From: Lizhi Hou <lizhi.hou@xilinx.com>
To: <linux-kernel@vger.kernel.org>
Cc: Lizhi Hou <lizhi.hou@xilinx.com>, <linux-fpga@vger.kernel.org>,
<maxz@xilinx.com>, <sonal.santan@xilinx.com>, <yliu@xilinx.com>,
<michal.simek@xilinx.com>, <stefanos@xilinx.com>,
<devicetree@vger.kernel.org>, <trix@redhat.com>, <mdf@kernel.org>,
<robh@kernel.org>, Max Zhen <max.zhen@xilinx.com>
Subject: [PATCH V4 XRT Alveo 19/20] fpga: xrt: partition isolation platform driver
Date: Tue, 23 Mar 2021 22:29:46 -0700 [thread overview]
Message-ID: <20210324052947.27889-20-lizhi.hou@xilinx.com> (raw)
In-Reply-To: <20210324052947.27889-1-lizhi.hou@xilinx.com>
Add partition isolation platform driver. partition isolation is
a hardware function discovered by walking firmware metadata.
A platform device node will be created for it. Partition isolation
function isolate the different fpga regions
Signed-off-by: Sonal Santan <sonal.santan@xilinx.com>
Signed-off-by: Max Zhen <max.zhen@xilinx.com>
Signed-off-by: Lizhi Hou <lizhi.hou@xilinx.com>
---
drivers/fpga/xrt/include/xleaf/axigate.h | 23 ++
drivers/fpga/xrt/lib/xleaf/axigate.c | 342 +++++++++++++++++++++++
2 files changed, 365 insertions(+)
create mode 100644 drivers/fpga/xrt/include/xleaf/axigate.h
create mode 100644 drivers/fpga/xrt/lib/xleaf/axigate.c
diff --git a/drivers/fpga/xrt/include/xleaf/axigate.h b/drivers/fpga/xrt/include/xleaf/axigate.h
new file mode 100644
index 000000000000..58f32c76dca1
--- /dev/null
+++ b/drivers/fpga/xrt/include/xleaf/axigate.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou <Lizhi.Hou@xilinx.com>
+ */
+
+#ifndef _XRT_AXIGATE_H_
+#define _XRT_AXIGATE_H_
+
+#include "xleaf.h"
+#include "metadata.h"
+
+/*
+ * AXIGATE driver leaf calls.
+ */
+enum xrt_axigate_leaf_cmd {
+ XRT_AXIGATE_CLOSE = XRT_XLEAF_CUSTOM_BASE, /* See comments in xleaf.h */
+ XRT_AXIGATE_OPEN,
+};
+
+#endif /* _XRT_AXIGATE_H_ */
diff --git a/drivers/fpga/xrt/lib/xleaf/axigate.c b/drivers/fpga/xrt/lib/xleaf/axigate.c
new file mode 100644
index 000000000000..231bb0335278
--- /dev/null
+++ b/drivers/fpga/xrt/lib/xleaf/axigate.c
@@ -0,0 +1,342 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xilinx Alveo FPGA AXI Gate Driver
+ *
+ * Copyright (C) 2020-2021 Xilinx, Inc.
+ *
+ * Authors:
+ * Lizhi Hou<Lizhi.Hou@xilinx.com>
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/io.h>
+#include "metadata.h"
+#include "xleaf.h"
+#include "xleaf/axigate.h"
+
+#define XRT_AXIGATE "xrt_axigate"
+
+#define XRT_AXIGATE_WRITE_REG 0
+#define XRT_AXIGATE_READ_REG 8
+
+#define XRT_AXIGATE_CTRL_CLOSE 0
+#define XRT_AXIGATE_CTRL_OPEN_BIT0 1
+#define XRT_AXIGATE_CTRL_OPEN_BIT1 2
+
+#define XRT_AXIGATE_INTERVAL 500 /* ns */
+
+struct xrt_axigate {
+ struct platform_device *pdev;
+ struct regmap *regmap;
+ struct mutex gate_lock; /* gate dev lock */
+
+ void *evt_hdl;
+ const char *ep_name;
+
+ bool gate_closed;
+};
+
+static const struct regmap_config axigate_regmap_config = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = 0x1000,
+};
+
+/* the ep names are in the order of hardware layers */
+static const char * const xrt_axigate_epnames[] = {
+ XRT_MD_NODE_GATE_PLP, /* PLP: Provider Logic Partition */
+ XRT_MD_NODE_GATE_ULP /* ULP: User Logic Partition */
+};
+
+static inline int close_gate(struct xrt_axigate *gate)
+{
+ u32 val;
+ int ret;
+
+ ret = regmap_write(gate->regmap, XRT_AXIGATE_WRITE_REG, XRT_AXIGATE_CTRL_CLOSE);
+ if (ret) {
+ xrt_err(gate->pdev, "write gate failed %d", ret);
+ return ret;
+ }
+ ndelay(XRT_AXIGATE_INTERVAL);
+ /*
+ * Legacy hardware requires extra read work properly.
