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Message-ID: <Zdxe7mvBbHDHzbiS@yilunxu-OptiPlex-7050>
Date: Mon, 26 Feb 2024 17:50:38 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Charles Perry <charles.perry@...oirfairelinux.com>
Cc: mdf@...nel.org, avandiver@...kem-imaje.com, bcody@...kem-imaje.com,
Wu Hao <hao.wu@...el.com>, Xu Yilun <yilun.xu@...el.com>,
Tom Rix <trix@...hat.com>, Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Michal Simek <michal.simek@....com>, linux-fpga@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 3/3] fpga: xilinx-selectmap: add new driver
On Wed, Feb 21, 2024 at 02:50:49PM -0500, Charles Perry wrote:
> Xilinx 7 series FPGA can be programmed using a parallel port named
> the SelectMAP interface in the datasheet. This interface is compatible
> with the i.MX6 EIM bus controller but other types of external memory
> mapped parallel bus might work.
>
> xilinx-selectmap currently only supports the x8 mode where data is loaded
> at one byte per rising edge of the clock, with the MSb of each byte
> presented to the D0 pin.
>
> Signed-off-by: Charles Perry <charles.perry@...oirfairelinux.com>
> ---
> drivers/fpga/Kconfig | 8 +++
> drivers/fpga/Makefile | 1 +
> drivers/fpga/xilinx-selectmap.c | 97 +++++++++++++++++++++++++++++++++
> 3 files changed, 106 insertions(+)
> create mode 100644 drivers/fpga/xilinx-selectmap.c
>
> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
> index d27a1ebf40838..37b35f58f0dfb 100644
> --- a/drivers/fpga/Kconfig
> +++ b/drivers/fpga/Kconfig
> @@ -67,6 +67,14 @@ config FPGA_MGR_STRATIX10_SOC
> config FPGA_MGR_XILINX_CORE
> tristate
>
> +config FPGA_MGR_XILINX_SELECTMAP
> + tristate "Xilinx Configuration over SelectMAP"
> + depends on HAS_IOMEM
> + select FPGA_MGR_XILINX_CORE
> + help
> + FPGA manager driver support for Xilinx FPGA configuration
> + over SelectMAP interface.
> +
> 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 7ec795b6a5a70..aeb89bb13517e 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_STRATIX10_SOC) += stratix10-soc.o
> obj-$(CONFIG_FPGA_MGR_TS73XX) += ts73xx-fpga.o
> obj-$(CONFIG_FPGA_MGR_XILINX_CORE) += xilinx-core.o
> +obj-$(CONFIG_FPGA_MGR_XILINX_SELECTMAP) += xilinx-selectmap.o
> obj-$(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
> diff --git a/drivers/fpga/xilinx-selectmap.c b/drivers/fpga/xilinx-selectmap.c
> new file mode 100644
> index 0000000000000..b63f4623f8b2c
> --- /dev/null
> +++ b/drivers/fpga/xilinx-selectmap.c
> @@ -0,0 +1,97 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Xilinx Spartan6 and 7 Series SelectMAP interface driver
> + *
> + * (C) 2024 Charles Perry <charles.perry@...oirfairelinux.com>
> + *
> + * Manage Xilinx FPGA firmware loaded over the SelectMAP configuration
> + * interface.
> + */
> +
> +#include "xilinx-core.h"
> +
> +#include <linux/platform_device.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/of.h>
> +#include <linux/io.h>
> +
> +struct xilinx_selectmap_conf {
> + struct xilinx_fpga_core core;
> + void __iomem *base;
> +};
> +
> +#define to_xilinx_selectmap_conf(obj) \
> + container_of(obj, struct xilinx_selectmap_conf, core)
> +
> +static int xilinx_selectmap_write(struct xilinx_fpga_core *core,
> + const char *buf, size_t count)
> +{
> + struct xilinx_selectmap_conf *conf = to_xilinx_selectmap_conf(core);
> + u32 i;
> +
> + for (i = 0; i < count; ++i)
> + writeb(buf[i], conf->base);
> +
> + return 0;
> +}
> +
> +static int xilinx_selectmap_probe(struct platform_device *pdev)
> +{
> + struct xilinx_selectmap_conf *conf;
> + struct resource *r;
> + void __iomem *base;
> + struct gpio_desc *csi_b;
> + struct gpio_desc *rdwr_b;
> +
> + conf = devm_kzalloc(&pdev->dev, sizeof(*conf), GFP_KERNEL);
> + if (!conf)
> + return -ENOMEM;
> +
> + conf->core.dev = &pdev->dev;
> + conf->core.write = xilinx_selectmap_write;
> +
> + base = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
> + if (IS_ERR(base))
> + return dev_err_probe(&pdev->dev, PTR_ERR(base),
> + "ioremap error\n");
> + conf->base = base;
> +
> + /* CSI_B is active low */
> + csi_b = devm_gpiod_get_optional(&pdev->dev, "csi", GPIOD_OUT_HIGH);
> + if (IS_ERR(csi_b))
> + return dev_err_probe(&pdev->dev, PTR_ERR(csi_b),
> + "Failed to get CSI_B gpio\n");
> +
> + /* RDWR_B is active low */
> + rdwr_b = devm_gpiod_get_optional(&pdev->dev, "rdwr", GPIOD_OUT_HIGH);
> + if (IS_ERR(rdwr_b))
> + return dev_err_probe(&pdev->dev, PTR_ERR(rdwr_b),
> + "Failed to get RDWR_B gpio\n");
> +
> + return xilinx_core_probe(&conf->core);
> +}
> +
> +static const struct of_device_id xlnx_selectmap_of_match[] = {
> + { .compatible = "xlnx,fpga-xc7s-selectmap", }, // Spartan-7
> + { .compatible = "xlnx,fpga-xc7a-selectmap", }, // Artix-7
> + { .compatible = "xlnx,fpga-xc7k-selectmap", }, // Kintex-7
> + { .compatible = "xlnx,fpga-xc7v-selectmap", }, // Virtex-7
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, xlnx_selectmap_of_match);
Does the driver have to be used with OF or not?
If yes, please specify the reason and enforce in Kconfig.
If no, please ensure it decently compiles without CONFIG_OF.
Thanks,
Yilun
> +
> +static struct platform_driver xilinx_selectmap_driver = {
> + .driver = {
> + .name = "xilinx-selectmap",
> + .of_match_table = xlnx_selectmap_of_match,
> + },
> + .probe = xilinx_selectmap_probe,
> +};
> +
> +module_platform_driver(xilinx_selectmap_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Charles Perry <charles.perry@...oirfairelinux.com>");
> +MODULE_DESCRIPTION("Load Xilinx FPGA firmware over SelectMap");
> --
> 2.43.0
>
>
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