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/genhd.h>
26#include <linux/rtc.h>
27#include <linux/interrupt.h>
28#include <linux/bcd.h>
29
30#include <asm/bootinfo.h>
31#include <asm/bootinfo-vme.h>
32#include <asm/byteorder.h>
33#include <asm/pgtable.h>
34#include <asm/setup.h>
35#include <asm/irq.h>
36#include <asm/traps.h>
37#include <asm/rtc.h>
38#include <asm/machdep.h>
39#include <asm/bvme6000hw.h>
40
41static void bvme6000_get_model(char *model);
42extern void bvme6000_sched_init(irq_handler_t handler);
43extern u32 bvme6000_gettimeoffset(void);
44extern int bvme6000_hwclk (int, struct rtc_time *);
45extern int bvme6000_set_clock_mmss (unsigned long);
46extern void bvme6000_reset (void);
47void bvme6000_set_vectors (void);
48
49/* Save tick handler routine pointer, will point to xtime_update() in
50 * kernel/timer/timekeeping.c, called via bvme6000_process_int() */
51
52static irq_handler_t tick_handler;
53
54
55int __init bvme6000_parse_bootinfo(const struct bi_record *bi)
56{
57	if (be16_to_cpu(bi->tag) == BI_VME_TYPE)
58		return 0;
59	else
60		return 1;
61}
62
63void bvme6000_reset(void)
64{
65	volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
66
67	printk ("\r\n\nCalled bvme6000_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. */
71	/* Enable the watchdog, via PIT port C bit 4 */
72
73	pit->pcddr	|= 0x10;	/* WDOG enable */
74
75	while(1)
76		;
77}
78
79static void bvme6000_get_model(char *model)
80{
81    sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
82}
83
84/*
85 * This function is called during kernel startup to initialize
86 * the bvme6000 IRQ handling routines.
87 */
88static void __init bvme6000_init_IRQ(void)
89{
90	m68k_setup_user_interrupt(VEC_USER, 192);
91}
92
93void __init config_bvme6000(void)
94{
95    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
96
97    /* Board type is only set by newer versions of vmelilo/tftplilo */
98    if (!vme_brdtype) {
99	if (m68k_cputype == CPU_68060)
100	    vme_brdtype = VME_TYPE_BVME6000;
101	else
102	    vme_brdtype = VME_TYPE_BVME4000;
103    }
104#if 0
105    /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
106     * debugger.  Note trap_init() will splat the abort vector, but
107     * bvme6000_init_IRQ() will put it back again.  Hopefully. */
108
109    bvme6000_set_vectors();
110#endif
111
112    mach_max_dma_address = 0xffffffff;
113    mach_sched_init      = bvme6000_sched_init;
114    mach_init_IRQ        = bvme6000_init_IRQ;
115    arch_gettimeoffset   = bvme6000_gettimeoffset;
116    mach_hwclk           = bvme6000_hwclk;
117    mach_set_clock_mmss	 = bvme6000_set_clock_mmss;
118    mach_reset		 = bvme6000_reset;
119    mach_get_model       = bvme6000_get_model;
120
121    printk ("Board is %sconfigured as a System Controller\n",
122		*config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
123
124    /* Now do the PIT configuration */
125
126    pit->pgcr	= 0x00;	/* Unidirectional 8 bit, no handshake for now */
127    pit->psrr	= 0x18;	/* PIACK and PIRQ functions enabled */
128    pit->pacr	= 0x00;	/* Sub Mode 00, H2 i/p, no DMA */
129    pit->padr	= 0x00;	/* Just to be tidy! */
130    pit->paddr	= 0x00;	/* All inputs for now (safest) */
131    pit->pbcr	= 0x80;	/* Sub Mode 1x, H4 i/p, no DMA */
132    pit->pbdr	= 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
133			/* PRI, SYSCON?, Level3, SCC clks from xtal */
134    pit->pbddr	= 0xf3;	/* Mostly outputs */
135    pit->pcdr	= 0x01;	/* PA transceiver disabled */
136    pit->pcddr	= 0x03;	/* WDOG disable */
137
138    /* Disable snooping for Ethernet and VME accesses */
139
140    bvme_acr_addrctl = 0;
141}
142
143
144irqreturn_t bvme6000_abort_int (int irq, void *dev_id)
145{
