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u-boot/common/cmd_fdc.c
Wolfgang Denk 54841ab50c Make sure that argv[] argument pointers are not modified. 
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands.  Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".

This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:

int main (int argc, char **argv)
{
	while (--argc > 0 && **++argv == '-') {
/* ====> */	while (*++*argv) {
			switch (**argv) {
			case 'd':
				debug++;
				break;
			...
			default:
				usage ();
			}
		}
	}
	...
}

The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell.  With the modification, the compiler will prevent this with
an
	error: increment of read-only location '*argv'

N.B.: The code above can be trivially rewritten like this:

	while (--argc > 0 && **++argv == '-') {
		char *arg = *argv;
		while (*++arg) {
			switch (*arg) {
			...

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
2010-07-04 23:55:42 +02:00

848 lines
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/*
* (C) Copyright 2001
* Denis Peter, MPL AG, d.peter@mpl.ch.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
/*
* Floppy Disk support
*/
#include <common.h>
#include <config.h>
#include <command.h>
#include <image.h>
#undef FDC_DEBUG
#ifdef FDC_DEBUG
#define PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
/*#if defined(CONFIG_CMD_DATE) */
/*#include <rtc.h> */
/*#endif */
typedef struct {
int flags; /* connected drives ect */
unsigned long blnr; /* Logical block nr */
uchar drive; /* drive no */
uchar cmdlen; /* cmd length */
uchar cmd[16]; /* cmd desc */
uchar dma; /* if > 0 dma enabled */
uchar result[11]; /* status information */
uchar resultlen; /* lenght of result */
} FDC_COMMAND_STRUCT;
/* flags: only the lower 8bit used:
* bit 0 if set drive 0 is present
* bit 1 if set drive 1 is present
* bit 2 if set drive 2 is present
* bit 3 if set drive 3 is present
* bit 4 if set disk in drive 0 is inserted
* bit 5 if set disk in drive 1 is inserted
* bit 6 if set disk in drive 2 is inserted
* bit 7 if set disk in drive 4 is inserted
*/
/* cmd indexes */
#define COMMAND 0
#define DRIVE 1
#define CONFIG0 1
#define SPEC_HUTSRT 1
#define TRACK 2
#define CONFIG1 2
#define SPEC_HLT 2
#define HEAD 3
#define CONFIG2 3
#define SECTOR 4
#define SECTOR_SIZE 5
#define LAST_TRACK 6
#define GAP 7
#define DTL 8
/* result indexes */
#define STATUS_0 0
#define STATUS_PCN 1
#define STATUS_1 1
#define STATUS_2 2
#define STATUS_TRACK 3
#define STATUS_HEAD 4
#define STATUS_SECT 5
#define STATUS_SECT_SIZE 6
/* Register addresses */
#define FDC_BASE 0x3F0
#define FDC_SRA FDC_BASE + 0 /* Status Register A */
#define FDC_SRB FDC_BASE + 1 /* Status Register B */
#define FDC_DOR FDC_BASE + 2 /* Digital Output Register */
#define FDC_TDR FDC_BASE + 3 /* Tape Drive Register */
#define FDC_DSR FDC_BASE + 4 /* Data rate Register */
#define FDC_MSR FDC_BASE + 4 /* Main Status Register */
#define FDC_FIFO FDC_BASE + 5 /* FIFO */
#define FDC_DIR FDC_BASE + 6 /* Digital Input Register */
#define FDC_CCR FDC_BASE + 7 /* Configuration Control */
/* Commands */
#define FDC_CMD_SENSE_INT 0x08
#define FDC_CMD_CONFIGURE 0x13
#define FDC_CMD_SPECIFY 0x03
#define FDC_CMD_RECALIBRATE 0x07
#define FDC_CMD_READ 0x06
#define FDC_CMD_READ_TRACK 0x02
#define FDC_CMD_READ_ID 0x0A
#define FDC_CMD_DUMP_REG 0x0E
#define FDC_CMD_SEEK 0x0F
#define FDC_CMD_SENSE_INT_LEN 0x01
#define FDC_CMD_CONFIGURE_LEN 0x04
#define FDC_CMD_SPECIFY_LEN 0x03
#define FDC_CMD_RECALIBRATE_LEN 0x02
#define FDC_CMD_READ_LEN 0x09
#define FDC_CMD_READ_TRACK_LEN 0x09
#define FDC_CMD_READ_ID_LEN 0x02
#define FDC_CMD_DUMP_REG_LEN 0x01
#define FDC_CMD_SEEK_LEN 0x03
