From patchwork Tue Nov 14 16:11:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksandr Shamray X-Patchwork-Id: 837945 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybtyp2g9lz9rxm for ; Wed, 15 Nov 2017 03:59:30 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtyp1QltzDqXk for ; Wed, 15 Nov 2017 03:59:30 +1100 (AEDT) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=mellanox.com (client-ip=193.47.165.129; helo=mellanox.co.il; envelope-from=oleksandrs@mellanox.com; receiver=) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtvH0vfFzDqBr for ; Wed, 15 Nov 2017 03:56:25 +1100 (AEDT) Received: from Internal Mail-Server by MTLPINE1 (envelope-from oleksandrs@mellanox.com) with ESMTPS (AES256-SHA encrypted); 14 Nov 2017 18:11:08 +0200 Received: from r-vnc16.mtr.labs.mlnx (r-vnc16.mtr.labs.mlnx [10.208.0.16]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id vAEGB8m6031535; Tue, 14 Nov 2017 18:11:08 +0200 From: Oleksandr Shamray To: gregkh@linuxfoundation.org, arnd@arndb.de Subject: [patch v12 1/4] drivers: jtag: Add JTAG core driver Date: Tue, 14 Nov 2017 18:11:04 +0200 Message-Id: <1510675867-24276-2-git-send-email-oleksandrs@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> References: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: system-sw-low-level@mellanox.com, devicetree@vger.kernel.org, jiri@resnulli.us, vadimp@mellanox.com, linux-api@vger.kernel.org, openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, openocd-devel-owner@lists.sourceforge.net, mec@shout.net, Jiri Pirko , robh+dt@kernel.org, linux-serial@vger.kernel.org, Oleksandr Shamray , tklauser@distanz.ch, mchehab@kernel.org, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" Initial patch for JTAG driver JTAG class driver provide infrastructure to support hardware/software JTAG platform drivers. It provide user layer API interface for flashing and debugging external devices which equipped with JTAG interface using standard transactions. Driver exposes set of IOCTL to user space for: - XFER: - SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan); - SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan); - RUNTEST (Forces the IEEE 1149.1 bus to a run state for a specified number of clocks). - SIOCFREQ/GIOCFREQ for setting and reading JTAG frequency. Driver core provides set of internal APIs for allocation and registration: - jtag_register; - jtag_unregister; - jtag_alloc; - jtag_free; Platform driver on registration with jtag-core creates the next entry in dev folder: /dev/jtagX Signed-off-by: Oleksandr Shamray Signed-off-by: Jiri Pirko --- v11->v12 Comments pointed by Greg KH - Change jtag.h licence type to SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note and reorder line with license in description Chip Bilbrey - Remove Apeed reference from uapi jtag.h header - Remove access mode from xfer and idle transactions - Add new ioctl JTAG_SIOCMODE for set hw mode - Add only one open per JTAG port blocking with mutex blocking v10->v11 Notifications from kbuild test robot - include types.h headeri to jtag.h - fix incompatible type of xfer callback - remove rdundant class defination - Fix return order in case of xfer error V9->v10 Comments pointed by Greg KH - remove unnecessary alignment for pirv data - move jtag_copy_to_user and jtag_copy_from_user code just to ioctl - move int jtag_run_test_idle_op and jtag_xfer_op code just to ioctl - change return error codes to more applicable - add missing error checks - fix error check order in ioctl - remove unnecessary blank lines - add param validation to ioctl - remove compat_ioctl - remove only one open per JTAG port blocking. User will care about this. - Fix idr memory leak on jtag_exit - change cdev device type to misc V8->v9 Comments pointed by Arnd Bergmann - use get_user() instead of __get_user(). - change jtag->open type from int to atomic_t - remove spinlock on jtg_open - remove mutex on jtag_register - add unregister_chrdev_region on jtag_init err - add unregister_chrdev_region on jtag_exit - remove unnecessary pointer casts - add *data parameter to xfer function prototype v7->v8 Comments pointed by Moritz Fischer - Fix misspelling s/friver/driver v6->v7 Notifications from kbuild test robot - Remove include asm/types.h from jtag.h - Add include to jtag.c v5->v6 v4->v5 v3->v4 Comments pointed by Arnd Bergmann - change transaction pointer tdio type to __u64 - change internal status type from enum to __u32 - reorder jtag_xfer members to avoid the implied padding - add __packed attribute to jtag_xfer and jtag_run_test_idle v2->v3 Notifications from kbuild test robot - Change include path to in jtag.h v1->v2 Comments pointed by Greg KH - Change license type from GPLv2/BSD to GPLv2 - Change type of variables which crossed user/kernel to __type - Remove "default n" from Kconfig Comments pointed by Andrew Lunn - Change list_add_tail in jtag_unregister to list_del Comments pointed by Neil Armstrong - Add SPDX-License-Identifier instead of license text Comments pointed by Arnd Bergmann - Change __copy_to_user to memdup_user - Change __put_user to put_user - Change type of variables to __type for compatible 32 and 64-bit systems - Add check for maximum xfer data size - Change lookup data mechanism to get jtag data from inode - Add .compat_ioctl to file ops - Add mem alignment for jtag priv data Comments pointed by Tobias Klauser - Change function names to avoid match with variable types - Fix description for jtag_ru_test_idle in uapi jtag.h - Fix misprints IDEL/IDLE, trough/through --- Documentation/ioctl/ioctl-number.txt | 2 + MAINTAINERS | 10 ++ drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/jtag/Kconfig | 16 ++ drivers/jtag/Makefile | 1 + drivers/jtag/jtag.c | 292 ++++++++++++++++++++++++++++++++++ include/linux/jtag.h | 46 ++++++ include/uapi/linux/jtag.h | 105 ++++++++++++ 9 files changed, 475 insertions(+), 0 deletions(-) create mode 100644 drivers/jtag/Kconfig create mode 100644 drivers/jtag/Makefile create mode 100644 drivers/jtag/jtag.c create mode 100644 include/linux/jtag.h create mode 100644 include/uapi/linux/jtag.h diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt index 3e3fdae..1af2508 100644 --- a/Documentation/ioctl/ioctl-number.txt +++ b/Documentation/ioctl/ioctl-number.txt @@ -321,6 +321,8 @@ Code Seq#(hex) Include File Comments 0xB0 all RATIO devices in development: 0xB1 00-1F PPPoX +0xB2 00-0f linux/jtag.h JTAG driver + 0xB3 00 linux/mmc/ioctl.h 0xB4 00-0F linux/gpio.h 0xB5 00-0F uapi/linux/rpmsg.h diff --git a/MAINTAINERS b/MAINTAINERS