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historical/m0-applesillicon.git/xnu-qemu-arm64-5.1.0/roms/openbios/drivers/floppy.c
ThatLinuxFan 4061214e6a phht hahahahaah
2024-01-16 11:20:27 -06:00

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#include "config.h"
#include "libopenbios/bindings.h"
#include "kernel/kernel.h"
#include "libc/byteorder.h"
#include "libc/vsprintf.h"
#include "drivers/drivers.h"
#include "timer.h"
/* DECLARE data structures for the nodes. */
DECLARE_UNNAMED_NODE( ob_floppy, 0, 2*sizeof(int) );
#ifdef CONFIG_DEBUG_FLOPPY
#define printk_info printk
#define printk_debug printk
#else
#define printk_info(x ...)
#define printk_debug(x ...)
#endif
#define printk_err printk
#define FD_DRIVE 0
#define FD_STATUS_A (0) /* Status register A */
#define FD_STATUS_B (1) /* Status register B */
#define FD_DOR (2) /* Digital Output Register */
#define FD_TDR (3) /* Tape Drive Register */
#define FD_STATUS (4) /* Main Status Register */
#define FD_DSR (4) /* Data Rate Select Register (old) */
#define FD_DATA (5) /* Data Transfer (FIFO) register */
#define FD_DIR (7) /* Digital Input Register (read) */
#define FD_DCR (7) /* Diskette Control Register (write)*/
/* Bit of FD_STATUS_A */
#define STA_INT_PENDING 0x80 /* Interrupt Pending */
/* DOR */
#define DOR_DRIVE0 0x00
#define DOR_DRIVE1 0x01
#define DOR_DRIVE2 0x02
#define DOR_DRIVE3 0x03
#define DOR_DRIVE_MASK 0x03
#define DOR_NO_RESET 0x04
#define DOR_DMA_EN 0x08
#define DOR_MOT_EN0 0x10
#define DOR_MOT_EN1 0x20
#define DOR_MOT_EN2 0x40
#define DOR_MOT_EN3 0x80
/* Bits of main status register */
#define STATUS_BUSYMASK 0x0F /* drive busy mask */
#define STATUS_BUSY 0x10 /* FDC busy */
#define STATUS_NON_DMA 0x20 /* 0- DMA mode */
#define STATUS_DIR 0x40 /* 0- cpu->fdc */
#define STATUS_READY 0x80 /* Data reg ready */
/* Bits of FD_ST0 */
#define ST0_DS 0x03 /* drive select mask */
#define ST0_HA 0x04 /* Head (Address) */
#define ST0_NR 0x08 /* Not Ready */
#define ST0_ECE 0x10 /* Equipment check error */
#define ST0_SE 0x20 /* Seek end */
#define ST0_INTR 0xC0 /* Interrupt code mask */
#define ST0_INTR_OK (0 << 6)
#define ST0_INTR_ERROR (1 << 6)
#define ST0_INTR_INVALID (2 << 6)
#define ST0_INTR_POLL_ERROR (3 << 6)
/* Bits of FD_ST1 */
#define ST1_MAM 0x01 /* Missing Address Mark */
#define ST1_WP 0x02 /* Write Protect */
#define ST1_ND 0x04 /* No Data - unreadable */
#define ST1_OR 0x10 /* OverRun */
#define ST1_CRC 0x20 /* CRC error in data or addr */
#define ST1_EOC 0x80 /* End Of Cylinder */
/* Bits of FD_ST2 */
#define ST2_MAM 0x01 /* Missing Address Mark (again) */
#define ST2_BC 0x02 /* Bad Cylinder */
#define ST2_SNS 0x04 /* Scan Not Satisfied */
#define ST2_SEH 0x08 /* Scan Equal Hit */
#define ST2_WC 0x10 /* Wrong Cylinder */
#define ST2_CRC 0x20 /* CRC error in data field */
#define ST2_CM 0x40 /* Control Mark = deleted */
/* Bits of FD_ST3 */
#define ST3_HA 0x04 /* Head (Address) */
#define ST3_DS 0x08 /* drive is double-sided */
#define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */
#define ST3_RY 0x20 /* drive is ready */
#define ST3_WP 0x40 /* Write Protect */
#define ST3_FT 0x80 /* Drive Fault */
/* Values for FD_COMMAND */
#define FD_RECALIBRATE 0x07 /* move to track 0 */
#define FD_SEEK 0x0F /* seek track */
#define FD_READ 0xA6 /* read with MT, SKip deleted */
#define FD_WRITE 0xC5 /* write with MT, MFM */
#define FD_SENSEI 0x08 /* Sense Interrupt Status */
#define FD_SPECIFY 0x03 /* specify HUT etc */
#define FD_FORMAT 0x4D /* format one track */
#define FD_VERSION 0x10 /* get version code */
#define FD_CONFIGURE 0x13 /* configure FIFO operation */
#define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */
#define FD_GETSTATUS 0x04 /* read ST3 */
#define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */
#define FD_READID 0xEA /* prints the header of a sector */
#define FD_UNLOCK 0x14 /* Fifo config unlock */
#define FD_LOCK 0x94 /* Fifo config lock */
#define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */
#define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */
/* the following commands are new in the 82078. They are not used in the
* floppy driver, except the first three. These commands may be useful for apps
