1 /* 2 * Support for ColdFire CPU based boards using a NS8390 Ethernet device. 3 * 4 * Derived from the many other 8390 drivers. 5 * 6 * (C) Copyright 2012, Greg Ungerer <gerg@uclinux.org> 7 * 8 * This file is subject to the terms and conditions of the GNU General Public 9 * License. See the file COPYING in the main directory of the Linux 10 * distribution for more details. 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/errno.h> 16 #include <linux/platform_device.h> 17 #include <linux/netdevice.h> 18 #include <linux/etherdevice.h> 19 #include <linux/jiffies.h> 20 #include <linux/io.h> 21 #include <asm/mcf8390.h> 22 23 static const char version[] = 24 "mcf8390.c: (15-06-2012) Greg Ungerer <gerg@uclinux.org>"; 25 26 #define NE_CMD 0x00 27 #define NE_DATAPORT 0x10 /* NatSemi-defined port window offset */ 28 #define NE_RESET 0x1f /* Issue a read to reset ,a write to clear */ 29 #define NE_EN0_ISR 0x07 30 #define NE_EN0_DCFG 0x0e 31 #define NE_EN0_RSARLO 0x08 32 #define NE_EN0_RSARHI 0x09 33 #define NE_EN0_RCNTLO 0x0a 34 #define NE_EN0_RXCR 0x0c 35 #define NE_EN0_TXCR 0x0d 36 #define NE_EN0_RCNTHI 0x0b 37 #define NE_EN0_IMR 0x0f 38 39 #define NESM_START_PG 0x40 /* First page of TX buffer */ 40 #define NESM_STOP_PG 0x80 /* Last page +1 of RX ring */ 41 42 #ifdef NE2000_ODDOFFSET 43 /* 44 * A lot of the ColdFire boards use a separate address region for odd offset 45 * register addresses. The following functions convert and map as required. 46 * Note that the data port accesses are treated a little differently, and 47 * always accessed via the insX/outsX functions. 48 */ 49 static inline u32 NE_PTR(u32 addr) 50 { 51 if (addr & 1) 52 return addr - 1 + NE2000_ODDOFFSET; 53 return addr; 54 } 55 56 static inline u32 NE_DATA_PTR(u32 addr) 57 { 58 return addr; 59 } 60 61 void ei_outb(u32 val, u32 addr) 62 { 63 NE2000_BYTE *rp; 64 65 rp = (NE2000_BYTE *) NE_PTR(addr); 66 *rp = RSWAP(val); 67 } 68 69 #define ei_inb ei_inb 70 u8 ei_inb(u32 addr) 71 { 72 NE2000_BYTE *rp, val; 73 74 rp = (NE2000_BYTE *) NE_PTR(addr); 75 val = *rp; 76 return (u8) (RSWAP(val) & 0xff); 77 } 78 79 void ei_insb(u32 addr, void *vbuf, int len) 80 { 81 NE2000_BYTE *rp, val; 82 u8 *buf; 83 84 buf = (u8 *) vbuf; 85 rp = (NE2000_BYTE *) NE_DATA_PTR(addr); 86 for (; (len > 0); len--) { 87 val = *rp; 88 *buf++ = RSWAP(val); 89 } 90 } 91 92 void ei_insw(u32 addr, void *vbuf, int len) 93 { 94 volatile u16 *rp; 95 u16 w, *buf; 96 97 buf = (u16 *) vbuf; 98 rp = (volatile u16 *) NE_DATA_PTR(addr); 99 for (; (len > 0); len--) { 100 w = *rp; 101 *buf++ = BSWAP(w); 102 } 103 } 104 105 void ei_outsb(u32 addr, const void *vbuf, int len) 106 { 107 NE2000_BYTE *rp, val; 108 u8 *buf; 109 110 buf = (u8 *) vbuf; 111 rp = (NE2000_BYTE *) NE_DATA_PTR(addr); 112 for (; (len > 0); len--) { 113 val = *buf++; 114 *rp = RSWAP(val); 115 } 116 } 117 118 void ei_outsw(u32 addr, const void *vbuf, int len) 119 { 120 volatile u16 *rp; 121 u16 w, *buf; 122 123 buf = (u16 *) vbuf; 124 rp = (volatile u16 *) NE_DATA_PTR(addr); 125 for (; (len > 0); len--) { 126 w = *buf++; 127 *rp = BSWAP(w); 128 } 129 } 130 131 #else /* !NE2000_ODDOFFSET */ 132 133 #define ei_inb inb 134 #define ei_outb outb 135 #define ei_insb insb 136 #define ei_insw insw 137 #define ei_outsb outsb 138 #define ei_outsw outsw 139 140 #endif /* !NE2000_ODDOFFSET */ 141 142 #define ei_inb_p ei_inb 143 #define ei_outb_p ei_outb 144 145 #include "lib8390.c" 146 147 /* 148 * Hard reset the card. This used to pause for the same period that a 149 * 8390 reset command required, but that shouldn't be necessary. 