1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * arch/m68k/mvme16x/config.c
4 *
5 * Copyright (C) 1995 Richard Hirst [richard@sleepie.demon.co.uk]
6 *
7 * Based on:
8 *
9 * linux/amiga/config.c
10 *
11 * Copyright (C) 1993 Hamish Macdonald
12 */
13
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/seq_file.h>
18 #include <linux/tty.h>
19 #include <linux/clocksource.h>
20 #include <linux/console.h>
21 #include <linux/linkage.h>
22 #include <linux/init.h>
23 #include <linux/major.h>
24 #include <linux/rtc.h>
25 #include <linux/interrupt.h>
26 #include <linux/module.h>
27
28 #include <asm/bootinfo.h>
29 #include <asm/bootinfo-vme.h>
30 #include <asm/byteorder.h>
31 #include <asm/setup.h>
32 #include <asm/irq.h>
33 #include <asm/traps.h>
34 #include <asm/machdep.h>
35 #include <asm/mvme16xhw.h>
36 #include <asm/config.h>
37
38 #include "mvme16x.h"
39
40 extern t_bdid mvme_bdid;
41
42 static MK48T08ptr_t volatile rtc = (MK48T08ptr_t)MVME_RTC_BASE;
43
44 static void mvme16x_get_model(char *model);
45 extern void mvme16x_sched_init(void);
46 extern int mvme16x_hwclk (int, struct rtc_time *);
47 extern void mvme16x_reset (void);
48
49 int bcd2int (unsigned char b);
50
51
52 unsigned short mvme16x_config;
53 EXPORT_SYMBOL(mvme16x_config);
54
55
mvme16x_parse_bootinfo(const struct bi_record * bi)56 int __init mvme16x_parse_bootinfo(const struct bi_record *bi)
57 {
58 uint16_t tag = be16_to_cpu(bi->tag);
59 if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
60 return 0;
61 else
62 return 1;
63 }
64
mvme16x_reset(void)65 void mvme16x_reset(void)
66 {
67 pr_info("\r\n\nCalled mvme16x_reset\r\n"
68 "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
69 /* The string of returns is to delay the reset until the whole
70 * message is output. Assert reset bit in GCSR */
71 *(volatile char *)0xfff40107 = 0x80;
72 }
73
mvme16x_get_model(char * model)74 static void mvme16x_get_model(char *model)
75 {
76 p_bdid p = &mvme_bdid;
77 char suf[4];
78
79 suf[1] = p->brdsuffix[0];
80 suf[2] = p->brdsuffix[1];
81 suf[3] = '\0';
82 suf[0] = suf[1] ? '-' : '\0';
83
84 sprintf(model, "Motorola MVME%x%s", be16_to_cpu(p->brdno), suf);
85 }
86
87
mvme16x_get_hardware_list(struct seq_file * m)88 static void mvme16x_get_hardware_list(struct seq_file *m)
89 {
90 uint16_t brdno = be16_to_cpu(mvme_bdid.brdno);
91
92 if (brdno == 0x0162 || brdno == 0x0172)
93 {
94 unsigned char rev = *(unsigned char *)MVME162_VERSION_REG;
95
96 seq_printf (m, "VMEchip2 %spresent\n",
97 rev & MVME16x_CONFIG_NO_VMECHIP2 ? "NOT " : "");
98 seq_printf (m, "SCSI interface %spresent\n",
99 rev & MVME16x_CONFIG_NO_SCSICHIP ? "NOT " : "");
100 seq_printf (m, "Ethernet i/f %spresent\n",
101 rev & MVME16x_CONFIG_NO_ETHERNET ? "NOT " : "");
102 }
103 }
104
105 /*
106 * This function is called during kernel startup to initialize
107 * the mvme16x IRQ handling routines. Should probably ensure
108 * that the base vectors for the VMEChip2 and PCCChip2 are valid.
