[RFC,20/21] NTB: Add support for EPF PCI-Express Non-Transparent Bridge

Add support for EPF PCI-Express Non-Transparent Bridge (NTB) device.
This driver is platform independent and could be used by any platform
which have multiple PCIe endpoint instances configured using the
pci-epf-ntb driver. The driver connnects to the standard NTB sub-system
interface. The EPF NTB device has configurable number of memory windows
(Max 4), configurable number of doorbell (Max 32), and configurable
number of scratch-pad registers.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/ntb/hw/Kconfig          |   1 +
 drivers/ntb/hw/Makefile         |   1 +
 drivers/ntb/hw/epf/Kconfig      |   5 +
 drivers/ntb/hw/epf/Makefile     |   1 +
 drivers/ntb/hw/epf/ntb_hw_epf.c | 648 ++++++++++++++++++++++++++++++++
 5 files changed, 656 insertions(+)
 create mode 100644 drivers/ntb/hw/epf/Kconfig
 create mode 100644 drivers/ntb/hw/epf/Makefile
 create mode 100644 drivers/ntb/hw/epf/ntb_hw_epf.c

On Thu, Sep 26, 2019 at 7:32 AM 'Kishon Vijay Abraham I' via linux-ntb
<linux-ntb@googlegroups.com> wrote:
>
> Add support for EPF PCI-Express Non-Transparent Bridge (NTB) device.
> This driver is platform independent and could be used by any platform
> which have multiple PCIe endpoint instances configured using the
> pci-epf-ntb driver. The driver connnects to the standard NTB sub-system
> interface. The EPF NTB device has configurable number of memory windows
> (Max 4), configurable number of doorbell (Max 32), and configurable
> number of scratch-pad registers.
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
>  drivers/ntb/hw/Kconfig          |   1 +
>  drivers/ntb/hw/Makefile         |   1 +
>  drivers/ntb/hw/epf/Kconfig      |   5 +
>  drivers/ntb/hw/epf/Makefile     |   1 +
>  drivers/ntb/hw/epf/ntb_hw_epf.c | 648 ++++++++++++++++++++++++++++++++
>  5 files changed, 656 insertions(+)
>  create mode 100644 drivers/ntb/hw/epf/Kconfig
>  create mode 100644 drivers/ntb/hw/epf/Makefile
>  create mode 100644 drivers/ntb/hw/epf/ntb_hw_epf.c
>
> diff --git a/drivers/ntb/hw/Kconfig b/drivers/ntb/hw/Kconfig
> index e51b581fd102..623d43a2bec0 100644
> --- a/drivers/ntb/hw/Kconfig
> +++ b/drivers/ntb/hw/Kconfig
> @@ -1,4 +1,5 @@
>  source "drivers/ntb/hw/amd/Kconfig"
>  source "drivers/ntb/hw/idt/Kconfig"
>  source "drivers/ntb/hw/intel/Kconfig"
> +source "drivers/ntb/hw/epf/Kconfig"
>  source "drivers/ntb/hw/mscc/Kconfig"
> diff --git a/drivers/ntb/hw/Makefile b/drivers/ntb/hw/Makefile
> index 923c442db750..48f672ca857a 100644
> --- a/drivers/ntb/hw/Makefile
> +++ b/drivers/ntb/hw/Makefile
> @@ -1,4 +1,5 @@
>  obj-$(CONFIG_NTB_AMD)  += amd/
>  obj-$(CONFIG_NTB_IDT)  += idt/
>  obj-$(CONFIG_NTB_INTEL)        += intel/
> +obj-$(CONFIG_NTB_EPF)  += epf/
>  obj-$(CONFIG_NTB_SWITCHTEC) += mscc/
> diff --git a/drivers/ntb/hw/epf/Kconfig b/drivers/ntb/hw/epf/Kconfig
> new file mode 100644
> index 000000000000..314485574bf8
> --- /dev/null
> +++ b/drivers/ntb/hw/epf/Kconfig
> @@ -0,0 +1,5 @@
> +config NTB_EPF
> +       tristate "Generic EPF Non-Transparent Bridge support"
> +       help
> +         This driver supports EPF NTB on configurable endpoint.