150 */ 151 static void mcf8390_reset_8390(struct net_device *dev) 152 { 153 unsigned long reset_start_time = jiffies; 154 u32 addr = dev->base_addr; 155 struct ei_device *ei_local = netdev_priv(dev); 156 157 netif_dbg(ei_local, hw, dev, "resetting the 8390 t=%ld...\n", jiffies); 158 159 ei_outb(ei_inb(addr + NE_RESET), addr + NE_RESET); 160 161 ei_status.txing = 0; 162 ei_status.dmaing = 0; 163 164 /* This check _should_not_ be necessary, omit eventually. */ 165 while ((ei_inb(addr + NE_EN0_ISR) & ENISR_RESET) == 0) { 166 if (time_after(jiffies, reset_start_time + 2 * HZ / 100)) { 167 netdev_warn(dev, "%s: did not complete\n", __func__); 168 break; 169 } 170 } 171 172 ei_outb(ENISR_RESET, addr + NE_EN0_ISR); 173 } 174 175 /* 176 * This *shouldn't* happen. 177 * If it does, it's the last thing you'll see 178 */ 179 static void mcf8390_dmaing_err(const char *func, struct net_device *dev, 180 struct ei_device *ei_local) 181 { 182 netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n", 183 func, ei_local->dmaing, ei_local->irqlock); 184 } 185 186 /* 187 * Grab the 8390 specific header. Similar to the block_input routine, but 188 * we don't need to be concerned with ring wrap as the header will be at 189 * the start of a page, so we optimize accordingly. 190 */ 191 static void mcf8390_get_8390_hdr(struct net_device *dev, 192 struct e8390_pkt_hdr *hdr, int ring_page) 193 { 194 struct ei_device *ei_local = netdev_priv(dev); 195 u32 addr = dev->base_addr; 196 197 if (ei_local->dmaing) { 198 mcf8390_dmaing_err(__func__, dev, ei_local); 199 return; 200 } 201 202 ei_local->dmaing |= 0x01; 203 ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, addr + NE_CMD); 204 ei_outb(ENISR_RDC, addr + NE_EN0_ISR); 205 ei_outb(sizeof(struct e8390_pkt_hdr), addr + NE_EN0_RCNTLO); 206 ei_outb(0, addr + NE_EN0_RCNTHI); 207 ei_outb(0, addr + NE_EN0_RSARLO); /* On page boundary */ 208 ei_outb(ring_page, addr + NE_EN0_RSARHI); 209 ei_outb(E8390_RREAD + E8390_START, addr + NE_CMD); 210 211 ei_insw(addr + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr) >> 1); 212 213 outb(ENISR_RDC, addr + NE_EN0_ISR); /* Ack intr */ 214 ei_local->dmaing &= ~0x01; 215 216 hdr->count = cpu_to_le16(hdr->count); 217 } 218 219 /* 220 * Block input and output, similar to the Crynwr packet driver. 221 * If you are porting to a new ethercard, look at the packet driver source 222 * for hints. The NEx000 doesn't share the on-board packet memory -- 223 * you have to put the packet out through the "remote DMA" dataport 224 * using z_writeb. 225 */ 226 static void mcf8390_block_input(struct net_device *dev, int count, 227 struct sk_buff *skb, int ring_offset) 228 { 229 struct ei_device *ei_local = netdev_priv(dev); 230 u32 addr = dev->base_addr; 231 char *buf = skb->data; 232 233 if (ei_local->dmaing) { 234 mcf8390_dmaing_err(__func__, dev, ei_local); 235 return; 236 } 237 238 ei_local->dmaing |= 0x01; 239 ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, addr + NE_CMD); 240 ei_outb(ENISR_RDC, addr + NE_EN0_ISR); 241 ei_outb(count & 0xff, addr + NE_EN0_RCNTLO); 242 ei_outb(count >> 