1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * NetChip 2280 high/full speed USB device controller. 4 * Unlike many such controllers, this one talks PCI. 5 */ 6 7 /* 8 * Copyright (C) 2002 NetChip Technology, Inc. (http://www.netchip.com) 9 * Copyright (C) 2003 David Brownell 10 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS 11 */ 12 13 #include <linux/usb/net2280.h> 14 #include <linux/usb/usb338x.h> 15 16 /*-------------------------------------------------------------------------*/ 17 18 #ifdef __KERNEL__ 19 20 /* indexed registers [11.10] are accessed indirectly 21 * caller must own the device lock. 22 */ 23 24 static inline u32 get_idx_reg(struct net2280_regs __iomem *regs, u32 index) 25 { 26 writel(index, ®s->idxaddr); 27 /* NOTE: synchs device/cpu memory views */ 28 return readl(®s->idxdata); 29 } 30 31 static inline void 32 set_idx_reg(struct net2280_regs __iomem *regs, u32 index, u32 value) 33 { 34 writel(index, ®s->idxaddr); 35 writel(value, ®s->idxdata); 36 /* posted, may not be visible yet */ 37 } 38 39 #endif /* __KERNEL__ */ 40 41 #define PCI_VENDOR_ID_PLX_LEGACY 0x17cc 42 43 #define PLX_LEGACY BIT(0) 44 #define PLX_2280 BIT(1) 45 #define PLX_SUPERSPEED BIT(2) 46 #define PLX_PCIE BIT(3) 47 48 #define REG_DIAG 0x0 49 #define RETRY_COUNTER 16 50 #define FORCE_PCI_SERR 11 51 #define FORCE_PCI_INTERRUPT 10 52 #define FORCE_USB_INTERRUPT 9 53 #define FORCE_CPU_INTERRUPT 8 54 #define ILLEGAL_BYTE_ENABLES 5 55 #define FAST_TIMES 4 56 #define FORCE_RECEIVE_ERROR 2 57 #define FORCE_TRANSMIT_CRC_ERROR 0 58 #define REG_FRAME 0x02 /* from last sof */ 59 #define REG_CHIPREV 0x03 /* in bcd */ 60 #define REG_HS_NAK_RATE 0x0a /* NAK per N uframes */ 61 62 #define CHIPREV_1 0x0100 63 #define CHIPREV_1A 0x0110 64 65 /* DEFECT 7374 */ 66 #define DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS 200 67 #define DEFECT_7374_PROCESSOR_WAIT_TIME 10 68 69 /* ep0 max packet size */ 70 #define EP0_SS_MAX_PACKET_SIZE 0x200 71 #define EP0_HS_MAX_PACKET_SIZE 0x40 72 #ifdef __KERNEL__ 73 74 /*-------------------------------------------------------------------------*/ 75 76 /* [8.3] for scatter/gather i/o 77 * use struct net2280_dma_regs bitfields 78 */ 79 struct net2280_dma { 80 __le32 dmacount; 81 __le32 dmaaddr; /* the buffer */ 82 __le32 dmadesc; /* next dma descriptor */ 83 __le32 _reserved; 84 } __aligned(16); 85 86 /*-------------------------------------------------------------------------*/ 87 88 /* DRIVER DATA STRUCTURES and UTILITIES */ 89 90 struct net2280_ep { 91 struct usb_ep ep; 92 struct net2280_ep_regs __iomem *cfg; 93 struct net2280_ep_regs __iomem *regs; 94 struct net2280_dma_regs __iomem *dma; 95 struct net2280_dma *dummy; 96 dma_addr_t td_dma; /* of dummy */ 97 struct net2280 *dev; 98 unsigned long irqs; 99 100 /* analogous to a host-side qh */ 101 struct list_head queue; 102 const struct usb_endpoint_descriptor *desc; 103 unsigned num : 8, 104 fifo_size : 12, 105 in_fifo_validate : 1, 106 out_overflow : 1, 107 stopped : 1, 108 wedged : 1, 109 is_in : 1, 110 is_iso : 1, 111 responded : 1; 112 }; 113 114 static inline void allow_status(struct net2280_ep *ep) 115 { 116 /* ep0 only */ 117 writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) | 118 BIT(CLEAR_NAK_OUT_PACKETS) | 119 BIT(CLEAR_NAK_OUT_PACKETS_MODE), 120 &ep->regs->ep_rsp); 121 ep->stopped = 1; 122 } 123 124 static inline void allow_status_338x(struct net2280_ep *ep) 125 { 126 /* 127 * Control Status Phase Handshake was set by the chip when the setup 128 * packet arrived. While set, the chip automatically NAKs the host's 129 * Status Phase tokens. 