> +         If unsure, say N.
> diff --git a/drivers/ntb/hw/epf/Makefile b/drivers/ntb/hw/epf/Makefile
> new file mode 100644
> index 000000000000..2f560a422bc6
> --- /dev/null
> +++ b/drivers/ntb/hw/epf/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_NTB_EPF) += ntb_hw_epf.o
> diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c b/drivers/ntb/hw/epf/ntb_hw_epf.c
> new file mode 100644
> index 000000000000..fba3d88886f2
> --- /dev/null
> +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c
> @@ -0,0 +1,648 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/**
> + * Host side endpoint driver to implement Non-Transparent Bridge functionality
> + *
> + * Copyright (C) 2019 Texas Instruments
> + * Author: Kishon Vijay Abraham I <kishon@ti.com>
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/slab.h>
> +#include <linux/ntb.h>
> +
> +#define NTB_EPF_COMMAND                0x0
> +#define CMD_CONFIGURE_DOORBELL 1
> +#define CMD_CONFIGURE_MW       2
> +#define CMD_LINK_UP            3
> +
> +#define NTB_EPF_ARGUMENT       0x4
> +
> +#define NTB_EPF_STATUS         0x8
> +#define COMMAND_STATUS_OK      BIT(0)
> +#define LINK_STATUS_UP         BIT(1)
> +
> +#define NTB_EPF_TOPOLOGY       0xc
> +#define NTB_EPF_ADDR           0x10
> +#define NTB_EPF_SIZE           0x18
> +#define NTB_EPF_MW1_OFFSET     0x1c
> +#define NTB_EPF_MW_COUNT       0x20
> +#define NTB_EPF_SPAD_OFFSET    0x24
> +#define NTB_EPF_SPAD_COUNT     0x28
> +#define NTB_EPF_DB_ENTRY_SIZE  0x2c
> +#define NTB_EPF_DB_DATA(n)     (0x30 + (n) * 4)
> +
> +#define NTB_MIN_DB_COUNT       2
> +#define NTB_MAX_DB_COUNT       32
> +#define NTB_MW_OFFSET          2
> +
> +enum pci_barno {
> +       BAR_0,
> +       BAR_1,
> +       BAR_2,
> +       BAR_3,
> +       BAR_4,
> +       BAR_5,
> +};
> +
> +struct ntb_epf_dev {
> +       struct ntb_dev ntb;
> +
> +       enum pci_barno ctrl_reg_bar;
> +       enum pci_barno peer_spad_reg_bar;
> +       enum pci_barno db_reg_bar;
> +
> +       unsigned int mw_count;
> +       unsigned int spad_count;
> +       unsigned int db_count;
> +
> +       void __iomem *ctrl_reg;
> +       void __iomem *db_reg;
> +       void __iomem *peer_spad_reg;
> +
> +       unsigned int self_spad;
> +       unsigned int peer_spad;
> +
> +       int db_val;
> +       u64 db_valid_mask;
> +};
> +
> +#define ntb_ndev(__ntb) container_of(__ntb, struct ntb_epf_dev, ntb)
> +
> +struct ntb_epf_data {
> +       /* BAR that contains both control region and self spad region */
> +       enum pci_barno ctrl_reg_bar;
> +       /* BAR that contains peer spad region */
> +       enum pci_barno peer_spad_reg_bar;
> +       /* BAR that contains Doorbell region and Memory window '1' */
> +       enum pci_barno db_reg_bar;
> +};
> +
> +static inline u32 ntb_epf_ctrl_readl(struct ntb_epf_dev *ndev, u32 offset)
> +{
> +       return readl(ndev->ctrl_reg + offset);
> +}
> +
> +static inline void ntb_epf_ctrl_writel(struct ntb_epf_dev *ndev, u32 offset,
> +                                      u32 val)
> +{
> +       return writel(val, ndev->ctrl_reg + offset);
> +}

Please no wrappers that hide standard functions.

