[z180-stamp.git] / avr / z180-serv.c

/*
 * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include "common.h"
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <util/atomic.h>

#include "background.h"
#include "env.h"
#include "ff.h"
#include "serial.h"
#include "z80-if.h"
#include "debug.h"
#include "print-utils.h"
#include "z180-serv.h"
#include "timer.h"
#include "time.h"
#include "bcd.h"
#include "rtc.h"

#define DEBUG_CPM_SDIO	0	/* set to 1 to debug */

#define debug_cpmsd(fmt, args...)		                                            \
	debug_cond(DEBUG_CPM_SDIO, fmt, ##args)


/*--------------------------------------------------------------------------*/


uint8_t z80_get_byte(uint32_t adr)
{
	uint8_t data;

	z80_bus_cmd(Request);
	data = z80_read(adr);
	z80_bus_cmd(Release);

	return data;
}


/*--------------------------------------------------------------------------*/

struct msg_item {
	uint8_t fct;
	uint8_t sub_min, sub_max;
	void (*func)(uint8_t, int, uint8_t *);
};

uint32_t msg_to_addr(uint8_t *msg)
{
	union {
		uint32_t as32;
		uint8_t as8[4];
	} addr;

	addr.as8[0] = msg[0];
	addr.as8[1] = msg[1];
	addr.as8[2] = msg[2];
	addr.as8[3] = 0;

	return addr.as32;
}


static int msg_xmit_header(uint8_t func, uint8_t subf, int len)
{
	z80_memfifo_putc(fifo_msgout, 0xAE);
	z80_memfifo_putc(fifo_msgout, len+2);
	z80_memfifo_putc(fifo_msgout, func);
	z80_memfifo_putc(fifo_msgout, subf);

	return 0;
}

int msg_xmit(uint8_t func, uint8_t subf, int len, uint8_t *msg)
{
	msg_xmit_header(func, subf, len);
	while (len--)
		z80_memfifo_putc(fifo_msgout, *msg++);

	return 0;
}

void do_msg_ini_memfifo(uint8_t subf, int len, uint8_t * msg)
{
	(void)len;

	z80_memfifo_init(subf, msg_to_addr(msg));
}


void do_msg_char_out(uint8_t subf, int len, uint8_t * msg)
{
	(void)subf;

	while (len--)
		putchar(*msg++);
}

/* echo message */
void do_msg_echo(uint8_t subf, int len, uint8_t * msg)
{
	(void)subf;

	/* send re-echo */
	msg_xmit(1, 3, len, msg);
}

/* get timer */
void do_msg_get_timer(uint8_t subf, int len, uint8_t * msg)
{
	uint32_t time_ms = (len >= 4) ? *(uint32_t *) msg : 0;

	time_ms = get_timer(time_ms);
	msg_xmit(3, subf, sizeof(time_ms), (uint8_t *) &time_ms);
}

/* ---------------------------------------------------------------------------*/

#define CPM_DAY_OFFSET ((1978-1900) * 365 + 19)		/* 19 leap years */

/*
 * Convert CP/M time stamp to a broken-down time structure
 *
 */
int mk_date_time (int len, uint8_t *msg, struct tm *tmp)
{
	time_t stamp;

	if (len != 5)
		return -1;

	/* days since 2000-01-01 */
	long days = msg[3] + (msg[4] << 8) - 8036;

	if (days < 0)
		return -1;

	stamp = days * ONE_DAY;
	stamp += bcd2bin(msg[0]);
	stamp += bcd2bin(msg[1]) * 60 ;
	stamp += bcd2bin(msg[2]) * 3600L;
	gmtime_r(&stamp, tmp);
	return 0;
}

void mk_cpm_time(struct tm *tmp, uint8_t cpm_time[5])
{
	uint16_t days = 1;
	uint_fast8_t leap=2;

	for (int year=78; year < tmp->tm_year; year++) {
		days = days + 365 + (leap == 0);
		leap = (leap+1)%4;
	}
	days += tmp->tm_yday;

	cpm_time[0] = bin2bcd(tmp->tm_sec);
	cpm_time[1] = bin2bcd(tmp->tm_min);
	cpm_time[2] = bin2bcd(tmp->tm_hour);
	cpm_time[3] = days;
	cpm_time[4] = days >> 8;
}

/* get/set cp/m time */
void do_msg_get_set_time(uint8_t subf, int len, uint8_t * msg)
{
	struct tm t;
	uint8_t cpm_time[5];
	int rc;

	memset(cpm_time, 0, ARRAY_SIZE(cpm_time));

	switch (subf) {
	case 3:			/* set date & time */
		/* initialize t with current time */
		rc = rtc_get (&t);

		if (rc == 0) {
			/* insert new date & time */
			if (mk_date_time (len, msg, &t) != 0) {
				my_puts_P(PSTR("## set_time: Bad date format\n"));
				break;
			}

			time_t time;
			time = mk_gmtime(&t);
			gmtime_r(&time, &t);

			/* and write to RTC */
			rc = rtc_set (&t);
			if(rc)
				my_puts_P(PSTR("## set_time: Set date failed\n"));
		} else {
			my_puts_P(PSTR("## set_time: Get date failed\n"));
		}
		/* FALL TROUGH */
	case 2:			/* get date & time */
		rc = rtc_get (&t);

		if (rc) {
			my_puts_P(PSTR("## get_time: Get date failed\n"));
			break;
		}

		time_t time;
		time = mk_gmtime(&t);
		//mktime(&t);
		gmtime_r(&time, &t);


		mk_cpm_time(&t, cpm_time);
		break;
	}

	msg_xmit(3, subf, sizeof(cpm_time), cpm_time);
}

/* ---------------------------------------------------------------------------*/

#define MAX_DRIVE	4
#define BLOCK_SIZE	512
#define TPA_BASE	0x10000
#define COMMON_BASE	0xC000

struct cpm_drive_s {
	uint8_t drv;
	uint8_t device;
	char *img_name;
	bool dirty;
	FIL fd;
};

static uint8_t disk_buffer[BLOCK_SIZE];
static struct cpm_drive_s drv_table[MAX_DRIVE];
static int handle_cpm_drv_to;

