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-rw-r--r--hw/fdc.c83
1 files changed, 32 insertions, 51 deletions
diff --git a/hw/fdc.c b/hw/fdc.c
index cf8527def5..54dc40b9f1 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -312,12 +312,6 @@ static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value);
static uint32_t fdctrl_read_dir (fdctrl_t *fdctrl);
enum {
- FD_CTRL_ACTIVE = 0x01, /* XXX: suppress that */
- FD_CTRL_SLEEP = 0x04, /* XXX: suppress that */
- FD_CTRL_BUSY = 0x08, /* dma transfer in progress */
-};
-
-enum {
FD_DIR_WRITE = 0,
FD_DIR_READ = 1,
FD_DIR_SCANE = 2,
@@ -326,13 +320,9 @@ enum {
};
enum {
- FD_STATE_CMD = 0x00,
- FD_STATE_STATUS = 0x01,
- FD_STATE_DATA = 0x02,
- FD_STATE_STATE = 0x03,
- FD_STATE_MULTI = 0x10,
- FD_STATE_SEEK = 0x20,
- FD_STATE_FORMAT = 0x40,
+ FD_STATE_MULTI = 0x01, /* multi track flag */
+ FD_STATE_FORMAT = 0x02, /* format flag */
+ FD_STATE_SEEK = 0x04, /* seek flag */
};
enum {
@@ -450,9 +440,6 @@ enum {
FD_DIR_DSKCHG = 0x80,
};
-#define FD_STATE(state) ((state) & FD_STATE_STATE)
-#define FD_SET_STATE(state, new_state) \
-do { (state) = ((state) & ~FD_STATE_STATE) | (new_state); } while (0)
#define FD_MULTI_TRACK(state) ((state) & FD_STATE_MULTI)
#define FD_DID_SEEK(state) ((state) & FD_STATE_SEEK)
#define FD_FORMAT_CMD(state) ((state) & FD_STATE_FORMAT)
@@ -470,6 +457,7 @@ struct fdctrl_t {
uint8_t sra;
uint8_t srb;
uint8_t dor;
+ uint8_t dsr;
uint8_t msr;
uint8_t state;
uint8_t dma_en;
@@ -713,9 +701,11 @@ static void fdctrl_reset_irq (fdctrl_t *fdctrl)
static void fdctrl_raise_irq (fdctrl_t *fdctrl, uint8_t status)
{
- // Sparc mutation
- if (fdctrl->sun4m && !fdctrl->dma_en) {
- fdctrl->state &= ~FD_CTRL_BUSY;
+ /* Sparc mutation */
+ if (fdctrl->sun4m && (fdctrl->msr & FD_MSR_CMDBUSY)) {
+ /* XXX: not sure */
+ fdctrl->msr &= ~FD_MSR_CMDBUSY;
+ fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
fdctrl->int_status = status;
return;
}
@@ -742,11 +732,11 @@ static void fdctrl_reset (fdctrl_t *fdctrl, int do_irq)
fdctrl->cur_drv = 0;
fdctrl->dor = FD_DOR_nRESET;
fdctrl->dor |= (fdctrl->dma_chann != -1) ? FD_DOR_DMAEN : 0;
- fdctrl->msr = 0;
+ fdctrl->msr = FD_MSR_RQM;
/* FIFO state */
fdctrl->data_pos = 0;
fdctrl->data_len = 0;
- fdctrl->data_state = FD_STATE_CMD;
+ fdctrl->data_state = 0;
fdctrl->data_dir = FD_DIR_WRITE;
for (i = 0; i < MAX_FD; i++)
fd_recalibrate(&fdctrl->drives[i]);
@@ -831,7 +821,7 @@ static void fdctrl_write_dor (fdctrl_t *fdctrl, uint32_t value)
if (!(fdctrl->dor & FD_DOR_nRESET)) {
FLOPPY_DPRINTF("controller out of RESET state\n");
fdctrl_reset(fdctrl, 1);
- fdctrl->state &= ~FD_CTRL_SLEEP;
+ fdctrl->dsr &= ~FD_DSR_PWRDOWN;
}
}
/* Selected drive */
@@ -869,22 +859,11 @@ static void fdctrl_write_tape (fdctrl_t *fdctrl, uint32_t value)
