drivers/usb/gadget/udc/bdc/bdc.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * bdc.h - header for the BRCM BDC USB3.0 device controller
   4  *
   5  * Copyright (C) 2014 Broadcom Corporation
   6  *
   7  * Author: Ashwini Pahuja
   8  */
   9
  10 #ifndef __LINUX_BDC_H__
  11 #define __LINUX_BDC_H__
  12
  13 #include <linux/kernel.h>
  14 #include <linux/usb.h>
  15 #include <linux/device.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/list.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/mm.h>
  20 #include <linux/debugfs.h>
  21 #include <linux/usb/ch9.h>
  22 #include <linux/usb/gadget.h>
  23 #include <asm/unaligned.h>
  24
  25 #define BRCM_BDC_NAME "bdc"
  26 #define BRCM_BDC_DESC "Broadcom USB Device Controller driver"
  27
  28 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
  29
  30 /* BDC command operation timeout in usec*/
  31 #define BDC_CMD_TIMEOUT 1000
  32 /* BDC controller operation timeout in usec*/
  33 #define BDC_COP_TIMEOUT 500
  34
  35 /*
  36  * Maximum size of ep0 response buffer for ch9 requests,
  37  * the set_sel request uses 6 so far, the max.
  38 */
  39 #define EP0_RESPONSE_BUFF  6
  40 /* Start with SS as default */
  41 #define EP0_MAX_PKT_SIZE 512
  42
  43 /* 64 entries in a SRR */
  44 #define NUM_SR_ENTRIES  64
  45
  46 /* Num of bds per table */
  47 #define NUM_BDS_PER_TABLE       32
  48
  49 /* Num of tables in bd list for control,bulk and Int ep */
  50 #define NUM_TABLES      2
  51
  52 /* Num of tables in bd list for Isoch ep */
  53 #define NUM_TABLES_ISOCH        6
  54
  55 /* U1 Timeout default: 248usec */
  56 #define U1_TIMEOUT      0xf8
  57
  58 /* Interrupt coalescence in usec */
  59 #define INT_CLS 500
  60
  61 /* Register offsets */
  62 /* Configuration and Capability registers */
  63 #define BDC_BDCCFG0     0x00
  64 #define BDC_BDCCFG1     0x04
  65 #define BDC_BDCCAP0     0x08
  66 #define BDC_BDCCAP1     0x0c
  67 #define BDC_CMDPAR0     0x10
  68 #define BDC_CMDPAR1     0x14
  69 #define BDC_CMDPAR2     0x18
  70 #define BDC_CMDSC       0x1c
  71 #define BDC_USPC        0x20
  72 #define BDC_USPPMS      0x28
  73 #define BDC_USPPM2      0x2c
  74 #define BDC_SPBBAL      0x38
  75 #define BDC_SPBBAH      0x3c
  76 #define BDC_BDCSC       0x40
  77 #define BDC_XSFNTF      0x4c
  78
  79 #define BDC_DVCSA       0x50
  80 #define BDC_DVCSB       0x54
  81 #define BDC_EPSTS0      0x60
  82 #define BDC_EPSTS1      0x64
  83 #define BDC_EPSTS2      0x68
  84 #define BDC_EPSTS3      0x6c
  85 #define BDC_EPSTS4      0x70
  86 #define BDC_EPSTS5      0x74
  87 #define BDC_EPSTS6      0x78
  88 #define BDC_EPSTS7      0x7c
  89 #define BDC_SRRBAL(n)   (0x200 + (n * 0x10))
  90 #define BDC_SRRBAH(n)   (0x204 + (n * 0x10))
  91 #define BDC_SRRINT(n)   (0x208 + (n * 0x10))
  92 #define BDC_INTCTLS(n)  (0x20c + (n * 0x10))
  93
  94 /* Extended capability regs */
  95 #define BDC_FSCNOC      0xcd4
  96 #define BDC_FSCNIC      0xce4
  97 #define NUM_NCS(p)      (p >> 28)
  98
  99 /* Register bit fields and Masks */
 100 /* BDC Configuration 0 */
 101 #define BDC_PGS(p)      (((p) & (0x7 << 8)) >> 8)
 102 #define BDC_SPB(p)      (p & 0x7)
 103
 104 /* BDC Capability1 */
 105 #define BDC_P64         (1 << 0)
 106
 107 /* BDC Command register */
 108 #define BDC_CMD_FH      0xe
