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1da177e4 LT |
1 | /* |
2 | * Driver for high-speed SCC boards (those with DMA support) | |
3 | * Copyright (C) 1997-2000 Klaus Kudielka | |
4 | * | |
5 | * S5SCC/DMA support by Janko Koleznik S52HI | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | */ | |
21 | ||
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/errno.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/in.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/ioport.h> | |
31 | #include <linux/kernel.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/rtnetlink.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/workqueue.h> | |
37 | #include <asm/atomic.h> | |
38 | #include <asm/bitops.h> | |
39 | #include <asm/dma.h> | |
40 | #include <asm/io.h> | |
41 | #include <asm/irq.h> | |
42 | #include <asm/uaccess.h> | |
43 | #include <net/ax25.h> | |
44 | #include "z8530.h" | |
45 | ||
46 | ||
47 | /* Number of buffers per channel */ | |
48 | ||
49 | #define NUM_TX_BUF 2 /* NUM_TX_BUF >= 1 (min. 2 recommended) */ | |
50 | #define NUM_RX_BUF 6 /* NUM_RX_BUF >= 1 (min. 2 recommended) */ | |
51 | #define BUF_SIZE 1576 /* BUF_SIZE >= mtu + hard_header_len */ | |
52 | ||
53 | ||
54 | /* Cards supported */ | |
55 | ||
56 | #define HW_PI { "Ottawa PI", 0x300, 0x20, 0x10, 8, \ | |
57 | 0, 8, 1843200, 3686400 } | |
58 | #define HW_PI2 { "Ottawa PI2", 0x300, 0x20, 0x10, 8, \ | |
59 | 0, 8, 3686400, 7372800 } | |
60 | #define HW_TWIN { "Gracilis PackeTwin", 0x200, 0x10, 0x10, 32, \ | |
61 | 0, 4, 6144000, 6144000 } | |
62 | #define HW_S5 { "S5SCC/DMA", 0x200, 0x10, 0x10, 32, \ | |
63 | 0, 8, 4915200, 9830400 } | |
64 | ||
65 | #define HARDWARE { HW_PI, HW_PI2, HW_TWIN, HW_S5 } | |
66 | ||
67 | #define TMR_0_HZ 25600 /* Frequency of timer 0 */ | |
68 | ||
69 | #define TYPE_PI 0 | |
70 | #define TYPE_PI2 1 | |
71 | #define TYPE_TWIN 2 | |
72 | #define TYPE_S5 3 | |
73 | #define NUM_TYPES 4 | |
74 | ||
75 | #define MAX_NUM_DEVS 32 | |
76 | ||
77 | ||
78 | /* SCC chips supported */ | |
79 | ||
80 | #define Z8530 0 | |
81 | #define Z85C30 1 | |
82 | #define Z85230 2 | |
83 | ||
84 | #define CHIPNAMES { "Z8530", "Z85C30", "Z85230" } | |
85 | ||
86 | ||
87 | /* I/O registers */ | |
88 | ||
89 | /* 8530 registers relative to card base */ | |
90 | #define SCCB_CMD 0x00 | |
91 | #define SCCB_DATA 0x01 | |
92 | #define SCCA_CMD 0x02 | |
93 | #define SCCA_DATA 0x03 | |
94 | ||
95 | /* 8253/8254 registers relative to card base */ | |
96 | #define TMR_CNT0 0x00 | |
97 | #define TMR_CNT1 0x01 | |
98 | #define TMR_CNT2 0x02 | |
99 | #define TMR_CTRL 0x03 | |
100 | ||
101 | /* Additional PI/PI2 registers relative to card base */ | |
102 | #define PI_DREQ_MASK 0x04 | |
103 | ||
104 | /* Additional PackeTwin registers relative to card base */ | |
105 | #define TWIN_INT_REG 0x08 | |
106 | #define TWIN_CLR_TMR1 0x09 | |
107 | #define TWIN_CLR_TMR2 0x0a | |
108 | #define TWIN_SPARE_1 0x0b | |
109 | #define TWIN_DMA_CFG 0x08 | |
110 | #define TWIN_SERIAL_CFG 0x09 | |
111 | #define TWIN_DMA_CLR_FF 0x0a | |
112 | #define TWIN_SPARE_2 0x0b | |
113 | ||
114 | ||
115 | /* PackeTwin I/O register values */ | |
116 | ||
117 | /* INT_REG */ | |
118 | #define TWIN_SCC_MSK 0x01 | |
119 | #define TWIN_TMR1_MSK 0x02 | |
120 | #define TWIN_TMR2_MSK 0x04 | |
121 | #define TWIN_INT_MSK 0x07 | |
122 | ||
123 | /* SERIAL_CFG */ | |
124 | #define TWIN_DTRA_ON 0x01 | |
125 | #define TWIN_DTRB_ON 0x02 | |
126 | #define TWIN_EXTCLKA 0x04 | |
127 | #define TWIN_EXTCLKB 0x08 | |
128 | #define TWIN_LOOPA_ON 0x10 | |
129 | #define TWIN_LOOPB_ON 0x20 | |
130 | #define TWIN_EI 0x80 | |
131 | ||
132 | /* DMA_CFG */ | |
133 | #define TWIN_DMA_HDX_T1 0x08 | |
134 | #define TWIN_DMA_HDX_R1 0x0a | |
135 | #define TWIN_DMA_HDX_T3 0x14 | |
136 | #define TWIN_DMA_HDX_R3 0x16 | |
137 | #define TWIN_DMA_FDX_T3R1 0x1b | |
138 | #define TWIN_DMA_FDX_T1R3 0x1d | |
139 | ||
140 | ||
141 | /* Status values */ | |
142 | ||
143 | #define IDLE 0 | |
144 | #define TX_HEAD 1 | |
145 | #define TX_DATA 2 | |
146 | #define TX_PAUSE 3 | |
147 | #define TX_TAIL 4 | |
148 | #define RTS_OFF 5 | |
149 | #define WAIT 6 | |
150 | #define DCD_ON 7 | |
151 | #define RX_ON 8 | |
152 | #define DCD_OFF 9 | |
153 | ||
154 | ||
155 | /* Ioctls */ | |
156 | ||
157 | #define SIOCGSCCPARAM SIOCDEVPRIVATE | |
158 | #define SIOCSSCCPARAM (SIOCDEVPRIVATE+1) | |
159 | ||
160 | ||
161 | /* Data types */ | |
162 | ||
163 | struct scc_param { | |
164 | int pclk_hz; /* frequency of BRG input (don't change) */ | |
165 | int brg_tc; /* BRG terminal count; BRG disabled if < 0 */ | |
166 | int nrzi; /* 0 (nrz), 1 (nrzi) */ | |
167 | int clocks; /* see dmascc_cfg documentation */ | |
168 | int txdelay; /* [1/TMR_0_HZ] */ | |
169 | int txtimeout; /* [1/HZ] */ | |
170 | int txtail; /* [1/TMR_0_HZ] */ | |
171 | int waittime; /* [1/TMR_0_HZ] */ | |
172 | int slottime; /* [1/TMR_0_HZ] */ | |
173 | int persist; /* 1 ... 256 */ | |
174 | int dma; /* -1 (disable), 0, 1, 3 */ | |
175 | int txpause; /* [1/TMR_0_HZ] */ | |
176 | int rtsoff; /* [1/TMR_0_HZ] */ | |
177 | int dcdon; /* [1/TMR_0_HZ] */ | |
178 | int dcdoff; /* [1/TMR_0_HZ] */ | |
179 | }; | |
180 | ||
181 | struct scc_hardware { | |
182 | char *name; | |
183 | int io_region; | |
184 | int io_delta; | |
185 | int io_size; | |
186 | int num_devs; | |
187 | int scc_offset; | |
188 | int tmr_offset; | |
189 | int tmr_hz; | |
190 | int pclk_hz; | |
191 | }; | |
192 | ||
193 | struct scc_priv { | |
194 | int type; | |
195 | int chip; | |
196 | struct net_device *dev; | |
197 | struct scc_info *info; | |
198 | struct net_device_stats stats; | |
199 | int channel; | |
200 | int card_base, scc_cmd, scc_data; | |
201 | int tmr_cnt, tmr_ctrl, tmr_mode; | |
202 | struct scc_param param; | |
203 | char rx_buf[NUM_RX_BUF][BUF_SIZE]; | |
204 | int rx_len[NUM_RX_BUF]; | |
205 | int rx_ptr; | |
206 | struct work_struct rx_work; | |
207 | int rx_head, rx_tail, rx_count; | |
208 | int rx_over; | |
209 | char tx_buf[NUM_TX_BUF][BUF_SIZE]; | |
210 | int tx_len[NUM_TX_BUF]; | |
211 | int tx_ptr; | |
212 | int tx_head, tx_tail, tx_count; | |
213 | int state; | |
214 | unsigned long tx_start; | |
215 | int rr0; | |
