drivers/usb/gadget/udc/net2280.h

   1 /*
   2  * NetChip 2280 high/full speed USB device controller.
   3  * Unlike many such controllers, this one talks PCI.
   4  */
   5
   6 /*
   7  * Copyright (C) 2002 NetChip Technology, Inc. (http://www.netchip.com)
   8  * Copyright (C) 2003 David Brownell
   9  * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  */
  16
  17 #include <linux/usb/net2280.h>
  18 #include <linux/usb/usb338x.h>
  19
  20 /*-------------------------------------------------------------------------*/
  21
  22 #ifdef  __KERNEL__
  23
  24 /* indexed registers [11.10] are accessed indirectly
  25  * caller must own the device lock.
  26  */
  27
  28 static inline u32 get_idx_reg(struct net2280_regs __iomem *regs, u32 index)
  29 {
  30         writel(index, &regs->idxaddr);
  31         /* NOTE:  synchs device/cpu memory views */
  32         return readl(&regs->idxdata);
  33 }
  34
  35 static inline void
  36 set_idx_reg(struct net2280_regs __iomem *regs, u32 index, u32 value)
  37 {
  38         writel(index, &regs->idxaddr);
  39         writel(value, &regs->idxdata);
  40         /* posted, may not be visible yet */
  41 }
  42
  43 #endif  /* __KERNEL__ */
  44
  45 #define PCI_VENDOR_ID_PLX_LEGACY 0x17cc
  46
  47 #define PLX_LEGACY              BIT(0)
  48 #define PLX_2280                BIT(1)
  49 #define PLX_SUPERSPEED          BIT(2)
  50 #define PLX_PCIE                BIT(3)
  51
  52 #define REG_DIAG                0x0
  53 #define     RETRY_COUNTER                                       16
  54 #define     FORCE_PCI_SERR                                      11
  55 #define     FORCE_PCI_INTERRUPT                                 10
  56 #define     FORCE_USB_INTERRUPT                                 9
  57 #define     FORCE_CPU_INTERRUPT                                 8
  58 #define     ILLEGAL_BYTE_ENABLES                                5
  59 #define     FAST_TIMES                                          4
  60 #define     FORCE_RECEIVE_ERROR                                 2
  61 #define     FORCE_TRANSMIT_CRC_ERROR                            0
  62 #define REG_FRAME               0x02    /* from last sof */
  63 #define REG_CHIPREV             0x03    /* in bcd */
  64 #define REG_HS_NAK_RATE         0x0a    /* NAK per N uframes */
  65
  66 #define CHIPREV_1       0x0100
  67 #define CHIPREV_1A      0x0110
  68
  69 /* DEFECT 7374 */
  70 #define DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS         200
  71 #define DEFECT_7374_PROCESSOR_WAIT_TIME             10
  72
  73 /* ep0 max packet size */
  74 #define EP0_SS_MAX_PACKET_SIZE  0x200
  75 #define EP0_HS_MAX_PACKET_SIZE  0x40
  76 #ifdef  __KERNEL__
  77
  78 /*-------------------------------------------------------------------------*/
  79
  80 /* [8.3] for scatter/gather i/o
  81  * use struct net2280_dma_regs bitfields
  82  */
  83 struct net2280_dma {
  84         __le32          dmacount;
  85         __le32          dmaaddr;                /* the buffer */
  86         __le32          dmadesc;                /* next dma descriptor */
  87         __le32          _reserved;
  88 } __aligned(16);
  89
  90 /*-------------------------------------------------------------------------*/
  91
  92 /* DRIVER DATA STRUCTURES and UTILITIES */
  93
  94 struct net2280_ep {
  95         struct usb_ep                           ep;
  96         struct net2280_ep_regs __iomem *cfg;
  97         struct net2280_ep_regs                  __iomem *regs;
  98         struct net2280_dma_regs                 __iomem *dma;
  99         struct net2280_dma                      *dummy;
 100         dma_addr_t                              td_dma; /* of dummy */
 101         struct net2280                          *dev;
 102         unsigned long                           irqs;
 103
 104         /* analogous to a host-side qh */
 105         struct list_head                        queue;
 106         const struct usb_endpoint_descriptor    *desc;
 107         unsigned                                num : 8,
 108                                                 fifo_size : 12,
 109                                                 in_fifo_validate : 1,
 110                                                 out_overflow : 1,
 111                                                 stopped : 1,
 112                                                 wedged : 1,
 113                                                 is_in : 1,
 114                                                 is_iso : 1,
 115                                                 responded : 1;
 116 };
 117
 118 static inline void allow_status(struct net2280_ep *ep)
 119 {
 120         /* ep0 only */
 121         writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) |
 122                 BIT(CLEAR_NAK_OUT_PACKETS) |
 123                 BIT(CLEAR_NAK_OUT_PACKETS_MODE),
 124                 &ep->regs->ep_rsp);
 125         ep->stopped = 1;
 126 }
 127
 128 static inline void allow_status_338x(struct net2280_ep *ep)
 129 {
 130         /*
 131          * Control Status Phase Handshake was set by the chip when the setup
 132          * packet arrived. While set, the chip automatically NAKs the host's
 133          * Status Phase tokens.