> +
> +static int ntb_epf_send_command(struct ntb_epf_dev *ndev, u32 command,
> +                               u32 argument)
> +{
> +       ktime_t timeout;
> +       bool timedout;
> +       u32 status;
> +
> +       ntb_epf_ctrl_writel(ndev, NTB_EPF_ARGUMENT, argument);
> +       ntb_epf_ctrl_writel(ndev, NTB_EPF_COMMAND, command);
> +
> +       /* wait 50ms */
> +       timeout = ktime_add_ms(ktime_get(), 50);

Why 50?  Seems arbitrary, and like a good thing to be a #define

> +       while (1) {
> +               timedout = ktime_after(ktime_get(), timeout);
> +               status = ntb_epf_ctrl_readl(ndev, NTB_EPF_STATUS);
> +
> +               if (status & COMMAND_STATUS_OK)
> +                       break;
> +
> +               if (WARN_ON(timedout))
> +                       return -ETIMEDOUT;
> +
> +               usleep_range(5, 10);
> +       }
> +
> +       ntb_epf_ctrl_writel(ndev, NTB_EPF_STATUS, status & ~COMMAND_STATUS_OK);
> +
> +       return 0;
> +}
> +
> +static int ntb_epf_mw_to_bar(struct ntb_epf_dev *ndev, int idx)
> +{
> +       if (idx < 0 || idx > ndev->mw_count)
> +               return -EINVAL;
> +
> +       return idx + 2;
> +}
> +
> +static int ntb_epf_mw_count(struct ntb_dev *ntb, int pidx)
> +{
> +       if (pidx != NTB_DEF_PEER_IDX)
> +               return -EINVAL;
> +
> +       return ntb_ndev(ntb)->mw_count;
> +}
> +
> +static int ntb_epf_mw_get_align(struct ntb_dev *ntb, int pidx, int idx,
> +                               resource_size_t *addr_align,
> +                               resource_size_t *size_align,
> +                               resource_size_t *size_max)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       int bar;
> +
> +       if (pidx != NTB_DEF_PEER_IDX)
> +               return -EINVAL;
> +
> +       bar = ntb_epf_mw_to_bar(ndev, idx);
> +       if (bar < 0)
> +               return bar;
> +
> +       if (addr_align)
> +               *addr_align = SZ_4K;
> +
> +       if (size_align)
> +               *size_align = 1;
> +
> +       if (size_max)
> +               *size_max = pci_resource_len(ndev->ntb.pdev, bar);
> +
> +       return 0;
> +}
> +
> +static u64 ntb_epf_link_is_up(struct ntb_dev *ntb,
> +                             enum ntb_speed *speed,
> +                             enum ntb_width *width)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 status;
> +
> +       status = ntb_epf_ctrl_readl(ndev, NTB_EPF_STATUS);
> +
> +       return !!(status & LINK_STATUS_UP);
> +}
> +
> +static u32 ntb_epf_spad_read(struct ntb_dev *ntb, int idx)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 offset;
> +
> +       if (idx < 0 || idx >= ndev->spad_count)
> +               return 0;
> +
> +       offset = ntb_epf_ctrl_readl(ndev, NTB_EPF_SPAD_OFFSET);
> +       offset += (idx << 2);
> +
> +       return ntb_epf_ctrl_readl(ndev, offset);
> +}
> +
> +static int ntb_epf_spad_write(struct ntb_dev *ntb,
> +                             int idx, u32 val)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 offset;
> +
> +       if (idx < 0 || idx >= ndev->spad_count)
> +               return -EINVAL;
> +
> +       offset = ntb_epf_ctrl_readl(ndev, NTB_EPF_SPAD_OFFSET);
> +       offset += (idx << 2);
> +       ntb_epf_ctrl_writel(ndev, offset, val);
> +
> +       return 0;
> +}
> +