+ * This is not on critical path, thus the extra read should not impact performance much.
+ */
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &val);
+ if (ret) {
+ xrt_err(gate->pdev, "read gate failed %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static inline int open_gate(struct xrt_axigate *gate)
+{
+ u32 val;
+ int ret;
+
+ ret = regmap_write(gate->regmap, XRT_AXIGATE_WRITE_REG, XRT_AXIGATE_CTRL_OPEN_BIT1);
+ if (ret) {
+ xrt_err(gate->pdev, "write 2 failed %d", ret);
+ return ret;
+ }
+ ndelay(XRT_AXIGATE_INTERVAL);
+ /*
+ * Legacy hardware requires extra read work properly.
+ * This is not on critical path, thus the extra read should not impact performance much.
+ */
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &val);
+ if (ret) {
+ xrt_err(gate->pdev, "read 2 failed %d", ret);
+ return ret;
+ }
+ ret = regmap_write(gate->regmap, XRT_AXIGATE_WRITE_REG,
+ XRT_AXIGATE_CTRL_OPEN_BIT0 | XRT_AXIGATE_CTRL_OPEN_BIT1);
+ if (ret) {
+ xrt_err(gate->pdev, "write 3 failed %d", ret);
+ return ret;
+ }
+ ndelay(XRT_AXIGATE_INTERVAL);
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &val);
+ if (ret) {
+ xrt_err(gate->pdev, "read 3 failed %d", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int xrt_axigate_epname_idx(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret, i;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ xrt_err(pdev, "Empty Resource!");
+ return -EINVAL;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(xrt_axigate_epnames); i++) {
+ ret = strncmp(xrt_axigate_epnames[i], res->name,
+ strlen(xrt_axigate_epnames[i]) + 1);
+ if (!ret)
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+static int xrt_axigate_close(struct platform_device *pdev)
+{
+ struct xrt_axigate *gate;
+ u32 status = 0;
+ int ret;
+
+ gate = platform_get_drvdata(pdev);
+
+ mutex_lock(&gate->gate_lock);
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &status);
+ if (ret) {
+ xrt_err(pdev, "read gate failed %d", ret);
+ goto failed;
+ }
+ if (status) { /* gate is opened */
+ xleaf_broadcast_event(pdev, XRT_EVENT_PRE_GATE_CLOSE, false);
+ ret = close_gate(gate);
+ if (ret)
+ goto failed;
+ }
+
+ gate->gate_closed = true;
+
+failed:
+ mutex_unlock(&gate->gate_lock);
+
+ xrt_info(pdev, "close gate %s", gate->ep_name);
+ return ret;
+}
+
+static int xrt_axigate_open(struct platform_device *pdev)
+{
+ struct xrt_axigate *gate;
+ u32 status;
+ int ret;
+
+ gate = platform_get_drvdata(pdev);
+
+ mutex_lock(&gate->gate_lock);
+ ret = regmap_read(gate->regmap, XRT_AXIGATE_READ_REG, &status);
+ if (ret) {
+ xrt_err(pdev, "read gate failed %d", ret);
+ goto failed;
+ }
+ if (!status) { /* gate is closed */
+ ret = open_gate(gate);
+ if (ret)
+ goto failed;
+ xleaf_broadcast_event(pdev, XRT_EVENT_POST_GATE_OPEN, true);
+ /* xrt_axigate_open() could be called in event cb, thus
+ * we can not wait for the completes
+ */
+ }
+
+ gate->gate_closed = false;
+
+failed:
+ mutex_unlock(&gate->gate_lock);
+
+ xrt_info(pdev, "open gate %s", gate->ep_name);
+ return ret;
+}
+
+static void xrt_axigate_event_cb(struct platform_device *pdev, void *arg)
+{
+ struct xrt_axigate *gate = platform_get_drvdata(pdev);
