Re: [PATCH 6/7] remoteproc: Add Xilinx ZynqMP R5 remoteproc

[Wendy Liang <sunnyliangjy@gmail.com>]

Ping, any comments to the driver?
On Thu, Aug 16, 2018 at 3:17 AM Wendy Liang <wendy.liang@xilinx.com> wrote:
>
> There are cortex-r5 processors in Xilinx Zynq UltraScale+
> MPSoC platforms. This remoteproc driver is to manage the
> R5 processors.
>
> Signed-off-by: Wendy Liang <jliang@xilinx.com>
> ---
>  drivers/remoteproc/Kconfig                |   9 +
>  drivers/remoteproc/Makefile               |   1 +
>  drivers/remoteproc/zynqmp_r5_remoteproc.c | 692 ++++++++++++++++++++++++++++++
>  3 files changed, 702 insertions(+)
>  create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c
>
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index cd1c168..83aac63 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -158,6 +158,15 @@ config ST_REMOTEPROC
>  config ST_SLIM_REMOTEPROC
>         tristate
>
> +config ZYNQMP_R5_REMOTEPROC
> +       tristate "ZynqMP_r5 remoteproc support"
> +       depends on ARM64 && PM && ARCH_ZYNQMP
> +       select RPMSG_VIRTIO
> +       select ZYNQMP_FIRMWARE
> +       help
> +         Say y here to support ZynqMP R5 remote processors via the remote
> +         processor framework.
> +
>  endif # REMOTEPROC
>
>  endmenu
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 02627ed..147923c 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -23,3 +23,4 @@ qcom_wcnss_pil-y                      += qcom_wcnss.o
>  qcom_wcnss_pil-y                       += qcom_wcnss_iris.o
>  obj-$(CONFIG_ST_REMOTEPROC)            += st_remoteproc.o
>  obj-$(CONFIG_ST_SLIM_REMOTEPROC)       += st_slim_rproc.o
> +obj-$(CONFIG_ZYNQMP_R5_REMOTEPROC)     += zynqmp_r5_remoteproc.o
> diff --git a/drivers/remoteproc/zynqmp_r5_remoteproc.c b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> new file mode 100644
> index 0000000..7fc3718
> --- /dev/null
> +++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c
> @@ -0,0 +1,692 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Zynq R5 Remote Processor driver
> + *
> + * Copyright (C) 2015 Xilinx, Inc.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/err.h>
> +#include <linux/platform_device.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/remoteproc.h>
> +#include <linux/interrupt.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_reserved_mem.h>
> +#include <linux/slab.h>
> +#include <linux/cpu.h>
> +#include <linux/delay.h>
> +#include <linux/list.h>
> +#include <linux/genalloc.h>
> +#include <linux/pfn.h>
> +#include <linux/idr.h>
> +#include <linux/firmware/xlnx-zynqmp.h>
> +
> +#include "remoteproc_internal.h"
> +
> +/* IPI reg offsets */
> +#define TRIG_OFFSET            0x00000000
> +#define OBS_OFFSET             0x00000004
> +#define ISR_OFFSET             0x00000010
> +#define IMR_OFFSET             0x00000014
> +#define IER_OFFSET             0x00000018
> +#define IDR_OFFSET             0x0000001C
> +#define IPI_ALL_MASK           0x0F0F0301
> +
> +/* RPU IPI mask */
> +#define RPU_IPI_INIT_MASK      0x00000100
> +#define RPU_IPI_MASK(n)                (RPU_IPI_INIT_MASK << (n))
> +#define RPU_0_IPI_MASK         RPU_IPI_MASK(0)
> +#define RPU_1_IPI_MASK         RPU_IPI_MASK(1)
> +
> +/* PM proc states */
> +#define PM_PROC_STATE_ACTIVE 1u
> +
> +/* Maximum TCM power nodes IDs */
> +#define MAX_TCM_PNODES 4
> +
> +/* Register access macros */
> +#define reg_read(base, reg) \
> +       readl(((void __iomem *)(base)) + (reg))
> +#define reg_write(base, reg, val) \
> +       writel((val), ((void __iomem *)(base)) + (reg))
> +
> +#define DEFAULT_FIRMWARE_NAME  "rproc-rpu-fw"
> +
> +static bool autoboot __read_mostly;
> +
> +struct zynqmp_r5_rproc_pdata;
> +
> +/**
> + * struct zynqmp_r5_rproc_pdata - zynqmp rpu remote processor instance state
> + * @rproc: rproc handle
> + * @workqueue: workqueue for the RPU remoteproc
> + * @ipi_base: virt ptr to IPI channel address registers for APU