8, addr + NE_EN0_RCNTHI); 243 ei_outb(ring_offset & 0xff, addr + NE_EN0_RSARLO); 244 ei_outb(ring_offset >> 8, addr + NE_EN0_RSARHI); 245 ei_outb(E8390_RREAD + E8390_START, addr + NE_CMD); 246 247 ei_insw(addr + NE_DATAPORT, buf, count >> 1); 248 if (count & 1) 249 buf[count - 1] = ei_inb(addr + NE_DATAPORT); 250 251 ei_outb(ENISR_RDC, addr + NE_EN0_ISR); /* Ack intr */ 252 ei_local->dmaing &= ~0x01; 253 } 254 255 static void mcf8390_block_output(struct net_device *dev, int count, 256 const unsigned char *buf, 257 const int start_page) 258 { 259 struct ei_device *ei_local = netdev_priv(dev); 260 u32 addr = dev->base_addr; 261 unsigned long dma_start; 262 263 /* Make sure we transfer all bytes if 16bit IO writes */ 264 if (count & 0x1) 265 count++; 266 267 if (ei_local->dmaing) { 268 mcf8390_dmaing_err(__func__, dev, ei_local); 269 return; 270 } 271 272 ei_local->dmaing |= 0x01; 273 /* We should already be in page 0, but to be safe... */ 274 ei_outb(E8390_PAGE0 + E8390_START + E8390_NODMA, addr + NE_CMD); 275 276 ei_outb(ENISR_RDC, addr + NE_EN0_ISR); 277 278 /* Now the normal output. */ 279 ei_outb(count & 0xff, addr + NE_EN0_RCNTLO); 280 ei_outb(count >> 8, addr + NE_EN0_RCNTHI); 281 ei_outb(0x00, addr + NE_EN0_RSARLO); 282 ei_outb(start_page, addr + NE_EN0_RSARHI); 283 ei_outb(E8390_RWRITE + E8390_START, addr + NE_CMD); 284 285 ei_outsw(addr + NE_DATAPORT, buf, count >> 1); 286 287 dma_start = jiffies; 288 while ((ei_inb(addr + NE_EN0_ISR) & ENISR_RDC) == 0) { 289 if (time_after(jiffies, dma_start + 2 * HZ / 100)) { /* 20ms */ 290 netdev_warn(dev, "timeout waiting for Tx RDC\n"); 291 mcf8390_reset_8390(dev); 292 __NS8390_init(dev, 1); 293 break; 294 } 295 } 296 297 ei_outb(ENISR_RDC, addr + NE_EN0_ISR); /* Ack intr */ 298 ei_local->dmaing &= ~0x01; 299 } 300 301 static const struct net_device_ops mcf8390_netdev_ops = { 302 .ndo_open = __ei_open, 303 .ndo_stop = __ei_close, 304 .ndo_start_xmit = __ei_start_xmit, 305 .ndo_tx_timeout = __ei_tx_timeout, 306 .ndo_get_stats = __ei_get_stats, 307 .ndo_set_rx_mode = __ei_set_multicast_list, 308 .ndo_validate_addr = eth_validate_addr, 309 .ndo_set_mac_address = eth_mac_addr, 310 #ifdef CONFIG_NET_POLL_CONTROLLER 311 .ndo_poll_controller = __ei_poll, 312 #endif 313 }; 314 315 static int mcf8390_init(struct net_device *dev) 316 { 317 static u32 offsets[] = { 318 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 319 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 320 }; 321 struct ei_device *ei_local = netdev_priv(dev); 322 unsigned char SA_prom[32]; 323 u32 addr = dev->base_addr; 324 int start_page, stop_page; 325 int i, ret; 326 327 mcf8390_reset_8390(dev); 328 329 /* 330 * Read the 16 bytes of station address PROM. 331 * We must first initialize registers, 332 * similar to NS8390_init(eifdev, 0). 333 * We can't reliably read the SAPROM address without this. 334 * (I learned the hard way!). 