 134          */
 135         writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE), &ep->regs->ep_rsp);
 136
 137         ep->stopped = 1;
 138
 139         /* TD 9.9 Halt Endpoint test.  TD 9.22 set feature test. */
 140         ep->responded = 0;
 141 }
 142
 143 struct net2280_request {
 144         struct usb_request              req;
 145         struct net2280_dma              *td;
 146         dma_addr_t                      td_dma;
 147         struct list_head                queue;
 148         unsigned                        mapped : 1,
 149                                         valid : 1;
 150 };
 151
 152 struct net2280 {
 153         /* each pci device provides one gadget, several endpoints */
 154         struct usb_gadget               gadget;
 155         spinlock_t                      lock;
 156         struct net2280_ep               ep[9];
 157         struct usb_gadget_driver        *driver;
 158         unsigned                        enabled : 1,
 159                                         protocol_stall : 1,
 160                                         softconnect : 1,
 161                                         got_irq : 1,
 162                                         region:1,
 163                                         u1_enable:1,
 164                                         u2_enable:1,
 165                                         ltm_enable:1,
 166                                         wakeup_enable:1,
 167                                         addressed_state:1,
 168                                         bug7734_patched:1;
 169         u16                             chiprev;
 170         int enhanced_mode;
 171         int n_ep;
 172         kernel_ulong_t                  quirks;
 173
 174
 175         /* pci state used to access those endpoints */
 176         struct pci_dev                  *pdev;
 177         struct net2280_regs             __iomem *regs;
 178         struct net2280_usb_regs         __iomem *usb;
 179         struct usb338x_usb_ext_regs     __iomem *usb_ext;
 180         struct net2280_pci_regs         __iomem *pci;
 181         struct net2280_dma_regs         __iomem *dma;
 182         struct net2280_dep_regs         __iomem *dep;
 183         struct net2280_ep_regs          __iomem *epregs;
 184         struct usb338x_ll_regs          __iomem *llregs;
 185         struct usb338x_ll_lfps_regs     __iomem *ll_lfps_regs;
 186         struct usb338x_ll_tsn_regs      __iomem *ll_tsn_regs;
 187         struct usb338x_ll_chi_regs      __iomem *ll_chicken_reg;
 188         struct usb338x_pl_regs          __iomem *plregs;
 189
 190         struct pci_pool                 *requests;
 191         /* statistics...*/
 192 };
 193
 194 static inline void set_halt(struct net2280_ep *ep)
 195 {
 196         /* ep0 and bulk/intr endpoints */
 197         writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) |
 198                 /* set NAK_OUT for erratum 0114 */
 199                 ((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS) |
 200                 BIT(SET_ENDPOINT_HALT),
 201                 &ep->regs->ep_rsp);
 202 }
 203
 204 static inline void clear_halt(struct net2280_ep *ep)
 205 {
 206         /* ep0 and bulk/intr endpoints */
 207         writel(BIT(CLEAR_ENDPOINT_HALT) |
 208                 BIT(CLEAR_ENDPOINT_TOGGLE) |
 209                     /*
 210                      * unless the gadget driver left a short packet in the
 211                      * fifo, this reverses the erratum 0114 workaround.