109 */
110
mvme16x_init_IRQ(void)111 static void __init mvme16x_init_IRQ (void)
112 {
113 m68k_setup_user_interrupt(VEC_USER, 192);
114 }
115
116 #define PCC2CHIP (0xfff42000)
117 #define PCCSCCMICR (PCC2CHIP + 0x1d)
118 #define PCCSCCTICR (PCC2CHIP + 0x1e)
119 #define PCCSCCRICR (PCC2CHIP + 0x1f)
120 #define PCCTPIACKR (PCC2CHIP + 0x25)
121
122 #ifdef CONFIG_EARLY_PRINTK
123
124 /**** cd2401 registers ****/
125 #define CD2401_ADDR (0xfff45000)
126
127 #define CyGFRCR (0x81)
128 #define CyCCR (0x13)
129 #define CyCLR_CHAN (0x40)
130 #define CyINIT_CHAN (0x20)
131 #define CyCHIP_RESET (0x10)
132 #define CyENB_XMTR (0x08)
133 #define CyDIS_XMTR (0x04)
134 #define CyENB_RCVR (0x02)
135 #define CyDIS_RCVR (0x01)
136 #define CyCAR (0xee)
137 #define CyIER (0x11)
138 #define CyMdmCh (0x80)
139 #define CyRxExc (0x20)
140 #define CyRxData (0x08)
141 #define CyTxMpty (0x02)
142 #define CyTxRdy (0x01)
143 #define CyLICR (0x26)
144 #define CyRISR (0x89)
145 #define CyTIMEOUT (0x80)
146 #define CySPECHAR (0x70)
147 #define CyOVERRUN (0x08)
148 #define CyPARITY (0x04)
149 #define CyFRAME (0x02)
150 #define CyBREAK (0x01)
151 #define CyREOIR (0x84)
152 #define CyTEOIR (0x85)
153 #define CyMEOIR (0x86)
154 #define CyNOTRANS (0x08)
155 #define CyRFOC (0x30)
156 #define CyRDR (0xf8)
157 #define CyTDR (0xf8)
158 #define CyMISR (0x8b)
159 #define CyRISR (0x89)
160 #define CyTISR (0x8a)
161 #define CyMSVR1 (0xde)
162 #define CyMSVR2 (0xdf)
163 #define CyDSR (0x80)
164 #define CyDCD (0x40)
165 #define CyCTS (0x20)
166 #define CyDTR (0x02)
167 #define CyRTS (0x01)
168 #define CyRTPRL (0x25)
169 #define CyRTPRH (0x24)
170 #define CyCOR1 (0x10)
171 #define CyPARITY_NONE (0x00)
172 #define CyPARITY_E (0x40)
173 #define CyPARITY_O (0xC0)
174 #define Cy_5_BITS (0x04)
175 #define Cy_6_BITS (0x05)
176 #define Cy_7_BITS (0x06)
177 #define Cy_8_BITS (0x07)
178 #define CyCOR2 (0x17)
179 #define CyETC (0x20)
180 #define CyCtsAE (0x02)
181 #define CyCOR3 (0x16)
182 #define Cy_1_STOP (0x02)
183 #define Cy_2_STOP (0x04)
184 #define CyCOR4 (0x15)
185 #define CyREC_FIFO (0x0F) /* Receive FIFO threshold */
186 #define CyCOR5 (0x14)
187 #define CyCOR6 (0x18)
188 #define CyCOR7 (0x07)
189 #define CyRBPR (0xcb)
190 #define CyRCOR (0xc8)
191 #define CyTBPR (0xc3)
192 #define CyTCOR (0xc0)
193 #define CySCHR1 (0x1f)
194 #define CySCHR2 (0x1e)
195 #define CyTPR (0xda)
196 #define CyPILR1 (0xe3)
197 #define CyPILR2 (0xe0)
198 #define CyPILR3 (0xe1)
199 #define CyCMR (0x1b)
200 #define CyASYNC (0x02)
201 #define CyLICR (0x26)
202 #define CyLIVR (0x09)
203 #define CySCRL (0x23)
204 #define CySCRH (0x22)
205 #define CyTFTC (0x80)
206
mvme16x_cons_write(struct console * co,const char * str,unsigned count)207 void mvme16x_cons_write(struct console *co, const char *str, unsigned count)
208 {
209 volatile unsigned char *base_addr = (u_char *)CD2401_ADDR;
210 u_char ier;
211 int port;
212 u_char do_lf = 0;
213 int i = 0;
214
215 /* Ensure transmitter is enabled! */
216
217 port = 0;
218 base_addr[CyCAR] = (u_char)port;
219 while (base_addr[CyCCR])
220 ;
221 base_addr[CyCCR] = CyENB_XMTR;
222
223 ier = base_addr[CyIER];
224 base_addr[CyIER] = CyTxMpty;