/* Main status register : 0x04 (read) */
static uint32_t fdctrl_read_main_status (fdctrl_t *fdctrl)
{
- uint32_t retval = 0;
+ uint32_t retval = fdctrl->msr;
+ fdctrl->dsr &= ~FD_DSR_PWRDOWN;
fdctrl->dor |= FD_DOR_nRESET;
- fdctrl->state &= ~FD_CTRL_SLEEP;
- if (!(fdctrl->state & FD_CTRL_BUSY)) {
- /* Data transfer allowed */
- retval |= FD_MSR_RQM;
- /* Data transfer direction indicator */
- if (fdctrl->data_dir == FD_DIR_READ)
- retval |= FD_MSR_DIO;
- }
- /* Should handle FD_MSR_NONDMA for SPECIFY command */
- /* Command busy indicator */
- if (FD_STATE(fdctrl->data_state) == FD_STATE_DATA ||
- FD_STATE(fdctrl->data_state) == FD_STATE_STATUS)
- retval |= FD_MSR_CMDBUSY;
+
FLOPPY_DPRINTF("main status register: 0x%02x\n", retval);
return retval;
@@ -906,9 +885,9 @@ static void fdctrl_write_rate (fdctrl_t *fdctrl, uint32_t value)
fdctrl->dor |= FD_DOR_nRESET;
}
if (value & FD_DSR_PWRDOWN) {
- fdctrl->state |= FD_CTRL_SLEEP;
fdctrl_reset(fdctrl, 1);
}
+ fdctrl->dsr = value;
}
static int fdctrl_media_changed(fdrive_t *drv)
@@ -943,7 +922,7 @@ static void fdctrl_reset_fifo (fdctrl_t *fdctrl)
{
fdctrl->data_dir = FD_DIR_WRITE;
fdctrl->data_pos = 0;
- FD_SET_STATE(fdctrl->data_state, FD_STATE_CMD);
+ fdctrl->msr &= ~(FD_MSR_CMDBUSY | FD_MSR_DIO);
}
/* Set FIFO status for the host to read */
@@ -952,7 +931,7 @@ static void fdctrl_set_fifo (fdctrl_t *fdctrl, int fifo_len, int do_irq)
fdctrl->data_dir = FD_DIR_READ;
fdctrl->data_len = fifo_len;
fdctrl->data_pos = 0;
- FD_SET_STATE(fdctrl->data_state, FD_STATE_STATUS);
+ fdctrl->msr |= FD_MSR_CMDBUSY | FD_MSR_RQM | FD_MSR_DIO;
if (do_irq)
fdctrl_raise_irq(fdctrl, 0x00);
}
@@ -1029,8 +1008,8 @@ static void fdctrl_stop_transfer (fdctrl_t *fdctrl, uint8_t status0,
fdctrl->data_dir = FD_DIR_READ;
if (!(fdctrl->msr & FD_MSR_NONDMA)) {
DMA_release_DREQ(fdctrl->dma_chann);
- fdctrl->state &= ~FD_CTRL_BUSY;
}
+ fdctrl->msr |= FD_MSR_RQM | FD_MSR_DIO;
fdctrl->msr &= ~FD_MSR_NONDMA;
fdctrl_set_fifo(fdctrl, 7, 1);
}
@@ -1079,10 +1058,11 @@ static void fdctrl_start_transfer (fdctrl_t *fdctrl, int direction)
default:
break;
}
+
/* Set the FIFO state */
fdctrl->data_dir = direction;
fdctrl->data_pos = 0;
- FD_SET_STATE(fdctrl->data_state, FD_STATE_DATA); /* FIFO ready for data */
+ fdctrl->msr |= FD_MSR_CMDBUSY;
if (fdctrl->fifo[0] & 0x80)
fdctrl->data_state |= FD_STATE_MULTI;
else
@@ -1116,7 +1096,7 @@ static void fdctrl_start_transfer (fdctrl_t *fdctrl, int direction)
(direction == FD_DIR_WRITE && dma_mode == 2) ||
(direction == FD_DIR_READ && dma_mode == 1)) {
/* No access is allowed until DMA transfer has completed */
- fdctrl->state |= FD_CTRL_BUSY;
+ fdctrl->msr &= ~FD_MSR_RQM;
/* Now, we just have to wait for the DMA controller to
* recall us...
