linux-kernel - Re: [PATCH V4 XRT Alveo 13/20] fpga: xrt: User Clock Subsystem platform driver

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Message-ID: <a5db6c62-e716-1ea8-ad7a-e5ea5adc5c23@redhat.com>
Date:   Fri, 2 Apr 2021 07:27:24 -0700
From:   Tom Rix <trix@...hat.com>
To:     Lizhi Hou <lizhi.hou@...inx.com>, linux-kernel@...r.kernel.org
Cc:     linux-fpga@...r.kernel.org, maxz@...inx.com,
        sonal.santan@...inx.com, yliu@...inx.com, michal.simek@...inx.com,
        stefanos@...inx.com, devicetree@...r.kernel.org, mdf@...nel.org,
        robh@...nel.org, Max Zhen <max.zhen@...inx.com>
Subject: Re: [PATCH V4 XRT Alveo 13/20] fpga: xrt: User Clock Subsystem
 platform driver


On 3/23/21 10:29 PM, Lizhi Hou wrote:
> Add User Clock Subsystem (UCS) driver. UCS is a hardware function
ok
> discovered by walking xclbin metadata. A platform device node will be
> created for it.  UCS enables/disables the dynamic region clocks.
>
> Signed-off-by: Sonal Santan <sonal.santan@...inx.com>
> Signed-off-by: Max Zhen <max.zhen@...inx.com>
> Signed-off-by: Lizhi Hou <lizhi.hou@...inx.com>
> ---
>  drivers/fpga/xrt/lib/xleaf/ucs.c | 167 +++++++++++++++++++++++++++++++
ok on removing ucs.h
>  1 file changed, 167 insertions(+)
>  create mode 100644 drivers/fpga/xrt/lib/xleaf/ucs.c
>
> diff --git a/drivers/fpga/xrt/lib/xleaf/ucs.c b/drivers/fpga/xrt/lib/xleaf/ucs.c
> new file mode 100644
> index 000000000000..d91ee229e7cb
> --- /dev/null
> +++ b/drivers/fpga/xrt/lib/xleaf/ucs.c
> @@ -0,0 +1,167 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Xilinx Alveo FPGA UCS Driver
> + *
> + * Copyright (C) 2020-2021 Xilinx, Inc.
> + *
> + * Authors:
> + *      Lizhi Hou<Lizhi.Hou@...inx.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/clock.h"
> +
> +#define UCS_ERR(ucs, fmt, arg...)   \
> +	xrt_err((ucs)->pdev, fmt "\n", ##arg)
> +#define UCS_WARN(ucs, fmt, arg...)  \
> +	xrt_warn((ucs)->pdev, fmt "\n", ##arg)
> +#define UCS_INFO(ucs, fmt, arg...)  \
> +	xrt_info((ucs)->pdev, fmt "\n", ##arg)
> +#define UCS_DBG(ucs, fmt, arg...)   \
> +	xrt_dbg((ucs)->pdev, fmt "\n", ##arg)
> +
> +#define XRT_UCS		"xrt_ucs"
> +
> +#define XRT_UCS_CHANNEL1_REG			0
> +#define XRT_UCS_CHANNEL2_REG			8
> +
> +#define CLK_MAX_VALUE			6400
> +
> +static const struct regmap_config ucs_regmap_config = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.max_register = 0x1000,
> +};
> +
> +struct xrt_ucs {
> +	struct platform_device	*pdev;
> +	struct regmap		*regmap;
ok
> +	struct mutex		ucs_lock; /* ucs dev lock */
> +};
> +
> +static void xrt_ucs_event_cb(struct platform_device *pdev, void *arg)
> +{
> +	struct xrt_event *evt = (struct xrt_event *)arg;
> +	enum xrt_events e = evt->xe_evt;
> +	struct platform_device *leaf;
> +	enum xrt_subdev_id id;
> +	int instance;
> +
> +	id = evt->xe_subdev.xevt_subdev_id;
> +	instance = evt->xe_subdev.xevt_subdev_instance;
> +
> +	if (e != XRT_EVENT_POST_CREATION) {
> +		xrt_dbg(pdev, "ignored event %d", e);
> +		return;
> +	}
> +
> +	if (id != XRT_SUBDEV_CLOCK)
> +		return;
ok
> +
> +	leaf = xleaf_get_leaf_by_id(pdev, XRT_SUBDEV_CLOCK, instance);
> +	if (!leaf) {
> +		xrt_err(pdev, "does not get clock subdev");
> +		return;
> +	}
> +
> +	xleaf_call(leaf, XRT_CLOCK_VERIFY, NULL);
> +	xleaf_put_leaf(pdev, leaf);
> +}
ok on removing ucs_check.
> +
> +static int ucs_enable(struct xrt_ucs *ucs)
> +{
> +	int ret;
> +
> +	mutex_lock(&ucs->ucs_lock);
ok
> +	ret = regmap_write(ucs->regmap, XRT_UCS_CHANNEL2_REG, 1);
> +	mutex_unlock(&ucs->ucs_lock);
> +
> +	return ret;
> +}
> +
> +static int
> +xrt_ucs_leaf_call(struct platform_device *pdev, u32 cmd, void *arg)

ok

Looks fine.

Reviewed-by: Tom Rix <trix@...hat.com>

> +{
> +	switch (cmd) {
> +	case XRT_XLEAF_EVENT:
> +		xrt_ucs_event_cb(pdev, arg);
> +		break;
> +	default:
> +		xrt_err(pdev, "unsupported cmd %d", cmd);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int ucs_probe(struct platform_device *pdev)
> +{
> +	struct xrt_ucs *ucs = NULL;
> +	void __iomem *base = NULL;
> +	struct resource *res;
> +
> +	ucs = devm_kzalloc(&pdev->dev, sizeof(*ucs), GFP_KERNEL);
> +	if (!ucs)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, ucs);
> +	ucs->pdev = pdev;
> +	mutex_init(&ucs->ucs_lock);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -EINVAL;
> +
> +	base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	ucs->regmap = devm_regmap_init_mmio(&pdev->dev, base, &ucs_regmap_config);
> +	if (IS_ERR(ucs->regmap)) {
> +		UCS_ERR(ucs, "map base %pR failed", res);
> +		return PTR_ERR(ucs->regmap);
> +	}
> +	ucs_enable(ucs);
> +
> +	return 0;
> +}
> +
> +static struct xrt_subdev_endpoints xrt_ucs_endpoints[] = {
> +	{
> +		.xse_names = (struct xrt_subdev_ep_names[]) {
> +			{ .ep_name = XRT_MD_NODE_UCS_CONTROL_STATUS },
> +			{ NULL },
> +		},
> +		.xse_min_ep = 1,
> +	},
> +	{ 0 },
> +};
> +
> +static struct xrt_subdev_drvdata xrt_ucs_data = {
> +	.xsd_dev_ops = {
> +		.xsd_leaf_call = xrt_ucs_leaf_call,
> +	},
> +};
> +
> +static const struct platform_device_id xrt_ucs_table[] = {
> +	{ XRT_UCS, (kernel_ulong_t)&xrt_ucs_data },
> +	{ },
> +};
> +
> +static struct platform_driver xrt_ucs_driver = {
> +	.driver = {
> +		.name = XRT_UCS,
> +	},
> +	.probe = ucs_probe,
> +	.id_table = xrt_ucs_table,
> +};
> +
> +XRT_LEAF_INIT_FINI_FUNC(XRT_SUBDEV_UCS, ucs);