130 */ 131 writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE), &ep->regs->ep_rsp); 132 133 ep->stopped = 1; 134 135 /* TD 9.9 Halt Endpoint test. TD 9.22 set feature test. */ 136 ep->responded = 0; 137 } 138 139 struct net2280_request { 140 struct usb_request req; 141 struct net2280_dma *td; 142 dma_addr_t td_dma; 143 struct list_head queue; 144 unsigned mapped : 1, 145 valid : 1; 146 }; 147 148 struct net2280 { 149 /* each pci device provides one gadget, several endpoints */ 150 struct usb_gadget gadget; 151 spinlock_t lock; 152 struct net2280_ep ep[9]; 153 struct usb_gadget_driver *driver; 154 unsigned enabled : 1, 155 protocol_stall : 1, 156 softconnect : 1, 157 got_irq : 1, 158 region:1, 159 added:1, 160 u1_enable:1, 161 u2_enable:1, 162 ltm_enable:1, 163 wakeup_enable:1, 164 addressed_state:1, 165 bug7734_patched:1; 166 u16 chiprev; 167 int enhanced_mode; 168 int n_ep; 169 kernel_ulong_t quirks; 170 171 172 /* pci state used to access those endpoints */ 173 struct pci_dev *pdev; 174 struct net2280_regs __iomem *regs; 175 struct net2280_usb_regs __iomem *usb; 176 struct usb338x_usb_ext_regs __iomem *usb_ext; 177 struct net2280_pci_regs __iomem *pci; 178 struct net2280_dma_regs __iomem *dma; 179 struct net2280_dep_regs __iomem *dep; 180 struct net2280_ep_regs __iomem *epregs; 181 struct usb338x_ll_regs __iomem *llregs; 182 struct usb338x_pl_regs __iomem *plregs; 183 184 struct dma_pool *requests; 185 /* statistics...*/ 186 }; 187 188 static inline void set_halt(struct net2280_ep *ep) 189 { 190 /* ep0 and bulk/intr endpoints */ 191 writel(BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE) | 192 /* set NAK_OUT for erratum 0114 */ 193 ((ep->dev->chiprev == CHIPREV_1) << SET_NAK_OUT_PACKETS) | 194 BIT(SET_ENDPOINT_HALT), 195 &ep->regs->ep_rsp); 196 } 197 198 static inline void clear_halt(struct net2280_ep *ep) 199 { 200 /* ep0 and bulk/intr endpoints */ 201 writel(BIT(CLEAR_ENDPOINT_HALT) | 202 BIT(CLEAR_ENDPOINT_TOGGLE) | 203 /* 204 * unless the gadget driver left a short packet in the 205 * fifo, this reverses the erratum 0114 workaround. 206 */ 207 ((ep->dev->chiprev == CHIPREV_1) << CLEAR_NAK_OUT_PACKETS), 208 &ep->regs->ep_rsp); 209 } 210 211 /* 212 * FSM value for Defect 7374 (U1U2 Test) is managed in 213 * chip's SCRATCH register: 214 */ 215 #define DEFECT7374_FSM_FIELD 28 216 217 /* Waiting for Control Read: 218 * - A transition to this state indicates a fresh USB connection, 219 * before the first Setup Packet. The connection speed is not 220 * known. Firmware is waiting for the first Control Read. 221 * - Starting state: This state can be thought of as the FSM's typical 222 * starting state. 223 * - Tip: Upon the first SS Control Read the FSM never 224 * returns to this state. 225 */ 226 #define DEFECT7374_FSM_WAITING_FOR_CONTROL_READ BIT(DEFECT7374_FSM_FIELD) 227 228 /* Non-SS Control Read: 229 * - A transition to this state indicates detection of the first HS 230 * or FS Control Read. 231 * - Tip: Upon the first SS Control Read the FSM never 232 * returns to this state. 233 */ 234 #define DEFECT7374_FSM_NON_SS_CONTROL_READ (2 << DEFECT7374_FSM_FIELD) 235 236 /* SS Control Read: 237 * - A transition to this state indicates detection of the 238 * first SS Control Read. 239 * - This state indicates workaround completion. Workarounds no longer 240 * need to be applied (as long as the chip remains powered up). 241 * - Tip: Once in this state the FSM state does not change (until 242 * the chip's power is lost and restored). 243 * - This can be thought of as the final state of the FSM; 244 * the FSM 'locks-up' in this state until the chip loses power. 