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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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