xref: /openbmc/linux/arch/m68k/q40/config.c (revision 0d3b051a)
1 /*
2  *  arch/m68k/q40/config.c
3  *
4  *  Copyright (C) 1999 Richard Zidlicky
5  *
6  * originally based on:
7  *
8  *  linux/bvme/config.c
9  *
10  * This file is subject to the terms and conditions of the GNU General Public
11  * License.  See the file README.legal in the main directory of this archive
12  * for more details.
13  */
14 
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/tty.h>
20 #include <linux/console.h>
21 #include <linux/linkage.h>
22 #include <linux/init.h>
23 #include <linux/major.h>
24 #include <linux/serial_reg.h>
25 #include <linux/rtc.h>
26 #include <linux/vt_kern.h>
27 #include <linux/bcd.h>
28 #include <linux/platform_device.h>
29 
30 #include <asm/io.h>
31 #include <asm/bootinfo.h>
32 #include <asm/setup.h>
33 #include <asm/irq.h>
34 #include <asm/traps.h>
35 #include <asm/machdep.h>
36 #include <asm/q40_master.h>
37 
38 extern void q40_init_IRQ(void);
39 static void q40_get_model(char *model);
40 extern void q40_sched_init(void);
41 
42 static int q40_hwclk(int, struct rtc_time *);
43 static unsigned int q40_get_ss(void);
44 static int q40_get_rtc_pll(struct rtc_pll_info *pll);
45 static int q40_set_rtc_pll(struct rtc_pll_info *pll);
46 
47 extern void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/);
48 
49 static void q40_mem_console_write(struct console *co, const char *b,
50 				  unsigned int count);
51 
52 extern int ql_ticks;
53 
54 static struct console q40_console_driver = {
55 	.name	= "debug",
56 	.write	= q40_mem_console_write,
57 	.flags	= CON_PRINTBUFFER,
58 	.index	= -1,
59 };
60 
61 
62 /* early debugging function:*/
63 extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
64 static int _cpleft;
65 
66 static void q40_mem_console_write(struct console *co, const char *s,
67 				  unsigned int count)
68 {
69 	const char *p = s;
70 
71 	if (count < _cpleft) {
72 		while (count-- > 0) {
73 			*q40_mem_cptr = *p++;
74 			q40_mem_cptr += 4;
75 			_cpleft--;
76 		}
77 	}
78 }
79 
80 static int __init q40_debug_setup(char *arg)
81 {
82 	/* useful for early debugging stages - writes kernel messages into SRAM */
83 	if (MACH_IS_Q40 && !strncmp(arg, "mem", 3)) {
84 		/*pr_info("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
85 		_cpleft = 2000 - ((long)q40_mem_cptr-0xff020000) / 4;
86 		register_console(&q40_console_driver);
87 	}
88 	return 0;
89 }
90 
91 early_param("debug", q40_debug_setup);
92 
93 #if 0
94 void printq40(char *str)
95 {
96 	int l = strlen(str);
97 	char *p = q40_mem_cptr;
98 
99 	while (l-- > 0 && _cpleft-- > 0) {
100 		*p = *str++;
101 		p += 4;
102 	}
103 	q40_mem_cptr = p;
104 }
105 #endif
106 
107 static int halted;
108 
109 #ifdef CONFIG_HEARTBEAT
110 static void q40_heartbeat(int on)
111 {
112 	if (halted)
113 		return;
114 
115 	if (on)
116 		Q40_LED_ON();
117 	else
118 		Q40_LED_OFF();
119 }
120 #endif
121 
122 static void q40_reset(void)
123 {
124 	halted = 1;
125 	pr_info("*******************************************\n"
126 		"Called q40_reset : press the RESET button!!\n"
127 		"*******************************************\n");
128 	Q40_LED_ON();
129 	while (1)
130 		;
131 }
132 
133 static void q40_halt(void)
134 {
135 	halted = 1;
136 	pr_info("*******************\n"
137 		"  Called q40_halt\n"
138 		"*******************\n");
139 	Q40_LED_ON();
140 	while (1)
141 		;
142 }
143 
144 static void q40_get_model(char *model)
145 {
146 	sprintf(model, "Q40");
147 }
148 
149 static unsigned int serports[] =
150 {
151 	0x3f8,0x2f8,0x3e8,0x2e8,0
152 };
153 
154 static void __init q40_disable_irqs(void)
155 {
156 	unsigned i, j;
157 
158 	j = 0;
159 	while ((i = serports[j++]))
160 		outb(0, i + UART_IER);
161 	master_outb(0, EXT_ENABLE_REG);
162 	master_outb(0, KEY_IRQ_ENABLE_REG);
163 }
164 
165 void __init config_q40(void)
166 {
167 	mach_sched_init = q40_sched_init;
168 
169 	mach_init_IRQ = q40_init_IRQ;
170 	mach_hwclk = q40_hwclk;
171 	mach_get_ss = q40_get_ss;
172 	mach_get_rtc_pll = q40_get_rtc_pll;
173 	mach_set_rtc_pll = q40_set_rtc_pll;
174 
175 	mach_reset = q40_reset;
176 	mach_get_model = q40_get_model;
177 
178 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP)
179 	mach_beep = q40_mksound;
180 #endif
181 #ifdef CONFIG_HEARTBEAT
182 	mach_heartbeat = q40_heartbeat;
183 #endif
184 	mach_halt = q40_halt;
185 
186 	/* disable a few things that SMSQ might have left enabled */
187 	q40_disable_irqs();
188 }
189 
190 
191 int __init q40_parse_bootinfo(const struct bi_record *rec)
192 {
193 	return 1;
194 }
195 
196 /*
197  * Looks like op is non-zero for setting the clock, and zero for
198  * reading the clock.