#define f_dirty(fp) ((fp)->fs->wflag != 0)


int cpm_drv_to(int state)
{
	static uint32_t ts;

	switch(state) {
	case 0:
		break;

	case 1:
		ts = get_timer(0);
		state = 2;
		break;

	case 2:
		if (get_timer(ts) > 1000) {
			for (uint_fast8_t i=0; i < MAX_DRIVE; i++) {
//				if (&drv_table[i].fd && f_dirty(&drv_table[i].fd)) {
				if (drv_table[i].dirty) {
					f_sync(&drv_table[i].fd);
					drv_table[i].dirty = false;
					debug_cpmsd("## %7lu f_sync: %c:\n", get_timer(0), i+'A');
				}
			}
			state = 0;
		}
	}
	return state;
}


void msg_cpm_result(uint8_t subf, uint8_t rc, int res)
{
	uint8_t result_msg[3];

	if (res)
		rc |= 0x80;

	result_msg[0] = rc;
	result_msg[1] = res;
	result_msg[2] = res >> 8;

	if (rc) {
		debug_cpmsd("###%7lu  error rc: %.02x, res: %d\n", get_timer(0), rc, res);
	}

	msg_xmit(2, subf, sizeof(result_msg), result_msg);
}

/*
 	db	2	; disk command
	ds	1	; subcommand (login/read/write)
	ds	1	; @adrv (8 bits)	+0
	ds	1	; @rdrv (8 bits)	+1
	ds	3	; @xdph (24 bits)	+2
*/

void do_msg_cpm_login(uint8_t subf, int len, uint8_t * msg)
{

	FRESULT res = 0;
	uint8_t drv;
	char *np;

	(void)subf;

	if (len != 5) {     /* TODO: check adrv, rdrv */
		return msg_cpm_result(subf, 0x01, res);
	}

	debug_cpmsd("\n## %7lu  login: %c:\n", get_timer(0), msg[0]+'A');


	drv = msg[0];
	if ( drv>= MAX_DRIVE) {
		return msg_cpm_result(subf, 0x02, res);
	}

/*
	uint32_t dph = ((uint32_t)msg[4] << 16) + ((uint16_t)msg[3] << 8) + msg[2];
*/

	if (drv_table[drv].img_name != NULL) {
		debug_cpmsd("## %7lu  close: '%s'\n", get_timer(0), drv_table[drv].img_name);
		f_close(&drv_table[drv].fd);
		drv_table[drv].dirty = false;
		free(drv_table[drv].img_name);
		drv_table[drv].img_name = NULL;
	}

	strcpy_P((char *)disk_buffer, PSTR("dsk0"));
	disk_buffer[3] = msg[0] + '0';
	if (((np = getenv((char*)disk_buffer)) == NULL) ||
			((drv_table[drv].img_name = strdup(np)) == NULL)) {
		return msg_cpm_result(subf, 0x03, res);
	}


	res = f_open(&drv_table[drv].fd, drv_table[drv].img_name,
			FA_WRITE | FA_READ);

    debug_cpmsd("## %7lu   open: '%s', (env: '%s'), res: %d\n", get_timer(0),
			drv_table[drv].img_name, disk_buffer, res);

	/* send  result*/
	msg_cpm_result(subf, 0x00, res);
}


/*
 	db	2	; disk command
	ds	1	; subcommand (login/read/write)
	ds	1	; @adrv (8 bits)		+0
	ds	1	; @rdrv (8 bits)		+1
	ds	2	; @trk (16 bits)		+2
	ds	2	; @sect(16 bits)		+4
	ds	1	; @cnt  (8 bits)		+6
	ds	3	; phys. transfer addr	+7
*/

#define ADRV	0
#define RDRV	1
#define TRK		2
#define SEC		4
#define CNT		6
#define ADDR	7

void do_msg_cpm_rw(uint8_t subf, int len, uint8_t * msg)
{
	uint8_t drv;
	uint32_t addr;
	uint32_t pos;
	uint8_t secs;
	bool dowrite = (subf == 2);
	FRESULT res = 0;
	uint8_t rc = 0;
	bool buserr = 0;

	if (len != 10) {     /* TODO: check adrv, rdrv */
		return msg_cpm_result(subf, 0x01, res);
	}

	drv = msg[ADRV];
	if ( drv>= MAX_DRIVE) {
		return msg_cpm_result(subf, 0x02, res);
	}

	secs = msg[CNT];
	addr = ((uint32_t)msg[ADDR+2] << 16) + ((uint16_t)msg[ADDR+1] << 8) + msg[ADDR];


	/* TODO: tracks per sector from dpb */
	pos = (((uint16_t)(msg[TRK+1] << 8) + msg[TRK]) * 8
			+ ((uint32_t)(msg[SEC+1] << 8) + msg[SEC])) * BLOCK_SIZE;

	debug_cpmsd("## %7lu cpm_rw: %s %c: trk:%4d, sec: %d, pos: %.8lx, secs: %2d, "
			"addr: %.5lx\n", get_timer(0), dowrite ? "write" : " read",
			msg[ADRV]+'A', ((uint16_t)(msg[TRK+1] << 8) + msg[TRK]), msg[SEC],
			pos, msg[CNT], addr);

	res = f_lseek(&drv_table[drv].fd, pos);
	while (!res && secs--) {
		unsigned int cnt, br;

		/* check bank boundary crossing */
		cnt = 0;
		if (addr < (TPA_BASE + COMMON_BASE) &&
					(addr + BLOCK_SIZE) > (TPA_BASE + COMMON_BASE)) {
			cnt = (TPA_BASE + COMMON_BASE) - addr;
		}

		if (cnt) {
			debug_cpmsd("## %67c addr: %.5lx, cnt: %3d\n", ' ', addr, cnt);
			debug_cpmsd("## %67c addr: %.5lx, cnt: %3d\n", ' ', addr+cnt-TPA_BASE, BLOCK_SIZE-cnt);
		}

