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    Subject[PATCH V3 XRT Alveo 10/18] fpga: xrt: VSEC platform driver
    Date
    Add VSEC driver. VSEC is a hardware function discovered by walking
    PCI Express configure space. A platform device node will be created
    for it. VSEC provides board logic UUID and few offset of other hardware
    functions.

    Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
    Signed-off-by: Max Zhen <max.zhen@xilinx.com>
    Signed-off-by: Lizhi Hou <lizhih@xilinx.com>
    ---
    drivers/fpga/xrt/lib/xleaf/vsec.c | 359 ++++++++++++++++++++++++++++++
    1 file changed, 359 insertions(+)
    create mode 100644 drivers/fpga/xrt/lib/xleaf/vsec.c

    diff --git a/drivers/fpga/xrt/lib/xleaf/vsec.c b/drivers/fpga/xrt/lib/xleaf/vsec.c
    new file mode 100644
    index 000000000000..8e5cb22522ec
    --- /dev/null
    +++ b/drivers/fpga/xrt/lib/xleaf/vsec.c
    @@ -0,0 +1,359 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Xilinx Alveo FPGA VSEC Driver
    + *
    + * Copyright (C) 2020-2021 Xilinx, Inc.
    + *
    + * Authors:
    + * Lizhi Hou<Lizhi.Hou@xilinx.com>
    + */
    +
    +#include <linux/platform_device.h>
    +#include "metadata.h"
    +#include "xleaf.h"
    +
    +#define XRT_VSEC "xrt_vsec"
    +
    +#define VSEC_TYPE_UUID 0x50
    +#define VSEC_TYPE_FLASH 0x51
    +#define VSEC_TYPE_PLATINFO 0x52
    +#define VSEC_TYPE_MAILBOX 0x53
    +#define VSEC_TYPE_END 0xff
    +
    +#define VSEC_UUID_LEN 16
    +
    +struct xrt_vsec_header {
    + u32 format;
    + u32 length;
    + u32 entry_sz;
    + u32 rsvd;
    +} __packed;
    +
    +#define head_rd(g, r) \
    + ioread32((void *)(g)->base + offsetof(struct xrt_vsec_header, r))
    +
    +#define GET_BAR(entry) (((entry)->bar_rev >> 4) & 0xf)
    +#define GET_BAR_OFF(_entry) \
    + ({ typeof(_entry) entry = (_entry); \
    + ((entry)->off_lo | ((u64)(entry)->off_hi << 16)); })
    +#define GET_REV(entry) ((entry)->bar_rev & 0xf)
    +
    +struct xrt_vsec_entry {
    + u8 type;
    + u8 bar_rev;
    + u16 off_lo;
    + u32 off_hi;
    + u8 ver_type;
    + u8 minor;
    + u8 major;
    + u8 rsvd0;
    + u32 rsvd1;
    +} __packed;
    +
    +#define read_entry(g, i, e) \
    + do { \
    + u32 *p = (u32 *)((g)->base + \
    + sizeof(struct xrt_vsec_header) + \
    + (i) * sizeof(struct xrt_vsec_entry)); \
    + u32 off; \
    + for (off = 0; \
    + off < sizeof(struct xrt_vsec_entry) / 4; \
    + off++) \
    + *((u32 *)(e) + off) = ioread32(p + off);\
    + } while (0)
    +
    +struct vsec_device {
    + u8 type;
    + char *ep_name;
    + ulong size;
    + char *regmap;
    +};
    +
    +static struct vsec_device vsec_devs[] = {
    + {
    + .type = VSEC_TYPE_UUID,
    + .ep_name = XRT_MD_NODE_BLP_ROM,
    + .size = VSEC_UUID_LEN,
    + .regmap = "vsec-uuid",
    + },
    + {
    + .type = VSEC_TYPE_FLASH,
    + .ep_name = XRT_MD_NODE_FLASH_VSEC,
    + .size = 4096,
    + .regmap = "vsec-flash",
    + },
    + {
    + .type = VSEC_TYPE_PLATINFO,
    + .ep_name = XRT_MD_NODE_PLAT_INFO,
    + .size = 4,
    + .regmap = "vsec-platinfo",
    + },
    + {
    + .type = VSEC_TYPE_MAILBOX,
    + .ep_name = XRT_MD_NODE_MAILBOX_VSEC,
    + .size = 48,
    + .regmap = "vsec-mbx",
    + },
    +};
    +
    +struct xrt_vsec {
    + struct platform_device *pdev;
    + void *base;