199  *
200  *  struct hwclk_time {
201  *         unsigned        sec;       0..59
202  *         unsigned        min;       0..59
203  *         unsigned        hour;      0..23
204  *         unsigned        day;       1..31
205  *         unsigned        mon;       0..11
206  *         unsigned        year;      00...
207  *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
208  * };
209  */
210 
211 static int q40_hwclk(int op, struct rtc_time *t)
212 {
213 	if (op) {
214 		/* Write.... */
215 		Q40_RTC_CTRL |= Q40_RTC_WRITE;
216 
217 		Q40_RTC_SECS = bin2bcd(t->tm_sec);
218 		Q40_RTC_MINS = bin2bcd(t->tm_min);
219 		Q40_RTC_HOUR = bin2bcd(t->tm_hour);
220 		Q40_RTC_DATE = bin2bcd(t->tm_mday);
221 		Q40_RTC_MNTH = bin2bcd(t->tm_mon + 1);
222 		Q40_RTC_YEAR = bin2bcd(t->tm_year%100);
223 		if (t->tm_wday >= 0)
224 			Q40_RTC_DOW = bin2bcd(t->tm_wday+1);
225 
226 		Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
227 	} else {
228 		/* Read....  */
229 		Q40_RTC_CTRL |= Q40_RTC_READ;
230 
231 		t->tm_year = bcd2bin (Q40_RTC_YEAR);
232 		t->tm_mon  = bcd2bin (Q40_RTC_MNTH)-1;
233 		t->tm_mday = bcd2bin (Q40_RTC_DATE);
234 		t->tm_hour = bcd2bin (Q40_RTC_HOUR);
235 		t->tm_min  = bcd2bin (Q40_RTC_MINS);
236 		t->tm_sec  = bcd2bin (Q40_RTC_SECS);
237 
238 		Q40_RTC_CTRL &= ~(Q40_RTC_READ);
239 
240 		if (t->tm_year < 70)
241 			t->tm_year += 100;
242 		t->tm_wday = bcd2bin(Q40_RTC_DOW)-1;
243 	}
244 
245 	return 0;
246 }
247 
248 static unsigned int q40_get_ss(void)
249 {
250 	return bcd2bin(Q40_RTC_SECS);
251 }
252 
253 /* get and set PLL calibration of RTC clock */
254 #define Q40_RTC_PLL_MASK ((1<<5)-1)
255 #define Q40_RTC_PLL_SIGN (1<<5)
256 
257 static int q40_get_rtc_pll(struct rtc_pll_info *pll)
258 {
259 	int tmp = Q40_RTC_CTRL;
260 
261 	pll->pll_ctrl = 0;
262 	pll->pll_value = tmp & Q40_RTC_PLL_MASK;
263 	if (tmp & Q40_RTC_PLL_SIGN)
264 		pll->pll_value = -pll->pll_value;
265 	pll->pll_max = 31;
266 	pll->pll_min = -31;
267 	pll->pll_posmult = 512;
268 	pll->pll_negmult = 256;
269 	pll->pll_clock = 125829120;
270 
271 	return 0;
272 }
273 
274 static int q40_set_rtc_pll(struct rtc_pll_info *pll)
275 {
276 	if (!pll->pll_ctrl) {
277 		/* the docs are a bit unclear so I am doublesetting */
278 		/* RTC_WRITE here ... */
279 		int tmp = (pll->pll_value & 31) | (pll->pll_value<0 ? 32 : 0) |
280 			  Q40_RTC_WRITE;
281 		Q40_RTC_CTRL |= Q40_RTC_WRITE;
282 		Q40_RTC_CTRL = tmp;
283 		Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
284 		return 0;
285 	} else
286 		return -EINVAL;
287 }
288 
289 static __init int q40_add_kbd_device(void)
290 {
291 	struct platform_device *pdev;
292 
293 	if (!MACH_IS_Q40)
294 		return -ENODEV;
295 
296 	pdev = platform_device_register_simple("q40kbd", -1, NULL, 0);
297 	return PTR_ERR_OR_ZERO(pdev);
298 }
299 arch_initcall(q40_add_kbd_device);
300