 109 #define BDC_CMD_DNC     0x6
 110 #define BDC_CMD_EPO     0x4
 111 #define BDC_CMD_BLA     0x3
 112 #define BDC_CMD_EPC     0x2
 113 #define BDC_CMD_DVC     0x1
 114 #define BDC_CMD_CWS             (0x1 << 5)
 115 #define BDC_CMD_CST(p)          (((p) & (0xf << 6))>>6)
 116 #define BDC_CMD_EPN(p)          ((p & 0x1f) << 10)
 117 #define BDC_SUB_CMD_ADD         (0x1 << 17)
 118 #define BDC_SUB_CMD_FWK         (0x4 << 17)
 119 /* Reset sequence number */
 120 #define BDC_CMD_EPO_RST_SN      (0x1 << 16)
 121 #define BDC_CMD_EP0_XSD         (0x1 << 16)
 122 #define BDC_SUB_CMD_ADD_EP      (0x1 << 17)
 123 #define BDC_SUB_CMD_DRP_EP      (0x2 << 17)
 124 #define BDC_SUB_CMD_EP_STP      (0x2 << 17)
 125 #define BDC_SUB_CMD_EP_STL      (0x4 << 17)
 126 #define BDC_SUB_CMD_EP_RST      (0x1 << 17)
 127 #define BDC_CMD_SRD             (1 << 27)
 128
 129 /* CMD completion status */
 130 #define BDC_CMDS_SUCC   0x1
 131 #define BDC_CMDS_PARA   0x3
 132 #define BDC_CMDS_STAT   0x4
 133 #define BDC_CMDS_FAIL   0x5
 134 #define BDC_CMDS_INTL   0x6
 135 #define BDC_CMDS_BUSY   0xf
 136
 137 /* CMDSC Param 2 shifts */
 138 #define EPT_SHIFT       22
 139 #define MP_SHIFT        10
 140 #define MB_SHIFT        6
 141 #define EPM_SHIFT       4
 142
 143 /* BDC USPSC */
 144 #define BDC_VBC         (1 << 31)
 145 #define BDC_PRC         (1 << 30)
 146 #define BDC_PCE         (1 << 29)
 147 #define BDC_CFC         (1 << 28)
 148 #define BDC_PCC         (1 << 27)
 149 #define BDC_PSC         (1 << 26)
 150 #define BDC_VBS         (1 << 25)
 151 #define BDC_PRS         (1 << 24)
 152 #define BDC_PCS         (1 << 23)
 153 #define BDC_PSP(p)      (((p) & (0x7 << 20))>>20)
 154 #define BDC_SCN         (1 << 8)
 155 #define BDC_SDC         (1 << 7)
 156 #define BDC_SWS         (1 << 4)
 157
 158 #define BDC_USPSC_RW    (BDC_SCN|BDC_SDC|BDC_SWS|0xf)
 159 #define BDC_PSP(p)      (((p) & (0x7 << 20))>>20)
 160
 161 #define BDC_SPEED_FS    0x1
 162 #define BDC_SPEED_LS    0x2
 163 #define BDC_SPEED_HS    0x3
 164 #define BDC_SPEED_SS    0x4
 165
 166 #define BDC_PST(p)      (p & 0xf)
 167 #define BDC_PST_MASK    0xf
 168
 169 /* USPPMS */
 170 #define BDC_U2E         (0x1 << 31)
 171 #define BDC_U1E         (0x1 << 30)
 172 #define BDC_U2A         (0x1 << 29)
 173 #define BDC_PORT_W1S    (0x1 << 17)
 174 #define BDC_U1T(p)      ((p) & 0xff)
 175 #define BDC_U2T(p)      (((p) & 0xff) << 8)
 176 #define BDC_U1T_MASK    0xff
 177
 178 /* USBPM2 */
 179 /* Hardware LPM Enable */
 180 #define BDC_HLE         (1 << 16)
 181
 182 /* BDC Status and Control */
 183 #define BDC_COP_RST     (1 << 29)
 184 #define BDC_COP_RUN     (2 << 29)
 185 #define BDC_COP_STP     (4 << 29)
 186
 187 #define BDC_COP_MASK (BDC_COP_RST|BDC_COP_RUN|BDC_COP_STP)
 188
 189 #define BDC_COS         (1 << 28)
 190 #define BDC_CSTS(p)     (((p) & (0x7 << 20)) >> 20)
 191 #define BDC_MASK_MCW    (1 << 7)
 192 #define BDC_GIE         (1 << 1)
 193 #define BDC_GIP         (1 << 0)
 194
 195 #define BDC_HLT 1
 196 #define BDC_NOR 2
 197 #define BDC_OIP 7
 198
 199 /* Buffer descriptor and Status report bit fields and masks */
 200 #define BD_TYPE_BITMASK (0xf)
 201 #define BD_CHAIN        0xf
 202
 203 #define BD_TFS_SHIFT    4
 204 #define BD_SOT          (1 << 26)
 205 #define BD_EOT          (1 << 27)