index 205d397..dfcf49c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -7292,6 +7292,16 @@ L: linux-serial@vger.kernel.org S: Maintained F: drivers/tty/serial/jsm/ +JTAG SUBSYSTEM +M: Oleksandr Shamray +M: Vadim Pasternak +S: Maintained +F: include/linux/jtag.h +F: include/uapi/linux/jtag.h +F: drivers/jtag/ +F: Documentation/devicetree/bindings/jtag/ +F: Documentation/ABI/testing/jtag-cdev + K10TEMP HARDWARE MONITORING DRIVER M: Clemens Ladisch L: linux-hwmon@vger.kernel.org diff --git a/drivers/Kconfig b/drivers/Kconfig index 505c676..2214678 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -208,4 +208,6 @@ source "drivers/tee/Kconfig" source "drivers/mux/Kconfig" +source "drivers/jtag/Kconfig" + endmenu diff --git a/drivers/Makefile b/drivers/Makefile index dfdcda0..6a2059b 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -182,3 +182,4 @@ obj-$(CONFIG_FPGA) += fpga/ obj-$(CONFIG_FSI) += fsi/ obj-$(CONFIG_TEE) += tee/ obj-$(CONFIG_MULTIPLEXER) += mux/ +obj-$(CONFIG_JTAG) += jtag/ diff --git a/drivers/jtag/Kconfig b/drivers/jtag/Kconfig new file mode 100644 index 0000000..0fad1a3 --- /dev/null +++ b/drivers/jtag/Kconfig @@ -0,0 +1,16 @@ +menuconfig JTAG + tristate "JTAG support" + ---help--- + This provides basic core functionality support for jtag class devices + Hardware equipped with JTAG microcontroller which can be built + on top of this drivers. Driver exposes the set of IOCTL to the + user space for: + SIR (Scan Instruction Register, IEEE 1149.1 Data Register scan); + SDR (Scan Data Register, IEEE 1149.1 Instruction Register scan); + RUNTEST (Forces IEEE 1149.1 bus to a run state for specified + number of clocks). + + If you want this support, you should say Y here. + + To compile this driver as a module, choose M here: the module will + be called jtag. diff --git a/drivers/jtag/Makefile b/drivers/jtag/Makefile new file mode 100644 index 0000000..af37493 --- /dev/null +++ b/drivers/jtag/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_JTAG) += jtag.o diff --git a/drivers/jtag/jtag.c b/drivers/jtag/jtag.c new file mode 100644 index 0000000..fbeba84 --- /dev/null +++ b/drivers/jtag/jtag.c @@ -0,0 +1,292 @@ +/* + * drivers/jtag/jtag.c + * + * Copyright (c) 2017 Mellanox Technologies. All rights reserved. + * Copyright (c) 2017 Oleksandr Shamray + * + * Released under the GPLv2 only. + * SPDX-License-Identifier: GPL-2.0 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define JTAG_NAME "jtag0" +#define MAX_JTAG_NAME_LEN (sizeof("jtag") + 5) + +struct jtag { + struct miscdevice miscdev; + struct device *dev; + const struct jtag_ops *ops; + int id; + bool opened; + struct mutex open_lock; + unsigned long priv[0]; +}; + +static DEFINE_IDA(jtag_ida); + +void *jtag_priv(struct jtag *jtag) +{ + return jtag->priv; +} +EXPORT_SYMBOL_GPL(jtag_priv); + +static long jtag_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct jtag *jtag = file->private_data; + struct jtag_run_test_idle idle; + struct jtag_xfer xfer; + u8 *xfer_data; + u32 data_size; + u32 value; + int err; + + if (!arg) + return -EINVAL; + + switch (cmd) { + case JTAG_GIOCFREQ: + + if (jtag->ops->freq_get) + err = jtag->ops->freq_get(jtag, &value); + else + err = -EOPNOTSUPP; + if (err) + break; + + if (put_user(value, (__u32 *)arg)) + err = -EFAULT; + break; + + case JTAG_SIOCFREQ: + if (get_user(value, (__u32 *)arg)) + return -EFAULT; + if (value == 0) + return -EINVAL; + + if (jtag->ops->freq_set) + err = jtag->ops->freq_set(jtag, value); + else + err = -EOPNOTSUPP; + break; + + case JTAG_IOCRUNTEST: + if (copy_from_user(&idle, (void *)arg, + sizeof(struct jtag_run_test_idle))) + return -EFAULT; + + if (idle.endstate > JTAG_STATE_PAUSEDR) + return -EINVAL; + + if (jtag->ops->idle) + err = jtag->ops->idle(jtag, &idle); + else + err = -EOPNOTSUPP; + break; + + case JTAG_IOCXFER: + if (copy_from_user(&xfer, (void *)arg, + sizeof(struct jtag_xfer))) + return -EFAULT; + + if (xfer.length >= JTAG_MAX_XFER_DATA_LEN) + return -EINVAL; + + if (xfer.type > JTAG_SDR_XFER) + return -EINVAL; + + if (xfer.direction > JTAG_WRITE_XFER) + return -EINVAL; + + if (xfer.endstate > JTAG_STATE_PAUSEDR) + return -EINVAL; + + data_size = DIV_ROUND_UP(xfer.length, BITS_PER_BYTE); + xfer_data = memdup_user(u64_to_user_ptr(xfer.tdio), data_size); + + if (!xfer_data) + return -EFAULT; + + if (jtag->ops->xfer) { + err = jtag->ops->xfer(jtag, &xfer, xfer_data); + } else { + kfree(xfer_data); + return -EOPNOTSUPP; + } + + if (err) { + kfree(xfer_data); + return -EFAULT; + } + + err = copy_to_user(u64_to_user_ptr(xfer.tdio), + (void *)(xfer_data), data_size); + + if (err) { + kfree(xfer_data); + return -EFAULT; + } + + kfree(xfer_data); + if (copy_to_user((void *)arg, &xfer, sizeof(struct jtag_xfer))) + return -EFAULT; + break; + + case JTAG_GIOCSTATUS: + if (jtag->ops->status_get) + err = jtag->ops->status_get(jtag, &value); + else + err = -EOPNOTSUPP; + if (err) + break; + + err = put_user(value, (__u32 *)arg); + if (err) + err = -EFAULT; + break; + case JTAG_SIOCMODE: + if (get_user(value, (__u32 *)arg)) + return -EFAULT; + if (value == 0) + return -EINVAL; + + if (jtag->ops->mode_set) + err = jtag->ops->mode_set(jtag, value); + else + err = -EOPNOTSUPP; + break; + + default: + return -EINVAL; + } + return err; +} + +static int jtag_open(struct inode *inode, struct file *file) +{ + struct jtag *jtag = container_of(file->private_data, struct jtag, + miscdev); + + if (mutex_lock_interruptible(&jtag->open_lock)) + return -ERESTARTSYS; + + if (jtag->opened) { + mutex_unlock(&jtag->open_lock); + return -EINVAL; + } + + nonseekable_open(inode, file); + file->private_data = jtag; + jtag->opened = true; + mutex_unlock(&jtag->open_lock); + return 0; +} + +static int jtag_release(struct inode *inode, struct file *file) +{ + struct jtag *jtag = file->private_data; + + mutex_lock(&jtag->open_lock); + jtag->opened = false; + mutex_unlock(&jtag->open_lock); + return 0; +} + +static const struct file_operations jtag_fops = { + .owner = THIS_MODULE, + .open = jtag_open, + .release = jtag_release, + .llseek = noop_llseek, + .unlocked_ioctl = jtag_ioctl, +}; + +struct jtag *jtag_alloc(size_t priv_size, const struct jtag_ops *ops) +{ + struct jtag *jtag; + + jtag = kzalloc(sizeof(*jtag) + round_up(priv_size, ARCH_DMA_MINALIGN), + GFP_KERNEL); + if (!jtag) + return NULL; + + jtag->ops = ops; + return jtag; +} +EXPORT_SYMBOL_GPL(jtag_alloc); + +void jtag_free(struct jtag *jtag) +{ + kfree(jtag); +} +EXPORT_SYMBOL_GPL(jtag_free); + +int jtag_register(struct jtag *jtag) +{ + char *name; + int