* which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at
* http://www-techdoc.intel.com/docs/periph/fd_contr/datasheets/ */
#define FD_PARTID 0x18 /* part id ("extended" version cmd) */
#define FD_SAVE 0x2e /* save fdc regs for later restore */
#define FD_DRIVESPEC 0x8e /* drive specification: Access to the
* 2 Mbps data transfer rate for tape
* drives */
#define FD_RESTORE 0x4e /* later restore */
#define FD_POWERDOWN 0x27 /* configure FDC's powersave features */
#define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */
#define FD_OPTION 0x33 /* ISO format (which is a clean way to
* pack more sectors on a track) */
/* FDC version return types */
#define FDC_NONE 0x00
#define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION
FAILS EARLY */
#define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */
#define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */
#define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */
#define FDC_82072A 0x45 /* 82072A (on Sparcs) */
#define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */
#define FDC_82077 0x52 /* 82077AA-1 */
#define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */
#define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */
#define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */
#define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB
* SCSI/EIDE/Floppy controller) */
#define FDC_87306 0x63 /* National Semiconductor PC 87306 */
/*
* Beware: the fdc type list is roughly sorted by increasing features.
* Presence of features is tested by comparing the FDC version id with the
* "oldest" version that has the needed feature.
* If during FDC detection, an obscure test fails late in the sequence, don't
* assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse.
* This is especially true if the tests are unneeded.
*/
/* Parameters for a 1.44 3.5" disk */
#define DISK_H1440_SIZE 2880
#define DISK_H1440_SECT 18
#define DISK_H1440_HEAD 2
#define DISK_H1440_TRACK 80
#define DISK_H1440_STRETCH 0
#define DISK_H1440_GAP 0x1B
#define DISK_H1440_RATE 0x00
#define DISK_H1440_SPEC1 0xCF
#define DISK_H1440_FMT_GAP 0x6C
/* Parameters for a 1.44 3.5" drive */
#define DRIVE_H1440_MAX_DTR 500
#define DRIVE_H1440_HLT 16 /* ms */
#define DRIVE_H1440_HUT 16 /* ms */
#define DRIVE_H1440_SRT 4000 /* us */
#define DRIVE_H1440_SPINUP 400 /* ms */
#define DRIVE_H1440_SPINDOWN 3000 /* ms */
#define DRIVE_H1440_SPINDOWN_OFFSET 10
#define DRIVE_H1440_SELECT_DELAY 20 /* ms */
#define DRIVE_H1440_RPS 5
#define DRIVE_H1440_TRACKS 83
#define DRIVE_H1440_TIMEOUT 3000 /* ms */
#define DRIVE_H1440_INTERLEAVE_SECT 20
/* Floppy drive configuration */
#define FIFO_DEPTH 10
#define USE_IMPLIED_SEEK 0
#define USE_FIFO 1
#define FIFO_THRESHOLD 10
#define TRACK_PRECOMPENSATION 0
#define SLOW_FLOPPY 0
#define FD_RESET_DELAY 20 /* microseconds */
/*
* FDC state
*/
static struct drive_state {
unsigned track;
} drive_state[1];
static struct floppy_fdc_state {
int in_sync;
int spec1; /* spec1 value last used */
int spec2; /* spec2 value last used */
int dtr;
unsigned char dor;
unsigned char version; /* FDC version code */
void (*fdc_outb)(unsigned char data, unsigned long port);
unsigned char (*fdc_inb)(unsigned long port);
unsigned long io_base;
unsigned long mmio_base;
} fdc_state;
/* Synchronization of FDC access. */
#define FD_COMMAND_NONE -1
#define FD_COMMAND_ERROR 2
#define FD_COMMAND_OKAY 3
/*
* globals used by 'result()'
*/
#define MAX_REPLIES 16
static void show_floppy(void);
static void floppy_reset(void);
/*
* IO port operations
*/
static unsigned char
ob_fdc_inb(unsigned long port)
{
return inb(fdc_state.io_base + port);
}
static void
ob_fdc_outb(unsigned char data, unsigned long port)
{
outb(data, fdc_state.io_base + port);
}
/*
* MMIO operations
*/
static unsigned char
ob_fdc_mmio_readb(unsigned long port)
{
return *(unsigned char *)(fdc_state.mmio_base + port);
}
static void
ob_fdc_mmio_writeb(unsigned char data, unsigned long port)
{
*(unsigned char *)(fdc_state.mmio_base + port) = data;
}
static int set_dor(char mask, char data)
{
unsigned char newdor,olddor;
olddor = fdc_state.dor;
newdor = (olddor & mask) | data;
if (newdor != olddor){
fdc_state.dor = newdor;
fdc_state.fdc_outb(newdor, FD_DOR);
}
return olddor;
}
