xref: /linux/arch/m68k/mvme16x/config.c (revision a5359ddd052860bacf957e65fe819c63e974b3a6)
1 /*
2  *  arch/m68k/mvme16x/config.c
3  *
4  *  Copyright (C) 1995 Richard Hirst [richard@sleepie.demon.co.uk]
5  *
6  * Based on:
7  *
8  *  linux/amiga/config.c
9  *
10  *  Copyright (C) 1993 Hamish Macdonald
11  *
12  * This file is subject to the terms and conditions of the GNU General Public
13  * License.  See the file README.legal in the main directory of this archive
14  * for more details.
15  */
16 
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/mm.h>
20 #include <linux/seq_file.h>
21 #include <linux/tty.h>
22 #include <linux/clocksource.h>
23 #include <linux/console.h>
24 #include <linux/linkage.h>
25 #include <linux/init.h>
26 #include <linux/major.h>
27 #include <linux/rtc.h>
28 #include <linux/interrupt.h>
29 #include <linux/module.h>
30 
31 #include <asm/bootinfo.h>
32 #include <asm/bootinfo-vme.h>
33 #include <asm/byteorder.h>
34 #include <asm/setup.h>
35 #include <asm/irq.h>
36 #include <asm/traps.h>
37 #include <asm/machdep.h>
38 #include <asm/mvme16xhw.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 
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 
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 
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 
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 
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 
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 	volatile u_char sink;
211 	u_char ier;
212 	int port;
213 	u_char do_lf = 0;
214 	int i = 0;
215 
216 	/* Ensure transmitter is enabled! */
217 
218 	port = 0;
219 	base_addr[CyCAR] = (u_char)port;
220 	while (base_addr[CyCCR])
221 		;
222 	base_addr[CyCCR] = CyENB_XMTR;
223 
224 	ier = base_addr[CyIER];
225 	base_addr[CyIER] = CyTxMpty;
226 
227 	while (1) {
228 		if (in_8(PCCSCCTICR) & 0x20)
229 		{
230 			/* We have a Tx int. Acknowledge it */
231 			sink = in_8(PCCTPIACKR);
232 			if ((base_addr[CyLICR] >> 2) == port) {
233 				if (i == count) {
234 					/* Last char of string is now output */
235 					base_addr[CyTEOIR] = CyNOTRANS;
236 					break;
237 				}
238 				if (do_lf) {
239 					base_addr[CyTDR] = '\n';
240 					str++;
241 					i++;
242 					do_lf = 0;
243 				}
244 				else if (*str == '\n') {
245 					base_addr[CyTDR] = '\r';
246 					do_lf = 1;
247 				}
248 				else {
249 					base_addr[CyTDR] = *str++;
250 					i++;
251 				}
252 				base_addr[CyTEOIR] = 0;
253 			}
254 			else
255 				base_addr[CyTEOIR] = CyNOTRANS;
256 		}
257 	}
258 
259 	base_addr[CyIER] = ier;
260 }
261 
262 #endif
263 
264 void __init config_mvme16x(void)
265 {
266     p_bdid p = &mvme_bdid;
267     char id[40];
268     uint16_t brdno = be16_to_cpu(p->brdno);
269 
270     mach_sched_init      = mvme16x_sched_init;
271     mach_init_IRQ        = mvme16x_init_IRQ;
272     mach_hwclk           = mvme16x_hwclk;
273     mach_reset		 = mvme16x_reset;
274     mach_get_model       = mvme16x_get_model;
275     mach_get_hardware_list = mvme16x_get_hardware_list;
276 
277     /* Report board revision */
278 
279     if (strncmp("BDID", p->bdid, 4))
280     {
281 	pr_crit("Bug call .BRD_ID returned garbage - giving up\n");
282 	while (1)
283 		;
284     }
285     /* Board type is only set by newer versions of vmelilo/tftplilo */
286     if (vme_brdtype == 0)
287 	vme_brdtype = brdno;
288 
289     mvme16x_get_model(id);
290     pr_info("BRD_ID: %s   BUG %x.%x %02x/%02x/%02x\n", id, p->rev >> 4,
291 	    p->rev & 0xf, p->yr, p->mth, p->day);
292     if (brdno == 0x0162 || brdno == 0x172)
293     {
294 	unsigned char rev = *(unsigned char *)MVME162_VERSION_REG;
295 
296 	mvme16x_config = rev | MVME16x_CONFIG_GOT_SCCA;
297 
298 	pr_info("MVME%x Hardware status:\n", brdno);
299 	pr_info("    CPU Type           68%s040\n",
300 		rev & MVME16x_CONFIG_GOT_FPU ? "" : "LC");
301 	pr_info("    CPU clock          %dMHz\n",
302 		rev & MVME16x_CONFIG_SPEED_32 ? 32 : 25);
303 	pr_info("    VMEchip2           %spresent\n",
304 		rev & MVME16x_CONFIG_NO_VMECHIP2 ? "NOT " : "");
305 	pr_info("    SCSI interface     %spresent\n",
306 		rev & MVME16x_CONFIG_NO_SCSICHIP ? "NOT " : "");
307 	pr_info("    Ethernet interface %spresent\n",
308 		rev & MVME16x_CONFIG_NO_ETHERNET ? "NOT " : "");