146        unsigned long *new = (unsigned long *)vectors;
147        unsigned long *old = (unsigned long *)0xf8000000;
148
149        /* Wait for button release */
150        while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
151                ;
152
153        *(new+4) = *(old+4);            /* Illegal instruction */
154        *(new+9) = *(old+9);            /* Trace */
155        *(new+47) = *(old+47);          /* Trap #15 */
156        *(new+0x1f) = *(old+0x1f);      /* ABORT switch */
157	return IRQ_HANDLED;
158}
159
160
161static irqreturn_t bvme6000_timer_int (int irq, void *dev_id)
162{
163    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
164    unsigned char msr = rtc->msr & 0xc0;
165
166    rtc->msr = msr | 0x20;		/* Ack the interrupt */
167
168    return tick_handler(irq, dev_id);
169}
170
171/*
172 * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
173 * (40000 x 125ns).  It will interrupt every 10ms, when T1 goes low.
174 * So, when reading the elapsed time, you should read timer1,
175 * subtract it from 39999, and then add 40000 if T1 is high.
176 * That gives you the number of 125ns ticks in to the 10ms period,
177 * so divide by 8 to get the microsecond result.
178 */
179
180void bvme6000_sched_init (irq_handler_t timer_routine)
181{
182    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
183    unsigned char msr = rtc->msr & 0xc0;
184
185    rtc->msr = 0;	/* Ensure timer registers accessible */
186
187    tick_handler = timer_routine;
188    if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
189				"timer", bvme6000_timer_int))
190	panic ("Couldn't register timer int");
191
192    rtc->t1cr_omr = 0x04;	/* Mode 2, ext clk */
193    rtc->t1msb = 39999 >> 8;
194    rtc->t1lsb = 39999 & 0xff;
195    rtc->irr_icr1 &= 0xef;	/* Route timer 1 to INTR pin */
196    rtc->msr = 0x40;		/* Access int.cntrl, etc */
197    rtc->pfr_icr0 = 0x80;	/* Just timer 1 ints enabled */
198    rtc->irr_icr1 = 0;
199    rtc->t1cr_omr = 0x0a;	/* INTR+T1 active lo, push-pull */
200    rtc->t0cr_rtmr &= 0xdf;	/* Stop timers in standby */
201    rtc->msr = 0;		/* Access timer 1 control */
202    rtc->t1cr_omr = 0x05;	/* Mode 2, ext clk, GO */
203
204    rtc->msr = msr;
205
206    if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
207				"abort", bvme6000_abort_int))
208	panic ("Couldn't register abort int");
209}
210
211
212/* This is always executed with interrupts disabled.  */
213
214/*
215 * NOTE:  Don't accept any readings within 5us of rollover, as
216 * the T1INT bit may be a little slow getting set.  There is also
217 * a fault in the chip, meaning that reads may produce invalid
218 * results...
219 */
220
221u32 bvme6000_gettimeoffset(void)
222{
223    volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
224    volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
225    unsigned char msr = rtc->msr & 0xc0;
226    unsigned char t1int, t1op;
227    u32 v = 800000, ov;
228
229    rtc->msr = 0;	/* Ensure timer registers accessible */
230
231    do {
232	ov = v;
233	t1int = rtc->msr & 0x20;
234	t1op  = pit->pcdr & 0x04;
235	rtc->t1cr_omr |= 0x40;		/* Latch timer1 */
236	v = rtc->t1msb << 8;		/* Read timer1 */
237	v |= rtc->t1lsb;		/* Read timer1 */
238    } while (t1int != (rtc->msr & 0x20) ||
239		t1op != (pit->pcdr & 0x04) ||
240			abs(ov-v) > 80 ||
241				v > 39960);
242
243    v = 39999 - v;
244    if (!t1op)				/* If in second half cycle.. */
245	v += 40000;
246    v /= 8;				/* Convert ticks to microseconds */
247    if (t1int)
248	v += 10000;			/* Int pending, + 10ms */
249    rtc->msr = msr;
250
251    return v * 1000;
252}
253
254/*
255 * Looks like op is non-zero for setting the clock, and zero for
256 * reading the clock.