/* waits until the fdc becomes ready */
static int wait_til_ready(void)
{
int counter, status;
for (counter = 0; counter < 10000; counter++) {
status = fdc_state.fdc_inb(FD_STATUS);
if (status & STATUS_READY) {
return status;
}
}
printk_debug("Getstatus times out (%x)\n", status);
show_floppy();
return -3;
}
/* sends a command byte to the fdc */
static int output_byte(unsigned char byte)
{
int status;
if ((status = wait_til_ready()) < 0)
return status;
if ((status & (STATUS_READY|STATUS_DIR|STATUS_NON_DMA)) == STATUS_READY){
fdc_state.fdc_outb(byte,FD_DATA);
return 0;
}
printk_debug("Unable to send byte %x to FDC_STATE. Status=%x\n",
byte, status);
show_floppy();
return -2;
}
/* gets the response from the fdc */
static int result(unsigned char *reply_buffer, int max_replies)
{
int i, status=0;
for(i=0; i < max_replies; i++) {
if ((status = wait_til_ready()) < 0)
break;
status &= STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_NON_DMA;
if ((status & ~STATUS_BUSY) == STATUS_READY){
return i;
}
if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY))
reply_buffer[i] = fdc_state.fdc_inb(FD_DATA);
else
break;
}
if (i == max_replies)
return i;
printk_debug("get result error. Last status=%x Read bytes=%d\n",
status, i);
show_floppy();
return -1;
}
#define MORE_OUTPUT -2
/* does the fdc need more output? */
static int need_more_output(void)
{
unsigned char reply_buffer[MAX_REPLIES];
int status;
if ((status = wait_til_ready()) < 0)
return -1;
if ((status & (STATUS_READY|STATUS_DIR|STATUS_NON_DMA)) == STATUS_READY)
return MORE_OUTPUT;
return result(reply_buffer, MAX_REPLIES);
}
static int output_command(unsigned char *cmd, int count)
{
int i, status;
for(i = 0; i < count; i++) {
if ((status = output_byte(cmd[i])) < 0) {
printk_err("full command not acceppted, status =%x\n",
status);
return -1;
}
}
return 0;
}
static int output_new_command(unsigned char *cmd, int count)
{
int i, status;
if ((status = output_byte(cmd[0])) < 0)
return -1;
if (need_more_output() != MORE_OUTPUT)
return -1;
for(i = 1; i < count; i++) {
if ((status = output_byte(cmd[i])) < 0) {
printk_err("full new command not acceppted, status =%d\n",
status);
return -1;
}
}
return 0;
}
/* Collect pending interrupt status */
static unsigned char collect_interrupt(void)
{
unsigned char pcn = 0xff;
unsigned char reply_buffer[MAX_REPLIES];
int nr;
#ifdef CONFIG_DEBUG_FLOPPY
int i, status;
#endif
nr = result(reply_buffer, MAX_REPLIES);
if (nr != 0) {
printk_debug("SENSEI\n");
}
else {
int max_sensei = 4;
do {
if (output_byte(FD_SENSEI) < 0)
break;
nr = result(reply_buffer, MAX_REPLIES);
if (nr == 2) {
pcn = reply_buffer[1];
printk_debug("SENSEI %02x %02x\n",
reply_buffer[0], reply_buffer[1]);
}
max_sensei--;
}while(((reply_buffer[0] & 0x83) != FD_DRIVE) && (nr == 2) && max_sensei);
#ifdef CONFIG_DEBUG_FLOPPY
status = fdc_state.fdc_inb(FD_STATUS);
printk_debug("status = %x, reply_buffer=", status);
for(i = 0; i < nr; i++) {
printk_debug(" %x",
reply_buffer[i]);
}
printk_debug("\n");
#else
fdc_state.fdc_inb(FD_STATUS);
#endif
}
return pcn;
}
/* selects the fdc and drive, and enables the fdc's input/dma, and it's motor. */
static void set_drive(int drive)
{
int fdc = (drive >> 2) & 1;
int status;
unsigned new_dor;
if (drive > 3) {
printk_err("bad drive value\n");
return;
}
if (fdc != 0) {
printk_err("bad fdc value\n");
return;
}
drive &= 3;
#if 0
new_dor = 8; /* Enable the controller */
#else
new_dor = 0; /* Don't enable DMA on the controller */
#endif
new_dor |= (1 << (drive + 4)); /* Spinup the selected drive */
new_dor |= drive; /* Select the drive for commands as well */
set_dor(0xc, new_dor);
mdelay(DRIVE_H1440_SPINUP);
status = fdc_state.fdc_inb(FD_STATUS);
printk_debug("set_drive status = %02x, new_dor = %02x\n",
status, new_dor);
if (status != STATUS_READY) {
printk_err("set_drive bad status\n");
}
}
/* Disable the motor for a given floppy drive */
static void floppy_motor_off(int drive)
{
unsigned mask;
printk_debug("floppy_motor_off\n");
/* fix the number of drives */
drive &= 3;
/* Clear the bit for the drive we care about */
mask = 0xff;
mask &= ~(1 << (drive +4));
/* Now clear the bit in the Digital Output Register */
set_dor(mask, 0);
}
/* Set the FDC's data transfer rate on behalf of the specified drive.
* NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
* of the specify command (i.e. using the fdc_specify function).
*/
static void fdc_dtr(unsigned rate)
{
rate &= 3;
/* If data rate not already set to desired value, set it. */
if (fdc_state.in_sync && (rate == fdc_state.dtr))
return;
/* Set dtr */
fdc_state.fdc_outb(rate, FD_DCR);
/* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
* need a stabilization period of several milliseconds to be
* enforced after data rate changes before R/W operations.
* Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
*/
fdc_state.dtr = rate & 3;
mdelay(5);
} /* fdc_dtr */
static int fdc_configure(int use_implied_seek, int use_fifo,
unsigned fifo_threshold, unsigned precompensation)
{
unsigned config_bits;
unsigned char cmd[4];
/* 0 EIS EFIFO POLL FIFOOTHR[4] */
/* santize parameters */
config_bits = fifo_threshold & 0xf;
config_bits |= (1 << 4); /* Always disable background floppy poll */
config_bits |= (!use_fifo) << 5;
config_bits |= (!!use_implied_seek) << 6;
precompensation &= 0xff; /* pre-compensation from track 0 upwards */
cmd[0] = FD_CONFIGURE;
cmd[1] = 0;
cmd[2] = config_bits;
cmd[3] = precompensation;
/* Turn on FIFO */
if (output_new_command(cmd, 4) < 0)
return 0;
return 1;
}
#define NOMINAL_DTR 500
/* Issue a "SPECIFY" command to set the step rate time, head unload time,
* head load time, and DMA disable flag to values needed by floppy.
*
* The value "dtr" is the data transfer rate in Kbps. It is needed
* to account for the data rate-based scaling done by the 82072 and 82077
* FDC types. This parameter is ignored for other types of FDCs (i.e.
* 8272a).
*
* Note that changing the data transfer rate has a (probably deleterious)
* effect on the parameters subject to scaling for 82072/82077 FDCs, so
* fdc_specify is called again after each data transfer rate
* change.
*
* srt: 1000 to 16000 in microseconds
* hut: 16 to 240 milliseconds
* hlt: 2 to 254 milliseconds
*
* These values are rounded up to the next highest available delay time.
