1/*
2 *  arch/m68k/mvme147/config.c
3 *
4 *  Copyright (C) 1996 Dave Frascone [chaos@mindspring.com]
5 *  Cloned from        Richard Hirst [richard@sleepie.demon.co.uk]
6 *
7 * Based on:
8 *
9 *  Copyright (C) 1993 Hamish Macdonald
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License.  See the file README.legal in the main directory of this archive
13 * for more details.
14 */
15
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/tty.h>
20#include <linux/clocksource.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
29#include <asm/bootinfo.h>
30#include <asm/bootinfo-vme.h>
31#include <asm/byteorder.h>
32#include <asm/setup.h>
33#include <asm/irq.h>
34#include <asm/traps.h>
35#include <asm/machdep.h>
36#include <asm/mvme147hw.h>
37
38
39static void mvme147_get_model(char *model);
40extern void mvme147_sched_init(irq_handler_t handler);
41extern int mvme147_hwclk (int, struct rtc_time *);
42extern void mvme147_reset (void);
43
44
45static int bcd2int (unsigned char b);
46
47
48int __init mvme147_parse_bootinfo(const struct bi_record *bi)
49{
50	uint16_t tag = be16_to_cpu(bi->tag);
51	if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
52		return 0;
53	else
54		return 1;
55}
56
57void mvme147_reset(void)
58{
59	pr_info("\r\n\nCalled mvme147_reset\r\n");
60	m147_pcc->watchdog = 0x0a;	/* Clear timer */
61	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
62	while (1)
63		;
64}
65
66static void mvme147_get_model(char *model)
67{
68	sprintf(model, "Motorola MVME147");
69}
70
71/*
72 * This function is called during kernel startup to initialize
73 * the mvme147 IRQ handling routines.
74 */
75
76void __init mvme147_init_IRQ(void)
77{
78	m68k_setup_user_interrupt(VEC_USER, 192);
79}
80
81void __init config_mvme147(void)
82{
83	mach_max_dma_address	= 0x01000000;
84	mach_sched_init		= mvme147_sched_init;
85	mach_init_IRQ		= mvme147_init_IRQ;
86	mach_hwclk		= mvme147_hwclk;
87	mach_reset		= mvme147_reset;
88	mach_get_model		= mvme147_get_model;
89
90	/* Board type is only set by newer versions of vmelilo/tftplilo */
91	if (!vme_brdtype)
92		vme_brdtype = VME_TYPE_MVME147;
93}
94
95static u64 mvme147_read_clk(struct clocksource *cs);
96
97static struct clocksource mvme147_clk = {
98	.name   = "pcc",
99	.rating = 250,
100	.read   = mvme147_read_clk,
101	.mask   = CLOCKSOURCE_MASK(32),
102	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
103};
104
105static u32 clk_total;
106
107#define PCC_TIMER_CLOCK_FREQ 160000
108#define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
109#define PCC_TIMER_PRELOAD    (0x10000 - PCC_TIMER_CYCLES)
110
111/* Using pcc tick timer 1 */
112
113static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
114{
115	irq_handler_t timer_routine = dev_id;
116	unsigned long flags;
117
118	local_irq_save(flags);
119	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
120			     PCC_TIMER_TIC_EN;
121	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
122				 PCC_LEVEL_TIMER1;
123	clk_total += PCC_TIMER_CYCLES;
124	timer_routine(0, NULL);
125	local_irq_restore(flags);
126
127	return IRQ_HANDLED;
128}
129
130
131void mvme147_sched_init (irq_handler_t timer_routine)
132{
133	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
134			"timer 1", timer_routine))
135		pr_err("Couldn't register timer interrupt\n");
136
137	/* Init the clock with a value */
138	/* The clock counter increments until 0xFFFF then reloads */
139	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
140	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
141			     PCC_TIMER_TIC_EN;
142	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
143				 PCC_LEVEL_TIMER1;
144
145	clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
146}
147
148static u64 mvme147_read_clk(struct clocksource *cs)
149{
150	unsigned long flags;
151	u8 overflow, tmp;
152	u16 count;
153	u32 ticks;
154
155	local_irq_save(flags);
156	tmp = m147_pcc->t1_cntrl >> 4;
157	count = m147_pcc->t1_count;
158	overflow = m147_pcc->t1_cntrl >> 4;
159	if (overflow != tmp)
160		count = m147_pcc->t1_count;
161	count -= PCC_TIMER_PRELOAD;
162	ticks = count + overflow * PCC_TIMER_CYCLES;
163	ticks += clk_total;
164	local_irq_restore(flags);
165
166	return ticks;
167}
168
169static int bcd2int (unsigned char b)
170{
171	return ((b>>4)*10 + (b&15));
172}
173
174int mvme147_hwclk(int op, struct rtc_time *t)
175{
176#warning check me!
177	if (!op) {
178		m147_rtc->ctrl = RTC_READ;
179		t->tm_year = bcd2int (m147_rtc->bcd_year);
180		t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
181		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
182		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
183		t->tm_min  = bcd2int (m147_rtc->bcd_min);
184		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
185		m147_rtc->ctrl = 0;
186		if (t->tm_year < 70)
187			t->tm_year += 100;
188	}
189	return 0;
190}
191