From: Tom Rix <trix@redhat.com>
To: Lizhi Hou <lizhi.hou@xilinx.com>, linux-kernel@vger.kernel.org
Cc: 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, mdf@kernel.org, robh@kernel.org,
Max Zhen <max.zhen@xilinx.com>
Subject: Re: [PATCH V4 XRT Alveo 18/20] fpga: xrt: DDR calibration platform driver
Date: Tue, 6 Apr 2021 13:37:28 -0700 [thread overview]
Message-ID: <e529c014-f2d5-a0d2-dba9-4325af41c425@redhat.com> (raw)
In-Reply-To: <20210324052947.27889-19-lizhi.hou@xilinx.com>
On 3/23/21 10:29 PM, Lizhi Hou wrote:
> Add DDR calibration driver. DDR calibration is a hardware function
> discovered by walking firmware metadata. A platform device node will
> be created for it. Hardware provides DDR calibration status through
> this function.
>
> 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>
> ---
> .../fpga/xrt/include/xleaf/ddr_calibration.h | 28 +++
> drivers/fpga/xrt/lib/xleaf/ddr_calibration.c | 226 ++++++++++++++++++
ok
> 2 files changed, 254 insertions(+)
> create mode 100644 drivers/fpga/xrt/include/xleaf/ddr_calibration.h
> create mode 100644 drivers/fpga/xrt/lib/xleaf/ddr_calibration.c
>
> diff --git a/drivers/fpga/xrt/include/xleaf/ddr_calibration.h b/drivers/fpga/xrt/include/xleaf/ddr_calibration.h
> new file mode 100644
> index 000000000000..878740c26ca2
> --- /dev/null
> +++ b/drivers/fpga/xrt/include/xleaf/ddr_calibration.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2020-2021 Xilinx, Inc.
> + *
> + * Authors:
> + * Cheng Zhen <maxz@xilinx.com>
> + */
> +
> +#ifndef _XRT_DDR_CALIBRATION_H_
> +#define _XRT_DDR_CALIBRATION_H_
> +
> +#include "xleaf.h"
> +#include <linux/xrt/xclbin.h>
> +
> +/*
> + * Memory calibration driver leaf calls.
> + */
> +enum xrt_calib_results {
> + XRT_CALIB_UNKNOWN = 0,
ok
> + XRT_CALIB_SUCCEEDED,
> + XRT_CALIB_FAILED,
> +};
> +
> +enum xrt_calib_leaf_cmd {
> + XRT_CALIB_RESULT = XRT_XLEAF_CUSTOM_BASE, /* See comments in xleaf.h */
> +};
> +
> +#endif /* _XRT_DDR_CALIBRATION_H_ */
> diff --git a/drivers/fpga/xrt/lib/xleaf/ddr_calibration.c b/drivers/fpga/xrt/lib/xleaf/ddr_calibration.c
> new file mode 100644
> index 000000000000..5a9fa82946cb
> --- /dev/null
> +++ b/drivers/fpga/xrt/lib/xleaf/ddr_calibration.c
> @@ -0,0 +1,226 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Xilinx Alveo FPGA memory calibration driver
> + *
> + * Copyright (C) 2020-2021 Xilinx, Inc.
> + *
> + * memory calibration
> + *
> + * Authors:
> + * Lizhi Hou<Lizhi.Hou@xilinx.com>
> + */
> +#include <linux/delay.h>
> +#include <linux/regmap.h>
> +#include "xclbin-helper.h"
> +#include "metadata.h"
> +#include "xleaf/ddr_calibration.h"
> +
> +#define XRT_CALIB "xrt_calib"
> +
> +#define XRT_CALIB_STATUS_REG 0
> +#define XRT_CALIB_READ_RETRIES 20
> +#define XRT_CALIB_READ_INTERVAL 500 /* ms */
> +
> +static const struct regmap_config calib_regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> + .max_register = 0x1000,
ok
> +};
> +
> +struct calib_cache {
> + struct list_head link;
> + const char *ep_name;
> + char *data;
> + u32 data_size;
> +};
> +
> +struct calib {
> + struct platform_device *pdev;
> + struct regmap *regmap;
> + struct mutex lock; /* calibration dev lock */
> + struct list_head cache_list;
> + u32 cache_num;
> + enum xrt_calib_results result;
> +};
> +
> +static void __calib_cache_clean_nolock(struct calib *calib)
ok
> +{
> + struct calib_cache *cache, *temp;
> +
> + list_for_each_entry_safe(cache, temp, &calib->cache_list, link) {
> + vfree(cache->data);
> + list_del(&cache->link);
> + vfree(cache);
> + }
> + calib->cache_num = 0;
> +}
> +
> +static void calib_cache_clean(struct calib *calib)
> +{
> + mutex_lock(&calib->lock);
> + __calib_cache_clean_nolock(calib);
> + mutex_unlock(&calib->lock);
> +}
> +
> +static int calib_calibration(struct calib *calib)
> +{
> + u32 times = XRT_CALIB_READ_RETRIES;
ok
> + u32 status;
> + int ret;
> +
> + while (times != 0) {