*/
static void fdc_specify(
unsigned head_load_time, unsigned head_unload_time, unsigned step_rate)
{
unsigned char cmd[3];
unsigned long srt, hlt, hut;
unsigned long dtr = NOMINAL_DTR;
unsigned long scale_dtr = NOMINAL_DTR;
int hlt_max_code = 0x7f;
int hut_max_code = 0xf;
printk_debug("fdc_specify\n");
switch (DISK_H1440_RATE & 0x03) {
case 3:
dtr = 1000;
break;
case 1:
dtr = 300;
if (fdc_state.version >= FDC_82078) {
/* chose the default rate table, not the one
* where 1 = 2 Mbps */
cmd[0] = FD_DRIVESPEC;
cmd[1] = FD_DRIVE & 3;
cmd[2] = 0xc0;
output_new_command(cmd,3);
/* FIXME how do I handle errors here? */
}
break;
case 2:
dtr = 250;
break;
}
if (fdc_state.version >= FDC_82072) {
scale_dtr = dtr;
hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
}
/* Convert step rate from microseconds to milliseconds and 4 bits */
srt = 16 - (step_rate*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
if (SLOW_FLOPPY) {
srt = srt / 4;
}
if (srt > 0xf) {
srt = 0xf;
}
hlt = (head_load_time*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
if (hlt < 0x01)
hlt = 0x01;
else if (hlt > 0x7f)
hlt = hlt_max_code;
hut = (head_unload_time*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
if (hut < 0x1)
hut = 0x1;
else if (hut > 0xf)
hut = hut_max_code;
cmd[0] = FD_SPECIFY;
cmd[1] = (srt << 4) | hut;
cmd[2] = (hlt << 1) | 1; /* Always disable DMA */
/* If these parameters did not change, just return with success */
if (!fdc_state.in_sync || fdc_state.spec1 != cmd[1] || fdc_state.spec2 != cmd[2]) {
/* Go ahead and set spec1 and spec2 */
output_command(cmd, 3);
/* FIXME how do I handle errors here... */
printk_info("FD_SPECIFY(%02x, %02x)\n", cmd[1], cmd[2]);
}
} /* fdc_specify */
/*
* reset is done by pulling bit 2 of DOR low for a while (old FDCs),
* or by setting the self clearing bit 7 of STATUS (newer FDCs)
*/
static void reset_fdc(void)
{
unsigned char reply[MAX_REPLIES];
fdc_state.in_sync = 0;
/* Pseudo-DMA may intercept 'reset finished' interrupt. */
/* Irrelevant for systems with true DMA (i386). */
if (fdc_state.version >= FDC_82072A)
fdc_state.fdc_outb(0x80 | (fdc_state.dtr &3), FD_DSR);
else {
fdc_state.fdc_outb(fdc_state.dor & ~DOR_NO_RESET, FD_DOR);
udelay(FD_RESET_DELAY);
fdc_state.fdc_outb(fdc_state.dor, FD_DOR);
}
result(reply, MAX_REPLIES);
}
static void show_floppy(void)
{
printk_debug("\n");
printk_debug("floppy driver state\n");
printk_debug("-------------------\n");
printk_debug("fdc_bytes: %02x %02x xx %02x %02x %02x xx %02x\n",
fdc_state.fdc_inb(FD_STATUS_A),
fdc_state.fdc_inb(FD_STATUS_B),
fdc_state.fdc_inb(FD_TDR),
fdc_state.fdc_inb(FD_STATUS),
fdc_state.fdc_inb(FD_DATA),
fdc_state.fdc_inb(FD_DIR));
printk_debug("status=%x\n", fdc_state.fdc_inb(FD_STATUS));
printk_debug("\n");
}
static void floppy_recalibrate(void)
{
unsigned char cmd[2];
unsigned char reply[MAX_REPLIES];
int nr, success;
success = 0;
do {
printk_debug("floppy_recalibrate\n");
/* Send the recalibrate command to the controller.
* We don't have interrupts or anything we can poll
* so we have to guess when it is done.
*/
cmd[0] = FD_RECALIBRATE;
cmd[1] = 0;
if (output_command(cmd, 2) < 0)
continue;
/* Sleep for the maximum time the recalibrate command
* can run.
*/
mdelay(80*DRIVE_H1440_SRT/1000);
/* Now call FD_SENSEI to end the command
* and collect up the reply.
*/
if (output_byte(FD_SENSEI) < 0)
continue;
nr = result(reply, MAX_REPLIES);
/* Now see if we have succeeded in our seek */
success =
/* We have the right size result */
(nr == 2) &&
/* The command didn't terminate in error */
((reply[0] & ST0_INTR) == ST0_INTR_OK) &&
/* We finished a seek */
(reply[0] & ST0_SE) &&
/* We are at cylinder 0 */
(reply[1] == 0);
} while(!success);
/* Remember we are at track 0 */
drive_state[FD_DRIVE].track = 0;
}
static int floppy_seek(unsigned track)
{
unsigned char cmd[3];
unsigned char reply[MAX_REPLIES];
int nr, success;
unsigned distance, old_track;
/* Look up the old track and see if we need to
* do anything.
*/
old_track = drive_state[FD_DRIVE].track;
if (old_track == track) {
return 1;
}
/* Compute the distance we are about to move,
* We need to know this so we know how long to sleep...
*/
distance = (old_track > track)?(old_track - track):(track - old_track);
distance += 1;
/* Send the seek command to the controller.
* We don't have interrupts or anything we can poll
* so we have to guess when it is done.
*/
cmd[0] = FD_SEEK;
cmd[1] = FD_DRIVE;
cmd[2] = track;
if (output_command(cmd, 3) < 0)
return 0;
/* Sleep for the time it takes to step throuhg distance tracks.
