drivers/slimbus/slimbus.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (c) 2011-2017, The Linux Foundation
   4  */
   5
   6 #ifndef _DRIVERS_SLIMBUS_H
   7 #define _DRIVERS_SLIMBUS_H
   8 #include <linux/module.h>
   9 #include <linux/device.h>
  10 #include <linux/mutex.h>
  11 #include <linux/completion.h>
  12 #include <linux/slimbus.h>
  13
  14 /* Standard values per SLIMbus spec needed by controllers and devices */
  15 #define SLIM_CL_PER_SUPERFRAME          6144
  16 #define SLIM_CL_PER_SUPERFRAME_DIV8     (SLIM_CL_PER_SUPERFRAME >> 3)
  17
  18 /* SLIMbus message types. Related to interpretation of message code. */
  19 #define SLIM_MSG_MT_CORE                        0x0
  20 #define SLIM_MSG_MT_DEST_REFERRED_USER          0x2
  21 #define SLIM_MSG_MT_SRC_REFERRED_USER           0x6
  22
  23 /*
  24  * SLIM Broadcast header format
  25  * BYTE 0: MT[7:5] RL[4:0]
  26  * BYTE 1: RSVD[7] MC[6:0]
  27  * BYTE 2: RSVD[7:6] DT[5:4] PI[3:0]
  28  */
  29 #define SLIM_MSG_MT_MASK        GENMASK(2, 0)
  30 #define SLIM_MSG_MT_SHIFT       5
  31 #define SLIM_MSG_RL_MASK        GENMASK(4, 0)
  32 #define SLIM_MSG_RL_SHIFT       0
  33 #define SLIM_MSG_MC_MASK        GENMASK(6, 0)
  34 #define SLIM_MSG_MC_SHIFT       0
  35 #define SLIM_MSG_DT_MASK        GENMASK(1, 0)
  36 #define SLIM_MSG_DT_SHIFT       4
  37
  38 #define SLIM_HEADER_GET_MT(b)   ((b >> SLIM_MSG_MT_SHIFT) & SLIM_MSG_MT_MASK)
  39 #define SLIM_HEADER_GET_RL(b)   ((b >> SLIM_MSG_RL_SHIFT) & SLIM_MSG_RL_MASK)
  40 #define SLIM_HEADER_GET_MC(b)   ((b >> SLIM_MSG_MC_SHIFT) & SLIM_MSG_MC_MASK)
  41 #define SLIM_HEADER_GET_DT(b)   ((b >> SLIM_MSG_DT_SHIFT) & SLIM_MSG_DT_MASK)
  42
  43 /* Device management messages used by this framework */
  44 #define SLIM_MSG_MC_REPORT_PRESENT               0x1
  45 #define SLIM_MSG_MC_ASSIGN_LOGICAL_ADDRESS       0x2
  46 #define SLIM_MSG_MC_REPORT_ABSENT                0xF
  47
  48 /* Data channel management messages */
  49 #define SLIM_MSG_MC_CONNECT_SOURCE              0x10
  50 #define SLIM_MSG_MC_CONNECT_SINK                0x11
  51 #define SLIM_MSG_MC_DISCONNECT_PORT             0x14
  52 #define SLIM_MSG_MC_CHANGE_CONTENT              0x18
  53
  54 /* Clock pause Reconfiguration messages */
  55 #define SLIM_MSG_MC_BEGIN_RECONFIGURATION        0x40
  56 #define SLIM_MSG_MC_NEXT_PAUSE_CLOCK             0x4A
  57 #define SLIM_MSG_MC_NEXT_DEFINE_CHANNEL          0x50
  58 #define SLIM_MSG_MC_NEXT_DEFINE_CONTENT          0x51
  59 #define SLIM_MSG_MC_NEXT_ACTIVATE_CHANNEL        0x54
  60 #define SLIM_MSG_MC_NEXT_DEACTIVATE_CHANNEL      0x55
  61 #define SLIM_MSG_MC_NEXT_REMOVE_CHANNEL          0x58
  62 #define SLIM_MSG_MC_RECONFIGURE_NOW              0x5F
  63
  64 /* Clock pause values per SLIMbus spec */
  65 #define SLIM_CLK_FAST                           0
  66 #define SLIM_CLK_CONST_PHASE                    1
  67 #define SLIM_CLK_UNSPECIFIED                    2
  68
  69 /* Destination type Values */
  70 #define SLIM_MSG_DEST_LOGICALADDR       0
  71 #define SLIM_MSG_DEST_ENUMADDR          1
  72 #define SLIM_MSG_DEST_BROADCAST         3
  73
  74 /* Standard values per SLIMbus spec needed by controllers and devices */
  75 #define SLIM_MAX_CLK_GEAR               10
  76 #define SLIM_MIN_CLK_GEAR               1
  77 #define SLIM_SLOT_LEN_BITS              4
  78
  79 /* Indicate that the frequency of the flow and the bus frequency are locked */
  80 #define SLIM_CHANNEL_CONTENT_FL         BIT(7)
