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, ®s->idxaddr); 31 /* NOTE: synchs device/cpu memory views */ 32 return readl(®s->idxdata); 33 } 34 35 static inline void 36 set_idx_reg(struct net2280_regs __iomem *regs, u32 index, u32 value) 37 { 38 writel(index, ®s->idxaddr); 39 writel(value, ®s->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 dma_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__ */ 396