1 /* 2 * bdc.h - header for the BRCM BDC USB3.0 device controller 3 * 4 * Copyright (C) 2014 Broadcom Corporation 5 * 6 * Author: Ashwini Pahuja 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15 #ifndef __LINUX_BDC_H__ 16 #define __LINUX_BDC_H__ 17 18 #include <linux/kernel.h> 19 #include <linux/usb.h> 20 #include <linux/device.h> 21 #include <linux/spinlock.h> 22 #include <linux/list.h> 23 #include <linux/dma-mapping.h> 24 #include <linux/mm.h> 25 #include <linux/debugfs.h> 26 #include <linux/usb/ch9.h> 27 #include <linux/usb/gadget.h> 28 #include <asm/unaligned.h> 29 30 #define BRCM_BDC_NAME "bdc" 31 #define BRCM_BDC_DESC "Broadcom USB Device Controller driver" 32 33 #define DMA_ADDR_INVALID (~(dma_addr_t)0) 34 35 /* BDC command operation timeout in usec*/ 36 #define BDC_CMD_TIMEOUT 1000 37 /* BDC controller operation timeout in usec*/ 38 #define BDC_COP_TIMEOUT 500 39 40 /* 41 * Maximum size of ep0 response buffer for ch9 requests, 42 * the set_sel request uses 6 so far, the max. 43 */ 44 #define EP0_RESPONSE_BUFF 6 45 /* Start with SS as default */ 46 #define EP0_MAX_PKT_SIZE 512 47 48 /* 64 entries in a SRR */ 49 #define NUM_SR_ENTRIES 64 50 51 /* Num of bds per table */ 52 #define NUM_BDS_PER_TABLE 32 53 54 /* Num of tables in bd list for control,bulk and Int ep */ 55 #define NUM_TABLES 2 56 57 /* Num of tables in bd list for Isoch ep */ 58 #define NUM_TABLES_ISOCH 6 59 60 /* U1 Timeout default: 248usec */ 61 #define U1_TIMEOUT 0xf8 62 63 /* Interrupt coalescence in usec */ 64 #define INT_CLS 500 65 66 /* Register offsets */ 67 /* Configuration and Capability registers */ 68 #define BDC_BDCCFG0 0x00 69 #define BDC_BDCCFG1 0x04 70 #define BDC_BDCCAP0 0x08 71 #define BDC_BDCCAP1 0x0c 72 #define BDC_CMDPAR0 0x10 73 #define BDC_CMDPAR1 0x14 74 #define BDC_CMDPAR2 0x18 75 #define BDC_CMDSC 0x1c 76 #define BDC_USPC 0x20 77 #define BDC_USPPMS 0x28 78 #define BDC_USPPM2 0x2c 79 #define BDC_SPBBAL 0x38 80 #define BDC_SPBBAH 0x3c 81 #define BDC_BDCSC 0x40 82 #define BDC_XSFNTF 0x4c 83 84 #define BDC_DVCSA 0x50 85 #define BDC_DVCSB 0x54 86 #define BDC_EPSTS0 0x60 87 #define BDC_EPSTS1 0x64 88 #define BDC_EPSTS2 0x68 89 #define BDC_EPSTS3 0x6c 90 #define BDC_EPSTS4 0x70 91 #define BDC_EPSTS5 0x74 92 #define BDC_EPSTS6 0x78 93 #define BDC_EPSTS7 0x7c 94 #define BDC_SRRBAL(n) (0x200 + (n * 0x10)) 95 #define BDC_SRRBAH(n) (0x204 + (n * 0x10)) 96 #define BDC_SRRINT(n) (0x208 + (n * 0x10)) 97 #define BDC_INTCTLS(n) (0x20c + (n * 0x10)) 98 99 /* Extended capability regs */ 100 #define BDC_FSCNOC 0xcd4 101 #define BDC_FSCNIC 0xce4 102 #define NUM_NCS(p) (p >> 28) 103 104 /* Register bit fields and Masks */ 105 /* BDC Configuration 0 */ 106 #define BDC_PGS(p) (((p) & (0x7 << 8)) >> 8) 107 #define BDC_SPB(p) (p & 0x7) 108 109 /* BDC