r5_remoteproc_remove(struct platform_device *pdev)
    +{
    + int i;
    +
    + for (i = 0; i < MAX_RPROCS; i++) {
    + struct zynqmp_r5_pdata *rpu = &rpus[i];
    + struct rproc *rproc;
    +
    + rproc = rpu->rproc;
    + if (rproc) {
    + rproc_del(rproc);
    + rproc_free(rproc);
    + rpu->rproc = NULL;
    + }
    + if (rpu->tx_chan) {
    + mbox_free_channel(rpu->tx_chan);
    + rpu->tx_chan = NULL;
    + }
    + if (rpu->rx_chan) {
    + mbox_free_channel(rpu->rx_chan);
    + rpu->rx_chan = NULL;
    + }
    +
    + device_unregister(&rpu->dev);
    + }
    +
    + return 0;
    +}
    +
    +/* Match table for OF platform binding */
    +static const struct of_device_id zynqmp_r5_remoteproc_match[] = {
    + { .compatible = "xlnx,zynqmp-r5-remoteproc-1.0", },
    + { /* end of list */ },
    +};
    +MODULE_DEVICE_TABLE(of, zynqmp_r5_remoteproc_match);
    +
    +static struct platform_driver zynqmp_r5_remoteproc_driver = {
    + .probe = zynqmp_r5_remoteproc_probe,
    + .remove = zynqmp_r5_remoteproc_remove,
    + .driver = {
    + .name = "zynqmp_r5_remoteproc",
    + .of_match_table = zynqmp_r5_remoteproc_match,
    + },
    +};
    +module_platform_driver(zynqmp_r5_remoteproc_driver);
    +
    +module_param_named(autoboot, autoboot, bool, 0444);
    +MODULE_PARM_DESC(autoboot,
    + "enable | disable autoboot. (default: true)");
    +
    +MODULE_AUTHOR("Ben Levinsky <ben.levinsky@xilinx.com>");
    +MODULE_LICENSE("GPL v2");
    +MODULE_DESCRIPTION("ZynqMP R5 remote processor control driver");
    --
    2.7.4
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     \ /
      Last update: 2020-04-24 19:37    [W:3.717 / U:0.080 seconds]
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