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Linux/drivers/net/ethernet/8390/mcf8390.c

  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 static u32 mcf8390_msg_enable;
 42 
 43 #ifdef NE2000_ODDOFFSET
 44 /*
 45  * A lot of the ColdFire boards use a separate address region for odd offset
 46  * register addresses. The following functions convert and map as required.
 47  * Note that the data port accesses are treated a little differently, and
 48  * always accessed via the insX/outsX functions.
 49  */
 50 static inline u32 NE_PTR(u32 addr)
 51 {
 52         if (addr & 1)
 53                 return addr - 1 + NE2000_ODDOFFSET;
 54         return addr;
 55 }
 56 
 57 static inline u32 NE_DATA_PTR(u32 addr)
 58 {
 59         return addr;
 60 }
 61 
 62 void ei_outb(u32 val, u32 addr)
 63 {
 64         NE2000_BYTE *rp;
 65 
 66         rp = (NE2000_BYTE *) NE_PTR(addr);
 67         *rp = RSWAP(val);
 68 }
 69 
 70 #define ei_inb  ei_inb
 71 u8 ei_inb(u32 addr)
 72 {
 73         NE2000_BYTE *rp, val;
 74 
 75         rp = (NE2000_BYTE *) NE_PTR(addr);
 76         val = *rp;
 77         return (u8) (RSWAP(val) & 0xff);
 78 }
 79 
 80 void ei_insb(u32 addr, void *vbuf, int len)
 81 {
 82         NE2000_BYTE *rp, val;
 83         u8 *buf;
 84 
 85         buf = (u8 *) vbuf;
 86         rp = (NE2000_BYTE *) NE_DATA_PTR(addr);
 87         for (; (len > 0); len--) {
 88                 val = *rp;
 89                 *buf++ = RSWAP(val);
 90         }
 91 }
 92 
 93 void ei_insw(u32 addr, void *vbuf, int len)
 94 {
 95         volatile u16 *rp;
 96         u16 w, *buf;
 97 
 98         buf = (u16 *) vbuf;
 99         rp = (volatile u16 *) NE_DATA_PTR(addr);
100         for (; (len > 0); len--) {
101                 w = *rp;
102                 *buf++ = BSWAP(w);
103         }
104 }
105 
106 void ei_outsb(u32 addr, const void *vbuf, int len)
107 {
108         NE2000_BYTE *rp, val;
109         u8 *buf;
110 
111         buf = (u8 *) vbuf;
112         rp = (NE2000_BYTE *) NE_DATA_PTR(addr);
113         for (; (len > 0); len--) {
114                 val = *buf++;
115                 *rp = RSWAP(val);
116         }
117 }
118 
119 void ei_outsw(u32 addr, const void *vbuf, int len)
120 {
121         volatile u16 *rp;
122         u16 w, *buf;
123 
124         buf = (u16 *) vbuf;
125         rp = (volatile u16 *) NE_DATA_PTR(addr);
126         for (; (len > 0); len--) {
127                 w = *buf++;
128                 *rp = BSWAP(w);
129         }
130 }
131 
132 #else /* !NE2000_ODDOFFSET */
133 
134 #define ei_inb          inb
135 #define ei_outb         outb
136 #define ei_insb         insb
137 #define ei_insw         insw
138 #define ei_outsb        outsb
139 #define ei_outsw        outsw
140 
141 #endif /* !NE2000_ODDOFFSET */
142 
143 #define ei_inb_p        ei_inb
144 #define ei_outb_p       ei_outb
145 
146 #include "lib8390.c"
147 
148 /*
149  * Hard reset the card. This used to pause for the same period that a
150  * 8390 reset command required, but that shouldn't be necessary.
151  */
152 static void mcf8390_reset_8390(struct net_device *dev)
153 {
154         unsigned long reset_start_time = jiffies;
155         u32 addr = dev->base_addr;
156         struct ei_device *ei_local = netdev_priv(dev);
157 
158         netif_dbg(ei_local, hw, dev, "resetting the 8390 t=%ld...\n", jiffies);
159 
160         ei_outb(ei_inb(addr + NE_RESET), addr + NE_RESET);
161 
162         ei_status.txing = 0;
163         ei_status.dmaing = 0;
164 
165         /* This check _should_not_ be necessary, omit eventually. */
166         while ((ei_inb(addr + NE_EN0_ISR) & ENISR_RESET) == 0) {
167                 if (time_after(jiffies, reset_start_time + 2 * HZ / 100)) {
168                         netdev_warn(dev, "%s: did not complete\n", __func__);
169                         break;
170                 }
171         }
172 
173         ei_outb(ENISR_RESET, addr + NE_EN0_ISR);
174 }
175 
176 /*
177  * This *shouldn't* happen.