> + * @rpu_mode: RPU core configuration
> + * @rpu_id: RPU CPU id
> + * @rpu_pnode_id: RPU CPU power domain id
> + * @mem_pools: list of gen_pool for firmware mmio_sram memory and their
> + *             power domain IDs
> + * @mems: list of rproc_mem_entries for firmware
> + * @irq: IRQ number
> + * @ipi_dest_mask: IPI destination mask for the IPI channel
> + */
> +struct zynqmp_r5_rproc_pdata {
> +       struct rproc *rproc;
> +       struct work_struct workqueue;
> +       void __iomem *ipi_base;
> +       enum rpu_oper_mode rpu_mode;
> +       struct list_head mems;
> +       u32 ipi_dest_mask;
> +       u32 rpu_id;
> +       u32 rpu_pnode_id;
> +       int irq;
> +       u32 tcm_pnode_id[MAX_TCM_PNODES];
> +};
> +
> +/**
> + * r5_boot_addr_config - configure the boot address of R5
> + * @pdata: platform data
> + * @bootmem: boot from LOVEC or HIVEC
> + *
> + * This function will set the RPU boot address
> + */
> +static void r5_boot_addr_config(struct zynqmp_r5_rproc_pdata *pdata,
> +                               enum rpu_boot_mem bootmem)
> +{
> +       const struct zynqmp_eemi_ops *eemi = zynqmp_pm_get_eemi_ops();
> +
> +       pr_debug("%s: R5 ID: %d, boot_dev %d\n",
> +                __func__, pdata->rpu_id, bootmem);
> +
> +       if (!eemi || !eemi->ioctl) {
> +               pr_err("%s: no eemi ioctl operation.\n", __func__);
> +               return;
> +       }
> +       eemi->ioctl(pdata->rpu_pnode_id, IOCTL_RPU_BOOT_ADDR_CONFIG,
> +                   bootmem, 0, NULL);
> +}
> +
> +/**
> + * r5_mode_config - configure R5 operation mode
> + * @pdata: platform data
> + *
> + * configure R5 to split mode or lockstep mode
> + * based on the platform data.
> + */
> +static void r5_mode_config(struct zynqmp_r5_rproc_pdata *pdata)
> +{
> +       const struct zynqmp_eemi_ops *eemi = zynqmp_pm_get_eemi_ops();
> +
> +       pr_debug("%s: mode: %d\n", __func__, pdata->rpu_mode);
> +
> +       if (!eemi || !eemi->ioctl) {
> +               pr_err("%s: no eemi ioctl operation.\n", __func__);
> +               return;
> +       }
> +       eemi->ioctl(pdata->rpu_pnode_id, IOCTL_SET_RPU_OPER_MODE,
> +                   pdata->rpu_mode, 0, NULL);
> +}
> +
> +/**
> + * r5_release_tcm() - release TCM
> + * @pdata: platform data
> + *
> + * Release TCM
> + */
> +static void r5_release_tcm(struct zynqmp_r5_rproc_pdata *pdata)
> +{
> +       const struct zynqmp_eemi_ops *eemi = zynqmp_pm_get_eemi_ops();
> +       int i;
> +
> +       if (!eemi || !eemi->release_node) {
> +               pr_err("Failed to release TCM\n");
> +               return;
> +       }
> +
> +       for (i = 0; i < MAX_TCM_PNODES; i++) {
> +               if (pdata->tcm_pnode_id[i] != 0)
> +                       eemi->release_node(pdata->tcm_pnode_id[i]);
> +       }
> +}
> +
> +/**
> + * disable_ipi - disable IPI
> + * @pdata: platform data
> + *
> + * Disable IPI interrupt
> + */
> +static inline void disable_ipi(struct zynqmp_r5_rproc_pdata *pdata)
> +{
> +       /* Disable R5 IPI interrupt */
> +       if (pdata->ipi_base)
> +               reg_write(pdata->ipi_base, IDR_OFFSET, pdata->ipi_dest_mask);
> +}
> +
> +/**
> + * enable_ipi - enable IPI
> + * @pdata: platform data
> + *
> + * Enable IPI interrupt
> + */
> +static inline void enable_ipi(struct zynqmp_r5_rproc_pdata *pdata)
> +{
> +       /* Enable R5 IPI interrupt */
> +       if (pdata->ipi_base)
> +               reg_write(pdata->ipi_base, IER_OFFSET, pdata->ipi_dest_mask);
> +}
> +
> +/**
> + * 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 remoteproc 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;
> +}
> +
> +static void handle_event_notified(struct work_struct *work)
> +{
> +       struct rproc *rproc;
> +       struct zynqmp_r5_rproc_pdata *local;
> +
> +       local = container_of(work, struct zynqmp_r5_rproc_pdata, workqueue);
> +       rproc = local->rproc;