		if (dowrite) {
			if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
				buserr = 1;
				break;
			} else {
				if (cnt) {
					z80_read_block(disk_buffer, addr, cnt);
					addr = addr + cnt - TPA_BASE;
				}
				z80_read_block(disk_buffer+cnt, addr, BLOCK_SIZE - cnt);
				z80_bus_cmd(Release);
			}
			res = f_write(&drv_table[drv].fd, disk_buffer, BLOCK_SIZE, &br);
		} else {
			res = f_read(&drv_table[drv].fd, disk_buffer, BLOCK_SIZE, &br);
			if (res == FR_OK && br == BLOCK_SIZE) {
				if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
					buserr = 1;
					break;
				} else {
					if (cnt) {
						z80_write_block(disk_buffer, addr, cnt);
						addr = addr + cnt - TPA_BASE;
					}
					z80_write_block(disk_buffer+cnt, addr, BLOCK_SIZE - cnt);
					z80_bus_cmd(Release);
				}
			}
		}

		if (br != BLOCK_SIZE) {
			debug_cpmsd("## %7lu f_read res: %d, bytes rd/wr: %u\n", get_timer(0), res, br);
			dump_ram(disk_buffer, 0, 64, "Read Data");
			res = -1;
		}

		addr += BLOCK_SIZE;
	}

	if (dowrite && !res) {
//		res = f_sync(&drv_table[drv].fd);
		drv_table[drv].dirty = true;
		bg_setstat(handle_cpm_drv_to, 1);
	}


	if (buserr) {
		debug_cpmsd("Bus timeout\n");
		rc = 0x03;
	}

	/* send  result*/
	msg_cpm_result(subf, rc, res);
}


const FLASH struct msg_item z80_messages[] =
{
	{ 0,			/* fct nr. */
	  1, 3,			/* sub fct nr. from, to */
	  do_msg_ini_memfifo},
	{ 1,
	  1, 1,
	  do_msg_char_out},
	{ 1,
	  2, 2,
	  do_msg_echo},
	{ 2,
	  0, 0,
	  do_msg_cpm_login},
	{ 2,
	  1, 2,
	  do_msg_cpm_rw},
	{ 3,
	  1, 1,
	  do_msg_get_timer},
	{ 3,
	  2, 3,				/* 2: get, 3: set time and date */
	  do_msg_get_set_time},
	{ 0xff,				/* end mark */
	  0, 0,
	  0},

};


void do_message(int len, uint8_t *msg)
{
	uint8_t fct, sub_fct;
	int_fast8_t i = 0;

	if (len >= 2) {
		fct = *msg++;
		sub_fct = *msg++;
		len -= 2;

		while (fct != z80_messages[i].fct) {
			if (z80_messages[i].fct == 0xff) {
				DBG_P(1, "do_message: Unknown function: %i, %i\n",
						fct, sub_fct);
				return; /* TODO: unknown message # */
			}

			++i;
		}

		while (fct == z80_messages[i].fct) {
			if (sub_fct >= z80_messages[i].sub_min &&
					sub_fct <= z80_messages[i].sub_max )
				break;
			++i;
		}

		if (z80_messages[i].fct != fct) {
			DBG_P(1, "do_message: Unknown sub function: %i, %i\n",
					fct, sub_fct);
			return; /* TODO: unknown message sub# */
		}

		(z80_messages[i].func)(sub_fct, len, msg);


	} else {
		/* TODO: error */
		DBG_P(1, "do_message: to few arguments (%i); this shouldn't happen!\n", len);
	}
}


#define CTRBUF_LEN 256

void check_msg_fifo(void)
{
	int ch;
	static int_fast8_t state;
	static int msglen,idx;
	static uint8_t buffer[CTRBUF_LEN];

	while ((ch = z80_memfifo_getc(fifo_msgin)) >= 0) {
		switch (state) {
		case 0:		/* wait for start of message */
			if (ch == 0xAE)	{ /* TODO: magic number */
				msglen = 0;
				idx = 0;
				state = 1;
			}
			break;
		case 1:		/* get msg len */
			if (ch > 0 && ch <= CTRBUF_LEN) {
				msglen = ch;
				state = 2;
			} else
				state = 0;
			break;
		case 2: 	/* get message */
			buffer[idx++] = ch;
			if (idx == msglen) {
				do_message(msglen, buffer);
				state = 0;
			}
			break;
		}
	}
}


int msg_handling(int state)
{
	uint8_t pending;

	ATOMIC_BLOCK(ATOMIC_FORCEON) {
		pending = (Stat & S_MSG_PENDING) != 0;
		Stat &= ~S_MSG_PENDING;
	}
/*
 * TODO: if pending but no message chr --> special condition. ie init,...
 */

	if (pending) {
		switch (state) {
		case 0:			/* need init */
			/* Get address of fifo_list */
			z80_bus_cmd(Request);
			uint32_t fifo_list = z80_read(0x40) +
				((uint16_t) z80_read(0x41) << 8) +
				((uint32_t) z80_read(0x42) << 16);
			z80_bus_cmd(Release);
			if (fifo_list != 0) {
				/* Get address of fifo 0 */
				z80_bus_cmd(Request);
				uint32_t fifo_addr = z80_read(fifo_list) +
					((uint16_t) z80_read(fifo_list+1) << 8) +
					((uint32_t) z80_read(fifo_list+2) << 16);
				z80_bus_cmd(Release);
				if (fifo_addr != 0) {
					z80_memfifo_init(fifo_msgin, fifo_addr);
					state = 1;
				}
			}
			break;
		case 1:			/* awaiting messages */
			check_msg_fifo();
			break;
		}
	}

	return state;
}


static int handle_msg_handling;

void setup_z180_serv(void)
{

	handle_msg_handling = bg_register(msg_handling, 0);
	handle_cpm_drv_to = bg_register(cpm_drv_to, 0);
}

void restart_z180_serv(void)
{
	z80_bus_cmd(Request);
	z80_write(0x40, 0);
	z80_write(0x41, 0);
	z80_write(0x42, 0);
	z80_bus_cmd(Release);

	for (int i = 0; i < NUM_FIFOS; i++)
		z80_memfifo_init(i, 0);
	bg_setstat(handle_msg_handling, 0);