178  * If it does, it's the last thing you'll see
179  */
180 static void mcf8390_dmaing_err(const char *func, struct net_device *dev,
181                                struct ei_device *ei_local)
182 {
183         netdev_err(dev, "%s: DMAing conflict [DMAstat:%d][irqlock:%d]\n",
184                 func, ei_local->dmaing, ei_local->irqlock);
185 }
186 
187 /*
188  * Grab the 8390 specific header. Similar to the block_input routine, but
189  * we don't need to be concerned with ring wrap as the header will be at
190  * the start of a page, so we optimize accordingly.
191  */
192 static void mcf8390_get_8390_hdr(struct net_device *dev,
193                                  struct e8390_pkt_hdr *hdr, int ring_page)
194 {
195         struct ei_device *ei_local = netdev_priv(dev);
196         u32 addr = dev->base_addr;
197 
198         if (ei_local->dmaing) {
199                 mcf8390_dmaing_err(__func__, dev, ei_local);
200                 return;
201         }
202 
203         ei_local->dmaing |= 0x01;
204         ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, addr + NE_CMD);
205         ei_outb(ENISR_RDC, addr + NE_EN0_ISR);
206         ei_outb(sizeof(struct e8390_pkt_hdr), addr + NE_EN0_RCNTLO);
207         ei_outb(0, addr + NE_EN0_RCNTHI);
208         ei_outb(0, addr + NE_EN0_RSARLO);               /* On page boundary */
209         ei_outb(ring_page, addr + NE_EN0_RSARHI);
210         ei_outb(E8390_RREAD + E8390_START, addr + NE_CMD);
211 
212         ei_insw(addr + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr) >> 1);
213 
214         outb(ENISR_RDC, addr + NE_EN0_ISR);     /* Ack intr */
215         ei_local->dmaing &= ~0x01;
216 
217         hdr->count = cpu_to_le16(hdr->count);
218 }
219 
220 /*
221  * Block input and output, similar to the Crynwr packet driver.
222  * If you are porting to a new ethercard, look at the packet driver source
223  * for hints. The NEx000 doesn't share the on-board packet memory --
224  * you have to put the packet out through the "remote DMA" dataport
225  * using z_writeb.
226  */
227 static void mcf8390_block_input(struct net_device *dev, int count,
228                                 struct sk_buff *skb, int ring_offset)
229 {
230         struct ei_device *ei_local = netdev_priv(dev);
231         u32 addr = dev->base_addr;
232         char *buf = skb->data;
233 
234         if (ei_local->dmaing) {
235                 mcf8390_dmaing_err(__func__, dev, ei_local);
236                 return;
237         }
238 
239         ei_local->dmaing |= 0x01;
240         ei_outb(E8390_NODMA + E8390_PAGE0 + E8390_START, addr + NE_CMD);
241         ei_outb(ENISR_RDC, addr + NE_EN0_ISR);
242         ei_outb(count & 0xff, addr + NE_EN0_RCNTLO);
243         ei_outb(count >> 8, addr + NE_EN0_RCNTHI);
244         ei_outb(ring_offset & 0xff, addr + NE_EN0_RSARLO);
245         ei_outb(ring_offset >> 8, addr + NE_EN0_RSARHI);
246         ei_outb(E8390_RREAD + E8390_START, addr + NE_CMD);
247 
248         ei_insw(addr + NE_DATAPORT, buf, count >> 1);
249         if (count & 1)
250                 buf[count - 1] = ei_inb(addr + NE_DATAPORT);
251 
252         ei_outb(ENISR_RDC, addr + NE_EN0_ISR);  /* Ack intr */
253         ei_local->dmaing &= ~0x01;
254 }
255 
