staging: comedi: das1800: remove depends on ISA_DMA_API limitation
Use the new comedi_isadma module to provide the ISA DMA support. This removes all the ISA_DMA_API code from this driver and allows the driver to be used on platforms that don't support the ISA_DMA_API. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten
Greg Kroah-Hartman
Родитель
1400964a2b
Коммит
99dfc3357e
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@ -309,7 +309,7 @@ config COMEDI_DAS800
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config COMEDI_DAS1800
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tristate "DAS1800 and compatible ISA card support"
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depends on ISA_DMA_API
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select COMEDI_ISADMA if ISA_DMA_API
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---help---
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Enable support for DAS1800 and compatible ISA cards
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Keithley Metrabyte DAS-1701ST, DAS-1701ST-DA, DAS-1701/AO,
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@ -98,12 +98,12 @@ TODO:
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include "../comedidev.h"
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#include <asm/dma.h>
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#include "8253.h"
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#include "comedi_isadma.h"
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#include "comedi_fc.h"
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#include "8253.h"
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/* misc. defines */
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#define DAS1800_SIZE 16 /* uses 16 io addresses */
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@ -420,22 +420,14 @@ static const struct das1800_board das1800_boards[] = {
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},
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};
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struct das1800_dma_desc {
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unsigned int chan; /* DMA channel */
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void *virt_addr; /* virtual address of DMA buffer */
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dma_addr_t hw_addr; /* hardware (bus) address of DMA buffer */
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unsigned int size; /* transfer size (in bytes) */
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};
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struct das1800_private {
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struct comedi_isadma *dma;
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unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
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unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
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int irq_dma_bits; /* bits for control register b */
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/* dma bits for control register b, stored so that dma can be
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* turned on and off */
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int dma_bits;
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struct das1800_dma_desc dma_desc[2];
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int cur_dma;
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uint16_t *fifo_buf; /* bounce buffer for analog input FIFO */
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unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
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unsigned short ao_update_bits; /* remembers the last write to the
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@ -452,32 +444,6 @@ static const struct comedi_lrange range_ao_2 = {
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};
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*/
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static void das1800_isadma_program(struct das1800_dma_desc *dma)
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{
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unsigned long flags;
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flags = claim_dma_lock();
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clear_dma_ff(dma->chan);
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set_dma_mode(dma->chan, DMA_MODE_READ);
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set_dma_addr(dma->chan, dma->hw_addr);
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set_dma_count(dma->chan, dma->size);
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enable_dma(dma->chan);
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release_dma_lock(flags);
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}
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static unsigned int das1800_isadma_disable(unsigned int dma_chan)
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{
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unsigned long flags;
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unsigned int residue;
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flags = claim_dma_lock();
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disable_dma(dma_chan);
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residue = get_dma_residue(dma_chan);
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release_dma_lock(flags);
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return residue;
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}
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static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
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uint16_t sample)
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{
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@ -540,18 +506,18 @@ static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
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/* Utility function used by das1800_flush_dma() and das1800_handle_dma() */
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static void das1800_flush_dma_channel(struct comedi_device *dev,
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struct comedi_subdevice *s,
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struct das1800_dma_desc *dma)
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struct comedi_isadma_desc *desc)
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{
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unsigned int residue = das1800_isadma_disable(dma->chan);
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unsigned int nbytes = dma->size - residue;
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unsigned int residue = comedi_isadma_disable(desc->chan);
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unsigned int nbytes = desc->size - residue;
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unsigned int nsamples;
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/* figure out how many points to read */
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nsamples = comedi_bytes_to_samples(s, nbytes);
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nsamples = comedi_nsamples_left(s, nsamples);
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munge_data(dev, dma->virt_addr, nsamples);
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comedi_buf_write_samples(s, dma->virt_addr, nsamples);
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munge_data(dev, desc->virt_addr, nsamples);
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comedi_buf_write_samples(s, desc->virt_addr, nsamples);
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}
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/* flushes remaining data from board when external trigger has stopped acquisition
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@ -560,16 +526,17 @@ static void das1800_flush_dma(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct das1800_private *devpriv = dev->private;
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struct das1800_dma_desc *dma = &devpriv->dma_desc[devpriv->cur_dma];
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
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const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
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das1800_flush_dma_channel(dev, s, dma);
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das1800_flush_dma_channel(dev, s, desc);
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if (dual_dma) {
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/* switch to other channel and flush it */
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devpriv->cur_dma = 1 - devpriv->cur_dma;
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dma = &devpriv->dma_desc[devpriv->cur_dma];
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das1800_flush_dma_channel(dev, s, dma);
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dma->cur_dma = 1 - dma->cur_dma;
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desc = &dma->desc[dma->cur_dma];
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das1800_flush_dma_channel(dev, s, desc);
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}
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/* get any remaining samples in fifo */
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@ -580,27 +547,29 @@ static void das1800_handle_dma(struct comedi_device *dev,
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struct comedi_subdevice *s, unsigned int status)
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{