> +static u32 ntb_epf_peer_spad_read(struct ntb_dev *ntb, int pidx, int idx)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 offset;
> +
> +       if (idx < 0 || idx >= ndev->spad_count)
> +               return -EINVAL;
> +
> +       offset = (idx << 2);
> +       return readl(ndev->peer_spad_reg + offset);
> +}
> +
> +static int ntb_epf_peer_spad_write(struct ntb_dev *ntb, int pidx,
> +                                  int idx, u32 val)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 offset;
> +
> +       if (idx < 0 || idx >= ndev->spad_count)
> +               return -EINVAL;
> +
> +       offset = (idx << 2);
> +       writel(val, ndev->peer_spad_reg + offset);
> +
> +       return 0;
> +}
> +
> +static int ntb_epf_link_enable(struct ntb_dev *ntb,
> +                              enum ntb_speed max_speed,
> +                              enum ntb_width max_width)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       struct device *dev = &ntb->pdev->dev;
> +       int ret;
> +
> +       ret = ntb_epf_send_command(ndev, CMD_LINK_UP, 0);
> +       if (ret) {
> +               dev_err(dev, "Fail to enable link\n");
> +               return ret;
> +       }
> +
> +       return 0;
> +}
> +
> +static int ntb_epf_link_disable(struct ntb_dev *ntb)
> +{
> +       return 0;
> +}
> +
> +static irqreturn_t ndev_vec_isr(int irq, void *dev)
> +{
> +       struct ntb_epf_dev *ndev = dev;
> +       int irq_no;
> +
> +       irq_no = irq - ndev->ntb.pdev->irq;
> +       ndev->db_val = irq_no + 1;
> +
> +       if (irq_no == 0)
> +               ntb_link_event(&ndev->ntb);
> +       else
> +               ntb_db_event(&ndev->ntb, irq_no);
> +
> +       return IRQ_HANDLED;
> +}
> +
> +static int ntb_epf_init_isr(struct ntb_epf_dev *ndev, int msi_min, int msi_max)
> +{
> +       struct pci_dev *pdev = ndev->ntb.pdev;
> +       struct device *dev = &pdev->dev;
> +       int irq;
> +       int ret;
> +       int i;
> +
> +       irq = pci_alloc_irq_vectors(pdev, msi_min, msi_max, PCI_IRQ_MSI);
> +       if (irq < 0) {
> +               dev_err(dev, "Failed to get MSI interrupts\n");
> +               return irq;
> +       }
> +
> +       for (i = 0; i < irq; i++) {
> +               ret = devm_request_irq(&pdev->dev, pci_irq_vector(pdev, i),
> +                                      ndev_vec_isr, IRQF_SHARED, "ntb_epf",
> +                                      ndev);
> +               if (ret) {
> +                       dev_err(dev, "Failed to request irq\n");
> +                       goto err_request_irq;
> +               }
> +       }
> +
> +       ndev->db_count = irq;
> +
> +       ret = ntb_epf_send_command(ndev, CMD_CONFIGURE_DOORBELL, irq);
> +       if (ret) {
> +               dev_err(dev, "Failed to configure doorbell\n");
> +               goto err_request_irq;
> +       }
> +
> +       return 0;
> +
> +err_request_irq:
> +       pci_free_irq_vectors(pdev);
> +
> +       return ret;
> +}
> +
> +static int ntb_epf_peer_mw_count(struct ntb_dev *ntb)
> +{
> +       return ntb_ndev(ntb)->mw_count;
> +}
> +
> +static int ntb_epf_spad_count(struct ntb_dev *ntb)
> +{
> +       return ntb_ndev(ntb)->spad_count;
> +}
> +
> +static u64 ntb_epf_db_valid_mask(struct ntb_dev *ntb)
> +{
> +       return ntb_ndev(ntb)->db_valid_mask;
> +}
> +
> +static int ntb_epf_db_set_mask(struct ntb_dev *ntb, u64 db_bits)
