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USB4 spec specifies standard access to retimers (both on-board and cable) through USB4 port sideband access. This makes it possible to upgrade their firmware in the same way than we already do with the routers. This enumerates on-board retimers under each USB4 port when the link comes up and adds them to the bus under the router the retimer belongs to. Retimers are exposed in sysfs with name like <device>:<port>.<index> where device is the router the retimer belongs to, port is the USB4 port the retimer is connected to and index is the retimer index under that port (starting from 1). This applies to the upstream USB4 port as well so if there is on-board retimer between the port and the router it is also added accordingly. At this time we do not add cable retimers but there is no techincal restriction to do so in the future if needed. It is not clear whether it makes sense to upgrade their firmwares and at least Thunderbolt 3 cables it has not been done outside of lab environments. The sysfs interface is made to follow the router NVM upgrade to make it easy to extend the existing userspace (fwupd) to handle these as well. Signed-off-by: Kranthi Kuntala <kranthi.kuntala@intel.com> Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
34 lines
1.0 KiB
C
34 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* USB4 port sideband registers found on routers and retimers
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*
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* Copyright (C) 2020, Intel Corporation
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Rajmohan Mani <rajmohan.mani@intel.com>
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*/
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#ifndef _SB_REGS
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#define _SB_REGS
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#define USB4_SB_VENDOR_ID 0x00
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#define USB4_SB_PRODUCT_ID 0x01
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#define USB4_SB_OPCODE 0x08
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enum usb4_sb_opcode {
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USB4_SB_OPCODE_ERR = 0x20525245, /* "ERR " */
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USB4_SB_OPCODE_ONS = 0x444d4321, /* "!CMD" */
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USB4_SB_OPCODE_ENUMERATE_RETIMERS = 0x4d554e45, /* "ENUM" */
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USB4_SB_OPCODE_QUERY_LAST_RETIMER = 0x5453414c, /* "LAST" */
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USB4_SB_OPCODE_GET_NVM_SECTOR_SIZE = 0x53534e47, /* "GNSS" */
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USB4_SB_OPCODE_NVM_SET_OFFSET = 0x53504f42, /* "BOPS" */
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USB4_SB_OPCODE_NVM_BLOCK_WRITE = 0x574b4c42, /* "BLKW" */
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USB4_SB_OPCODE_NVM_AUTH_WRITE = 0x48545541, /* "AUTH" */
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USB4_SB_OPCODE_NVM_READ = 0x52524641, /* "AFRR" */
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};
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#define USB4_SB_METADATA 0x09
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#define USB4_SB_METADATA_NVM_AUTH_WRITE_MASK GENMASK(5, 0)
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#define USB4_SB_DATA 0x12
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#endif
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