225
226 while (1) {
227 if (in_8(PCCSCCTICR) & 0x20)
228 {
229 /* We have a Tx int. Acknowledge it */
230 in_8(PCCTPIACKR);
231 if ((base_addr[CyLICR] >> 2) == port) {
232 if (i == count) {
233 /* Last char of string is now output */
234 base_addr[CyTEOIR] = CyNOTRANS;
235 break;
236 }
237 if (do_lf) {
238 base_addr[CyTDR] = '\n';
239 str++;
240 i++;
241 do_lf = 0;
242 }
243 else if (*str == '\n') {
244 base_addr[CyTDR] = '\r';
245 do_lf = 1;
246 }
247 else {
248 base_addr[CyTDR] = *str++;
249 i++;
250 }
251 base_addr[CyTEOIR] = 0;
252 }
253 else
254 base_addr[CyTEOIR] = CyNOTRANS;
255 }
256 }
257
258 base_addr[CyIER] = ier;
259 }
260
261 #endif
262
config_mvme16x(void)263 void __init config_mvme16x(void)
264 {
265 p_bdid p = &mvme_bdid;
266 char id[40];
267 uint16_t brdno = be16_to_cpu(p->brdno);
268
269 mach_sched_init = mvme16x_sched_init;
270 mach_init_IRQ = mvme16x_init_IRQ;
271 mach_hwclk = mvme16x_hwclk;
272 mach_reset = mvme16x_reset;
273 mach_get_model = mvme16x_get_model;
274 mach_get_hardware_list = mvme16x_get_hardware_list;
275
276 /* Report board revision */
277
278 if (strncmp("BDID", p->bdid, 4))
279 {
280 pr_crit("Bug call .BRD_ID returned garbage - giving up\n");
281 while (1)
282 ;
283 }
284 /* Board type is only set by newer versions of vmelilo/tftplilo */
285 if (vme_brdtype == 0)
286 vme_brdtype = brdno;
287
288 mvme16x_get_model(id);
289 pr_info("BRD_ID: %s BUG %x.%x %02x/%02x/%02x\n", id, p->rev >> 4,
290 p->rev & 0xf, p->yr, p->mth, p->day);
291 if (brdno == 0x0162 || brdno == 0x172)
292 {
293 unsigned char rev = *(unsigned char *)MVME162_VERSION_REG;
294
295 mvme16x_config = rev | MVME16x_CONFIG_GOT_SCCA;
296
297 pr_info("MVME%x Hardware status:\n", brdno);
298 pr_info(" CPU Type 68%s040\n",
299 rev & MVME16x_CONFIG_GOT_FPU ? "" : "LC");
300 pr_info(" CPU clock %dMHz\n",
301 rev & MVME16x_CONFIG_SPEED_32 ? 32 : 25);
302 pr_info(" VMEchip2 %spresent\n",
303 rev & MVME16x_CONFIG_NO_VMECHIP2 ? "NOT " : "");
304 pr_info(" SCSI interface %spresent\n",
305 rev & MVME16x_CONFIG_NO_SCSICHIP ? "NOT " : "");
306 pr_info(" Ethernet interface %spresent\n",
307 rev & MVME16x_CONFIG_NO_ETHERNET ? "NOT " : "");
308 }
309 else
310 {
311 mvme16x_config = MVME16x_CONFIG_GOT_LP | MVME16x_CONFIG_GOT_CD2401;
312 }
313 }
314
mvme16x_abort_int(int irq,void * dev_id)315 static irqreturn_t mvme16x_abort_int (int irq, void *dev_id)
316 {
317 unsigned long *new = (unsigned long *)vectors;
318 unsigned long *old = (unsigned long *)0xffe00000;
319 volatile unsigned char uc, *ucp;
320 uint16_t brdno = be16_to_cpu(mvme_bdid.brdno);
321
322 if (brdno == 0x0162 || brdno == 0x172)
323 {
324 ucp = (volatile unsigned char *)0xfff42043;
325 uc = *ucp | 8;
326 *ucp = uc;
327 }
328 else
329 {
330 *(volatile unsigned long *)0xfff40074 = 0x40000000;
331 }
332 *(new+4) = *(old+4); /* Illegal instruction */
333 *(new+9) = *(old+9); /* Trace */
334 *(new+47) = *(old+47); /* Trap #15 */
335
336 if (brdno == 0x0162 || brdno == 0x172)
337 *(new+0x5e) = *(old+0x5e); /* ABORT switch */
338 else
339 *(new+0x6e) = *(old+0x6e); /* ABORT switch */
340 return IRQ_HANDLED;
341 }
342
343 static u64 mvme16x_read_clk(struct clocksource *cs);