#define FDC_FIFO_THR 0x0C
#define FDC_FIFO_DIS 0x00
#define FDC_IMPLIED_SEEK 0x01
#define FDC_POLL_DIS 0x00
#define FDC_PRE_TRK 0x00
#define FDC_CONFIGURE FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
#define FDC_MFM_MODE 0x01 /* MFM enable */
#define FDC_SKIP_MODE 0x00 /* skip enable */
#define FDC_TIME_OUT 100000 /* time out */
#define FDC_RW_RETRIES 3 /* read write retries */
#define FDC_CAL_RETRIES 3 /* calibration and seek retries */
/* Disk structure */
typedef struct {
unsigned int size; /* nr of sectors total */
unsigned int sect; /* sectors per track */
unsigned int head; /* nr of heads */
unsigned int track; /* nr of tracks */
unsigned int stretch; /* !=0 means double track steps */
unsigned char gap; /* gap1 size */
unsigned char rate; /* data rate. |= 0x40 for perpendicular */
unsigned char spec1; /* stepping rate, head unload time */
unsigned char fmt_gap;/* gap2 size */
unsigned char hlt; /* head load time */
unsigned char sect_code;/* Sector Size code */
const char * name; /* used only for predefined formats */
} FD_GEO_STRUCT;
/* supported Floppy types (currently only one) */
const static FD_GEO_STRUCT floppy_type[2] = {
{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" }, /* 7 1.44MB 3.5" */
{ 0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL }, /* end of table */
};
static FDC_COMMAND_STRUCT cmd; /* global command struct */
/* If the boot drive number is undefined, we assume it's drive 0 */
#ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
#define CONFIG_SYS_FDC_DRIVE_NUMBER 0
#endif
/* Hardware access */
#ifndef CONFIG_SYS_ISA_IO_STRIDE
#define CONFIG_SYS_ISA_IO_STRIDE 1
#endif
#ifndef CONFIG_SYS_ISA_IO_OFFSET
#define CONFIG_SYS_ISA_IO_OFFSET 0
#endif
/* Supporting Functions */
/* reads a Register of the FDC */
unsigned char read_fdc_reg(unsigned int addr)
{
volatile unsigned char *val =
(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
(addr * CONFIG_SYS_ISA_IO_STRIDE) +
CONFIG_SYS_ISA_IO_OFFSET);
return val [0];
}
/* writes a Register of the FDC */
void write_fdc_reg(unsigned int addr, unsigned char val)
{
volatile unsigned char *tmp =
(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
(addr * CONFIG_SYS_ISA_IO_STRIDE) +
CONFIG_SYS_ISA_IO_OFFSET);
tmp[0]=val;
}
/* waits for an interrupt (polling) */
int wait_for_fdc_int(void)
{
unsigned long timeout;
timeout = FDC_TIME_OUT;
while((read_fdc_reg(FDC_SRA)&0x80)==0) {
timeout--;
udelay(10);
if(timeout==0) /* timeout occured */
return FALSE;
}
return TRUE;
}
/* reads a byte from the FIFO of the FDC and checks direction and RQM bit
of the MSR. returns -1 if timeout, or byte if ok */
int read_fdc_byte(void)
{
unsigned long timeout;
timeout = FDC_TIME_OUT;
while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
/* direction out and ready */
udelay(10);
timeout--;
if(timeout==0) /* timeout occured */
return -1;
}
return read_fdc_reg(FDC_FIFO);
}
/* if the direction of the FIFO is wrong, this routine is used to
empty the FIFO. Should _not_ be used */
int fdc_need_more_output(void)
{
unsigned char c;
while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0) {
c=(unsigned char)read_fdc_byte();
printf("Error: more output: %x\n",c);
}
return TRUE;
}
/* writes a byte to the FIFO of the FDC and checks direction and RQM bit
of the MSR */
int write_fdc_byte(unsigned char val)
{
unsigned long timeout;
timeout = FDC_TIME_OUT;
while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
/* direction in and ready for byte */
timeout--;
udelay(10);
fdc_need_more_output();
if(timeout==0) /* timeout occured */
return FALSE;
}
write_fdc_reg(FDC_FIFO,val);
return TRUE;
}
/* sets up all FDC commands and issues it to the FDC. If
