xref: /openbmc/linux/drivers/net/wan/c101.c (revision 63dc02bd)
1 /*
2  * Moxa C101 synchronous serial card driver for Linux
3  *
4  * Copyright (C) 2000-2003 Krzysztof Halasa <khc@pm.waw.pl>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of version 2 of the GNU General Public License
8  * as published by the Free Software Foundation.
9  *
10  * For information see <http://www.kernel.org/pub/linux/utils/net/hdlc/>
11  *
12  * Sources of information:
13  *    Hitachi HD64570 SCA User's Manual
14  *    Moxa C101 User's Manual
15  */
16 
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/capability.h>
22 #include <linux/slab.h>
23 #include <linux/types.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/init.h>
27 #include <linux/moduleparam.h>
28 #include <linux/netdevice.h>
29 #include <linux/hdlc.h>
30 #include <linux/delay.h>
31 #include <asm/io.h>
32 
33 #include "hd64570.h"
34 
35 
36 static const char* version = "Moxa C101 driver version: 1.15";
37 static const char* devname = "C101";
38 
39 #undef DEBUG_PKT
40 #define DEBUG_RINGS
41 
42 #define C101_PAGE 0x1D00
43 #define C101_DTR 0x1E00
44 #define C101_SCA 0x1F00
45 #define C101_WINDOW_SIZE 0x2000
46 #define C101_MAPPED_RAM_SIZE 0x4000
47 
48 #define RAM_SIZE (256 * 1024)
49 #define TX_RING_BUFFERS 10
50 #define RX_RING_BUFFERS ((RAM_SIZE - C101_WINDOW_SIZE) /		\
51 			 (sizeof(pkt_desc) + HDLC_MAX_MRU) - TX_RING_BUFFERS)
52 
53 #define CLOCK_BASE 9830400	/* 9.8304 MHz */
54 #define PAGE0_ALWAYS_MAPPED
55 
56 static char *hw;		/* pointer to hw=xxx command line string */
57 
58 
59 typedef struct card_s {
60 	struct net_device *dev;
61 	spinlock_t lock;	/* TX lock */
62 	u8 __iomem *win0base;	/* ISA window base address */
63 	u32 phy_winbase;	/* ISA physical base address */
64 	sync_serial_settings settings;
65 	int rxpart;		/* partial frame received, next frame invalid*/
66 	unsigned short encoding;
67 	unsigned short parity;
68 	u16 rx_ring_buffers;	/* number of buffers in a ring */
69 	u16 tx_ring_buffers;
70 	u16 buff_offset;	/* offset of first buffer of first channel */
71 	u16 rxin;		/* rx ring buffer 'in' pointer */
72 	u16 txin;		/* tx ring buffer 'in' and 'last' pointers */
73 	u16 txlast;
74 	u8 rxs, txs, tmc;	/* SCA registers */
75 	u8 irq;			/* IRQ (3-15) */
76 	u8 page;
77 
78 	struct card_s *next_card;
79 }card_t;
80 
81 typedef card_t port_t;
82 
83 static card_t *first_card;
84 static card_t **new_card = &first_card;
85 
86 
87 #define sca_in(reg, card)	   readb((card)->win0base + C101_SCA + (reg))
88 #define sca_out(value, reg, card)  writeb(value, (card)->win0base + C101_SCA + (reg))
89 #define sca_inw(reg, card)	   readw((card)->win0base + C101_SCA + (reg))
90 
91 /* EDA address register must be set in EDAL, EDAH order - 8 bit ISA bus */
92 #define sca_outw(value, reg, card) do { \
93 	writeb(value & 0xFF, (card)->win0base + C101_SCA + (reg)); \
94 	writeb((value >> 8 ) & 0xFF, (card)->win0base + C101_SCA + (reg + 1));\
95 } while(0)
96 
97 #define port_to_card(port)	   (port)
98 #define log_node(port)		   (0)
99 #define phy_node(port)		   (0)
100 #define winsize(card)		   (C101_WINDOW_SIZE)
101 #define win0base(card)		   ((card)->win0base)
