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author | blueswir1 <blueswir1@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-04-29 16:16:30 +0000 |
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committer | blueswir1 <blueswir1@c046a42c-6fe2-441c-8c8c-71466251a162> | 2008-04-29 16:16:30 +0000 |
commit | b9b3d225163a07978d649af0bb560eacacf61b1a (patch) | |
tree | a473e30e7101cfc86073f952512654f33ab90159 /hw/fdc.c | |
parent | 1c346df2a2992339609338d900bc919cf152ed85 (diff) | |
download | qemu-b9b3d225163a07978d649af0bb560eacacf61b1a.zip qemu-b9b3d225163a07978d649af0bb560eacacf61b1a.tar.gz qemu-b9b3d225163a07978d649af0bb560eacacf61b1a.tar.bz2 |
FDC fix 6/10 (Hervé Poussineau):
- Stores controller state in MSR register instead of internal state field. This simplifies the fdctrl_read_main_status() function, which may be called in some tight loops.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4286 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'hw/fdc.c')
-rw-r--r-- | hw/fdc.c | 83 |
1 files changed, 32 insertions, 51 deletions
@@ -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++) { |