  81
  82 /* Standard values per SLIMbus spec needed by controllers and devices */
  83 #define SLIM_CL_PER_SUPERFRAME          6144
  84 #define SLIM_SLOTS_PER_SUPERFRAME       (SLIM_CL_PER_SUPERFRAME >> 2)
  85 #define SLIM_SL_PER_SUPERFRAME          (SLIM_CL_PER_SUPERFRAME >> 2)
  86 /* Manager's logical address is set to 0xFF per spec */
  87 #define SLIM_LA_MANAGER 0xFF
  88
  89 #define SLIM_MAX_TIDS                   256
  90 /**
  91  * struct slim_framer - Represents SLIMbus framer.
  92  * Every controller may have multiple framers. There is 1 active framer device
  93  * responsible for clocking the bus.
  94  * Manager is responsible for framer hand-over.
  95  * @dev: Driver model representation of the device.
  96  * @e_addr: Enumeration address of the framer.
  97  * @rootfreq: Root Frequency at which the framer can run. This is maximum
  98  *      frequency ('clock gear 10') at which the bus can operate.
  99  * @superfreq: Superframes per root frequency. Every frame is 6144 bits.
 100  */
 101 struct slim_framer {
 102         struct device           dev;
 103         struct slim_eaddr       e_addr;
 104         int                     rootfreq;
 105         int                     superfreq;
 106 };
 107
 108 #define to_slim_framer(d) container_of(d, struct slim_framer, dev)
 109
 110 /**
 111  * struct slim_msg_txn - Message to be sent by the controller.
 112  *                      This structure has packet header,
 113  *                      payload and buffer to be filled (if any)
 114  * @rl: Header field. remaining length.
 115  * @mt: Header field. Message type.
 116  * @mc: Header field. LSB is message code for type mt.
 117  * @dt: Header field. Destination type.
 118  * @ec: Element code. Used for elemental access APIs.
 119  * @tid: Transaction ID. Used for messages expecting response.
 120  *      (relevant for message-codes involving read operation)
 121  * @la: Logical address of the device this message is going to.
 122  *      (Not used when destination type is broadcast.)
 123  * @msg: Elemental access message to be read/written
 124  * @comp: completion if read/write is synchronous, used internally
 125  *      for tid based transactions.
 126  */
 127 struct slim_msg_txn {
 128         u8                      rl;
 129         u8                      mt;
 130         u8                      mc;
 131         u8                      dt;
 132         u16                     ec;
 133         u8                      tid;
 134         u8                      la;
 135         struct slim_val_inf     *msg;
 136         struct  completion      *comp;
 137 };
 138
 139 /* Frequently used message transaction structures */
 140 #define DEFINE_SLIM_LDEST_TXN(name, mc, rl, la, msg) \
 141         struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_LOGICALADDR, 0,\
 142                                         0, la, msg, }
 143
 144 #define DEFINE_SLIM_BCAST_TXN(name, mc, rl, la, msg) \
 145         struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_BROADCAST, 0,\
 146                                         0, la, msg, }
 147
 148 #define DEFINE_SLIM_EDEST_TXN(name, mc, rl, la, msg) \
 149         struct slim_msg_txn name = { rl, 0, mc, SLIM_MSG_DEST_ENUMADDR, 0,\
 150                                         0, la, msg, }
 151 /**
 152  * enum slim_clk_state: SLIMbus controller's clock state used internally for
 153  *      maintaining current clock state.