335 */ 336 { 337 static const struct { 338 u32 value; 339 u32 offset; 340 } program_seq[] = { 341 {E8390_NODMA + E8390_PAGE0 + E8390_STOP, NE_CMD}, 342 /* Select page 0 */ 343 {0x48, NE_EN0_DCFG}, /* 0x48: Set byte-wide access */ 344 {0x00, NE_EN0_RCNTLO}, /* Clear the count regs */ 345 {0x00, NE_EN0_RCNTHI}, 346 {0x00, NE_EN0_IMR}, /* Mask completion irq */ 347 {0xFF, NE_EN0_ISR}, 348 {E8390_RXOFF, NE_EN0_RXCR}, /* 0x20 Set to monitor */ 349 {E8390_TXOFF, NE_EN0_TXCR}, /* 0x02 and loopback mode */ 350 {32, NE_EN0_RCNTLO}, 351 {0x00, NE_EN0_RCNTHI}, 352 {0x00, NE_EN0_RSARLO}, /* DMA starting at 0x0000 */ 353 {0x00, NE_EN0_RSARHI}, 354 {E8390_RREAD + E8390_START, NE_CMD}, 355 }; 356 for (i = 0; i < ARRAY_SIZE(program_seq); i++) { 357 ei_outb(program_seq[i].value, 358 addr + program_seq[i].offset); 359 } 360 } 361 362 for (i = 0; i < 16; i++) { 363 SA_prom[i] = ei_inb(addr + NE_DATAPORT); 364 ei_inb(addr + NE_DATAPORT); 365 } 366 367 /* We must set the 8390 for word mode. */ 368 ei_outb(0x49, addr + NE_EN0_DCFG); 369 start_page = NESM_START_PG; 370 stop_page = NESM_STOP_PG; 371 372 /* Install the Interrupt handler */ 373 ret = request_irq(dev->irq, __ei_interrupt, 0, dev->name, dev); 374 if (ret) 375 return ret; 376 377 eth_hw_addr_set(dev, SA_prom); 378 379 netdev_dbg(dev, "Found ethernet address: %pM\n", dev->dev_addr); 380 381 ei_local->name = "mcf8390"; 382 ei_local->tx_start_page = start_page; 383 ei_local->stop_page = stop_page; 384 ei_local->word16 = 1; 385 ei_local->rx_start_page = start_page + TX_PAGES; 386 ei_local->reset_8390 = mcf8390_reset_8390; 387 ei_local->block_input = mcf8390_block_input; 388 ei_local->block_output = mcf8390_block_output; 389 ei_local->get_8390_hdr = mcf8390_get_8390_hdr; 390 ei_local->reg_offset = offsets; 391 392 dev->netdev_ops = &mcf8390_netdev_ops; 393 __NS8390_init(dev, 0); 394 ret = register_netdev(dev); 395 if (ret) { 396 free_irq(dev->irq, dev); 397 return ret; 398 } 399 400 netdev_info(dev, "addr=0x%08x irq=%d, Ethernet Address %pM\n", 401 addr, dev->irq, dev->dev_addr); 402 return 0; 403 } 404 405 static int mcf8390_probe(struct platform_device *pdev) 406 { 407 struct net_device *dev; 408 struct resource *mem; 409 resource_size_t msize; 410 int ret, irq; 411 412 irq = platform_get_irq(pdev, 0); 413 if (irq < 0) 414 return -ENXIO; 415 416 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 417 if (mem == NULL) { 418 dev_err(&pdev->dev, "no memory address specified?\n"); 419 return -ENXIO; 420 } 421 msize = resource_size(mem); 422 if (!request_mem_region(mem->start, msize, pdev->name)) 423 return -EBUSY; 424 425 dev = ____alloc_ei_netdev(0); 426 if (dev == NULL) { 427 release_mem_region(mem->start, msize); 428 return -ENOMEM; 429 } 430 431 SET_NETDEV_DEV(dev, &pdev->dev); 432 platform_set_drvdata(pdev, dev); 433 434 dev->irq = irq; 435 dev->base_addr = mem->start; 436 437 ret = mcf8390_init(dev); 438 if (ret) { 439 release_mem_region(mem->start, msize); 440 free_netdev(dev); 441 return ret; 442 } 443 return 0; 444 } 445 446 static int mcf8390_remove(struct platform_device *pdev) 447 { 448 struct net_device *dev = platform_get_drvdata(pdev); 449 struct resource *mem; 450 451 unregister_netdev(dev); 452 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 453 if (mem) 454 release_mem_region(mem->start, resource_size(mem)); 455 free_netdev(dev); 456 return 0; 457 } 458 459 static struct platform_driver mcf8390_drv = { 460 .driver = { 461 .name = "mcf8390", 462 }, 463 .probe = mcf8390_probe, 464 .remove = mcf8390_remove, 465 }; 466 467 module_platform_driver(mcf8390_drv); 468 469 MODULE_DESCRIPTION("MCF8390 ColdFire NS8390 driver"); 470 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>"); 471 MODULE_LICENSE("GPL"); 472 MODULE_ALIAS("platform:mcf8390"); 473