+ struct xrt_event *evt = (struct xrt_event *)arg;
+ enum xrt_events e = evt->xe_evt;
+ struct platform_device *leaf;
+ enum xrt_subdev_id id;
+ struct resource *res;
+ int instance;
+
+ if (e != XRT_EVENT_POST_CREATION)
+ return;
+
+ instance = evt->xe_subdev.xevt_subdev_instance;
+ id = evt->xe_subdev.xevt_subdev_id;
+ if (id != XRT_SUBDEV_AXIGATE)
+ return;
+
+ leaf = xleaf_get_leaf_by_id(pdev, id, instance);
+ if (!leaf)
+ return;
+
+ res = platform_get_resource(leaf, IORESOURCE_MEM, 0);
+ if (!res || !strncmp(res->name, gate->ep_name, strlen(res->name) + 1)) {
+ xleaf_put_leaf(pdev, leaf);
+ return;
+ }
+
+ /* higher level axigate instance created, make sure the gate is opened. */
+ if (xrt_axigate_epname_idx(leaf) > xrt_axigate_epname_idx(pdev))
+ xrt_axigate_open(pdev);
+ else
+ xleaf_call(leaf, XRT_AXIGATE_OPEN, NULL);
+
+ xleaf_put_leaf(pdev, leaf);
+}
+
+static int
+xrt_axigate_leaf_call(struct platform_device *pdev, u32 cmd, void *arg)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case XRT_XLEAF_EVENT:
+ xrt_axigate_event_cb(pdev, arg);
+ break;
+ case XRT_AXIGATE_CLOSE:
+ ret = xrt_axigate_close(pdev);
+ break;
+ case XRT_AXIGATE_OPEN:
+ ret = xrt_axigate_open(pdev);
+ break;
+ default:
+ xrt_err(pdev, "unsupported cmd %d", cmd);
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int xrt_axigate_probe(struct platform_device *pdev)
+{
+ struct xrt_axigate *gate = NULL;
+ void __iomem *base = NULL;
+ struct resource *res;
+ int ret;
+
+ gate = devm_kzalloc(&pdev->dev, sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ return -ENOMEM;
+
+ gate->pdev = pdev;
+ platform_set_drvdata(pdev, gate);
+
+ xrt_info(pdev, "probing...");
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ xrt_err(pdev, "Empty resource 0");
+ ret = -EINVAL;
+ goto failed;
+ }
+
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base)) {
+ xrt_err(pdev, "map base iomem failed");
+ ret = PTR_ERR(base);
+ goto failed;
+ }
+
+ gate->regmap = devm_regmap_init_mmio(&pdev->dev, base, &axigate_regmap_config);
+ if (IS_ERR(gate->regmap)) {
+ xrt_err(pdev, "regmap %pR failed", res);
+ ret = PTR_ERR(gate->regmap);
+ goto failed;
+ }
+ gate->ep_name = res->name;
+
+ mutex_init(&gate->gate_lock);
+
+ return 0;
+
+failed:
+ return ret;
+}
+
+static struct xrt_subdev_endpoints xrt_axigate_endpoints[] = {
+ {
+ .xse_names = (struct xrt_subdev_ep_names[]) {
+ { .ep_name = XRT_MD_NODE_GATE_ULP },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ {
+ .xse_names = (struct xrt_subdev_ep_names[]) {
+ { .ep_name = XRT_MD_NODE_GATE_PLP },
+ { NULL },
+ },
+ .xse_min_ep = 1,
+ },
+ { 0 },
+};
+
+static struct xrt_subdev_drvdata xrt_axigate_data = {
+ .xsd_dev_ops = {
+ .xsd_leaf_call = xrt_axigate_leaf_call,
+ },
+};
+
+static const struct platform_device_id xrt_axigate_table[] = {
+ { XRT_AXIGATE, (kernel_ulong_t)&xrt_axigate_data },
+ { },
+};
+
+static struct platform_driver xrt_axigate_driver = {
+ .driver = {
+ .name = XRT_AXIGATE,
+ },
+ .probe = xrt_axigate_probe,
+ .id_table = xrt_axigate_table,
+};
+
+XRT_LEAF_INIT_FINI_FUNC(XRT_SUBDEV_AXIGATE, axigate);
--
2.27.0