}

#if 0
/*--------------------------------------------------------------------------*/

const FLASH uint8_t iniprog[] = {
	0xAF,			// xor     a
	0xED, 0x39, 0x36,	// out0    (rcr),a         ;disable  DRAM refresh
	0x3E, 0x30,		// ld      a,030h
	0xED, 0x39, 0x32	//out0    (dcntl),a       ;0 mem, max i/0 wait states
};

const FLASH uint8_t sertest[] = {
	0xAF,              //  	xor	a
	0xED, 0x39, 0x36,  //  	out0	(rcr),a		;disable  DRAM refresh
	0x3E, 0x30,        //  	ld	a,030h
	0xED, 0x39, 0x32,  //  	out0	(dcntl),a	;0 mem, max i/0 wait states
	0x3E, 0x80,        //  	ld	a,M_MPBT		;no MP, PS=10, DR=16, SS=0
	0xED, 0x39, 0x03,  //  	out0	(cntlb1),a
	0x3E, 0x64,        //  	ld	a,M_RE + M_TE + M_MOD2	;
	0xED, 0x39, 0x01,  //  	out0	(cntla1),a
	0x3E, 0x00,        //  	ld	a,0
	0xED, 0x39, 0x05,  //  	out0	(stat1),a	;Enable rx interrupts
	0xED, 0x38, 0x05,  //l0:in0	a,(stat1)
	0xE6, 0x80,        //  	and	80h
	0x28, 0xF9,        //  	jr	z,l0
	0xED, 0x00, 0x09,  //  	in0	b,(rdr1)
	0xED, 0x38, 0x05,  //l1:in0	a,(stat1)
	0xE6, 0x02,        //  	and	02h
	0x28, 0xF9,        //  	jr	z,l1
	0xED, 0x01, 0x07,  //  	out0	(tdr1),b
	0x18, 0xEA,        //  	jr	l0
};