216 | spinlock_t *register_lock; /* Per scc_info */ | |
217 | spinlock_t ring_lock; | |
218 | }; | |
219 | ||
220 | struct scc_info { | |
221 | int irq_used; | |
222 | int twin_serial_cfg; | |
223 | struct net_device *dev[2]; | |
224 | struct scc_priv priv[2]; | |
225 | struct scc_info *next; | |
226 | spinlock_t register_lock; /* Per device register lock */ | |
227 | }; | |
228 | ||
229 | ||
230 | /* Function declarations */ | |
231 | static int setup_adapter(int card_base, int type, int n) __init; | |
232 | ||
233 | static void write_scc(struct scc_priv *priv, int reg, int val); | |
234 | static void write_scc_data(struct scc_priv *priv, int val, int fast); | |
235 | static int read_scc(struct scc_priv *priv, int reg); | |
236 | static int read_scc_data(struct scc_priv *priv); | |
237 | ||
238 | static int scc_open(struct net_device *dev); | |
239 | static int scc_close(struct net_device *dev); | |
240 | static int scc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd); | |
241 | static int scc_send_packet(struct sk_buff *skb, struct net_device *dev); | |
242 | static struct net_device_stats *scc_get_stats(struct net_device *dev); | |
243 | static int scc_set_mac_address(struct net_device *dev, void *sa); | |
244 | ||
245 | static inline void tx_on(struct scc_priv *priv); | |
246 | static inline void rx_on(struct scc_priv *priv); | |
247 | static inline void rx_off(struct scc_priv *priv); | |
248 | static void start_timer(struct scc_priv *priv, int t, int r15); | |
249 | static inline unsigned char random(void); | |
250 | ||
251 | static inline void z8530_isr(struct scc_info *info); | |
7d12e780 | 252 | static irqreturn_t scc_isr(int irq, void *dev_id); |
1da177e4 LT |
253 | static void rx_isr(struct scc_priv *priv); |
254 | static void special_condition(struct scc_priv *priv, int rc); | |
255 | static void rx_bh(void *arg); | |
256 | static void tx_isr(struct scc_priv *priv); | |
257 | static void es_isr(struct scc_priv *priv); | |
258 | static void tm_isr(struct scc_priv *priv); | |
259 | ||
260 | ||
261 | /* Initialization variables */ | |
262 | ||
263 | static int io[MAX_NUM_DEVS] __initdata = { 0, }; | |
264 | ||
265 | /* Beware! hw[] is also used in cleanup_module(). */ | |
266 | static struct scc_hardware hw[NUM_TYPES] __initdata_or_module = HARDWARE; | |
267 | static char ax25_broadcast[7] __initdata = | |
268 | { 'Q' << 1, 'S' << 1, 'T' << 1, ' ' << 1, ' ' << 1, ' ' << 1, | |
269 | '0' << 1 }; | |
270 | static char ax25_test[7] __initdata = | |
271 | { 'L' << 1, 'I' << 1, 'N' << 1, 'U' << 1, 'X' << 1, ' ' << 1, | |
272 | '1' << 1 }; | |
273 | ||
274 | ||
275 | /* Global variables */ | |
276 | ||
277 | static struct scc_info *first; | |
278 | static unsigned long rand; | |
279 | ||
280 | ||
281 | MODULE_AUTHOR("Klaus Kudielka"); | |
282 | MODULE_DESCRIPTION("Driver for high-speed SCC boards"); | |
8d3b33f6 | 283 | module_param_array(io, int, NULL, 0); |
1da177e4 LT |
284 | MODULE_LICENSE("GPL"); |
285 | ||
286 | static void __exit dmascc_exit(void) | |
287 | { | |
288 | int i; | |
289 | struct scc_info *info; | |
290 | ||
291 | while (first) { | |
292 | info = first; | |
293 | ||
294 | /* Unregister devices */ | |
295 | for (i = 0; i < 2; i++) | |
296 | unregister_netdev(info->dev[i]); | |
297 | ||
298 | /* Reset board */ | |
299 | if (info->priv[0].type == TYPE_TWIN) | |
300 | outb(0, info->dev[0]->base_addr + TWIN_SERIAL_CFG); | |
301 | write_scc(&info->priv[0], R9, FHWRES); | |
302 | release_region(info->dev[0]->base_addr, | |
303 | hw[info->priv[0].type].io_size); | |
304 | ||
305 | for (i = 0; i < 2; i++) | |
306 | free_netdev(info->dev[i]); | |
307 | ||
308 | /* Free memory */ | |
309 | first = info->next; | |
310 | kfree(info); | |
311 | } | |
312 | } | |
313 | ||
1da177e4 LT |
314 | static int __init dmascc_init(void) |
315 | { | |
316 | int h, i, j, n; | |
317 | int base[MAX_NUM_DEVS], tcmd[MAX_NUM_DEVS], t0[MAX_NUM_DEVS], | |
318 | t1[MAX_NUM_DEVS]; | |
319 | unsigned t_val; | |
320 | unsigned long time, start[MAX_NUM_DEVS], delay[MAX_NUM_DEVS], | |
321 | counting[MAX_NUM_DEVS]; | |
322 | ||
323 | /* Initialize random number generator */ | |
324 | rand = jiffies; | |
325 | /* Cards found = 0 */ | |
326 | n = 0; | |
327 | /* Warning message */ | |
328 | if (!io[0]) | |
329 | printk(KERN_INFO "dmascc: autoprobing (dangerous)\n"); | |
330 | ||
331 | /* Run autodetection for each card type */ | |
332 | for (h = 0; h < NUM_TYPES; h++) { | |
333 | ||
334 | if (io[0]) { | |
335 | /* User-specified I/O address regions */ | |
336 | for (i = 0; i < hw[h].num_devs; i++) | |
337 | base[i] = 0; | |
338 | for (i = 0; i < MAX_NUM_DEVS && io[i]; i++) { | |
339 | j = (io[i] - | |
340 | hw[h].io_region) / hw[h].io_delta; | |
341 | if (j >= 0 && j < hw[h].num_devs | |
342 | && hw[h].io_region + | |
343 | j * hw[h].io_delta == io[i]) { | |
344 | base[j] = io[i]; | |
345 | } | |
346 | } | |
347 | } else { | |
348 | /* Default I/O address regions */ | |
349 | for (i = 0; i < hw[h].num_devs; i++) { | |
350 | base[i] = | |
351 | hw[h].io_region + i * hw[h].io_delta; | |
352 | } | |
353 | } | |
354 | ||
355 | /* Check valid I/O address regions */ | |
356 | for (i = 0; i < hw[h].num_devs; i++) | |
357 | if (base[i]) { | |
358 | if (!request_region | |
359 | (base[i], hw[h].io_size, "dmascc")) | |
360 | base[i] = 0; | |
361 | else { | |
362 | tcmd[i] = | |
363 | base[i] + hw[h].tmr_offset + | |
364 | TMR_CTRL; | |
365 | t0[i] = | |
366 | base[i] + hw[h].tmr_offset + | |
367 | TMR_CNT0; | |
368 | t1[i] = | |
369 | base[i] + hw[h].tmr_offset + | |
370 | TMR_CNT1; | |
371 | } | |
372 | } | |
373 | ||
374 | /* Start timers */ | |
375 | for (i = 0; i < hw[h].num_devs; i++) | |
376 | if (base[i]) { | |
377 | /* Timer 0: LSB+MSB, Mode 3, TMR_0_HZ */ | |
378 | outb(0x36, tcmd[i]); | |
379 | outb((hw[h].tmr_hz / TMR_0_HZ) & 0xFF, | |
380 | t0[i]); | |
381 | outb((hw[h].tmr_hz / TMR_0_HZ) >> 8, | |
382 | t0[i]); | |
383 | /* Timer 1: LSB+MSB, Mode 0, HZ/10 */ | |
384 | outb(0x70, tcmd[i]); | |
385 | outb((TMR_0_HZ / HZ * 10) & 0xFF, t1[i]); | |
386 | outb((TMR_0_HZ / HZ * 10) >> 8, t1[i]); | |
387 | start[i] = jiffies; | |
388 | delay[i] = 0; | |
389 | counting[i] = 1; | |
