366 lines
9.2 KiB
C
366 lines
9.2 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include <bsp.h>
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typedef rt_uint8_t u8;
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typedef rt_uint16_t u16;
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typedef rt_uint32_t u32;
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typedef rt_int8_t s8;
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typedef rt_int16_t s16;
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typedef rt_int32_t s32;
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#define OUTB(v,p) outb(p,v)
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#include "floppy.h"
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#include "dma.h"
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#define SECTOR_SIZE 512
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#define panic(str,...) do { rt_kprintf("panic::" str,##__VA_ARGS__); while(1); } while(0)
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#define _local_irq_save(level) level = rt_hw_interrupt_disable()
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#define _local_irq_restore(level) rt_hw_interrupt_enable(level)
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static u8 floppy_buffer[512]; /* 软盘高速缓冲区地址指针 */
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#define MAX_REPLIES 7
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static u8 floppy_reply_buffer[MAX_REPLIES]; /* 软驱回应缓冲区 */
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#define ST0 (floppy_reply_buffer[0]) /* 软驱回应0号字节 */
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#define ST1 (floppy_reply_buffer[1]) /* 软驱回应1号字节 */
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#define ST2 (floppy_reply_buffer[2]) /* 软驱回应2号字节 */
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#define ST3 (floppy_reply_buffer[3]) /* 软驱回应3号字节 */
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static char *floppy_inc_name; /* 软驱型号名 */
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static char *floppy_type;
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static u32 floppy_motor=0; /* 软驱马达状态字节 */
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static u32 floppy_size =0;
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/**********************功能函数***************************/
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static void floppy_result(void); /* 获得软驱响应状态 */
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static u32 floppy_sendbyte(u32); /* 向软驱控制寄存器发送一个控制字节 */
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static u32 floppy_getbyte(void); /* 从软驱数据寄存器得到一个数据字节 */
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static u32 floppy_get_info(void); /* 得到软驱信息 */
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static void floppy_motorOn(void); /* 打开软驱马达 */
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static void floppy_motorOff(void); /* 关闭软驱马达 */
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static void floppy_setmode(void); /* 软驱模式设置 */
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static void block_to_hts(u32, u32*, u32*, u32*); /* 逻辑块转为磁盘头、磁道号和扇区号 */
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static void floppy_setupDMA(void); /* 设置软驱DMA通道 */
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static void floppy_read_cmd(u32 blk); /* 从软盘上读取指定的逻辑块到缓冲区 */
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void floppy_result(void)
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{
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u8 stat, i,count;
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i=0;
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for(count=0; count<0xFF; count++)
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{
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stat = inb( FD_STATUS ) & (STATUS_READY|STATUS_DIR|STATUS_BUSY); //读取状态寄存器
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if (stat == STATUS_READY)
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return;
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if (stat == (STATUS_READY|STATUS_DIR|STATUS_BUSY))
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{
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if(i>7) break;
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floppy_reply_buffer[i++]=inb_p(FD_DATA);
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}
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}
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panic("Get floppy status times out !\n");
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}
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u32 floppy_sendbyte( u32 value )
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{
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u8 stat, i;
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for ( i = 0; i < 128; i++ ) {
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stat = inb( FD_STATUS ) & (STATUS_READY|STATUS_DIR); //读取状态寄存器
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if ( stat == STATUS_READY )
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{
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OUTB( value ,FD_DATA); //将参数写入数据寄存器
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return 1;
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}
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io_delay(); // 作一些延迟
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}
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return 0;
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}
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u32 floppy_getbyte(void)
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{
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u8 stat, i;
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for ( i = 0; i < 128; i++ ) {
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stat = inb( FD_STATUS ) & (STATUS_READY|STATUS_DIR|STATUS_BUSY); //读取状态寄存器
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if (stat == STATUS_READY)
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return -1;
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if ( stat == 0xD0 )
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return inb(FD_DATA);
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io_delay();
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}
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return 0;
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}
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u32 floppy_get_info(void)
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{
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u32 i;
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u8 CmType, FdType;
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floppy_sendbyte(0x10);
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i = floppy_getbyte();
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switch (i)
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{
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case 0x80: floppy_inc_name = "NEC765A controller"; break;
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case 0x90: floppy_inc_name = "NEC765B controller"; break;
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default: floppy_inc_name = "Enhanced controller"; break;
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}
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CmType = readcmos(0x10); //read floppy type from cmos
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FdType = (CmType>>4) & 0x07;
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if ( FdType == 0 )
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panic("Floppy driver not found!");
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switch( FdType )
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{
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case 0x02: // 1.2MB
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floppy_type = "1.2MB";
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floppy_size = 2458*512;
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break;
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case 0x04: // 1.44MB 标准软盘
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floppy_type = "1.44MB";
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floppy_size = 2880*512;
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break;
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case 0x05: // 2.88MB
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floppy_type = "2.88MB";
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floppy_size = 2*2880*512;
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break;
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}
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return 1;
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}
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void floppy_motorOn( void )
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{
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u32 eflags;
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if (!floppy_motor)
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{
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_local_irq_save(eflags);
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OUTB(28,FD_DOR);
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floppy_motor = 1;
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_local_irq_restore(eflags);
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}
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return;
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}
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void floppy_motorOff( void )
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{
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u32 eflags;
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if (floppy_motor)
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{
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_local_irq_save(eflags);
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OUTB(12,FD_DOR);
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floppy_motor = 0;
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_local_irq_restore(eflags);
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}
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return;
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}
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void floppy_setmode(void)
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{
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floppy_sendbyte (FD_SPECIFY);
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floppy_sendbyte (0xcf);