the command causes direct results (no Execution Phase)
the result is be read as well. */
int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
int i;
unsigned long head,track,sect,timeout;
track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
sect = pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
head = sect / pFG->sect; /* head nr */
sect = sect % pFG->sect; /* remaining blocks */
sect++; /* sectors are 1 based */
PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",
pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);
if(head|=0) { /* max heads = 2 */
pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
}
else {
pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
}
pCMD->cmd[TRACK]=(unsigned char) track; /* track */
switch (pCMD->cmd[COMMAND]) {
case FDC_CMD_READ:
pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
pCMD->cmd[GAP]=pFG->gap; /* gap */
pCMD->cmd[DTL]=0xFF; /* DTL */
pCMD->cmdlen=FDC_CMD_READ_LEN;
pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
pCMD->resultlen=0; /* result only after execution */
break;
case FDC_CMD_SEEK:
pCMD->cmdlen=FDC_CMD_SEEK_LEN;
pCMD->resultlen=0; /* no result */
break;
case FDC_CMD_CONFIGURE:
pCMD->cmd[CONFIG0]=0;
pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */
pCMD->cmd[CONFIG2]=FDC_PRE_TRK; /* Precompensation Track */
pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
pCMD->resultlen=0; /* no result */
break;
case FDC_CMD_SPECIFY:
pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
if(pCMD->dma==0)
pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
pCMD->resultlen=0; /* no result */
break;
case FDC_CMD_DUMP_REG:
pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
pCMD->resultlen=10; /* 10 byte result */
break;
case FDC_CMD_READ_ID:
pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
pCMD->resultlen=7; /* 7 byte result */
break;
case FDC_CMD_RECALIBRATE:
pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
pCMD->resultlen=0; /* no result */
break;
break;
case FDC_CMD_SENSE_INT:
pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
pCMD->resultlen=2;
break;
}
for(i=0;i<pCMD->cmdlen;i++) {
/* PRINTF("write cmd%d = 0x%02X\n",i,pCMD->cmd[i]); */
if(write_fdc_byte(pCMD->cmd[i])==FALSE) {
PRINTF("Error: timeout while issue cmd%d\n",i);
return FALSE;
}
}
timeout=FDC_TIME_OUT;
for(i=0;i<pCMD->resultlen;i++) {
while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
timeout--;
if(timeout==0) {
PRINTF(" timeout while reading result%d MSR=0x%02X\n",i,read_fdc_reg(FDC_MSR));
return FALSE;
}
}
pCMD->result[i]=(unsigned char)read_fdc_byte();
}
return TRUE;
}
/* selects the drive assigned in the cmd structur and
switches on the Motor */
void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
{
unsigned char val;
val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
if((read_fdc_reg(FDC_DOR)&val)!=val) {
write_fdc_reg(FDC_DOR,val);
for(val=0;val<255;val++)
udelay(500); /* wait some time to start motor */
}
}
/* switches off the Motor of the specified drive */
void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
{
unsigned char val;
val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
}
/* issues a recalibrate command, waits for interrupt and
* issues a sense_interrupt */
int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;
if(fdc_issue_cmd(pCMD,pFG)==FALSE)
return FALSE;
while(wait_for_fdc_int()!=TRUE);
pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
return(fdc_issue_cmd(pCMD,pFG));
}
/* issues a recalibrate command, waits for interrupt and
* issues a sense_interrupt */
int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
{
pCMD->cmd[COMMAND]=FDC_CMD_SEEK;
if(fdc_issue_cmd(pCMD,pFG)==FALSE)