309     }
310     else
311     {
312 	mvme16x_config = MVME16x_CONFIG_GOT_LP | MVME16x_CONFIG_GOT_CD2401;
313     }
314 }
315 
316 static irqreturn_t mvme16x_abort_int (int irq, void *dev_id)
317 {
318 	unsigned long *new = (unsigned long *)vectors;
319 	unsigned long *old = (unsigned long *)0xffe00000;
320 	volatile unsigned char uc, *ucp;
321 	uint16_t brdno = be16_to_cpu(mvme_bdid.brdno);
322 
323 	if (brdno == 0x0162 || brdno == 0x172)
324 	{
325 		ucp = (volatile unsigned char *)0xfff42043;
326 		uc = *ucp | 8;
327 		*ucp = uc;
328 	}
329 	else
330 	{
331 		*(volatile unsigned long *)0xfff40074 = 0x40000000;
332 	}
333 	*(new+4) = *(old+4);		/* Illegal instruction */
334 	*(new+9) = *(old+9);		/* Trace */
335 	*(new+47) = *(old+47);		/* Trap #15 */
336 
337 	if (brdno == 0x0162 || brdno == 0x172)
338 		*(new+0x5e) = *(old+0x5e);	/* ABORT switch */
339 	else
340 		*(new+0x6e) = *(old+0x6e);	/* ABORT switch */
341 	return IRQ_HANDLED;
342 }
343 
344 static u64 mvme16x_read_clk(struct clocksource *cs);
345 
346 static struct clocksource mvme16x_clk = {
347 	.name   = "pcc",
348 	.rating = 250,
349 	.read   = mvme16x_read_clk,
350 	.mask   = CLOCKSOURCE_MASK(32),
351 	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
352 };
353 
354 static u32 clk_total;
355 
356 #define PCC_TIMER_CLOCK_FREQ 1000000
357 #define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
358 
359 #define PCCTCMP1             (PCC2CHIP + 0x04)
360 #define PCCTCNT1             (PCC2CHIP + 0x08)
361 #define PCCTOVR1             (PCC2CHIP + 0x17)
362 #define PCCTIC1              (PCC2CHIP + 0x1b)
363 
364 #define PCCTOVR1_TIC_EN      0x01
365 #define PCCTOVR1_COC_EN      0x02
366 #define PCCTOVR1_OVR_CLR     0x04
367 
368 #define PCCTIC1_INT_LEVEL    6
369 #define PCCTIC1_INT_CLR      0x08
370 #define PCCTIC1_INT_EN       0x10
371 
372 static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
373 {
374 	unsigned long flags;
375 
376 	local_irq_save(flags);
377 	out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
378 	out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
379 	clk_total += PCC_TIMER_CYCLES;
380 	legacy_timer_tick(1);
381 	local_irq_restore(flags);
382 
383 	return IRQ_HANDLED;
384 }
385 
386 void mvme16x_sched_init(void)
387 {
388     uint16_t brdno = be16_to_cpu(mvme_bdid.brdno);
389     int irq;
390 
391     /* Using PCCchip2 or MC2 chip tick timer 1 */
392     if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, IRQF_TIMER, "timer",
393                     NULL))
394 	panic ("Couldn't register timer int");
395 
396     out_be32(PCCTCNT1, 0);
397     out_be32(PCCTCMP1, PCC_TIMER_CYCLES);
398     out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
399     out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
400 
401     clocksource_register_hz(&mvme16x_clk, PCC_TIMER_CLOCK_FREQ);
402 
403     if (brdno == 0x0162 || brdno == 0x172)
404 	irq = MVME162_IRQ_ABORT;
405     else
406         irq = MVME167_IRQ_ABORT;
407     if (request_irq(irq, mvme16x_abort_int, 0,
408 				"abort", mvme16x_abort_int))
409 	panic ("Couldn't register abort int");
410 }
411 
412 static u64 mvme16x_read_clk(struct clocksource *cs)
413 {
414 	unsigned long flags;
415 	u8 overflow, tmp;
416 	u32 ticks;
417 
418 	local_irq_save(flags);
419 	tmp = in_8(PCCTOVR1) >> 4;
420 	ticks = in_be32(PCCTCNT1);
421 	overflow = in_8(PCCTOVR1) >> 4;
422 	if (overflow != tmp)
423 		ticks = in_be32(PCCTCNT1);
424 	ticks += overflow * PCC_TIMER_CYCLES;
425 	ticks += clk_total;
426 	local_irq_restore(flags);
427 
428 	return ticks;
429 }
430 
431 int bcd2int (unsigned char b)
432 {
433 	return ((b>>4)*10 + (b&15));
434 }
435 
436 int mvme16x_hwclk(int op, struct rtc_time *t)
437 {
438 	if (!op) {
439 		rtc->ctrl = RTC_READ;
440 		t->tm_year = bcd2int (rtc->bcd_year);
441 		t->tm_mon  = bcd2int(rtc->bcd_mth) - 1;
442 		t->tm_mday = bcd2int (rtc->bcd_dom);
443 		t->tm_hour = bcd2int (rtc->bcd_hr);
444 		t->tm_min  = bcd2int (rtc->bcd_min);
445 		t->tm_sec  = bcd2int (rtc->bcd_sec);
446 		rtc->ctrl = 0;
447 		if (t->tm_year < 70)
448 			t->tm_year += 100;
449 	} else {
450 		/* FIXME Setting the time is not yet supported */
451 		return -EOPNOTSUPP;
452 	}
453 	return 0;
454 }
455