*/
mdelay(distance*DRIVE_H1440_SRT/1000);
/* Now call FD_SENSEI to end the command
* and collect up the reply.
*/
cmd[0] = FD_SENSEI;
if (output_command(cmd, 1) < 0)
return 0;
nr = result(reply, MAX_REPLIES);
/* Now see if we have succeeded in our seek */
success =
/* We have the right size result */
(nr == 2) &&
/* The command didn't terminate in error */
((reply[0] & ST0_INTR) == ST0_INTR_OK) &&
/* We finished a seek */
(reply[0] & ST0_SE) &&
/* We are at cylinder 0 */
(reply[1] == track);
if (success)
drive_state[FD_DRIVE].track = track;
else {
printk_debug("seek failed\n");
printk_debug("nr = %d\n", nr);
printk_debug("ST0 = %02x\n", reply[0]);
printk_debug("PCN = %02x\n", reply[1]);
printk_debug("status = %d\n", fdc_state.fdc_inb(FD_STATUS));
}
return success;
}
static int read_ok(unsigned head)
{
unsigned char results[7];
int result_ok;
int nr;
/* read back the read results */
nr = result(results, 7);
/* Now see if they say we are o.k. */
result_ok = 0;
/* Are my result bytes o.k.? */
if (nr == 7) {
/* Are we o.k. */
if ((results[0] & ST0_INTR) == ST0_INTR_OK) {
result_ok = 1;
}
/* Or did we get just an overflow error */
else if (((results[0] & ST0_INTR) == ST0_INTR_ERROR) &&
(results[1]== ST1_OR) &&
(results[2] == 0)) {
result_ok = 1;
}
/* Verify the reply had the correct head */
if (((results[0] & ST0_HA) >> 2) != head) {
result_ok = 0;
}
/* Verify the reply had the correct drive */
if (((results[0] & ST0_DS) != FD_DRIVE)) {
result_ok = 0;
}
}
if (!result_ok) {
printk_debug("result_bytes = %d\n", nr);
printk_debug("ST0 = %02x\n", results[0]);
printk_debug("ST1 = %02x\n", results[1]);
printk_debug("ST2 = %02x\n", results[2]);
printk_debug(" C = %02x\n", results[3]);
printk_debug(" H = %02x\n", results[4]);
printk_debug(" R = %02x\n", results[5]);
printk_debug(" N = %02x\n", results[6]);
}
return result_ok;
}
static int floppy_read_sectors(
char *dest, unsigned byte_offset, unsigned length,
unsigned sector, unsigned head, unsigned track)
{
/* MT == Multitrack */
/* MFM == MFM or FM Mode */
/* SK == Skip deleted data addres Mark */
/* HDS == Head number select */
/* DS0 == Disk Drive Select 0 */
/* DS1 == Disk Drive Select 1 */
/* C == Cylinder number 0 - 255 */
/* H == Head number */
/* R == Record */
/* N == The number of data bytes written in a sector */
/* EOT == End of Track */
/* GPL == Gap Length */
/* DTL == Data Length */
/* MT MFM SK 0 1 1 0 0 */
/* 0 0 0 0 0 HDS DS1 DS0 */
/* C, H, R, N, EOT, GPL, DTL */
int i, status, result_ok;
int max_bytes, bytes_read;
int ret;
unsigned char cmd[9];
unsigned end_offset;
end_offset = byte_offset + length;
max_bytes = 512*(DISK_H1440_SECT - sector + 1);
if (byte_offset >= max_bytes) {
return 0;
}
cmd[0] = FD_READ | (((DISK_H1440_HEAD ==2)?1:0) << 6);
cmd[1] = (head << 2) | FD_DRIVE;
cmd[2] = track;
cmd[3] = head;
cmd[4] = sector;
cmd[5] = 2; /* 2^N *128 == Sector size. Hard coded to 512 bytes */
cmd[6] = DISK_H1440_SECT;
cmd[7] = DISK_H1440_GAP;
cmd[8] = 0xff;
/* Output the command bytes */
if (output_command(cmd, 9) < 0)
return -1;
/* The execution stage begins when STATUS_READY&STATUS_NON_DMA is set */
do {
status = fdc_state.fdc_inb(FD_STATUS);
status &= STATUS_READY | STATUS_NON_DMA;
} while(status != (STATUS_READY|STATUS_NON_DMA));
for(i = 0; i < max_bytes; i++) {
unsigned char byte;
if ((status = wait_til_ready()) < 0) {
break;
}
status &= STATUS_READY|STATUS_DIR|STATUS_NON_DMA;
if (status != (STATUS_READY|STATUS_DIR|STATUS_NON_DMA)) {
break;
}
byte = fdc_state.fdc_inb(FD_DATA);
if ((i >= byte_offset) && (i < end_offset)) {
dest[i - byte_offset] = byte;
}
}
bytes_read = i;
/* The result stage begins when STATUS_NON_DMA is cleared */
while((status = fdc_state.fdc_inb(FD_STATUS)) & STATUS_NON_DMA) {
/* We get extra bytes in the fifo past
* the end of the sector and drop them on the floor.