> +       idr_for_each(&rproc->notifyids, event_notified_idr_cb, rproc);
> +}
> +
> +static int zynqmp_r5_rproc_start(struct rproc *rproc)
> +{
> +       struct device *dev = rproc->dev.parent;
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +       enum rpu_boot_mem bootmem;
> +       const struct zynqmp_eemi_ops *eemi = zynqmp_pm_get_eemi_ops();
> +
> +       dev_dbg(dev, "%s\n", __func__);
> +
> +       if (!eemi || !eemi->force_powerdown ||
> +           !eemi->request_wakeup) {
> +               pr_err("Failed to start R5\n");
> +               return -ENXIO;
> +       }
> +
> +       /* Set up R5 */
> +       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");
> +
> +       r5_mode_config(local);
> +       eemi->force_powerdown(local->rpu_pnode_id,
> +                             ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> +       r5_boot_addr_config(local, bootmem);
> +       /* Add delay before release from halt and reset */
> +       usleep_range(400, 500);
> +       eemi->request_wakeup(local->rpu_pnode_id,
> +                            1, bootmem,
> +                            ZYNQMP_PM_REQUEST_ACK_NO);
> +
> +       /* Make sure IPI is enabled */
> +       enable_ipi(local);
> +
> +       return 0;
> +}
> +
> +/* kick a firmware */
> +static void zynqmp_r5_rproc_kick(struct rproc *rproc, int vqid)
> +{
> +       struct device *dev = rproc->dev.parent;
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +
> +       dev_dbg(dev, "KICK Firmware to start send messages vqid %d\n", vqid);
> +
> +       /*
> +        * send irq to R5 firmware
> +        * Currently vqid is not used because we only got one.
> +        */
> +       if (local->ipi_base)
> +               reg_write(local->ipi_base, TRIG_OFFSET, local->ipi_dest_mask);
> +}
> +
> +/* power off the remote processor */
> +static int zynqmp_r5_rproc_stop(struct rproc *rproc)
> +{
> +       struct device *dev = rproc->dev.parent;
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +       struct rproc_mem_entry *mem, *nmem;
> +       const struct zynqmp_eemi_ops *eemi = zynqmp_pm_get_eemi_ops();
> +
> +       dev_dbg(dev, "%s\n", __func__);
> +
> +       if (!eemi || !eemi->force_powerdown) {
> +               pr_err("Failed to stop R5\n");
> +               return -ENXIO;
> +       }
> +
> +       disable_ipi(local);
> +       eemi->force_powerdown(local->rpu_pnode_id,
> +                             ZYNQMP_PM_REQUEST_ACK_BLOCKING);
> +
> +       return 0;
> +}
> +
> +static void *zynqmp_r5_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
> +{
> +       struct rproc_mem_entry *mem;
> +       void *va = NULL;
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +
> +       list_for_each_entry(mem, &local->mems, node) {
> +               int offset = da - mem->da;
> +
> +               /* try next carveout if da is too small */
> +               if (offset < 0)
> +                       continue;
> +
> +               /* try next carveout if da is too large */
> +               if (offset + len > mem->len)
> +                       continue;
> +
> +               va = mem->va + offset;
> +
> +               break;
> +       }
> +       return va;
> +}
> +
> +static int zynqmp_r5_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> +       int ret;
> +
> +       ret = rproc_elf_load_rsc_table(rproc, fw);
> +       if (ret == -EINVAL)
> +               /* No resource table */
> +               return 0;
> +       else
> +               return ret;
> +}
> +
> +static struct rproc_ops zynqmp_r5_rproc_ops = {
> +       .start          = zynqmp_r5_rproc_start,
> +       .stop           = zynqmp_r5_rproc_stop,
> +       .kick           = zynqmp_r5_rproc_kick,
> +       .da_to_va       = zynqmp_r5_rproc_da_to_va,
> +};
> +
> +/* Release R5 from reset and make it halted.
> + * In case the firmware uses TCM, in order to load firmware to TCM,
> + * will need to release R5 from reset and stay in halted state.