 154  * @SLIM_CLK_ACTIVE: SLIMbus clock is active
 155  * @SLIM_CLK_ENTERING_PAUSE: SLIMbus clock pause sequence is being sent on the
 156  *      bus. If this succeeds, state changes to SLIM_CLK_PAUSED. If the
 157  *      transition fails, state changes back to SLIM_CLK_ACTIVE
 158  * @SLIM_CLK_PAUSED: SLIMbus controller clock has paused.
 159  */
 160 enum slim_clk_state {
 161         SLIM_CLK_ACTIVE,
 162         SLIM_CLK_ENTERING_PAUSE,
 163         SLIM_CLK_PAUSED,
 164 };
 165
 166 /**
 167  * struct slim_sched: Framework uses this structure internally for scheduling.
 168  * @clk_state: Controller's clock state from enum slim_clk_state
 169  * @pause_comp: Signals completion of clock pause sequence. This is useful when
 170  *      client tries to call SLIMbus transaction when controller is entering
 171  *      clock pause.
 172  * @m_reconf: This mutex is held until current reconfiguration (data channel
 173  *      scheduling, message bandwidth reservation) is done. Message APIs can
 174  *      use the bus concurrently when this mutex is held since elemental access
 175  *      messages can be sent on the bus when reconfiguration is in progress.
 176  */
 177 struct slim_sched {
 178         enum slim_clk_state     clk_state;
 179         struct completion       pause_comp;
 180         struct mutex            m_reconf;
 181 };
 182
 183 /**
 184  * enum slim_port_direction: SLIMbus port direction
 185  *
 186  * @SLIM_PORT_SINK: SLIMbus port is a sink
 187  * @SLIM_PORT_SOURCE: SLIMbus port is a source
 188  */
 189 enum slim_port_direction {
 190         SLIM_PORT_SINK = 0,
 191         SLIM_PORT_SOURCE,
 192 };
 193 /**
 194  * enum slim_port_state: SLIMbus Port/Endpoint state machine
 195  *      according to SLIMbus Spec 2.0
 196  * @SLIM_PORT_DISCONNECTED: SLIMbus port is disconnected
 197  *      entered from Unconfigure/configured state after
 198  *      DISCONNECT_PORT or REMOVE_CHANNEL core command
 199  * @SLIM_PORT_UNCONFIGURED: SLIMbus port is in unconfigured state.
 200  *      entered from disconnect state after CONNECT_SOURCE/SINK core command
 201  * @SLIM_PORT_CONFIGURED: SLIMbus port is in configured state.
 202  *      entered from unconfigured state after DEFINE_CHANNEL, DEFINE_CONTENT
 203  *      and ACTIVATE_CHANNEL core commands. Ready for data transmission.
 204  */
 205 enum slim_port_state {
 206         SLIM_PORT_DISCONNECTED = 0,
 207         SLIM_PORT_UNCONFIGURED,
 208         SLIM_PORT_CONFIGURED,
 209 };
 210
 211 /**
 212  * enum slim_channel_state: SLIMbus channel state machine used by core.
