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 	release_mem_region(mem->start, resource_size(mem));
454 	free_netdev(dev);
455 	return 0;
456 }
457 
458 static struct platform_driver mcf8390_drv = {
459 	.driver = {
460 		.name	= "mcf8390",
461 	},
462 	.probe		= mcf8390_probe,
463 	.remove		= mcf8390_remove,
464 };
465 
466 module_platform_driver(mcf8390_drv);
467 
468 MODULE_DESCRIPTION("MCF8390 ColdFire NS8390 driver");
469 MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
470 MODULE_LICENSE("GPL");
471 MODULE_ALIAS("platform:mcf8390");
472