[RESEND,2/2] misc: add support for retimers interfaces on Intel MAX 10 BMC

Message ID	1609999628-12748-3-git-send-email-yilun.xu@intel.com (mailing list archive)
State	Changes Requested
Delegated to:	Netdev Maintainers
Headers	show Return-Path: <netdev-owner@kernel.org> IronPort-SDR: Nxkm9Y0hO2/lXiQ5XhMZGAkw9AEEji77N5LxP9MYebnZR/AGrNo4vN6pMGHpsqbutMYUCyy4JM s0aojrMPrfew== IronPort-SDR: POBB5oXbFfiIDu+Ox1g3MnP5oij++mF4hMEzDmU5CMCASIAm0qJ1dT8W7or+hqr8jnLLOf52T5 0j5h8HSF2hgA== From: Xu Yilun <yilun.xu@intel.com> To: andrew@lunn.ch, arnd@arndb.de, lee.jones@linaro.org, gregkh@linuxfoundation.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, trix@redhat.com, lgoncalv@redhat.com, yilun.xu@intel.com, hao.wu@intel.com, matthew.gerlach@intel.com, russell.h.weight@intel.com Subject: [RESEND PATCH 2/2] misc: add support for retimers interfaces on Intel MAX 10 BMC Date: Thu, 7 Jan 2021 14:07:08 +0800 Message-Id: <1609999628-12748-3-git-send-email-yilun.xu@intel.com> In-Reply-To: <1609999628-12748-1-git-send-email-yilun.xu@intel.com> References: <1609999628-12748-1-git-send-email-yilun.xu@intel.com> Precedence: bulk
Series	Add retimer interfaces support for Intel MAX 10 BMC \| expand [RESEND,0/2] Add retimer interfaces support for Intel MAX 10 BMC [RESEND,1/2] mfd: intel-m10-bmc: specify the retimer sub devices [RESEND,2/2] misc: add support for retimers interfaces on Intel MAX 10 BMC