* Otherwise the fifo is polluted.
*/
fdc_state.fdc_inb(FD_DATA);
}
/* Did I get an error? */
result_ok = read_ok(head);
/* Did I read enough bytes? */
ret = -1;
if (result_ok && (bytes_read == max_bytes)) {
ret = bytes_read - byte_offset;
if (ret > length) {
ret = length;
}
}
if (ret < 0) {
printk_debug("ret = %d\n", ret);
printk_debug("bytes_read = %d\n", bytes_read);
printk_debug("status = %x\n", status);
}
return ret;
}
static int __floppy_read(char *dest, unsigned long offset, unsigned long length)
{
unsigned head, track, sector, byte_offset, sector_offset;
int ret;
/* break the offset up into sectors and bytes */
byte_offset = offset % 512;
sector_offset = offset / 512;
/* Find the disk block we are starting with... */
sector = (sector_offset % DISK_H1440_SECT) + 1;
head = (sector_offset / DISK_H1440_SECT) % DISK_H1440_HEAD;
track = (sector_offset / (DISK_H1440_SECT *DISK_H1440_HEAD))% DISK_H1440_TRACK;
/* First seek to our start track */
if (!floppy_seek(track)) {
return -1;
}
/* Then read the data */
ret = floppy_read_sectors(dest, byte_offset, length, sector, head, track);
if (ret >= 0) {
return ret;
}
/* If we failed reset the fdc... */
floppy_reset();
return -1;
}
static int floppy_read(char *dest, unsigned long offset, unsigned long length)
{
int fr_result, bytes_read;;
printk_debug("floppy_read\n");
bytes_read = 0;
do {
int max_errors = 3;
do {
fr_result = __floppy_read(dest + bytes_read, offset,
length - bytes_read);
if (max_errors-- == 0) {
return (bytes_read)?bytes_read: -1;
}
} while (fr_result <= 0);
offset += fr_result;
bytes_read += fr_result;
} while(bytes_read < length);
return bytes_read;
}
/* Determine the floppy disk controller type */
/* This routine was written by David C. Niemi */
static char get_fdc_version(void)
{
int bytes, ret;
unsigned char reply_buffer[MAX_REPLIES];
ret = output_byte(FD_DUMPREGS); /* 82072 and better know DUMPREGS */
if (ret < 0)
return FDC_NONE;
if ((bytes = result(reply_buffer, MAX_REPLIES)) <= 0x00)
return FDC_NONE; /* No FDC present ??? */
if ((bytes==1) && (reply_buffer[0] == 0x80)){
printk_info("FDC is an 8272A\n");
return FDC_8272A; /* 8272a/765 don't know DUMPREGS */
}
if (bytes != 10) {
printk_debug("init: DUMPREGS: unexpected return of %d bytes.\n",
bytes);
return FDC_UNKNOWN;
}
if (!fdc_configure(USE_IMPLIED_SEEK, USE_FIFO, FIFO_THRESHOLD,
TRACK_PRECOMPENSATION)) {
printk_info("FDC is an 82072\n");
return FDC_82072; /* 82072 doesn't know CONFIGURE */
}
output_byte(FD_PERPENDICULAR);
if (need_more_output() == MORE_OUTPUT) {
output_byte(0);
} else {
printk_info("FDC is an 82072A\n");
return FDC_82072A; /* 82072A as found on Sparcs. */
}
output_byte(FD_UNLOCK);
bytes = result(reply_buffer, MAX_REPLIES);
if ((bytes == 1) && (reply_buffer[0] == 0x80)){
printk_info("FDC is a pre-1991 82077\n");
return FDC_82077_ORIG; /* Pre-1991 82077, doesn't know
* LOCK/UNLOCK */
}
if ((bytes != 1) || (reply_buffer[0] != 0x00)) {
printk_debug("FDC init: UNLOCK: unexpected return of %d bytes.\n",
bytes);
return FDC_UNKNOWN;
}
output_byte(FD_PARTID);
bytes = result(reply_buffer, MAX_REPLIES);
if (bytes != 1) {
printk_debug("FDC init: PARTID: unexpected return of %d bytes.\n",
bytes);
return FDC_UNKNOWN;
}
if (reply_buffer[0] == 0x80) {
printk_info("FDC is a post-1991 82077\n");
return FDC_82077; /* Revised 82077AA passes all the tests */
}
switch (reply_buffer[0] >> 5) {
case 0x0:
/* Either a 82078-1 or a 82078SL running at 5Volt */
printk_info("FDC is an 82078.\n");
return FDC_82078;
case 0x1:
printk_info("FDC is a 44pin 82078\n");
return FDC_82078;
case 0x2:
printk_info("FDC is a S82078B\n");
return FDC_S82078B;
case 0x3:
printk_info("FDC is a National Semiconductor PC87306\n");
return FDC_87306;
default:
printk_info("FDC init: 82078 variant with unknown PARTID=%d.\n",
reply_buffer[0] >> 5);
return FDC_82078_UNKN;
}
} /* get_fdc_version */
static int floppy_init(unsigned long io_base, unsigned long mmio_base)
{
printk_debug("floppy_init\n");
fdc_state.in_sync = 0;
fdc_state.spec1 = -1;
fdc_state.spec2 = -1;
fdc_state.dtr = -1;
fdc_state.dor = DOR_NO_RESET;
fdc_state.version = FDC_UNKNOWN;
if (mmio_base) {
fdc_state.fdc_inb = ob_fdc_mmio_readb;
fdc_state.fdc_outb = ob_fdc_mmio_writeb;
} else {
fdc_state.fdc_inb = ob_fdc_inb;
fdc_state.fdc_outb = ob_fdc_outb;
}
fdc_state.io_base = io_base;
fdc_state.mmio_base = mmio_base;
reset_fdc();
/* Try to determine the floppy controller type */
fdc_state.version = get_fdc_version();
if (fdc_state.version == FDC_NONE) {
return -1;
}
floppy_reset();
printk_info("fdc_state.version = %04x\n", fdc_state.version);
return 0;
}
static void floppy_reset(void)
{
printk_debug("floppy_reset\n");
floppy_motor_off(FD_DRIVE);
reset_fdc();
fdc_dtr(DISK_H1440_RATE);
/* program data rate via ccr */
collect_interrupt();
fdc_configure(USE_IMPLIED_SEEK, USE_FIFO, FIFO_THRESHOLD,
TRACK_PRECOMPENSATION);
fdc_specify(DRIVE_H1440_HLT, DRIVE_H1440_HUT, DRIVE_H1440_SRT);
set_drive(FD_DRIVE);
floppy_recalibrate();
fdc_state.in_sync = 1;
}
static void
ob_floppy_open(int *idx)
{
int ret = 1;
phandle_t ph;
fword("my-unit");
idx[0]=POP();
fword("my-parent");
fword("ihandle>phandle");
ph=(phandle_t)POP();
selfword("open-deblocker");
/* interpose disk-label */
ph = find_dev("/packages/disk-label");
fword("my-args");
PUSH_ph( ph );
fword("interpose");
RET ( -ret );
}
static void
ob_floppy_close(int *idx)
{
selfword("close-deblocker");
}
static void
ob_floppy_read_blocks(int *idx)
{
cell cnt = POP();
ucell blk = POP();
char *dest = (char*)POP();
floppy_read(dest, blk*512, cnt*512);
PUSH(cnt);
}
static void
ob_floppy_block_size(int *idx)
{
PUSH(512);
}
static void
ob_floppy_max_transfer(int *idx)
{
// Fixme
PUSH(18 * 512);
}
NODE_METHODS(ob_floppy) = {
{ "open", ob_floppy_open },
{ "close", ob_floppy_close },
{ "read-blocks", ob_floppy_read_blocks },
{ "block-size", ob_floppy_block_size },
{ "max-transfer", ob_floppy_max_transfer },
};
int ob_floppy_init(const char *path, const char *dev_name,
unsigned long io_base, unsigned long mmio_base)
{
char nodebuff[128];
phandle_t aliases;
fword("new-device");
push_str(dev_name);
fword("device-name");
push_str("block");
fword("device-type");
if (!mmio_base) {
BIND_NODE_METHODS(get_cur_dev(), ob_floppy);
PUSH(0);
fword("encode-int");
PUSH(0);
fword("encode-int");
fword("encode+");
PUSH(0);
fword("encode-int");
fword("encode+");
push_str("reg");
fword("property");
fword("is-deblocker");
} else {
// Already in tree and mapped
BIND_NODE_METHODS(get_cur_dev(), ob_floppy);
}
floppy_init(io_base, mmio_base);
fword("finish-device");
aliases = find_dev("/aliases");
snprintf(nodebuff, sizeof(nodebuff), "%s/%s", path, dev_name);
set_property(aliases, "floppy", nodebuff, strlen(nodebuff) + 1);
return 0;
}
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