> + ret = regmap_read(calib->regmap, XRT_CALIB_STATUS_REG, &status);
> + if (ret) {
> + xrt_err(calib->pdev, "failed to read status reg %d", ret);
> + return ret;
> + }
> +
> + if (status & BIT(0))
> + break;
> + msleep(XRT_CALIB_READ_INTERVAL);
ok
Reviewed-by: Tom Rix <trix@redhat.com>
> + times--;
> + }
> +
> + if (!times) {
> + xrt_err(calib->pdev,
> + "MIG calibration timeout after bitstream download");
> + return -ETIMEDOUT;
> + }
> +
> + xrt_info(calib->pdev, "took %dms", (XRT_CALIB_READ_RETRIES - times) *
> + XRT_CALIB_READ_INTERVAL);
> + return 0;
> +}
> +
> +static void xrt_calib_event_cb(struct platform_device *pdev, void *arg)
> +{
> + struct calib *calib = platform_get_drvdata(pdev);
> + struct xrt_event *evt = (struct xrt_event *)arg;
> + enum xrt_events e = evt->xe_evt;
> + enum xrt_subdev_id id;
> + int ret;
> +
> + id = evt->xe_subdev.xevt_subdev_id;
> +
> + switch (e) {
> + case XRT_EVENT_POST_CREATION:
> + if (id == XRT_SUBDEV_UCS) {
> + ret = calib_calibration(calib);
> + if (ret)
> + calib->result = XRT_CALIB_FAILED;
> + else
> + calib->result = XRT_CALIB_SUCCEEDED;
> + }
> + break;
> + default:
> + xrt_dbg(pdev, "ignored event %d", e);
> + break;
> + }
> +}
> +
> +static int xrt_calib_remove(struct platform_device *pdev)
> +{
> + struct calib *calib = platform_get_drvdata(pdev);
> +
> + calib_cache_clean(calib);
> +
> + return 0;
> +}
> +
> +static int xrt_calib_probe(struct platform_device *pdev)
> +{
> + void __iomem *base = NULL;
> + struct resource *res;
> + struct calib *calib;
> + int err = 0;
> +
> + calib = devm_kzalloc(&pdev->dev, sizeof(*calib), GFP_KERNEL);
> + if (!calib)
> + return -ENOMEM;
> +
> + calib->pdev = pdev;
> + platform_set_drvdata(pdev, calib);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + err = -EINVAL;
> + goto failed;
> + }
> +
> + base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(base)) {
> + err = PTR_ERR(base);
> + goto failed;
> + }
> +
> + calib->regmap = devm_regmap_init_mmio(&pdev->dev, base, &calib_regmap_config);
> + if (IS_ERR(calib->regmap)) {
> + xrt_err(pdev, "Map iomem failed");
> + err = PTR_ERR(calib->regmap);
> + goto failed;
> + }
> +
> + mutex_init(&calib->lock);
> + INIT_LIST_HEAD(&calib->cache_list);
> +
> + return 0;
> +
> +failed:
> + return err;
> +}
> +
> +static int
> +xrt_calib_leaf_call(struct platform_device *pdev, u32 cmd, void *arg)
> +{
> + struct calib *calib = platform_get_drvdata(pdev);
> + int ret = 0;
> +
> + switch (cmd) {
> + case XRT_XLEAF_EVENT:
> + xrt_calib_event_cb(pdev, arg);
> + break;
> + case XRT_CALIB_RESULT: {
> + enum xrt_calib_results *r = (enum xrt_calib_results *)arg;
> + *r = calib->result;
> + break;
> + }
> + default:
> + xrt_err(pdev, "unsupported cmd %d", cmd);
> + ret = -EINVAL;
> + }
> + return ret;
> +}
> +
> +static struct xrt_subdev_endpoints xrt_calib_endpoints[] = {
> + {
> + .xse_names = (struct xrt_subdev_ep_names[]) {
> + { .ep_name = XRT_MD_NODE_DDR_CALIB },
> + { NULL },
> + },
> + .xse_min_ep = 1,
> + },
> + { 0 },
> +};
> +
> +static struct xrt_subdev_drvdata xrt_calib_data = {
> + .xsd_dev_ops = {
> + .xsd_leaf_call = xrt_calib_leaf_call,
> + },
> +};
> +
> +static const struct platform_device_id xrt_calib_table[] = {
> + { XRT_CALIB, (kernel_ulong_t)&xrt_calib_data },
> + { },
> +};
> +
> +static struct platform_driver xrt_calib_driver = {
> + .driver = {
> + .name = XRT_CALIB,
> + },
> + .probe = xrt_calib_probe,
> + .remove = xrt_calib_remove,
> + .id_table = xrt_calib_table,
> +};
> +
> +XRT_LEAF_INIT_FINI_FUNC(XRT_SUBDEV_CALIB, calib);
next prev parent reply other threads:[~2021-04-06 20:37 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 [this message]
2021-03-24 5:29 ` [PATCH V4 XRT Alveo 19/20] fpga: xrt: partition isolation " Lizhi Hou
2021-04-06 20:46 ` 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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