 213  * @SLIM_CH_STATE_DISCONNECTED: SLIMbus channel is disconnected
 214  * @SLIM_CH_STATE_ALLOCATED: SLIMbus channel is allocated
 215  * @SLIM_CH_STATE_ASSOCIATED: SLIMbus channel is associated with port
 216  * @SLIM_CH_STATE_DEFINED: SLIMbus channel parameters are defined
 217  * @SLIM_CH_STATE_CONTENT_DEFINED: SLIMbus channel content is defined
 218  * @SLIM_CH_STATE_ACTIVE: SLIMbus channel is active and ready for data
 219  * @SLIM_CH_STATE_REMOVED: SLIMbus channel is inactive and removed
 220  */
 221 enum slim_channel_state {
 222         SLIM_CH_STATE_DISCONNECTED = 0,
 223         SLIM_CH_STATE_ALLOCATED,
 224         SLIM_CH_STATE_ASSOCIATED,
 225         SLIM_CH_STATE_DEFINED,
 226         SLIM_CH_STATE_CONTENT_DEFINED,
 227         SLIM_CH_STATE_ACTIVE,
 228         SLIM_CH_STATE_REMOVED,
 229 };
 230
 231 /**
 232  * enum slim_ch_data_fmt: SLIMbus channel data Type identifiers according to
 233  *      Table 60 of SLIMbus Spec 1.01.01
 234  * @SLIM_CH_DATA_FMT_NOT_DEFINED: Undefined
 235  * @SLIM_CH_DATA_FMT_LPCM_AUDIO: LPCM audio
 236  * @SLIM_CH_DATA_FMT_IEC61937_COMP_AUDIO: IEC61937 Compressed audio
 237  * @SLIM_CH_DATA_FMT_PACKED_PDM_AUDIO: Packed PDM audio
 238  */
 239 enum slim_ch_data_fmt {
 240         SLIM_CH_DATA_FMT_NOT_DEFINED = 0,
 241         SLIM_CH_DATA_FMT_LPCM_AUDIO = 1,
 242         SLIM_CH_DATA_FMT_IEC61937_COMP_AUDIO = 2,
 243         SLIM_CH_DATA_FMT_PACKED_PDM_AUDIO = 3,
 244 };
 245
 246 /**
 247  * enum slim_ch_aux_fmt: SLIMbus channel Aux Field format IDs according to
 248  *      Table 63 of SLIMbus Spec 2.0
 249  * @SLIM_CH_AUX_FMT_NOT_APPLICABLE: Undefined
 250  * @SLIM_CH_AUX_FMT_ZCUV_TUNNEL_IEC60958: ZCUV for tunneling IEC60958
 251  * @SLIM_CH_AUX_FMT_USER_DEFINED: User defined
 252  */
 253 enum slim_ch_aux_bit_fmt {
 254         SLIM_CH_AUX_FMT_NOT_APPLICABLE = 0,
 255         SLIM_CH_AUX_FMT_ZCUV_TUNNEL_IEC60958 = 1,
 256         SLIM_CH_AUX_FMT_USER_DEFINED = 0xF,
 257 };
 258
 259 /**
 260  * struct slim_channel  - SLIMbus channel, used for state machine
 261  *
 262  * @id: ID of channel
 263  * @prrate: Presense rate of channel from Table 66 of SLIMbus 2.0 Specs
 264  * @seg_dist: segment distribution code from Table 20 of SLIMbus 2.0 Specs
 265  * @data_fmt: Data format of channel.
 266  * @aux_fmt: Aux format for this channel.
 267  * @state: channel state machine
 268  */
 269 struct slim_channel {
 270         int id;
 271         int prrate;
 272         int seg_dist;
 273         enum slim_ch_data_fmt data_fmt;
 274         enum slim_ch_aux_bit_fmt aux_fmt;
 275         enum slim_channel_state state;
 276 };
 277
 278 /**
 279  * struct slim_port  - SLIMbus port
 280  *
 281  * @id: Port id
 282  * @direction: Port direction, Source or Sink.
 283  * @state: state machine of port.
 284  * @ch: channel associated with this port.
 285  */
 286 struct slim_port {
 287         int id;
 288         enum slim_port_direction direction;
 289         enum slim_port_state state;
 290         struct slim_channel ch;
 291 };
 292
 293 /**
 294  * enum slim_transport_protocol: SLIMbus Transport protocol list from
 295  *      Table 47 of SLIMbus 2.0 specs.
 296  * @SLIM_PROTO_ISO: Isochronous Protocol, no flow control as data rate match
 297  *              channel rate flow control embedded in the data.
 298  * @SLIM_PROTO_PUSH: Pushed Protocol, includes flow control, Used to carry
 299  *              data whose rate is equal to, or lower than the channel rate.