err; + int id; + + id = ida_simple_get(&jtag_ida, 0, 0, GFP_KERNEL); + if (id < 0) + return id; + + jtag->id = id; + + name = kzalloc(MAX_JTAG_NAME_LEN, GFP_KERNEL); + if (!name) { + err = -ENOMEM; + goto err_jtag_alloc; + } + + err = snprintf(name, MAX_JTAG_NAME_LEN, "jtag%d", id); + if (err < 0) + goto err_jtag_name; + + mutex_init(&jtag->open_lock); + jtag->miscdev.fops = &jtag_fops; + jtag->miscdev.minor = MISC_DYNAMIC_MINOR; + jtag->miscdev.name = name; + + err = misc_register(&jtag->miscdev); + if (err) + dev_err(jtag->dev, "Unable to register device\n"); + else + return 0; + jtag->opened = false; + +err_jtag_name: + kfree(name); +err_jtag_alloc: + ida_simple_remove(&jtag_ida, id); + return err; +} +EXPORT_SYMBOL_GPL(jtag_register); + +void jtag_unregister(struct jtag *jtag) +{ + misc_deregister(&jtag->miscdev); + kfree(jtag->miscdev.name); + ida_simple_remove(&jtag_ida, jtag->id); +} +EXPORT_SYMBOL_GPL(jtag_unregister); + +static void __exit jtag_exit(void) +{ + ida_destroy(&jtag_ida); +} + +module_exit(jtag_exit); + +MODULE_AUTHOR("Oleksandr Shamray "); +MODULE_DESCRIPTION("Generic jtag support"); +MODULE_LICENSE("GPL v2"); diff --git a/include/linux/jtag.h b/include/linux/jtag.h new file mode 100644 index 0000000..66b6389 --- /dev/null +++ b/include/linux/jtag.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 + * include/linux/jtag.h - JTAG class driver + * + * Copyright (c) 2017 Mellanox Technologies. All rights reserved. + * Copyright (c) 2017 Oleksandr Shamray + */ + +#ifndef __JTAG_H +#define __JTAG_H + +#include + +#ifndef ARCH_DMA_MINALIGN +#define ARCH_DMA_MINALIGN 1 +#endif + +#define jtag_u64_to_ptr(arg) ((void *)(uintptr_t)arg) + +#define JTAG_MAX_XFER_DATA_LEN 65535 + +struct jtag; +/** + * struct jtag_ops - callbacks for jtag control functions: + * + * @freq_get: get frequency function. Filled by device driver + * @freq_set: set frequency function. Filled by device driver + * @status_get: set status function. Filled by device driver + * @idle: set JTAG to idle state function. Filled by device driver + * @xfer: send JTAG xfer function. Filled by device driver + */ +struct jtag_ops { + int (*freq_get)(struct jtag *jtag, u32 *freq); + int (*freq_set)(struct jtag *jtag, u32 freq); + int (*status_get)(struct jtag *jtag, u32 *state); + int (*idle)(struct jtag *jtag, struct jtag_run_test_idle *idle); + int (*xfer)(struct jtag *jtag, struct jtag_xfer *xfer, u8 *xfer_data); + int (*mode_set)(struct jtag *jtag, u32 mode_mask); +}; + +void *jtag_priv(struct jtag *jtag); +int jtag_register(struct jtag *jtag); +void jtag_unregister(struct jtag *jtag); +struct jtag *jtag_alloc(size_t priv_size, const struct jtag_ops *ops); +void jtag_free(struct jtag *jtag); + +#endif /* __JTAG_H */ diff --git a/include/uapi/linux/jtag.h b/include/uapi/linux/jtag.h new file mode 100644 index 0000000..b6c4dde --- /dev/null +++ b/include/uapi/linux/jtag.h @@ -0,0 +1,105 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note + * include/uapi/linux/jtag.h - JTAG class driver uapi + * + * Copyright (c) 2017 Mellanox Technologies. All rights reserved. + * Copyright (c) 2017 Oleksandr Shamray + */ + +#ifndef __UAPI_LINUX_JTAG_H +#define __UAPI_LINUX_JTAG_H + +#include +/* + * JTAG_XFER_HW_MODE: JTAG hardware mode. Used to set HW drived or bitbang + * mode. This is bitmask param of ioctl JTAG_SIOCMODE command + */ +#define JTAG_XFER_HW_MODE 1 + +/** + * enum jtag_endstate: + * + * @JTAG_STATE_IDLE: JTAG state machine IDLE state + * @JTAG_STATE_PAUSEIR: JTAG state machine PAUSE_IR state + * @JTAG_STATE_PAUSEDR: JTAG state machine PAUSE_DR state + */ +enum jtag_endstate { + JTAG_STATE_IDLE, + JTAG_STATE_PAUSEIR, + JTAG_STATE_PAUSEDR, +}; + +/** + * enum jtag_xfer_type: + * + * @JTAG_SIR_XFER: SIR transfer + * @JTAG_SDR_XFER: SDR transfer + */ +enum jtag_xfer_type { + JTAG_SIR_XFER, + JTAG_SDR_XFER, +}; + +/** + * enum jtag_xfer_direction: + * + * @JTAG_READ_XFER: read transfer + * @JTAG_WRITE_XFER: write transfer + */ +enum jtag_xfer_direction { + JTAG_READ_XFER, + JTAG_WRITE_XFER, +}; + +/** + * struct jtag_run_test_idle - forces JTAG state machine to + * RUN_TEST/IDLE state + * + * @reset: 0 - run IDLE/PAUSE from current state + * 1 - go through TEST_LOGIC/RESET state before IDLE/PAUSE + * @end: completion flag + * @tck: clock counter + * + * Structure represents interface to JTAG device for jtag idle + * execution. + */ +struct jtag_run_test_idle { + __u8 reset; + __u8 endstate; + __u8 tck; +}; + +/** + * struct jtag_xfer - jtag xfer: + * + * @type: transfer type + * @direction: xfer direction + * @length: xfer bits len + * @tdio : xfer data array + * @endir: xfer end state + * + * Structure represents interface to JTAG device for jtag sdr xfer + * execution. + */ +struct jtag_xfer { + __u8 type; + __u8 direction; + __u8 endstate; + __u32 length; + __u64 tdio; +}; + +/* ioctl interface */ +#define __JTAG_IOCTL_MAGIC 0xb2 + +#define JTAG_IOCRUNTEST _IOW(__JTAG_IOCTL_MAGIC, 0,\ + struct jtag_run_test_idle) +#define JTAG_SIOCFREQ _IOW(__JTAG_IOCTL_MAGIC, 1, unsigned int) +#define JTAG_GIOCFREQ _IOR(__JTAG_IOCTL_MAGIC, 2, unsigned int) +#define JTAG_IOCXFER _IOWR(__JTAG_IOCTL_MAGIC, 3, struct jtag_xfer) +#define JTAG_GIOCSTATUS _IOWR(__JTAG_IOCTL_MAGIC, 4, enum jtag_endstate) +#define JTAG_SIOCMODE _IOW(__JTAG_IOCTL_MAGIC, 5, unsigned int) + +#define JTAG_FIRST_MINOR 0 +#define JTAG_MAX_DEVICES 32 + +#endif /* __UAPI_LINUX_JTAG_H */ From patchwork Tue Nov 14 16:11:05 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksandr Shamray X-Patchwork-Id: 837948 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybv0T0Kf0z9rxm for ; Wed, 15 Nov 2017 04:00:57 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybv0S670HzDqF3 for ; Wed, 15 Nov 2017 04:00:56 +1100 (AEDT) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=mellanox.com (client-ip=193.47.165.129; helo=mellanox.co.il; envelope-from=oleksandrs@mellanox.com; receiver=) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtvJ1wkfzDqDF for ; Wed, 15 Nov 2017 03:56:27 +1100 (AEDT) Received: from Internal Mail-Server by MTLPINE1 (envelope-from oleksandrs@mellanox.com) with ESMTPS (AES256-SHA encrypted); 14 Nov 2017 18:11:09 +0200 Received: from r-vnc16.mtr.labs.mlnx (r-vnc16.mtr.labs.mlnx [10.208.0.16]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id vAEGB8m7031535; Tue, 14 Nov 2017 18:11:08 +0200 From: Oleksandr Shamray To: gregkh@linuxfoundation.org, arnd@arndb.de Subject: [patch v12 2/4] drivers: jtag: Add Aspeed SoC 24xx and 25xx families JTAG master driver Date: Tue, 14 Nov 2017 