fe8385da08
* Revert "Uploaded_2_9_2025" This reverts commit ec79bbdbc9052617461a3c1b4952290a05a51adb. * Fixing DEBUG_IO builds. * Make the IO port base a define. * Fix CPU test to properly handle 808x vs V20. * Improve timeout management logic. * Improve SD Card initialization logic. * Implement INT18h bootstrapping. * Implementing a different test for processor type. * Allow use with another fixed drive (eg: ESDI drive). * Allow swapping driver ID between the BIOS disk and XTMax. * Fix address of the ROM segment. * Fixing missing STI at the top of the handler. * Major rework of IO to use MOVSW. * More code reorg and auto-detecting second drive. * Update XTSD to use MOVSW. * Add diagnostics program. * Workaround for MS-DOS strange handling of interrupts. * Use a lookup table for the memory map. * Make the BootROM relocatable. * Some more refactor of the Teensy code.
616 lines
17 KiB
C
616 lines
17 KiB
C
/*------------------------------------------------------------------------/
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/ Foolproof MMCv3/SDv1/SDv2 (in SPI mode) control module
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/-------------------------------------------------------------------------/
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/
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/ Copyright (C) 2013, ChaN, all right reserved.
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/ Copyright (C) 2024, Ted Fried, Matthieu Bucchianeri
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/
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/ * This software is a free software and there is NO WARRANTY.
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/ * No restriction on use. You can use, modify and redistribute it for
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/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
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/ * Redistributions of source code must retain the above copyright notice.
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/
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/-------------------------------------------------------------------------/
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Features and Limitations:
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* No Media Change Detection
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Application program needs to perform f_mount() after media change.
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/-------------------------------------------------------------------------*/
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#include <conio.h>
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#include "diskio.h" /* Common include file for FatFs and disk I/O layer */
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#include "cprint.h"
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/*-------------------------------------------------------------------------*/
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/* Platform dependent macros and functions needed to be modified */
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/*-------------------------------------------------------------------------*/
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DWORD VIRT_BUFFER=0xCE000000+2048;
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WORD DATAPORT=0x280;
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WORD CONTROLPORT=0x280+1;
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#if 1
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#define TOUTCHR(x)
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#define TOUTHEX(x)
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#define TOUTWORD(x)
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#else
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#define TOUTCHR(x) toutchr(x)
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#define TOUTHEX(x) touthex(x)
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#define TOUTWORD(x) toutword(x)
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static BYTE toutchr (unsigned char ch)
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{
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_DI = _SI = 0;
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_AL = ch; _AH = 0xE; _BX = 0;
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asm INT 0x10;
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return 0;
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}
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static BYTE touthex(unsigned char c)
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{
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char d = c >> 4;
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toutchr(d > 9 ? d+('A'-10) : d+'0');
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d = c & 0x0F;
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toutchr(d > 9 ? d+('A'-10) : d+'0');
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return 0;
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}
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static BYTE toutword(WORD x)
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{
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touthex(x >> 8);
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touthex(x);
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return 0;
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}
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#endif
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static
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void dly_us (UINT n)
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{
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_CX = n;
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loopit:
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_asm {
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loop loopit
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}
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}
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#define NOSHIFT
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#ifdef NOSHIFT
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DWORD dwordlshift(DWORD d, int n)
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{
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int i;
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WORD a = ((WORD *)d)[0];
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WORD b = ((WORD *)d)[1];
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DWORD r;
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for (i=0;i<n;i++)
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{
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b <<= 1;
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b |= (a & 0x8000) ? 1 : 0;
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a <<= 1;
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}
