Date:   Wed, 17 Feb 2021 22:40:11 -0800
From:   Lizhi Hou <lizhi.hou@...inx.com>
To:     <linux-kernel@...r.kernel.org>
CC:     Lizhi Hou <lizhih@...inx.com>, <linux-fpga@...r.kernel.org>,
        <maxz@...inx.com>, <sonal.santan@...inx.com>,
        <michal.simek@...inx.com>, <stefanos@...inx.com>,
        <devicetree@...r.kernel.org>, <trix@...hat.com>, <mdf@...nel.org>,
        <robh@...nel.org>, Max Zhen <max.zhen@...inx.com>
Subject: [PATCH V3 XRT Alveo 10/18] fpga: xrt: VSEC platform driver

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@...inx.com>
Signed-off-by: Max Zhen <max.zhen@...inx.com>
Signed-off-by: Lizhi Hou <lizhih@...inx.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@...inx.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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