390 | /* Timer 2: LSB+MSB, Mode 0 */ | |
391 | outb(0xb0, tcmd[i]); | |
392 | } | |
393 | time = jiffies; | |
394 | /* Wait until counter registers are loaded */ | |
395 | udelay(2000000 / TMR_0_HZ); | |
396 | ||
397 | /* Timing loop */ | |
398 | while (jiffies - time < 13) { | |
399 | for (i = 0; i < hw[h].num_devs; i++) | |
400 | if (base[i] && counting[i]) { | |
401 | /* Read back Timer 1: latch; read LSB; read MSB */ | |
402 | outb(0x40, tcmd[i]); | |
403 | t_val = | |
404 | inb(t1[i]) + (inb(t1[i]) << 8); | |
405 | /* Also check whether counter did wrap */ | |
406 | if (t_val == 0 | |
407 | || t_val > TMR_0_HZ / HZ * 10) | |
408 | counting[i] = 0; | |
409 | delay[i] = jiffies - start[i]; | |
410 | } | |
411 | } | |
412 | ||
413 | /* Evaluate measurements */ | |
414 | for (i = 0; i < hw[h].num_devs; i++) | |
415 | if (base[i]) { | |
416 | if ((delay[i] >= 9 && delay[i] <= 11) && | |
417 | /* Ok, we have found an adapter */ | |
418 | (setup_adapter(base[i], h, n) == 0)) | |
419 | n++; | |
420 | else | |
421 | release_region(base[i], | |
422 | hw[h].io_size); | |
423 | } | |
424 | ||
425 | } /* NUM_TYPES */ | |
426 | ||
427 | /* If any adapter was successfully initialized, return ok */ | |
428 | if (n) | |
429 | return 0; | |
430 | ||
431 | /* If no adapter found, return error */ | |
432 | printk(KERN_INFO "dmascc: no adapters found\n"); | |
433 | return -EIO; | |
434 | } | |
435 | ||
436 | module_init(dmascc_init); | |
437 | module_exit(dmascc_exit); | |
438 | ||
e2fdbc03 | 439 | static void __init dev_setup(struct net_device *dev) |
1da177e4 LT |
440 | { |
441 | dev->type = ARPHRD_AX25; | |
c4bc7ee2 | 442 | dev->hard_header_len = AX25_MAX_HEADER_LEN; |
1da177e4 | 443 | dev->mtu = 1500; |
c4bc7ee2 | 444 | dev->addr_len = AX25_ADDR_LEN; |
1da177e4 | 445 | dev->tx_queue_len = 64; |
c4bc7ee2 RB |
446 | memcpy(dev->broadcast, ax25_broadcast, AX25_ADDR_LEN); |
447 | memcpy(dev->dev_addr, ax25_test, AX25_ADDR_LEN); | |
1da177e4 LT |
448 | } |
449 | ||
450 | static int __init setup_adapter(int card_base, int type, int n) | |
451 | { | |
452 | int i, irq, chip; | |
453 | struct scc_info *info; | |
454 | struct net_device *dev; | |
455 | struct scc_priv *priv; | |
456 | unsigned long time; | |
457 | unsigned int irqs; | |
458 | int tmr_base = card_base + hw[type].tmr_offset; | |
459 | int scc_base = card_base + hw[type].scc_offset; | |
460 | char *chipnames[] = CHIPNAMES; | |
461 | ||
462 | /* Allocate memory */ | |
463 | info = kmalloc(sizeof(struct scc_info), GFP_KERNEL | GFP_DMA); | |
464 | if (!info) { | |
465 | printk(KERN_ERR "dmascc: " | |
466 | "could not allocate memory for %s at %#3x\n", | |
467 | hw[type].name, card_base); | |
468 | goto out; | |
469 | } | |
470 | ||
471 | /* Initialize what is necessary for write_scc and write_scc_data */ | |
472 | memset(info, 0, sizeof(struct scc_info)); | |
473 | ||
474 | info->dev[0] = alloc_netdev(0, "", dev_setup); | |
475 | if (!info->dev[0]) { | |
476 | printk(KERN_ERR "dmascc: " | |
477 | "could not allocate memory for %s at %#3x\n", | |
478 | hw[type].name, card_base); | |
479 | goto out1; | |
480 | } | |
481 | ||
482 | info->dev[1] = alloc_netdev(0, "", dev_setup); | |
483 | if (!info->dev[1]) { | |
484 | printk(KERN_ERR "dmascc: " | |
485 | "could not allocate memory for %s at %#3x\n", | |
486 | hw[type].name, card_base); | |
487 | goto out2; | |
488 | } | |
489 | spin_lock_init(&info->register_lock); | |
490 | ||
491 | priv = &info->priv[0]; | |
492 | priv->type = type; | |
493 | priv->card_base = card_base; | |
494 | priv->scc_cmd = scc_base + SCCA_CMD; | |
495 | priv->scc_data = scc_base + SCCA_DATA; | |
496 | priv->register_lock = &info->register_lock; | |
497 | ||
498 | /* Reset SCC */ | |
499 | write_scc(priv, R9, FHWRES | MIE | NV); | |
500 | ||
501 | /* Determine type of chip by enabling SDLC/HDLC enhancements */ | |
502 | write_scc(priv, R15, SHDLCE); | |
503 | if (!read_scc(priv, R15)) { | |
504 | /* WR7' not present. This is an ordinary Z8530 SCC. */ | |
505 | chip = Z8530; | |
506 | } else { | |
507 | /* Put one character in TX FIFO */ | |
508 | write_scc_data(priv, 0, 0); | |
509 | if (read_scc(priv, R0) & Tx_BUF_EMP) { | |
510 | /* TX FIFO not full. This is a Z85230 ESCC with a 4-byte FIFO. */ | |
511 | chip = Z85230; | |
512 | } else { | |
513 | /* TX FIFO full. This is a Z85C30 SCC with a 1-byte FIFO. */ | |
514 | chip = Z85C30; | |
515 | } | |
516 | } | |
517 | write_scc(priv, R15, 0); | |
518 | ||
519 | /* Start IRQ auto-detection */ | |
520 | irqs = probe_irq_on(); | |
521 | ||
522 | /* Enable interrupts */ | |
523 | if (type == TYPE_TWIN) { | |
524 | outb(0, card_base + TWIN_DMA_CFG); | |
525 | inb(card_base + TWIN_CLR_TMR1); | |
526 | inb(card_base + TWIN_CLR_TMR2); | |
527 | info->twin_serial_cfg = TWIN_EI; | |
528 | outb(info->twin_serial_cfg, card_base + TWIN_SERIAL_CFG); | |
529 | } else { | |
530 | write_scc(priv, R15, CTSIE); | |
531 | write_scc(priv, R0, RES_EXT_INT); | |
532 | write_scc(priv, R1, EXT_INT_ENAB); | |
533 | } | |
534 | ||
535 | /* Start timer */ | |
536 | outb(1, tmr_base + TMR_CNT1); | |
537 | outb(0, tmr_base + TMR_CNT1); | |
538 | ||
539 | /* Wait and detect IRQ */ | |
540 | time = jiffies; | |
541 | while (jiffies - time < 2 + HZ / TMR_0_HZ); | |
542 | irq = probe_irq_off(irqs); | |
543 | ||
544 | /* Clear pending interrupt, disable interrupts */ | |
545 | if (type == TYPE_TWIN) { | |
546 | inb(card_base + TWIN_CLR_TMR1); | |
547 | } else { | |
548 | write_scc(priv, R1, 0); | |
549 | write_scc(priv, R15, 0); | |
550 | write_scc(priv, R0, RES_EXT_INT); | |
551 | } | |
552 | ||
553 | if (irq <= 0) { | |
554 | printk(KERN_ERR | |
555 | "dmascc: could not find irq of %s at %#3x (irq=%d)\n", | |
556 | hw[type].name, card_base, irq); | |
557 | goto out3; | |
558 | } | |
559 | ||
560 | /* Set up data structures */ | |
561 | for (i = 0; i < 2; i++) { | |
562 | dev = info->dev[i]; | |
563 | priv = &info->priv[i]; | |
564 | priv->type = type; | |
565 | priv->chip = chip; | |
566 | priv->dev = dev; | |
567 | priv->info = info; | |
568 | priv->channel = i; | |
569 | spin_lock_init(&priv->ring_lock); | |
570 | priv->register_lock = &info->register_lock; | |
571 | priv->card_base = card_base; | |