18:11:05 +0200 Message-Id: <1510675867-24276-3-git-send-email-oleksandrs@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> References: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: system-sw-low-level@mellanox.com, devicetree@vger.kernel.org, jiri@resnulli.us, vadimp@mellanox.com, linux-api@vger.kernel.org, openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, openocd-devel-owner@lists.sourceforge.net, mec@shout.net, Jiri Pirko , robh+dt@kernel.org, linux-serial@vger.kernel.org, Oleksandr Shamray , tklauser@distanz.ch, mchehab@kernel.org, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" Driver adds support of Aspeed 2500/2400 series SOC JTAG master controller. Driver implements the following jtag ops: - freq_get; - freq_set; - status_get; - idle; - xfer; It has been tested on Mellanox system with BMC equipped with Aspeed 2520 SoC for programming CPLD devices. Signed-off-by: Oleksandr Shamray Signed-off-by: Jiri Pirko Acked-by: Arnd Bergmann --- v11->v12 Comments pointed by Chip Bilbrey - Remove access mode from xfer and idle transactions - Add new ioctl JTAG_SIOCMODE for set hw mode v10->v11 v9->v10 V8->v9 Comments pointed by Arnd Bergmann - add *data parameter to xfer function prototype v7->v8 Comments pointed by Joel Stanley - aspeed_jtag_init replace goto to return; - change input variables type from __u32 to u32 in functios freq_get, freq_set, status_get - change sm_ variables type from char to u8 - in jatg_init add disable clocks on error case - remove release_mem_region on error case - remove devm_free_irq on jtag_deinit - Fix misspelling Disabe/Disable - Change compatible string to ast2400 and ast2000 v6->v7 Notifications from kbuild test robot - Add include to jtag-asapeed.c v5->v6 v4->v5 Comments pointed by Arnd Bergmann - Added HAS_IOMEM dependence in Kconfig to avoid "undefined reference to `devm_ioremap_resource'" error, because in some arch this not supported v3->v4 Comments pointed by Arnd Bergmann - change transaction pointer tdio type to __u64 - change internal status type from enum to __u32 v2->v3 v1->v2 Comments pointed by Greg KH - change license type from GPLv2/BSD to GPLv2 Comments pointed by Neil Armstrong - Add clk_prepare_enable/clk_disable_unprepare in clock init/deinit - Change .compatible to soc-specific compatible names aspeed,aspeed4000-jtag/aspeed5000-jtag - Added dt-bindings Comments pointed by Arnd Bergmann - Reorder functions and removed the forward declarations - Add static const qualifier to state machine states transitions - Change .compatible to soc-specific compatible names aspeed,aspeed4000-jtag/aspeed5000-jtag - Add dt-bindings Comments pointed by Randy Dunlap - Change module name jtag-aspeed in description in Kconfig Comments pointed by kbuild test robot - Remove invalid include - add resource_size instead of calculation --- drivers/jtag/Kconfig | 13 + drivers/jtag/Makefile | 1 + drivers/jtag/jtag-aspeed.c | 782 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 796 insertions(+), 0 deletions(-) create mode 100644 drivers/jtag/jtag-aspeed.c diff --git a/drivers/jtag/Kconfig b/drivers/jtag/Kconfig index 0fad1a3..098beb0 100644 --- a/drivers/jtag/Kconfig +++ b/drivers/jtag/Kconfig @@ -14,3 +14,16 @@ menuconfig JTAG To compile this driver as a module, choose M here: the module will be called jtag. + +menuconfig JTAG_ASPEED + tristate "Aspeed SoC JTAG controller support" + depends on JTAG && HAS_IOMEM + ---help--- + This provides a support for Aspeed JTAG device, equipped on + Aspeed SoC 24xx and 25xx families. Drivers allows programming + of hardware devices, connected to SoC through the JTAG interface. + + If you want this support, you should say Y here. + + To compile this driver as a module, choose M here: the module will + be called jtag-aspeed. diff --git a/drivers/jtag/Makefile b/drivers/jtag/Makefile index af37493..04a855e 100644 --- a/drivers/jtag/Makefile +++ b/drivers/jtag/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_JTAG) += jtag.o +obj-$(CONFIG_JTAG_ASPEED) += jtag-aspeed.o diff --git a/drivers/jtag/jtag-aspeed.c b/drivers/jtag/jtag-aspeed.c new file mode 100644 index 0000000..a6e2417 --- /dev/null +++ b/drivers/jtag/jtag-aspeed.c @@ -0,0 +1,782 @@ +/* + * drivers/jtag/aspeed-jtag.c + * + * Copyright (c) 2017 Mellanox Technologies. All rights reserved. + * Copyright (c) 2017 Oleksandr Shamray + * + * Released under the GPLv2 only. + * SPDX-License-Identifier: GPL-2.0 + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ASPEED_JTAG_DATA 0x00 +#define ASPEED_JTAG_INST 0x04 +#define ASPEED_JTAG_CTRL 0x08 +#define ASPEED_JTAG_ISR 0x0C +#define ASPEED_JTAG_SW 0x10 +#define ASPEED_JTAG_TCK 0x14 +#define ASPEED_JTAG_EC 0x18 + +#define ASPEED_JTAG_DATA_MSB 0x01 +#define ASPEED_JTAG_DATA_CHUNK_SIZE 0x20 + +/* ASPEED_JTAG_CTRL: Engine Control */ +#define ASPEED_JTAG_CTL_ENG_EN BIT(31) +#define ASPEED_JTAG_CTL_ENG_OUT_EN BIT(30) +#define ASPEED_JTAG_CTL_FORCE_TMS BIT(29) +#define ASPEED_JTAG_CTL_INST_LEN(x) ((x) << 20) +#define ASPEED_JTAG_CTL_LASPEED_INST BIT(17) +#define ASPEED_JTAG_CTL_INST_EN BIT(16) +#define ASPEED_JTAG_CTL_DR_UPDATE BIT(10) +#define ASPEED_JTAG_CTL_DATA_LEN(x) ((x) << 4) +#define ASPEED_JTAG_CTL_LASPEED_DATA BIT(1) +#define ASPEED_JTAG_CTL_DATA_EN BIT(0) + +/* ASPEED_JTAG_ISR : Interrupt status and enable */ +#define ASPEED_JTAG_ISR_INST_PAUSE BIT(19) +#define ASPEED_JTAG_ISR_INST_COMPLETE BIT(18) +#define ASPEED_JTAG_ISR_DATA_PAUSE BIT(17) +#define ASPEED_JTAG_ISR_DATA_COMPLETE BIT(16) +#define ASPEED_JTAG_ISR_INST_PAUSE_EN BIT(3) +#define ASPEED_JTAG_ISR_INST_COMPLETE_EN BIT(2) +#define ASPEED_JTAG_ISR_DATA_PAUSE_EN BIT(1) +#define ASPEED_JTAG_ISR_DATA_COMPLETE_EN BIT(0) +#define ASPEED_JTAG_ISR_INT_EN_MASK GENMASK(3, 0) +#define ASPEED_JTAG_ISR_INT_MASK GENMASK(19, 16) + +/* ASPEED_JTAG_SW : Software Mode and Status */ +#define ASPEED_JTAG_SW_MODE_EN BIT(19) +#define ASPEED_JTAG_SW_MODE_TCK BIT(18) +#define ASPEED_JTAG_SW_MODE_TMS BIT(17) +#define ASPEED_JTAG_SW_MODE_TDIO BIT(16) + +/* ASPEED_JTAG_TCK : TCK Control */ +#define ASPEED_JTAG_TCK_DIVISOR_MASK GENMASK(10, 0) +#define ASPEED_JTAG_TCK_GET_DIV(x) ((x) & ASPEED_JTAG_TCK_DIVISOR_MASK) + +/* ASPEED_JTAG_EC : Controller set for go to IDLE */ +#define ASPEED_JTAG_EC_GO_IDLE BIT(0) + +#define ASPEED_JTAG_IOUT_LEN(len) (ASPEED_JTAG_CTL_ENG_EN |\ + ASPEED_JTAG_CTL_ENG_OUT_EN |\ + ASPEED_JTAG_CTL_INST_LEN(len)) + +#define ASPEED_JTAG_DOUT_LEN(len) (ASPEED_JTAG_CTL_ENG_EN |\ + ASPEED_JTAG_CTL_ENG_OUT_EN |\ + ASPEED_JTAG_CTL_DATA_LEN(len)) + +#define ASPEED_JTAG_TCK_WAIT 10 +#define