 300  * @SLIM_PROTO_PULL: Pulled Protocol, similar usage as pushed protocol
 301  *              but pull is a unicast.
 302  * @SLIM_PROTO_LOCKED: Locked Protocol
 303  * @SLIM_PROTO_ASYNC_SMPLX: Asynchronous Protocol-Simplex
 304  * @SLIM_PROTO_ASYNC_HALF_DUP: Asynchronous Protocol-Half-duplex
 305  * @SLIM_PROTO_EXT_SMPLX: Extended Asynchronous Protocol-Simplex
 306  * @SLIM_PROTO_EXT_HALF_DUP: Extended Asynchronous Protocol-Half-duplex
 307  */
 308 enum slim_transport_protocol {
 309         SLIM_PROTO_ISO = 0,
 310         SLIM_PROTO_PUSH,
 311         SLIM_PROTO_PULL,
 312         SLIM_PROTO_LOCKED,
 313         SLIM_PROTO_ASYNC_SMPLX,
 314         SLIM_PROTO_ASYNC_HALF_DUP,
 315         SLIM_PROTO_EXT_SMPLX,
 316         SLIM_PROTO_EXT_HALF_DUP,
 317 };
 318
 319 /**
 320  * struct slim_stream_runtime  - SLIMbus stream runtime instance
 321  *
 322  * @name: Name of the stream
 323  * @dev: SLIM Device instance associated with this stream
 324  * @direction: direction of stream
 325  * @prot: Transport protocol used in this stream
 326  * @rate: Data rate of samples *
 327  * @bps: bits per sample
 328  * @ratem: rate multipler which is super frame rate/data rate
 329  * @num_ports: number of ports
 330  * @ports: pointer to instance of ports
 331  * @node: list head for stream associated with slim device.
 332  */
 333 struct slim_stream_runtime {
 334         const char *name;
 335         struct slim_device *dev;
 336         int direction;
 337         enum slim_transport_protocol prot;
 338         unsigned int rate;
 339         unsigned int bps;
 340         unsigned int ratem;
 341         int num_ports;
 342         struct slim_port *ports;
 343         struct list_head node;
 344 };
 345
 346 /**
 347  * struct slim_controller  - Controls every instance of SLIMbus
 348  *                              (similar to 'master' on SPI)
 349  * @dev: Device interface to this driver
 350  * @id: Board-specific number identifier for this controller/bus
 351  * @name: Name for this controller
 352  * @min_cg: Minimum clock gear supported by this controller (default value: 1)
 353  * @max_cg: Maximum clock gear supported by this controller (default value: 10)
 354  * @clkgear: Current clock gear in which this bus is running
 355  * @laddr_ida: logical address id allocator
 356  * @a_framer: Active framer which is clocking the bus managed by this controller
 357  * @lock: Mutex protecting controller data structures
 358  * @devices: Slim device list
 359  * @tid_idr: tid id allocator
 360  * @txn_lock: Lock to protect table of transactions
 361  * @sched: scheduler structure used by the controller
 362  * @xfer_msg: Transfer a message on this controller (this can be a broadcast
 363  *      control/status message like data channel setup, or a unicast message
 364  *      like value element read/write.
 365  * @set_laddr: Setup logical address at laddr for the slave with elemental
 366  *      address e_addr. Drivers implementing controller will be expected to
 367  *      send unicast message to this device with its logical address.
 368  * @get_laddr: It is possible that controller needs to set fixed logical
 369  *      address table and get_laddr can be used in that case so that controller
 370  *      can do this assignment. Use case is when the master is on the remote
 371  *      processor side, who is resposible for allocating laddr.
 372  * @wakeup: This function pointer implements controller-specific procedure
 373  *      to wake it up from clock-pause. Framework will call this to bring
 374  *      the controller out of clock pause.
 375  * @enable_stream: This function pointer implements controller-specific procedure
 376  *      to enable a stream.
 377  * @disable_stream: This function pointer implements controller-specific procedure
 378  *      to disable stream.
 379  *
 380  *      'Manager device' is responsible for  device management, bandwidth
 381  *      allocation, channel setup, and port associations per channel.