 206 #define BD_ISP          (1 << 29)
 207 #define BD_IOC          (1 << 30)
 208 #define BD_SBF          (1 << 31)
 209
 210 #define BD_INTR_TARGET(p)       (((p) & 0x1f) << 27)
 211
 212 #define BDC_SRR_RWS             (1 << 4)
 213 #define BDC_SRR_RST             (1 << 3)
 214 #define BDC_SRR_ISR             (1 << 2)
 215 #define BDC_SRR_IE              (1 << 1)
 216 #define BDC_SRR_IP              (1 << 0)
 217 #define BDC_SRR_EPI(p)  (((p) & (0xff << 24)) >> 24)
 218 #define BDC_SRR_DPI(p) (((p) & (0xff << 16)) >> 16)
 219 #define BDC_SRR_DPI_MASK        0x00ff0000
 220
 221 #define MARK_CHAIN_BD   (BD_CHAIN|BD_EOT|BD_SOT)
 222
 223 /* Control transfer BD specific fields */
 224 #define BD_DIR_IN               (1 << 25)
 225
 226 #define BDC_PTC_MASK    0xf0000000
 227
 228 /* status report defines */
 229 #define SR_XSF          0
 230 #define SR_USPC         4
 231 #define SR_BD_LEN(p)    (p & 0xffffff)
 232
 233 #define XSF_SUCC        0x1
 234 #define XSF_SHORT       0x3
 235 #define XSF_BABB        0x4
 236 #define XSF_SETUP_RECV  0x6
 237 #define XSF_DATA_START  0x7
 238 #define XSF_STATUS_START 0x8
 239
 240 #define XSF_STS(p) (((p) >> 28) & 0xf)
 241
 242 /* Transfer BD fields */
 243 #define BD_LEN(p) ((p) & 0x1ffff)
 244 #define BD_LTF          (1 << 25)
 245 #define BD_TYPE_DS      0x1
 246 #define BD_TYPE_SS      0x2
 247
 248 #define BDC_EP_ENABLED     (1 << 0)
 249 #define BDC_EP_STALL       (1 << 1)
 250 #define BDC_EP_STOP        (1 << 2)
 251
 252 /* One BD can transfer max 65536 bytes */
 253 #define BD_MAX_BUFF_SIZE        (1 << 16)
 254 /* Maximum bytes in one XFR, Refer to BDC spec */
 255 #define MAX_XFR_LEN             16777215
 256
 257 /* defines for Force Header command */
 258 #define DEV_NOTF_TYPE 6
 259 #define FWK_SUBTYPE  1
 260 #define TRA_PACKET   4
 261
 262 #define to_bdc_ep(e)            container_of(e, struct bdc_ep, usb_ep)
 263 #define to_bdc_req(r)           container_of(r, struct bdc_req, usb_req)
 264 #define gadget_to_bdc(g)        container_of(g, struct bdc, gadget)
 265
 266 /* FUNCTION WAKE DEV NOTIFICATION interval, USB3 spec table 8.13 */
 267 #define BDC_TNOTIFY 2500 /*in ms*/
 268 /* Devstatus bitfields */
 269 #define REMOTE_WAKEUP_ISSUED    (1 << 16)
 270 #define DEVICE_SUSPENDED        (1 << 17)
 271 #define FUNC_WAKE_ISSUED        (1 << 18)
 272 #define REMOTE_WAKE_ENABLE      (1 << USB_DEVICE_REMOTE_WAKEUP)
 273
 274 /* On disconnect, preserve these bits and clear rest */
 275 #define DEVSTATUS_CLEAR         (1 << USB_DEVICE_SELF_POWERED)
 276 /* Hardware and software Data structures */
 277
 278 /* Endpoint bd: buffer descriptor */
 279 struct bdc_bd {
 280         __le32 offset[4];
 281 };
 282
 283 /* Status report in Status report ring(srr) */
 284 struct bdc_sr {
 285         __le32 offset[4];
 286 };
 287
 288 /* bd_table: contiguous bd's in a table */
 289 struct bd_table {
 290         struct bdc_bd *start_bd;
 291         /* dma address of start bd of table*/
 292         dma_addr_t dma;
 293 };
 294
 295 /*
 296  * Each endpoint has a bdl(buffer descriptor list), bdl consists of 1 or more bd
 297  * table's chained to each other through a chain bd, every table has equal
 298  * number of bds. the software uses bdi(bd index) to refer to particular bd in
 299  * the list.