 212                      */
 213                 ((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS),
 214                 &ep->regs->ep_rsp);
 215 }
 216
 217 /*
 218  * FSM value for Defect 7374 (U1U2 Test) is managed in
 219  * chip's SCRATCH register:
 220  */
 221 #define DEFECT7374_FSM_FIELD    28
 222
 223 /* Waiting for Control Read:
 224  *  - A transition to this state indicates a fresh USB connection,
 225  *    before the first Setup Packet. The connection speed is not
 226  *    known. Firmware is waiting for the first Control Read.
 227  *  - Starting state: This state can be thought of as the FSM's typical
 228  *    starting state.
 229  *  - Tip: Upon the first SS Control Read the FSM never
 230  *    returns to this state.
 231  */
 232 #define DEFECT7374_FSM_WAITING_FOR_CONTROL_READ BIT(DEFECT7374_FSM_FIELD)
 233
 234 /* Non-SS Control Read:
 235  *  - A transition to this state indicates detection of the first HS
 236  *    or FS Control Read.
 237  *  - Tip: Upon the first SS Control Read the FSM never
 238  *    returns to this state.
 239  */
 240 #define DEFECT7374_FSM_NON_SS_CONTROL_READ (2 << DEFECT7374_FSM_FIELD)
 241
 242 /* SS Control Read:
 243  *  - A transition to this state indicates detection of the
 244  *    first SS Control Read.
 245  *  - This state indicates workaround completion. Workarounds no longer
 246  *    need to be applied (as long as the chip remains powered up).
 247  *  - Tip: Once in this state the FSM state does not change (until
 248  *    the chip's power is lost and restored).
 249  *  - This can be thought of as the final state of the FSM;
 250  *    the FSM 'locks-up' in this state until the chip loses power.
 251  */
 252 #define DEFECT7374_FSM_SS_CONTROL_READ (3 << DEFECT7374_FSM_FIELD)
 253
 254 #ifdef USE_RDK_LEDS
 255
 256 static inline void net2280_led_init(struct net2280 *dev)
 257 {
 258         /* LED3 (green) is on during USB activity. note erratum 0113. */
 259         writel(BIT(GPIO3_LED_SELECT) |
 260                 BIT(GPIO3_OUTPUT_ENABLE) |
 261                 BIT(GPIO2_OUTPUT_ENABLE) |
 262                 BIT(GPIO1_OUTPUT_ENABLE) |
 263                 BIT(GPIO0_OUTPUT_ENABLE),
 264                 &dev->regs->gpioctl);
 265 }
 266
 267 /* indicate speed with bi-color LED 0/1 */
 268 static inline
 269 void net2280_led_speed(struct net2280 *dev, enum usb_device_speed speed)
 270 {
 271         u32     val = readl(&dev->regs->gpioctl);
 272         switch (speed) {
 273         case USB_SPEED_SUPER:           /* green + red */
 274                 val |= BIT(GPIO0_DATA) | BIT(GPIO1_DATA);
 275                 break;
 276         case USB_SPEED_HIGH:            /* green */
 277                 val &= ~BIT(GPIO0_DATA);
 278                 val |= BIT(GPIO1_DATA);
 279                 break;
 280         case USB_SPEED_FULL:            /* red */
 281                 val &= ~BIT(GPIO1_DATA);
 282                 val |= BIT(GPIO0_DATA);
 283                 break;
 284         default:                        /* (off/black) */
 285                 val &= ~(BIT(GPIO1_DATA) | BIT(GPIO0_DATA));
 286                 break;
 287         }
 288         writel(val, &dev->regs->gpioctl);
 289 }
 290
 291 /* indicate power with LED 2 */
 292 static inline void net2280_led_active(struct net2280 *dev, int is_active)
 293 {
 294         u32     val = readl(&dev->regs->gpioctl);
 295
 296         /* FIXME this LED never seems to turn on.*/