572 | priv->scc_cmd = scc_base + (i ? SCCB_CMD : SCCA_CMD); | |
573 | priv->scc_data = scc_base + (i ? SCCB_DATA : SCCA_DATA); | |
574 | priv->tmr_cnt = tmr_base + (i ? TMR_CNT2 : TMR_CNT1); | |
575 | priv->tmr_ctrl = tmr_base + TMR_CTRL; | |
576 | priv->tmr_mode = i ? 0xb0 : 0x70; | |
577 | priv->param.pclk_hz = hw[type].pclk_hz; | |
578 | priv->param.brg_tc = -1; | |
579 | priv->param.clocks = TCTRxCP | RCRTxCP; | |
580 | priv->param.persist = 256; | |
581 | priv->param.dma = -1; | |
582 | INIT_WORK(&priv->rx_work, rx_bh, priv); | |
583 | dev->priv = priv; | |
584 | sprintf(dev->name, "dmascc%i", 2 * n + i); | |
1da177e4 LT |
585 | dev->base_addr = card_base; |
586 | dev->irq = irq; | |
587 | dev->open = scc_open; | |
588 | dev->stop = scc_close; | |
589 | dev->do_ioctl = scc_ioctl; | |
590 | dev->hard_start_xmit = scc_send_packet; | |
591 | dev->get_stats = scc_get_stats; | |
6f74998e | 592 | dev->hard_header = ax25_hard_header; |
1da177e4 LT |
593 | dev->rebuild_header = ax25_rebuild_header; |
594 | dev->set_mac_address = scc_set_mac_address; | |
595 | } | |
596 | if (register_netdev(info->dev[0])) { | |
597 | printk(KERN_ERR "dmascc: could not register %s\n", | |
598 | info->dev[0]->name); | |
599 | goto out3; | |
600 | } | |
601 | if (register_netdev(info->dev[1])) { | |
602 | printk(KERN_ERR "dmascc: could not register %s\n", | |
603 | info->dev[1]->name); | |
604 | goto out4; | |
605 | } | |
606 | ||
607 | ||
608 | info->next = first; | |
609 | first = info; | |
610 | printk(KERN_INFO "dmascc: found %s (%s) at %#3x, irq %d\n", | |
611 | hw[type].name, chipnames[chip], card_base, irq); | |
612 | return 0; | |
613 | ||
614 | out4: | |
615 | unregister_netdev(info->dev[0]); | |
616 | out3: | |
617 | if (info->priv[0].type == TYPE_TWIN) | |
618 | outb(0, info->dev[0]->base_addr + TWIN_SERIAL_CFG); | |
619 | write_scc(&info->priv[0], R9, FHWRES); | |
620 | free_netdev(info->dev[1]); | |
621 | out2: | |
622 | free_netdev(info->dev[0]); | |
623 | out1: | |
624 | kfree(info); | |
625 | out: | |
626 | return -1; | |
627 | } | |
628 | ||
629 | ||
630 | /* Driver functions */ | |
631 | ||
632 | static void write_scc(struct scc_priv *priv, int reg, int val) | |
633 | { | |
634 | unsigned long flags; | |
635 | switch (priv->type) { | |
636 | case TYPE_S5: | |
637 | if (reg) | |
638 | outb(reg, priv->scc_cmd); | |
639 | outb(val, priv->scc_cmd); | |
640 | return; | |
641 | case TYPE_TWIN: | |
642 | if (reg) | |
643 | outb_p(reg, priv->scc_cmd); | |
644 | outb_p(val, priv->scc_cmd); | |
645 | return; | |
646 | default: | |
647 | spin_lock_irqsave(priv->register_lock, flags); | |
648 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
649 | if (reg) | |
650 | outb_p(reg, priv->scc_cmd); | |
651 | outb_p(val, priv->scc_cmd); | |
652 | outb(1, priv->card_base + PI_DREQ_MASK); | |
653 | spin_unlock_irqrestore(priv->register_lock, flags); | |
654 | return; | |
655 | } | |
656 | } | |
657 | ||
658 | ||
659 | static void write_scc_data(struct scc_priv *priv, int val, int fast) | |
660 | { | |
661 | unsigned long flags; | |
662 | switch (priv->type) { | |
663 | case TYPE_S5: | |
664 | outb(val, priv->scc_data); | |
665 | return; | |
666 | case TYPE_TWIN: | |
667 | outb_p(val, priv->scc_data); | |
668 | return; | |
669 | default: | |
670 | if (fast) | |
671 | outb_p(val, priv->scc_data); | |
672 | else { | |
673 | spin_lock_irqsave(priv->register_lock, flags); | |
674 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
675 | outb_p(val, priv->scc_data); | |
676 | outb(1, priv->card_base + PI_DREQ_MASK); | |
677 | spin_unlock_irqrestore(priv->register_lock, flags); | |
678 | } | |
679 | return; | |
680 | } | |
681 | } | |
682 | ||
683 | ||
684 | static int read_scc(struct scc_priv *priv, int reg) | |
685 | { | |
686 | int rc; | |
687 | unsigned long flags; | |
688 | switch (priv->type) { | |
689 | case TYPE_S5: | |
690 | if (reg) | |
691 | outb(reg, priv->scc_cmd); | |
692 | return inb(priv->scc_cmd); | |
693 | case TYPE_TWIN: | |
694 | if (reg) | |
695 | outb_p(reg, priv->scc_cmd); | |
696 | return inb_p(priv->scc_cmd); | |
697 | default: | |
698 | spin_lock_irqsave(priv->register_lock, flags); | |
699 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
700 | if (reg) | |
701 | outb_p(reg, priv->scc_cmd); | |
702 | rc = inb_p(priv->scc_cmd); | |
703 | outb(1, priv->card_base + PI_DREQ_MASK); | |
704 | spin_unlock_irqrestore(priv->register_lock, flags); | |
705 | return rc; | |
706 | } | |
707 | } | |
708 | ||
709 | ||
710 | static int read_scc_data(struct scc_priv *priv) | |
711 | { | |
712 | int rc; | |
713 | unsigned long flags; | |
714 | switch (priv->type) { | |
715 | case TYPE_S5: | |
716 | return inb(priv->scc_data); | |
717 | case TYPE_TWIN: | |
718 | return inb_p(priv->scc_data); | |
719 | default: | |
720 | spin_lock_irqsave(priv->register_lock, flags); | |
721 | outb_p(0, priv->card_base + PI_DREQ_MASK); | |
722 | rc = inb_p(priv->scc_data); | |
723 | outb(1, priv->card_base + PI_DREQ_MASK); | |
724 | spin_unlock_irqrestore(priv->register_lock, flags); | |
725 | return rc; | |
726 | } | |
727 | } | |
728 | ||
729 | ||
730 | static int scc_open(struct net_device *dev) | |
731 | { | |
732 | struct scc_priv *priv = dev->priv; | |
733 | struct scc_info *info = priv->info; | |
734 | int card_base = priv->card_base; | |
735 | ||
736 | /* Request IRQ if not already used by other channel */ | |
737 | if (!info->irq_used) { | |
738 | if (request_irq(dev->irq, scc_isr, 0, "dmascc", info)) { | |
739 | return -EAGAIN; | |
740 | } | |
741 | } | |
742 | info->irq_used++; | |
743 | ||
744 | /* Request DMA if required */ | |
745 | if (priv->param.dma >= 0) { | |
746 | if (request_dma(priv->param.dma, "dmascc")) { | |
747 | if (--info->irq_used == 0) | |
748 | free_irq(dev->irq, info); | |
749 | return -EAGAIN; | |
750 | } else { | |
751 | unsigned long flags = claim_dma_lock(); | |
752 | clear_dma_ff(priv->param.dma); | |
753 | release_dma_lock(flags); | |
754 | } | |
755 | } | |
756 | ||
757 | /* Initialize local variables */ | |
758 | priv->rx_ptr = 0; | |
759 | priv->rx_over = 0; | |
760 | priv->rx_head = priv->rx_tail = priv->rx_count = 0; | |
761 | priv->state = IDLE; | |