Capability1 */ 110 #define BDC_P64 (1 << 0) 111 112 /* BDC Command register */ 113 #define BDC_CMD_FH 0xe 114 #define BDC_CMD_DNC 0x6 115 #define BDC_CMD_EPO 0x4 116 #define BDC_CMD_BLA 0x3 117 #define BDC_CMD_EPC 0x2 118 #define BDC_CMD_DVC 0x1 119 #define BDC_CMD_CWS (0x1 << 5) 120 #define BDC_CMD_CST(p) (((p) & (0xf << 6))>>6) 121 #define BDC_CMD_EPN(p) ((p & 0x1f) << 10) 122 #define BDC_SUB_CMD_ADD (0x1 << 17) 123 #define BDC_SUB_CMD_FWK (0x4 << 17) 124 /* Reset sequence number */ 125 #define BDC_CMD_EPO_RST_SN (0x1 << 16) 126 #define BDC_CMD_EP0_XSD (0x1 << 16) 127 #define BDC_SUB_CMD_ADD_EP (0x1 << 17) 128 #define BDC_SUB_CMD_DRP_EP (0x2 << 17) 129 #define BDC_SUB_CMD_EP_STP (0x2 << 17) 130 #define BDC_SUB_CMD_EP_STL (0x4 << 17) 131 #define BDC_SUB_CMD_EP_RST (0x1 << 17) 132 #define BDC_CMD_SRD (1 << 27) 133 134 /* CMD completion status */ 135 #define BDC_CMDS_SUCC 0x1 136 #define BDC_CMDS_PARA 0x3 137 #define BDC_CMDS_STAT 0x4 138 #define BDC_CMDS_FAIL 0x5 139 #define BDC_CMDS_INTL 0x6 140 #define BDC_CMDS_BUSY 0xf 141 142 /* CMDSC Param 2 shifts */ 143 #define EPT_SHIFT 22 144 #define MP_SHIFT 10 145 #define MB_SHIFT 6 146 #define EPM_SHIFT 4 147 148 /* BDC USPSC */ 149 #define BDC_VBC (1 << 31) 150 #define BDC_PRC (1 << 30) 151 #define BDC_PCE (1 << 29) 152 #define BDC_CFC (1 << 28) 153 #define BDC_PCC (1 << 27) 154 #define BDC_PSC (1 << 26) 155 #define BDC_VBS (1 << 25) 156 #define BDC_PRS (1 << 24) 157 #define BDC_PCS (1 << 23) 158 #define BDC_PSP(p) (((p) & (0x7 << 20))>>20) 159 #define BDC_SCN (1 << 8) 160 #define BDC_SDC (1 << 7) 161 #define BDC_SWS (1 << 4) 162 163 #define BDC_USPSC_RW (BDC_SCN|BDC_SDC|BDC_SWS|0xf) 164 #define BDC_PSP(p) (((p) & (0x7 << 20))>>20) 165 166 #define BDC_SPEED_FS 0x1 167 #define BDC_SPEED_LS 0x2 168 #define BDC_SPEED_HS 0x3 169 #define BDC_SPEED_SS 0x4 170 171 #define BDC_PST(p) (p & 0xf) 172 #define BDC_PST_MASK 0xf 173 174 /* USPPMS */ 175 #define BDC_U2E (0x1 << 31) 176 #define BDC_U1E (0x1 << 30) 177 #define BDC_U2A (0x1 << 29) 178 #define BDC_PORT_W1S (0x1 << 17) 179 #define BDC_U1T(p) ((p) & 0xff) 180 #define BDC_U2T(p) (((p) & 0xff) << 8) 181 #define BDC_U1T_MASK 0xff 182 183 /* USBPM2 */ 184 /* Hardware LPM Enable */ 185 #define BDC_HLE (1 << 16) 186 187 /* BDC Status and Control */ 188 #define BDC_COP_RST (1 << 29) 189 #define BDC_COP_RUN (2 << 29) 190 #define BDC_COP_STP (4 << 29) 191 192 #define BDC_COP_MASK (BDC_COP_RST|BDC_COP_RUN|BDC_COP_STP) 193 194 #define BDC_COS (1 << 28) 195 #define BDC_CSTS(p) (((p) & (0x7 << 20)) >> 20) 196 #define BDC_MASK_MCW (1 << 7) 197 #define BDC_GIE (1 << 1) 198 #define BDC_GIP (1 << 0) 199 200 #define BDC_HLT 1 201 #define BDC_NOR 2 202 #define BDC_OIP 7 203 204 /* Buffer descriptor and Status report bit fields and masks */ 205 #define BD_TYPE_BITMASK (0xf) 206 #define BD_CHAIN 0xf 207 208 #define BD_TFS_SHIFT 4 209 #define BD_SOT (1 << 26) 210 #define BD_EOT (1 << 27) 211 #define BD_ISP (1 << 29) 212 #define BD_IOC (1 << 30) 213 #define BD_SBF (1 << 31) 214 215 #define BD_INTR_TARGET(p) (((p) & 0x1f) << 27) 216 217 #define BDC_SRR_RWS (1 << 4) 218 #define BDC_SRR_RST (1 << 3) 219 #define BDC_SRR_ISR (1 << 2) 220 #define BDC_SRR_IE (1 << 1) 221 #define BDC_SRR_IP (1 << 0) 222 #define BDC_SRR_EPI(p) (((p) & (0xff << 24)) >> 24) 223 #define BDC_SRR_DPI(p) (((p) & (0xff << 16)) >> 16) 224 #define BDC_SRR_DPI_MASK 0x00ff0000 225 226 #define MARK_CHAIN_BD (BD_CHAIN|BD_EOT|BD_SOT) 227 228 /* Control transfer BD specific fields */ 229 #define BD_DIR_IN (1 << 25) 230 231 #define BDC_PTC_MASK 0xf0000000 232 233 /* status report defines */ 234 #define SR_XSF 0 235 #define SR_USPC 4 236 #define SR_BD_LEN(p) (p & 0xffffff) 237 238 #define XSF_SUCC 0x1 239 #define XSF_SHORT 0x3 240 #define XSF_BABB 0x4 241 #define XSF_SETUP_RECV 0x6 242 #define XSF_DATA_START 0x7 243 #define XSF_STATUS_START 0x8 244 245 #define XSF_STS(p) (((p) >> 28) & 0xf) 246 247 /* Transfer BD fields */ 248 #define BD_LEN(p) ((p) & 0x1ffff) 249 #define BD_LTF (1 << 25) 250 #define BD_TYPE_DS 0x1 251 #define BD_TYPE_SS 0x2 252 253 #define BDC_EP_ENABLED (1 << 0) 254 #define BDC_EP_STALL (1 << 1) 255 #define BDC_EP_STOP (1 << 2) 256 257 /* One BD can transfer max 65536 bytes */ 258 #define BD_MAX_BUFF_SIZE (1 << 16) 259 /* Maximum bytes in one XFR, Refer to BDC spec */ 260 #define MAX_XFR_LEN 16777215 261 262 /* defines for Force Header command */ 263 #define DEV_NOTF_TYPE 6 264 #define FWK_SUBTYPE 1 265 #define TRA_PACKET 4 266 267 #define to_bdc_ep(e) container_of(e, struct bdc_ep, usb_ep) 268 #define to_bdc_req(r) container_of(r, struct bdc_req, usb_req) 269 #define gadget_to_bdc(g) container_of(g, struct bdc, gadget) 270 271 /* FUNCTION WAKE DEV NOTIFICATION interval, USB3 spec table 8.13 */ 272 #define BDC_TNOTIFY 2500 /*in ms*/ 273 /* Devstatus bitfields */ 274 #define REMOTE_WAKEUP_ISSUED (1 << 16) 275 #define DEVICE_SUSPENDED (1 << 17) 276 #define FUNC_WAKE_ISSUED (1 << 18) 277 #define REMOTE_WAKE_ENABLE (1 << USB_DEVICE_REMOTE_WAKEUP) 278 279 /* On disconnect, preserve these bits and clear rest */ 280 #define DEVSTATUS_CLEAR (1 << USB_DEVICE_SELF_POWERED) 281 /* Hardware and software Data structures */ 282 283 /* Endpoint bd: buffer descriptor */ 284 struct bdc_bd { 285 __le32 offset[4]; 286 }; 287 288 /* Status report in Status report ring(srr) */ 289 struct bdc_sr { 290 __le32 offset[4]; 291 }; 292 293 /* bd_table: contiguous bd's in a table */ 294 struct bd_table { 295 struct bdc_bd *start_bd; 296 /* dma address of start bd of table*/ 297 dma_addr_t dma; 298 }; 299 300 /* 301 * Each endpoint has a