> + */
> +static int zynqmp_r5_rproc_init(struct rproc *rproc)
> +{
> +       struct device *dev = rproc->dev.parent;
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +
> +       dev_dbg(dev, "%s\n", __func__);
> +       enable_ipi(local);
> +       return 0;
> +}
> +
> +static irqreturn_t r5_remoteproc_interrupt(int irq, void *dev_id)
> +{
> +       struct device *dev = dev_id;
> +       struct platform_device *pdev = to_platform_device(dev);
> +       struct rproc *rproc = platform_get_drvdata(pdev);
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +       u32 ipi_reg;
> +
> +       /* Check if there is a kick from R5 */
> +       ipi_reg = reg_read(local->ipi_base, ISR_OFFSET);
> +       if (!(ipi_reg & local->ipi_dest_mask))
> +               return IRQ_NONE;
> +
> +       dev_dbg(dev, "KICK Linux because of pending message(irq%d)\n", irq);
> +       reg_write(local->ipi_base, ISR_OFFSET, local->ipi_dest_mask);
> +       schedule_work(&local->workqueue);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +/* zynqmp_r5_get_tcm_memories() - get tcm memories
> + * @pdev: pointer to the platform device
> + * @pdata: pointer to the remoteproc private data
> + *
> + * Function to create remoteproc memory entries for TCM memories.
> + */
> +static int zynqmp_r5_get_tcms(struct platform_device *pdev,
> +                             struct zynqmp_r5_rproc_pdata *pdata)
> +{
> +       static const char * const mem_names[] = {"tcm_a", "tcm_b"};
> +       struct device *dev = &pdev->dev;
> +       struct device_node *np = dev->of_node;
> +       int num_mems = 0;
> +       int i, ret;
> +       struct property *prop;
> +       const __be32 *cur;
> +       u32 val;
> +       const struct zynqmp_eemi_ops *eemi = zynqmp_pm_get_eemi_ops();
> +
> +       /* Get TCM power node ids */
> +       i = 0;
> +       of_property_for_each_u32(np, "tcm-pnode-id", prop, cur, val)
> +               pdata->tcm_pnode_id[i++] = val;
> +
> +       /* Request TCMs */
> +       for (i = 0; i < MAX_TCM_PNODES; i++) {
> +               if (pdata->tcm_pnode_id[i] != 0) {
> +                       ret = eemi->request_node(pdata->tcm_pnode_id[i],
> +                                                ZYNQMP_PM_CAPABILITY_ACCESS, 0,
> +                                                ZYNQMP_PM_REQUEST_ACK_BLOCKING
> +                                               );
> +                       if (ret < 0) {
> +                               dev_err(dev, "failed to request TCM: %u\n",
> +                                       pdata->tcm_pnode_id[i]);
> +                               return ret;
> +                       }
> +                       dev_dbg(dev, "request tcm pnode: %u\n",
> +                               pdata->tcm_pnode_id[i]);
> +               } else {
> +                       break;
> +               }
> +       }
> +       /* Create remoteproc memories entries for TCM memories */
> +       num_mems = ARRAY_SIZE(mem_names);
> +       for (i = 0; i < num_mems; i++) {
> +               struct resource *res;
> +               struct rproc_mem_entry *mem;
> +               dma_addr_t dma;
> +               resource_size_t size;
> +
> +               res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> +                                                  mem_names[i]);
> +               mem  = devm_kzalloc(dev, sizeof(struct rproc_mem_entry),
> +                                   GFP_KERNEL);
> +               if (!mem)
> +                       return -ENOMEM;
> +               /* Map it as normal memory */
> +               size = resource_size(res);
> +               mem->va = devm_ioremap_wc(dev, res->start, size);
> +               mem->len = size;
> +               dma = (dma_addr_t)res->start;
> +               mem->dma = dma;
> +               /* TCM memory:
> +                *   TCM_0: da 0 <-> global addr 0xFFE00000
> +                *   TCM_1: da 0 <-> global addr 0xFFE90000
> +                */
> +               if ((dma & 0xFFF00000) == 0xFFE00000) {
> +                       if ((dma & 0xFFF80000) == 0xFFE80000)
> +                               mem->da -= 0x90000;
> +                       else
> +                               mem->da = (dma & 0x000FFFFF);
> +               }
> +               dev_dbg(dev, "%s: va = %p, da = 0x%x dma = 0x%llx\n",
> +                       __func__, mem->va, mem->da, mem->dma);
> +               list_add_tail(&mem->node, &pdata->mems);
> +       }
> +       return 0;
> +}
> +
> +/* zynqmp_r5_get_reserved_mems() - get reserved memories
> + * @pdev: pointer to the platform device
> + * @pdata: pointer to the remoteproc private data
> + *
> + * Function to create remoteproc memory entries from memory-region
> + * property.