const FLASH uint8_t test1[] = {
	0xAF,              //	xor	a
	0xED, 0x39, 0x36,  //	out0	(rcr),a		;disable  DRAM refresh
	0x3E, 0x30,        //	ld	a,030h
	0xED, 0x39, 0x32,  //	out0	(dcntl),a	;0 mem, max i/0 wait states
	0x21, 0x1E, 0x00,  // 	ld	hl,dmclrt	;load DMA registers
	0x06, 0x08,        //	ld	b,dmct_e-dmclrt
	0x0E, 0x20,        //	ld	c,sar0l
	0xED, 0x93,        //	otimr
	0x3E, 0xC3,        //	ld	a,0c3h		;dst +1, src +1, burst
	0xED, 0x39, 0x31,  //	out0	(dmode),a	;
	0x3E, 0x62,        //	ld	a,062h		;enable dma0,
	0xED, 0x39, 0x30,  //cl_1:	out0	(dstat),a	;copy 64k
	0x18, 0xFB,        //	jr	cl_1		;
	0x00, 0x00,        //dmclrt:	dw	0		;src (inc)
	0x00,              //	db 	0		;src
	0x00, 0x00,        //	dw	0		;dst (inc),
	0x00,              //	db	0		;dst
	0x00, 0x00,        //	dw 	0		;count (64k)
};
#endif
Commit	Line	Data
35edb766 L	1	/*
	2	* (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
72f58822	7	#include "common.h"
5f7f3586 L	8	#include <stdlib.h>
	9	#include <string.h>
	10	#include <stdbool.h>
89adce76	11	#include <util/atomic.h>
72f58822	12
89adce76	13	#include "background.h"
5f7f3586 L	14	#include "env.h"
5f7f3586 L	15	#include "ff.h"
72f58822 L	16	#include "serial.h"
72f58822 L	17	#include "z80-if.h"
889202c4	18	#include "debug.h"
5f7f3586	19	#include "print-utils.h"
89adce76	20	#include "z180-serv.h"
daacc6f9	21	#include "timer.h"
845cbdbd L	22	#include "time.h"
	23	#include "bcd.h"
	24	#include "rtc.h"
7d60b20b L	25
	26	#define DEBUG_CPM_SDIO 0 /* set to 1 to debug */
	27
	28	#define debug_cpmsd(fmt, args...) \
	29	debug_cond(DEBUG_CPM_SDIO, fmt, ##args)
	30
	31
	32
72f58822 L	33	/--------------------------------------------------------------------------/
72f58822 L	34
72f58822 L	35
	36	uint8_t z80_get_byte(uint32_t adr)
	37	{
	38	uint8_t data;
8a7decea	39
62f624d3	40	z80_bus_cmd(Request);
89adce76	41	data = z80_read(adr);
62f624d3	42	z80_bus_cmd(Release);
8a7decea	43
72f58822 L	44	return data;
	45	}
	46
	47
	48	/--------------------------------------------------------------------------/
	49
	50	struct msg_item {
	51	uint8_t fct;
	52	uint8_t sub_min, sub_max;
	53	void (func)(uint8_t, int, uint8_t );
	54	};
	55
	56	uint32_t msg_to_addr(uint8_t *msg)
	57	{
	58	union {
	59	uint32_t as32;
	60	uint8_t as8[4];
	61	} addr;
	62
	63	addr.as8[0] = msg[0];
	64	addr.as8[1] = msg[1];
	65	addr.as8[2] = msg[2];
	66	addr.as8[3] = 0;
	67
	68	return addr.as32;
	69	}
	70
72f58822	71
1a2460dc L	72	static int msg_xmit_header(uint8_t func, uint8_t subf, int len)
	73	{
	74	z80_memfifo_putc(fifo_msgout, 0xAE);
	75	z80_memfifo_putc(fifo_msgout, len+2);
	76	z80_memfifo_putc(fifo_msgout, func);
	77	z80_memfifo_putc(fifo_msgout, subf);
	78
	79	return 0;
	80	}
	81
	82	int msg_xmit(uint8_t func, uint8_t subf, int len, uint8_t *msg)
	83	{
	84	msg_xmit_header(func, subf, len);
	85	while (len--)
	86	z80_memfifo_putc(fifo_msgout, *msg++);
	87
	88	return 0;
	89	}
	90
72f58822 L	91	void do_msg_ini_memfifo(uint8_t subf, int len, uint8_t * msg)
	92	{
	93	(void)len;
	94
89adce76	95	z80_memfifo_init(subf, msg_to_addr(msg));
72f58822 L	96	}
	97
	98
	99	void do_msg_char_out(uint8_t subf, int len, uint8_t * msg)
	100	{
	101	(void)subf;
	102
	103	while (len--)
	104	putchar(*msg++);
	105	}
	106
1a2460dc L	107	/* echo message */
	108	void do_msg_echo(uint8_t subf, int len, uint8_t * msg)
	109	{
	110	(void)subf;
	111
	112	/* send re-echo */
	113	msg_xmit(1, 3, len, msg);
	114	}
	115
8590a76b L	116	/* get timer */
	117	void do_msg_get_timer(uint8_t subf, int len, uint8_t * msg)
	118	{
a8eb521f	119	uint32_t time_ms = (len >= 4) ? (uint32_t ) msg : 0;
8590a76b	120
a8eb521f	121	time_ms = get_timer(time_ms);
8590a76b L	122	msg_xmit(3, subf, sizeof(time_ms), (uint8_t *) &time_ms);
	123	}
	124
5f7f3586 L	125	/* ---------------------------------------------------------------------------*/
5f7f3586 L	126
845cbdbd L	127	#define CPM_DAY_OFFSET ((1978-1900) * 365 + 19) /* 19 leap years */
	128
	129	/*
	130	* Convert CP/M time stamp to a broken-down time structure
	131	*
	132	*/
	133	int mk_date_time (int len, uint8_t msg, struct tm tmp)
	134	{
	135	time_t stamp;
	136
	137	if (len != 5)
	138	return -1;
	139
	140	/* days since 2000-01-01 */
	141	long days = msg[3] + (msg[4] << 8) - 8036;
	142
	143	if (days < 0)
	144	return -1;
	145
	146	stamp = days * ONE_DAY;
	147	stamp += bcd2bin(msg[0]);
	148	stamp += bcd2bin(msg[1]) * 60 ;
8d0fad4c	149	stamp += bcd2bin(msg[2]) * 3600L;
845cbdbd L	150	gmtime_r(&stamp, tmp);
	151	return 0;
	152	}
	153
	154	void mk_cpm_time(struct tm *tmp, uint8_t cpm_time[5])
	155	{
	156	uint16_t days = 1;
	157	uint_fast8_t leap=2;
	158
	159	for (int year=78; year < tmp->tm_year; year++) {
	160	days = days + 365 + (leap == 0);
	161	leap = (leap+1)%4;
	162	}
	163	days += tmp->tm_yday;
	164
	165	cpm_time[0] = bin2bcd(tmp->tm_sec);
	166	cpm_time[1] = bin2bcd(tmp->tm_min);
	167	cpm_time[2] = bin2bcd(tmp->tm_hour);
	168	cpm_time[3] = days;
	169	cpm_time[4] = days >> 8;
845cbdbd L	170	}
	171