256 static void mcf8390_block_output(struct net_device *dev, int count,
257                                  const unsigned char *buf,
258                                  const int start_page)
259 {
260         struct ei_device *ei_local = netdev_priv(dev);
261         u32 addr = dev->base_addr;
262         unsigned long dma_start;
263 
264         /* Make sure we transfer all bytes if 16bit IO writes */
265         if (count & 0x1)
266                 count++;
267 
268         if (ei_local->dmaing) {
269                 mcf8390_dmaing_err(__func__, dev, ei_local);
270                 return;
271         }
272 
273         ei_local->dmaing |= 0x01;
274         /* We should already be in page 0, but to be safe... */
275         ei_outb(E8390_PAGE0 + E8390_START + E8390_NODMA, addr + NE_CMD);
276 
277         ei_outb(ENISR_RDC, addr + NE_EN0_ISR);
278 
279         /* Now the normal output. */
280         ei_outb(count & 0xff, addr + NE_EN0_RCNTLO);
281         ei_outb(count >> 8, addr + NE_EN0_RCNTHI);
282         ei_outb(0x00, addr + NE_EN0_RSARLO);
283         ei_outb(start_page, addr + NE_EN0_RSARHI);
284         ei_outb(E8390_RWRITE + E8390_START, addr + NE_CMD);
285 
286         ei_outsw(addr + NE_DATAPORT, buf, count >> 1);
287 
288         dma_start = jiffies;
289         while ((ei_inb(addr + NE_EN0_ISR) & ENISR_RDC) == 0) {
290                 if (time_after(jiffies, dma_start + 2 * HZ / 100)) { /* 20ms */
291                         netdev_warn(dev, "timeout waiting for Tx RDC\n");
292                         mcf8390_reset_8390(dev);
293                         __NS8390_init(dev, 1);
294                         break;
295                 }
296         }
297 
298         ei_outb(ENISR_RDC, addr + NE_EN0_ISR);  /* Ack intr */
299         ei_local->dmaing &= ~0x01;
300 }
301 
302 static const struct net_device_ops mcf8390_netdev_ops = {
303         .ndo_open               = __ei_open,
304         .ndo_stop               = __ei_close,
305         .ndo_start_xmit         = __ei_start_xmit,
306         .ndo_tx_timeout         = __ei_tx_timeout,
307         .ndo_get_stats          = __ei_get_stats,
308         .ndo_set_rx_mode        = __ei_set_multicast_list,
309         .ndo_validate_addr      = eth_validate_addr,
310         .ndo_set_mac_address    = eth_mac_addr,
311         .ndo_change_mtu         = eth_change_mtu,
312 #ifdef CONFIG_NET_POLL_CONTROLLER
313         .ndo_poll_controller    = __ei_poll,
314 #endif
315 };
316 
317 static int mcf8390_init(struct net_device *dev)
318 {
319         static u32 offsets[] = {
320                 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
321                 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
322         };
323         struct ei_device *ei_local = netdev_priv(dev);
324         unsigned char SA_prom[32];
325         u32 addr = dev->base_addr;
326         int start_page, stop_page;
327         int i, ret;
328 
329         mcf8390_reset_8390(dev);
330 
331         /*
332          * Read the 16 bytes of station address PROM.
333          * We must first initialize registers,
334          * similar to NS8390_init(eifdev, 0).
335          * We can't reliably read the SAPROM address without this.
336          * (I learned the hard way!).
