1/*
2 *  arch/m68k/bvme6000/config.c
3 *
4 *  Copyright (C) 1997 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/tty.h>
21#include <linux/console.h>
22#include <linux/linkage.h>
23#include <linux/init.h>
24#include <linux/major.h>
25#include <linux/rtc.h>
26
27#include <asm/bootinfo.h>
28#include <asm/system.h>
29#include <asm/pgtable.h>
30#include <asm/setup.h>
31#include <asm/irq.h>
32#include <asm/traps.h>
33#include <asm/rtc.h>
34#include <asm/machdep.h>
35#include <asm/bvme6000hw.h>
36
37extern void bvme6000_process_int (int level, struct pt_regs *regs);
38extern void bvme6000_init_IRQ (void);
39extern void bvme6000_free_irq (unsigned int, void *);
40extern int  bvme6000_get_irq_list (char *);
41extern void bvme6000_enable_irq (unsigned int);
42extern void bvme6000_disable_irq (unsigned int);
43static void bvme6000_get_model(char *model);
44static int  bvme6000_get_hardware_list(char *buffer);
45extern int  bvme6000_request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
46extern void bvme6000_sched_init(void (*handler)(int, void *, struct pt_regs *));
47extern int  bvme6000_keyb_init(void);
48extern int  bvme6000_kbdrate (struct kbd_repeat *);
49extern unsigned long bvme6000_gettimeoffset (void);
50extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
51                           int *min, int *sec);
52extern int bvme6000_hwclk (int, struct rtc_time *);
53extern int bvme6000_set_clock_mmss (unsigned long);
54extern void bvme6000_check_partition (struct gendisk *hd, unsigned int dev);
55extern void bvme6000_mksound( unsigned int count, unsigned int ticks );
56extern void bvme6000_reset (void);
57extern void bvme6000_waitbut(void);
58void bvme6000_set_vectors (void);
59
60static unsigned char bcd2bin (unsigned char b);
61static unsigned char bin2bcd (unsigned char b);
62
63/* Save tick handler routine pointer, will point to do_timer() in
64 * kernel/sched.c, called via bvme6000_process_int() */
65
66static void (*tick_handler)(int, void *, struct pt_regs *);
67
68
69int bvme6000_parse_bootinfo(const struct bi_record *bi)
70{
71	if (bi->tag == BI_VME_TYPE)
72		return 0;
73	else
74		return 1;
75}
76
77int bvme6000_kbdrate (struct kbd_repeat *k)
78{
79	return 0;
80}
81
82void bvme6000_mksound( unsigned int count, unsigned int ticks )
83{
84}
85
86void bvme6000_reset()
87{
88	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
89
90	printk ("\r\n\nCalled bvme6000_reset\r\n"
91			"\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
92	/* The string of returns is to delay the reset until the whole
93	 * message is output. */
94	/* Enable the watchdog, via PIT port C bit 4 */
95
96	pit->pcddr	|= 0x10;	/* WDOG enable */
97
98	while(1)
99		;
100}
101
102static void bvme6000_get_model(char *model)
103{
104    sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
105}
106
107
108/* No hardware options on BVME6000? */
109
110static int bvme6000_get_hardware_list(char *buffer)
111{
112    *buffer = '\0';
113    return 0;
114}
115
116
117void __init config_bvme6000(void)
118{
119    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
120
121    /* Board type is only set by newer versions of vmelilo/tftplilo */
122    if (!vme_brdtype) {
123	if (m68k_cputype == CPU_68060)
124	    vme_brdtype = VME_TYPE_BVME6000;
125	else
126	    vme_brdtype = VME_TYPE_BVME4000;
127    }
128
129    mach_max_dma_address = 0xffffffff;
130    mach_sched_init      = bvme6000_sched_init;
131#ifdef CONFIG_VT
132    mach_keyb_init       = bvme6000_keyb_init;
133    mach_kbdrate         = bvme6000_kbdrate;
134#endif
135    mach_init_IRQ        = bvme6000_init_IRQ;
136    mach_gettimeoffset   = bvme6000_gettimeoffset;
137    mach_gettod  	 = bvme6000_gettod;
138    mach_hwclk           = bvme6000_hwclk;
139    mach_set_clock_mmss	 = bvme6000_set_clock_mmss;
140/*  mach_mksound         = bvme6000_mksound; */
141    mach_reset		 = bvme6000_reset;
142    mach_free_irq	 = bvme6000_free_irq;
143    mach_process_int	 = bvme6000_process_int;