return FALSE;
while(wait_for_fdc_int()!=TRUE);
pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
return(fdc_issue_cmd(pCMD,pFG));
}
/* terminates current command, by not servicing the FIFO
* waits for interrupt and fills in the result bytes */
int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
{
int i;
for(i=0;i<100;i++)
udelay(500); /* wait 500usec for fifo overrun */
while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occured */
for(i=0;i<7;i++) {
pCMD->result[i]=(unsigned char)read_fdc_byte();
}
return TRUE;
}
/* reads data from FDC, seek commands are issued automatic */
int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
/* first seek to start address */
unsigned long len,lastblk,readblk,i,timeout,ii,offset;
unsigned char pcn,c,retriesrw,retriescal;
unsigned char *bufferw; /* working buffer */
int sect_size;
int flags;
flags=disable_interrupts(); /* switch off all Interrupts */
select_fdc_drive(pCMD); /* switch on drive */
sect_size=0x080<<pFG->sect_code;
retriesrw=0;
retriescal=0;
offset=0;
if(fdc_seek(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
if((pCMD->result[STATUS_0]&0x20)!=0x20) {
printf("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
pcn=pCMD->result[STATUS_PCN]; /* current track */
/* now determine the next seek point */
lastblk=pCMD->blnr + blocks;
/* readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
readblk=pFG->sect-(pCMD->blnr%pFG->sect);
PRINTF("1st nr of block possible read %ld start %ld\n",readblk,pCMD->blnr);
if(readblk>blocks) /* is end within 1st track */
readblk=blocks; /* yes, correct it */
PRINTF("we read %ld blocks start %ld\n",readblk,pCMD->blnr);
bufferw = &buffer[0]; /* setup working buffer */
do {
retryrw:
len=sect_size * readblk;
pCMD->cmd[COMMAND]=FDC_CMD_READ;
if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
for (i=0;i<len;i++) {
timeout=FDC_TIME_OUT;
do {
c=read_fdc_reg(FDC_MSR);
if((c&0xC0)==0xC0) {
bufferw[i]=read_fdc_reg(FDC_FIFO);
break;
}
if((c&0xC0)==0x80) { /* output */
PRINTF("Transfer error transfered: at %ld, MSR=%02X\n",i,c);
if(i>6) {
for(ii=0;ii<7;ii++) {
pCMD->result[ii]=bufferw[(i-7+ii)];
} /* for */
}
if(retriesrw++>FDC_RW_RETRIES) {
if (retriescal++>FDC_CAL_RETRIES) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
else {
PRINTF(" trying to recalibrate Try %d\n",retriescal);
if(fdc_recalibrate(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
retriesrw=0;
goto retrycal;
} /* else >FDC_CAL_RETRIES */
}
else {
PRINTF("Read retry %d\n",retriesrw);
goto retryrw;
} /* else >FDC_RW_RETRIES */
}/* if output */
timeout--;
}while(TRUE);
} /* for len */
/* the last sector of a track or all data has been read,
* we need to get the results */
fdc_terminate(pCMD);
offset+=(sect_size*readblk); /* set up buffer pointer */
bufferw = &buffer[offset];
pCMD->blnr+=readblk; /* update current block nr */
blocks-=readblk; /* update blocks */
if(blocks==0)
break; /* we are finish */
/* setup new read blocks */
/* readblk=pFG->head*pFG->sect; */
readblk=pFG->sect;
if(readblk>blocks)
readblk=blocks;
retrycal:
/* a seek is necessary */
if(fdc_seek(pCMD,pFG)==FALSE) {
stop_fdc_drive(pCMD);
enable_interrupts();
return FALSE;
}
if((pCMD->result[STATUS_0]&0x20)!=0x20) {
PRINTF("Seek error Status: %02X\n",pCMD->result[STATUS_0]);
stop_fdc_drive(pCMD);
return FALSE;
}
pcn=pCMD->result[STATUS_PCN]; /* current track */
}while(TRUE); /* start over */
stop_fdc_drive(pCMD); /* switch off drive */
enable_interrupts();
return TRUE;
}
/* Scan all drives and check if drive is present and disk is inserted */
int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
int i,drives,state;
/* OK procedure of data book is satisfied.