337          */
338         {
339                 static const struct {
340                         u32 value;
341                         u32 offset;
342                 } program_seq[] = {
343                         {E8390_NODMA + E8390_PAGE0 + E8390_STOP, NE_CMD},
344                                                 /* Select page 0 */
345                         {0x48,  NE_EN0_DCFG},   /* 0x48: Set byte-wide access */
346                         {0x00,  NE_EN0_RCNTLO}, /* Clear the count regs */
347                         {0x00,  NE_EN0_RCNTHI},
348                         {0x00,  NE_EN0_IMR},    /* Mask completion irq */
349                         {0xFF,  NE_EN0_ISR},
350                         {E8390_RXOFF, NE_EN0_RXCR}, /* 0x20 Set to monitor */
351                         {E8390_TXOFF, NE_EN0_TXCR}, /* 0x02 and loopback mode */
352                         {32,    NE_EN0_RCNTLO},
353                         {0x00,  NE_EN0_RCNTHI},
354                         {0x00,  NE_EN0_RSARLO}, /* DMA starting at 0x0000 */
355                         {0x00,  NE_EN0_RSARHI},
356                         {E8390_RREAD + E8390_START, NE_CMD},
357                 };
358                 for (i = 0; i < ARRAY_SIZE(program_seq); i++) {
359                         ei_outb(program_seq[i].value,
360                                  addr + program_seq[i].offset);
361                 }
362         }
363 
364         for (i = 0; i < 16; i++) {
365                 SA_prom[i] = ei_inb(addr + NE_DATAPORT);
366                 ei_inb(addr + NE_DATAPORT);
367         }
368 
369         /* We must set the 8390 for word mode. */
370         ei_outb(0x49, addr + NE_EN0_DCFG);
371         start_page = NESM_START_PG;
372         stop_page = NESM_STOP_PG;
373 
374         /* Install the Interrupt handler */
375         ret = request_irq(dev->irq, __ei_interrupt, 0, dev->name, dev);
376         if (ret)
377                 return ret;
378 
379         for (i = 0; i < ETH_ALEN; i++)
380                 dev->dev_addr[i] = SA_prom[i];
381 
382         netdev_dbg(dev, "Found ethernet address: %pM\n", dev->dev_addr);
383 
384         ei_local->name = "mcf8390";
385         ei_local->tx_start_page = start_page;
386         ei_local->stop_page = stop_page;
387         ei_local->word16 = 1;
388         ei_local->rx_start_page = start_page + TX_PAGES;
389         ei_local->reset_8390 = mcf8390_reset_8390;
390         ei_local->block_input = mcf8390_block_input;
391         ei_local->block_output = mcf8390_block_output;
392         ei_local->get_8390_hdr = mcf8390_get_8390_hdr;
393         ei_local->reg_offset = offsets;
394 
395         dev->netdev_ops = &mcf8390_netdev_ops;
396         __NS8390_init(dev, 0);
397         ret = register_netdev(dev);
398         if (ret) {
399                 free_irq(dev->irq, dev);
400                 return ret;
401         }
402 
403         netdev_info(dev, "addr=0x%08x irq=%d, Ethernet Address %pM\n",
404                 addr, dev->irq, dev->dev_addr);
405         return 0;
406 }
407 
408 static int mcf8390_probe(struct platform_device *pdev)
409 {
410         struct net_device *dev;
411         struct ei_device *ei_local;
412         struct resource *mem, *irq;
413         resource_size_t msize;
414         int ret;
415 
416         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
417         if (irq == NULL) {
418                 dev_err(&pdev->dev, "no IRQ specified?\n");
419                 return -ENXIO;
420         }
421 
422         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
423         if (mem == NULL) {
424                 dev_err(&pdev->dev, "no memory address specified?\n");
425                 return -ENXIO;
426         }
427         msize = resource_size(mem);
428         if (!request_mem_region(mem->start, msize, pdev->name))
429                 return -EBUSY;
430 
431         dev = ____alloc_ei_netdev(0);
432         if (dev == NULL) {
433                 release_mem_region(mem->start, msize);
434                 return -ENOMEM;
435         }
436 
437         SET_NETDEV_DEV(dev, &pdev->dev);
438         platform_set_drvdata(pdev, dev);
439         ei_local = netdev_priv(dev);
440         ei_local->msg_enable = mcf8390_msg_enable;
441 
442         dev->irq = irq->start;
443         dev->base_addr = mem->start;
444 
445         ret = mcf8390_init(dev);
446         if (ret) {
447                 release_mem_region(mem->start, msize);
448                 free_netdev(dev);
449                 return ret;
450         }
451         return 0;
452 }
453 
454 static int mcf8390_remove(struct platform_device *pdev)
455 {
456         struct net_device *dev = platform_get_drvdata(pdev);
457         struct resource *mem;
458 
459         unregister_netdev(dev);
460         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
461         if (mem)
462                 release_mem_region(mem->start, resource_size(mem));
463         free_netdev(dev);
464         return 0;
465 }
466 
467 static struct platform_driver mcf8390_drv = {
468         .driver = {
469                 .name   = "mcf8390",
470                 .owner  = THIS_MODULE,
471         },
472         .probe          = mcf8390_probe,
473         .remove         = mcf8390_remove,
474 };
475 
476 module_platform_driver(mcf8390_drv);
477 
478 MODULE_DESCRIPTION("MCF8390 ColdFire NS8390 driver");
479 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
480 MODULE_LICENSE("GPL");
481 MODULE_ALIAS("platform:mcf8390");
482 

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