144    mach_get_irq_list	 = bvme6000_get_irq_list;
145    mach_request_irq	 = bvme6000_request_irq;
146    enable_irq		 = bvme6000_enable_irq;
147    disable_irq          = bvme6000_disable_irq;
148    mach_get_model       = bvme6000_get_model;
149    mach_get_hardware_list = bvme6000_get_hardware_list;
150
151    printk ("Board is %sconfigured as a System Controller\n",
152		*config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
153
154    /* Now do the PIT configuration */
155
156    pit->pgcr	= 0x00;	/* Unidirectional 8 bit, no handshake for now */
157    pit->psrr	= 0x18;	/* PIACK and PIRQ fucntions enabled */
158    pit->pacr	= 0x00;	/* Sub Mode 00, H2 i/p, no DMA */
159    pit->padr	= 0x00;	/* Just to be tidy! */
160    pit->paddr	= 0x00;	/* All inputs for now (safest) */
161    pit->pbcr	= 0x80;	/* Sub Mode 1x, H4 i/p, no DMA */
162    pit->pbdr	= 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
163			/* PRI, SYSCON?, Level3, SCC clks from xtal */
164    pit->pbddr	= 0xf3;	/* Mostly outputs */
165    pit->pcdr	= 0x01;	/* PA transceiver disabled */
166    pit->pcddr	= 0x03;	/* WDOG disable */
167
168    /* Disable snooping for Ethernet and VME accesses */
169
170    bvme_acr_addrctl = 0;
171}
172
173
174void bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp)
175{
176        unsigned long *new = (unsigned long *)vectors;
177        unsigned long *old = (unsigned long *)0xf8000000;
178
179        /* Wait for button release */
180        while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
181                ;
182
183        *(new+4) = *(old+4);            /* Illegal instruction */
184        *(new+9) = *(old+9);            /* Trace */
185        *(new+47) = *(old+47);          /* Trap #15 */
186        *(new+0x1f) = *(old+0x1f);      /* ABORT switch */
187}
188
189
190static void bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp)
191{
192    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
193    unsigned char msr = rtc->msr & 0xc0;
194
195    rtc->msr = msr | 0x20;		/* Ack the interrupt */
196
197    tick_handler(irq, dev_id, fp);
198}
199
200/*
201 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
202 * (40000 x 125ns).  It will interrupt every 10ms, when T1 goes low.
203 * So, when reading the elapsed time, you should read timer1,
204 * subtract it from 39999, and then add 40000 if T1 is high.
205 * That gives you the number of 125ns ticks in to the 10ms period,
206 * so divide by 8 to get the microsecond result.
207 */
208
209void bvme6000_sched_init (void (*timer_routine)(int, void *, struct pt_regs *))
210{
211    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
212    unsigned char msr = rtc->msr & 0xc0;
213
214    rtc->msr = 0;	/* Ensure timer registers accessible */
215
216    tick_handler = timer_routine;
217    if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
218				"timer", bvme6000_timer_int))
219	panic ("Couldn't register timer int");
220
221    rtc->t1cr_omr = 0x04;	/* Mode 2, ext clk */
222    rtc->t1msb = 39999 >> 8;
223    rtc->t1lsb = 39999 & 0xff;
224    rtc->irr_icr1 &= 0xef;	/* Route timer 1 to INTR pin */
225    rtc->msr = 0x40;		/* Access int.cntrl, etc */
226    rtc->pfr_icr0 = 0x80;	/* Just timer 1 ints enabled */
227    rtc->irr_icr1 = 0;
228    rtc->t1cr_omr = 0x0a;	/* INTR+T1 active lo, push-pull */
229    rtc->t0cr_rtmr &= 0xdf;	/* Stop timers in standby */
230    rtc->msr = 0;		/* Access timer 1 control */
231    rtc->t1cr_omr = 0x05;	/* Mode 2, ext clk, GO */
232
233    rtc->msr = msr;
234
235    if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
236				"abort", bvme6000_abort_int))
237	panic ("Couldn't register abort int");
238}
239
240
241/* This is always executed with interrupts disabled.  */
242
243/*
244 * NOTE:  Don't accept any readings within 5us of rollover, as
245 * the T1INT bit may be a little slow getting set.  There is also
246 * a fault in the chip, meaning that reads may produce invalid
247 * results...