ASPEED_JTAG_RESET_CNTR 10 + +#define ASPEED_JTAG_NAME "jtag-aspeed" + +struct aspeed_jtag { + void __iomem *reg_base; + struct device *dev; + struct clk *pclk; + enum jtag_endstate status; + int irq; + u32 flag; + wait_queue_head_t jtag_wq; + u32 mode; +}; + +static char *end_status_str[] = {"idle", "ir pause", "drpause"}; + +static u32 aspeed_jtag_read(struct aspeed_jtag *aspeed_jtag, u32 reg) +{ + return readl(aspeed_jtag->reg_base + reg); +} + +static void +aspeed_jtag_write(struct aspeed_jtag *aspeed_jtag, u32 val, u32 reg) +{ + writel(val, aspeed_jtag->reg_base + reg); +} + +static int aspeed_jtag_freq_set(struct jtag *jtag, u32 freq) +{ + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag); + unsigned long apb_frq; + u32 tck_val; + u16 div; + + apb_frq = clk_get_rate(aspeed_jtag->pclk); + div = (apb_frq % freq == 0) ? (apb_frq / freq) - 1 : (apb_frq / freq); + tck_val = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_TCK); + aspeed_jtag_write(aspeed_jtag, + (tck_val & ASPEED_JTAG_TCK_DIVISOR_MASK) | div, + ASPEED_JTAG_TCK); + return 0; +} + +static int aspeed_jtag_freq_get(struct jtag *jtag, u32 *frq) +{ + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag); + u32 pclk; + u32 tck; + + pclk = clk_get_rate(aspeed_jtag->pclk); + tck = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_TCK); + *frq = pclk / (ASPEED_JTAG_TCK_GET_DIV(tck) + 1); + + return 0; +} + +static int aspeed_jtag_mode_set(struct jtag *jtag, u32 mode) +{ + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag); + + aspeed_jtag->mode = mode; + return 0; +} + +static void aspeed_jtag_sw_delay(struct aspeed_jtag *aspeed_jtag, int cnt) +{ + int i; + + for (i = 0; i < cnt; i++) + aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_SW); +} + +static char aspeed_jtag_tck_cycle(struct aspeed_jtag *aspeed_jtag, + u8 tms, u8 tdi) +{ + char tdo = 0; + + /* TCK = 0 */ + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + (tms * ASPEED_JTAG_SW_MODE_TMS) | + (tdi * ASPEED_JTAG_SW_MODE_TDIO), ASPEED_JTAG_SW); + + aspeed_jtag_sw_delay(aspeed_jtag, ASPEED_JTAG_TCK_WAIT); + + /* TCK = 1 */ + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + ASPEED_JTAG_SW_MODE_TCK | + (tms * ASPEED_JTAG_SW_MODE_TMS) | + (tdi * ASPEED_JTAG_SW_MODE_TDIO), ASPEED_JTAG_SW); + + if (aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_SW) & + ASPEED_JTAG_SW_MODE_TDIO) + tdo = 1; + + aspeed_jtag_sw_delay(aspeed_jtag, ASPEED_JTAG_TCK_WAIT); + + /* TCK = 0 */ + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + (tms * ASPEED_JTAG_SW_MODE_TMS) | + (tdi * ASPEED_JTAG_SW_MODE_TDIO), ASPEED_JTAG_SW); + return tdo; +} + +static void aspeed_jtag_wait_instruction_pause(struct aspeed_jtag *aspeed_jtag) +{ + wait_event_interruptible(aspeed_jtag->jtag_wq, aspeed_jtag->flag & + ASPEED_JTAG_ISR_INST_PAUSE); + aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_INST_PAUSE; +} + +static void +aspeed_jtag_wait_instruction_complete(struct aspeed_jtag *aspeed_jtag) +{ + wait_event_interruptible(aspeed_jtag->jtag_wq, aspeed_jtag->flag & + ASPEED_JTAG_ISR_INST_COMPLETE); + aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_INST_COMPLETE; +} + +static void +aspeed_jtag_wait_data_pause_complete(struct aspeed_jtag *aspeed_jtag) +{ + wait_event_interruptible(aspeed_jtag->jtag_wq, aspeed_jtag->flag & + ASPEED_JTAG_ISR_DATA_PAUSE); + aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_DATA_PAUSE; +} + +static void aspeed_jtag_wait_data_complete(struct aspeed_jtag *aspeed_jtag) +{ + wait_event_interruptible(aspeed_jtag->jtag_wq, aspeed_jtag->flag & + ASPEED_JTAG_ISR_DATA_COMPLETE); + aspeed_jtag->flag &= ~ASPEED_JTAG_ISR_DATA_COMPLETE; +} + +static void aspeed_jtag_sm_cycle(struct aspeed_jtag *aspeed_jtag, const u8 *tms, + int len) +{ + int i; + + for (i = 0; i < len; i++) + aspeed_jtag_tck_cycle(aspeed_jtag, tms[i], 0); +} + +static void aspeed_jtag_run_test_idle_sw(struct aspeed_jtag *aspeed_jtag, + struct jtag_run_test_idle *runtest) +{ + static const u8 sm_pause_irpause[] = {1, 1, 1, 1, 0, 1, 0}; + static const u8 sm_pause_drpause[] = {1, 1, 1, 0, 1, 0}; + static const u8 sm_idle_irpause[] = {1, 1, 0, 1, 0}; + static const u8 sm_idle_drpause[] = {1, 0, 1, 0}; + static const u8 sm_pause_idle[] = {1, 1, 0}; + int i; + + /* SW mode from idle/pause-> to pause/idle */ + if (runtest->reset) { + for (i = 0; i < ASPEED_JTAG_RESET_CNTR; i++) + aspeed_jtag_tck_cycle(aspeed_jtag, 1, 0); + } + + switch (aspeed_jtag->status) { + case JTAG_STATE_IDLE: + switch (runtest->endstate) { + case JTAG_STATE_PAUSEIR: + /* ->DRSCan->IRSCan->IRCap->IRExit1->PauseIR */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_idle_irpause, + sizeof(sm_idle_irpause)); + + aspeed_jtag->status = JTAG_STATE_PAUSEIR; + break; + case JTAG_STATE_PAUSEDR: + /* ->DRSCan->DRCap->DRExit1->PauseDR */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_idle_drpause, + sizeof(sm_idle_drpause)); + + aspeed_jtag->status = JTAG_STATE_PAUSEDR; + break; + case JTAG_STATE_IDLE: + /* IDLE */ + aspeed_jtag_tck_cycle(aspeed_jtag, 0, 0); + aspeed_jtag->status = JTAG_STATE_IDLE; + break; + default: + break; + } + break; + + case JTAG_STATE_PAUSEIR: + /* Fall-through */ + case JTAG_STATE_PAUSEDR: + /* From IR/DR Pause */ + switch (runtest->endstate) { + case JTAG_STATE_PAUSEIR: + /* + * to Exit2 IR/DR->Updt IR/DR->DRSCan->IRSCan->IRCap-> + * IRExit1->PauseIR + */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_irpause, + sizeof(sm_pause_irpause)); + + aspeed_jtag->status = JTAG_STATE_PAUSEIR; + break; + case JTAG_STATE_PAUSEDR: + /* + * to Exit2 IR/DR->Updt IR/DR->DRSCan->DRCap-> + * DRExit1->PauseDR + */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_drpause, + sizeof(sm_pause_drpause)); + aspeed_jtag->status = JTAG_STATE_PAUSEDR; + break; + case JTAG_STATE_IDLE: + /* to Exit2 IR/DR->Updt IR/DR->IDLE */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_idle, + sizeof(sm_pause_idle)); + aspeed_jtag->status = JTAG_STATE_IDLE; + break; + default: + break; + } + break; + + default: + dev_err(aspeed_jtag->dev, "aspeed_jtag_run_test_idle error\n"); + break; + } + + /* Stay on IDLE for at least TCK cycle */ + for (i = 0; i < runtest->tck; i++) + aspeed_jtag_tck_cycle(aspeed_jtag, 0, 0); +} + +/** + * aspeed_jtag_run_test_idle: + * JTAG reset: generates at least 9 TMS high and 1 TMS low to force + * devices into Run-Test/Idle State. + */ +static int aspeed_jtag_idle(struct jtag *jtag, + struct jtag_run_test_idle *runtest) +{ + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag); + + dev_dbg(aspeed_jtag->dev, "aspeed_jtag runtest, status:%d, mode:%s, state:%s, reset:%d, tck:%d\n", + aspeed_jtag->status, + aspeed_jtag->mode & JTAG_XFER_HW_MODE ? "HW" : "SW", + end_status_str[runtest->endstate], runtest->reset, + runtest->tck); + + if (!