762 | priv->tx_head = priv->tx_tail = priv->tx_count = 0; | |
763 | priv->tx_ptr = 0; | |
764 | ||
765 | /* Reset channel */ | |
766 | write_scc(priv, R9, (priv->channel ? CHRB : CHRA) | MIE | NV); | |
767 | /* X1 clock, SDLC mode */ | |
768 | write_scc(priv, R4, SDLC | X1CLK); | |
769 | /* DMA */ | |
770 | write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN); | |
771 | /* 8 bit RX char, RX disable */ | |
772 | write_scc(priv, R3, Rx8); | |
773 | /* 8 bit TX char, TX disable */ | |
774 | write_scc(priv, R5, Tx8); | |
775 | /* SDLC address field */ | |
776 | write_scc(priv, R6, 0); | |
777 | /* SDLC flag */ | |
778 | write_scc(priv, R7, FLAG); | |
779 | switch (priv->chip) { | |
780 | case Z85C30: | |
781 | /* Select WR7' */ | |
782 | write_scc(priv, R15, SHDLCE); | |
783 | /* Auto EOM reset */ | |
784 | write_scc(priv, R7, AUTOEOM); | |
785 | write_scc(priv, R15, 0); | |
786 | break; | |
787 | case Z85230: | |
788 | /* Select WR7' */ | |
789 | write_scc(priv, R15, SHDLCE); | |
790 | /* The following bits are set (see 2.5.2.1): | |
791 | - Automatic EOM reset | |
792 | - Interrupt request if RX FIFO is half full | |
793 | This bit should be ignored in DMA mode (according to the | |
794 | documentation), but actually isn't. The receiver doesn't work if | |
795 | it is set. Thus, we have to clear it in DMA mode. | |
796 | - Interrupt/DMA request if TX FIFO is completely empty | |
797 | a) If set, the ESCC behaves as if it had no TX FIFO (Z85C30 | |
798 | compatibility). | |
799 | b) If cleared, DMA requests may follow each other very quickly, | |
800 | filling up the TX FIFO. | |
801 | Advantage: TX works even in case of high bus latency. | |
802 | Disadvantage: Edge-triggered DMA request circuitry may miss | |
803 | a request. No more data is delivered, resulting | |
804 | in a TX FIFO underrun. | |
805 | Both PI2 and S5SCC/DMA seem to work fine with TXFIFOE cleared. | |
806 | The PackeTwin doesn't. I don't know about the PI, but let's | |
807 | assume it behaves like the PI2. | |
808 | */ | |
809 | if (priv->param.dma >= 0) { | |
810 | if (priv->type == TYPE_TWIN) | |
811 | write_scc(priv, R7, AUTOEOM | TXFIFOE); | |
812 | else | |
813 | write_scc(priv, R7, AUTOEOM); | |
814 | } else { | |
815 | write_scc(priv, R7, AUTOEOM | RXFIFOH); | |
816 | } | |
817 | write_scc(priv, R15, 0); | |
818 | break; | |
819 | } | |
820 | /* Preset CRC, NRZ(I) encoding */ | |
821 | write_scc(priv, R10, CRCPS | (priv->param.nrzi ? NRZI : NRZ)); | |
822 | ||
823 | /* Configure baud rate generator */ | |
824 | if (priv->param.brg_tc >= 0) { | |
825 | /* Program BR generator */ | |
826 | write_scc(priv, R12, priv->param.brg_tc & 0xFF); | |
827 | write_scc(priv, R13, (priv->param.brg_tc >> 8) & 0xFF); | |
828 | /* BRG source = SYS CLK; enable BRG; DTR REQ function (required by | |
829 | PackeTwin, not connected on the PI2); set DPLL source to BRG */ | |
830 | write_scc(priv, R14, SSBR | DTRREQ | BRSRC | BRENABL); | |
831 | /* Enable DPLL */ | |
832 | write_scc(priv, R14, SEARCH | DTRREQ | BRSRC | BRENABL); | |
833 | } else { | |
834 | /* Disable BR generator */ | |
835 | write_scc(priv, R14, DTRREQ | BRSRC); | |
836 | } | |
837 | ||
838 | /* Configure clocks */ | |
839 | if (priv->type == TYPE_TWIN) { | |
840 | /* Disable external TX clock receiver */ | |
841 | outb((info->twin_serial_cfg &= | |
842 | ~(priv->channel ? TWIN_EXTCLKB : TWIN_EXTCLKA)), | |
843 | card_base + TWIN_SERIAL_CFG); | |
844 | } | |
845 | write_scc(priv, R11, priv->param.clocks); | |
846 | if ((priv->type == TYPE_TWIN) && !(priv->param.clocks & TRxCOI)) { | |
847 | /* Enable external TX clock receiver */ | |
848 | outb((info->twin_serial_cfg |= | |
849 | (priv->channel ? TWIN_EXTCLKB : TWIN_EXTCLKA)), | |
850 | card_base + TWIN_SERIAL_CFG); | |
851 | } | |
852 | ||
853 | /* Configure PackeTwin */ | |
854 | if (priv->type == TYPE_TWIN) { | |
855 | /* Assert DTR, enable interrupts */ | |
856 | outb((info->twin_serial_cfg |= TWIN_EI | | |
857 | (priv->channel ? TWIN_DTRB_ON : TWIN_DTRA_ON)), | |
858 | card_base + TWIN_SERIAL_CFG); | |
859 | } | |
860 | ||
861 | /* Read current status */ | |
862 | priv->rr0 = read_scc(priv, R0); | |
863 | /* Enable DCD interrupt */ | |
864 | write_scc(priv, R15, DCDIE); | |
865 | ||
866 | netif_start_queue(dev); | |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
871 | ||
872 | static int scc_close(struct net_device *dev) | |
873 | { | |
874 | struct scc_priv *priv = dev->priv; | |
875 | struct scc_info *info = priv->info; | |
876 | int card_base = priv->card_base; | |
877 | ||
878 | netif_stop_queue(dev); | |
879 | ||
880 | if (priv->type == TYPE_TWIN) { | |
881 | /* Drop DTR */ | |
882 | outb((info->twin_serial_cfg &= | |
883 | (priv->channel ? ~TWIN_DTRB_ON : ~TWIN_DTRA_ON)), | |
884 | card_base + TWIN_SERIAL_CFG); | |
885 | } | |
886 | ||
887 | /* Reset channel, free DMA and IRQ */ | |
888 | write_scc(priv, R9, (priv->channel ? CHRB : CHRA) | MIE | NV); | |
889 | if (priv->param.dma >= 0) { | |
890 | if (priv->type == TYPE_TWIN) | |
891 | outb(0, card_base + TWIN_DMA_CFG); | |
892 | free_dma(priv->param.dma); | |
893 | } | |
894 | if (--info->irq_used == 0) | |
895 | free_irq(dev->irq, info); | |
896 | ||
897 | return 0; | |
898 | } | |
899 | ||
900 | ||
901 | static int scc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
902 | { | |
903 | struct scc_priv *priv = dev->priv; | |
904 | ||
905 | switch (cmd) { | |
906 | case SIOCGSCCPARAM: | |
907 | if (copy_to_user | |
908 | (ifr->ifr_data, &priv->param, | |
909 | sizeof(struct scc_param))) | |
910 | return -EFAULT; | |
911 | return 0; | |
912 | case SIOCSSCCPARAM: | |
913 | if (!capable(CAP_NET_ADMIN)) | |
914 | return -EPERM; | |
915 | if (netif_running(dev)) | |
916 | return -EAGAIN; | |
917 | if (copy_from_user | |
918 | (&priv->param, ifr->ifr_data, | |
919 | sizeof(struct scc_param))) | |
920 | return -EFAULT; | |
921 | return 0; | |
922 | default: | |
923 | return -EINVAL; | |
924 | } | |
925 | } | |
926 | ||
927 | ||
928 | static int scc_send_packet(struct sk_buff *skb, struct net_device *dev) | |
929 | { | |
930 | struct scc_priv *priv = dev->priv; | |
931 | unsigned long flags; | |
932 | int i; | |
933 | ||