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((WORD *)r)[0] = a;
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((WORD *)r)[1] = b;
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return r;
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}
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#define DWORDLSHIFT(d,n) dwordlshift(d,n)
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DWORD dwordrshift(DWORD d, int n)
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{
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int i;
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WORD a = ((WORD *)d)[0];
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WORD b = ((WORD *)d)[1];
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DWORD r;
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for (i=0;i<n;i++)
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{
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a >>= 1;
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a |= (b & 0x1) ? 0x8000 : 0;
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b >>= 1;
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}
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((WORD *)r)[0] = a;
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((WORD *)r)[1] = b;
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return r;
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}
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#define DWORDRSHIFT(d,n) dwordrshift(d,n)
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#else
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#define DWORDLSHIFT(d,n) ((d) << (n))
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#define DWORDRSHIFT(d,n) ((d) >> (n))
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#endif
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/*--------------------------------------------------------------------------
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Module Private Functions
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---------------------------------------------------------------------------*/
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/* MMC/SD command (SPI mode) */
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#define CMD0 (0) /* GO_IDLE_STATE */
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#define CMD1 (1) /* SEND_OP_COND */
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#define ACMD41 (0x80+41) /* SEND_OP_COND (SDC) */
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#define CMD8 (8) /* SEND_IF_COND */
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#define CMD9 (9) /* SEND_CSD */
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#define CMD10 (10) /* SEND_CID */
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#define CMD12 (12) /* STOP_TRANSMISSION */
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#define CMD13 (13) /* SEND_STATUS */
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#define ACMD13 (0x80+13) /* SD_STATUS (SDC) */
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#define CMD16 (16) /* SET_BLOCKLEN */
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#define CMD17 (17) /* READ_SINGLE_BLOCK */
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#define CMD18 (18) /* READ_MULTIPLE_BLOCK */
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#define CMD23 (23) /* SET_BLOCK_COUNT */
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#define ACMD23 (0x80+23) /* SET_WR_BLK_ERASE_COUNT (SDC) */
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#define CMD24 (24) /* WRITE_BLOCK */
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#define CMD25 (25) /* WRITE_MULTIPLE_BLOCK */
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#define CMD32 (32) /* ERASE_ER_BLK_START */
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#define CMD33 (33) /* ERASE_ER_BLK_END */
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#define CMD38 (38) /* ERASE */
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#define CMD55 (55) /* APP_CMD */
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#define CMD58 (58) /* READ_OCR */
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static
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DSTATUS Stat = STA_NOINIT; /* Disk status */
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static
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BYTE CardType; /* b0:MMC, b1:SDv1, b2:SDv2, b3:Block addressing */
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/*-----------------------------------------------------------------------*/
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/* Transmit bytes to the card (bitbanging) */
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/*-----------------------------------------------------------------------*/
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static
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void xmit_mmc (
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const BYTE DOSFAR * buff, /* Data to be sent */
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UINT bc /* Number of bytes to send */
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)
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{
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// NOTE: Callers always use buffer sizes multiple of two.
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bc >>= 1;
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_asm {
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mov cx,bc
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push ds
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push es
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les di,VIRT_BUFFER
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lds si,dword ptr buff
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cld
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rep movsw
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pop es
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pop ds
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}
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}
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/*-----------------------------------------------------------------------*/
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/* Receive bytes from the card (bitbanging) */
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/*-----------------------------------------------------------------------*/
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static
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void rcvr_mmc (
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BYTE DOSFAR *buff, /* Pointer to read buffer */
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UINT bc /* Number of bytes to receive */
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)
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{
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// NOTE: Callers always use buffer sizes multiple of two.