bdl(buffer descriptor list), bdl consists of 1 or more bd 302 * table's chained to each other through a chain bd, every table has equal 303 * number of bds. the software uses bdi(bd index) to refer to particular bd in 304 * the list. 305 */ 306 struct bd_list { 307 /* Array of bd table pointers*/ 308 struct bd_table **bd_table_array; 309 /* How many tables chained to each other */ 310 int num_tabs; 311 /* Max_bdi = num_tabs * num_bds_table - 1 */ 312 int max_bdi; 313 /* current enq bdi from sw point of view */ 314 int eqp_bdi; 315 /* current deq bdi from sw point of view */ 316 int hwd_bdi; 317 /* numbers of bds per table */ 318 int num_bds_table; 319 }; 320 321 struct bdc_req; 322 323 /* Representation of a transfer, one transfer can have multiple bd's */ 324 struct bd_transfer { 325 struct bdc_req *req; 326 /* start bd index */ 327 int start_bdi; 328 /* this will be the next hw dqp when this transfer completes */ 329 int next_hwd_bdi; 330 /* number of bds in this transfer */ 331 int num_bds; 332 }; 333 334 /* 335 * Representation of a gadget request, every gadget request is contained 336 * by 1 bd_transfer. 337 */ 338 struct bdc_req { 339 struct usb_request usb_req; 340 struct list_head queue; 341 struct bdc_ep *ep; 342 /* only one Transfer per request */ 343 struct bd_transfer bd_xfr; 344 int epnum; 345 }; 346 347 /* scratchpad buffer needed by bdc hardware */ 348 struct bdc_scratchpad { 349 dma_addr_t sp_dma; 350 void *buff; 351 u32 size; 352 }; 353 354 /* endpoint representation */ 355 struct bdc_ep { 356 struct usb_ep usb_ep; 357 struct list_head queue; 358 struct bdc *bdc; 359 u8 ep_type; 360 u8 dir; 361 u8 ep_num; 362 const struct usb_ss_ep_comp_descriptor *comp_desc; 363 const struct usb_endpoint_descriptor *desc; 364 unsigned int flags; 365 char name[20]; 366 /* endpoint bd list*/ 367 struct bd_list bd_list; 368 /* 369 * HW generates extra event for multi bd tranfers, this flag helps in 370 * ignoring the extra event 371 */ 372 bool ignore_next_sr; 373 }; 374 375 /* bdc cmmand parameter structure */ 376 struct bdc_cmd_params { 377 u32 param2; 378 u32 param1; 379 u32 param0; 380 }; 381 382 /* status report ring(srr), currently one srr is supported for entire system */ 383 struct srr { 384 struct bdc_sr *sr_bds; 385 u16 eqp_index; 386 u16 dqp_index; 387 dma_addr_t dma_addr; 388 }; 389 390 /* EP0 states */ 391 enum bdc_ep0_state { 392 WAIT_FOR_SETUP = 0, 393 WAIT_FOR_DATA_START, 394 WAIT_FOR_DATA_XMIT, 395 WAIT_FOR_STATUS_START, 396 WAIT_FOR_STATUS_XMIT, 397 STATUS_PENDING 398 }; 399 400 /* Link states */ 401 enum bdc_link_state { 402 BDC_LINK_STATE_U0 = 0x00, 403 BDC_LINK_STATE_U3 = 0x03, 404 BDC_LINK_STATE_RX_DET = 0x05, 405 BDC_LINK_STATE_RESUME = 0x0f 406 }; 407 408 /* representation of bdc */ 409 struct bdc { 410 struct usb_gadget gadget; 411 struct usb_gadget_driver *gadget_driver; 412 struct device *dev; 413 /* device lock */ 414 spinlock_t lock; 415 416 /* generic phy */ 417 struct phy **phys; 418 int num_phys; 419 /* num of endpoints for a particular instantiation of IP */ 420 unsigned int num_eps; 421 /* 422 * Array of ep's, it uses the same index covention as bdc hw i.e. 423 * 1 for ep0, 2 for 1out,3 for 1in .... 