	172	/* get/set cp/m time */
	173	void do_msg_get_set_time(uint8_t subf, int len, uint8_t * msg)
	174	{
	175	struct tm t;
	176	uint8_t cpm_time[5];
	177	int rc;
	178
	179	memset(cpm_time, 0, ARRAY_SIZE(cpm_time));
	180
	181	switch (subf) {
	182	case 3: /* set date & time */
	183	/* initialize t with current time */
	184	rc = rtc_get (&t);
	185
	186	if (rc == 0) {
	187	/* insert new date & time */
	188	if (mk_date_time (len, msg, &t) != 0) {
	189	my_puts_P(PSTR("## set_time: Bad date format\n"));
	190	break;
	191	}
	192
	193	time_t time;
	194	time = mk_gmtime(&t);
	195	gmtime_r(&time, &t);
	196
	197	/* and write to RTC */
	198	rc = rtc_set (&t);
	199	if(rc)
	200	my_puts_P(PSTR("## set_time: Set date failed\n"));
	201	} else {
	202	my_puts_P(PSTR("## set_time: Get date failed\n"));
	203	}
	204	/* FALL TROUGH */
	205	case 2: /* get date & time */
	206	rc = rtc_get (&t);
	207
	208	if (rc) {
	209	my_puts_P(PSTR("## get_time: Get date failed\n"));
	210	break;
	211	}
	212
	213	time_t time;
	214	time = mk_gmtime(&t);
	215	//mktime(&t);
	216	gmtime_r(&time, &t);
	217
	218
	219	mk_cpm_time(&t, cpm_time);
	220	break;
	221	}
	222
	223	msg_xmit(3, subf, sizeof(cpm_time), cpm_time);
	224	}
	225
	226	/* ---------------------------------------------------------------------------*/
	227
01484095	228	#define MAX_DRIVE 4
5f7f3586	229	#define BLOCK_SIZE 512
daacc6f9 L	230	#define TPA_BASE 0x10000
daacc6f9 L	231	#define COMMON_BASE 0xC000
5f7f3586 L	232
	233	struct cpm_drive_s {
	234	uint8_t drv;
	235	uint8_t device;
	236	char *img_name;
393b1897	237	bool dirty;
5f7f3586 L	238	FIL fd;
	239	};
	240
	241	static uint8_t disk_buffer[BLOCK_SIZE];
5f7f3586	242	static struct cpm_drive_s drv_table[MAX_DRIVE];
393b1897 L	243	static int handle_cpm_drv_to;
	244
	245	#define f_dirty(fp) ((fp)->fs->wflag != 0)
	246
	247
	248	int cpm_drv_to(int state)
	249	{
	250	static uint32_t ts;
	251
	252	switch(state) {
	253	case 0:
	254	break;
	255
	256	case 1:
	257	ts = get_timer(0);
	258	state = 2;
	259	break;
	260
	261	case 2:
	262	if (get_timer(ts) > 1000) {
	263	for (uint_fast8_t i=0; i < MAX_DRIVE; i++) {
	264	// if (&drv_table[i].fd && f_dirty(&drv_table[i].fd)) {
	265	if (drv_table[i].dirty) {
	266	f_sync(&drv_table[i].fd);
	267	drv_table[i].dirty = false;
	268	debug_cpmsd("## %7lu f_sync: %c:\n", get_timer(0), i+'A');
	269	}
	270	}
	271	state = 0;
	272	}
	273	}
	274	return state;
	275	}
	276
	277
	278	void msg_cpm_result(uint8_t subf, uint8_t rc, int res)
	279	{
	280	uint8_t result_msg[3];
	281
	282	if (res)
	283	rc \|= 0x80;
	284
	285	result_msg[0] = rc;
	286	result_msg[1] = res;
	287	result_msg[2] = res >> 8;
	288
	289	if (rc) {
	290	debug_cpmsd("###%7lu error rc: %.02x, res: %d\n", get_timer(0), rc, res);
	291	}
	292
	293	msg_xmit(2, subf, sizeof(result_msg), result_msg);
	294	}
5f7f3586 L	295
	296	/*
	297	db 2 ; disk command
	298	ds 1 ; subcommand (login/read/write)
	299	ds 1 ; @adrv (8 bits) +0
	300	ds 1 ; @rdrv (8 bits) +1
	301	ds 3 ; @xdph (24 bits) +2
	302	*/
	303
	304	void do_msg_cpm_login(uint8_t subf, int len, uint8_t * msg)
	305	{
	306
	307	FRESULT res = 0;
5f7f3586 L	308	uint8_t drv;
5f7f3586 L	309	char *np;
5f7f3586 L	310
	311	(void)subf;
	312
	313	if (len != 5) { /* TODO: check adrv, rdrv */
393b1897	314	return msg_cpm_result(subf, 0x01, res);
5f7f3586 L	315	}
5f7f3586 L	316
7d60b20b	317	debug_cpmsd("\n## %7lu login: %c:\n", get_timer(0), msg[0]+'A');
5f7f3586 L	318
	319
	320	drv = msg[0];
	321	if ( drv>= MAX_DRIVE) {
393b1897	322	return msg_cpm_result(subf, 0x02, res);
5f7f3586 L	323	}
5f7f3586 L	324
5f7f3586 L	325	/*
	326	uint32_t dph = ((uint32_t)msg[4] << 16) + ((uint16_t)msg[3] << 8) + msg[2];
	327	*/
	328
	329	if (drv_table[drv].img_name != NULL) {
7d60b20b	330	debug_cpmsd("## %7lu close: '%s'\n", get_timer(0), drv_table[drv].img_name);
5f7f3586	331	f_close(&drv_table[drv].fd);
393b1897	332	drv_table[drv].dirty = false;
5f7f3586 L	333	free(drv_table[drv].img_name);
	334	drv_table[drv].img_name = NULL;
	335	}
	336
	337	strcpy_P((char *)disk_buffer, PSTR("dsk0"));
	338	disk_buffer[3] = msg[0] + '0';
	339	if (((np = getenv((char*)disk_buffer)) == NULL) \|\|
	340	((drv_table[drv].img_name = strdup(np)) == NULL)) {
393b1897	341	return msg_cpm_result(subf, 0x03, res);
5f7f3586 L	342	}
	343
	344
	345	res = f_open(&drv_table[drv].fd, drv_table[drv].img_name,
	346	FA_WRITE \| FA_READ);
	347
7d60b20b	348	debug_cpmsd("## %7lu open: '%s', (env: '%s'), res: %d\n", get_timer(0),
5f7f3586 L	349	drv_table[drv].img_name, disk_buffer, res);
5f7f3586 L	350
5f7f3586	351	/* send result*/
393b1897	352	msg_cpm_result(subf, 0x00, res);
5f7f3586 L	353	}
	354
	355
	356	/*
	357	db 2 ; disk command
	358	ds 1 ; subcommand (login/read/write)
daacc6f9 L	359	ds 1 ; @adrv (8 bits) +0
	360	ds 1 ; @rdrv (8 bits) +1
	361	ds 2 ; @trk (16 bits) +2
	362	ds 2 ; @sect(16 bits) +4
	363	ds 1 ; @cnt (8 bits) +6
5f7f3586 L	364	ds 3 ; phys. transfer addr +7
	365	*/
	366
daacc6f9 L	367	#define ADRV 0
	368	#define RDRV 1
	369	#define TRK 2