934 | /* Temporarily stop the scheduler feeding us packets */ | |
935 | netif_stop_queue(dev); | |
936 | ||
937 | /* Transfer data to DMA buffer */ | |
938 | i = priv->tx_head; | |
939 | memcpy(priv->tx_buf[i], skb->data + 1, skb->len - 1); | |
940 | priv->tx_len[i] = skb->len - 1; | |
941 | ||
942 | /* Clear interrupts while we touch our circular buffers */ | |
943 | ||
944 | spin_lock_irqsave(&priv->ring_lock, flags); | |
945 | /* Move the ring buffer's head */ | |
946 | priv->tx_head = (i + 1) % NUM_TX_BUF; | |
947 | priv->tx_count++; | |
948 | ||
949 | /* If we just filled up the last buffer, leave queue stopped. | |
950 | The higher layers must wait until we have a DMA buffer | |
951 | to accept the data. */ | |
952 | if (priv->tx_count < NUM_TX_BUF) | |
953 | netif_wake_queue(dev); | |
954 | ||
955 | /* Set new TX state */ | |
956 | if (priv->state == IDLE) { | |
957 | /* Assert RTS, start timer */ | |
958 | priv->state = TX_HEAD; | |
959 | priv->tx_start = jiffies; | |
960 | write_scc(priv, R5, TxCRC_ENAB | RTS | TxENAB | Tx8); | |
961 | write_scc(priv, R15, 0); | |
962 | start_timer(priv, priv->param.txdelay, 0); | |
963 | } | |
964 | ||
965 | /* Turn interrupts back on and free buffer */ | |
966 | spin_unlock_irqrestore(&priv->ring_lock, flags); | |
967 | dev_kfree_skb(skb); | |
968 | ||
969 | return 0; | |
970 | } | |
971 | ||
972 | ||
973 | static struct net_device_stats *scc_get_stats(struct net_device *dev) | |
974 | { | |
975 | struct scc_priv *priv = dev->priv; | |
976 | ||
977 | return &priv->stats; | |
978 | } | |
979 | ||
980 | ||
981 | static int scc_set_mac_address(struct net_device *dev, void *sa) | |
982 | { | |
983 | memcpy(dev->dev_addr, ((struct sockaddr *) sa)->sa_data, | |
984 | dev->addr_len); | |
985 | return 0; | |
986 | } | |
987 | ||
988 | ||
989 | static inline void tx_on(struct scc_priv *priv) | |
990 | { | |
991 | int i, n; | |
992 | unsigned long flags; | |
993 | ||
994 | if (priv->param.dma >= 0) { | |
995 | n = (priv->chip == Z85230) ? 3 : 1; | |
996 | /* Program DMA controller */ | |
997 | flags = claim_dma_lock(); | |
998 | set_dma_mode(priv->param.dma, DMA_MODE_WRITE); | |
999 | set_dma_addr(priv->param.dma, | |
1000 | (int) priv->tx_buf[priv->tx_tail] + n); | |
1001 | set_dma_count(priv->param.dma, | |
1002 | priv->tx_len[priv->tx_tail] - n); | |
1003 | release_dma_lock(flags); | |
1004 | /* Enable TX underrun interrupt */ | |
1005 | write_scc(priv, R15, TxUIE); | |
1006 | /* Configure DREQ */ | |
1007 | if (priv->type == TYPE_TWIN) | |
1008 | outb((priv->param.dma == | |
1009 | 1) ? TWIN_DMA_HDX_T1 : TWIN_DMA_HDX_T3, | |
1010 | priv->card_base + TWIN_DMA_CFG); | |
1011 | else | |
1012 | write_scc(priv, R1, | |
1013 | EXT_INT_ENAB | WT_FN_RDYFN | | |
1014 | WT_RDY_ENAB); | |
1015 | /* Write first byte(s) */ | |
1016 | spin_lock_irqsave(priv->register_lock, flags); | |
1017 | for (i = 0; i < n; i++) | |
1018 | write_scc_data(priv, | |
1019 | priv->tx_buf[priv->tx_tail][i], 1); | |
1020 | enable_dma(priv->param.dma); | |
1021 | spin_unlock_irqrestore(priv->register_lock, flags); | |
1022 | } else { | |
1023 | write_scc(priv, R15, TxUIE); | |
1024 | write_scc(priv, R1, | |
1025 | EXT_INT_ENAB | WT_FN_RDYFN | TxINT_ENAB); | |
1026 | tx_isr(priv); | |
1027 | } | |
1028 | /* Reset EOM latch if we do not have the AUTOEOM feature */ | |
1029 | if (priv->chip == Z8530) | |
1030 | write_scc(priv, R0, RES_EOM_L); | |
1031 | } | |
1032 | ||
1033 | ||
1034 | static inline void rx_on(struct scc_priv *priv) | |
1035 | { | |
1036 | unsigned long flags; | |
1037 | ||
1038 | /* Clear RX FIFO */ | |
1039 | while (read_scc(priv, R0) & Rx_CH_AV) | |
1040 | read_scc_data(priv); | |
1041 | priv->rx_over = 0; | |
1042 | if (priv->param.dma >= 0) { | |
1043 | /* Program DMA controller */ | |
1044 | flags = claim_dma_lock(); | |
1045 | set_dma_mode(priv->param.dma, DMA_MODE_READ); | |
1046 | set_dma_addr(priv->param.dma, | |
1047 | (int) priv->rx_buf[priv->rx_head]); | |
1048 | set_dma_count(priv->param.dma, BUF_SIZE); | |
1049 | release_dma_lock(flags); | |
1050 | enable_dma(priv->param.dma); | |
1051 | /* Configure PackeTwin DMA */ | |
1052 | if (priv->type == TYPE_TWIN) { | |
1053 | outb((priv->param.dma == | |
1054 | 1) ? TWIN_DMA_HDX_R1 : TWIN_DMA_HDX_R3, | |
1055 | priv->card_base + TWIN_DMA_CFG); | |
1056 | } | |
1057 | /* Sp. cond. intr. only, ext int enable, RX DMA enable */ | |
1058 | write_scc(priv, R1, EXT_INT_ENAB | INT_ERR_Rx | | |
1059 | WT_RDY_RT | WT_FN_RDYFN | WT_RDY_ENAB); | |
1060 | } else { | |
1061 | /* Reset current frame */ | |
1062 | priv->rx_ptr = 0; | |
1063 | /* Intr. on all Rx characters and Sp. cond., ext int enable */ | |
1064 | write_scc(priv, R1, EXT_INT_ENAB | INT_ALL_Rx | WT_RDY_RT | | |
1065 | WT_FN_RDYFN); | |
1066 | } | |
1067 | write_scc(priv, R0, ERR_RES); | |
1068 | write_scc(priv, R3, RxENABLE | Rx8 | RxCRC_ENAB); | |
1069 | } | |
1070 | ||
1071 | ||
1072 | static inline void rx_off(struct scc_priv *priv) | |
1073 | { | |
1074 | /* Disable receiver */ | |
1075 | write_scc(priv, R3, Rx8); | |
1076 | /* Disable DREQ / RX interrupt */ | |
1077 | if (priv->param.dma >= 0 && priv->type == TYPE_TWIN) | |
1078 | outb(0, priv->card_base + TWIN_DMA_CFG); | |
1079 | else | |
1080 | write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN); | |
1081 | /* Disable DMA */ | |
1082 | if (priv->param.dma >= 0) | |
1083 | disable_dma(priv->param.dma); | |
1084 | } | |
1085 | ||
1086 | ||
1087 | static void start_timer(struct scc_priv *priv, int t, int r15) | |
1088 | { | |
1089 | unsigned long flags; | |
1090 | ||
1091 | outb(priv->tmr_mode, priv->tmr_ctrl); | |
1092 | if (t == 0) { | |
1093 | tm_isr(priv); | |
1094 | } else if (t > 0) { | |
1095 | save_flags(flags); | |
1096 | cli(); | |
1097 | outb(t & 0xFF, priv->tmr_cnt); | |
1098 | outb((t >> 8) & 0xFF, priv->tmr_cnt); | |
1099 | if (priv->type != TYPE_TWIN) { | |
1100 | write_scc(priv, R15, r15 | CTSIE); | |
1101 | priv->rr0 |= CTS; | |
1102 | } | |
1103 | restore_flags(flags); | |
1104 | } | |
1105 | } | |
1106 | ||
1107 | ||
1108 | static inline unsigned char random(void) | |
1109 | { | |
1110 | /* See "Numerical Recipes in C", second edition, p. 284 */ | |
1111 | rand = rand * 1664525L + 1013904223L; | |
1112 | return (unsigned char) (rand >> 24); | |
1113 | } | |
1114 | ||
1115 | static inline void z8530_isr(struct scc_info *info) | |
1116 | { | |
1117 | int is, i = 100; | |
1118 | ||
1119 | while ((is = read_scc(&info->priv[0], R3)) && i--) { | |
1120 | if (is & CHARxIP) { | |
1121 | rx_isr(&info->priv[0]); | |
1122 | } else if (is & CHATxIP) { | |
1123 | tx_isr(&info->priv[0]); | |
1124 | } else if (is & CHAEXT) { | |
1125 | es_isr(&info->priv[0]); | |
1126 | } else if (is & CHBRxIP) { | |
1127 | rx_isr(&info->priv[1]); | |
1128 | } else if (is & CHBTxIP) { | |
1129 | tx_isr(&info->priv[1]); | |
1130 | } else { | |
1131 | es_isr(&info->priv[1]); | |
1132 | } | |
1133 | write_scc(&info->priv[0], R0, RES_H_IUS); | |
1134 | i++; | |
1135 | } | |
1136 | if (i < 0) { | |
1137 | printk(KERN_ERR "dmascc: stuck in ISR with RR3=0x%02x.\n", | |
1138 | is); | |
1139 | } | |
1140 | /* Ok, no interrupts pending from this 8530. The INT line should | |
1141 | be inactive now. */ | |
1142 | } | |
1143 | ||
1144 | ||
7d12e780 | 1145 | static irqreturn_t scc_isr(int irq, void *dev_id) |
1da177e4 LT |
1146 | { |
1147 | struct scc_info *info = dev_id; | |
1148 | ||
1149 | spin_lock(info->priv[0].register_lock); | |
1150 | /* At this point interrupts are enabled, and the interrupt under service | |
1151 | is already acknowledged, but masked off. | |
1152 | ||
1153 | Interrupt processing: We loop until we know that the IRQ line is | |
1154 | low. If another positive edge occurs afterwards during the ISR, | |
1155 | another interrupt will be triggered by the interrupt controller | |
1156 | as soon as the IRQ level is enabled again (see asm/irq.h). | |
1157 | ||
1158 | Bottom-half handlers will be processed after scc_isr(). This is | |
1159 | important, since we only have small ringbuffers and want new data | |
1160 | to be fetched/delivered immediately. */ | |
1161 | ||
1162 | if (info->priv[0].type == TYPE_TWIN) { | |
1163 | int is, card_base = info->priv[0].card_base; | |
1164 | while ((is = ~inb(card_base + TWIN_INT_REG)) & | |
1165 | TWIN_INT_MSK) { | |
1166 | if (is & TWIN_SCC_MSK) { | |
1167 | z8530_isr(info); | |
1168 | } else if (is & TWIN_TMR1_MSK) { | |
1169 | inb(card_base + TWIN_CLR_TMR1); | |
1170 | tm_isr(&info->priv[0]); | |
1171 | } else { | |
1172 | inb(card_base + TWIN_CLR_TMR2); | |
1173 | tm_isr(&info->priv[1]); | |
1174 | } | |
1175 | } | |
1176 | } else | |
1177 | z8530_isr(info); | |
1178 | spin_unlock(info->priv[0].register_lock); | |
1179 | return IRQ_HANDLED; | |
1180 | } | |
1181 | ||
1182 | ||
1183 | static void rx_isr(struct scc_priv *priv) | |
1184 | { | |
1185 | if (priv->param.dma >= 0) { | |
1186 | /* Check special condition and perform error reset. See 2.4.7.5. */ | |
1187 | special_condition(priv, read_scc(priv, R1)); | |
1188 | write_scc(priv, R0, ERR_RES); | |
1189 | } else { | |
1190 | /* Check special condition for each character. Error reset not necessary. | |
1191 | Same algorithm for SCC and ESCC. See 2.4.7.1 and 2.4.7.4. */ | |
1192 | int rc; | |
1193 | while (read_scc(priv, R0) & Rx_CH_AV) { | |
1194 | rc = read_scc(priv, R1); | |
1195 | if (priv->rx_ptr < BUF_SIZE) | |
1196 | priv->rx_buf[priv->rx_head][priv-> | |
1197 | rx_ptr++] = | |
1198 | read_scc_data(priv); | |
1199 | else { | |
1200 | priv->rx_over = 2; | |
1201 | read_scc_data(priv); | |
1202 | } | |
1203 | special_condition(priv, rc); | |
1204 | } | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | ||
1209 | static void special_condition(struct scc_priv *priv, int rc) | |
1210 | { | |
1211 | int cb; | |
1212 | unsigned long flags; | |
1213 | ||
1214 | /* See Figure 2-15. Only overrun and EOF need to be checked. */ | |
1215 | ||
1216 | if (rc & Rx_OVR) { | |
1217 | /* Receiver overrun */ | |
1218 | priv->rx_over = 1; | |
1219 | if (priv->param.dma < 0) | |
1220 | write_scc(priv, R0, ERR_RES); | |
1221 | } else if (rc & END_FR) { | |
1222 | /* End of frame. Get byte count */ | |
1223 | if (priv->param.dma >= 0) { | |
1224 | flags = claim_dma_lock(); | |
1225 | cb = BUF_SIZE - get_dma_residue(priv->param.dma) - | |
1226 | 2; | |
1227 | release_dma_lock(flags); | |
1228 | } else { | |
1229 | cb = priv->rx_ptr - 2; | |
1230 | } | |
1231 | if (priv->rx_over) { | |
1232 | /* We had an overrun */ | |
1233 | priv->stats.rx_errors++; | |
1234 | if (priv->rx_over == 2) | |
1235 | priv->stats.rx_length_errors++; | |
1236 | else | |
1237 | priv->stats.rx_fifo_errors++; | |
1238 | priv->rx_over = 0; | |
1239 | } else if (rc & CRC_ERR) { | |
1240 | /* Count invalid CRC only if packet length >= minimum */ | |
1241 | if (cb >= 15) { | |
1242 | priv->stats.rx_errors++; | |
1243 | priv->stats.rx_crc_errors++; | |
1244 | } | |
1245 | } else { | |
1246 | if (cb >= 15) { | |
1247 | if (priv->rx_count < NUM_RX_BUF - 1) { | |
1248 | /* Put good frame in FIFO */ | |
1249 | priv->rx_len[priv->rx_head] = cb; | |
1250 | priv->rx_head = | |
1251 | (priv->rx_head + | |
1252 | 1) % NUM_RX_BUF; | |
1253 | priv->rx_count++; | |
1254 | schedule_work(&priv->rx_work); | |
1255 | } else { | |
1256 | priv->stats.rx_errors++; | |
1257 | priv->stats.rx_over_errors++; | |
1258 | } | |
1259 | } | |
1260 | } | |
1261 | /* Get ready for new frame */ | |
1262 | if (priv->param.dma >= 0) { | |
1263 | flags = claim_dma_lock(); | |
1264 | set_dma_addr(priv->param.dma, | |
1265 | (int) priv->rx_buf[priv->rx_head]); | |
1266 | set_dma_count(priv->param.dma, BUF_SIZE); | |
1267 | release_dma_lock(flags); | |
1268 | } else { | |
1269 | priv->rx_ptr = 0; | |
1270 | } | |
1271 | } | |
1272 | } | |
1273 | ||
1274 | ||
1275 | static void rx_bh(void *arg) | |
1276 | { | |
1277 | struct scc_priv *priv = arg; | |
1278 | int i = priv->rx_tail; | |
1279 | int cb; | |
1280 | unsigned long flags; | |
1281 | struct sk_buff *skb; | |
1282 | unsigned char *data; | |
1283 | ||
1284 | spin_lock_irqsave(&priv->ring_lock, flags); | |
1285 | while (priv->rx_count) { | |
1286 | spin_unlock_irqrestore(&priv->ring_lock, flags); | |
1287 | cb = priv->rx_len[i]; | |
1288 | /* Allocate buffer */ | |
1289 | skb = dev_alloc_skb(cb + 1); | |
1290 | if (skb == NULL) { | |
1291 | /* Drop packet */ | |