(aspeed_jtag->mode & JTAG_XFER_HW_MODE)) { + aspeed_jtag_run_test_idle_sw(aspeed_jtag, runtest); + return 0; + } + + /* Disable sw mode */ + aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_SW); + /* x TMS high + 1 TMS low */ + if (runtest->reset) + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_CTL_ENG_EN | + ASPEED_JTAG_CTL_ENG_OUT_EN | + ASPEED_JTAG_CTL_FORCE_TMS, ASPEED_JTAG_CTRL); + else + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_EC_GO_IDLE, + ASPEED_JTAG_EC); + + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + ASPEED_JTAG_SW_MODE_TDIO, ASPEED_JTAG_SW); + + aspeed_jtag->status = JTAG_STATE_IDLE; + return 0; +} + +static void aspeed_jtag_xfer_sw(struct aspeed_jtag *aspeed_jtag, + struct jtag_xfer *xfer, unsigned long *data) +{ + unsigned long remain_xfer = xfer->length; + unsigned long shift_bits = 0; + unsigned long index = 0; + unsigned long tdi; + char tdo; + + if (xfer->direction == JTAG_READ_XFER) + tdi = UINT_MAX; + else + tdi = data[index]; + + while (remain_xfer > 1) { + tdo = aspeed_jtag_tck_cycle(aspeed_jtag, 0, + tdi & ASPEED_JTAG_DATA_MSB); + data[index] |= tdo << (shift_bits % + ASPEED_JTAG_DATA_CHUNK_SIZE); + + tdi >>= 1; + shift_bits++; + remain_xfer--; + + if (shift_bits % ASPEED_JTAG_DATA_CHUNK_SIZE == 0) { + dev_dbg(aspeed_jtag->dev, "R/W data[%lu]:%lx\n", + index, data[index]); + + tdo = 0; + index++; + + if (xfer->direction == JTAG_READ_XFER) + tdi = UINT_MAX; + else + tdi = data[index]; + } + } + + tdo = aspeed_jtag_tck_cycle(aspeed_jtag, 1, tdi & ASPEED_JTAG_DATA_MSB); + data[index] |= tdo << (shift_bits % ASPEED_JTAG_DATA_CHUNK_SIZE); +} + +static void aspeed_jtag_xfer_push_data(struct aspeed_jtag *aspeed_jtag, + enum jtag_xfer_type type, u32 bits_len) +{ + dev_dbg(aspeed_jtag->dev, "shift bits %d\n", bits_len); + + if (type == JTAG_SIR_XFER) { + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_IOUT_LEN(bits_len), + ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_DOUT_LEN(bits_len) | + ASPEED_JTAG_CTL_INST_EN, ASPEED_JTAG_CTRL); + } else { + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_DOUT_LEN(bits_len), + ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_DOUT_LEN(bits_len) | + ASPEED_JTAG_CTL_DATA_EN, ASPEED_JTAG_CTRL); + } +} + +static void aspeed_jtag_xfer_push_data_last(struct aspeed_jtag *aspeed_jtag, + enum jtag_xfer_type type, + u32 shift_bits, + enum jtag_endstate endstate) +{ + if (endstate != JTAG_STATE_IDLE) { + if (type == JTAG_SIR_XFER) { + dev_dbg(aspeed_jtag->dev, "IR Keep Pause\n"); + + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_IOUT_LEN(shift_bits), + ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_IOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_INST_EN, + ASPEED_JTAG_CTRL); + aspeed_jtag_wait_instruction_pause(aspeed_jtag); + } else { + dev_dbg(aspeed_jtag->dev, "DR Keep Pause\n"); + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_DOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_DR_UPDATE, + ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_DOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_DR_UPDATE | + ASPEED_JTAG_CTL_DATA_EN, + ASPEED_JTAG_CTRL); + aspeed_jtag_wait_data_pause_complete(aspeed_jtag); + } + } else { + if (type == JTAG_SIR_XFER) { + dev_dbg(aspeed_jtag->dev, "IR go IDLE\n"); + + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_IOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_LASPEED_INST, + ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_IOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_LASPEED_INST | + ASPEED_JTAG_CTL_INST_EN, + ASPEED_JTAG_CTRL); + aspeed_jtag_wait_instruction_complete(aspeed_jtag); + } else { + dev_dbg(aspeed_jtag->dev, "DR go IDLE\n"); + + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_DOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_LASPEED_DATA, + ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, + ASPEED_JTAG_DOUT_LEN(shift_bits) | + ASPEED_JTAG_CTL_LASPEED_DATA | + ASPEED_JTAG_CTL_DATA_EN, + ASPEED_JTAG_CTRL); + aspeed_jtag_wait_data_complete(aspeed_jtag); + } + } +} + +static void aspeed_jtag_xfer_hw(struct aspeed_jtag *aspeed_jtag, + struct jtag_xfer *xfer, unsigned long *data) +{ + unsigned long remain_xfer = xfer->length; + unsigned long index = 0; + char shift_bits; + u32 data_reg; + + data_reg = xfer->type == JTAG_SIR_XFER ? + ASPEED_JTAG_INST : ASPEED_JTAG_DATA; + while (remain_xfer) { + if (xfer->direction == JTAG_WRITE_XFER) { + dev_dbg(aspeed_jtag->dev, "W dr->dr_data[%lu]:%lx\n", + index, data[index]); + + aspeed_jtag_write(aspeed_jtag, data[index], data_reg); + } else { + aspeed_jtag_write(aspeed_jtag, 0, data_reg); + } + + if (remain_xfer > ASPEED_JTAG_DATA_CHUNK_SIZE) { + shift_bits = ASPEED_JTAG_DATA_CHUNK_SIZE; + + /* + * Read bytes were not equals to column length + * and go to Pause-DR + */ + aspeed_jtag_xfer_push_data(aspeed_jtag, xfer->type, + shift_bits); + } else { + /* + * Read bytes equals to column length => + * Update-DR + */ + shift_bits = remain_xfer; + aspeed_jtag_xfer_push_data_last(aspeed_jtag, xfer->type, + shift_bits, + xfer->endstate); + } + + if (xfer->direction == JTAG_READ_XFER) { + if (shift_bits < ASPEED_JTAG_DATA_CHUNK_SIZE) { + data[index] = aspeed_jtag_read(aspeed_jtag, + data_reg); + + data[index] >>= ASPEED_JTAG_DATA_CHUNK_SIZE - + shift_bits; + } else { + data[index] = aspeed_jtag_read(aspeed_jtag, + data_reg); + } + dev_dbg(aspeed_jtag->dev, "R dr->dr_data[%lu]:%lx\n", + index, data[index]); + } + + remain_xfer = remain_xfer - shift_bits; + index++; + dev_dbg(aspeed_jtag->dev, "remain_xfer %lu\n", remain_xfer); + } +} + +static int aspeed_jtag_xfer(struct jtag *jtag, struct jtag_xfer *xfer, + u8 *xfer_data) +{ + static const u8 sm_update_shiftir[] = {1, 1, 0, 0}; + static const u8 sm_update_shiftdr[] = {1, 0, 0}; + static const u8 sm_pause_idle[] = {1, 1, 0}; + static const u8 sm_pause_update[] = {1, 1}; + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag); + unsigned long *data = (unsigned long *)xfer_data; + unsigned long remain_xfer = xfer->length; + unsigned long offset; + char dbg_str[256]; + int pos = 0; + int i; + + for (offset = 0, i = 0; offset < xfer->length; + offset += ASPEED_JTAG_DATA_CHUNK_SIZE, i++) { + pos += snprintf(&dbg_str[pos], sizeof(dbg_str) - pos, + "0x%08lx ", data[i]); + } + + dev_dbg(aspeed_jtag->dev, "aspeed_jtag %s %s xfer, mode:%s, END:%d, len:%lu, TDI[%s]\n", + xfer->type == JTAG_SIR_XFER ? "SIR" : "SDR", + xfer->direction == JTAG_READ_XFER ? "READ" : "WRITE", + aspeed_jtag->mode & JTAG_XFER_HW_MODE ? "HW" : "SW", + xfer->endstate, remain_xfer, dbg_str); + + if (!