next prev parent reply other threads:[~2021-03-24 5:37 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-24 5:29 [PATCH V4 XRT Alveo 00/20] XRT Alveo driver overview Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 01/20] Documentation: fpga: Add a document describing XRT Alveo drivers Lizhi Hou
2021-03-27 14:37 ` Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 02/20] fpga: xrt: driver metadata helper functions Lizhi Hou
2021-03-28 15:30 ` Tom Rix
2021-04-06 4:36 ` Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 03/20] fpga: xrt: xclbin file " Lizhi Hou
2021-03-29 17:12 ` Tom Rix
2021-04-06 17:52 ` Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 04/20] fpga: xrt: xrt-lib platform driver manager Lizhi Hou
2021-03-29 19:44 ` Tom Rix
2021-04-06 20:59 ` Max Zhen
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 05/20] fpga: xrt: group platform driver Lizhi Hou
2021-03-30 12:52 ` Tom Rix
2021-04-06 21:42 ` Max Zhen
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 06/20] fpga: xrt: char dev node helper functions Lizhi Hou
2021-03-30 13:45 ` Tom Rix
2021-04-06 16:29 ` Max Zhen
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 07/20] fpga: xrt: root driver infrastructure Lizhi Hou
2021-03-30 15:11 ` Tom Rix
2021-04-05 20:53 ` Max Zhen
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 08/20] fpga: xrt: platform " Lizhi Hou
2021-03-31 12:50 ` Tom Rix
2021-04-08 17:09 ` Max Zhen
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 09/20] fpga: xrt: management physical function driver (root) Lizhi Hou
2021-03-31 13:03 ` Tom Rix
2021-04-09 18:50 ` Max Zhen
2021-04-14 15:40 ` Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 10/20] fpga: xrt: main platform driver for management function device Lizhi Hou
2021-04-01 14:07 ` Tom Rix
2021-04-07 22:37 ` Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 11/20] fpga: xrt: fpga-mgr and region implementation for xclbin download Lizhi Hou
2021-04-01 14:43 ` Tom Rix
2021-04-07 22:41 ` Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 12/20] fpga: xrt: VSEC platform driver Lizhi Hou
2021-04-02 14:12 ` Tom Rix
2021-04-06 21:01 ` Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 13/20] fpga: xrt: User Clock Subsystem " Lizhi Hou
2021-04-02 14:27 ` Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 14/20] fpga: xrt: ICAP " Lizhi Hou
2021-04-06 13:50 ` Tom Rix
2021-04-06 23:00 ` Lizhi Hou
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 15/20] fpga: xrt: devctl " Lizhi Hou
2021-04-06 14:18 ` Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 16/20] fpga: xrt: clock " Lizhi Hou
2021-04-06 20:11 ` Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 17/20] fpga: xrt: clock frequency counter " Lizhi Hou
2021-04-06 20:32 ` Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 18/20] fpga: xrt: DDR calibration " Lizhi Hou
2021-04-06 20:37 ` Tom Rix
2021-03-24 5:29 ` Lizhi Hou [this message]
2021-04-06 20:46 ` [PATCH V4 XRT Alveo 19/20] fpga: xrt: partition isolation " Tom Rix
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 20/20] fpga: xrt: Kconfig and Makefile updates for XRT drivers Lizhi Hou
2021-04-06 21:00 ` Tom Rix
2021-04-06 23:39 ` Lizhi Hou
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