Initial revision
diff --git a/common/cmd_fdc.c b/common/cmd_fdc.c
new file mode 100644
index 0000000..712c14b
--- /dev/null
+++ b/common/cmd_fdc.c
@@ -0,0 +1,735 @@
+/*
+ * (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 (CONFIG_COMMANDS & CFG_CMD_DATE)
+#include <rtc.h>
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_FDC)
+
+
+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 */
+
+/* Supporting Functions */
+/* reads a Register of the FDC */
+unsigned char read_fdc_reg(unsigned int addr)
+{
+ volatile unsigned char *val = (volatile unsigned char *)(CFG_ISA_IO_BASE_ADDRESS | addr);
+ 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 *)(CFG_ISA_IO_BASE_ADDRESS | addr);
+ 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("Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)\n",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)
+ break;
+ if((pCMD->result[STATUS_0]&0x10)==0x10)
+ break;
+ /* ok drive connected check for disk */
+ state|=(1<<drives);
+ pCMD->blnr=pFG->size; /* set to the last block */
+ if(fdc_seek(pCMD,pFG)==FALSE)
+ break;
+ pCMD->blnr=0; /* set to the 1st block */
+ if(fdc_recalibrate(pCMD,pFG)==FALSE)
+ break;
+ pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;
+ if(fdc_issue_cmd(pCMD,pFG)==FALSE)
+ break;
+ 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(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
+{
+
+ int i;
+ /* 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=0;
+ 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);
+ }
+ }
+ /* assuming drive 0 for rest of configuration
+ * issue the configure command */
+ pCMD->drive=0;
+ 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;
+}
+
+/****************************************************************************
+ * main routine do_fdcboot
+ */
+int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char *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;
+
+ switch (argc) {
+ case 1:
+ addr = CFG_LOAD_ADDR;
+ boot_drive=0; /* default boot from drive 0 */
+ break;
+ case 2:
+ addr = simple_strtoul(argv[1], NULL, 16);
+ boot_drive=0; /* default boot from drive 0 */
+ break;
+ case 3:
+ addr = simple_strtoul(argv[1], NULL, 16);
+ boot_drive=simple_strtoul(argv[2], NULL, 10);
+ break;
+ default:
+ printf ("Usage:\n%s\n", cmdtp->usage);
+ return 1;
+ }
+ /* setup FDC and scan for drives */
+ if(fdc_setup(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;
+ }
+ hdr = (image_header_t *)addr;
+ if (hdr->ih_magic != IH_MAGIC) {
+ printf ("Bad Magic Number\n");
+ return 1;
+ }
+ print_image_hdr(hdr);
+
+ imsize= hdr->ih_size+sizeof(image_header_t);
+ 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);
+ /* Loading ok, update default load address */
+
+ load_addr = addr;
+ if(hdr->ih_type == IH_TYPE_KERNEL) {
+ /* 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;
+}
+
+
+
+#endif /* CONFIG_COMMANDS & CFG_CMD_FDC */
+
+