    + ulong length;
    +
    + char *metadata;
    + char uuid[VSEC_UUID_LEN];
    +};
    +
    +static char *type2epname(u32 type)
    +{
    + int i;
    +
    + for (i = 0; i < ARRAY_SIZE(vsec_devs); i++) {
    + if (vsec_devs[i].type == type)
    + return (vsec_devs[i].ep_name);
    + }
    +
    + return NULL;
    +}
    +
    +static ulong type2size(u32 type)
    +{
    + int i;
    +
    + for (i = 0; i < ARRAY_SIZE(vsec_devs); i++) {
    + if (vsec_devs[i].type == type)
    + return (vsec_devs[i].size);
    + }
    +
    + return 0;
    +}
    +
    +static char *type2regmap(u32 type)
    +{
    + int i;
    +
    + for (i = 0; i < ARRAY_SIZE(vsec_devs); i++) {
    + if (vsec_devs[i].type == type)
    + return (vsec_devs[i].regmap);
    + }
    +
    + return NULL;
    +}
    +
    +static int xrt_vsec_add_node(struct xrt_vsec *vsec,
    + void *md_blob, struct xrt_vsec_entry *p_entry)
    +{
    + struct xrt_md_endpoint ep;
    + char regmap_ver[64];
    + int ret;
    +
    + if (!type2epname(p_entry->type))
    + return -EINVAL;
    +
    + /*
    + * VSEC may have more than 1 mailbox instance for the card
    + * which has more than 1 physical function.
    + * This is not supported for now. Assuming only one mailbox
    + */
    +
    + snprintf(regmap_ver, sizeof(regmap_ver) - 1, "%d-%d.%d.%d",
    + p_entry->ver_type, p_entry->major, p_entry->minor,
    + GET_REV(p_entry));
    + ep.ep_name = type2epname(p_entry->type);
    + ep.bar = GET_BAR(p_entry);
    + ep.bar_off = GET_BAR_OFF(p_entry);
    + ep.size = type2size(p_entry->type);
    + ep.regmap = type2regmap(p_entry->type);
    + ep.regmap_ver = regmap_ver;
    + ret = xrt_md_add_endpoint(DEV(vsec->pdev), vsec->metadata, &ep);
    + if (ret) {
    + xrt_err(vsec->pdev, "add ep failed, ret %d", ret);
    + goto failed;
    + }
    +
    +failed:
    + return ret;
    +}
    +
    +static int xrt_vsec_create_metadata(struct xrt_vsec *vsec)
    +{
    + struct xrt_vsec_entry entry;
    + int i, ret;
    +
    + ret = xrt_md_create(&vsec->pdev->dev, &vsec->metadata);
    + if (ret) {
    + xrt_err(vsec->pdev, "create metadata failed");
    + return ret;
    + }
    +
    + for (i = 0; i * sizeof(entry) < vsec->length -
    + sizeof(struct xrt_vsec_header); i++) {
    + read_entry(vsec, i, &entry);
    + xrt_vsec_add_node(vsec, vsec->metadata, &entry);
    + }
    +
    + return 0;
    +}
    +
    +static int xrt_vsec_ioctl(struct platform_device *pdev, u32 cmd, void *arg)
    +{
    + int ret = 0;
    +
    + switch (cmd) {
    + case XRT_XLEAF_EVENT:
    + /* Does not handle any event. */
    + break;
    + default:
    + ret = -EINVAL;
    + xrt_err(pdev, "should never been called");
    + break;
    + }
    +
    + return ret;
    +}
    +
    +static int xrt_vsec_mapio(struct xrt_vsec *vsec)
    +{
    + struct xrt_subdev_platdata *pdata = DEV_PDATA(vsec->pdev);
    + const u32 *bar;
    + const u64 *bar_off;
    + struct resource *res = NULL;
    + ulong addr;
    + int ret;
    +
    + if (!pdata || xrt_md_size(DEV(vsec->pdev), pdata->xsp_dtb) == XRT_MD_INVALID_LENGTH) {
    + xrt_err(vsec->pdev, "empty metadata");
    + return -EINVAL;
    + }
    +
    + ret = xrt_md_get_prop(DEV(vsec->pdev), pdata->xsp_dtb, XRT_MD_NODE_VSEC,
    + NULL, XRT_MD_PROP_BAR_IDX, (const void **)&bar, NULL);
    + if (ret) {