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floppy_sendbyte (0x06);
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OUTB (0,FD_DCR);
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}
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void block_to_hts(u32 block, u32 *head, u32 *track, u32 *sector )
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{
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*head = ( block % ( 18 * 2 ) ) /18;
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*track = block / ( 18 * 2 );
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*sector = block % 18 + 1;
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}
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void floppy_setupDMA(void)
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{
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u32 eflags;
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_local_irq_save(eflags);
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DisableDma(2);
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ClearDmaFF(2);
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SetDmaMode(2,DMA_MODE_READ);
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SetDmaAddr(2,(unsigned long)floppy_buffer);
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SetDmaCount(2,512);
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EnableDma(2);
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_local_irq_restore(eflags);
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}
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void floppy_read_cmd(u32 blk)
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{
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u32 head;
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u32 track;
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u32 sector;
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block_to_hts(blk,&head,&track,§or);
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floppy_motorOn();
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io_delay();
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floppy_setupDMA();
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io_delay();
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floppy_setmode();
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io_delay();
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floppy_sendbyte (FD_READ); //send read command
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floppy_sendbyte (head*4 + 0);
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floppy_sendbyte (track); /* Cylinder */
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floppy_sendbyte (head); /* Head */
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floppy_sendbyte (sector); /* Sector */
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floppy_sendbyte (2); /* 0=128, 1=256, 2=512, 3=1024, ... */
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floppy_sendbyte (18);
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//floppy_sendbyte (sector+secs-1); /* Last sector in track:here are sectors count */
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floppy_sendbyte (0x1B);
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floppy_sendbyte (0xff);
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return;
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}
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static struct rt_device devF;
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static struct rt_mutex lock;
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static struct rt_semaphore sem;
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/* RT-Thread device interface */
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static rt_err_t rt_floppy_init_internal(rt_device_t dev)
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{
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return RT_EOK;
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}
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static rt_err_t rt_floppy_open(rt_device_t dev, rt_uint16_t oflag)
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{
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return RT_EOK;
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}
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static rt_err_t rt_floppy_close(rt_device_t dev)
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{
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return RT_EOK;
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}
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/* position: block page address, not bytes address
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* buffer:
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* size : how many blocks
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*/
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static rt_size_t rt_floppy_read(rt_device_t device, rt_off_t position, void *buffer, rt_size_t size)
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{
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rt_size_t doSize = size;
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rt_mutex_take(&lock, RT_WAITING_FOREVER);
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while(size>0)
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{
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floppy_read_cmd(position);
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rt_sem_take(&sem, RT_WAITING_FOREVER); /* waiting isr sem forever */
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floppy_result();
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io_delay();
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if(ST1 != 0 || ST2 != 0)
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{
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panic("ST0 %d ST1 %d ST2 %d\n",ST0,ST1,ST2);
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}
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rt_memcpy(buffer, floppy_buffer, 512);
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floppy_motorOff();
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io_delay();
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position += 1;
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size -= 1;
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}
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rt_mutex_release(&lock);
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return doSize;
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}
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/* position: block page address, not bytes address
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* buffer:
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* size : how many blocks
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*/
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static rt_size_t rt_floppy_write(rt_device_t device, rt_off_t position, const void *buffer, rt_size_t size)
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{
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rt_mutex_take(&lock, RT_WAITING_FOREVER);
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panic("FIXME:I don't know how!\n");
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rt_mutex_release(&lock);
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return size;
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}
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static rt_err_t rt_floppy_control(rt_device_t dev, int cmd, void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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if (cmd == RT_DEVICE_CTRL_BLK_GETGEOME)
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{
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struct rt_device_blk_geometry *geometry;
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geometry = (struct rt_device_blk_geometry *)args;
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if (geometry == RT_NULL) return -RT_ERROR;
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geometry->bytes_per_sector = SECTOR_SIZE;
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geometry->block_size = SECTOR_SIZE;
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geometry->sector_count = floppy_size / SECTOR_SIZE;
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}
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return RT_EOK;
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}
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static void rt_floppy_isr(int vector, void* param)
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{
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(void)vector;
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(void)param;
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rt_sem_release(&sem);
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}
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void rt_floppy_init(void)
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{
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struct rt_device *device;
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rt_mutex_init(&lock,"fdlock", RT_IPC_FLAG_FIFO);
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rt_sem_init(&sem, "fdsem", 0, RT_IPC_FLAG_FIFO);
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rt_hw_interrupt_install(FLOPPY_IRQ, rt_floppy_isr, RT_NULL, "floppy");
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rt_hw_interrupt_umask(FLOPPY_IRQ);
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floppy_get_info();
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rt_kprintf("Floppy Inc : %s Floppy Type : %s\n",floppy_inc_name,floppy_type);
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device = &(devF);
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device->type = RT_Device_Class_Block;
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device->init = rt_floppy_init_internal;
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device->open = rt_floppy_open;
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device->close = rt_floppy_close;
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device->read = rt_floppy_read;
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device->write = rt_floppy_write;
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device->control = rt_floppy_control;
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device->user_data = NULL;
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rt_device_register(device, "floppy",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
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}
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