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bc >>= 1;
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_asm {
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mov cx,bc
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push ds
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push es
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les di,dword ptr buff
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lds si,VIRT_BUFFER
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cld
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rep movsw
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pop es
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pop ds
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}
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}
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/*-----------------------------------------------------------------------*/
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/* Wait for card ready */
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/*-----------------------------------------------------------------------*/
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static
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int wait_ready (void) /* 1:OK, 0:Timeout */
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{
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BYTE d;
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UINT tmr;
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outp(DATAPORT+7, 50);
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do { /* Wait for ready in timeout of 500ms */
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d = inp(DATAPORT);
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if (d == 0xFF) break;
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} while(!inp(DATAPORT+7));
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return d == 0xFF;
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}
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/*-----------------------------------------------------------------------*/
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/* Deselect the card and release SPI bus */
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/*-----------------------------------------------------------------------*/
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static
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void deselect (void)
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{
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outp(CONTROLPORT, 1); // CS high
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}
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/*-----------------------------------------------------------------------*/
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/* Select the card and wait for ready */
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/*-----------------------------------------------------------------------*/
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static
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int select (void) /* 1:OK, 0:Timeout */
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{
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BYTE d;
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outp(CONTROLPORT, 0); // CS low
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if (wait_ready()) return 1; /* OK */
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deselect();
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return 0; /* Failed */
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}
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/*-----------------------------------------------------------------------*/
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/* Receive a data packet from the card */
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/*-----------------------------------------------------------------------*/
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static
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int rcvr_datablock ( /* 1:OK, 0:Failed */
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BYTE DOSFAR *buff, /* Data buffer to store received data */
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UINT btr /* Byte count */
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)
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{
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BYTE d;
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UINT tmr;
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outp(DATAPORT+7, 10);
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do { /* Wait for data packet in timeout of 100ms */
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d = inp(DATAPORT);
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if (d != 0xFF) break;
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} while(!inp(DATAPORT+7));
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if (d != 0xFE) {
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return 0; /* If not valid data token, return with error */
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}
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rcvr_mmc(buff, btr); /* Receive the data block into buffer */
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(void)inp(DATAPORT); (void)inp(DATAPORT); /* Discard CRC */
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return 1; /* Return with success */
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}
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/*-----------------------------------------------------------------------*/
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/* Send a data packet to the card */
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/*-----------------------------------------------------------------------*/
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static
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int xmit_datablock ( /* 1:OK, 0:Failed */
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const BYTE DOSFAR *buff, /* 512 byte data block to be transmitted */
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BYTE token /* Data/Stop token */
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)
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{
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BYTE d;
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if (!wait_ready()) return 0;
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d = token;
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outp(DATAPORT, d); /* Xmit a token */
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if (token != 0xFD) { /* Is it data token? */
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xmit_mmc(buff, 512); /* Xmit the 512 byte data block to MMC */
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(void)inp(DATAPORT); (void)inp(DATAPORT); /* Xmit dummy CRC (0xFF,0xFF) */
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d = inp(DATAPORT);; /* Receive data response */
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if ((d & 0x1F) != 0x05) /* If not accepted, return with error */
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{
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return 0;
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}
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}
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return 1;
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}
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/*-----------------------------------------------------------------------*/
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/* Send a command packet to the card */
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/*-----------------------------------------------------------------------*/
