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Date: Fri, 19 Oct 2018 14:23:44 -0700
From: Moritz Fischer <moritz.fischer.private@...il.com>
To: nava.manne@...inx.com
Cc: Alan Tull <atull@...nel.org>, Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Michal Simek <michal.simek@...inx.com>, rajanv@...inx.com,
jollys@...inx.com, linux-fpga@...r.kernel.org,
Devicetree List <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
chinnikishore369@...il.com
Subject: Re: [PATCH 3/3] fpga manager: Adding FPGA Manager support for Xilinx zynqmp
Hi Nava,
Looks good to me, a couple of nits inline below.
On Fri, Oct 19, 2018 at 1:50 AM Nava kishore Manne
<nava.manne@...inx.com> wrote:
>
> This patch adds FPGA Manager support for the Xilinx
> ZynqMp chip.
Isn't it ZynqMP ?
>
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
> Changes for v1:
> -None.
>
> Changes for RFC-V2:
> -Updated the Fpga Mgr registrations call's
> to 4.18
>
> drivers/fpga/Kconfig | 9 +++
> drivers/fpga/Makefile | 1 +
> drivers/fpga/zynqmp-fpga.c | 159 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 169 insertions(+)
> create mode 100644 drivers/fpga/zynqmp-fpga.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index 1ebcef4bab5b..26ebbcf3d3a3 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -56,6 +56,15 @@ config FPGA_MGR_ZYNQ_FPGA
> help
> FPGA manager driver support for Xilinx Zynq FPGAs.
>
> +config FPGA_MGR_ZYNQMP_FPGA
> + tristate "Xilinx Zynqmp FPGA"
> + depends on ARCH_ZYNQMP || COMPILE_TEST
> + help
> + FPGA manager driver support for Xilinx ZynqMP FPGAs.
> + This driver uses processor configuration port(PCAP)
This driver uses *the* processor configuration port.
> + to configure the programmable logic(PL) through PS
> + on ZynqMP SoC.
> +
> config FPGA_MGR_XILINX_SPI
> tristate "Xilinx Configuration over Slave Serial (SPI)"
> depends on SPI
> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
> index 7a2d73ba7122..3488ebbaee46 100644
> --- a/drivers/fpga/Makefile
> +++ b/drivers/fpga/Makefile
> @@ -16,6 +16,7 @@ obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10) += socfpga-a10.o
> obj-$(CONFIG_FPGA_MGR_TS73XX) += ts73xx-fpga.o
> obj-$(CONFIG_FPGA_MGR_XILINX_SPI) += xilinx-spi.o
> obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA) += zynq-fpga.o
> +obj-$(CONFIG_FPGA_MGR_ZYNQMP_FPGA) += zynqmp-fpga.o
> obj-$(CONFIG_ALTERA_PR_IP_CORE) += altera-pr-ip-core.o
> obj-$(CONFIG_ALTERA_PR_IP_CORE_PLAT) += altera-pr-ip-core-plat.o
>
> diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
> new file mode 100644
> index 000000000000..2760d7e3872a
> --- /dev/null
> +++ b/drivers/fpga/zynqmp-fpga.c
> @@ -0,0 +1,159 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 Xilinx, Inc.
> + */
> +
> +#include <linux/dma-mapping.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/string.h>
> +#include <linux/firmware/xlnx-zynqmp.h>
> +
> +/* Constant Definitions */
> +#define IXR_FPGA_DONE_MASK 0X00000008U
> +
> +/**
> + * struct zynqmp_fpga_priv - Private data structure
> + * @dev: Device data structure
> + * @flags: flags which is used to identify the bitfile type
> + */
> +struct zynqmp_fpga_priv {
> + struct device *dev;
> + u32 flags;
> +};
> +
> +static int zynqmp_fpga_ops_write_init(struct fpga_manager *mgr,
> + struct fpga_image_info *info,
> + const char *buf, size_t size)
> +{
> + struct zynqmp_fpga_priv *priv;
> +
> + priv = mgr->priv;
> + priv->flags = info->flags;
> +
> + return 0;
> +}
> +
> +static int zynqmp_fpga_ops_write(struct fpga_manager *mgr,
> + const char *buf, size_t size)
> +{
> + struct zynqmp_fpga_priv *priv;
> + char *kbuf;
> + dma_addr_t dma_addr;
> + int ret;
> + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
Reverse xmas-tree please, i.e. long lines first.