245 */ 246 #define DEFECT7374_FSM_SS_CONTROL_READ (3 << DEFECT7374_FSM_FIELD) 247 248 #ifdef USE_RDK_LEDS 249 250 static inline void net2280_led_init(struct net2280 *dev) 251 { 252 /* LED3 (green) is on during USB activity. note erratum 0113. */ 253 writel(BIT(GPIO3_LED_SELECT) | 254 BIT(GPIO3_OUTPUT_ENABLE) | 255 BIT(GPIO2_OUTPUT_ENABLE) | 256 BIT(GPIO1_OUTPUT_ENABLE) | 257 BIT(GPIO0_OUTPUT_ENABLE), 258 &dev->regs->gpioctl); 259 } 260 261 /* indicate speed with bi-color LED 0/1 */ 262 static inline 263 void net2280_led_speed(struct net2280 *dev, enum usb_device_speed speed) 264 { 265 u32 val = readl(&dev->regs->gpioctl); 266 switch (speed) { 267 case USB_SPEED_SUPER: /* green + red */ 268 val |= BIT(GPIO0_DATA) | BIT(GPIO1_DATA); 269 break; 270 case USB_SPEED_HIGH: /* green */ 271 val &= ~BIT(GPIO0_DATA); 272 val |= BIT(GPIO1_DATA); 273 break; 274 case USB_SPEED_FULL: /* red */ 275 val &= ~BIT(GPIO1_DATA); 276 val |= BIT(GPIO0_DATA); 277 break; 278 default: /* (off/black) */ 279 val &= ~(BIT(GPIO1_DATA) | BIT(GPIO0_DATA)); 280 break; 281 } 282 writel(val, &dev->regs->gpioctl); 283 } 284 285 /* indicate power with LED 2 */ 286 static inline void net2280_led_active(struct net2280 *dev, int is_active) 287 { 288 u32 val = readl(&dev->regs->gpioctl); 289 290 /* FIXME this LED never seems to turn on.*/ 291 if (is_active) 292 val |= GPIO2_DATA; 293 else 294 val &= ~GPIO2_DATA; 295 writel(val, &dev->regs->gpioctl); 296 } 297 298 static inline void net2280_led_shutdown(struct net2280 *dev) 299 { 300 /* turn off all four GPIO*_DATA bits */ 301 writel(readl(&dev->regs->gpioctl) & ~0x0f, 302 &dev->regs->gpioctl); 303 } 304 305 #else 306 307 #define net2280_led_init(dev) do { } while (0) 308 #define net2280_led_speed(dev, speed) do { } while (0) 309 #define net2280_led_shutdown(dev) do { } while (0) 310 311 #endif 312 313 /*-------------------------------------------------------------------------*/ 314 315 #define ep_dbg(ndev, fmt, args...) \ 316 dev_dbg((&((ndev)->pdev->dev)), fmt, ##args) 317 318 #define ep_vdbg(ndev, fmt, args...) \ 319 dev_vdbg((&((ndev)->pdev->dev)), fmt, ##args) 320 321 #define ep_info(ndev, fmt, args...) \ 322 dev_info((&((ndev)->pdev->dev)), fmt, ##args) 323 324 #define ep_warn(ndev, fmt, args...) \ 325 dev_warn((&((ndev)->pdev->dev)), fmt, ##args) 326 327 #define ep_err(ndev, fmt, args...) \ 328 dev_err((&((ndev)->pdev->dev)), fmt, ##args) 329 330 /*-------------------------------------------------------------------------*/ 331 332 static inline void set_fifo_bytecount(struct net2280_ep *ep, unsigned count) 333 { 334 if (ep->dev->pdev->vendor == 0x17cc) 335 writeb(count, 2 + (u8 __iomem *) &ep->regs->ep_cfg); 336 else{ 337 u32 tmp = readl(&ep->cfg->ep_cfg) & 338 (~(0x07 << EP_FIFO_BYTE_COUNT)); 339 writel(tmp | (count << EP_FIFO_BYTE_COUNT), &ep->cfg->ep_cfg); 340 } 341 } 342 343 static inline void start_out_naking(struct net2280_ep *ep) 344 { 345 /* NOTE: hardware races lurk here, and PING protocol issues */ 346 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp); 347 /* synch with device */ 348 readl(&ep->regs->ep_rsp); 349 } 350 351 static inline void stop_out_naking(struct net2280_ep *ep) 352 { 353 u32 tmp; 354 355 tmp = readl(&ep->regs->ep_stat); 356 if ((tmp & BIT(NAK_OUT_PACKETS)) != 0) 357 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp); 358 } 359 360 361 static inline void set_max_speed(struct net2280_ep *ep, u32 max) 362 { 363 u32 reg; 364 static const u32 ep_enhanced[9] = { 0x10, 0x60, 0x30, 0x80, 365 0x50, 0x20, 0x70, 0x40, 0x90 }; 366 367 if (ep->dev->enhanced_mode) { 368 reg = ep_enhanced[ep->num]; 369 switch (ep->dev->gadget.speed) { 370 case USB_SPEED_SUPER: 371 reg += 2; 372 break; 373 case USB_SPEED_FULL: 374 reg += 1; 375 break; 376 case USB_SPEED_HIGH: 377 default: 378 break; 379 } 380 } else { 381 reg = (ep->num + 1) * 0x10; 382 if (ep->dev->gadget.speed != USB_SPEED_HIGH) 383 reg += 1; 384 } 385 386 set_idx_reg(ep->dev->regs, reg, max); 387 } 388 389 #endif /* __KERNEL__ */ 390