* trying to get some information over the drives */
state=0; /* no drives, no disks */
for(drives=0;drives<4;drives++) {
pCMD->drive=drives;
select_fdc_drive(pCMD);
pCMD->blnr=0; /* set to the 1st block */
if(fdc_recalibrate(pCMD,pFG)==FALSE)
continue;
if((pCMD->result[STATUS_0]&0x10)==0x10)
continue;
/* ok drive connected check for disk */
state|=(1<<drives);
pCMD->blnr=pFG->size; /* set to the last block */
if(fdc_seek(pCMD,pFG)==FALSE)
continue;
pCMD->blnr=0; /* set to the 1st block */
if(fdc_recalibrate(pCMD,pFG)==FALSE)
continue;
pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
if(fdc_issue_cmd(pCMD,pFG)==FALSE)
continue;
state|=(0x10<<drives);
}
stop_fdc_drive(pCMD);
for(i=0;i<4;i++) {
PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s\n",i,
((state&(1<<i))==(1<<i)) ? "":"not ",
((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
}
pCMD->flags=state;
return TRUE;
}
/**************************************************************************
* int fdc_setup
* setup the fdc according the datasheet
* assuming in PS2 Mode
*/
int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
{
int i;
#ifdef CONFIG_SYS_FDC_HW_INIT
fdc_hw_init ();
#endif
/* first, we reset the FDC via the DOR */
write_fdc_reg(FDC_DOR,0x00);
for(i=0; i<255; i++) /* then we wait some time */
udelay(500);
/* then, we clear the reset in the DOR */
pCMD->drive=drive;
select_fdc_drive(pCMD);
/* initialize the CCR */
write_fdc_reg(FDC_CCR,pFG->rate);
/* then initialize the DSR */
write_fdc_reg(FDC_DSR,pFG->rate);
if(wait_for_fdc_int()==FALSE) {
PRINTF("Time Out after writing CCR\n");
return FALSE;
}
/* now issue sense Interrupt and status command
* assuming only one drive present (drive 0) */
pCMD->dma=0; /* we don't use any dma at all */
for(i=0;i<4;i++) {
/* issue sense interrupt for all 4 possible drives */
pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
PRINTF("Sense Interrupt for drive %d failed\n",i);
}
}
/* issue the configure command */
pCMD->drive=drive;
select_fdc_drive(pCMD);
pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;
if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
PRINTF(" configure timeout\n");
stop_fdc_drive(pCMD);
return FALSE;
}
/* issue specify command */
pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;
if(fdc_issue_cmd(pCMD,pFG)==FALSE) {
PRINTF(" specify timeout\n");
stop_fdc_drive(pCMD);
return FALSE;
}
/* then, we clear the reset in the DOR */
/* fdc_check_drive(pCMD,pFG); */
/* write_fdc_reg(FDC_DOR,0x04); */
return TRUE;
}
#if defined(CONFIG_CMD_FDOS)
/* Low level functions for the Floppy-DOS layer */
/**************************************************************************
* int fdc_fdos_init
* initialize the FDC layer
*
*/
int fdc_fdos_init (int drive)
{
FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
FDC_COMMAND_STRUCT *pCMD = &cmd;
/* setup FDC and scan for drives */
if(fdc_setup(drive,pCMD,pFG)==FALSE) {
printf("\n** Error in setup FDC **\n");
return FALSE;
}
if(fdc_check_drive(pCMD,pFG)==FALSE) {
printf("\n** Error in check_drives **\n");
return FALSE;
}
if((pCMD->flags&(1<<drive))==0) {
/* drive not available */
printf("\n** Drive %d not available **\n",drive);
return FALSE;
}
if((pCMD->flags&(0x10<<drive))==0) {
/* no disk inserted */
printf("\n** No disk inserted in drive %d **\n",drive);
return FALSE;
}
/* ok, we have a valid source */
pCMD->drive=drive;
/* read first block */
pCMD->blnr=0;
return TRUE;
}
/**************************************************************************
* int fdc_fdos_seek
* parameter is a block number
*/
int fdc_fdos_seek (int where)
{
FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
FDC_COMMAND_STRUCT *pCMD = &cmd;
pCMD -> blnr = where ;
return (fdc_seek (pCMD, pFG));
}
/**************************************************************************
* int fdc_fdos_read
* the length is in block number
*/
int fdc_fdos_read (void *buffer, int len)
{
FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
FDC_COMMAND_STRUCT *pCMD = &cmd;
return (fdc_read_data (buffer, len, pCMD, pFG));
}
#endif
#if defined(CONFIG_CMD_FDC)
/****************************************************************************
* main routine do_fdcboot
*/
int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
FDC_COMMAND_STRUCT *pCMD = &cmd;
unsigned long addr,imsize;
image_header_t *hdr; /* used for fdc boot */
unsigned char boot_drive;
int i,nrofblk;
char *ep;
int rcode = 0;
#if defined(CONFIG_FIT)
const void *fit_hdr = NULL;
#endif
switch (argc) {
case 1:
addr = CONFIG_SYS_LOAD_ADDR;
boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
break;
case 2:
addr = simple_strtoul(argv[1], NULL, 16);
boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;
break;
case 3:
addr = simple_strtoul(argv[1], NULL, 16);
boot_drive=simple_strtoul(argv[2], NULL, 10);
break;
default:
cmd_usage(cmdtp);
return 1;
}
/* setup FDC and scan for drives */
if(fdc_setup(boot_drive,pCMD,pFG)==FALSE) {
printf("\n** Error in setup FDC **\n");
return 1;
}
if(fdc_check_drive(pCMD,pFG)==FALSE) {
printf("\n** Error in check_drives **\n");
return 1;
}
if((pCMD->flags&(1<<boot_drive))==0) {
/* drive not available */
printf("\n** Drive %d not availabe **\n",boot_drive);
return 1;
}
if((pCMD->flags&(0x10<<boot_drive))==0) {
/* no disk inserted */
printf("\n** No disk inserted in drive %d **\n",boot_drive);
return 1;
}
/* ok, we have a valid source */
pCMD->drive=boot_drive;
/* read first block */
pCMD->blnr=0;
if(fdc_read_data((unsigned char *)addr,1,pCMD,pFG)==FALSE) {
printf("\nRead error:");
for(i=0;i<7;i++)
printf("result%d: 0x%02X\n",i,pCMD->result[i]);
return 1;
}
switch (genimg_get_format ((void *)addr)) {
case IMAGE_FORMAT_LEGACY:
hdr = (image_header_t *)addr;
image_print_contents (hdr);
imsize = image_get_image_size (hdr);
break;
#if defined(CONFIG_FIT)
case IMAGE_FORMAT_FIT:
fit_hdr = (const void *)addr;
puts ("Fit image detected...\n");
imsize = fit_get_size (fit_hdr);
break;
#endif
default:
puts ("** Unknown image type\n");
return 1;
}
nrofblk=imsize/512;
if((imsize%512)>0)
nrofblk++;
printf("Loading %ld Bytes (%d blocks) at 0x%08lx..\n",imsize,nrofblk,addr);
pCMD->blnr=0;
if(fdc_read_data((unsigned char *)addr,nrofblk,pCMD,pFG)==FALSE) {
/* read image block */
printf("\nRead error:");
for(i=0;i<7;i++)
printf("result%d: 0x%02X\n",i,pCMD->result[i]);
return 1;
}
printf("OK %ld Bytes loaded.\n",imsize);
flush_cache (addr, imsize);
#if defined(CONFIG_FIT)
/* This cannot be done earlier, we need complete FIT image in RAM first */
if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
if (!fit_check_format (fit_hdr)) {
puts ("** Bad FIT image format\n");
return 1;
}
fit_print_contents (fit_hdr);
}
#endif
/* Loading ok, update default load address */
load_addr = addr;
/* Check if we should attempt an auto-start */
if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
char *local_args[2];
extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
local_args[0] = argv[0];
local_args[1] = NULL;
printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
do_bootm (cmdtp, 0, 1, local_args);
rcode ++;
}
return rcode;
}
U_BOOT_CMD(
fdcboot, 3, 1, do_fdcboot,
"boot from floppy device",
"loadAddr drive"
);
#endif
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