Context	Check	Description
netdev/tree_selection	success	Not a local patch

diff --git a/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-retimer b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-retimer new file mode 100644 index 0000000..528712a --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-intel-m10-bmc-retimer @@ -0,0 +1,32 @@ +What: /sys/bus/platform/devices/n3000bmc-retimer.*.auto/tag +Date: Jan 2021 +KernelVersion: 5.12 +Contact: Xu Yilun <yilun.xu@intel.com> +Description: Read only. Returns the tag of the retimer chip. Now there are 2 + retimer chips on Intel PAC N3000, they are tagged as + 'retimer_A' and 'retimer_B'. + Format: "retimer_%c". + +What: /sys/bus/platform/devices/n3000bmc-retimer.*.auto/sbus_version +Date: Jan 2021 +KernelVersion: 5.12 +Contact: Xu Yilun <yilun.xu@intel.com> +Description: Read only. Returns the Transceiver bus firmware version of + the retimer chip. + Format: "0x%04x". + +What: /sys/bus/platform/devices/n3000bmc-retimer.*.auto/serdes_version +Date: Jan 2021 +KernelVersion: 5.12 +Contact: Xu Yilun <yilun.xu@intel.com> +Description: Read only. Returns the SERDES firmware version of the retimer + chip. + Format: "0x%04x". + +What: /sys/bus/platform/devices/n3000bmc-retimer.*.auto/link_statusX +Date: Jan 2021 +KernelVersion: 5.12 +Contact: Xu Yilun <yilun.xu@intel.com> +Description: Read only. Returns the status of each line side link. "1" for + link up, "0" for link down. + Format: "%u". diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index fafa8b0..7cb9433 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -466,6 +466,16 @@ config HISI_HIKEY_USB switching between the dual-role USB-C port and the USB-A host ports using only one USB controller. +config INTEL_M10_BMC_RETIMER + tristate "Intel(R) MAX 10 BMC ethernet retimer interface support" + depends on MFD_INTEL_M10_BMC + help + This driver supports the ethernet retimer (C827) on Intel(R) MAX 10 + BMC, which is used by Intel PAC N3000 FPGA based Smart NIC. + + To compile this driver as a module, choose M here: the module will + be called intel-m10-bmc-retimer. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index d23231e..67883cf 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -57,3 +57,4 @@ obj-$(CONFIG_HABANA_AI) += habanalabs/ obj-$(CONFIG_UACCE) += uacce/ obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o +obj-$(CONFIG_INTEL_M10_BMC_RETIMER) += intel-m10-bmc-retimer.o diff --git a/drivers/misc/intel-m10-bmc-retimer.c b/drivers/misc/intel-m10-bmc-retimer.c new file mode 100644 index 0000000..d845342b --- /dev/null +++ b/drivers/misc/intel-m10-bmc-retimer.c @@ -0,0 +1,158 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Intel Max10 BMC Retimer Interface Driver + * + * Copyright (C) 2021 Intel Corporation, Inc. + * + */ +#include <linux/bitfield.h> +#include <linux/device.h> +#include <linux/mfd/intel-m10-bmc.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +#define N3000BMC_RETIMER_DEV_NAME "n3000bmc-retimer" + +struct m10bmc_retimer { + struct device *dev; + struct intel_m10bmc *m10bmc; + u32 ver_reg; + u32 id; +}; + +static ssize_t tag_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct m10bmc_retimer *retimer = dev_get_drvdata(dev); + + return sysfs_emit(buf, "retimer_%c\n", 'A' + retimer->id); +} +static DEVICE_ATTR_RO(tag); + +static ssize_t sbus_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct m10bmc_retimer *retimer = dev_get_drvdata(dev); + unsigned int val; + int ret; + + ret = m10bmc_sys_read(retimer->m10bmc, retimer->ver_reg, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "0x%04x\n", + (u16)FIELD_GET(M10BMC_PKVL_SBUS_VER, val)); +} +static DEVICE_ATTR_RO(sbus_version); + +static ssize_t serdes_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct m10bmc_retimer *retimer = dev_get_drvdata(dev); + unsigned int val; + int ret; + + ret = m10bmc_sys_read(retimer->m10bmc, retimer->ver_reg, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "0x%04x\n", + (u16)FIELD_GET(M10BMC_PKVL_SERDES_VER, val)); +} +static DEVICE_ATTR_RO(serdes_version); + +struct link_attr { + struct device_attribute attr; + u32 index; +}; + +#define to_link_attr(dev_attr) \ + container_of(dev_attr, struct link_attr, attr) + +static ssize_t +link_status_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct m10bmc_retimer *retimer = dev_get_drvdata(dev); + struct link_attr *lattr = to_link_attr(attr); + unsigned int val; + int ret; + + ret = m10bmc_sys_read(retimer->m10bmc, M10BMC_PKVL_LSTATUS, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", + !!(val & BIT((retimer->id << 2) + lattr->index))); +} + +#define link_status_attr(_index) \ + static struct link_attr link_attr_status##_index = \ + { .attr = __ATTR(link_status##_index, 0444, \ + link_status_show, NULL), \ + .index = (_index) } + +link_status_attr(0); +link_status_attr(1); +link_status_attr(2); +link_status_attr(3); + +static struct attribute *m10bmc_retimer_attrs[] = { + &dev_attr_tag.attr, + &dev_attr_sbus_version.attr, + &dev_attr_serdes_version.attr, + &link_attr_status0.attr.attr, + &link_attr_status1.attr.attr, + &link_attr_status2.attr.attr, + &link_attr_status3.attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(m10bmc_retimer); + +static int intel_m10bmc_retimer_probe(struct platform_device *pdev) +{ + struct intel_m10bmc *m10bmc = dev_get_drvdata(pdev->dev.parent); + struct m10bmc_retimer *retimer; + struct resource *res; + + retimer = devm_kzalloc(&pdev->dev, sizeof(*retimer), GFP_KERNEL); + if (!retimer) + return -ENOMEM; + + res = platform_get_resource_byname(pdev, IORESOURCE_REG, "version"); + if (!res) { + dev_err(&pdev->dev, "No REG resource for version\n"); + return -EINVAL; + } + + /* find the id of the retimer via the addr of the version register */ + if (res->start == M10BMC_PKVL_A_VER) { + retimer->id = 0; + } else if (res->start == M10BMC_PKVL_B_VER) { + retimer->id = 1; + } else { + dev_err(&pdev->dev, "version REG resource invalid\n"); + return -EINVAL; + } + + retimer->ver_reg = res->start; + retimer->dev = &pdev->dev; + retimer->m10bmc = m10bmc; + + dev_set_drvdata(&pdev->dev, retimer); + + return 0; +} + +static struct platform_driver intel_m10bmc_retimer_driver = { + .probe = intel_m10bmc_retimer_probe, + .driver = { + .name = N3000BMC_RETIMER_DEV_NAME, + .dev_groups = m10bmc_retimer_groups, + }, +}; +module_platform_driver(intel_m10bmc_retimer_driver); + +MODULE_ALIAS("platform:" N3000BMC_RETIMER_DEV_NAME); +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel MAX 10 BMC retimer driver"); +MODULE_LICENSE("GPL");

[RESEND,2/2] misc: add support for retimers interfaces on Intel MAX 10 BMC

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