	370	#define SEC 4
	371	#define CNT 6
	372	#define ADDR 7
	373
5f7f3586 L	374	void do_msg_cpm_rw(uint8_t subf, int len, uint8_t * msg)
	375	{
	376	uint8_t drv;
	377	uint32_t addr;
	378	uint32_t pos;
7d60b20b	379	uint8_t secs;
5f7f3586 L	380	bool dowrite = (subf == 2);
	381	FRESULT res = 0;
	382	uint8_t rc = 0;
	383	bool buserr = 0;
5f7f3586 L	384
5f7f3586 L	385	if (len != 10) { /* TODO: check adrv, rdrv */
393b1897	386	return msg_cpm_result(subf, 0x01, res);
5f7f3586 L	387	}
5f7f3586 L	388
daacc6f9	389	drv = msg[ADRV];
5f7f3586	390	if ( drv>= MAX_DRIVE) {
393b1897	391	return msg_cpm_result(subf, 0x02, res);
5f7f3586 L	392	}
5f7f3586 L	393
7d60b20b	394	secs = msg[CNT];
daacc6f9	395	addr = ((uint32_t)msg[ADDR+2] << 16) + ((uint16_t)msg[ADDR+1] << 8) + msg[ADDR];
5f7f3586	396
5f7f3586	397
daacc6f9 L	398	/* TODO: tracks per sector from dpb */
	399	pos = (((uint16_t)(msg[TRK+1] << 8) + msg[TRK]) * 8
	400	+ ((uint32_t)(msg[SEC+1] << 8) + msg[SEC])) * BLOCK_SIZE;
5f7f3586	401
7d60b20b L	402	debug_cpmsd("## %7lu cpm_rw: %s %c: trk:%4d, sec: %d, pos: %.8lx, secs: %2d, "
	403	"addr: %.5lx\n", get_timer(0), dowrite ? "write" : " read",
	404	msg[ADRV]+'A', ((uint16_t)(msg[TRK+1] << 8) + msg[TRK]), msg[SEC],
	405	pos, msg[CNT], addr);
5f7f3586 L	406
5f7f3586 L	407	res = f_lseek(&drv_table[drv].fd, pos);
7d60b20b	408	while (!res && secs--) {
daacc6f9 L	409	unsigned int cnt, br;
daacc6f9 L	410
7d60b20b L	411	/* check bank boundary crossing */
7d60b20b L	412	cnt = 0;
daacc6f9	413	if (addr < (TPA_BASE + COMMON_BASE) &&
7d60b20b	414	(addr + BLOCK_SIZE) > (TPA_BASE + COMMON_BASE)) {
daacc6f9	415	cnt = (TPA_BASE + COMMON_BASE) - addr;
daacc6f9 L	416	}
daacc6f9 L	417
7d60b20b L	418	if (cnt) {
	419	debug_cpmsd("## %67c addr: %.5lx, cnt: %3d\n", ' ', addr, cnt);
	420	debug_cpmsd("## %67c addr: %.5lx, cnt: %3d\n", ' ', addr+cnt-TPA_BASE, BLOCK_SIZE-cnt);
	421	}
5f7f3586 L	422
	423	if (dowrite) {
	424	if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
	425	buserr = 1;
7d60b20b	426	break;
5f7f3586	427	} else {
7d60b20b L	428	if (cnt) {
	429	z80_read_block(disk_buffer, addr, cnt);
	430	addr = addr + cnt - TPA_BASE;
	431	}
	432	z80_read_block(disk_buffer+cnt, addr, BLOCK_SIZE - cnt);
5f7f3586	433	z80_bus_cmd(Release);
5f7f3586	434	}
7d60b20b	435	res = f_write(&drv_table[drv].fd, disk_buffer, BLOCK_SIZE, &br);
5f7f3586	436	} else {
7d60b20b L	437	res = f_read(&drv_table[drv].fd, disk_buffer, BLOCK_SIZE, &br);
7d60b20b L	438	if (res == FR_OK && br == BLOCK_SIZE) {
5f7f3586 L	439	if (!(z80_bus_cmd(Request) & ZST_ACQUIRED)) {
5f7f3586 L	440	buserr = 1;
7d60b20b	441	break;
5f7f3586	442	} else {
7d60b20b L	443	if (cnt) {
	444	z80_write_block(disk_buffer, addr, cnt);
	445	addr = addr + cnt - TPA_BASE;
	446	}
	447	z80_write_block(disk_buffer+cnt, addr, BLOCK_SIZE - cnt);
5f7f3586 L	448	z80_bus_cmd(Release);
	449	}
	450	}
	451	}
	452
7d60b20b L	453	if (br != BLOCK_SIZE) {
7d60b20b L	454	debug_cpmsd("## %7lu f_read res: %d, bytes rd/wr: %u\n", get_timer(0), res, br);
5f7f3586 L	455	dump_ram(disk_buffer, 0, 64, "Read Data");
	456	res = -1;
	457	}
daacc6f9	458
7d60b20b	459	addr += BLOCK_SIZE;
5f7f3586 L	460	}
5f7f3586 L	461
393b1897 L	462	if (dowrite && !res) {
	463	// res = f_sync(&drv_table[drv].fd);
	464	drv_table[drv].dirty = true;
	465	bg_setstat(handle_cpm_drv_to, 1);
	466	}
	467
daacc6f9	468
5f7f3586	469	if (buserr) {
7d60b20b	470	debug_cpmsd("Bus timeout\n");
5f7f3586 L	471	rc = 0x03;
5f7f3586 L	472	}
5f7f3586 L	473
5f7f3586 L	474	/* send result*/
393b1897	475	msg_cpm_result(subf, rc, res);
5f7f3586 L	476	}
5f7f3586 L	477
72f58822 L	478
	479	const FLASH struct msg_item z80_messages[] =
	480	{
	481	{ 0, /* fct nr. */
89adce76	482	1, 3, /* sub fct nr. from, to */
72f58822 L	483	do_msg_ini_memfifo},
	484	{ 1,
	485	1, 1,
	486	do_msg_char_out},
1a2460dc L	487	{ 1,
	488	2, 2,
	489	do_msg_echo},
5f7f3586 L	490	{ 2,
	491	0, 0,
	492	do_msg_cpm_login},
	493	{ 2,
	494	1, 2,
	495	do_msg_cpm_rw},
8590a76b L	496	{ 3,
	497	1, 1,
	498	do_msg_get_timer},
845cbdbd L	499	{ 3,
	500	2, 3, /* 2: get, 3: set time and date */
	501	do_msg_get_set_time},
72f58822 L	502	{ 0xff, /* end mark */
	503	0, 0,
	504	0},
	505
	506	};
	507
	508
	509
	510
	511	void do_message(int len, uint8_t *msg)
	512	{
	513	uint8_t fct, sub_fct;
	514	int_fast8_t i = 0;
	515
	516	if (len >= 2) {
	517	fct = *msg++;
	518	sub_fct = *msg++;
	519	len -= 2;
	520
89adce76 L	521	while (fct != z80_messages[i].fct) {
	522	if (z80_messages[i].fct == 0xff) {
	523	DBG_P(1, "do_message: Unknown function: %i, %i\n",
	524	fct, sub_fct);
	525	return; /* TODO: unknown message # */
	526	}
8a7decea	527
72f58822	528	++i;
72f58822 L	529	}
	530
	531	while (fct == z80_messages[i].fct) {
8a7decea	532	if (sub_fct >= z80_messages[i].sub_min &&
89adce76	533	sub_fct <= z80_messages[i].sub_max )
72f58822 L	534	break;
	535	++i;
	536	}
	537
	538	if (z80_messages[i].fct != fct) {
	539	DBG_P(1, "do_message: Unknown sub function: %i, %i\n",
	540	fct, sub_fct);