    + xrt_err(vsec->pdev, "failed to get bar idx, ret %d", ret);
    + return -EINVAL;
    + }
    +
    + ret = xrt_md_get_prop(DEV(vsec->pdev), pdata->xsp_dtb, XRT_MD_NODE_VSEC,
    + NULL, XRT_MD_PROP_OFFSET, (const void **)&bar_off, NULL);
    + if (ret) {
    + xrt_err(vsec->pdev, "failed to get bar off, ret %d", ret);
    + return -EINVAL;
    + }
    +
    + xrt_info(vsec->pdev, "Map vsec at bar %d, offset 0x%llx",
    + be32_to_cpu(*bar), be64_to_cpu(*bar_off));
    +
    + xleaf_get_barres(vsec->pdev, &res, be32_to_cpu(*bar));
    + if (!res) {
    + xrt_err(vsec->pdev, "failed to get bar addr");
    + return -EINVAL;
    + }
    +
    + addr = res->start + (ulong)be64_to_cpu(*bar_off);
    +
    + vsec->base = ioremap(addr, sizeof(struct xrt_vsec_header));
    + if (!vsec->base) {
    + xrt_err(vsec->pdev, "Map header failed");
    + return -EIO;
    + }
    +
    + vsec->length = head_rd(vsec, length);
    + iounmap(vsec->base);
    + vsec->base = ioremap(addr, vsec->length);
    + if (!vsec->base) {
    + xrt_err(vsec->pdev, "map failed");
    + return -EIO;
    + }
    +
    + return 0;
    +}
    +
    +static int xrt_vsec_remove(struct platform_device *pdev)
    +{
    + struct xrt_vsec *vsec;
    +
    + vsec = platform_get_drvdata(pdev);
    +
    + if (vsec->base) {
    + iounmap(vsec->base);
    + vsec->base = NULL;
    + }
    +
    + vfree(vsec->metadata);
    +
    + return 0;
    +}
    +
    +static int xrt_vsec_probe(struct platform_device *pdev)
    +{
    + struct xrt_vsec *vsec;
    + int ret = 0;
    +
    + vsec = devm_kzalloc(&pdev->dev, sizeof(*vsec), GFP_KERNEL);
    + if (!vsec)
    + return -ENOMEM;
    +
    + vsec->pdev = pdev;
    + platform_set_drvdata(pdev, vsec);
    +
    + ret = xrt_vsec_mapio(vsec);
    + if (ret)
    + goto failed;
    +
    + ret = xrt_vsec_create_metadata(vsec);
    + if (ret) {
    + xrt_err(pdev, "create metadata failed, ret %d", ret);
    + goto failed;
    + }
    + ret = xleaf_create_group(pdev, vsec->metadata);
    + if (ret < 0)
    + xrt_err(pdev, "create group failed, ret %d", ret);
    + else
    + ret = 0;
    +
    +failed:
    + if (ret)
    + xrt_vsec_remove(pdev);
    +
    + return ret;
    +}
    +
    +static struct xrt_subdev_endpoints xrt_vsec_endpoints[] = {
    + {
    + .xse_names = (struct xrt_subdev_ep_names []){
    + { .ep_name = XRT_MD_NODE_VSEC },
    + { NULL },
    + },
    + .xse_min_ep = 1,
    + },
    + { 0 },
    +};
    +
    +static struct xrt_subdev_drvdata xrt_vsec_data = {
    + .xsd_dev_ops = {
    + .xsd_ioctl = xrt_vsec_ioctl,
    + },
    +};
    +
    +static const struct platform_device_id xrt_vsec_table[] = {
    + { XRT_VSEC, (kernel_ulong_t)&xrt_vsec_data },
    + { },
    +};
    +
    +static struct platform_driver xrt_vsec_driver = {
    + .driver = {
    + .name = XRT_VSEC,
    + },
    + .probe = xrt_vsec_probe,
    + .remove = xrt_vsec_remove,
    + .id_table = xrt_vsec_table,
    +};
    +
    +void vsec_leaf_init_fini(bool init)
    +{
    + if (init)
    + xleaf_register_driver(XRT_SUBDEV_VSEC, &xrt_vsec_driver, xrt_vsec_endpoints);
    + else
    + xleaf_unregister_driver(XRT_SUBDEV_VSEC);
    +}
    --
    2.18.4
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      Last update: 2021-02-18 08:51    [W:3.764 / U:0.356 seconds]
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