102 #define winbase(card)      	   ((card)->win0base + 0x2000)
103 #define get_port(card, port)	   (card)
104 static void sca_msci_intr(port_t *port);
105 
106 
107 static inline u8 sca_get_page(card_t *card)
108 {
109 	return card->page;
110 }
111 
112 static inline void openwin(card_t *card, u8 page)
113 {
114 	card->page = page;
115 	writeb(page, card->win0base + C101_PAGE);
116 }
117 
118 
119 #include "hd64570.c"
120 
121 
122 static inline void set_carrier(port_t *port)
123 {
124 	if (!(sca_in(MSCI1_OFFSET + ST3, port) & ST3_DCD))
125 		netif_carrier_on(port_to_dev(port));
126 	else
127 		netif_carrier_off(port_to_dev(port));
128 }
129 
130 
131 static void sca_msci_intr(port_t *port)
132 {
133 	u8 stat = sca_in(MSCI0_OFFSET + ST1, port); /* read MSCI ST1 status */
134 
135 	/* Reset MSCI TX underrun and CDCD (ignored) status bit */
136 	sca_out(stat & (ST1_UDRN | ST1_CDCD), MSCI0_OFFSET + ST1, port);
137 
138 	if (stat & ST1_UDRN) {
139 		/* TX Underrun error detected */
140 		port_to_dev(port)->stats.tx_errors++;
141 		port_to_dev(port)->stats.tx_fifo_errors++;
142 	}
143 
144 	stat = sca_in(MSCI1_OFFSET + ST1, port); /* read MSCI1 ST1 status */
145 	/* Reset MSCI CDCD status bit - uses ch#2 DCD input */
146 	sca_out(stat & ST1_CDCD, MSCI1_OFFSET + ST1, port);
147 
148 	if (stat & ST1_CDCD)
149 		set_carrier(port);
150 }
151 
152 
153 static void c101_set_iface(port_t *port)
154 {
155 	u8 rxs = port->rxs & CLK_BRG_MASK;
156 	u8 txs = port->txs & CLK_BRG_MASK;
157 
158 	switch(port->settings.clock_type) {
159 	case CLOCK_INT:
160 		rxs |= CLK_BRG_RX; /* TX clock */
161 		txs |= CLK_RXCLK_TX; /* BRG output */
162 		break;
163 
164 	case CLOCK_TXINT:
165 		rxs |= CLK_LINE_RX; /* RXC input */
166 		txs |= CLK_BRG_TX; /* BRG output */
167 		break;
168 
169 	case CLOCK_TXFROMRX:
170 		rxs |= CLK_LINE_RX; /* RXC input */
171 		txs |= CLK_RXCLK_TX; /* RX clock */
172 		break;
173 
174 	default:	/* EXTernal clock */
175 		rxs |= CLK_LINE_RX; /* RXC input */
176 		txs |= CLK_LINE_TX; /* TXC input */
177 	}
178 
179 	port->rxs = rxs;
180 	port->txs = txs;
181 	sca_out(rxs, MSCI1_OFFSET + RXS, port);
182 	sca_out(txs, MSCI1_OFFSET + TXS, port);
183 	sca_set_port(port);
184 }
185 
186 
187 static int c101_open(struct net_device *dev)
188 {
189 	port_t *port = dev_to_port(dev);
190 	int result;
191 
192 	result = hdlc_open(dev);
193 	if (result)
194 		return result;
195 
196 	writeb(1, port->win0base + C101_DTR);
197 	sca_out(0, MSCI1_OFFSET + CTL, port); /* RTS uses ch#2 output */
198 	sca_open(dev);
199 	/* DCD is connected to port 2 !@#$%^& - disable MSCI0 CDCD interrupt */
200 	sca_out(IE1_UDRN, MSCI0_OFFSET + IE1, port);
201 	sca_out(IE0_TXINT, MSCI0_OFFSET + IE0, port);
202 
203 	set_carrier(port);
204 
205 	/* enable MSCI1 CDCD interrupt */
206 	sca_out(IE1_CDCD, MSCI1_OFFSET + IE1, port);
207 	sca_out(IE0_RXINTA, MSCI1_OFFSET + IE0, port);
208 	sca_out(0x48, IER0, port); /* TXINT #0 and RXINT #1 */
209 	c101_set_iface(port);
210 	return 0;
211 }
212 
213 
214 static int c101_close(struct net_device *dev)
215 {
216 	port_t *port = dev_to_port(dev);
217 
218 	sca_close(dev);