*/
@@ -1129,6 +1109,8 @@ static void fdctrl_start_transfer (fdctrl_t *fdctrl, int direction)
}
FLOPPY_DPRINTF("start non-DMA transfer\n");
fdctrl->msr |= FD_MSR_NONDMA;
+ if (direction != FD_DIR_WRITE)
+ fdctrl->msr |= FD_MSR_DIO;
/* IO based transfer: calculate len */
fdctrl_raise_irq(fdctrl, 0x00);
@@ -1154,7 +1136,7 @@ static int fdctrl_transfer_handler (void *opaque, int nchan,
uint8_t status0 = 0x00, status1 = 0x00, status2 = 0x00;
fdctrl = opaque;
- if (!(fdctrl->state & FD_CTRL_BUSY)) {
+ if (fdctrl->msr & FD_MSR_RQM) {
FLOPPY_DPRINTF("Not in DMA transfer mode !\n");
return 0;
}
@@ -1263,9 +1245,9 @@ static uint32_t fdctrl_read_data (fdctrl_t *fdctrl)
int pos;
cur_drv = get_cur_drv(fdctrl);
- fdctrl->state &= ~FD_CTRL_SLEEP;
- if (FD_STATE(fdctrl->data_state) == FD_STATE_CMD) {
- FLOPPY_ERROR("can't read data in CMD state\n");
+ fdctrl->dsr &= ~FD_DSR_PWRDOWN;
+ if (!(fdctrl->msr & FD_MSR_RQM) || !(fdctrl->msr & FD_MSR_DIO)) {
+ FLOPPY_ERROR("controller not ready for reading\n");
return 0;
}
pos = fdctrl->data_pos;
@@ -1708,11 +1690,11 @@ static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value)
FLOPPY_DPRINTF("Floppy controller in RESET state !\n");
return;
}
- fdctrl->state &= ~FD_CTRL_SLEEP;
- if (FD_STATE(fdctrl->data_state) == FD_STATE_STATUS) {
- FLOPPY_ERROR("can't write data in status mode\n");
+ if (!(fdctrl->msr & FD_MSR_RQM) || (fdctrl->msr & FD_MSR_DIO)) {
+ FLOPPY_ERROR("controller not ready for writing\n");
return;
}
+ fdctrl->dsr &= ~FD_DSR_PWRDOWN;
/* Is it write command time ? */
if (fdctrl->msr & FD_MSR_NONDMA) {
/* FIFO data write */
@@ -1729,7 +1711,7 @@ static void fdctrl_write_data (fdctrl_t *fdctrl, uint32_t value)
/* Switch from transfer mode to status mode
* then from status mode to command mode
*/
- if (FD_STATE(fdctrl->data_state) == FD_STATE_DATA)
+ if (fdctrl->data_pos == fdctrl->data_len)
fdctrl_stop_transfer(fdctrl, FD_SR0_SEEK, 0x00, 0x00);
return;
}
@@ -1812,7 +1794,6 @@ static fdctrl_t *fdctrl_init_common (qemu_irq irq, int dma_chann,
fd_init(&fdctrl->drives[i], fds[i]);
}
fdctrl_reset(fdctrl, 0);
- fdctrl->state = FD_CTRL_ACTIVE;
register_savevm("fdc", io_base, 1, fdc_save, fdc_load, fdctrl);
qemu_register_reset(fdctrl_external_reset, fdctrl);
for (i = 0; i < MAX_FD; i++) {
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-02 10:51:04 +0000