(aspeed_jtag->mode & JTAG_XFER_HW_MODE)) { + /* SW mode */ + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + ASPEED_JTAG_SW_MODE_TDIO, ASPEED_JTAG_SW); + + if (aspeed_jtag->status != JTAG_STATE_IDLE) { + /*IR/DR Pause->Exit2 IR / DR->Update IR /DR */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_update, + sizeof(sm_pause_update)); + } + + if (xfer->type == JTAG_SIR_XFER) + /* ->IRSCan->CapIR->ShiftIR */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_update_shiftir, + sizeof(sm_update_shiftir)); + else + /* ->DRScan->DRCap->DRShift */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_update_shiftdr, + sizeof(sm_update_shiftdr)); + + aspeed_jtag_xfer_sw(aspeed_jtag, xfer, data); + + /* DIPause/DRPause */ + aspeed_jtag_tck_cycle(aspeed_jtag, 0, 0); + + if (xfer->endstate == JTAG_STATE_IDLE) { + /* ->DRExit2->DRUpdate->IDLE */ + aspeed_jtag_sm_cycle(aspeed_jtag, sm_pause_idle, + sizeof(sm_pause_idle)); + } + } else { + /* hw mode */ + aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_SW); + aspeed_jtag_xfer_hw(aspeed_jtag, xfer, data); + } + + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + ASPEED_JTAG_SW_MODE_TDIO, ASPEED_JTAG_SW); + aspeed_jtag->status = xfer->endstate; + return 0; +} + +static int aspeed_jtag_status_get(struct jtag *jtag, u32 *status) +{ + struct aspeed_jtag *aspeed_jtag = jtag_priv(jtag); + + *status = aspeed_jtag->status; + return 0; +} + +static irqreturn_t aspeed_jtag_interrupt(s32 this_irq, void *dev_id) +{ + struct aspeed_jtag *aspeed_jtag = dev_id; + irqreturn_t ret; + u32 status; + + status = aspeed_jtag_read(aspeed_jtag, ASPEED_JTAG_ISR); + dev_dbg(aspeed_jtag->dev, "status %x\n", status); + + if (status & ASPEED_JTAG_ISR_INT_MASK) { + aspeed_jtag_write(aspeed_jtag, + (status & ASPEED_JTAG_ISR_INT_MASK) + | (status & ASPEED_JTAG_ISR_INT_EN_MASK), + ASPEED_JTAG_ISR); + aspeed_jtag->flag |= status & ASPEED_JTAG_ISR_INT_MASK; + } + + if (aspeed_jtag->flag) { + wake_up_interruptible(&aspeed_jtag->jtag_wq); + ret = IRQ_HANDLED; + } else { + dev_err(aspeed_jtag->dev, "aspeed_jtag irq status:%x\n", + status); + ret = IRQ_NONE; + } + return ret; +} + +int aspeed_jtag_init(struct platform_device *pdev, + struct aspeed_jtag *aspeed_jtag) +{ + struct resource *res; + int err; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + aspeed_jtag->reg_base = devm_ioremap_resource(aspeed_jtag->dev, res); + if (IS_ERR(aspeed_jtag->reg_base)) + return -ENOMEM; + + aspeed_jtag->pclk = devm_clk_get(aspeed_jtag->dev, NULL); + if (IS_ERR(aspeed_jtag->pclk)) { + dev_err(aspeed_jtag->dev, "devm_clk_get failed\n"); + return PTR_ERR(aspeed_jtag->pclk); + } + + clk_prepare_enable(aspeed_jtag->pclk); + + aspeed_jtag->irq = platform_get_irq(pdev, 0); + if (aspeed_jtag->irq < 0) { + dev_err(aspeed_jtag->dev, "no irq specified\n"); + err = -ENOENT; + goto clk_unprep; + } + + /* Enable clock */ + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_CTL_ENG_EN | + ASPEED_JTAG_CTL_ENG_OUT_EN, ASPEED_JTAG_CTRL); + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_SW_MODE_EN | + ASPEED_JTAG_SW_MODE_TDIO, ASPEED_JTAG_SW); + + err = devm_request_irq(aspeed_jtag->dev, aspeed_jtag->irq, + aspeed_jtag_interrupt, 0, + "aspeed-jtag", aspeed_jtag); + if (err) { + dev_err(aspeed_jtag->dev, "aspeed_jtag unable to get IRQ"); + goto clk_unprep; + } + dev_dbg(&pdev->dev, "aspeed_jtag:IRQ %d.\n", aspeed_jtag->irq); + + aspeed_jtag_write(aspeed_jtag, ASPEED_JTAG_ISR_INST_PAUSE | + ASPEED_JTAG_ISR_INST_COMPLETE | + ASPEED_JTAG_ISR_DATA_PAUSE | + ASPEED_JTAG_ISR_DATA_COMPLETE | + ASPEED_JTAG_ISR_INST_PAUSE_EN | + ASPEED_JTAG_ISR_INST_COMPLETE_EN | + ASPEED_JTAG_ISR_DATA_PAUSE_EN | + ASPEED_JTAG_ISR_DATA_COMPLETE_EN, + ASPEED_JTAG_ISR); + + aspeed_jtag->flag = 0; + aspeed_jtag->mode = 0; + init_waitqueue_head(&aspeed_jtag->jtag_wq); + return 0; + +clk_unprep: + clk_disable_unprepare(aspeed_jtag->pclk); + return err; +} + +int aspeed_jtag_deinit(struct platform_device *pdev, + struct aspeed_jtag *aspeed_jtag) +{ + aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_ISR); + /* Disable clock */ + aspeed_jtag_write(aspeed_jtag, 0, ASPEED_JTAG_CTRL); + clk_disable_unprepare(aspeed_jtag->pclk); + return 0; +} + +static const struct jtag_ops aspeed_jtag_ops = { + .freq_get = aspeed_jtag_freq_get, + .freq_set = aspeed_jtag_freq_set, + .status_get = aspeed_jtag_status_get, + .idle = aspeed_jtag_idle, + .xfer = aspeed_jtag_xfer, + .mode_set = aspeed_jtag_mode_set +}; + +static int aspeed_jtag_probe(struct platform_device *pdev) +{ + struct aspeed_jtag *aspeed_jtag; + struct jtag *jtag; + int err; + + if (!of_device_is_compatible(pdev->dev.of_node, "aspeed,aspeed-jtag")) + return -ENOMEM; + + jtag = jtag_alloc(sizeof(*aspeed_jtag), &aspeed_jtag_ops); + if (!jtag) + return -ENODEV; + + platform_set_drvdata(pdev, jtag); + aspeed_jtag = jtag_priv(jtag); + aspeed_jtag->dev = &pdev->dev; + + /* Initialize device*/ + err = aspeed_jtag_init(pdev, aspeed_jtag); + if (err) + goto err_jtag_init; + + /* Initialize JTAG core structure*/ + err = jtag_register(jtag); + if (err) + goto err_jtag_register; + + return 0; + +err_jtag_register: + aspeed_jtag_deinit(pdev, aspeed_jtag); +err_jtag_init: + jtag_free(jtag); + return err; +} + +static int aspeed_jtag_remove(struct platform_device *pdev) +{ + struct jtag *jtag; + + jtag = platform_get_drvdata(pdev); + aspeed_jtag_deinit(pdev, jtag_priv(jtag)); + jtag_unregister(jtag); + jtag_free(jtag); + return 0; +} + +static const struct of_device_id aspeed_jtag_of_match[] = { + { .compatible = "aspeed,ast2400-jtag", }, + { .compatible = "aspeed,ast2500-jtag", }, + {} +}; + +static struct platform_driver aspeed_jtag_driver = { + .probe = aspeed_jtag_probe, + .remove = aspeed_jtag_remove, + .driver = { + .name = ASPEED_JTAG_NAME, + .of_match_table = aspeed_jtag_of_match, + }, +}; +module_platform_driver(aspeed_jtag_driver); + +MODULE_AUTHOR("Oleksandr Shamray "); +MODULE_DESCRIPTION("ASPEED JTAG driver"); +MODULE_LICENSE("GPL v2"); From patchwork Tue Nov 14 16:11:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksandr Shamray X-Patchwork-Id: 837946 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybtzC1Cb5z9rxm for ; Wed, 15 Nov 2017 03:59:51 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtzC0F17zDqDF for ; Wed, 15 Nov 2017 03:59:51 +1100 (AEDT) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=mellanox.com (client-ip=193.47.165.129; helo=mellanox.co.il; envelope-from=oleksandrs@mellanox.com; receiver=) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtvK4dR7zDqF3 for ; Wed, 15 Nov 2017 03:56:28 +1100 (AEDT) Received: from Internal Mail-Server by MTLPINE1 (envelope-from oleksandrs@mellanox.com) with ESMTPS (AES256-SHA encrypted); 14 Nov 2017 18:11:09 +0200 Received: from r-vnc16.mtr.labs.mlnx (r-vnc16.mtr.labs.mlnx [10.208.0.16]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id vAEGB8m8031535; Tue, 14 Nov 2017 18:11:09 +0200 From: Oleksandr Shamray To: gregkh@linuxfoundation.org, arnd@arndb.de Subject: [patch v12 3/4] Documentation: jtag: Add bindings for Aspeed SoC 24xx and 25xx families JTAG master driver Date: Tue, 14 Nov 2017 18:11:06 +0200 Message-Id: <1510675867-24276-4-git-send-email-oleksandrs@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> References: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: system-sw-low-level@mellanox.com, devicetree@vger.kernel.org, jiri@resnulli.us, vadimp@mellanox.com, linux-api@vger.kernel.org, openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, openocd-devel-owner@lists.sourceforge.net, mec@shout.net, Jiri Pirko , robh+dt@kernel.org, linux-serial@vger.kernel.org, Oleksandr Shamray , tklauser@distanz.ch, mchehab@kernel.org, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" It has been tested on Mellanox system with BMC equipped with Aspeed 2520 SoC for programming CPLD devices. Signed-off-by: Oleksandr Shamray Signed-off-by: Jiri Pirko Acked-by: Rob Herring --- v11->v12 v10->v11 v9->v10 v8->v9 v7->v8 Comments pointed by pointed by Joel Stanley - Change compatible string to ast2400 and ast2000 V6->v7 Comments pointed by Tobias Klauser - Fix spell "Doccumentation" -> "Documentation" v5->v6 Comments pointed by Tobias Klauser - Small nit: s/documentation/Documentation/ v4->v5 V3->v4 Comments pointed by Rob Herring - delete unnecessary "status" and "reg-shift" descriptions in bndings file v2->v3 Comments pointed by Rob Herring - split Aspeed jtag driver and binding to sepatrate patches - delete unnecessary "status" and "reg-shift" descriptions in bndings file --- .../devicetree/bindings/jtag/aspeed-jtag.txt | 18 ++++++++++++++++++ 1 files changed, 18 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/jtag/aspeed-jtag.txt diff --git a/Documentation/devicetree/bindings/jtag/aspeed-jtag.txt b/Documentation/devicetree/bindings/jtag/aspeed-jtag.txt new file mode 100644 index 0000000..8cfc610 --- /dev/null +++ b/Documentation/devicetree/bindings/jtag/aspeed-jtag.txt @@ -0,0 +1,18 @@ +Aspeed JTAG driver for ast2400 and ast2500 SoC + +Required properties: +- compatible: Should be one of + - "aspeed,ast2400-jtag" + - "aspeed,ast2500-jtag" +- reg contains the offset and length of the JTAG memory + region +- clocks root clock of bus, should reference the APB clock +- interrupts should contain JTAG controller interrupt + +Example: +jtag: jtag@1e6e4000 { + compatible = "aspeed,ast2500-jtag"; + reg = <0x1e6e4000 0x1c>; + clocks = <&clk_apb>; + interrupts = <43>; +}; From patchwork Tue Nov 14 16:11:07 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oleksandr Shamray X-Patchwork-Id: 837947 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3ybtzp66Tbz9rxm for ; Wed, 15 Nov 2017 04:00:22 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtzp4p4zzDqG6 for ; Wed, 15 Nov 2017 04:00:22 +1100 (AEDT) X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=mellanox.com (client-ip=193.47.165.129; helo=mellanox.co.il; envelope-from=oleksandrs@mellanox.com; receiver=) Received: from mellanox.co.il (mail-il-dmz.mellanox.com [193.47.165.129]) by lists.ozlabs.org (Postfix) with ESMTP id 3ybtvM1DNtzDqF4 for ; Wed, 15 Nov 2017 03:56:30 +1100 (AEDT) Received: from Internal Mail-Server by MTLPINE1 (envelope-from oleksandrs@mellanox.com) with ESMTPS (AES256-SHA encrypted); 14 Nov 2017 18:11:09 +0200 Received: from r-vnc16.mtr.labs.mlnx (r-vnc16.mtr.labs.mlnx [10.208.0.16]) by labmailer.mlnx (8.13.8/8.13.8) with ESMTP id vAEGB8m9031535; Tue, 14 Nov 2017 18:11:09 +0200 From: Oleksandr Shamray To: gregkh@linuxfoundation.org, arnd@arndb.de Subject: [patch v12 4/4] Documentation: jtag: Add ABI documentation Date: Tue, 14 Nov 2017 18:11:07 +0200 Message-Id: <1510675867-24276-5-git-send-email-oleksandrs@mellanox.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> References: <1510675867-24276-1-git-send-email-oleksandrs@mellanox.com> X-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: system-sw-low-level@mellanox.com, devicetree@vger.kernel.org, jiri@resnulli.us, vadimp@mellanox.com, linux-api@vger.kernel.org, openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, openocd-devel-owner@lists.sourceforge.net, mec@shout.net, robh+dt@kernel.org, linux-serial@vger.kernel.org, Oleksandr Shamray , tklauser@distanz.ch, mchehab@kernel.org, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" Added document that describe the ABI for JTAG class drivrer Signed-off-by: Oleksandr Shamray Acked-by: Arnd Bergmann --- v11->v12 Tobias Klauser - rename /Documentation/ABI/testing/jatg-dev -> jtag-dev - Typo: s/interfase/interface v10->v11 v9->v10 Fixes added by Oleksandr: - change jtag-cdev to jtag-dev in documentation - update Kernel Version and Date in jtag-dev documentation; v8->v9 v7->v8 v6->v7 Comments pointed by Pavel Machek - Added jtag-cdev documentation to Documentation/ABI/testing folder --- Documentation/ABI/testing/jtag-dev | 27 +++++++++++++++++++++++++++ 1 files changed, 27 insertions(+), 0 deletions(-) create mode 100644 Documentation/ABI/testing/jtag-dev diff --git a/Documentation/ABI/testing/jtag-dev b/Documentation/ABI/testing/jtag-dev new file mode 100644 index 0000000..cab867d --- /dev/null +++ b/Documentation/ABI/testing/jtag-dev @@ -0,0 +1,27 @@ +What: /dev/jtag[0-9]+ +Date: October 2017 +KernelVersion: 4.15 +Contact: oleksandrs@mellanox.com +Description: + The misc device files /dev/jtag* are the interface + between JTAG master interface and userspace. + + The ioctl(2)-based ABI is defined and documented in + [include/uapi]. + + The following file operations are supported: + + open(2) + The argument flag currently support only one access + mode O_RDWR. + + ioctl(2) + Initiate various actions. + See the inline documentation in [include/uapi] + for descriptions of all ioctls. + + close(2) + Stops and free up the I/O contexts that was associated + with the file descriptor. + +Users: TBD \ No newline at end of file