219 	writeb(0, port->win0base + C101_DTR);
220 	sca_out(CTL_NORTS, MSCI1_OFFSET + CTL, port);
221 	hdlc_close(dev);
222 	return 0;
223 }
224 
225 
226 static int c101_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
227 {
228 	const size_t size = sizeof(sync_serial_settings);
229 	sync_serial_settings new_line;
230 	sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
231 	port_t *port = dev_to_port(dev);
232 
233 #ifdef DEBUG_RINGS
234 	if (cmd == SIOCDEVPRIVATE) {
235 		sca_dump_rings(dev);
236 		printk(KERN_DEBUG "MSCI1: ST: %02x %02x %02x %02x\n",
237 		       sca_in(MSCI1_OFFSET + ST0, port),
238 		       sca_in(MSCI1_OFFSET + ST1, port),
239 		       sca_in(MSCI1_OFFSET + ST2, port),
240 		       sca_in(MSCI1_OFFSET + ST3, port));
241 		return 0;
242 	}
243 #endif
244 	if (cmd != SIOCWANDEV)
245 		return hdlc_ioctl(dev, ifr, cmd);
246 
247 	switch(ifr->ifr_settings.type) {
248 	case IF_GET_IFACE:
249 		ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
250 		if (ifr->ifr_settings.size < size) {
251 			ifr->ifr_settings.size = size; /* data size wanted */
252 			return -ENOBUFS;
253 		}
254 		if (copy_to_user(line, &port->settings, size))
255 			return -EFAULT;
256 		return 0;
257 
258 	case IF_IFACE_SYNC_SERIAL:
259 		if(!capable(CAP_NET_ADMIN))
260 			return -EPERM;
261 
262 		if (copy_from_user(&new_line, line, size))
263 			return -EFAULT;
264 
265 		if (new_line.clock_type != CLOCK_EXT &&
266 		    new_line.clock_type != CLOCK_TXFROMRX &&
267 		    new_line.clock_type != CLOCK_INT &&
268 		    new_line.clock_type != CLOCK_TXINT)
269 			return -EINVAL;	/* No such clock setting */
270 
271 		if (new_line.loopback != 0 && new_line.loopback != 1)
272 			return -EINVAL;
273 
274 		memcpy(&port->settings, &new_line, size); /* Update settings */
275 		c101_set_iface(port);
276 		return 0;
277 
278 	default:
279 		return hdlc_ioctl(dev, ifr, cmd);
280 	}
281 }
282 
283 
284 
285 static void c101_destroy_card(card_t *card)
286 {
287 	readb(card->win0base + C101_PAGE); /* Resets SCA? */
288 
289 	if (card->irq)
290 		free_irq(card->irq, card);
291 
292 	if (card->win0base) {
293 		iounmap(card->win0base);
294 		release_mem_region(card->phy_winbase, C101_MAPPED_RAM_SIZE);
295 	}
296 
297 	free_netdev(card->dev);
298 
299 	kfree(card);
300 }
301 
302 static const struct net_device_ops c101_ops = {
303 	.ndo_open       = c101_open,
304 	.ndo_stop       = c101_close,
305 	.ndo_change_mtu = hdlc_change_mtu,
306 	.ndo_start_xmit = hdlc_start_xmit,
307 	.ndo_do_ioctl   = c101_ioctl,
308 };
309 
310 static int __init c101_run(unsigned long irq, unsigned long winbase)
311 {
312 	struct net_device *dev;
313 	hdlc_device *hdlc;
314 	card_t *card;
315 	int result;
316 
317 	if (irq<3 || irq>15 || irq == 6) /* FIXME */ {
318 		pr_err("invalid IRQ value\n");
319 		return -ENODEV;
320 	}
321 
322 	if (winbase < 0xC0000 || winbase > 0xDFFFF || (winbase & 0x3FFF) !=0) {
323 		pr_err("invalid RAM value\n");
324 		return -ENODEV;
325 	}
326 
327 	card = kzalloc(sizeof(card_t), GFP_KERNEL);
328 	if (card == NULL)
329 		return -ENOBUFS;
330 
331 	card->dev = alloc_hdlcdev(card);
332 	if (!card->dev) {
333 		pr_err("unable to allocate memory\n");