> +{
> +       return 0;
> +}
> +
> +static int ntb_epf_mw_set_trans(struct ntb_dev *ntb, int pidx, int idx,
> +                               dma_addr_t addr, resource_size_t size)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       struct device *dev = &ntb->pdev->dev;
> +       resource_size_t mw_size;
> +       int bar;
> +
> +       if (pidx != NTB_DEF_PEER_IDX)
> +               return -EINVAL;
> +
> +       bar = idx + NTB_MW_OFFSET;
> +
> +       mw_size = pci_resource_len(ntb->pdev, bar);
> +
> +       if (size > mw_size) {
> +               dev_err(dev, "Size is greater than the MW size\n");
> +               return -EINVAL;
> +       }
> +
> +       ntb_epf_ctrl_writel(ndev, NTB_EPF_ADDR, addr);
> +       ntb_epf_ctrl_writel(ndev, NTB_EPF_SIZE, size);
> +       ntb_epf_send_command(ndev, CMD_CONFIGURE_MW, idx);
> +
> +       return 0;
> +}
> +
> +static int ntb_epf_peer_mw_get_addr(struct ntb_dev *ntb, int idx,
> +                                   phys_addr_t *base, resource_size_t *size)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 offset = 0;
> +       int bar;
> +
> +       if (idx == 0)
> +               offset = ntb_epf_ctrl_readl(ndev, NTB_EPF_MW1_OFFSET);
> +
> +       bar = idx + NTB_MW_OFFSET;
> +
> +       if (base)
> +               *base = pci_resource_start(ndev->ntb.pdev, bar) + offset;
> +
> +       if (size)
> +               *size = pci_resource_len(ndev->ntb.pdev, bar) - offset;
> +
> +       return 0;
> +}
> +
> +static int ntb_epf_peer_db_set(struct ntb_dev *ntb, u64 db_bits)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +       u32 interrupt_num = ffs(db_bits) + 1;
> +       u32 db_entry_size;
> +       u32 db_data;
> +
> +       if (interrupt_num > ndev->db_count)
> +               return -EINVAL;
> +
> +       db_entry_size = ntb_epf_ctrl_readl(ndev, NTB_EPF_DB_ENTRY_SIZE);
> +
> +       db_data = readl(ndev->ctrl_reg + NTB_EPF_DB_DATA(interrupt_num));
> +       writel(db_data, ndev->db_reg + (db_entry_size * interrupt_num));
> +
> +       return 0;
> +}
> +
> +static u64 ntb_epf_db_read(struct ntb_dev *ntb)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +
> +       return ndev->db_val;
> +}
> +
> +static int ntb_epf_db_clear_mask(struct ntb_dev *ntb, u64 db_bits)
> +{
> +       return 0;
> +}
> +
> +static int ntb_epf_db_clear(struct ntb_dev *ntb, u64 db_bits)
> +{
> +       struct ntb_epf_dev *ndev = ntb_ndev(ntb);
> +
> +       ndev->db_val = 0;
> +
> +       return 0;
> +}
> +
> +static const struct ntb_dev_ops ntb_epf_ops = {
> +       .mw_count               = ntb_epf_mw_count,
> +       .spad_count             = ntb_epf_spad_count,
> +       .peer_mw_count          = ntb_epf_peer_mw_count,
> +       .db_valid_mask          = ntb_epf_db_valid_mask,
> +       .db_set_mask            = ntb_epf_db_set_mask,
> +       .mw_set_trans           = ntb_epf_mw_set_trans,
> +       .peer_mw_get_addr       = ntb_epf_peer_mw_get_addr,
> +       .link_enable            = ntb_epf_link_enable,
> +       .spad_read              = ntb_epf_spad_read,
> +       .spad_write             = ntb_epf_spad_write,
> +       .peer_spad_read         = ntb_epf_peer_spad_read,
> +       .peer_spad_write        = ntb_epf_peer_spad_write,
> +       .peer_db_set            = ntb_epf_peer_db_set,