257 *
258 *  struct hwclk_time {
259 *         unsigned        sec;       0..59
260 *         unsigned        min;       0..59
261 *         unsigned        hour;      0..23
262 *         unsigned        day;       1..31
263 *         unsigned        mon;       0..11
264 *         unsigned        year;      00...
265 *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
266 * };
267 */
268
269int bvme6000_hwclk(int op, struct rtc_time *t)
270{
271	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
272	unsigned char msr = rtc->msr & 0xc0;
273
274	rtc->msr = 0x40;	/* Ensure clock and real-time-mode-register
275				 * are accessible */
276	if (op)
277	{	/* Write.... */
278		rtc->t0cr_rtmr = t->tm_year%4;
279		rtc->bcd_tenms = 0;
280		rtc->bcd_sec = bin2bcd(t->tm_sec);
281		rtc->bcd_min = bin2bcd(t->tm_min);
282		rtc->bcd_hr  = bin2bcd(t->tm_hour);
283		rtc->bcd_dom = bin2bcd(t->tm_mday);
284		rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
285		rtc->bcd_year = bin2bcd(t->tm_year%100);
286		if (t->tm_wday >= 0)
287			rtc->bcd_dow = bin2bcd(t->tm_wday+1);
288		rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
289	}
290	else
291	{	/* Read....  */
292		do {
293			t->tm_sec  = bcd2bin(rtc->bcd_sec);
294			t->tm_min  = bcd2bin(rtc->bcd_min);
295			t->tm_hour = bcd2bin(rtc->bcd_hr);
296			t->tm_mday = bcd2bin(rtc->bcd_dom);
297			t->tm_mon  = bcd2bin(rtc->bcd_mth)-1;
298			t->tm_year = bcd2bin(rtc->bcd_year);
299			if (t->tm_year < 70)
300				t->tm_year += 100;
301			t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
302		} while (t->tm_sec != bcd2bin(rtc->bcd_sec));
303	}
304
305	rtc->msr = msr;
306
307	return 0;
308}
309
310/*
311 * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
312 * clock is out by > 30 minutes.  Logic lifted from atari code.
313 * Algorithm is to wait for the 10ms register to change, and then to
314 * wait a short while, and then set it.
315 */
316
317int bvme6000_set_clock_mmss (unsigned long nowtime)
318{
319	int retval = 0;
320	short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
321	unsigned char rtc_minutes, rtc_tenms;
322	volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
323	unsigned char msr = rtc->msr & 0xc0;
324	unsigned long flags;
325	volatile int i;
326
327	rtc->msr = 0;		/* Ensure clock accessible */
328	rtc_minutes = bcd2bin (rtc->bcd_min);
329
330	if ((rtc_minutes < real_minutes
331		? real_minutes - rtc_minutes
332			: rtc_minutes - real_minutes) < 30)
333	{
334		local_irq_save(flags);
335		rtc_tenms = rtc->bcd_tenms;
336		while (rtc_tenms == rtc->bcd_tenms)
337			;
338		for (i = 0; i < 1000; i++)
339			;
340		rtc->bcd_min = bin2bcd(real_minutes);
341		rtc->bcd_sec = bin2bcd(real_seconds);
342		local_irq_restore(flags);
343	}
344	else
345		retval = -1;
346
347	rtc->msr = msr;
348
349	return retval;
350}
351
352