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/* floppy.c - floppy disk driver */
#include <system.h>
#include <floppy.h>
#include <dma.h>
#include <timer.h>
unsigned char floppy_flags = 0;
unsigned char floppy_num_drives = 0;
unsigned char floppy_drive_type;
unsigned char floppy_state = FLOPPY_STATE_IDLE;
unsigned char floppy_waiting = 0;
unsigned char floppy_requests = 0;
unsigned char ST0, ST1, ST2, ST3;
struct floppy_request request;
static inline void send_floppy_byte(unsigned char byte) {
unsigned char status;
do IN_PORT_PP(PORT_FLOPPY_STATUS, status); while((status & 0xC0) != 0x80);
OUT_PORT(byte, PORT_FLOPPY_COMMAND_DATA);
}
static inline unsigned char recv_floppy_byte() {
unsigned char status;
do IN_PORT_PP(PORT_FLOPPY_STATUS, status); while((status & 0xD0) != 0xD0);
IN_PORT_PP(PORT_FLOPPY_COMMAND_DATA, status);
return status;
}
static inline void recalibrate(unsigned char drive) {
floppy_state = FLOPPY_STATE_RECALIBRATE;
floppy_waiting = 1;
send_floppy_byte(0x07);
send_floppy_byte(drive);
}
void test() {
read_floppy_sectors(0, 0, 0, 1, 1);
}
void init_floppy() {
unsigned short info;
unsigned char i;
//Kill motor
OUT_PORT(0x0C, PORT_FLOPPY_DOR);
//List drives
asm(
"mov $0x28,%%ax\n"
"mov %%ax,%%fs\n"
"mov %%fs:0x0410,%0"
: "=a" (info)
);
if(info & 1) {
floppy_num_drives = ((info >> 6) & 3) + 1;
if(floppy_num_drives > 2) floppy_num_drives = 2;
if(floppy_num_drives == 1) print("1 floppy drive found\r\n");
else print("2 floppy drives found\r\n");
}
else {
print(" No floppy drives found...\r\n");
return;
}
OUT_PORT(0x10, 0x70);
IN_PORT(0x71, floppy_drive_type);
if((floppy_drive_type >> 4) & 0x0F) {
print(" fd0: ");
if(((floppy_drive_type >> 4) & 0x0F) > 5) print("unknown");
else print(floppy_drive_types[(floppy_drive_type >> 4) & 0x0F]);
print("\r\n");
}
if(floppy_drive_type & 0x0F) {
print(" fd1: ");
if((floppy_drive_type & 0x0F) > 5) print("unknown");
else print(floppy_drive_types[floppy_drive_type & 0x0F]);
print("\r\n");
}
// configure
/*OUT_PORT(0x13, PORT_FLOPPY_COMMAND_DATA);
OUT_PORT(0, PORT_FLOPPY_COMMAND_DATA);
OUT_PORT(0x1F, PORT_FLOPPY_COMMAND_DATA);
OUT_PORT(0, PORT_FLOPPY_COMMAND_DATA);
// specify
OUT_PORT(0x03, PORT_FLOPPY_COMMAND_DATA);
OUT_PORT(0xCF, PORT_FLOPPY_COMMAND_DATA);
OUT_PORT(0x06, PORT_FLOPPY_COMMAND_DATA);*/
}
int read_floppy_sectors(unsigned char drive, unsigned char cylinder, unsigned char head, unsigned char sector, unsigned char sector_count) {
unsigned char i;
// test parameters
if(drive != 0 && drive != 1) return 1;
else if((drive == 0) && (((floppy_drive_type >> 4) & 0x0F) != 4)) return 2;
else if((drive == 1) && ((floppy_drive_type & 0x0F) != 4)) return 2;
if(!sector_count) return 3;
if(floppy_state == FLOPPY_STATE_IDLE) {
//Activate drive motor
OUT_PORT((1 << (4 + drive)) | 0x0C, PORT_FLOPPY_DOR);
print("TEST\n");
sleep(5000);
print("TEST\n");
//Recalibrate
//recalibrate(drive);
}
return 0;
}
void floppy_proc() {
unsigned char i;
/*IN_PORT(PORT_FLOPPY_STATUS, i);
print_hex_byte(i);*/
//dma_clear_ff();
//IN_PORT(0x04, i);
//print_hex_byte(i);
//IN_PORT(0x04, i);
//print_hex_byte(i);
/*IN_PORT(0x81, i);
print_hex_byte(i);*/
//IN_PORT(0x05, i);
//print_hex_byte(i);
/*IN_PORT(0x05, i);
print_hex_byte(i);*/
if(floppy_waiting) return;
if(floppy_state == FLOPPY_STATE_RECALIBRATE) {
floppy_state = FLOPPY_STATE_READ;
floppy_waiting = 1;
dma_disable(2);
dma_clear_ff();
dma_set_mode(2, DMA_MODE_SINGLE | DMA_MODE_READ | DMA_MODE_INC_ADDR);
dma_set_base_addr(2, (void*)0x200000);
dma_set_word_count(2, 0xFFFF);
dma_enable(2);
send_floppy_byte(0xE6);
send_floppy_byte(0x00);
send_floppy_byte(0x00);
send_floppy_byte(0x00);
send_floppy_byte(0x02);
send_floppy_byte(0x02);
send_floppy_byte(0x01);
send_floppy_byte(0x1B);
send_floppy_byte(0xFF);
}
}
void floppy_IRQ() {
//floppy_waiting = 0;
switch(floppy_state) {
case FLOPPY_STATE_RECALIBRATE:
print("Recalibrate FDC interrupt\n");
//IN_PORT(PORT_FLOPPY_STATUS, i);
//print_hex_byte(i);
//floppy_state = FLOPPY_STATE_READ;
//floppy_waiting = 0;
send_floppy_byte(0x08);
//print_hex_byte(recv_floppy_byte());
//print_hex_byte(recv_floppy_byte());
ST0 = recv_floppy_byte();
ST1 = recv_floppy_byte();
/*dma_disable(2);
dma_clear_ff();
dma_set_mode(2, DMA_MODE_SINGLE | DMA_MODE_READ | DMA_MODE_INC_ADDR);
dma_set_base_addr(2, (void*)0x100000);
dma_set_word_count(2, 512);
dma_enable(2);
send_floppy_byte(0xE6);
send_floppy_byte(0x00);
send_floppy_byte(0x00);
send_floppy_byte(0x00);
send_floppy_byte(0x01);
send_floppy_byte(0x02);
send_floppy_byte(0x01);
send_floppy_byte(0x1B);
send_floppy_byte(0xFF);*/
break;
case FLOPPY_STATE_READ:
print("Read FDC interrupt\n");
floppy_state = FLOPPY_STATE_IDLE;
print_hex_long(*(unsigned long*)0x1FFB00);
break;
default:
print("Unexpected FDC interrupt!\n");
}
}
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