diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_labpc_isadma.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_labpc_isadma.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/drivers/staging/comedi/drivers/ni_labpc_isadma.c b/drivers/staging/comedi/drivers/ni_labpc_isadma.c deleted file mode 100644 index a551aca6e615..000000000000 --- a/drivers/staging/comedi/drivers/ni_labpc_isadma.c +++ /dev/null @@ -1,181 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * comedi/drivers/ni_labpc_isadma.c - * ISA DMA support for National Instruments Lab-PC series boards and - * compatibles. - * - * Extracted from ni_labpc.c: - * Copyright (C) 2001-2003 Frank Mori Hess <fmhess@users.sourceforge.net> - */ - -#include <linux/module.h> -#include <linux/slab.h> - -#include "../comedidev.h" - -#include "comedi_isadma.h" -#include "ni_labpc.h" -#include "ni_labpc_regs.h" -#include "ni_labpc_isadma.h" - -/* size in bytes of dma buffer */ -#define LABPC_ISADMA_BUFFER_SIZE 0xff00 - -/* utility function that suggests a dma transfer size in bytes */ -static unsigned int labpc_suggest_transfer_size(struct comedi_device *dev, - struct comedi_subdevice *s, - unsigned int maxbytes) -{ - struct comedi_cmd *cmd = &s->async->cmd; - unsigned int sample_size = comedi_bytes_per_sample(s); - unsigned int size; - unsigned int freq; - - if (cmd->convert_src == TRIG_TIMER) - freq = 1000000000 / cmd->convert_arg; - else - /* return some default value */ - freq = 0xffffffff; - - /* make buffer fill in no more than 1/3 second */ - size = (freq / 3) * sample_size; - - /* set a minimum and maximum size allowed */ - if (size > maxbytes) - size = maxbytes; - else if (size < sample_size) - size = sample_size; - - return size; -} - -void labpc_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s) -{ - struct labpc_private *devpriv = dev->private; - struct comedi_isadma_desc *desc = &devpriv->dma->desc[0]; - struct comedi_cmd *cmd = &s->async->cmd; - unsigned int sample_size = comedi_bytes_per_sample(s); - - /* set appropriate size of transfer */ - desc->size = labpc_suggest_transfer_size(dev, s, desc->maxsize); - if (cmd->stop_src == TRIG_COUNT && - devpriv->count * sample_size < desc->size) - desc->size = devpriv->count * sample_size; - - comedi_isadma_program(desc); - - /* set CMD3 bits for caller to enable DMA and interrupt */ - devpriv->cmd3 |= (CMD3_DMAEN | CMD3_DMATCINTEN); -} -EXPORT_SYMBOL_GPL(labpc_setup_dma); - -void labpc_drain_dma(struct comedi_device *dev) -{ - struct labpc_private *devpriv = dev->private; - struct comedi_isadma_desc *desc = &devpriv->dma->desc[0]; - struct comedi_subdevice *s = dev->read_subdev; - struct comedi_async *async = s->async; - struct comedi_cmd *cmd = &async->cmd; - unsigned int max_samples = comedi_bytes_to_samples(s, desc->size); - unsigned int residue; - unsigned int nsamples; - unsigned int leftover; - - /* - * residue is the number of bytes left to be done on the dma - * transfer. It should always be zero at this point unless - * the stop_src is set to external triggering. - */ - residue = comedi_isadma_disable(desc->chan); - - /* - * Figure out how many samples to read for this transfer and - * how many will be stored for next time. - */ - nsamples = max_samples - comedi_bytes_to_samples(s, residue); - if (cmd->stop_src == TRIG_COUNT) { - if (devpriv->count <= nsamples) { - nsamples = devpriv->count; - leftover = 0; - } else { - leftover = devpriv->count - nsamples; - if (leftover > max_samples) - leftover = max_samples; - } - devpriv->count -= nsamples; - } else { - leftover = max_samples; - } - desc->size = comedi_samples_to_bytes(s, leftover); - - comedi_buf_write_samples(s, desc->virt_addr, nsamples); -} -EXPORT_SYMBOL_GPL(labpc_drain_dma); - -static void handle_isa_dma(struct comedi_device *dev) -{ - struct labpc_private *devpriv = dev->private; - struct comedi_isadma_desc *desc = &devpriv->dma->desc[0]; - - labpc_drain_dma(dev); - - if (desc->size) - comedi_isadma_program(desc); - - /* clear dma tc interrupt */ - devpriv->write_byte(dev, 0x1, DMATC_CLEAR_REG); -} - -void labpc_handle_dma_status(struct comedi_device *dev) -{ - const struct labpc_boardinfo *board = dev->board_ptr; - struct labpc_private *devpriv = dev->private; - - /* - * if a dma terminal count of external stop trigger - * has occurred - */ - if (devpriv->stat1 & STAT1_GATA0 || - (board->is_labpc1200 && devpriv->stat2 & STAT2_OUTA1)) - handle_isa_dma(dev); -} -EXPORT_SYMBOL_GPL(labpc_handle_dma_status); - -void labpc_init_dma_chan(struct comedi_device *dev, unsigned int dma_chan) -{ - struct labpc_private *devpriv = dev->private; - - /* only DMA channels 3 and 1 are valid */ - if (dma_chan != 1 && dma_chan != 3) - return; - - /* DMA uses 1 buffer */ - devpriv->dma = comedi_isadma_alloc(dev, 1, dma_chan, dma_chan, - LABPC_ISADMA_BUFFER_SIZE, - COMEDI_ISADMA_READ); -} -EXPORT_SYMBOL_GPL(labpc_init_dma_chan); - -void labpc_free_dma_chan(struct comedi_device *dev) -{ - struct labpc_private *devpriv = dev->private; - - if (devpriv) - comedi_isadma_free(devpriv->dma); -} -EXPORT_SYMBOL_GPL(labpc_free_dma_chan); - -static int __init ni_labpc_isadma_init_module(void) -{ - return 0; -} -module_init(ni_labpc_isadma_init_module); - -static void __exit ni_labpc_isadma_cleanup_module(void) -{ -} -module_exit(ni_labpc_isadma_cleanup_module); - -MODULE_AUTHOR("Comedi https://www.comedi.org"); -MODULE_DESCRIPTION("Comedi NI Lab-PC ISA DMA support"); -MODULE_LICENSE("GPL"); |