248 */
249
250unsigned long bvme6000_gettimeoffset (void)
251{
252    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
253    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
254    unsigned char msr = rtc->msr & 0xc0;
255    unsigned char t1int, t1op;
256    unsigned long v = 800000, ov;
257
258    rtc->msr = 0;	/* Ensure timer registers accessible */
259
260    do {
261	ov = v;
262	t1int = rtc->msr & 0x20;
263	t1op  = pit->pcdr & 0x04;
264	rtc->t1cr_omr |= 0x40;		/* Latch timer1 */
265	v = rtc->t1msb << 8;		/* Read timer1 */
266	v |= rtc->t1lsb;		/* Read timer1 */
267    } while (t1int != (rtc->msr & 0x20) ||
268		t1op != (pit->pcdr & 0x04) ||
269			abs(ov-v) > 80 ||
270				v > 39960);
271
272    v = 39999 - v;
273    if (!t1op)				/* If in second half cycle.. */
274	v += 40000;
275    v /= 8;				/* Convert ticks to microseconds */
276    if (t1int)
277	v += 10000;			/* Int pending, + 10ms */
278    rtc->msr = msr;
279
280    return v;
281}
282
283extern void bvme6000_gettod (int *year, int *mon, int *day, int *hour,
284                           int *min, int *sec)
285{
286	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
287	unsigned char msr = rtc->msr & 0xc0;
288
289	rtc->msr = 0;		/* Ensure clock accessible */
290
291	do {	/* Loop until we get a reading with a stable seconds field */
292		*sec = bcd2bin (rtc->bcd_sec);
293		*min = bcd2bin (rtc->bcd_min);
294		*hour = bcd2bin (rtc->bcd_hr);
295		*day = bcd2bin (rtc->bcd_dom);
296		*mon = bcd2bin (rtc->bcd_mth);
297		*year = bcd2bin (rtc->bcd_year);
298	} while (bcd2bin (rtc->bcd_sec) != *sec);
299
300	rtc->msr = msr;
301}
302
303static unsigned char bcd2bin (unsigned char b)
304{
305	return ((b>>4)*10 + (b&15));
306}
307
308static unsigned char bin2bcd (unsigned char b)
309{
310	return (((b/10)*16) + (b%10));
311}
312
313
314/*
315 * Looks like op is non-zero for setting the clock, and zero for
316 * reading the clock.
317 *
318 *  struct hwclk_time {
319 *         unsigned        sec;       0..59
320 *         unsigned        min;       0..59
321 *         unsigned        hour;      0..23
322 *         unsigned        day;       1..31
323 *         unsigned        mon;       0..11
324 *         unsigned        year;      00...
325 *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
326 * };
327 */
328
329int bvme6000_hwclk(int op, struct rtc_time *t)
330{
331	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
332	unsigned char msr = rtc->msr & 0xc0;
333
334	rtc->msr = 0x40;	/* Ensure clock and real-time-mode-register
335				 * are accessible */
336	if (op)
337	{	/* Write.... */
338		rtc->t0cr_rtmr = t->tm_year%4;
339		rtc->bcd_tenms = 0;
340		rtc->bcd_sec = bin2bcd(t->tm_sec);
341		rtc->bcd_min = bin2bcd(t->tm_min);
342		rtc->bcd_hr  = bin2bcd(t->tm_hour);
343		rtc->bcd_dom = bin2bcd(t->tm_mday);
344		rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
345		rtc->bcd_year = bin2bcd(t->tm_year%100);
346		if (t->tm_wday >= 0)
347			rtc->bcd_dow = bin2bcd(t->tm_wday+1);
348		rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
349	}
350	else
351	{	/* Read....  */
352		do {
353			t->tm_sec  = bcd2bin(rtc->bcd_sec);
354			t->tm_min  = bcd2bin(rtc->bcd_min);
355			t->tm_hour = bcd2bin(rtc->bcd_hr);
356			t->tm_mday = bcd2bin(rtc->bcd_dom);
357			t->tm_mon  = bcd2bin(rtc->bcd_mth)-1;
358			t->tm_year = bcd2bin(rtc->bcd_year);
359			if (t->tm_year < 70)
360				t->tm_year += 100;
361			t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
362		} while (t->tm_sec != bcd2bin(rtc->bcd_sec));
363	}
364
365	rtc->msr = msr;
366
367	return 0;
368}
369
370/*
371 * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
372 * clock is out by > 30 minutes.  Logic lifted from atari code.
373 * Algorithm is to wait for the 10ms register to change, and then to
374 * wait a short while, and then set it.
375 */
376
377int bvme6000_set_clock_mmss (unsigned long nowtime)
378{
379	int retval = 0;
380	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
381	unsigned char rtc_minutes, rtc_tenms;
382	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
383	unsigned char msr = rtc->msr & 0xc0;
384	unsigned long flags;
385	volatile int i;
386
387	rtc->msr = 0;		/* Ensure clock accessible */
388	rtc_minutes = bcd2bin (rtc->bcd_min);
389
390	if ((rtc_minutes < real_minutes
391		? real_minutes - rtc_minutes
392			: rtc_minutes - real_minutes) < 30)
393	{
394		save_flags(flags);
395		cli();
396		rtc_tenms = rtc->bcd_tenms;
397		while (rtc_tenms == rtc->bcd_tenms)
398			;
399		for (i = 0; i < 1000; i++)
400			;
401		rtc->bcd_min = bin2bcd(real_minutes);
402		rtc->bcd_sec = bin2bcd(real_seconds);
403		restore_flags(flags);
404	}
405	else
406		retval = -1;
407
408	rtc->msr = msr;
409
410	return retval;
411}
412
413
414int bvme6000_keyb_init (void)
415{
416	return 0;
417}
418