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static
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BYTE send_cmd ( /* Returns command response (bit7==1:Send failed)*/
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BYTE cmd, /* Command byte */
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DWORD arg /* Argument */
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)
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{
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BYTE n, d, buf[6];
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if (cmd & 0x80) { /* ACMD<n> is the command sequense of CMD55-CMD<n> */
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cmd &= 0x7F;
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n = send_cmd(CMD55, 0);
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if (n > 1) return n;
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}
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/* Select the card and wait for ready except to stop multiple block read */
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if (cmd != CMD12) {
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deselect();
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if (!select()) return 0xFF;
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}
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/* Send a command packet */
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buf[0] = 0x40 | cmd; /* Start + Command index */
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#ifdef NOSHIFT
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buf[1] = ((BYTE *)&arg)[3]; /* Argument[31..24] */
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buf[2] = ((BYTE *)&arg)[2]; /* Argument[23..16] */
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buf[3] = ((BYTE *)&arg)[1]; /* Argument[15..8] */
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buf[4] = ((BYTE *)&arg)[0]; /* Argument[7..0] */
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#else
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buf[1] = (BYTE)(arg >> 24); /* Argument[31..24] */
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buf[2] = (BYTE)(arg >> 16); /* Argument[23..16] */
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buf[3] = (BYTE)(arg >> 8); /* Argument[15..8] */
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buf[4] = (BYTE)arg; /* Argument[7..0] */
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#endif
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n = 0x01; /* Dummy CRC + Stop */
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if (cmd == CMD0) n = 0x95; /* (valid CRC for CMD0(0)) */
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if (cmd == CMD8) n = 0x87; /* (valid CRC for CMD8(0x1AA)) */
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buf[5] = n;
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TOUTCHR('L');
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TOUTHEX(buf[0]);
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TOUTHEX(buf[1]);
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TOUTHEX(buf[2]);
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TOUTHEX(buf[3]);
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TOUTHEX(buf[4]);
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TOUTHEX(buf[5]);
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xmit_mmc(buf, 6);
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/* Receive command response */
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if (cmd == CMD12) (void)inp(DATAPORT); /* Skip a stuff byte when stop reading */
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n = 10; /* Wait for a valid response in timeout of 10 attempts */
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do
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{
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d = inp(DATAPORT);
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}
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while ((d & 0x80) && (--n));
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TOUTCHR('P');
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TOUTHEX(d);
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return d; /* Return with the response value */
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}
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/*--------------------------------------------------------------------------
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Public Functions
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---------------------------------------------------------------------------*/
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/*-----------------------------------------------------------------------*/
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/* Get Disk Status */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_status (
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BYTE drv /* Drive number (always 0) */
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)
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{
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if (drv) return STA_NOINIT;
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return Stat;
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}
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DRESULT disk_result (
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BYTE drv /* Drive number (always 0) */
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)
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{
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if (drv) return RES_NOTRDY;
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return RES_OK;
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}
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/*-----------------------------------------------------------------------*/
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/* Initialize Disk Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize (
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BYTE drv /* Physical drive nmuber (0) */
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)
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{
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BYTE n, ty, cmd, buf[4];
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UINT tmr;
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DSTATUS s;
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if (drv) return RES_NOTRDY;
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ty = 0;
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for (n = 5; n; n--) {
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outp(CONTROLPORT, 1); // CS high
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dly_us(10000); /* 10ms. time for SD card to power up */
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for (tmr = 10; tmr; tmr--) outp(DATAPORT, 0xFF); /* Apply 80 dummy clocks and the card gets ready to receive command */
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if (send_cmd(CMD0, 0) == 1) { /* Enter Idle state */
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if (send_cmd(CMD8, 0x1AA) == 1) { /* SDv2? */
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rcvr_mmc(buf, 4); /* Get trailing return value of R7 resp */
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if (buf[2] == 0x01 && buf[3] == 0xAA) { /* The card can work at vdd range of 2.7-3.6V */
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for (tmr = 1000; tmr; tmr--) { /* Wait for leaving idle state (ACMD41 with HCS bit) */
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if (send_cmd(ACMD41, 1UL << 30) == 0) break;
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dly_us(1000);
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}