> + */
> +static int zynqmp_r5_get_reserved_mems(struct platform_device *pdev,
> +                                      struct zynqmp_r5_rproc_pdata *pdata)
> +{
> +       struct device *dev = &pdev->dev;
> +       struct device_node *np = dev->of_node;
> +       int num_mems;
> +       int i;
> +
> +       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 resource res;
> +               resource_size_t size;
> +               struct rproc_mem_entry *mem;
> +               int ret;
> +
> +               node = of_parse_phandle(np, "memory-region", i);
> +               ret = of_device_is_compatible(node, "rproc-prog-memory");
> +               if (!ret) {
> +                       /* it is DMA memory. */
> +                       dev_info(dev, "%s, dma memory %d\n", __func__, i);
> +                       ret = of_reserved_mem_device_init_by_idx(dev,
> +                                                                np, i);
> +                       if (ret) {
> +                               dev_err(dev, "unable to reserve DMA mem.\n");
> +                               return ret;
> +                       }
> +                       continue;
> +               }
> +               ret = of_address_to_resource(node, 0, &res);
> +               if (ret) {
> +                       dev_err(dev, "unable to resolve memory region.\n");
> +                       return ret;
> +               }
> +               mem  = devm_kzalloc(dev, sizeof(struct rproc_mem_entry),
> +                                   GFP_KERNEL);
> +               if (!mem)
> +                       return -ENOMEM;
> +               /* Map it as normal memory */
> +               size = resource_size(&res);
> +               mem->va = devm_ioremap_wc(dev, res.start, size);
> +               mem->len = size;
> +               mem->dma = (dma_addr_t)res.start;
> +               mem->da = (u32)res.start;
> +               dev_dbg(dev, "%s: va = %p, da = 0x%x dma = 0x%llx\n",
> +                       __func__, mem->va, mem->da, mem->dma);
> +               list_add_tail(&mem->node, &pdata->mems);
> +       }
> +       return 0;
> +}
> +
> +static int zynqmp_r5_remoteproc_probe(struct platform_device *pdev)
> +{
> +       const unsigned char *prop;
> +       struct resource *res;
> +       int ret = 0;
> +       struct zynqmp_r5_rproc_pdata *local;
> +       struct rproc *rproc;
> +
> +       rproc = rproc_alloc(&pdev->dev, dev_name(&pdev->dev),
> +                           &zynqmp_r5_rproc_ops, NULL,
> +               sizeof(struct zynqmp_r5_rproc_pdata));
> +       if (!rproc) {
> +               dev_err(&pdev->dev, "rproc allocation failed\n");
> +               return -ENOMEM;
> +       }
> +       local = rproc->priv;
> +       local->rproc = rproc;
> +
> +       platform_set_drvdata(pdev, rproc);
> +
> +       /* Override parse_fw op to allow no resource table firmware */
> +       rproc->ops->parse_fw = zynqmp_r5_parse_fw;
> +
> +       ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
> +       if (ret) {
> +               dev_err(&pdev->dev, "dma_set_coherent_mask: %d\n", ret);
> +               goto rproc_fault;
> +       }
> +
> +       /* Get the RPU power domain id */
> +       ret = of_property_read_u32(pdev->dev.of_node, "rpu-pnode-id",
> +                                  &local->rpu_pnode_id);
> +       if (ret) {
> +               dev_err(&pdev->dev, "No RPU power node ID is specified.\n");
> +               ret = -EINVAL;
> +               goto rproc_fault;
> +       }
> +       dev_dbg(&pdev->dev, "RPU[%d] pnode_id = %d.\n",
> +               local->rpu_id, local->rpu_pnode_id);
> +
> +       prop = of_get_property(pdev->dev.of_node, "core_conf", NULL);
> +       if (!prop) {
> +               dev_warn(&pdev->dev, "default core_conf used: lock-step\n");
> +               prop = "lock-step";
> +       }
> +
> +       dev_info(&pdev->dev, "RPU core_conf: %s\n", prop);
> +       if (!strcmp(prop, "split0")) {
> +               local->rpu_mode = PM_RPU_MODE_SPLIT;
> +               local->rpu_id = 0;
> +               local->ipi_dest_mask = RPU_0_IPI_MASK;
> +       } else if (!strcmp(prop, "split1")) {
