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1 | /* | |
2 | * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de> | |
3 | * | |
4 | * SPDX-License-Identifier: GPL-2.0 | |
5 | */ | |
6 | ||
7 | ||
8 | #include "common.h" | |
9 | #include <avr/interrupt.h> | |
10 | #include <avr/wdt.h> | |
11 | #include <stdlib.h> | |
12 | ||
13 | #include "config.h" | |
14 | #include "ff.h" | |
15 | #include "z80-if.h" | |
16 | #include "i2c.h" | |
17 | #include "con-utils.h" | |
18 | #include "serial.h" | |
19 | #include "timer.h" | |
20 | #include "cli.h" | |
21 | #include "env.h" | |
22 | #include "z180-serv.h" | |
23 | #include "gpio.h" | |
24 | #include "time.h" | |
25 | #include "rtc.h" | |
26 | #include "debug.h" | |
27 | #include "cmd_fat.h" | |
28 | ||
29 | ||
30 | uint8_t mcusr __attribute__ ((section (".noinit"))); | |
31 | ||
32 | #if DEBUG | |
33 | __attribute__ ((naked)) __attribute__ ((section (".init3"))) | |
34 | void preset_ram (void) | |
35 | { | |
36 | for (uint8_t *p = (uint8_t *) RAMSTART; p <= (uint8_t *) RAMEND; p++) | |
37 | *p = 0xdd; | |
38 | ||
39 | } | |
40 | #endif | |
41 | ||
42 | __attribute__ ((naked)) __attribute__ ((section (".init3"))) | |
43 | void get_mcusr (void) | |
44 | { | |
45 | /* save and clear reset reason(s) */ | |
46 | /* TODO: move to init section? */ | |
47 | mcusr = MCUSR; | |
48 | MCUSR = 0; | |
49 | ||
50 | wdt_disable(); | |
51 | } | |
52 | ||
53 | /*--------------------------------------------------------------------------*/ | |
54 | #if DEBUG | |
55 | ||
56 | static const FLASH char * const FLASH rreasons[] = { | |
57 | FSTR("Power on"), | |
58 | FSTR("External"), | |
59 | FSTR("Brown out"), | |
60 | FSTR("Watchdog"), | |
61 | FSTR("JTAG"), | |
62 | }; | |
63 | ||
64 | static | |
65 | void print_reset_reason(void) | |
66 | { | |
67 | uint8_t r = mcusr & 0x1f; | |
68 | const FLASH char * const FLASH *p = rreasons; | |
69 | ||
70 | my_puts_P(PSTR("### Reset reason(s): ")); | |
71 | if (r == 0) | |
72 | my_puts_P(PSTR("none")); | |
73 | for ( ; r; p++, r >>= 1) { | |
74 | if (r & 1) { | |
75 | my_puts_P(*p); | |
76 | if (r & ~1) | |
77 | my_puts_P(PSTR(", ")); | |
78 | } | |
79 | } | |
80 | my_puts_P(PSTR(".\n")); | |
81 | } | |
82 | ||
83 | #endif | |
84 | ||
85 | ISR(INT5_vect) | |
86 | { | |
87 | Stat |= S_MSG_PENDING; | |
88 | } | |
89 | ||
90 | ISR(INT6_vect) | |
91 | { | |
92 | Stat |= S_CON_PENDING; | |
93 | } | |
94 | ||
95 | static | |
96 | void setup_avr(void) | |
97 | { | |
98 | /* CPU */ | |
99 | ||
100 | /* Disable JTAG Interface regardless of the JTAGEN fuse setting. */ | |
101 | MCUCR = _BV(JTD); | |
102 | MCUCR = _BV(JTD); | |
103 | ||
104 | /* Disable peripherals. Enable individually in respective init function. */ | |
105 | PRR0 = _BV(PRTWI) | | |
106 | _BV(PRTIM2) | _BV(PRTIM0) | _BV(PRTIM1) | | |
107 | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC); | |
108 | ||
109 | PRR1 = _BV(PRTIM5) | _BV(PRTIM4) | _BV(PRTIM3) | | |
110 | _BV(PRUSART3) | _BV(PRUSART2) | _BV(PRUSART1); | |
111 | ||
112 | ||
113 | /* Disable analog comparator */ | |
114 | ACSR = _BV(ACD); | |
115 | /* Ports */ | |
116 | ||
117 | /* Clock */ | |
118 | CLKPR = _BV(CLKPCE); | |
119 | CLKPR = 0; | |
120 | ||
121 | /* System timer */ | |
122 | setup_timer(); | |
123 | ||
124 | /* INT5, INT6: falling edge */ | |
125 | EICRB = (EICRB & ~((0b11 << ISC50) | (0b11 << ISC60))) | | |
126 | (0b10 << ISC50) | (0b10 << ISC60); | |
127 | /* Reset pending ints */ | |
128 | EIFR |= _BV(INTF5) | _BV(INTF6); | |
129 | /* Enable INT5, and INT6 */ | |
130 | EIMSK |= _BV(INT5) | _BV(INT6); | |
131 | } | |
132 | ||
133 | static | |
134 | int reset_reason_is_power_on(void) | |
135 | { | |
136 | return (mcusr & _BV(PORF)) != 0; | |
137 | } | |
138 | ||
139 | static | |
140 | void setup_system_time(void) | |
141 | { | |