 297         if (is_active)
 298                 val |= GPIO2_DATA;
 299         else
 300                 val &= ~GPIO2_DATA;
 301         writel(val, &dev->regs->gpioctl);
 302 }
 303
 304 static inline void net2280_led_shutdown(struct net2280 *dev)
 305 {
 306         /* turn off all four GPIO*_DATA bits */
 307         writel(readl(&dev->regs->gpioctl) & ~0x0f,
 308                         &dev->regs->gpioctl);
 309 }
 310
 311 #else
 312
 313 #define net2280_led_init(dev)           do { } while (0)
 314 #define net2280_led_speed(dev, speed)   do { } while (0)
 315 #define net2280_led_shutdown(dev)       do { } while (0)
 316
 317 #endif
 318
 319 /*-------------------------------------------------------------------------*/
 320
 321 #define ep_dbg(ndev, fmt, args...) \
 322         dev_dbg((&((ndev)->pdev->dev)), fmt, ##args)
 323
 324 #define ep_vdbg(ndev, fmt, args...) \
 325         dev_vdbg((&((ndev)->pdev->dev)), fmt, ##args)
 326
 327 #define ep_info(ndev, fmt, args...) \
 328         dev_info((&((ndev)->pdev->dev)), fmt, ##args)
 329
 330 #define ep_warn(ndev, fmt, args...) \
 331         dev_warn((&((ndev)->pdev->dev)), fmt, ##args)
 332
 333 #define ep_err(ndev, fmt, args...) \
 334         dev_err((&((ndev)->pdev->dev)), fmt, ##args)
 335
 336 /*-------------------------------------------------------------------------*/
 337
 338 static inline void set_fifo_bytecount(struct net2280_ep *ep, unsigned count)
 339 {
 340         if (ep->dev->pdev->vendor == 0x17cc)
 341                 writeb(count, 2 + (u8 __iomem *) &ep->regs->ep_cfg);
 342         else{
 343                 u32 tmp = readl(&ep->cfg->ep_cfg) &
 344                                         (~(0x07 << EP_FIFO_BYTE_COUNT));
 345                 writel(tmp | (count << EP_FIFO_BYTE_COUNT), &ep->cfg->ep_cfg);
 346         }
 347 }
 348
 349 static inline void start_out_naking(struct net2280_ep *ep)
 350 {
 351         /* NOTE:  hardware races lurk here, and PING protocol issues */
 352         writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 353         /* synch with device */
 354         readl(&ep->regs->ep_rsp);
 355 }
 356
 357 static inline void stop_out_naking(struct net2280_ep *ep)
 358 {
 359         u32     tmp;
 360
 361         tmp = readl(&ep->regs->ep_stat);
 362         if ((tmp & BIT(NAK_OUT_PACKETS)) != 0)
 363                 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
 364 }
 365
 366
 367 static inline void set_max_speed(struct net2280_ep *ep, u32 max)
 368 {
 369         u32 reg;
 370         static const u32 ep_enhanced[9] = { 0x10, 0x60, 0x30, 0x80,
 371                                           0x50, 0x20, 0x70, 0x40, 0x90 };
 372
 373         if (ep->dev->enhanced_mode) {
 374                 reg = ep_enhanced[ep->num];
 375                 switch (ep->dev->gadget.speed) {
 376                 case USB_SPEED_SUPER:
 377                         reg += 2;
 378                         break;
 379                 case USB_SPEED_FULL:
 380                         reg += 1;
 381                         break;
 382                 case USB_SPEED_HIGH:
 383                 default:
 384                         break;
 385                 }
 386         } else {
 387                 reg = (ep->num + 1) * 0x10;
 388                 if (ep->dev->gadget.speed != USB_SPEED_HIGH)
 389                         reg += 1;
 390         }
 391
 392         set_idx_reg(ep->dev->regs, reg, max);
 393 }
 394
 395 #endif  /* __KERNEL__ */