linux/drivers/thunderbolt/tb_regs.h
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

241 lines
5.8 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Thunderbolt Cactus Ridge driver - Port/Switch config area registers
*
* Every thunderbolt device consists (logically) of a switch with multiple
* ports. Every port contains up to four config regions (HOPS, PORT, SWITCH,
* COUNTERS) which are used to configure the device.
*
* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
*/
#ifndef _TB_REGS
#define _TB_REGS
#include <linux/types.h>
#define TB_ROUTE_SHIFT 8 /* number of bits in a port entry of a route */
/*
* TODO: should be 63? But we do not know how to receive frames larger than 256
* bytes at the frame level. (header + checksum = 16, 60*4 = 240)
*/
#define TB_MAX_CONFIG_RW_LENGTH 60
enum tb_switch_cap {
TB_SWITCH_CAP_VSE = 0x05,
};
enum tb_switch_vse_cap {
TB_VSE_CAP_PLUG_EVENTS = 0x01, /* also EEPROM */
TB_VSE_CAP_TIME2 = 0x03,
TB_VSE_CAP_IECS = 0x04,
TB_VSE_CAP_LINK_CONTROLLER = 0x06, /* also IECS */
};
enum tb_port_cap {
TB_PORT_CAP_PHY = 0x01,
TB_PORT_CAP_TIME1 = 0x03,
TB_PORT_CAP_ADAP = 0x04,
TB_PORT_CAP_VSE = 0x05,
};
enum tb_port_state {
TB_PORT_DISABLED = 0, /* tb_cap_phy.disable == 1 */
TB_PORT_CONNECTING = 1, /* retry */
TB_PORT_UP = 2,
TB_PORT_UNPLUGGED = 7,
};
/* capability headers */
struct tb_cap_basic {
u8 next;
/* enum tb_cap cap:8; prevent "narrower than values of its type" */
u8 cap; /* if cap == 0x05 then we have a extended capability */
} __packed;
/**
* struct tb_cap_extended_short - Switch extended short capability
* @next: Pointer to the next capability. If @next and @length are zero
* then we have a long cap.
* @cap: Base capability ID (see &enum tb_switch_cap)
* @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)
* @length: Length of this capability
*/
struct tb_cap_extended_short {
u8 next;
u8 cap;
u8 vsec_id;
u8 length;
} __packed;
/**
* struct tb_cap_extended_long - Switch extended long capability
* @zero1: This field should be zero
* @cap: Base capability ID (see &enum tb_switch_cap)
* @vsec_id: Vendor specific capability ID (see &enum switch_vse_cap)
* @zero2: This field should be zero
* @next: Pointer to the next capability
* @length: Length of this capability
*/
struct tb_cap_extended_long {
u8 zero1;
u8 cap;
u8 vsec_id;
u8 zero2;
u16 next;
u16 length;
} __packed;
/* capabilities */
struct tb_cap_link_controller {
struct tb_cap_extended_long cap_header;
u32 count:4; /* number of link controllers */
u32 unknown1:4;
u32 base_offset:8; /*
* offset (into this capability) of the configuration
* area of the first link controller
*/
u32 length:12; /* link controller configuration area length */
u32 unknown2:4; /* TODO check that length is correct */
} __packed;
struct tb_cap_phy {
struct tb_cap_basic cap_header;
u32 unknown1:16;
u32 unknown2:14;
bool disable:1;
u32 unknown3:11;
enum tb_port_state state:4;
u32 unknown4:2;
} __packed;
struct tb_eeprom_ctl {
bool clock:1; /* send pulse to transfer one bit */
bool access_low:1; /* set to 0 before access */
bool data_out:1; /* to eeprom */
bool data_in:1; /* from eeprom */
bool access_high:1; /* set to 1 before access */
bool not_present:1; /* should be 0 */
bool unknown1:1;
bool present:1; /* should be 1 */
u32 unknown2:24;
} __packed;
struct tb_cap_plug_events {
struct tb_cap_extended_short cap_header;
u32 __unknown1:2;
u32 plug_events:5;
u32 __unknown2:25;
u32 __unknown3;
u32 __unknown4;
struct tb_eeprom_ctl eeprom_ctl;
u32 __unknown5[7];
u32 drom_offset; /* 32 bit register, but eeprom addresses are 16 bit */
} __packed;
/* device headers */
/* Present on port 0 in TB_CFG_SWITCH at address zero. */
struct tb_regs_switch_header {
/* DWORD 0 */
u16 vendor_id;
u16 device_id;
/* DWORD 1 */
u32 first_cap_offset:8;
u32 upstream_port_number:6;
u32 max_port_number:6;
u32 depth:3;
u32 __unknown1:1;
u32 revision:8;
/* DWORD 2 */
u32 route_lo;
/* DWORD 3 */
u32 route_hi:31;
bool enabled:1;
/* DWORD 4 */
u32 plug_events_delay:8; /*
* RW, pause between plug events in
* milliseconds. Writing 0x00 is interpreted
* as 255ms.
*/
u32 __unknown4:16;
u32 thunderbolt_version:8;
} __packed;
enum tb_port_type {
TB_TYPE_INACTIVE = 0x000000,
TB_TYPE_PORT = 0x000001,
TB_TYPE_NHI = 0x000002,
/* TB_TYPE_ETHERNET = 0x020000, lower order bits are not known */
/* TB_TYPE_SATA = 0x080000, lower order bits are not known */
TB_TYPE_DP_HDMI_IN = 0x0e0101,
TB_TYPE_DP_HDMI_OUT = 0x0e0102,
TB_TYPE_PCIE_DOWN = 0x100101,
TB_TYPE_PCIE_UP = 0x100102,
/* TB_TYPE_USB = 0x200000, lower order bits are not known */
};
/* Present on every port in TB_CF_PORT at address zero. */
struct tb_regs_port_header {
/* DWORD 0 */
u16 vendor_id;
u16 device_id;
/* DWORD 1 */
u32 first_cap_offset:8;
u32 max_counters:11;
u32 __unknown1:5;
u32 revision:8;
/* DWORD 2 */
enum tb_port_type type:24;
u32 thunderbolt_version:8;
/* DWORD 3 */
u32 __unknown2:20;
u32 port_number:6;
u32 __unknown3:6;
/* DWORD 4 */
u32 nfc_credits;
/* DWORD 5 */
u32 max_in_hop_id:11;
u32 max_out_hop_id:11;
u32 __unkown4:10;
/* DWORD 6 */
u32 __unknown5;
/* DWORD 7 */
u32 __unknown6;
} __packed;
/* Hop register from TB_CFG_HOPS. 8 byte per entry. */
struct tb_regs_hop {
/* DWORD 0 */
u32 next_hop:11; /*
* hop to take after sending the packet through
* out_port (on the incoming port of the next switch)
*/
u32 out_port:6; /* next port of the path (on the same switch) */
u32 initial_credits:8;
u32 unknown1:6; /* set to zero */
bool enable:1;
/* DWORD 1 */
u32 weight:4;
u32 unknown2:4; /* set to zero */
u32 priority:3;
bool drop_packages:1;
u32 counter:11; /* index into TB_CFG_COUNTERS on this port */
bool counter_enable:1;
bool ingress_fc:1;
bool egress_fc:1;
bool ingress_shared_buffer:1;
bool egress_shared_buffer:1;
u32 unknown3:4; /* set to zero */
} __packed;
#endif