334 		kfree(card);
335 		return -ENOBUFS;
336 	}
337 
338 	if (request_irq(irq, sca_intr, 0, devname, card)) {
339 		pr_err("could not allocate IRQ\n");
340 		c101_destroy_card(card);
341 		return -EBUSY;
342 	}
343 	card->irq = irq;
344 
345 	if (!request_mem_region(winbase, C101_MAPPED_RAM_SIZE, devname)) {
346 		pr_err("could not request RAM window\n");
347 		c101_destroy_card(card);
348 		return -EBUSY;
349 	}
350 	card->phy_winbase = winbase;
351 	card->win0base = ioremap(winbase, C101_MAPPED_RAM_SIZE);
352 	if (!card->win0base) {
353 		pr_err("could not map I/O address\n");
354 		c101_destroy_card(card);
355 		return -EFAULT;
356 	}
357 
358 	card->tx_ring_buffers = TX_RING_BUFFERS;
359 	card->rx_ring_buffers = RX_RING_BUFFERS;
360 	card->buff_offset = C101_WINDOW_SIZE; /* Bytes 1D00-1FFF reserved */
361 
362 	readb(card->win0base + C101_PAGE); /* Resets SCA? */
363 	udelay(100);
364 	writeb(0, card->win0base + C101_PAGE);
365 	writeb(0, card->win0base + C101_DTR); /* Power-up for RAM? */
366 
367 	sca_init(card, 0);
368 
369 	dev = port_to_dev(card);
370 	hdlc = dev_to_hdlc(dev);
371 
372 	spin_lock_init(&card->lock);
373 	dev->irq = irq;
374 	dev->mem_start = winbase;
375 	dev->mem_end = winbase + C101_MAPPED_RAM_SIZE - 1;
376 	dev->tx_queue_len = 50;
377 	dev->netdev_ops = &c101_ops;
378 	hdlc->attach = sca_attach;
379 	hdlc->xmit = sca_xmit;
380 	card->settings.clock_type = CLOCK_EXT;
381 
382 	result = register_hdlc_device(dev);
383 	if (result) {
384 		pr_warn("unable to register hdlc device\n");
385 		c101_destroy_card(card);
386 		return result;
387 	}
388 
389 	sca_init_port(card); /* Set up C101 memory */
390 	set_carrier(card);
391 
392 	netdev_info(dev, "Moxa C101 on IRQ%u, using %u TX + %u RX packets rings\n",
393 		    card->irq, card->tx_ring_buffers, card->rx_ring_buffers);
394 
395 	*new_card = card;
396 	new_card = &card->next_card;
397 	return 0;
398 }
399 
400 
401 
402 static int __init c101_init(void)
403 {
404 	if (hw == NULL) {
405 #ifdef MODULE
406 		pr_info("no card initialized\n");
407 #endif
408 		return -EINVAL;	/* no parameters specified, abort */
409 	}
410 
411 	pr_info("%s\n", version);
412 
413 	do {
414 		unsigned long irq, ram;
415 
416 		irq = simple_strtoul(hw, &hw, 0);
417 
418 		if (*hw++ != ',')
419 			break;
420 		ram = simple_strtoul(hw, &hw, 0);
421 
422 		if (*hw == ':' || *hw == '\x0')
423 			c101_run(irq, ram);
424 
425 		if (*hw == '\x0')
426 			return first_card ? 0 : -EINVAL;
427 	}while(*hw++ == ':');
428 
429 	pr_err("invalid hardware parameters\n");
430 	return first_card ? 0 : -EINVAL;
431 }
432 
433 
434 static void __exit c101_cleanup(void)
435 {
436 	card_t *card = first_card;
437 
438 	while (card) {
439 		card_t *ptr = card;
440 		card = card->next_card;
441 		unregister_hdlc_device(port_to_dev(ptr));
442 		c101_destroy_card(ptr);
443 	}
444 }
445 
446 
447 module_init(c101_init);
448 module_exit(c101_cleanup);
449 
450 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
451 MODULE_DESCRIPTION("Moxa C101 serial port driver");
452 MODULE_LICENSE("GPL v2");
453 module_param(hw, charp, 0444);
454 MODULE_PARM_DESC(hw, "irq,ram:irq,...");
455