 300  */
 301 struct bd_list {
 302         /* Array of bd table pointers*/
 303         struct bd_table **bd_table_array;
 304         /* How many tables chained to each other */
 305         int num_tabs;
 306         /* Max_bdi = num_tabs * num_bds_table - 1 */
 307         int max_bdi;
 308         /* current enq bdi from sw point of view */
 309         int eqp_bdi;
 310         /* current deq bdi from sw point of view */
 311         int hwd_bdi;
 312         /* numbers of bds per table */
 313         int num_bds_table;
 314 };
 315
 316 struct bdc_req;
 317
 318 /* Representation of a transfer, one transfer can have multiple bd's */
 319 struct bd_transfer {
 320         struct bdc_req *req;
 321         /* start bd index */
 322         int start_bdi;
 323         /* this will be the next hw dqp when this transfer completes */
 324         int next_hwd_bdi;
 325         /* number of bds in this transfer */
 326         int num_bds;
 327 };
 328
 329 /*
 330  * Representation of a gadget request, every gadget request is contained
 331  * by 1 bd_transfer.
 332  */
 333 struct bdc_req {
 334         struct usb_request      usb_req;
 335         struct list_head        queue;
 336         struct bdc_ep           *ep;
 337         /* only one Transfer per request */
 338         struct bd_transfer bd_xfr;
 339         int     epnum;
 340 };
 341
 342 /* scratchpad buffer needed by bdc hardware */
 343 struct bdc_scratchpad {
 344         dma_addr_t sp_dma;
 345         void *buff;
 346         u32 size;
 347 };
 348
 349 /* endpoint representation */
 350 struct bdc_ep {
 351         struct usb_ep   usb_ep;
 352         struct list_head queue;
 353         struct bdc *bdc;
 354         u8  ep_type;
 355         u8  dir;
 356         u8  ep_num;
 357         const struct usb_ss_ep_comp_descriptor  *comp_desc;
 358         const struct usb_endpoint_descriptor    *desc;
 359         unsigned int flags;
 360         char name[20];
 361         /* endpoint bd list*/
 362         struct bd_list bd_list;
 363         /*
 364          * HW generates extra event for multi bd tranfers, this flag helps in
 365          * ignoring the extra event
 366          */
 367         bool ignore_next_sr;
 368 };
 369
 370 /* bdc cmmand parameter structure */
 371 struct bdc_cmd_params {
 372         u32     param2;
 373         u32     param1;
 374         u32     param0;
 375 };
 376
 377 /* status report ring(srr), currently one srr is supported for entire system */
 378 struct srr {
 379         struct bdc_sr *sr_bds;
 380         u16     eqp_index;
 381         u16     dqp_index;
 382         dma_addr_t      dma_addr;
 383 };
 384
 385 /* EP0 states */
 386 enum bdc_ep0_state {
 387         WAIT_FOR_SETUP = 0,
 388         WAIT_FOR_DATA_START,
 389         WAIT_FOR_DATA_XMIT,
 390         WAIT_FOR_STATUS_START,
 391         WAIT_FOR_STATUS_XMIT,
 392         STATUS_PENDING
 393 };
 394
 395 /* Link states */
 396 enum bdc_link_state {
 397         BDC_LINK_STATE_U0       = 0x00,
 398         BDC_LINK_STATE_U3       = 0x03,
 399         BDC_LINK_STATE_RX_DET   = 0x05,
 400         BDC_LINK_STATE_RESUME   = 0x0f
 401 };
 402
 403 /* representation of bdc */
 404 struct bdc {
 405         struct usb_gadget       gadget;
 406         struct usb_gadget_driver        *gadget_driver;
 407         struct device   *dev;
 408         /* device lock */
 409         spinlock_t      lock;
 410
 411         /* generic phy */
 412         struct phy      **phys;
 413         int num_phys;
 414         /* num of endpoints for a particular instantiation of IP */
 415         unsigned int num_eps;
 416         /*
 417          * Array of ep's, it uses the same index covention as bdc hw i.e.