424 */ 425 struct bdc_ep **bdc_ep_array; 426 void __iomem *regs; 427 struct bdc_scratchpad scratchpad; 428 u32 sp_buff_size; 429 /* current driver supports 1 status ring */ 430 struct srr srr; 431 /* Last received setup packet */ 432 struct usb_ctrlrequest setup_pkt; 433 struct bdc_req ep0_req; 434 struct bdc_req status_req; 435 enum bdc_ep0_state ep0_state; 436 bool delayed_status; 437 bool zlp_needed; 438 bool reinit; 439 bool pullup; 440 /* Bits 0-15 are standard and 16-31 for proprietary information */ 441 u32 devstatus; 442 int irq; 443 void *mem; 444 u32 dev_addr; 445 /* DMA pools */ 446 struct dma_pool *bd_table_pool; 447 u8 test_mode; 448 /* array of callbacks for various status report handlers */ 449 void (*sr_handler[2])(struct bdc *, struct bdc_sr *); 450 /* ep0 callback handlers */ 451 void (*sr_xsf_ep0[3])(struct bdc *, struct bdc_sr *); 452 /* ep0 response buffer for ch9 requests like GET_STATUS and SET_SEL */ 453 unsigned char ep0_response_buff[EP0_RESPONSE_BUFF]; 454 /* 455 * Timer to check if host resumed transfer after bdc sent Func wake 456 * notification packet after a remote wakeup. if not, then resend the 457 * Func Wake packet every 2.5 secs. Refer to USB3 spec section 8.5.6.4 458 */ 459 struct delayed_work func_wake_notify; 460 struct clk *clk; 461 }; 462 463 static inline u32 bdc_readl(void __iomem *base, u32 offset) 464 { 465 return readl(base + offset); 466 } 467 468 static inline void bdc_writel(void __iomem *base, u32 offset, u32 value) 469 { 470 writel(value, base + offset); 471 } 472 473 /* Buffer descriptor list operations */ 474 void bdc_notify_xfr(struct bdc *, u32); 475 void bdc_softconn(struct bdc *); 476 void bdc_softdisconn(struct bdc *); 477 int bdc_run(struct bdc *); 478 int bdc_stop(struct bdc *); 479 int bdc_reset(struct bdc *); 480 int bdc_udc_init(struct bdc *); 481 void bdc_udc_exit(struct bdc *); 482 int bdc_reinit(struct bdc *); 483 484 /* Status report handlers */ 485 /* Upstream port status change sr */ 486 void bdc_sr_uspc(struct bdc *, struct bdc_sr *); 487 /* transfer sr */ 488 void bdc_sr_xsf(struct bdc *, struct bdc_sr *); 489 /* EP0 XSF handlers */ 490 void bdc_xsf_ep0_setup_recv(struct bdc *, struct bdc_sr *); 491 void bdc_xsf_ep0_data_start(struct bdc *, struct bdc_sr *); 492 void bdc_xsf_ep0_status_start(struct bdc *, struct bdc_sr *); 493 494 #endif /* __LINUX_BDC_H__ */ 495