drivers/thunderbolt/ctl.h

   1 /*
   2  * Thunderbolt Cactus Ridge driver - control channel and configuration commands
   3  *
   4  * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
   5  */
   6
   7 #ifndef _TB_CFG
   8 #define _TB_CFG
   9
  10 #include "nhi.h"
  11 #include "tb_msgs.h"
  12
  13 /* control channel */
  14 struct tb_ctl;
  15
  16 typedef void (*hotplug_cb)(void *data, u64 route, u8 port, bool unplug);
  17
  18 struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, hotplug_cb cb, void *cb_data);
  19 void tb_ctl_start(struct tb_ctl *ctl);
  20 void tb_ctl_stop(struct tb_ctl *ctl);
  21 void tb_ctl_free(struct tb_ctl *ctl);
  22
  23 /* configuration commands */
  24
  25 #define TB_CFG_DEFAULT_TIMEOUT 5000 /* msec */
  26
  27 struct tb_cfg_result {
  28         u64 response_route;
  29         u32 response_port; /*
  30                             * If err = 1 then this is the port that send the
  31                             * error.
  32                             * If err = 0 and if this was a cfg_read/write then
  33                             * this is the the upstream port of the responding
  34                             * switch.
  35                             * Otherwise the field is set to zero.
  36                             */
  37         int err; /* negative errors, 0 for success, 1 for tb errors */
  38         enum tb_cfg_error tb_error; /* valid if err == 1 */
  39 };
  40
  41 static inline u64 tb_cfg_get_route(const struct tb_cfg_header *header)
  42 {
  43         return (u64) header->route_hi << 32 | header->route_lo;
  44 }
  45
  46 static inline struct tb_cfg_header tb_cfg_make_header(u64 route)
  47 {
  48         struct tb_cfg_header header = {
  49                 .route_hi = route >> 32,
  50                 .route_lo = route,
  51         };
  52         /* check for overflow, route_hi is not 32 bits! */
  53         WARN_ON(tb_cfg_get_route(&header) != route);
  54         return header;
  55 }
  56
  57 int tb_cfg_error(struct tb_ctl *ctl, u64 route, u32 port,
  58                  enum tb_cfg_error error);
  59 struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route,
  60                                   int timeout_msec);
  61 struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer,
  62                                      u64 route, u32 port,
  63                                      enum tb_cfg_space space, u32 offset,
  64                                      u32 length, int timeout_msec);
  65 struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer,
  66                                       u64 route, u32 port,
  67                                       enum tb_cfg_space space, u32 offset,
  68                                       u32 length, int timeout_msec);
  69 int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port,
  70                 enum tb_cfg_space space, u32 offset, u32 length);
  71 int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port,
  72                  enum tb_cfg_space space, u32 offset, u32 length);
  73 int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route);
  74
  75
  76 #endif