> +       .db_read                = ntb_epf_db_read,
> +       .mw_get_align           = ntb_epf_mw_get_align,
> +       .link_is_up             = ntb_epf_link_is_up,
> +       .db_clear_mask          = ntb_epf_db_clear_mask,
> +       .db_clear               = ntb_epf_db_clear,
> +       .link_disable           = ntb_epf_link_disable,
> +};
> +
> +static inline void ntb_epf_init_struct(struct ntb_epf_dev *ndev,
> +                                      struct pci_dev *pdev)
> +{
> +       ndev->ntb.pdev = pdev;
> +       ndev->ntb.topo = NTB_TOPO_NONE;
> +       ndev->ntb.ops = &ntb_epf_ops;
> +}
> +
> +static int ntb_epf_init_dev(struct ntb_epf_dev *ndev)
> +{
> +       struct pci_dev *pdev = ndev->ntb.pdev;
> +       struct device *dev = &pdev->dev;
> +       int ret;
> +
> +       ret = ntb_epf_init_isr(ndev, NTB_MIN_DB_COUNT, NTB_MAX_DB_COUNT);
> +       if (ret) {
> +               dev_err(dev, "Failed to init ISR\n");
> +               return ret;
> +       }
> +
> +       ndev->db_valid_mask = BIT_ULL(ndev->db_count) - 1;
> +       ndev->mw_count = ntb_epf_ctrl_readl(ndev, NTB_EPF_MW_COUNT);
> +       ndev->spad_count = ntb_epf_ctrl_readl(ndev, NTB_EPF_SPAD_COUNT);
> +
> +       return 0;
> +}
> +
> +static int ntb_epf_init_pci(struct ntb_epf_dev *ndev,
> +                           struct pci_dev *pdev)
> +{
> +       struct device *dev = &pdev->dev;
> +       int ret;
> +
> +       pci_set_drvdata(pdev, ndev);
> +
> +       ret = pci_enable_device(pdev);
> +       if (ret) {
> +               dev_err(dev, "Cannot enable PCI device\n");
> +               goto err_pci_enable;
> +       }
> +
> +       ret = pci_request_regions(pdev, "ntb");
> +       if (ret) {
> +               dev_err(dev, "Cannot obtain PCI resources\n");
> +               goto err_pci_regions;
> +       }
> +
> +       pci_set_master(pdev);
> +
> +       ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +       if (ret) {
> +               ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
> +               if (ret) {
> +                       dev_err(dev, "Cannot set DMA mask\n");
> +                       goto err_dma_mask;
> +               }
> +               dev_warn(&pdev->dev, "Cannot DMA highmem\n");
> +       }
> +
> +       ret = dma_coerce_mask_and_coherent(&ndev->ntb.dev,
> +                                          dma_get_mask(&pdev->dev));
> +       if (ret) {
> +               dev_err(dev, "Cannot set DMA mask\n");
> +               goto err_dma_mask;
> +       }
> +
> +       ndev->ctrl_reg = pci_iomap(pdev, 0, 0);
> +       if (!ndev->ctrl_reg) {
> +               ret = -EIO;
> +               goto err_dma_mask;
> +       }
> +
> +       ndev->peer_spad_reg = pci_iomap(pdev, 1, 0);
> +       if (!ndev->peer_spad_reg) {
> +               ret = -EIO;
> +               goto err_dma_mask;
> +       }
> +
> +       ndev->db_reg = pci_iomap(pdev, 2, 0);
> +       if (!ndev->db_reg) {
> +               ret = -EIO;
> +               goto err_dma_mask;
> +       }
> +
> +       return 0;
> +
> +err_dma_mask:
> +       pci_clear_master(pdev);
> +
> +err_pci_regions:
> +       pci_disable_device(pdev);
> +
> +err_pci_enable:
> +       pci_set_drvdata(pdev, NULL);
> +
> +       return ret;
> +}
> +
> +static void ntb_epf_deinit_pci(struct ntb_epf_dev *ndev)
> +{