 418          * 1 for ep0, 2 for 1out,3 for 1in ....
 419          */
 420         struct bdc_ep           **bdc_ep_array;
 421         void __iomem            *regs;
 422         struct bdc_scratchpad   scratchpad;
 423         u32     sp_buff_size;
 424         /* current driver supports 1 status ring */
 425         struct srr      srr;
 426         /* Last received setup packet */
 427         struct  usb_ctrlrequest setup_pkt;
 428         struct  bdc_req ep0_req;
 429         struct  bdc_req status_req;
 430         enum    bdc_ep0_state ep0_state;
 431         bool    delayed_status;
 432         bool    zlp_needed;
 433         bool    reinit;
 434         bool    pullup;
 435         /* Bits 0-15 are standard and 16-31 for proprietary information */
 436         u32     devstatus;
 437         int     irq;
 438         void    *mem;
 439         u32     dev_addr;
 440         /* DMA pools */
 441         struct dma_pool *bd_table_pool;
 442         u8              test_mode;
 443         /* array of callbacks for various status report handlers */
 444         void (*sr_handler[2])(struct bdc *, struct bdc_sr *);
 445         /* ep0 callback handlers */
 446         void (*sr_xsf_ep0[3])(struct bdc *, struct bdc_sr *);
 447         /* ep0 response buffer for ch9 requests like GET_STATUS and SET_SEL */
 448         unsigned char           ep0_response_buff[EP0_RESPONSE_BUFF];
 449         /*
 450          * Timer to check if host resumed transfer after bdc sent Func wake
 451          * notification  packet after a remote wakeup. if not, then resend the
 452          * Func Wake packet every 2.5 secs. Refer to USB3 spec section 8.5.6.4
 453          */
 454         struct delayed_work     func_wake_notify;
 455         struct clk              *clk;
 456 };
 457
 458 static inline u32 bdc_readl(void __iomem *base, u32 offset)
 459 {
 460         return readl(base + offset);
 461 }
 462
 463 static inline void bdc_writel(void __iomem *base, u32 offset, u32 value)
 464 {
 465         writel(value, base + offset);
 466 }
 467
 468 /* Buffer descriptor list operations */
 469 void bdc_notify_xfr(struct bdc *, u32);
 470 void bdc_softconn(struct bdc *);
 471 void bdc_softdisconn(struct bdc *);
 472 int bdc_run(struct bdc *);
 473 int bdc_stop(struct bdc *);
 474 int bdc_reset(struct bdc *);
 475 int bdc_udc_init(struct bdc *);
 476 void bdc_udc_exit(struct bdc *);
 477 int bdc_reinit(struct bdc *);
 478
 479 /* Status report handlers */
 480 /* Upstream port status change sr */
 481 void bdc_sr_uspc(struct bdc *, struct bdc_sr *);
 482 /* transfer sr */
 483 void bdc_sr_xsf(struct bdc *, struct bdc_sr *);
 484 /* EP0 XSF handlers */
 485 void bdc_xsf_ep0_setup_recv(struct bdc *, struct bdc_sr *);
 486 void bdc_xsf_ep0_data_start(struct bdc *, struct bdc_sr *);
 487 void bdc_xsf_ep0_status_start(struct bdc *, struct bdc_sr *);
 488
 489 #endif /* __LINUX_BDC_H__ */