> +
> + if (!eemi_ops || !eemi_ops->fpga_load)
> + return -ENXIO;
> +
> + priv = mgr->priv;
> +
> + kbuf = dma_alloc_coherent(priv->dev, size, &dma_addr, GFP_KERNEL);
> + if (!kbuf)
> + return -ENOMEM;
> +
> + memcpy(kbuf, buf, size);
> +
> + wmb(); /* ensure all writes are done before initiate FW call */
> +
> + ret = eemi_ops->fpga_load(dma_addr, size, priv->flags);
> +
> + dma_free_coherent(priv->dev, size, kbuf, dma_addr);
> +
> + return ret;
> +}
> +
> +static int zynqmp_fpga_ops_write_complete(struct fpga_manager *mgr,
> + struct fpga_image_info *info)
> +{
> + return 0;
> +}
> +
> +static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr)
> +{
> + u32 status;
> + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
Same here, split it up if necessary.
> +
> + if (!eemi_ops || !eemi_ops->fpga_get_status)
> + return FPGA_MGR_STATE_UNKNOWN;
> +
> + eemi_ops->fpga_get_status(&status);
> + if (status & IXR_FPGA_DONE_MASK)
> + return FPGA_MGR_STATE_OPERATING;
> +
> + return FPGA_MGR_STATE_UNKNOWN;
> +}
> +
> +static const struct fpga_manager_ops zynqmp_fpga_ops = {
> + .state = zynqmp_fpga_ops_state,
> + .write_init = zynqmp_fpga_ops_write_init,
> + .write = zynqmp_fpga_ops_write,
> + .write_complete = zynqmp_fpga_ops_write_complete,
> +};
> +
> +static int zynqmp_fpga_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct zynqmp_fpga_priv *priv;
> + struct fpga_manager *mgr;
> + int err, ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->dev = dev;
> + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
> + if (ret < 0)
> + dev_err(dev, "no usable DMA configuration");
Do you wanna do something about this error if it happens? Return 'ret' maybe?
> +
> + mgr = fpga_mgr_create(dev, "Xilinx ZynqMP FPGA Manager",
> + &zynqmp_fpga_ops, priv);
> + if (!mgr)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, mgr);
> +
> + err = fpga_mgr_register(mgr);
> + if (err) {
> + dev_err(dev, "unable to register FPGA manager");
> + fpga_mgr_free(mgr);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int zynqmp_fpga_remove(struct platform_device *pdev)
> +{
> + struct fpga_manager *mgr = platform_get_drvdata(pdev);
> +
> + fpga_mgr_unregister(mgr);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id zynqmp_fpga_of_match[] = {
> + { .compatible = "xlnx,zynqmp-pcap-fpga", },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, zynqmp_fpga_of_match);
> +
> +static struct platform_driver zynqmp_fpga_driver = {
> + .probe = zynqmp_fpga_probe,
> + .remove = zynqmp_fpga_remove,
> + .driver = {
> + .name = "zynqmp_fpga_manager",
> + .of_match_table = of_match_ptr(zynqmp_fpga_of_match),
> + },
> +};
> +
> +module_platform_driver(zynqmp_fpga_driver);
> +
> +MODULE_AUTHOR("Nava kishore Manne <navam@...inx.com>");
> +MODULE_DESCRIPTION("Xilinx ZynqMp FPGA Manager");
> +MODULE_LICENSE("GPL");
> --
> 2.18.0
>
Thanks,
Moritz
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