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Ip=[149.199.80.198]; Helo=[xir-pvapexch02.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN1PR02MB152 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190427_150527_096077_A9B697DE X-CRM114-Status: GOOD ( 19.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dragan Cvetic , Derek Kiernan , linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Implements an platform driver that matches with xlnx, sd-fec-1.1 device tree node and registers as a character device, including: - SD-FEC driver binds to sdfec DT node. - creates and initialise an initial driver dev structure. - add the driver in Linux build and Kconfig. Tested-by: Dragan Cvetic Signed-off-by: Derek Kiernan Signed-off-by: Dragan Cvetic --- drivers/misc/Kconfig | 12 +++ drivers/misc/Makefile | 1 + drivers/misc/xilinx_sdfec.c | 215 +++++++++++++++++++++++++++++++++++++++ include/uapi/misc/xilinx_sdfec.h | 42 ++++++++ 4 files changed, 270 insertions(+) create mode 100644 drivers/misc/xilinx_sdfec.c create mode 100644 include/uapi/misc/xilinx_sdfec.h diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 3209ee0..1a1fe9c 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -528,6 +528,18 @@ config PCI_ENDPOINT_TEST Enable this configuration option to enable the host side test driver for PCI Endpoint. +config XILINX_SDFEC + tristate "Xilinx SDFEC 16" + help + This option enables support for the Xilinx SDFEC (Soft Decision + Forward Error Correction) driver. This enables a char driver + for the SDFEC. + + You may select this driver if your design instantiates the + SDFEC(16nm) hardened block. To compile this as a module choose M. + + If unsure, say N. + config MISC_RTSX tristate default MISC_RTSX_PCI || MISC_RTSX_USB diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index c362395..ee31140c 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -49,6 +49,7 @@ obj-$(CONFIG_VMWARE_VMCI) += vmw_vmci/ obj-$(CONFIG_LATTICE_ECP3_CONFIG) += lattice-ecp3-config.o obj-$(CONFIG_SRAM) += sram.o obj-$(CONFIG_SRAM_EXEC) += sram-exec.o +obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o obj-y += mic/ obj-$(CONFIG_GENWQE) += genwqe/ obj-$(CONFIG_ECHO) += echo/ diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c new file mode 100644 index 0000000..278754b --- /dev/null +++ b/drivers/misc/xilinx_sdfec.c @@ -0,0 +1,215 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Xilinx SDFEC + * + * Copyright (C) 2016 - 2017 Xilinx, Inc. + * + * Description: + * This driver is developed for SDFEC16 (Soft Decision FEC 16nm) + * IP. It exposes a char device interface in sysfs and supports file + * operations like open(), close() and ioctl(). + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define DRIVER_NAME "xilinx_sdfec" +#define DRIVER_VERSION "0.3" +#define DRIVER_MAX_DEV BIT(MINORBITS) + +static struct class *xsdfec_class; +static atomic_t xsdfec_ndevs = ATOMIC_INIT(0); +static dev_t xsdfec_devt; + +/** + * struct xsdfec_dev - Driver data for SDFEC + * @regs: device physical base address + * @dev: pointer to device struct + * @config: Configuration of the SDFEC device + * @open_count: Count of char device being opened + * @xsdfec_cdev: Character device handle + * @irq_lock: Driver spinlock + * + * This structure contains necessary state for SDFEC driver to operate + */ +struct xsdfec_dev { + void __iomem *regs; + struct device *dev; + struct xsdfec_config config; + atomic_t open_count; + struct cdev xsdfec_cdev; + /* Spinlock to protect state_updated and stats_updated */ + spinlock_t irq_lock; +}; + +static const struct file_operations xsdfec_fops = { + .owner = THIS_MODULE, +}; + +static int xsdfec_probe(struct platform_device *pdev) +{ + struct xsdfec_dev *xsdfec; + struct device *dev; + struct device *dev_create; + struct resource *res; + int err; + + xsdfec = devm_kzalloc(&pdev->dev, sizeof(*xsdfec), GFP_KERNEL); + if (!xsdfec) + return -ENOMEM; + + xsdfec->dev = &pdev->dev; + xsdfec->config.fec_id = atomic_read(&xsdfec_ndevs); + spin_lock_init(&xsdfec->irq_lock); + + dev = xsdfec->dev; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + xsdfec->regs = devm_ioremap_resource(dev, res); + if (IS_ERR(xsdfec->regs)) { + dev_err(dev, "Unable to map resource"); + err = PTR_ERR(xsdfec->regs); + goto err_xsdfec_dev; + } + + /* Save driver private data */ + platform_set_drvdata(pdev, xsdfec); + + cdev_init(&xsdfec->xsdfec_cdev, &xsdfec_fops); + xsdfec->xsdfec_cdev.owner = THIS_MODULE; + err = cdev_add(&xsdfec->xsdfec_cdev, + MKDEV(MAJOR(xsdfec_devt), xsdfec->config.fec_id), 1); + if (err < 0) { + dev_err(dev, "cdev_add failed"); + err = -EIO; + goto err_xsdfec_dev; + } + + if (!xsdfec_class) { + err = -EIO; + dev_err(dev, "xsdfec class not created correctly"); + goto err_xsdfec_cdev; + } + + dev_create = + device_create(xsdfec_class, dev, + MKDEV(MAJOR(xsdfec_devt), xsdfec->config.fec_id), + xsdfec, "xsdfec%d", xsdfec->config.fec_id); + if (IS_ERR(dev_create)) { + dev_err(dev, "unable to create device"); + err = PTR_ERR(dev_create); + goto err_xsdfec_cdev; + } + + atomic_set(&xsdfec->open_count, 1); + dev_info(dev, "XSDFEC%d Probe Successful", xsdfec->config.fec_id); + atomic_inc(&xsdfec_ndevs); + return 0; + + /* Failure cleanup */ +err_xsdfec_cdev: + cdev_del(&xsdfec->xsdfec_cdev); +err_xsdfec_dev: + return err; +} + +static int xsdfec_remove(struct platform_device *pdev) +{ + struct xsdfec_dev *xsdfec; + struct device *dev = &pdev->dev; + + xsdfec = platform_get_drvdata(pdev); + if (!xsdfec) + return -ENODEV; + + if (!xsdfec_class) { + dev_err(dev, "xsdfec_class is NULL"); + return -EIO; + } + + device_destroy(xsdfec_class, + MKDEV(MAJOR(xsdfec_devt), xsdfec->config.fec_id)); + cdev_del(&xsdfec->xsdfec_cdev); + atomic_dec(&xsdfec_ndevs); + return 0; +} + +static const struct of_device_id xsdfec_of_match[] = { + { + .compatible = "xlnx,sd-fec-1.1", + }, + { /* end of table */ } +}; +MODULE_DEVICE_TABLE(of, xsdfec_of_match); + +static struct platform_driver xsdfec_driver = { + .driver = { + .name = "xilinx-sdfec", + .of_match_table = xsdfec_of_match, + }, + .probe = xsdfec_probe, + .remove = xsdfec_remove, +}; + +static int __init xsdfec_init_mod(void) +{ + int err; + + xsdfec_class = class_create(THIS_MODULE, DRIVER_NAME); + if (IS_ERR(xsdfec_class)) { + err = PTR_ERR(xsdfec_class); + pr_err("%s : Unable to register xsdfec class", __func__); + return err; + } + + err = alloc_chrdev_region(&xsdfec_devt, 0, DRIVER_MAX_DEV, DRIVER_NAME); + if (err < 0) { + pr_err("%s : Unable to get major number", __func__); + goto err_xsdfec_class; + } + + err = platform_driver_register(&xsdfec_driver); + if (err < 0) { + pr_err("%s Unabled to register %s driver", __func__, + DRIVER_NAME); + goto err_xsdfec_drv; + } + return 0; + + /* Error Path */ +err_xsdfec_drv: + unregister_chrdev_region(xsdfec_devt, DRIVER_MAX_DEV); +err_xsdfec_class: + class_destroy(xsdfec_class); + return err; +} + +static void __exit xsdfec_cleanup_mod(void) +{ + platform_driver_unregister(&xsdfec_driver); + unregister_chrdev_region(xsdfec_devt, DRIVER_MAX_DEV); + class_destroy(xsdfec_class); + xsdfec_class = NULL; +} + +module_init(xsdfec_init_mod); +module_exit(xsdfec_cleanup_mod); + +MODULE_AUTHOR("Xilinx, Inc"); +MODULE_DESCRIPTION("Xilinx SD-FEC16 Driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(DRIVER_VERSION); diff --git a/include/uapi/misc/xilinx_sdfec.h b/include/uapi/misc/xilinx_sdfec.h new file mode 100644 index 0000000..ba577fa --- /dev/null +++ b/include/uapi/misc/xilinx_sdfec.h @@ -0,0 +1,42 @@ +/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */ +/* + * Xilinx SD-FEC + * + * Copyright (C) 2016 - 2017 Xilinx, Inc. + * + * Description: + * This driver is developed for SDFEC16 IP. It provides a char device + * in sysfs and supports file operations like open(), close() and ioctl(). + */ +#ifndef __XILINX_SDFEC_H__ +#define __XILINX_SDFEC_H__ + +/** + * enum xsdfec_state - State. + * @XSDFEC_INIT: Driver is initialized. + * @XSDFEC_STARTED: Driver is started. + * @XSDFEC_STOPPED: Driver is stopped. + * @XSDFEC_NEEDS_RESET: Driver needs to be reset. + * @XSDFEC_PL_RECONFIGURE: Programmable Logic needs to be recofigured. + * + * This enum is used to indicate the state of the driver. + */ +enum xsdfec_state { + XSDFEC_INIT = 0, + XSDFEC_STARTED, + XSDFEC_STOPPED, + XSDFEC_NEEDS_RESET, + XSDFEC_PL_RECONFIGURE, +}; + +/** + * struct xsdfec_config - Configuration of SD-FEC core. + * @fec_id: ID of SD-FEC instance. ID is limited to the number of active + * SD-FEC's in the FPGA and is related to the driver instance + * Minor number. + */ +struct xsdfec_config { + __s32 fec_id; +}; + +#endif /* __XILINX_SDFEC_H__ */ -- 2.7.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel