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1/* SPDX-License-Identifier: GPL-2.0-only */
2.psize 0
3/*
4 wanXL serial card driver for Linux
5 card firmware part
6
7 Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>
8
9
10
11
12
13 DPRAM BDs:
14 0x000 - 0x050 TX#0 0x050 - 0x140 RX#0
15 0x140 - 0x190 TX#1 0x190 - 0x280 RX#1
16 0x280 - 0x2D0 TX#2 0x2D0 - 0x3C0 RX#2
17 0x3C0 - 0x410 TX#3 0x410 - 0x500 RX#3
18
19
20 000 5FF 1536 Bytes Dual-Port RAM User Data / BDs
21 600 6FF 256 Bytes Dual-Port RAM User Data / BDs
22 700 7FF 256 Bytes Dual-Port RAM User Data / BDs
23 C00 CBF 192 Bytes Dual-Port RAM Parameter RAM Page 1
24 D00 DBF 192 Bytes Dual-Port RAM Parameter RAM Page 2
25 E00 EBF 192 Bytes Dual-Port RAM Parameter RAM Page 3
26 F00 FBF 192 Bytes Dual-Port RAM Parameter RAM Page 4
27
28 local interrupts level
29 NMI 7
30 PIT timer, CPM (RX/TX complete) 4
31 PCI9060 DMA and PCI doorbells 3
32 Cable - not used 1
33*/
34
35#include <linux/hdlc.h>
36#include <linux/hdlc/ioctl.h>
37#include "wanxl.h"
38
39/* memory addresses and offsets */
40
41MAX_RAM_SIZE = 16 * 1024 * 1024 // max RAM supported by hardware
42
43PCI9060_VECTOR = 0x0000006C
44CPM_IRQ_BASE = 0x40
45ERROR_VECTOR = CPM_IRQ_BASE * 4
46SCC1_VECTOR = (CPM_IRQ_BASE + 0x1E) * 4
47SCC2_VECTOR = (CPM_IRQ_BASE + 0x1D) * 4
48SCC3_VECTOR = (CPM_IRQ_BASE + 0x1C) * 4
49SCC4_VECTOR = (CPM_IRQ_BASE + 0x1B) * 4
50CPM_IRQ_LEVEL = 4
51TIMER_IRQ = 128
52TIMER_IRQ_LEVEL = 4
53PITR_CONST = 0x100 + 16 // 1 Hz timer
54
55MBAR = 0x0003FF00
56
57VALUE_WINDOW = 0x40000000
58ORDER_WINDOW = 0xC0000000
59
60PLX = 0xFFF90000
61
62CSRA = 0xFFFB0000
63CSRB = 0xFFFB0002
64CSRC = 0xFFFB0004
65CSRD = 0xFFFB0006
66STATUS_CABLE_LL = 0x2000
67STATUS_CABLE_DTR = 0x1000
68
69DPRBASE = 0xFFFC0000
70
71SCC1_BASE = DPRBASE + 0xC00
72MISC_BASE = DPRBASE + 0xCB0
73SCC2_BASE = DPRBASE + 0xD00
74SCC3_BASE = DPRBASE + 0xE00
75SCC4_BASE = DPRBASE + 0xF00
76
77// offset from SCCx_BASE
78// SCC_xBASE contain offsets from DPRBASE and must be divisible by 8
79SCC_RBASE = 0 // 16-bit RxBD base address
80SCC_TBASE = 2 // 16-bit TxBD base address
81SCC_RFCR = 4 // 8-bit Rx function code
82SCC_TFCR = 5 // 8-bit Tx function code
83SCC_MRBLR = 6 // 16-bit maximum Rx buffer length
84SCC_C_MASK = 0x34 // 32-bit CRC constant
85SCC_C_PRES = 0x38 // 32-bit CRC preset
86SCC_MFLR = 0x46 // 16-bit max Rx frame length (without flags)
87
88REGBASE = DPRBASE + 0x1000
89PICR = REGBASE + 0x026 // 16-bit periodic irq control
90PITR = REGBASE + 0x02A // 16-bit periodic irq timing
91OR1 = REGBASE + 0x064 // 32-bit RAM bank #1 options
92CICR = REGBASE + 0x540 // 32(24)-bit CP interrupt config
93CIMR = REGBASE + 0x548 // 32-bit CP interrupt mask
94CISR = REGBASE + 0x54C // 32-bit CP interrupts in-service
95PADIR = REGBASE + 0x550 // 16-bit PortA data direction bitmap
96PAPAR = REGBASE + 0x552 // 16-bit PortA pin assignment bitmap
97PAODR = REGBASE + 0x554 // 16-bit PortA open drain bitmap
98PADAT = REGBASE + 0x556 // 16-bit PortA data register
99
100PCDIR = REGBASE + 0x560 // 16-bit PortC data direction bitmap
101PCPAR = REGBASE + 0x562 // 16-bit PortC pin assignment bitmap
102PCSO = REGBASE + 0x564 // 16-bit PortC special options
103PCDAT = REGBASE + 0x566 // 16-bit PortC data register
104PCINT = REGBASE + 0x568 // 16-bit PortC interrupt control
105CR = REGBASE + 0x5C0 // 16-bit Command register
106
107SCC1_REGS = REGBASE + 0x600
108SCC2_REGS = REGBASE + 0x620
109SCC3_REGS = REGBASE + 0x640
110SCC4_REGS = REGBASE + 0x660
111SICR = REGBASE + 0x6EC // 32-bit SI clock route
112
113// offset from SCCx_REGS
114SCC_GSMR_L = 0x00 // 32 bits
115SCC_GSMR_H = 0x04 // 32 bits
116SCC_PSMR = 0x08 // 16 bits
117SCC_TODR = 0x0C // 16 bits
118SCC_DSR = 0x0E // 16 bits
119SCC_SCCE = 0x10 // 16 bits
120SCC_SCCM = 0x14 // 16 bits
121SCC_SCCS = 0x17 // 8 bits
122
123#if QUICC_MEMCPY_USES_PLX
124 .macro memcpy_from_pci src, dest, len // len must be < 8 MB
125 addl #3, \len
126 andl #0xFFFFFFFC, \len // always copy n * 4 bytes
127 movel \src, PLX_DMA_0_PCI
128 movel \dest, PLX_DMA_0_LOCAL
129 movel \len, PLX_DMA_0_LENGTH
130 movel #0x0103, PLX_DMA_CMD_STS // start channel 0 transfer
131 bsr memcpy_from_pci_run
132 .endm
133
134 .macro memcpy_to_pci src, dest, len
135 addl #3, \len
136 andl #0xFFFFFFFC, \len // always copy n * 4 bytes
137 movel \src, PLX_DMA_1_LOCAL
138 movel \dest, PLX_DMA_1_PCI
139 movel \len, PLX_DMA_1_LENGTH
140 movel #0x0301, PLX_DMA_CMD_STS // start channel 1 transfer
141 bsr memcpy_to_pci_run
142 .endm
143
144#else
145
146 .macro memcpy src, dest, len // len must be < 65536 bytes
147 movel %d7, -(%sp) // src and dest must be < 256 MB
148 movel \len, %d7 // bits 0 and 1
149 lsrl #2, \len
150 andl \len, \len
151 beq 99f // only 0 - 3 bytes
152 subl #1, \len // for dbf
15398: movel (\src)+, (\dest)+
154 dbfw \len, 98b
15599: movel %d7, \len
156 btstl #1, \len
157 beq 99f
158 movew (\src)+, (\dest)+
15999: btstl #0, \len
160 beq 99f
161 moveb (\src)+, (\dest)+
16299:
163 movel (%sp)+, %d7
164 .endm
165
166 .macro memcpy_from_pci src, dest, len
167 addl #VALUE_WINDOW, \src
168 memcpy \src, \dest, \len
169 .endm
170
171 .macro memcpy_to_pci src, dest, len
172 addl #VALUE_WINDOW, \dest
173 memcpy \src, \dest, \len
174 .endm
175#endif
176
177
178 .macro wait_for_command
17999: btstl #0, CR
180 bne 99b
181 .endm
182
183
184
185
186/****************************** card initialization *******************/
187 .text
188 .global _start
189_start: bra init
190
191 .org _start + 4
192ch_status_addr: .long 0, 0, 0, 0
193rx_descs_addr: .long 0
194
195init:
196#if DETECT_RAM
197 movel OR1, %d0
198 andl #0xF00007FF, %d0 // mask AMxx bits
199 orl #0xFFFF800 & ~(MAX_RAM_SIZE - 1), %d0 // update RAM bank size
200 movel %d0, OR1
201#endif
202
203 addl #VALUE_WINDOW, rx_descs_addr // PCI addresses of shared data
204 clrl %d0 // D0 = 4 * port
205init_1: tstl ch_status_addr(%d0)
206 beq init_2
207 addl #VALUE_WINDOW, ch_status_addr(%d0)
208init_2: addl #4, %d0
209 cmpl #4 * 4, %d0
210 bne init_1
211
212 movel #pci9060_interrupt, PCI9060_VECTOR
213 movel #error_interrupt, ERROR_VECTOR
214 movel #port_interrupt_1, SCC1_VECTOR
215 movel #port_interrupt_2, SCC2_VECTOR
216 movel #port_interrupt_3, SCC3_VECTOR
217 movel #port_interrupt_4, SCC4_VECTOR
218 movel #timer_interrupt, TIMER_IRQ * 4
219
220 movel #0x78000000, CIMR // only SCCx IRQs from CPM
221 movew #(TIMER_IRQ_LEVEL << 8) + TIMER_IRQ, PICR // interrupt from PIT
222 movew #PITR_CONST, PITR
223
224 // SCC1=SCCa SCC2=SCCb SCC3=SCCc SCC4=SCCd prio=4 HP=-1 IRQ=64-79
225 movel #0xD41F40 + (CPM_IRQ_LEVEL << 13), CICR
226 movel #0x543, PLX_DMA_0_MODE // 32-bit, Ready, Burst, IRQ
227 movel #0x543, PLX_DMA_1_MODE
228 movel #0x0, PLX_DMA_0_DESC // from PCI to local
229 movel #0x8, PLX_DMA_1_DESC // from local to PCI
230 movel #0x101, PLX_DMA_CMD_STS // enable both DMA channels
231 // enable local IRQ, DMA, doorbells and PCI IRQ
232 orl #0x000F0300, PLX_INTERRUPT_CS
233
234#if DETECT_RAM
235 bsr ram_test
236#else
237 movel #1, PLX_MAILBOX_5 // non-zero value = init complete
238#endif
239 bsr check_csr
240
241 movew #0xFFFF, PAPAR // all pins are clocks/data
242 clrw PADIR // first function
243 clrw PCSO // CD and CTS always active
244
245
246/****************************** main loop *****************************/
247
248main: movel channel_stats, %d7 // D7 = doorbell + irq status
249 clrl channel_stats
250
251 tstl %d7
252 bne main_1
253 // nothing to do - wait for next event
254 stop #0x2200 // supervisor + IRQ level 2
255 movew #0x2700, %sr // disable IRQs again
256 bra main
257
258main_1: clrl %d0 // D0 = 4 * port
259 clrl %d6 // D6 = doorbell to host value
260
261main_l: btstl #DOORBELL_TO_CARD_CLOSE_0, %d7
262 beq main_op
263 bclrl #DOORBELL_TO_CARD_OPEN_0, %d7 // in case both bits are set
264 bsr close_port
265main_op:
266 btstl #DOORBELL_TO_CARD_OPEN_0, %d7
267 beq main_cl
268 bsr open_port
269main_cl:
270 btstl #DOORBELL_TO_CARD_TX_0, %d7
271 beq main_txend
272 bsr tx
273main_txend:
274 btstl #TASK_SCC_0, %d7
275 beq main_next
276 bsr tx_end
277 bsr rx
278
279main_next:
280 lsrl #1, %d7 // port status for next port
281 addl #4, %d0 // D0 = 4 * next port
282 cmpl #4 * 4, %d0
283 bne main_l
284 movel %d6, PLX_DOORBELL_FROM_CARD // signal the host
285 bra main
286
287
288/****************************** open port *****************************/
289
290open_port: // D0 = 4 * port, D6 = doorbell to host
291 movel ch_status_addr(%d0), %a0 // A0 = port status address
292 tstl STATUS_OPEN(%a0)
293 bne open_port_ret // port already open
294 movel #1, STATUS_OPEN(%a0) // confirm the port is open
295// setup BDs
296 clrl tx_in(%d0)
297 clrl tx_out(%d0)
298 clrl tx_count(%d0)
299 clrl rx_in(%d0)
300
301 movel SICR, %d1 // D1 = clock settings in SICR
302 andl clocking_mask(%d0), %d1
303 cmpl #CLOCK_TXFROMRX, STATUS_CLOCKING(%a0)
304 bne open_port_clock_ext
305 orl clocking_txfromrx(%d0), %d1
306 bra open_port_set_clock
307
308open_port_clock_ext:
309 orl clocking_ext(%d0), %d1
310open_port_set_clock:
311 movel %d1, SICR // update clock settings in SICR
312
313 orw #STATUS_CABLE_DTR, csr_output(%d0) // DTR on
314 bsr check_csr // call with disabled timer interrupt
315
316// Setup TX descriptors
317 movel first_buffer(%d0), %d1 // D1 = starting buffer address
318 movel tx_first_bd(%d0), %a1 // A1 = starting TX BD address
319 movel #TX_BUFFERS - 2, %d2 // D2 = TX_BUFFERS - 1 counter
320 movel #0x18000000, %d3 // D3 = initial TX BD flags: Int + Last
321 cmpl #PARITY_NONE, STATUS_PARITY(%a0)
322 beq open_port_tx_loop
323 bsetl #26, %d3 // TX BD flag: Transmit CRC
324open_port_tx_loop:
325 movel %d3, (%a1)+ // TX flags + length
326 movel %d1, (%a1)+ // buffer address
327 addl #BUFFER_LENGTH, %d1
328 dbfw %d2, open_port_tx_loop
329
330 bsetl #29, %d3 // TX BD flag: Wrap (last BD)
331 movel %d3, (%a1)+ // Final TX flags + length
332 movel %d1, (%a1)+ // buffer address
333
334// Setup RX descriptors // A1 = starting RX BD address
335 movel #RX_BUFFERS - 2, %d2 // D2 = RX_BUFFERS - 1 counter
336open_port_rx_loop:
337 movel #0x90000000, (%a1)+ // RX flags + length
338 movel %d1, (%a1)+ // buffer address
339 addl #BUFFER_LENGTH, %d1
340 dbfw %d2, open_port_rx_loop
341
342 movel #0xB0000000, (%a1)+ // Final RX flags + length
343 movel %d1, (%a1)+ // buffer address
344
345// Setup port parameters
346 movel scc_base_addr(%d0), %a1 // A1 = SCC_BASE address
347 movel scc_reg_addr(%d0), %a2 // A2 = SCC_REGS address
348
349 movel #0xFFFF, SCC_SCCE(%a2) // clear status bits
350 movel #0x0000, SCC_SCCM(%a2) // interrupt mask
351
352 movel tx_first_bd(%d0), %d1
353 movew %d1, SCC_TBASE(%a1) // D1 = offset of first TxBD
354 addl #TX_BUFFERS * 8, %d1
355 movew %d1, SCC_RBASE(%a1) // D1 = offset of first RxBD
356 moveb #0x8, SCC_RFCR(%a1) // Intel mode, 1000
357 moveb #0x8, SCC_TFCR(%a1)
358
359// Parity settings
360 cmpl #PARITY_CRC16_PR1_CCITT, STATUS_PARITY(%a0)
361 bne open_port_parity_1
362 clrw SCC_PSMR(%a2) // CRC16-CCITT
363 movel #0xF0B8, SCC_C_MASK(%a1)
364 movel #0xFFFF, SCC_C_PRES(%a1)
365 movew #HDLC_MAX_MRU + 2, SCC_MFLR(%a1) // 2 bytes for CRC
366 movew #2, parity_bytes(%d0)
367 bra open_port_2
368
369open_port_parity_1:
370 cmpl #PARITY_CRC32_PR1_CCITT, STATUS_PARITY(%a0)
371 bne open_port_parity_2
372 movew #0x0800, SCC_PSMR(%a2) // CRC32-CCITT
373 movel #0xDEBB20E3, SCC_C_MASK(%a1)
374 movel #0xFFFFFFFF, SCC_C_PRES(%a1)
375 movew #HDLC_MAX_MRU + 4, SCC_MFLR(%a1) // 4 bytes for CRC
376 movew #4, parity_bytes(%d0)
377 bra open_port_2
378
379open_port_parity_2:
380 cmpl #PARITY_CRC16_PR0_CCITT, STATUS_PARITY(%a0)
381 bne open_port_parity_3
382 clrw SCC_PSMR(%a2) // CRC16-CCITT preset 0
383 movel #0xF0B8, SCC_C_MASK(%a1)
384 clrl SCC_C_PRES(%a1)
385 movew #HDLC_MAX_MRU + 2, SCC_MFLR(%a1) // 2 bytes for CRC
386 movew #2, parity_bytes(%d0)
387 bra open_port_2
388
389open_port_parity_3:
390 cmpl #PARITY_CRC32_PR0_CCITT, STATUS_PARITY(%a0)
391 bne open_port_parity_4
392 movew #0x0800, SCC_PSMR(%a2) // CRC32-CCITT preset 0
393 movel #0xDEBB20E3, SCC_C_MASK(%a1)
394 clrl SCC_C_PRES(%a1)
395 movew #HDLC_MAX_MRU + 4, SCC_MFLR(%a1) // 4 bytes for CRC
396 movew #4, parity_bytes(%d0)
397 bra open_port_2
398
399open_port_parity_4:
400 clrw SCC_PSMR(%a2) // no parity
401 movel #0xF0B8, SCC_C_MASK(%a1)
402 movel #0xFFFF, SCC_C_PRES(%a1)
403 movew #HDLC_MAX_MRU, SCC_MFLR(%a1) // 0 bytes for CRC
404 clrw parity_bytes(%d0)
405
406open_port_2:
407 movel #0x00000003, SCC_GSMR_H(%a2) // RTSM
408 cmpl #ENCODING_NRZI, STATUS_ENCODING(%a0)
409 bne open_port_nrz
410 movel #0x10040900, SCC_GSMR_L(%a2) // NRZI: TCI Tend RECN+TENC=1
411 bra open_port_3
412
413open_port_nrz:
414 movel #0x10040000, SCC_GSMR_L(%a2) // NRZ: TCI Tend RECN+TENC=0
415open_port_3:
416 movew #BUFFER_LENGTH, SCC_MRBLR(%a1)
417 movel %d0, %d1
418 lsll #4, %d1 // D1 bits 7 and 6 = port
419 orl #1, %d1
420 movew %d1, CR // Init SCC RX and TX params
421 wait_for_command
422
423 // TCI Tend ENR ENT
424 movew #0x001F, SCC_SCCM(%a2) // TXE RXF BSY TXB RXB interrupts
425 orl #0x00000030, SCC_GSMR_L(%a2) // enable SCC
426open_port_ret:
427 rts
428
429
430/****************************** close port ****************************/
431
432close_port: // D0 = 4 * port, D6 = doorbell to host
433 movel scc_reg_addr(%d0), %a0 // A0 = SCC_REGS address
434 clrw SCC_SCCM(%a0) // no SCC interrupts
435 andl #0xFFFFFFCF, SCC_GSMR_L(%a0) // Disable ENT and ENR
436
437 andw #~STATUS_CABLE_DTR, csr_output(%d0) // DTR off
438 bsr check_csr // call with disabled timer interrupt
439
440 movel ch_status_addr(%d0), %d1
441 clrl STATUS_OPEN(%d1) // confirm the port is closed
442 rts
443
444
445/****************************** transmit packet ***********************/
446// queue packets for transmission
447tx: // D0 = 4 * port, D6 = doorbell to host
448 cmpl #TX_BUFFERS, tx_count(%d0)
449 beq tx_ret // all DB's = descs in use
450
451 movel tx_out(%d0), %d1
452 movel %d1, %d2 // D1 = D2 = tx_out BD# = desc#
453 mulul #DESC_LENGTH, %d2 // D2 = TX desc offset
454 addl ch_status_addr(%d0), %d2
455 addl #STATUS_TX_DESCS, %d2 // D2 = TX desc address
456 cmpl #PACKET_FULL, (%d2) // desc status
457 bne tx_ret
458
459// queue it
460 movel 4(%d2), %a0 // PCI address
461 lsll #3, %d1 // BD is 8-bytes long
462 addl tx_first_bd(%d0), %d1 // D1 = current tx_out BD addr
463
464 movel 4(%d1), %a1 // A1 = dest address
465 movel 8(%d2), %d2 // D2 = length
466 movew %d2, 2(%d1) // length into BD
467 memcpy_from_pci %a0, %a1, %d2
468 bsetl #31, (%d1) // CP go ahead
469
470// update tx_out and tx_count
471 movel tx_out(%d0), %d1
472 addl #1, %d1
473 cmpl #TX_BUFFERS, %d1
474 bne tx_1
475 clrl %d1
476tx_1: movel %d1, tx_out(%d0)
477
478 addl #1, tx_count(%d0)
479 bra tx
480
481tx_ret: rts
482
483
484/****************************** packet received ***********************/
485
486// Service receive buffers // D0 = 4 * port, D6 = doorbell to host
487rx: movel rx_in(%d0), %d1 // D1 = rx_in BD#
488 lsll #3, %d1 // BD is 8-bytes long
489 addl rx_first_bd(%d0), %d1 // D1 = current rx_in BD address
490 movew (%d1), %d2 // D2 = RX BD flags
491 btstl #15, %d2
492 bne rx_ret // BD still empty
493
494 btstl #1, %d2
495 bne rx_overrun
496
497 tstw parity_bytes(%d0)
498 bne rx_parity
499 bclrl #2, %d2 // do not test for CRC errors
500rx_parity:
501 andw #0x0CBC, %d2 // mask status bits
502 cmpw #0x0C00, %d2 // correct frame
503 bne rx_bad_frame
504 clrl %d3
505 movew 2(%d1), %d3
506 subw parity_bytes(%d0), %d3 // D3 = packet length
507 cmpw #HDLC_MAX_MRU, %d3
508 bgt rx_bad_frame
509
510rx_good_frame:
511 movel rx_out, %d2
512 mulul #DESC_LENGTH, %d2
513 addl rx_descs_addr, %d2 // D2 = RX desc address
514 cmpl #PACKET_EMPTY, (%d2) // desc stat
515 bne rx_overrun
516
517 movel %d3, 8(%d2)
518 movel 4(%d1), %a0 // A0 = source address
519 movel 4(%d2), %a1
520 tstl %a1
521 beq rx_ignore_data
522 memcpy_to_pci %a0, %a1, %d3
523rx_ignore_data:
524 movel packet_full(%d0), (%d2) // update desc stat
525
526// update D6 and rx_out
527 bsetl #DOORBELL_FROM_CARD_RX, %d6 // signal host that RX completed
528 movel rx_out, %d2
529 addl #1, %d2
530 cmpl #RX_QUEUE_LENGTH, %d2
531 bne rx_1
532 clrl %d2
533rx_1: movel %d2, rx_out
534
535rx_free_bd:
536 andw #0xF000, (%d1) // clear CM and error bits
537 bsetl #31, (%d1) // free BD
538// update rx_in
539 movel rx_in(%d0), %d1
540 addl #1, %d1
541 cmpl #RX_BUFFERS, %d1
542 bne rx_2
543 clrl %d1
544rx_2: movel %d1, rx_in(%d0)
545 bra rx
546
547rx_overrun:
548 movel ch_status_addr(%d0), %d2
549 addl #1, STATUS_RX_OVERRUNS(%d2)
550 bra rx_free_bd
551
552rx_bad_frame:
553 movel ch_status_addr(%d0), %d2
554 addl #1, STATUS_RX_FRAME_ERRORS(%d2)
555 bra rx_free_bd
556
557rx_ret: rts
558
559
560/****************************** packet transmitted ********************/
561
562// Service transmit buffers // D0 = 4 * port, D6 = doorbell to host
563tx_end: tstl tx_count(%d0)
564 beq tx_end_ret // TX buffers already empty
565
566 movel tx_in(%d0), %d1
567 movel %d1, %d2 // D1 = D2 = tx_in BD# = desc#
568 lsll #3, %d1 // BD is 8-bytes long
569 addl tx_first_bd(%d0), %d1 // D1 = current tx_in BD address
570 movew (%d1), %d3 // D3 = TX BD flags
571 btstl #15, %d3
572 bne tx_end_ret // BD still being transmitted
573
574// update D6, tx_in and tx_count
575 orl bell_tx(%d0), %d6 // signal host that TX desc freed
576 subl #1, tx_count(%d0)
577 movel tx_in(%d0), %d1
578 addl #1, %d1
579 cmpl #TX_BUFFERS, %d1
580 bne tx_end_1
581 clrl %d1
582tx_end_1:
583 movel %d1, tx_in(%d0)
584
585// free host's descriptor
586 mulul #DESC_LENGTH, %d2 // D2 = TX desc offset
587 addl ch_status_addr(%d0), %d2
588 addl #STATUS_TX_DESCS, %d2 // D2 = TX desc address
589 btstl #1, %d3
590 bne tx_end_underrun
591 movel #PACKET_SENT, (%d2)
592 bra tx_end
593
594tx_end_underrun:
595 movel #PACKET_UNDERRUN, (%d2)
596 bra tx_end
597
598tx_end_ret: rts
599
600
601/****************************** PLX PCI9060 DMA memcpy ****************/
602
603#if QUICC_MEMCPY_USES_PLX
604// called with interrupts disabled
605memcpy_from_pci_run:
606 movel %d0, -(%sp)
607 movew %sr, -(%sp)
608memcpy_1:
609 movel PLX_DMA_CMD_STS, %d0 // do not btst PLX register directly
610 btstl #4, %d0 // transfer done?
611 bne memcpy_end
612 stop #0x2200 // enable PCI9060 interrupts
613 movew #0x2700, %sr // disable interrupts again
614 bra memcpy_1
615
616memcpy_to_pci_run:
617 movel %d0, -(%sp)
618 movew %sr, -(%sp)
619memcpy_2:
620 movel PLX_DMA_CMD_STS, %d0 // do not btst PLX register directly
621 btstl #12, %d0 // transfer done?
622 bne memcpy_end
623 stop #0x2200 // enable PCI9060 interrupts
624 movew #0x2700, %sr // disable interrupts again
625 bra memcpy_2
626
627memcpy_end:
628 movew (%sp)+, %sr
629 movel (%sp)+, %d0
630 rts
631#endif
632
633
634
635
636
637
638/****************************** PLX PCI9060 interrupt *****************/
639
640pci9060_interrupt:
641 movel %d0, -(%sp)
642
643 movel PLX_DOORBELL_TO_CARD, %d0
644 movel %d0, PLX_DOORBELL_TO_CARD // confirm all requests
645 orl %d0, channel_stats
646
647 movel #0x0909, PLX_DMA_CMD_STS // clear DMA ch #0 and #1 interrupts
648
649 movel (%sp)+, %d0
650 rte
651
652/****************************** SCC interrupts ************************/
653
654port_interrupt_1:
655 orl #0, SCC1_REGS + SCC_SCCE; // confirm SCC events
656 orl #1 << TASK_SCC_0, channel_stats
657 movel #0x40000000, CISR
658 rte
659
660port_interrupt_2:
661 orl #0, SCC2_REGS + SCC_SCCE; // confirm SCC events
662 orl #1 << TASK_SCC_1, channel_stats
663 movel #0x20000000, CISR
664 rte
665
666port_interrupt_3:
667 orl #0, SCC3_REGS + SCC_SCCE; // confirm SCC events
668 orl #1 << TASK_SCC_2, channel_stats
669 movel #0x10000000, CISR
670 rte
671
672port_interrupt_4:
673 orl #0, SCC4_REGS + SCC_SCCE; // confirm SCC events
674 orl #1 << TASK_SCC_3, channel_stats
675 movel #0x08000000, CISR
676 rte
677
678error_interrupt:
679 rte
680
681
682/****************************** cable and PM routine ******************/
683// modified registers: none
684check_csr:
685 movel %d0, -(%sp)
686 movel %d1, -(%sp)
687 movel %d2, -(%sp)
688 movel %a0, -(%sp)
689 movel %a1, -(%sp)
690
691 clrl %d0 // D0 = 4 * port
692 movel #CSRA, %a0 // A0 = CSR address
693
694check_csr_loop:
695 movew (%a0), %d1 // D1 = CSR input bits
696 andl #0xE7, %d1 // PM and cable sense bits (no DCE bit)
697 cmpw #STATUS_CABLE_V35 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
698 bne check_csr_1
699 movew #0x0E08, %d1
700 bra check_csr_valid
701
702check_csr_1:
703 cmpw #STATUS_CABLE_X21 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
704 bne check_csr_2
705 movew #0x0408, %d1
706 bra check_csr_valid
707
708check_csr_2:
709 cmpw #STATUS_CABLE_V24 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
710 bne check_csr_3
711 movew #0x0208, %d1
712 bra check_csr_valid
713
714check_csr_3:
715 cmpw #STATUS_CABLE_EIA530 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
716 bne check_csr_disable
717 movew #0x0D08, %d1
718 bra check_csr_valid
719
720check_csr_disable:
721 movew #0x0008, %d1 // D1 = disable everything
722 movew #0x80E7, %d2 // D2 = input mask: ignore DSR
723 bra check_csr_write
724
725check_csr_valid: // D1 = mode and IRQ bits
726 movew csr_output(%d0), %d2
727 andw #0x3000, %d2 // D2 = requested LL and DTR bits
728 orw %d2, %d1 // D1 = all requested output bits
729 movew #0x80FF, %d2 // D2 = input mask: include DSR
730
731check_csr_write:
732 cmpw old_csr_output(%d0), %d1
733 beq check_csr_input
734 movew %d1, old_csr_output(%d0)
735 movew %d1, (%a0) // Write CSR output bits
736
737check_csr_input:
738 movew (PCDAT), %d1
739 andw dcd_mask(%d0), %d1
740 beq check_csr_dcd_on // DCD and CTS signals are negated
741 movew (%a0), %d1 // D1 = CSR input bits
742 andw #~STATUS_CABLE_DCD, %d1 // DCD off
743 bra check_csr_previous
744
745check_csr_dcd_on:
746 movew (%a0), %d1 // D1 = CSR input bits
747 orw #STATUS_CABLE_DCD, %d1 // DCD on
748check_csr_previous:
749 andw %d2, %d1 // input mask
750 movel ch_status_addr(%d0), %a1
751 cmpl STATUS_CABLE(%a1), %d1 // check for change
752 beq check_csr_next
753 movel %d1, STATUS_CABLE(%a1) // update status
754 movel bell_cable(%d0), PLX_DOORBELL_FROM_CARD // signal the host
755
756check_csr_next:
757 addl #2, %a0 // next CSR register
758 addl #4, %d0 // D0 = 4 * next port
759 cmpl #4 * 4, %d0
760 bne check_csr_loop
761
762 movel (%sp)+, %a1
763 movel (%sp)+, %a0
764 movel (%sp)+, %d2
765 movel (%sp)+, %d1
766 movel (%sp)+, %d0
767 rts
768
769
770/****************************** timer interrupt ***********************/
771
772timer_interrupt:
773 bsr check_csr
774 rte
775
776
777/****************************** RAM sizing and test *******************/
778#if DETECT_RAM
779ram_test:
780 movel #0x12345678, %d1 // D1 = test value
781 movel %d1, (128 * 1024 - 4)
782 movel #128 * 1024, %d0 // D0 = RAM size tested
783ram_test_size:
784 cmpl #MAX_RAM_SIZE, %d0
785 beq ram_test_size_found
786 movel %d0, %a0
787 addl #128 * 1024 - 4, %a0
788 cmpl (%a0), %d1
789 beq ram_test_size_check
790ram_test_next_size:
791 lsll #1, %d0
792 bra ram_test_size
793
794ram_test_size_check:
795 eorl #0xFFFFFFFF, %d1
796 movel %d1, (128 * 1024 - 4)
797 cmpl (%a0), %d1
798 bne ram_test_next_size
799
800ram_test_size_found: // D0 = RAM size
801 movel %d0, %a0 // A0 = fill ptr
802 subl #firmware_end + 4, %d0
803 lsrl #2, %d0
804 movel %d0, %d1 // D1 = DBf counter
805ram_test_fill:
806 movel %a0, -(%a0)
807 dbfw %d1, ram_test_fill
808 subl #0x10000, %d1
809 cmpl #0xFFFFFFFF, %d1
810 bne ram_test_fill
811
812ram_test_loop: // D0 = DBf counter
813 cmpl (%a0)+, %a0
814 dbnew %d0, ram_test_loop
815 bne ram_test_found_bad
816 subl #0x10000, %d0
817 cmpl #0xFFFFFFFF, %d0
818 bne ram_test_loop
819 bra ram_test_all_ok
820
821ram_test_found_bad:
822 subl #4, %a0
823ram_test_all_ok:
824 movel %a0, PLX_MAILBOX_5
825 rts
826#endif
827
828
829/****************************** constants *****************************/
830
831scc_reg_addr:
832 .long SCC1_REGS, SCC2_REGS, SCC3_REGS, SCC4_REGS
833scc_base_addr:
834 .long SCC1_BASE, SCC2_BASE, SCC3_BASE, SCC4_BASE
835
836tx_first_bd:
837 .long DPRBASE
838 .long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8
839 .long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8 * 2
840 .long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8 * 3
841
842rx_first_bd:
843 .long DPRBASE + TX_BUFFERS * 8
844 .long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8
845 .long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8 * 2
846 .long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8 * 3
847
848first_buffer:
849 .long BUFFERS_ADDR
850 .long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH
851 .long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH * 2
852 .long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH * 3
853
854bell_tx:
855 .long 1 << DOORBELL_FROM_CARD_TX_0, 1 << DOORBELL_FROM_CARD_TX_1
856 .long 1 << DOORBELL_FROM_CARD_TX_2, 1 << DOORBELL_FROM_CARD_TX_3
857
858bell_cable:
859 .long 1 << DOORBELL_FROM_CARD_CABLE_0, 1 << DOORBELL_FROM_CARD_CABLE_1
860 .long 1 << DOORBELL_FROM_CARD_CABLE_2, 1 << DOORBELL_FROM_CARD_CABLE_3
861
862packet_full:
863 .long PACKET_FULL, PACKET_FULL + 1, PACKET_FULL + 2, PACKET_FULL + 3
864
865clocking_ext:
866 .long 0x0000002C, 0x00003E00, 0x002C0000, 0x3E000000
867clocking_txfromrx:
868 .long 0x0000002D, 0x00003F00, 0x002D0000, 0x3F000000
869clocking_mask:
870 .long 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
871dcd_mask:
872 .word 0x020, 0, 0x080, 0, 0x200, 0, 0x800
873
874 .ascii "wanXL firmware\n"
875 .asciz "Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>\n"
876
877
878/****************************** variables *****************************/
879
880 .align 4
881channel_stats: .long 0
882
883tx_in: .long 0, 0, 0, 0 // transmitted
884tx_out: .long 0, 0, 0, 0 // received from host for transmission
885tx_count: .long 0, 0, 0, 0 // currently in transmit queue
886
887rx_in: .long 0, 0, 0, 0 // received from port
888rx_out: .long 0 // transmitted to host
889parity_bytes: .word 0, 0, 0, 0, 0, 0, 0 // only 4 words are used
890
891csr_output: .word 0
892old_csr_output: .word 0, 0, 0, 0, 0, 0, 0
893 .align 4
894firmware_end: // must be dword-aligned
1.psize 0
2/*
3 wanXL serial card driver for Linux
4 card firmware part
5
6 Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>
7
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of version 2 of the GNU General Public License
10 as published by the Free Software Foundation.
11
12
13
14
15 DPRAM BDs:
16 0x000 - 0x050 TX#0 0x050 - 0x140 RX#0
17 0x140 - 0x190 TX#1 0x190 - 0x280 RX#1
18 0x280 - 0x2D0 TX#2 0x2D0 - 0x3C0 RX#2
19 0x3C0 - 0x410 TX#3 0x410 - 0x500 RX#3
20
21
22 000 5FF 1536 Bytes Dual-Port RAM User Data / BDs
23 600 6FF 256 Bytes Dual-Port RAM User Data / BDs
24 700 7FF 256 Bytes Dual-Port RAM User Data / BDs
25 C00 CBF 192 Bytes Dual-Port RAM Parameter RAM Page 1
26 D00 DBF 192 Bytes Dual-Port RAM Parameter RAM Page 2
27 E00 EBF 192 Bytes Dual-Port RAM Parameter RAM Page 3
28 F00 FBF 192 Bytes Dual-Port RAM Parameter RAM Page 4
29
30 local interrupts level
31 NMI 7
32 PIT timer, CPM (RX/TX complete) 4
33 PCI9060 DMA and PCI doorbells 3
34 Cable - not used 1
35*/
36
37#include <linux/hdlc.h>
38#include "wanxl.h"
39
40/* memory addresses and offsets */
41
42MAX_RAM_SIZE = 16 * 1024 * 1024 // max RAM supported by hardware
43
44PCI9060_VECTOR = 0x0000006C
45CPM_IRQ_BASE = 0x40
46ERROR_VECTOR = CPM_IRQ_BASE * 4
47SCC1_VECTOR = (CPM_IRQ_BASE + 0x1E) * 4
48SCC2_VECTOR = (CPM_IRQ_BASE + 0x1D) * 4
49SCC3_VECTOR = (CPM_IRQ_BASE + 0x1C) * 4
50SCC4_VECTOR = (CPM_IRQ_BASE + 0x1B) * 4
51CPM_IRQ_LEVEL = 4
52TIMER_IRQ = 128
53TIMER_IRQ_LEVEL = 4
54PITR_CONST = 0x100 + 16 // 1 Hz timer
55
56MBAR = 0x0003FF00
57
58VALUE_WINDOW = 0x40000000
59ORDER_WINDOW = 0xC0000000
60
61PLX = 0xFFF90000
62
63CSRA = 0xFFFB0000
64CSRB = 0xFFFB0002
65CSRC = 0xFFFB0004
66CSRD = 0xFFFB0006
67STATUS_CABLE_LL = 0x2000
68STATUS_CABLE_DTR = 0x1000
69
70DPRBASE = 0xFFFC0000
71
72SCC1_BASE = DPRBASE + 0xC00
73MISC_BASE = DPRBASE + 0xCB0
74SCC2_BASE = DPRBASE + 0xD00
75SCC3_BASE = DPRBASE + 0xE00
76SCC4_BASE = DPRBASE + 0xF00
77
78// offset from SCCx_BASE
79// SCC_xBASE contain offsets from DPRBASE and must be divisible by 8
80SCC_RBASE = 0 // 16-bit RxBD base address
81SCC_TBASE = 2 // 16-bit TxBD base address
82SCC_RFCR = 4 // 8-bit Rx function code
83SCC_TFCR = 5 // 8-bit Tx function code
84SCC_MRBLR = 6 // 16-bit maximum Rx buffer length
85SCC_C_MASK = 0x34 // 32-bit CRC constant
86SCC_C_PRES = 0x38 // 32-bit CRC preset
87SCC_MFLR = 0x46 // 16-bit max Rx frame length (without flags)
88
89REGBASE = DPRBASE + 0x1000
90PICR = REGBASE + 0x026 // 16-bit periodic irq control
91PITR = REGBASE + 0x02A // 16-bit periodic irq timing
92OR1 = REGBASE + 0x064 // 32-bit RAM bank #1 options
93CICR = REGBASE + 0x540 // 32(24)-bit CP interrupt config
94CIMR = REGBASE + 0x548 // 32-bit CP interrupt mask
95CISR = REGBASE + 0x54C // 32-bit CP interrupts in-service
96PADIR = REGBASE + 0x550 // 16-bit PortA data direction bitmap
97PAPAR = REGBASE + 0x552 // 16-bit PortA pin assignment bitmap
98PAODR = REGBASE + 0x554 // 16-bit PortA open drain bitmap
99PADAT = REGBASE + 0x556 // 16-bit PortA data register
100
101PCDIR = REGBASE + 0x560 // 16-bit PortC data direction bitmap
102PCPAR = REGBASE + 0x562 // 16-bit PortC pin assignment bitmap
103PCSO = REGBASE + 0x564 // 16-bit PortC special options
104PCDAT = REGBASE + 0x566 // 16-bit PortC data register
105PCINT = REGBASE + 0x568 // 16-bit PortC interrupt control
106CR = REGBASE + 0x5C0 // 16-bit Command register
107
108SCC1_REGS = REGBASE + 0x600
109SCC2_REGS = REGBASE + 0x620
110SCC3_REGS = REGBASE + 0x640
111SCC4_REGS = REGBASE + 0x660
112SICR = REGBASE + 0x6EC // 32-bit SI clock route
113
114// offset from SCCx_REGS
115SCC_GSMR_L = 0x00 // 32 bits
116SCC_GSMR_H = 0x04 // 32 bits
117SCC_PSMR = 0x08 // 16 bits
118SCC_TODR = 0x0C // 16 bits
119SCC_DSR = 0x0E // 16 bits
120SCC_SCCE = 0x10 // 16 bits
121SCC_SCCM = 0x14 // 16 bits
122SCC_SCCS = 0x17 // 8 bits
123
124#if QUICC_MEMCPY_USES_PLX
125 .macro memcpy_from_pci src, dest, len // len must be < 8 MB
126 addl #3, \len
127 andl #0xFFFFFFFC, \len // always copy n * 4 bytes
128 movel \src, PLX_DMA_0_PCI
129 movel \dest, PLX_DMA_0_LOCAL
130 movel \len, PLX_DMA_0_LENGTH
131 movel #0x0103, PLX_DMA_CMD_STS // start channel 0 transfer
132 bsr memcpy_from_pci_run
133 .endm
134
135 .macro memcpy_to_pci src, dest, len
136 addl #3, \len
137 andl #0xFFFFFFFC, \len // always copy n * 4 bytes
138 movel \src, PLX_DMA_1_LOCAL
139 movel \dest, PLX_DMA_1_PCI
140 movel \len, PLX_DMA_1_LENGTH
141 movel #0x0301, PLX_DMA_CMD_STS // start channel 1 transfer
142 bsr memcpy_to_pci_run
143 .endm
144
145#else
146
147 .macro memcpy src, dest, len // len must be < 65536 bytes
148 movel %d7, -(%sp) // src and dest must be < 256 MB
149 movel \len, %d7 // bits 0 and 1
150 lsrl #2, \len
151 andl \len, \len
152 beq 99f // only 0 - 3 bytes
153 subl #1, \len // for dbf
15498: movel (\src)+, (\dest)+
155 dbfw \len, 98b
15699: movel %d7, \len
157 btstl #1, \len
158 beq 99f
159 movew (\src)+, (\dest)+
16099: btstl #0, \len
161 beq 99f
162 moveb (\src)+, (\dest)+
16399:
164 movel (%sp)+, %d7
165 .endm
166
167 .macro memcpy_from_pci src, dest, len
168 addl #VALUE_WINDOW, \src
169 memcpy \src, \dest, \len
170 .endm
171
172 .macro memcpy_to_pci src, dest, len
173 addl #VALUE_WINDOW, \dest
174 memcpy \src, \dest, \len
175 .endm
176#endif
177
178
179 .macro wait_for_command
18099: btstl #0, CR
181 bne 99b
182 .endm
183
184
185
186
187/****************************** card initialization *******************/
188 .text
189 .global _start
190_start: bra init
191
192 .org _start + 4
193ch_status_addr: .long 0, 0, 0, 0
194rx_descs_addr: .long 0
195
196init:
197#if DETECT_RAM
198 movel OR1, %d0
199 andl #0xF00007FF, %d0 // mask AMxx bits
200 orl #0xFFFF800 & ~(MAX_RAM_SIZE - 1), %d0 // update RAM bank size
201 movel %d0, OR1
202#endif
203
204 addl #VALUE_WINDOW, rx_descs_addr // PCI addresses of shared data
205 clrl %d0 // D0 = 4 * port
206init_1: tstl ch_status_addr(%d0)
207 beq init_2
208 addl #VALUE_WINDOW, ch_status_addr(%d0)
209init_2: addl #4, %d0
210 cmpl #4 * 4, %d0
211 bne init_1
212
213 movel #pci9060_interrupt, PCI9060_VECTOR
214 movel #error_interrupt, ERROR_VECTOR
215 movel #port_interrupt_1, SCC1_VECTOR
216 movel #port_interrupt_2, SCC2_VECTOR
217 movel #port_interrupt_3, SCC3_VECTOR
218 movel #port_interrupt_4, SCC4_VECTOR
219 movel #timer_interrupt, TIMER_IRQ * 4
220
221 movel #0x78000000, CIMR // only SCCx IRQs from CPM
222 movew #(TIMER_IRQ_LEVEL << 8) + TIMER_IRQ, PICR // interrupt from PIT
223 movew #PITR_CONST, PITR
224
225 // SCC1=SCCa SCC2=SCCb SCC3=SCCc SCC4=SCCd prio=4 HP=-1 IRQ=64-79
226 movel #0xD41F40 + (CPM_IRQ_LEVEL << 13), CICR
227 movel #0x543, PLX_DMA_0_MODE // 32-bit, Ready, Burst, IRQ
228 movel #0x543, PLX_DMA_1_MODE
229 movel #0x0, PLX_DMA_0_DESC // from PCI to local
230 movel #0x8, PLX_DMA_1_DESC // from local to PCI
231 movel #0x101, PLX_DMA_CMD_STS // enable both DMA channels
232 // enable local IRQ, DMA, doorbells and PCI IRQ
233 orl #0x000F0300, PLX_INTERRUPT_CS
234
235#if DETECT_RAM
236 bsr ram_test
237#else
238 movel #1, PLX_MAILBOX_5 // non-zero value = init complete
239#endif
240 bsr check_csr
241
242 movew #0xFFFF, PAPAR // all pins are clocks/data
243 clrw PADIR // first function
244 clrw PCSO // CD and CTS always active
245
246
247/****************************** main loop *****************************/
248
249main: movel channel_stats, %d7 // D7 = doorbell + irq status
250 clrl channel_stats
251
252 tstl %d7
253 bne main_1
254 // nothing to do - wait for next event
255 stop #0x2200 // supervisor + IRQ level 2
256 movew #0x2700, %sr // disable IRQs again
257 bra main
258
259main_1: clrl %d0 // D0 = 4 * port
260 clrl %d6 // D6 = doorbell to host value
261
262main_l: btstl #DOORBELL_TO_CARD_CLOSE_0, %d7
263 beq main_op
264 bclrl #DOORBELL_TO_CARD_OPEN_0, %d7 // in case both bits are set
265 bsr close_port
266main_op:
267 btstl #DOORBELL_TO_CARD_OPEN_0, %d7
268 beq main_cl
269 bsr open_port
270main_cl:
271 btstl #DOORBELL_TO_CARD_TX_0, %d7
272 beq main_txend
273 bsr tx
274main_txend:
275 btstl #TASK_SCC_0, %d7
276 beq main_next
277 bsr tx_end
278 bsr rx
279
280main_next:
281 lsrl #1, %d7 // port status for next port
282 addl #4, %d0 // D0 = 4 * next port
283 cmpl #4 * 4, %d0
284 bne main_l
285 movel %d6, PLX_DOORBELL_FROM_CARD // signal the host
286 bra main
287
288
289/****************************** open port *****************************/
290
291open_port: // D0 = 4 * port, D6 = doorbell to host
292 movel ch_status_addr(%d0), %a0 // A0 = port status address
293 tstl STATUS_OPEN(%a0)
294 bne open_port_ret // port already open
295 movel #1, STATUS_OPEN(%a0) // confirm the port is open
296// setup BDs
297 clrl tx_in(%d0)
298 clrl tx_out(%d0)
299 clrl tx_count(%d0)
300 clrl rx_in(%d0)
301
302 movel SICR, %d1 // D1 = clock settings in SICR
303 andl clocking_mask(%d0), %d1
304 cmpl #CLOCK_TXFROMRX, STATUS_CLOCKING(%a0)
305 bne open_port_clock_ext
306 orl clocking_txfromrx(%d0), %d1
307 bra open_port_set_clock
308
309open_port_clock_ext:
310 orl clocking_ext(%d0), %d1
311open_port_set_clock:
312 movel %d1, SICR // update clock settings in SICR
313
314 orw #STATUS_CABLE_DTR, csr_output(%d0) // DTR on
315 bsr check_csr // call with disabled timer interrupt
316
317// Setup TX descriptors
318 movel first_buffer(%d0), %d1 // D1 = starting buffer address
319 movel tx_first_bd(%d0), %a1 // A1 = starting TX BD address
320 movel #TX_BUFFERS - 2, %d2 // D2 = TX_BUFFERS - 1 counter
321 movel #0x18000000, %d3 // D3 = initial TX BD flags: Int + Last
322 cmpl #PARITY_NONE, STATUS_PARITY(%a0)
323 beq open_port_tx_loop
324 bsetl #26, %d3 // TX BD flag: Transmit CRC
325open_port_tx_loop:
326 movel %d3, (%a1)+ // TX flags + length
327 movel %d1, (%a1)+ // buffer address
328 addl #BUFFER_LENGTH, %d1
329 dbfw %d2, open_port_tx_loop
330
331 bsetl #29, %d3 // TX BD flag: Wrap (last BD)
332 movel %d3, (%a1)+ // Final TX flags + length
333 movel %d1, (%a1)+ // buffer address
334
335// Setup RX descriptors // A1 = starting RX BD address
336 movel #RX_BUFFERS - 2, %d2 // D2 = RX_BUFFERS - 1 counter
337open_port_rx_loop:
338 movel #0x90000000, (%a1)+ // RX flags + length
339 movel %d1, (%a1)+ // buffer address
340 addl #BUFFER_LENGTH, %d1
341 dbfw %d2, open_port_rx_loop
342
343 movel #0xB0000000, (%a1)+ // Final RX flags + length
344 movel %d1, (%a1)+ // buffer address
345
346// Setup port parameters
347 movel scc_base_addr(%d0), %a1 // A1 = SCC_BASE address
348 movel scc_reg_addr(%d0), %a2 // A2 = SCC_REGS address
349
350 movel #0xFFFF, SCC_SCCE(%a2) // clear status bits
351 movel #0x0000, SCC_SCCM(%a2) // interrupt mask
352
353 movel tx_first_bd(%d0), %d1
354 movew %d1, SCC_TBASE(%a1) // D1 = offset of first TxBD
355 addl #TX_BUFFERS * 8, %d1
356 movew %d1, SCC_RBASE(%a1) // D1 = offset of first RxBD
357 moveb #0x8, SCC_RFCR(%a1) // Intel mode, 1000
358 moveb #0x8, SCC_TFCR(%a1)
359
360// Parity settings
361 cmpl #PARITY_CRC16_PR1_CCITT, STATUS_PARITY(%a0)
362 bne open_port_parity_1
363 clrw SCC_PSMR(%a2) // CRC16-CCITT
364 movel #0xF0B8, SCC_C_MASK(%a1)
365 movel #0xFFFF, SCC_C_PRES(%a1)
366 movew #HDLC_MAX_MRU + 2, SCC_MFLR(%a1) // 2 bytes for CRC
367 movew #2, parity_bytes(%d0)
368 bra open_port_2
369
370open_port_parity_1:
371 cmpl #PARITY_CRC32_PR1_CCITT, STATUS_PARITY(%a0)
372 bne open_port_parity_2
373 movew #0x0800, SCC_PSMR(%a2) // CRC32-CCITT
374 movel #0xDEBB20E3, SCC_C_MASK(%a1)
375 movel #0xFFFFFFFF, SCC_C_PRES(%a1)
376 movew #HDLC_MAX_MRU + 4, SCC_MFLR(%a1) // 4 bytes for CRC
377 movew #4, parity_bytes(%d0)
378 bra open_port_2
379
380open_port_parity_2:
381 cmpl #PARITY_CRC16_PR0_CCITT, STATUS_PARITY(%a0)
382 bne open_port_parity_3
383 clrw SCC_PSMR(%a2) // CRC16-CCITT preset 0
384 movel #0xF0B8, SCC_C_MASK(%a1)
385 clrl SCC_C_PRES(%a1)
386 movew #HDLC_MAX_MRU + 2, SCC_MFLR(%a1) // 2 bytes for CRC
387 movew #2, parity_bytes(%d0)
388 bra open_port_2
389
390open_port_parity_3:
391 cmpl #PARITY_CRC32_PR0_CCITT, STATUS_PARITY(%a0)
392 bne open_port_parity_4
393 movew #0x0800, SCC_PSMR(%a2) // CRC32-CCITT preset 0
394 movel #0xDEBB20E3, SCC_C_MASK(%a1)
395 clrl SCC_C_PRES(%a1)
396 movew #HDLC_MAX_MRU + 4, SCC_MFLR(%a1) // 4 bytes for CRC
397 movew #4, parity_bytes(%d0)
398 bra open_port_2
399
400open_port_parity_4:
401 clrw SCC_PSMR(%a2) // no parity
402 movel #0xF0B8, SCC_C_MASK(%a1)
403 movel #0xFFFF, SCC_C_PRES(%a1)
404 movew #HDLC_MAX_MRU, SCC_MFLR(%a1) // 0 bytes for CRC
405 clrw parity_bytes(%d0)
406
407open_port_2:
408 movel #0x00000003, SCC_GSMR_H(%a2) // RTSM
409 cmpl #ENCODING_NRZI, STATUS_ENCODING(%a0)
410 bne open_port_nrz
411 movel #0x10040900, SCC_GSMR_L(%a2) // NRZI: TCI Tend RECN+TENC=1
412 bra open_port_3
413
414open_port_nrz:
415 movel #0x10040000, SCC_GSMR_L(%a2) // NRZ: TCI Tend RECN+TENC=0
416open_port_3:
417 movew #BUFFER_LENGTH, SCC_MRBLR(%a1)
418 movel %d0, %d1
419 lsll #4, %d1 // D1 bits 7 and 6 = port
420 orl #1, %d1
421 movew %d1, CR // Init SCC RX and TX params
422 wait_for_command
423
424 // TCI Tend ENR ENT
425 movew #0x001F, SCC_SCCM(%a2) // TXE RXF BSY TXB RXB interrupts
426 orl #0x00000030, SCC_GSMR_L(%a2) // enable SCC
427open_port_ret:
428 rts
429
430
431/****************************** close port ****************************/
432
433close_port: // D0 = 4 * port, D6 = doorbell to host
434 movel scc_reg_addr(%d0), %a0 // A0 = SCC_REGS address
435 clrw SCC_SCCM(%a0) // no SCC interrupts
436 andl #0xFFFFFFCF, SCC_GSMR_L(%a0) // Disable ENT and ENR
437
438 andw #~STATUS_CABLE_DTR, csr_output(%d0) // DTR off
439 bsr check_csr // call with disabled timer interrupt
440
441 movel ch_status_addr(%d0), %d1
442 clrl STATUS_OPEN(%d1) // confirm the port is closed
443 rts
444
445
446/****************************** transmit packet ***********************/
447// queue packets for transmission
448tx: // D0 = 4 * port, D6 = doorbell to host
449 cmpl #TX_BUFFERS, tx_count(%d0)
450 beq tx_ret // all DB's = descs in use
451
452 movel tx_out(%d0), %d1
453 movel %d1, %d2 // D1 = D2 = tx_out BD# = desc#
454 mulul #DESC_LENGTH, %d2 // D2 = TX desc offset
455 addl ch_status_addr(%d0), %d2
456 addl #STATUS_TX_DESCS, %d2 // D2 = TX desc address
457 cmpl #PACKET_FULL, (%d2) // desc status
458 bne tx_ret
459
460// queue it
461 movel 4(%d2), %a0 // PCI address
462 lsll #3, %d1 // BD is 8-bytes long
463 addl tx_first_bd(%d0), %d1 // D1 = current tx_out BD addr
464
465 movel 4(%d1), %a1 // A1 = dest address
466 movel 8(%d2), %d2 // D2 = length
467 movew %d2, 2(%d1) // length into BD
468 memcpy_from_pci %a0, %a1, %d2
469 bsetl #31, (%d1) // CP go ahead
470
471// update tx_out and tx_count
472 movel tx_out(%d0), %d1
473 addl #1, %d1
474 cmpl #TX_BUFFERS, %d1
475 bne tx_1
476 clrl %d1
477tx_1: movel %d1, tx_out(%d0)
478
479 addl #1, tx_count(%d0)
480 bra tx
481
482tx_ret: rts
483
484
485/****************************** packet received ***********************/
486
487// Service receive buffers // D0 = 4 * port, D6 = doorbell to host
488rx: movel rx_in(%d0), %d1 // D1 = rx_in BD#
489 lsll #3, %d1 // BD is 8-bytes long
490 addl rx_first_bd(%d0), %d1 // D1 = current rx_in BD address
491 movew (%d1), %d2 // D2 = RX BD flags
492 btstl #15, %d2
493 bne rx_ret // BD still empty
494
495 btstl #1, %d2
496 bne rx_overrun
497
498 tstw parity_bytes(%d0)
499 bne rx_parity
500 bclrl #2, %d2 // do not test for CRC errors
501rx_parity:
502 andw #0x0CBC, %d2 // mask status bits
503 cmpw #0x0C00, %d2 // correct frame
504 bne rx_bad_frame
505 clrl %d3
506 movew 2(%d1), %d3
507 subw parity_bytes(%d0), %d3 // D3 = packet length
508 cmpw #HDLC_MAX_MRU, %d3
509 bgt rx_bad_frame
510
511rx_good_frame:
512 movel rx_out, %d2
513 mulul #DESC_LENGTH, %d2
514 addl rx_descs_addr, %d2 // D2 = RX desc address
515 cmpl #PACKET_EMPTY, (%d2) // desc stat
516 bne rx_overrun
517
518 movel %d3, 8(%d2)
519 movel 4(%d1), %a0 // A0 = source address
520 movel 4(%d2), %a1
521 tstl %a1
522 beq rx_ignore_data
523 memcpy_to_pci %a0, %a1, %d3
524rx_ignore_data:
525 movel packet_full(%d0), (%d2) // update desc stat
526
527// update D6 and rx_out
528 bsetl #DOORBELL_FROM_CARD_RX, %d6 // signal host that RX completed
529 movel rx_out, %d2
530 addl #1, %d2
531 cmpl #RX_QUEUE_LENGTH, %d2
532 bne rx_1
533 clrl %d2
534rx_1: movel %d2, rx_out
535
536rx_free_bd:
537 andw #0xF000, (%d1) // clear CM and error bits
538 bsetl #31, (%d1) // free BD
539// update rx_in
540 movel rx_in(%d0), %d1
541 addl #1, %d1
542 cmpl #RX_BUFFERS, %d1
543 bne rx_2
544 clrl %d1
545rx_2: movel %d1, rx_in(%d0)
546 bra rx
547
548rx_overrun:
549 movel ch_status_addr(%d0), %d2
550 addl #1, STATUS_RX_OVERRUNS(%d2)
551 bra rx_free_bd
552
553rx_bad_frame:
554 movel ch_status_addr(%d0), %d2
555 addl #1, STATUS_RX_FRAME_ERRORS(%d2)
556 bra rx_free_bd
557
558rx_ret: rts
559
560
561/****************************** packet transmitted ********************/
562
563// Service transmit buffers // D0 = 4 * port, D6 = doorbell to host
564tx_end: tstl tx_count(%d0)
565 beq tx_end_ret // TX buffers already empty
566
567 movel tx_in(%d0), %d1
568 movel %d1, %d2 // D1 = D2 = tx_in BD# = desc#
569 lsll #3, %d1 // BD is 8-bytes long
570 addl tx_first_bd(%d0), %d1 // D1 = current tx_in BD address
571 movew (%d1), %d3 // D3 = TX BD flags
572 btstl #15, %d3
573 bne tx_end_ret // BD still being transmitted
574
575// update D6, tx_in and tx_count
576 orl bell_tx(%d0), %d6 // signal host that TX desc freed
577 subl #1, tx_count(%d0)
578 movel tx_in(%d0), %d1
579 addl #1, %d1
580 cmpl #TX_BUFFERS, %d1
581 bne tx_end_1
582 clrl %d1
583tx_end_1:
584 movel %d1, tx_in(%d0)
585
586// free host's descriptor
587 mulul #DESC_LENGTH, %d2 // D2 = TX desc offset
588 addl ch_status_addr(%d0), %d2
589 addl #STATUS_TX_DESCS, %d2 // D2 = TX desc address
590 btstl #1, %d3
591 bne tx_end_underrun
592 movel #PACKET_SENT, (%d2)
593 bra tx_end
594
595tx_end_underrun:
596 movel #PACKET_UNDERRUN, (%d2)
597 bra tx_end
598
599tx_end_ret: rts
600
601
602/****************************** PLX PCI9060 DMA memcpy ****************/
603
604#if QUICC_MEMCPY_USES_PLX
605// called with interrupts disabled
606memcpy_from_pci_run:
607 movel %d0, -(%sp)
608 movew %sr, -(%sp)
609memcpy_1:
610 movel PLX_DMA_CMD_STS, %d0 // do not btst PLX register directly
611 btstl #4, %d0 // transfer done?
612 bne memcpy_end
613 stop #0x2200 // enable PCI9060 interrupts
614 movew #0x2700, %sr // disable interrupts again
615 bra memcpy_1
616
617memcpy_to_pci_run:
618 movel %d0, -(%sp)
619 movew %sr, -(%sp)
620memcpy_2:
621 movel PLX_DMA_CMD_STS, %d0 // do not btst PLX register directly
622 btstl #12, %d0 // transfer done?
623 bne memcpy_end
624 stop #0x2200 // enable PCI9060 interrupts
625 movew #0x2700, %sr // disable interrupts again
626 bra memcpy_2
627
628memcpy_end:
629 movew (%sp)+, %sr
630 movel (%sp)+, %d0
631 rts
632#endif
633
634
635
636
637
638
639/****************************** PLX PCI9060 interrupt *****************/
640
641pci9060_interrupt:
642 movel %d0, -(%sp)
643
644 movel PLX_DOORBELL_TO_CARD, %d0
645 movel %d0, PLX_DOORBELL_TO_CARD // confirm all requests
646 orl %d0, channel_stats
647
648 movel #0x0909, PLX_DMA_CMD_STS // clear DMA ch #0 and #1 interrupts
649
650 movel (%sp)+, %d0
651 rte
652
653/****************************** SCC interrupts ************************/
654
655port_interrupt_1:
656 orl #0, SCC1_REGS + SCC_SCCE; // confirm SCC events
657 orl #1 << TASK_SCC_0, channel_stats
658 movel #0x40000000, CISR
659 rte
660
661port_interrupt_2:
662 orl #0, SCC2_REGS + SCC_SCCE; // confirm SCC events
663 orl #1 << TASK_SCC_1, channel_stats
664 movel #0x20000000, CISR
665 rte
666
667port_interrupt_3:
668 orl #0, SCC3_REGS + SCC_SCCE; // confirm SCC events
669 orl #1 << TASK_SCC_2, channel_stats
670 movel #0x10000000, CISR
671 rte
672
673port_interrupt_4:
674 orl #0, SCC4_REGS + SCC_SCCE; // confirm SCC events
675 orl #1 << TASK_SCC_3, channel_stats
676 movel #0x08000000, CISR
677 rte
678
679error_interrupt:
680 rte
681
682
683/****************************** cable and PM routine ******************/
684// modified registers: none
685check_csr:
686 movel %d0, -(%sp)
687 movel %d1, -(%sp)
688 movel %d2, -(%sp)
689 movel %a0, -(%sp)
690 movel %a1, -(%sp)
691
692 clrl %d0 // D0 = 4 * port
693 movel #CSRA, %a0 // A0 = CSR address
694
695check_csr_loop:
696 movew (%a0), %d1 // D1 = CSR input bits
697 andl #0xE7, %d1 // PM and cable sense bits (no DCE bit)
698 cmpw #STATUS_CABLE_V35 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
699 bne check_csr_1
700 movew #0x0E08, %d1
701 bra check_csr_valid
702
703check_csr_1:
704 cmpw #STATUS_CABLE_X21 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
705 bne check_csr_2
706 movew #0x0408, %d1
707 bra check_csr_valid
708
709check_csr_2:
710 cmpw #STATUS_CABLE_V24 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
711 bne check_csr_3
712 movew #0x0208, %d1
713 bra check_csr_valid
714
715check_csr_3:
716 cmpw #STATUS_CABLE_EIA530 * (1 + 1 << STATUS_CABLE_PM_SHIFT), %d1
717 bne check_csr_disable
718 movew #0x0D08, %d1
719 bra check_csr_valid
720
721check_csr_disable:
722 movew #0x0008, %d1 // D1 = disable everything
723 movew #0x80E7, %d2 // D2 = input mask: ignore DSR
724 bra check_csr_write
725
726check_csr_valid: // D1 = mode and IRQ bits
727 movew csr_output(%d0), %d2
728 andw #0x3000, %d2 // D2 = requested LL and DTR bits
729 orw %d2, %d1 // D1 = all requested output bits
730 movew #0x80FF, %d2 // D2 = input mask: include DSR
731
732check_csr_write:
733 cmpw old_csr_output(%d0), %d1
734 beq check_csr_input
735 movew %d1, old_csr_output(%d0)
736 movew %d1, (%a0) // Write CSR output bits
737
738check_csr_input:
739 movew (PCDAT), %d1
740 andw dcd_mask(%d0), %d1
741 beq check_csr_dcd_on // DCD and CTS signals are negated
742 movew (%a0), %d1 // D1 = CSR input bits
743 andw #~STATUS_CABLE_DCD, %d1 // DCD off
744 bra check_csr_previous
745
746check_csr_dcd_on:
747 movew (%a0), %d1 // D1 = CSR input bits
748 orw #STATUS_CABLE_DCD, %d1 // DCD on
749check_csr_previous:
750 andw %d2, %d1 // input mask
751 movel ch_status_addr(%d0), %a1
752 cmpl STATUS_CABLE(%a1), %d1 // check for change
753 beq check_csr_next
754 movel %d1, STATUS_CABLE(%a1) // update status
755 movel bell_cable(%d0), PLX_DOORBELL_FROM_CARD // signal the host
756
757check_csr_next:
758 addl #2, %a0 // next CSR register
759 addl #4, %d0 // D0 = 4 * next port
760 cmpl #4 * 4, %d0
761 bne check_csr_loop
762
763 movel (%sp)+, %a1
764 movel (%sp)+, %a0
765 movel (%sp)+, %d2
766 movel (%sp)+, %d1
767 movel (%sp)+, %d0
768 rts
769
770
771/****************************** timer interrupt ***********************/
772
773timer_interrupt:
774 bsr check_csr
775 rte
776
777
778/****************************** RAM sizing and test *******************/
779#if DETECT_RAM
780ram_test:
781 movel #0x12345678, %d1 // D1 = test value
782 movel %d1, (128 * 1024 - 4)
783 movel #128 * 1024, %d0 // D0 = RAM size tested
784ram_test_size:
785 cmpl #MAX_RAM_SIZE, %d0
786 beq ram_test_size_found
787 movel %d0, %a0
788 addl #128 * 1024 - 4, %a0
789 cmpl (%a0), %d1
790 beq ram_test_size_check
791ram_test_next_size:
792 lsll #1, %d0
793 bra ram_test_size
794
795ram_test_size_check:
796 eorl #0xFFFFFFFF, %d1
797 movel %d1, (128 * 1024 - 4)
798 cmpl (%a0), %d1
799 bne ram_test_next_size
800
801ram_test_size_found: // D0 = RAM size
802 movel %d0, %a0 // A0 = fill ptr
803 subl #firmware_end + 4, %d0
804 lsrl #2, %d0
805 movel %d0, %d1 // D1 = DBf counter
806ram_test_fill:
807 movel %a0, -(%a0)
808 dbfw %d1, ram_test_fill
809 subl #0x10000, %d1
810 cmpl #0xFFFFFFFF, %d1
811 bne ram_test_fill
812
813ram_test_loop: // D0 = DBf counter
814 cmpl (%a0)+, %a0
815 dbnew %d0, ram_test_loop
816 bne ram_test_found_bad
817 subl #0x10000, %d0
818 cmpl #0xFFFFFFFF, %d0
819 bne ram_test_loop
820 bra ram_test_all_ok
821
822ram_test_found_bad:
823 subl #4, %a0
824ram_test_all_ok:
825 movel %a0, PLX_MAILBOX_5
826 rts
827#endif
828
829
830/****************************** constants *****************************/
831
832scc_reg_addr:
833 .long SCC1_REGS, SCC2_REGS, SCC3_REGS, SCC4_REGS
834scc_base_addr:
835 .long SCC1_BASE, SCC2_BASE, SCC3_BASE, SCC4_BASE
836
837tx_first_bd:
838 .long DPRBASE
839 .long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8
840 .long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8 * 2
841 .long DPRBASE + (TX_BUFFERS + RX_BUFFERS) * 8 * 3
842
843rx_first_bd:
844 .long DPRBASE + TX_BUFFERS * 8
845 .long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8
846 .long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8 * 2
847 .long DPRBASE + TX_BUFFERS * 8 + (TX_BUFFERS + RX_BUFFERS) * 8 * 3
848
849first_buffer:
850 .long BUFFERS_ADDR
851 .long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH
852 .long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH * 2
853 .long BUFFERS_ADDR + (TX_BUFFERS + RX_BUFFERS) * BUFFER_LENGTH * 3
854
855bell_tx:
856 .long 1 << DOORBELL_FROM_CARD_TX_0, 1 << DOORBELL_FROM_CARD_TX_1
857 .long 1 << DOORBELL_FROM_CARD_TX_2, 1 << DOORBELL_FROM_CARD_TX_3
858
859bell_cable:
860 .long 1 << DOORBELL_FROM_CARD_CABLE_0, 1 << DOORBELL_FROM_CARD_CABLE_1
861 .long 1 << DOORBELL_FROM_CARD_CABLE_2, 1 << DOORBELL_FROM_CARD_CABLE_3
862
863packet_full:
864 .long PACKET_FULL, PACKET_FULL + 1, PACKET_FULL + 2, PACKET_FULL + 3
865
866clocking_ext:
867 .long 0x0000002C, 0x00003E00, 0x002C0000, 0x3E000000
868clocking_txfromrx:
869 .long 0x0000002D, 0x00003F00, 0x002D0000, 0x3F000000
870clocking_mask:
871 .long 0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000
872dcd_mask:
873 .word 0x020, 0, 0x080, 0, 0x200, 0, 0x800
874
875 .ascii "wanXL firmware\n"
876 .asciz "Copyright (C) 2003 Krzysztof Halasa <khc@pm.waw.pl>\n"
877
878
879/****************************** variables *****************************/
880
881 .align 4
882channel_stats: .long 0
883
884tx_in: .long 0, 0, 0, 0 // transmitted
885tx_out: .long 0, 0, 0, 0 // received from host for transmission
886tx_count: .long 0, 0, 0, 0 // currently in transmit queue
887
888rx_in: .long 0, 0, 0, 0 // received from port
889rx_out: .long 0 // transmitted to host
890parity_bytes: .word 0, 0, 0, 0, 0, 0, 0 // only 4 words are used
891
892csr_output: .word 0
893old_csr_output: .word 0, 0, 0, 0, 0, 0, 0
894 .align 4
895firmware_end: // must be dword-aligned