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if (tmr && send_cmd(CMD58, 0) == 0) { /* Check CCS bit in the OCR */
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rcvr_mmc(buf, 4);
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ty = (buf[0] & 0x40) ? CT_SD2 | CT_BLOCK : CT_SD2; /* SDv2 */
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}
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}
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} else { /* SDv1 or MMCv3 */
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if (send_cmd(ACMD41, 0) <= 1) {
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ty = CT_SD1; cmd = ACMD41; /* SDv1 */
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} else {
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ty = CT_MMC; cmd = CMD1; /* MMCv3 */
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}
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for (tmr = 1000; tmr; tmr--) { /* Wait for leaving idle state */
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if (send_cmd(cmd, 0) == 0) break;
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dly_us(1000);
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}
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if (!tmr || send_cmd(CMD16, 512) != 0) /* Set R/W block length to 512 */
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ty = 0;
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}
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break;
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}
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}
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CardType = ty;
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s = ty ? 0 : STA_NOINIT;
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Stat = s;
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deselect();
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return s;
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}
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/*-----------------------------------------------------------------------*/
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/* Read Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_read (
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BYTE drv, /* Physical drive nmuber (0) */
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BYTE DOSFAR *buff, /* Pointer to the data buffer to store read data */
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DWORD sector, /* Start sector number (LBA) */
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UINT count /* Sector count (1..128) */
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)
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{
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DRESULT dr = disk_result(drv);
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if (dr != RES_OK) return dr;
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if (!(CardType & CT_BLOCK)) sector = DWORDLSHIFT(sector,9); /* Convert LBA to byte address if needed */
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if (count == 1) { /* Single block read */
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if ((send_cmd(CMD17, sector) == 0) /* READ_SINGLE_BLOCK */
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&& rcvr_datablock(buff, 512))
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count = 0;
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}
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else { /* Multiple block read */
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if (send_cmd(CMD18, sector) == 0) { /* READ_MULTIPLE_BLOCK */
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do {
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if (!rcvr_datablock(buff, 512)) break;
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buff += 512;
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} while (--count);
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send_cmd(CMD12, 0); /* STOP_TRANSMISSION */
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}
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}
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deselect();
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return count ? RES_ERROR : RES_OK;
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}
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/*-----------------------------------------------------------------------*/
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/* Write Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_write (
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BYTE drv, /* Physical drive nmuber (0) */
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const BYTE DOSFAR *buff, /* Pointer to the data to be written */
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DWORD sector, /* Start sector number (LBA) */
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UINT count /* Sector count (1..128) */
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)
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{
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DRESULT dr = disk_result(drv);
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if (dr != RES_OK) return dr;
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if (!(CardType & CT_BLOCK)) sector = DWORDLSHIFT(sector,9); /* Convert LBA to byte address if needed */
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if (count == 1) { /* Single block write */
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if ((send_cmd(CMD24, sector) == 0) /* WRITE_BLOCK */
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&& xmit_datablock(buff, 0xFE))
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count = 0;
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}
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else { /* Multiple block write */
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if (CardType & CT_SDC) send_cmd(ACMD23, count);
|
|
if (send_cmd(CMD25, sector) == 0) { /* WRITE_MULTIPLE_BLOCK */
|
|
do {
|
|
if (!xmit_datablock(buff, 0xFC)) break;
|
|
buff += 512;
|
|
} while (--count);
|
|
if (!xmit_datablock(0, 0xFD)) /* STOP_TRAN token */
|
|
count = 1;
|
|
if (!wait_ready()) count = 1; /* Wait for card to write */
|
|
}
|
|
}
|
|
deselect();
|
|
|
|
return count ? RES_ERROR : RES_OK;
|
|
}
|
|
|
|
|
|
/*-----------------------------------------------------------------------*/
|
|
/* Miscellaneous Functions */
|
|
/*-----------------------------------------------------------------------*/
|
|
|
|
DRESULT disk_ioctl (
|
|
BYTE drv, /* Physical drive nmuber (0) */
|
|
BYTE ctrl, /* Control code */
|
|
void DOSFAR *buff /* Buffer to send/receive control data */
|
|
)
|
|
{
|
|
DRESULT res;
|
|
BYTE n, csd[16];
|
|
DWORD cs;
|
|
DRESULT dr = disk_result(drv);
|
|
if (dr != RES_OK) return dr;
|
|
|
|
res = RES_ERROR;
|
|
switch (ctrl) {
|
|
case CTRL_SYNC : /* Make sure that no pending write process */
|
|
if (select()) res = RES_OK;
|
|
break;
|
|
|
|
case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
|
|
if ((send_cmd(CMD9, 0) == 0) && rcvr_datablock(csd, 16)) {
|
|
if ((csd[0] >> 6) == 1) { /* SDC ver 2.00 */
|
|
cs = csd[9] + ((WORD)csd[8] << 8) + ((DWORD)(csd[7] & 63) << 16) + 1;
|
|
*(DWORD DOSFAR *)buff = DWORDLSHIFT(cs,10);
|
|
} else { /* SDC ver 1.XX or MMC */
|
|
n = (csd[5] & 15) + ((csd[10] & 128) >> 7) + ((csd[9] & 3) << 1) + 2;
|
|
cs = (csd[8] >> 6) + ((WORD)csd[7] << 2) + ((WORD)(csd[6] & 3) << 10) + 1;
|
|
*(DWORD DOSFAR *)buff = DWORDLSHIFT(cs,n-9);
|
|
}
|
|
res = RES_OK;
|
|
}
|
|
break;
|
|
|
|
case GET_BLOCK_SIZE : /* Get erase block size in unit of sector (DWORD) */
|
|
*(DWORD DOSFAR *)buff = 128;
|
|
res = RES_OK;
|
|
break;
|
|
|
|
default:
|
|
res = RES_PARERR;
|
|
}
|
|
|
|
deselect();
|
|
|
|
return res;
|
|
}
|
|
|
|
|