142 | struct tm rtc_time; | |
143 | ||
144 | rtc_get(&rtc_time); | |
145 | rtc_time.tm_isdst = 0; | |
146 | set_system_time(mk_gmtime(&rtc_time) ); | |
147 | } | |
148 | ||
149 | ||
150 | /*--------------------------------------------------------------------------*/ | |
151 | ||
152 | /* Stored value of bootdelay, used by autoboot_command() */ | |
153 | static int stored_bootdelay; | |
154 | ||
155 | ||
156 | /*************************************************************************** | |
157 | * Watch for 'delay' seconds for autoboot stop. | |
158 | * returns: 0 - no key, allow autoboot | |
159 | * 1 - got key, abort | |
160 | */ | |
161 | ||
162 | static int abortboot(int bootdelay) | |
163 | { | |
164 | int abort = 0; | |
165 | uint32_t ts; | |
166 | ||
167 | if (bootdelay >= 0) | |
168 | printf_P(PSTR("Hit any key to stop autoboot: %2d "), bootdelay); | |
169 | ||
170 | #if defined CONFIG_ZERO_BOOTDELAY_CHECK | |
171 | /* | |
172 | * Check if key already pressed | |
173 | * Don't check if bootdelay < 0 | |
174 | */ | |
175 | if (bootdelay >= 0) { | |
176 | if (tstc()) { /* we got a key press */ | |
177 | (void) my_getchar(1); /* consume input */ | |
178 | my_puts_P(PSTR("\b\b\b 0")); | |
179 | abort = 1; /* don't auto boot */ | |
180 | } | |
181 | } | |
182 | #endif | |
183 | ||
184 | while ((bootdelay > 0) && (!abort)) { | |
185 | --bootdelay; | |
186 | /* delay 1000 ms */ | |
187 | ts = get_timer(0); | |
188 | do { | |
189 | if (tstc()) { /* we got a key press */ | |
190 | abort = 1; /* don't auto boot */ | |
191 | bootdelay = 0; /* no more delay */ | |
192 | break; | |
193 | } | |
194 | udelay(10000); | |
195 | } while (!abort && get_timer(ts) < 1000); | |
196 | ||
197 | printf_P(PSTR("\b\b\b%2d "), bootdelay); | |
198 | } | |
199 | ||
200 | putchar('\n'); | |
201 | ||
202 | return abort; | |
203 | } | |
204 | ||
205 | static | |
206 | const char *bootdelay_process(void) | |
207 | { | |
208 | char *s; | |
209 | int bootdelay; | |
210 | ||
211 | bootdelay = (int) getenv_ulong(PSTR(ENV_BOOTDELAY), 10, CONFIG_BOOTDELAY); | |
212 | ||
213 | ||
214 | debug("### main_loop entered: bootdelay=%d\n\n", bootdelay); | |
215 | _delay_ms(20); | |
216 | ||
217 | s = getenv_str(PSTR(ENV_BOOTCMD)); | |
218 | stored_bootdelay = bootdelay; | |
219 | return s; | |
220 | } | |
221 | ||
222 | static | |
223 | void autoboot_command(const char *s) | |
224 | { | |
225 | debug("### main_loop: bootcmd=\"%s\"\n", s ? s : ""); | |
226 | _delay_ms(20); | |
227 | ||
228 | if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) { | |
229 | run_command_list(s, -1); | |
230 | } | |
231 | } | |
232 | ||
233 | ||
234 | static | |
235 | void main_loop(void) | |
236 | { | |
237 | const char *s; | |
238 | ||
239 | s = bootdelay_process(); | |
240 | autoboot_command(s); | |
241 | cli_loop(); | |
242 | } | |
243 | ||
244 | int main(void) | |
245 | { | |
246 | extern void setup_mmc(void); | |
247 | ||
248 | __malloc_margin = CONFIG_SYS_MALLOC_MARGIN; | |
249 | setup_avr(); | |
250 | for (int i = 0; i < GPIO_MAX; i++) | |
251 | gpio_config(i, INPUT_PULLUP); | |
252 | setup_mmc(); | |
253 | env_init(); | |
254 | z80_setup_bus(); | |
255 | ||
256 | if (reset_reason_is_power_on()) | |
257 | _delay_ms(CONFIG_PWRON_DELAY); | |
258 | ||
259 | serial_setup(getenv_ulong(PSTR(ENV_BAUDRATE), 10, CONFIG_BAUDRATE)); | |
260 | sei(); | |
261 | ||
262 | #if DEBUG | |
263 | debug("\n=========================< (RE)START DEBUG >=========================\n"); | |
264 | print_reset_reason(); | |
265 | #endif | |
266 | ||
267 | i2c_init(CONFIG_SYS_I2C_CLOCK); | |
268 | setup_system_time(); | |
269 | setup_fatfs(); | |
270 | ||
271 | printf_P(PSTR("\n" stringify(DEVICE_NAME) "+Z8S180 Stamp Monitor - Version: " VERSION " \n\n")); | |
272 | ||
273 | setup_z180_serv(); | |
274 | ||
275 | main_loop(); | |
276 | } |