	541	return; /* TODO: unknown message sub# */
	542	}
	543
	544	(z80_messages[i].func)(sub_fct, len, msg);
	545
	546
	547	} else {
	548	/* TODO: error */
	549	DBG_P(1, "do_message: to few arguments (%i); this shouldn't happen!\n", len);
	550	}
	551	}
	552
	553
	554
	555	#define CTRBUF_LEN 256
	556
	557	void check_msg_fifo(void)
	558	{
	559	int ch;
	560	static int_fast8_t state;
	561	static int msglen,idx;
	562	static uint8_t buffer[CTRBUF_LEN];
	563
89adce76	564	while ((ch = z80_memfifo_getc(fifo_msgin)) >= 0) {
72f58822 L	565	switch (state) {
72f58822 L	566	case 0: /* wait for start of message */
3531528e	567	if (ch == 0xAE) { /* TODO: magic number */
72f58822 L	568	msglen = 0;
	569	idx = 0;
	570	state = 1;
	571	}
	572	break;
	573	case 1: /* get msg len */
	574	if (ch > 0 && ch <= CTRBUF_LEN) {
	575	msglen = ch;
	576	state = 2;
	577	} else
	578	state = 0;
	579	break;
	580	case 2: /* get message */
	581	buffer[idx++] = ch;
89adce76 L	582	if (idx == msglen) {
	583	do_message(msglen, buffer);
	584	state = 0;
	585	}
	586	break;
	587	}
	588	}
	589	}
	590
	591
	592	int msg_handling(int state)
	593	{
	594	uint8_t pending;
8a7decea L	595
8a7decea L	596	ATOMIC_BLOCK(ATOMIC_FORCEON) {
89adce76 L	597	pending = (Stat & S_MSG_PENDING) != 0;
	598	Stat &= ~S_MSG_PENDING;
	599	}
ad9bc17c L	600	/*
	601	* TODO: if pending but no message chr --> special condition. ie init,...
	602	*/
8a7decea	603
89adce76 L	604	if (pending) {
89adce76 L	605	switch (state) {
1a2460dc	606	case 0: /* need init */
cdc4625b	607	/* Get address of fifo_list */
89adce76	608	z80_bus_cmd(Request);
cdc4625b	609	uint32_t fifo_list = z80_read(0x40) +
89adce76 L	610	((uint16_t) z80_read(0x41) << 8) +
	611	((uint32_t) z80_read(0x42) << 16);
	612	z80_bus_cmd(Release);
cdc4625b L	613	if (fifo_list != 0) {
	614	/* Get address of fifo 0 */
	615	z80_bus_cmd(Request);
	616	uint32_t fifo_addr = z80_read(fifo_list) +
	617	((uint16_t) z80_read(fifo_list+1) << 8) +
	618	((uint32_t) z80_read(fifo_list+2) << 16);
	619	z80_bus_cmd(Release);
	620	if (fifo_addr != 0) {
	621	z80_memfifo_init(fifo_msgin, fifo_addr);
	622	state = 1;
	623	}
89adce76 L	624	}
89adce76 L	625	break;
1a2460dc	626	case 1: /* awaiting messages */
89adce76	627	check_msg_fifo();
72f58822 L	628	break;
	629	}
	630	}
	631
89adce76 L	632	return state;
89adce76 L	633	}
89adce76 L	634
	635
	636	static int handle_msg_handling;
	637
	638	void setup_z180_serv(void)
	639	{
8a7decea	640
89adce76	641	handle_msg_handling = bg_register(msg_handling, 0);
393b1897	642	handle_cpm_drv_to = bg_register(cpm_drv_to, 0);
72f58822 L	643	}
72f58822 L	644
89adce76 L	645	void restart_z180_serv(void)
	646	{
	647	z80_bus_cmd(Request);
	648	z80_write(0x40, 0);
	649	z80_write(0x41, 0);
	650	z80_write(0x42, 0);
	651	z80_bus_cmd(Release);
8a7decea L	652
	653	for (int i = 0; i < NUM_FIFOS; i++)
	654	z80_memfifo_init(i, 0);
89adce76	655	bg_setstat(handle_msg_handling, 0);
5f7f3586	656
89adce76	657	}
72f58822	658
845cbdbd	659	#if 0
72f58822 L	660	/--------------------------------------------------------------------------/
72f58822 L	661
72f58822 L	662	const FLASH uint8_t iniprog[] = {
	663	0xAF, // xor a
	664	0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
	665	0x3E, 0x30, // ld a,030h
	666	0xED, 0x39, 0x32 //out0 (dcntl),a ;0 mem, max i/0 wait states
	667	};
	668
	669	const FLASH uint8_t sertest[] = {
	670	0xAF, // xor a
	671	0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
	672	0x3E, 0x30, // ld a,030h
	673	0xED, 0x39, 0x32, // out0 (dcntl),a ;0 mem, max i/0 wait states
	674	0x3E, 0x80, // ld a,M_MPBT ;no MP, PS=10, DR=16, SS=0
	675	0xED, 0x39, 0x03, // out0 (cntlb1),a
	676	0x3E, 0x64, // ld a,M_RE + M_TE + M_MOD2 ;
	677	0xED, 0x39, 0x01, // out0 (cntla1),a
	678	0x3E, 0x00, // ld a,0
	679	0xED, 0x39, 0x05, // out0 (stat1),a ;Enable rx interrupts
	680	0xED, 0x38, 0x05, //l0:in0 a,(stat1)
	681	0xE6, 0x80, // and 80h
	682	0x28, 0xF9, // jr z,l0
	683	0xED, 0x00, 0x09, // in0 b,(rdr1)
	684	0xED, 0x38, 0x05, //l1:in0 a,(stat1)
	685	0xE6, 0x02, // and 02h
	686	0x28, 0xF9, // jr z,l1
	687	0xED, 0x01, 0x07, // out0 (tdr1),b
	688	0x18, 0xEA, // jr l0
	689	};
	690
	691	const FLASH uint8_t test1[] = {
	692	0xAF, // xor a
	693	0xED, 0x39, 0x36, // out0 (rcr),a ;disable DRAM refresh
	694	0x3E, 0x30, // ld a,030h
	695	0xED, 0x39, 0x32, // out0 (dcntl),a ;0 mem, max i/0 wait states
	696	0x21, 0x1E, 0x00, // ld hl,dmclrt ;load DMA registers
	697	0x06, 0x08, // ld b,dmct_e-dmclrt
	698	0x0E, 0x20, // ld c,sar0l
8a7decea	699	0xED, 0x93, // otimr
72f58822 L	700	0x3E, 0xC3, // ld a,0c3h ;dst +1, src +1, burst
72f58822 L	701	0xED, 0x39, 0x31, // out0 (dmode),a ;
8a7decea	702	0x3E, 0x62, // ld a,062h ;enable dma0,
72f58822 L	703	0xED, 0x39, 0x30, //cl_1: out0 (dstat),a ;copy 64k
72f58822 L	704	0x18, 0xFB, // jr cl_1 ;
8a7decea	705	0x00, 0x00, //dmclrt: dw 0 ;src (inc)
72f58822 L	706	0x00, // db 0 ;src
	707	0x00, 0x00, // dw 0 ;dst (inc),
	708	0x00, // db 0 ;dst
	709	0x00, 0x00, // dw 0 ;count (64k)
	710	};
845cbdbd	711	#endif