 382  *      Device management means Logical address assignment/removal based on
 383  *      enumeration (report-present, report-absent) of a device.
 384  *      Bandwidth allocation is done dynamically by the manager based on active
 385  *      channels on the bus, message-bandwidth requests made by SLIMbus devices.
 386  *      Based on current bandwidth usage, manager chooses a frequency to run
 387  *      the bus at (in steps of 'clock-gear', 1 through 10, each clock gear
 388  *      representing twice the frequency than the previous gear).
 389  *      Manager is also responsible for entering (and exiting) low-power-mode
 390  *      (known as 'clock pause').
 391  *      Manager can do handover of framer if there are multiple framers on the
 392  *      bus and a certain usecase warrants using certain framer to avoid keeping
 393  *      previous framer being powered-on.
 394  *
 395  *      Controller here performs duties of the manager device, and 'interface
 396  *      device'. Interface device is responsible for monitoring the bus and
 397  *      reporting information such as loss-of-synchronization, data
 398  *      slot-collision.
 399  */
 400 struct slim_controller {
 401         struct device           *dev;
 402         unsigned int            id;
 403         char                    name[SLIMBUS_NAME_SIZE];
 404         int                     min_cg;
 405         int                     max_cg;
 406         int                     clkgear;
 407         struct ida              laddr_ida;
 408         struct slim_framer      *a_framer;
 409         struct mutex            lock;
 410         struct list_head        devices;
 411         struct idr              tid_idr;
 412         spinlock_t              txn_lock;
 413         struct slim_sched       sched;
 414         int                     (*xfer_msg)(struct slim_controller *ctrl,
 415                                             struct slim_msg_txn *tx);
 416         int                     (*set_laddr)(struct slim_controller *ctrl,
 417                                              struct slim_eaddr *ea, u8 laddr);
 418         int                     (*get_laddr)(struct slim_controller *ctrl,
 419                                              struct slim_eaddr *ea, u8 *laddr);
 420         int             (*enable_stream)(struct slim_stream_runtime *rt);
 421         int             (*disable_stream)(struct slim_stream_runtime *rt);
 422         int                     (*wakeup)(struct slim_controller *ctrl);
 423 };
 424
 425 int slim_device_report_present(struct slim_controller *ctrl,
 426                                struct slim_eaddr *e_addr, u8 *laddr);
 427 void slim_report_absent(struct slim_device *sbdev);
 428 int slim_register_controller(struct slim_controller *ctrl);
 429 int slim_unregister_controller(struct slim_controller *ctrl);
 430 void slim_msg_response(struct slim_controller *ctrl, u8 *reply, u8 tid, u8 l);
 431 int slim_do_transfer(struct slim_controller *ctrl, struct slim_msg_txn *txn);
 432 int slim_ctrl_clk_pause(struct slim_controller *ctrl, bool wakeup, u8 restart);
 433 int slim_alloc_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn);
 434 void slim_free_txn_tid(struct slim_controller *ctrl, struct slim_msg_txn *txn);
 435
 436 static inline bool slim_tid_txn(u8 mt, u8 mc)
 437 {
 438         return (mt == SLIM_MSG_MT_CORE &&
 439                 (mc == SLIM_MSG_MC_REQUEST_INFORMATION ||
 440                  mc == SLIM_MSG_MC_REQUEST_CLEAR_INFORMATION ||
 441                  mc == SLIM_MSG_MC_REQUEST_VALUE ||
 442                  mc == SLIM_MSG_MC_REQUEST_CHANGE_VALUE));
 443 }
 444
 445 static inline bool slim_ec_txn(u8 mt, u8 mc)
 446 {
 447         return (mt == SLIM_MSG_MT_CORE &&
 448                 ((mc >= SLIM_MSG_MC_REQUEST_INFORMATION &&
 449                   mc <= SLIM_MSG_MC_REPORT_INFORMATION) ||
 450                  (mc >= SLIM_MSG_MC_REQUEST_VALUE &&
 451                   mc <= SLIM_MSG_MC_CHANGE_VALUE)));
 452 }
 453 #endif /* _LINUX_SLIMBUS_H */