> +               local->rpu_mode = PM_RPU_MODE_SPLIT;
> +               local->rpu_id = 1;
> +               local->ipi_dest_mask = RPU_1_IPI_MASK;
> +       } else if (!strcmp(prop, "lock-step")) {
> +               local->rpu_mode = PM_RPU_MODE_LOCKSTEP;
> +               local->rpu_id = 0;
> +               local->ipi_dest_mask = RPU_0_IPI_MASK;
> +       } else {
> +               dev_err(&pdev->dev, "Invalid core_conf mode provided - %s , %d\n",
> +                       prop, local->rpu_mode);
> +               ret = -EINVAL;
> +               goto rproc_fault;
> +       }
> +
> +       res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ipi");
> +       if (res) {
> +               local->ipi_base = devm_ioremap(&pdev->dev, res->start,
> +                                              resource_size(res));
> +               if (IS_ERR(local->ipi_base)) {
> +                       pr_err("%s: Unable to map IPI\n", __func__);
> +                       ret = PTR_ERR(local->ipi_base);
> +                       goto rproc_fault;
> +               }
> +       } else {
> +               dev_info(&pdev->dev, "IPI resource is not specified.\n");
> +       }
> +       dev_dbg(&pdev->dev, "got ipi base address\n");
> +
> +       INIT_LIST_HEAD(&local->mems);
> +       /* Get TCM memories */
> +       ret = zynqmp_r5_get_tcms(pdev, local);
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "failed to get TCM memories.\n");
> +               goto rproc_fault;
> +       }
> +       dev_dbg(&pdev->dev, "got TCM memories\n");
> +       /* Get reserved memory regions for firmware */
> +       ret = zynqmp_r5_get_reserved_mems(pdev, local);
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "failed to get reserved memories.\n");
> +               goto rproc_fault;
> +       }
> +       dev_dbg(&pdev->dev, "got reserved memories.\n");
> +
> +       /* Disable IPI before requesting IPI IRQ */
> +       disable_ipi(local);
> +       INIT_WORK(&local->workqueue, handle_event_notified);
> +
> +       /* IPI IRQ */
> +       if (local->ipi_base) {
> +               ret = platform_get_irq(pdev, 0);
> +               if (ret < 0) {
> +                       dev_err(&pdev->dev, "unable to find IPI IRQ\n");
> +                       goto rproc_fault;
> +               }
> +               local->irq = ret;
> +               ret = devm_request_irq(&pdev->dev, local->irq,
> +                                      r5_remoteproc_interrupt, IRQF_SHARED,
> +                                      dev_name(&pdev->dev), &pdev->dev);
> +               if (ret) {
> +                       dev_err(&pdev->dev, "IRQ %d already allocated\n",
> +                               local->irq);
> +                       goto rproc_fault;
> +               }
> +               dev_dbg(&pdev->dev, "notification irq: %d\n", local->irq);
> +       }
> +
> +       ret = zynqmp_r5_rproc_init(local->rproc);
> +       if (ret) {
> +               dev_err(&pdev->dev, "failed to init ZynqMP R5 rproc\n");
> +               goto rproc_fault;
> +       }
> +
> +       rproc->auto_boot = autoboot;
> +
> +       ret = rproc_add(local->rproc);
> +       if (ret) {
> +               dev_err(&pdev->dev, "rproc registration failed\n");
> +               goto rproc_fault;
> +       }
> +
> +       return ret;
> +
> +rproc_fault:
> +       rproc_free(local->rproc);
> +
> +       return ret;
> +}
> +
> +static int zynqmp_r5_remoteproc_remove(struct platform_device *pdev)
> +{
> +       struct rproc *rproc = platform_get_drvdata(pdev);
> +       struct zynqmp_r5_rproc_pdata *local = rproc->priv;
> +       struct rproc_mem_entry *mem;
> +
> +       dev_info(&pdev->dev, "%s\n", __func__);
> +
> +       rproc_del(rproc);
> +
> +       list_for_each_entry(mem, &local->mems, node) {
> +               if (mem->priv)
> +                       gen_pool_free((struct gen_pool *)mem->priv,
> +                                     (unsigned long)mem->va, mem->len);
> +       }
> +
> +       r5_release_tcm(local);
> +       of_reserved_mem_device_release(&pdev->dev);
> +       rproc_free(rproc);
> +
> +       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
>