> +       struct pci_dev *pdev = ndev->ntb.pdev;
> +
> +       pci_iounmap(pdev, ndev->ctrl_reg);
> +       pci_iounmap(pdev, ndev->peer_spad_reg);
> +       pci_iounmap(pdev, ndev->db_reg);
> +
> +       pci_clear_master(pdev);
> +       pci_release_regions(pdev);
> +       pci_disable_device(pdev);
> +       pci_set_drvdata(pdev, NULL);
> +}
> +
> +static int ntb_epf_pci_probe(struct pci_dev *pdev,
> +                            const struct pci_device_id *id)
> +{
> +       enum pci_barno peer_spad_reg_bar = BAR_1;
> +       enum pci_barno ctrl_reg_bar = BAR_0;
> +       enum pci_barno db_reg_bar = BAR_2;
> +       struct device *dev = &pdev->dev;
> +       struct ntb_epf_data *data;
> +       struct ntb_epf_dev *ndev;
> +       int ret;
> +
> +       ndev = devm_kzalloc(dev, sizeof(*ndev), GFP_KERNEL);
> +       if (!ndev)
> +               return -ENOMEM;
> +
> +       data = (struct ntb_epf_data *)id->driver_data;
> +       if (data) {
> +               if (data->peer_spad_reg_bar)
> +                       peer_spad_reg_bar = data->peer_spad_reg_bar;
> +               if (data->ctrl_reg_bar)
> +                       ctrl_reg_bar = data->ctrl_reg_bar;
> +               if (data->db_reg_bar)
> +                       db_reg_bar = data->db_reg_bar;
> +       }
> +
> +       ndev->peer_spad_reg_bar = peer_spad_reg_bar;
> +       ndev->ctrl_reg_bar = ctrl_reg_bar;
> +       ndev->db_reg_bar = db_reg_bar;
> +
> +       ntb_epf_init_struct(ndev, pdev);
> +
> +       ret = ntb_epf_init_pci(ndev, pdev);
> +       if (ret) {
> +               dev_err(dev, "Failed to init PCI\n");
> +               return ret;
> +       }
> +
> +       ret = ntb_epf_init_dev(ndev);
> +       if (ret) {
> +               dev_err(dev, "Failed to init device\n");
> +               goto err_init_dev;
> +       }
> +
> +       ret = ntb_register_device(&ndev->ntb);
> +       if (ret) {
> +               dev_err(dev, "Failed to register NTB device\n");
> +               goto err_register_dev;
> +       }
> +
> +       return 0;
> +
> +err_register_dev:
> +       pci_free_irq_vectors(pdev);
> +
> +err_init_dev:
> +       ntb_epf_deinit_pci(ndev);
> +
> +       return ret;
> +}
> +
> +static void ntb_epf_pci_remove(struct pci_dev *pdev)
> +{
> +       struct ntb_epf_dev *ndev = pci_get_drvdata(pdev);
> +
> +       ntb_unregister_device(&ndev->ntb);
> +       pci_free_irq_vectors(pdev);
> +       kfree(ndev);
> +}
> +
> +static const struct ntb_epf_data j721e_data = {
> +       .ctrl_reg_bar = BAR_0,
> +       .peer_spad_reg_bar = BAR_1,
> +       .db_reg_bar = BAR_2,
> +};
> +
> +static const struct pci_device_id ntb_epf_pci_tbl[] = {
> +       {
> +               PCI_DEVICE(PCI_VENDOR_ID_TI, PCI_DEVICE_ID_TI_J721E),
> +               .driver_data = (kernel_ulong_t)&j721e_data,
> +       },
> +       { },
> +};
> +MODULE_DEVICE_TABLE(pci, ntb_epf_pci_tbl);
> +
> +static struct pci_driver ntb_epf_pci_driver = {
> +       .name           = KBUILD_MODNAME,
> +       .id_table       = ntb_epf_pci_tbl,
> +       .probe          = ntb_epf_pci_probe,
> +       .remove         = ntb_epf_pci_remove,
> +};
> +module_pci_driver(ntb_epf_pci_driver);
> +
> +MODULE_DESCRIPTION("PCI ENDPOINT NTB HOST DRIVER");
> +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.1
>
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