344
345 static struct clocksource mvme16x_clk = {
346 .name = "pcc",
347 .rating = 250,
348 .read = mvme16x_read_clk,
349 .mask = CLOCKSOURCE_MASK(32),
350 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
351 };
352
353 static u32 clk_total;
354
355 #define PCC_TIMER_CLOCK_FREQ 1000000
356 #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ)
357
358 #define PCCTCMP1 (PCC2CHIP + 0x04)
359 #define PCCTCNT1 (PCC2CHIP + 0x08)
360 #define PCCTOVR1 (PCC2CHIP + 0x17)
361 #define PCCTIC1 (PCC2CHIP + 0x1b)
362
363 #define PCCTOVR1_TIC_EN 0x01
364 #define PCCTOVR1_COC_EN 0x02
365 #define PCCTOVR1_OVR_CLR 0x04
366
367 #define PCCTIC1_INT_LEVEL 6
368 #define PCCTIC1_INT_CLR 0x08
369 #define PCCTIC1_INT_EN 0x10
370
mvme16x_timer_int(int irq,void * dev_id)371 static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
372 {
373 unsigned long flags;
374
375 local_irq_save(flags);
376 out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
377 out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
378 clk_total += PCC_TIMER_CYCLES;
379 legacy_timer_tick(1);
380 local_irq_restore(flags);
381
382 return IRQ_HANDLED;
383 }
384
mvme16x_sched_init(void)385 void mvme16x_sched_init(void)
386 {
387 uint16_t brdno = be16_to_cpu(mvme_bdid.brdno);
388 int irq;
389
390 /* Using PCCchip2 or MC2 chip tick timer 1 */
391 if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, IRQF_TIMER, "timer",
392 NULL))
393 panic ("Couldn't register timer int");
394
395 out_be32(PCCTCNT1, 0);
396 out_be32(PCCTCMP1, PCC_TIMER_CYCLES);
397 out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
398 out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
399
400 clocksource_register_hz(&mvme16x_clk, PCC_TIMER_CLOCK_FREQ);
401
402 if (brdno == 0x0162 || brdno == 0x172)
403 irq = MVME162_IRQ_ABORT;
404 else
405 irq = MVME167_IRQ_ABORT;
406 if (request_irq(irq, mvme16x_abort_int, 0,
407 "abort", mvme16x_abort_int))
408 panic ("Couldn't register abort int");
409 }
410
mvme16x_read_clk(struct clocksource * cs)411 static u64 mvme16x_read_clk(struct clocksource *cs)
412 {
413 unsigned long flags;
414 u8 overflow, tmp;
415 u32 ticks;
416
417 local_irq_save(flags);
418 tmp = in_8(PCCTOVR1) >> 4;
419 ticks = in_be32(PCCTCNT1);
420 overflow = in_8(PCCTOVR1) >> 4;
421 if (overflow != tmp)
422 ticks = in_be32(PCCTCNT1);
423 ticks += overflow * PCC_TIMER_CYCLES;
424 ticks += clk_total;
425 local_irq_restore(flags);
426
427 return ticks;
428 }
429
bcd2int(unsigned char b)430 int bcd2int (unsigned char b)
431 {
432 return ((b>>4)*10 + (b&15));
433 }
434
mvme16x_hwclk(int op,struct rtc_time * t)435 int mvme16x_hwclk(int op, struct rtc_time *t)
436 {
437 if (!op) {
438 rtc->ctrl = RTC_READ;
439 t->tm_year = bcd2int (rtc->bcd_year);
440 t->tm_mon = bcd2int(rtc->bcd_mth) - 1;
441 t->tm_mday = bcd2int (rtc->bcd_dom);
442 t->tm_hour = bcd2int (rtc->bcd_hr);
443 t->tm_min = bcd2int (rtc->bcd_min);
444 t->tm_sec = bcd2int (rtc->bcd_sec);
445 rtc->ctrl = 0;
446 if (t->tm_year < 70)
447 t->tm_year += 100;
448 } else {
449 /* FIXME Setting the time is not yet supported */
450 return -EOPNOTSUPP;
451 }
452 return 0;
453 }
454