1292 | priv->stats.rx_dropped++; | |
1293 | } else { | |
1294 | /* Fill buffer */ | |
1295 | data = skb_put(skb, cb + 1); | |
1296 | data[0] = 0; | |
1297 | memcpy(&data[1], priv->rx_buf[i], cb); | |
56cb5156 | 1298 | skb->protocol = ax25_type_trans(skb, priv->dev); |
1da177e4 LT |
1299 | netif_rx(skb); |
1300 | priv->dev->last_rx = jiffies; | |
1301 | priv->stats.rx_packets++; | |
1302 | priv->stats.rx_bytes += cb; | |
1303 | } | |
1304 | spin_lock_irqsave(&priv->ring_lock, flags); | |
1305 | /* Move tail */ | |
1306 | priv->rx_tail = i = (i + 1) % NUM_RX_BUF; | |
1307 | priv->rx_count--; | |
1308 | } | |
1309 | spin_unlock_irqrestore(&priv->ring_lock, flags); | |
1310 | } | |
1311 | ||
1312 | ||
1313 | static void tx_isr(struct scc_priv *priv) | |
1314 | { | |
1315 | int i = priv->tx_tail, p = priv->tx_ptr; | |
1316 | ||
1317 | /* Suspend TX interrupts if we don't want to send anything. | |
1318 | See Figure 2-22. */ | |
1319 | if (p == priv->tx_len[i]) { | |
1320 | write_scc(priv, R0, RES_Tx_P); | |
1321 | return; | |
1322 | } | |
1323 | ||
1324 | /* Write characters */ | |
1325 | while ((read_scc(priv, R0) & Tx_BUF_EMP) && p < priv->tx_len[i]) { | |
1326 | write_scc_data(priv, priv->tx_buf[i][p++], 0); | |
1327 | } | |
1328 | ||
1329 | /* Reset EOM latch of Z8530 */ | |
1330 | if (!priv->tx_ptr && p && priv->chip == Z8530) | |
1331 | write_scc(priv, R0, RES_EOM_L); | |
1332 | ||
1333 | priv->tx_ptr = p; | |
1334 | } | |
1335 | ||
1336 | ||
1337 | static void es_isr(struct scc_priv *priv) | |
1338 | { | |
1339 | int i, rr0, drr0, res; | |
1340 | unsigned long flags; | |
1341 | ||
1342 | /* Read status, reset interrupt bit (open latches) */ | |
1343 | rr0 = read_scc(priv, R0); | |
1344 | write_scc(priv, R0, RES_EXT_INT); | |
1345 | drr0 = priv->rr0 ^ rr0; | |
1346 | priv->rr0 = rr0; | |
1347 | ||
1348 | /* Transmit underrun (2.4.9.6). We can't check the TxEOM flag, since | |
1349 | it might have already been cleared again by AUTOEOM. */ | |
1350 | if (priv->state == TX_DATA) { | |
1351 | /* Get remaining bytes */ | |
1352 | i = priv->tx_tail; | |
1353 | if (priv->param.dma >= 0) { | |
1354 | disable_dma(priv->param.dma); | |
1355 | flags = claim_dma_lock(); | |
1356 | res = get_dma_residue(priv->param.dma); | |
1357 | release_dma_lock(flags); | |
1358 | } else { | |
1359 | res = priv->tx_len[i] - priv->tx_ptr; | |
1360 | priv->tx_ptr = 0; | |
1361 | } | |
1362 | /* Disable DREQ / TX interrupt */ | |
1363 | if (priv->param.dma >= 0 && priv->type == TYPE_TWIN) | |
1364 | outb(0, priv->card_base + TWIN_DMA_CFG); | |
1365 | else | |
1366 | write_scc(priv, R1, EXT_INT_ENAB | WT_FN_RDYFN); | |
1367 | if (res) { | |
1368 | /* Update packet statistics */ | |
1369 | priv->stats.tx_errors++; | |
1370 | priv->stats.tx_fifo_errors++; | |
1371 | /* Other underrun interrupts may already be waiting */ | |
1372 | write_scc(priv, R0, RES_EXT_INT); | |
1373 | write_scc(priv, R0, RES_EXT_INT); | |
1374 | } else { | |
1375 | /* Update packet statistics */ | |
1376 | priv->stats.tx_packets++; | |
1377 | priv->stats.tx_bytes += priv->tx_len[i]; | |
1378 | /* Remove frame from FIFO */ | |
1379 | priv->tx_tail = (i + 1) % NUM_TX_BUF; | |
1380 | priv->tx_count--; | |
1381 | /* Inform upper layers */ | |
1382 | netif_wake_queue(priv->dev); | |
1383 | } | |
1384 | /* Switch state */ | |
1385 | write_scc(priv, R15, 0); | |
1386 | if (priv->tx_count && | |
1387 | (jiffies - priv->tx_start) < priv->param.txtimeout) { | |
1388 | priv->state = TX_PAUSE; | |
1389 | start_timer(priv, priv->param.txpause, 0); | |
1390 | } else { | |
1391 | priv->state = TX_TAIL; | |
1392 | start_timer(priv, priv->param.txtail, 0); | |
1393 | } | |
1394 | } | |
1395 | ||
1396 | /* DCD transition */ | |
1397 | if (drr0 & DCD) { | |
1398 | if (rr0 & DCD) { | |
1399 | switch (priv->state) { | |
1400 | case IDLE: | |
1401 | case WAIT: | |
1402 | priv->state = DCD_ON; | |
1403 | write_scc(priv, R15, 0); | |
1404 | start_timer(priv, priv->param.dcdon, 0); | |
1405 | } | |
1406 | } else { | |
1407 | switch (priv->state) { | |
1408 | case RX_ON: | |
1409 | rx_off(priv); | |
1410 | priv->state = DCD_OFF; | |
1411 | write_scc(priv, R15, 0); | |
1412 | start_timer(priv, priv->param.dcdoff, 0); | |
1413 | } | |
1414 | } | |
1415 | } | |
1416 | ||
1417 | /* CTS transition */ | |
1418 | if ((drr0 & CTS) && (~rr0 & CTS) && priv->type != TYPE_TWIN) | |
1419 | tm_isr(priv); | |
1420 | ||
1421 | } | |
1422 | ||
1423 | ||
1424 | static void tm_isr(struct scc_priv *priv) | |
1425 | { | |
1426 | switch (priv->state) { | |
1427 | case TX_HEAD: | |
1428 | case TX_PAUSE: | |
1429 | tx_on(priv); | |
1430 | priv->state = TX_DATA; | |
1431 | break; | |
1432 | case TX_TAIL: | |
1433 | write_scc(priv, R5, TxCRC_ENAB | Tx8); | |
1434 | priv->state = RTS_OFF; | |
1435 | if (priv->type != TYPE_TWIN) | |
1436 | write_scc(priv, R15, 0); | |
1437 | start_timer(priv, priv->param.rtsoff, 0); | |
1438 | break; | |
1439 | case RTS_OFF: | |
1440 | write_scc(priv, R15, DCDIE); | |
1441 | priv->rr0 = read_scc(priv, R0); | |
1442 | if (priv->rr0 & DCD) { | |
1443 | priv->stats.collisions++; | |
1444 | rx_on(priv); | |
1445 | priv->state = RX_ON; | |
1446 | } else { | |
1447 | priv->state = WAIT; | |
1448 | start_timer(priv, priv->param.waittime, DCDIE); | |
1449 | } | |
1450 | break; | |
1451 | case WAIT: | |
1452 | if (priv->tx_count) { | |
1453 | priv->state = TX_HEAD; | |
1454 | priv->tx_start = jiffies; | |
1455 | write_scc(priv, R5, | |
1456 | TxCRC_ENAB | RTS | TxENAB | Tx8); | |
1457 | write_scc(priv, R15, 0); | |
1458 | start_timer(priv, priv->param.txdelay, 0); | |
1459 | } else { | |
1460 | priv->state = IDLE; | |
1461 | if (priv->type != TYPE_TWIN) | |
1462 | write_scc(priv, R15, DCDIE); | |
1463 | } | |
1464 | break; | |
1465 | case DCD_ON: | |
1466 | case DCD_OFF: | |
1467 | write_scc(priv, R15, DCDIE); | |
1468 | priv->rr0 = read_scc(priv, R0); | |
1469 | if (priv->rr0 & DCD) { | |
1470 | rx_on(priv); | |
1471 | priv->state = RX_ON; | |
1472 | } else { | |
1473 | priv->state = WAIT; | |
1474 | start_timer(priv, | |
1475 | random() / priv->param.persist * | |
1476 | priv->param.slottime, DCDIE); | |
1477 | } | |
1478 | break; | |
1479 | } | |
1480 | } |