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Subject[PATCH 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver
Date
From: Jason Wu <j.wu@xilinx.com>

R5 is included in Xilinx Zynq UltraScale MPSoC so by adding this
remotproc driver, we can boot the R5 sub-system in different
configurations.

Signed-off-by: Jason Wu <j.wu@xilinx.com>

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>
Tested-by: Ben Levinsky <ben.levinsky@xilinx.com>
---
drivers/remoteproc/Kconfig | 10 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/zynqmp_r5_remoteproc.c | 913 ++++++++++++++++++++++++++++++
3 files changed, 924 insertions(+)
create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index de3862c..be14eba 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -206,6 +206,16 @@ 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 e30a1b1..ee18d26 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -26,5 +26,6 @@ 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..a84ee8e
--- /dev/null
+++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c
@@ -0,0 +1,913 @@
+// 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 */
+
+/* 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))
+
+#define PM_HIVEC_MASK 0xF0000000
+
+#define TCM_BASE_ADDR 0xFFE00000
+#define TCM_LOW_BITMASK 0x000FFFFF
+#define TCM_BANK1_BITMASK 0x80000
+#define TCM_BANK1_HIGHBIT_BITMASK 0x90000
+
+static bool autoboot __read_mostly;
+
+static const struct zynqmp_eemi_ops *eemi_ops;
+
+/**
+ * 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
+ * @parent: RPU slot platform data
+ * @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;
+ struct zynqmp_rpu_domain_pdata *parent;
+ 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];
+};
+
+/**
+ * struct zynqmp_rpu_domain_pdata - zynqmp rpu platform data
+ * @rpus: table of RPUs
+ * @rpu_mode: RPU core configuration
+ */
+struct zynqmp_rpu_domain_pdata {
+ struct zynqmp_r5_pdata rpus[MAX_RPROCS];
+ enum rpu_oper_mode rpu_mode;
+};
+
+/*
+ * r5_set_mode - set RPU operation mode
+ * @pdata: Remote processor private data
+ *
+ * set RPU operation 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 zynqmp_rpu_domain_pdata *parent;
+ struct device *dev = &pdata->dev;
+ int ret;
+
+ if (pdata->is_r5_mode_set)
+ return 0;
+ parent = pdata->parent;
+ expect = (u32)parent->rpu_mode;
+ ret = eemi_ops->ioctl(pdata->pnode_id, IOCTL_GET_RPU_OPER_MODE,
+ 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 = eemi_ops->ioctl(pdata->pnode_id,
+ IOCTL_SET_RPU_OPER_MODE,
+ 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 = eemi_ops->ioctl(pdata->pnode_id, IOCTL_TCM_COMB_CONFIG,
+ 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 (eemi_ops->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 = eemi_ops->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 & PM_HIVEC_MASK) == PM_HIVEC_MASK)
+ 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 = eemi_ops->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 = eemi_ops->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)
+{
+ struct zynqmp_r5_pdata *pdata = rproc->priv;
+ struct zynqmp_r5_mem *zynqmp_mem;
+ struct device *dev = &pdata->dev;
+ struct device_node *np = dev->of_node;
+ int num_mems;
+ int ret, i, dma_pool_index = 0;
+ struct reserved_mem *rmem;
+ 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;
+ int ret;
+
+ 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] - 48;
+ 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",
+ name);
+ return -EINVAL;
+ }
+
+ 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 -EINVAL;
+ }
+
+ mem->va = devm_ioremap_wc(dev, rmem->base, rmem->size);
+ if (!mem->va) {
+ dev_err(dev, "unable to map va for %s\n",
+ node->name);
+ return -EINVAL;
+ }
+
+ 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) {
+ ret = of_address_to_resource(child, 0, &rsc);
+ struct property *prop;
+ const __be32 *cur;
+ u32 pnode_id;
+ void *va;
+ dma_addr_t dma;
+ resource_size_t size;
+
+ i = 0;
+ of_property_for_each_u32(child, "pnode-id", prop, cur,
+ pnode_id) {
+ ret = eemi_ops->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) {
+ dev_err(dev, "unable to map va for TCM\n");
+ return -EINVAL;
+ }
+
+ /* zero out tcm base address */
+ if (rsc.start & TCM_BASE_ADDR) {
+ rsc.start &= TCM_LOW_BITMASK; /*wipe low bits */
+ /* handle tcm banks 1 a and b (0xffe9000 and oxffeb0000) */
+ if (rsc.start & TCM_BANK1_BITMASK)
+ /* wipe high bits as RPU only sees relative addr from 0x0 to 0x20000 */
+ rsc.start -= TCM_BANK1_HIGHBIT_BITMASK;
+ }
+
+ 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 NULL;
+ 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 *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);
+ 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 zynqmp_rpu_domain_pdata *local;
+ struct device *dev = &pdev->dev;
+ struct device_node *nc;
+
+ eemi_ops = zynqmp_pm_get_eemi_ops();
+ if (IS_ERR(eemi_ops))
+ return PTR_ERR(eemi_ops);
+
+ local = devm_kzalloc(dev, sizeof(*local), GFP_KERNEL);
+ if (!local)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, local);
+
+ 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")) {
+ local->rpu_mode = PM_RPU_MODE_SPLIT;
+ } else if (!strcmp(prop, "lockstep")) {
+ local->rpu_mode = PM_RPU_MODE_LOCKSTEP;
+ } else {
+ dev_err(dev,
+ "Invalid core_conf mode provided - %s , %d\n",
+ prop, (int)local->rpu_mode);
+ return -EINVAL;
+ }
+
+ i = 0;
+ for_each_available_child_of_node(dev->of_node, nc) {
+ if (i > 1) {
+ dev_err(dev, "Max number allowed RPUs described is 2.\n");
+ return -EINVAL;
+ }
+ local->rpus[i].parent = local;
+ ret = zynqmp_r5_probe(&local->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)
+{
+ struct zynqmp_rpu_domain_pdata *local = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < MAX_RPROCS; i++) {
+ struct zynqmp_r5_pdata *rpu = &local->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("Jason Wu <j.wu@xilinx.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ZynqMP R5 remote processor control driver");
--
2.7.4
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