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struct das1800_private *devpriv = dev->private;
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struct das1800_dma_desc *dma = &devpriv->dma_desc[devpriv->cur_dma];
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
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const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
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das1800_flush_dma_channel(dev, s, dma);
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das1800_flush_dma_channel(dev, s, desc);
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/* re-enable dma channel */
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das1800_isadma_program(dma);
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comedi_isadma_program(desc);
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if (status & DMATC) {
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/* clear DMATC interrupt bit */
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outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
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/* switch dma channels for next time, if appropriate */
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if (dual_dma)
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devpriv->cur_dma = 1 - devpriv->cur_dma;
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dma->cur_dma = 1 - dma->cur_dma;
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}
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}
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static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
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{
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struct das1800_private *devpriv = dev->private;
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struct das1800_dma_desc *dma;
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc;
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int i;
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outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
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@ -608,9 +577,9 @@ static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
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outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
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for (i = 0; i < 2; i++) {
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dma = &devpriv->dma_desc[i];
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if (dma->chan)
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das1800_isadma_disable(dma->chan);
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desc = &dma->desc[i];
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if (desc->chan)
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comedi_isadma_disable(desc->chan);
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}
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return 0;
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@ -968,10 +937,11 @@ static void das1800_setup_counters(struct comedi_device *dev,
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static unsigned int das1800_ai_transfer_size(struct comedi_device *dev,
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struct comedi_subdevice *s,
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unsigned int maxbytes,
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unsigned int ns)
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{
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struct comedi_cmd *cmd = &s->async->cmd;
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unsigned int max_samples = comedi_bytes_to_samples(s, DMA_BUF_SIZE);
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unsigned int max_samples = comedi_bytes_to_samples(s, maxbytes);
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unsigned int samples;
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samples = max_samples;
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@ -1002,25 +972,26 @@ static void das1800_ai_setup_dma(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct das1800_private *devpriv = dev->private;
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struct das1800_dma_desc *dma = &devpriv->dma_desc[0];
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc = &dma->desc[0];
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unsigned int bytes;
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if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
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return;
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devpriv->cur_dma = 0;
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dma->cur_dma = 0;
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/* determine a dma transfer size to fill buffer in 0.3 sec */
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bytes = das1800_ai_transfer_size(dev, s, 300000000);
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bytes = das1800_ai_transfer_size(dev, s, desc->maxsize, 300000000);
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dma->size = bytes;
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das1800_isadma_program(dma);
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desc->size = bytes;
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comedi_isadma_program(desc);
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/* set up dual dma if appropriate */
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if (devpriv->irq_dma_bits & DMA_DUAL) {
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dma = &devpriv->dma_desc[1];
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dma->size = bytes;
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das1800_isadma_program(dma);
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desc = &dma->desc[1];
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desc->size = bytes;
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comedi_isadma_program(desc);
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}
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}
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@ -1220,13 +1191,11 @@ static int das1800_do_wbits(struct comedi_device *dev,
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return insn->n;
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}
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static int das1800_init_dma(struct comedi_device *dev,
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struct comedi_devconfig *it)
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static void das1800_init_dma(struct comedi_device *dev,
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struct comedi_devconfig *it)
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{
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struct das1800_private *devpriv = dev->private;
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struct das1800_dma_desc *dma;
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unsigned int *dma_chan;
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int i;
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/*
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* it->options[2] is DMA channel 0
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@ -1238,75 +1207,41 @@ static int das1800_init_dma(struct comedi_device *dev,
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switch ((dma_chan[0] & 0x7) | (dma_chan[1] << 4)) {
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case 0x5: /* dma0 == 5 */
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devpriv->dma_bits |= DMA_CH5;
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devpriv->dma_bits = DMA_CH5;
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break;
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case 0x6: /* dma0 == 6 */
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devpriv->dma_bits |= DMA_CH6;
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devpriv->dma_bits = DMA_CH6;
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break;
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case 0x7: /* dma0 == 7 */
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devpriv->dma_bits |= DMA_CH7;
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devpriv->dma_bits = DMA_CH7;
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break;
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case 0x65: /* dma0 == 5, dma1 == 6 */
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devpriv->dma_bits |= DMA_CH5_CH6;
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devpriv->dma_bits = DMA_CH5_CH6;
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break;
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case 0x76: /* dma0 == 6, dma1 == 7 */
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devpriv->dma_bits |= DMA_CH6_CH7;
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devpriv->dma_bits = DMA_CH6_CH7;
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break;
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case 0x57: /* dma0 == 7, dma1 == 5 */
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devpriv->dma_bits |= DMA_CH7_CH5;
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devpriv->dma_bits = DMA_CH7_CH5;
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break;
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default:
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dev_err(dev->class_dev,
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"only supports dma channels 5 through 7\n");
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dev_err(dev->class_dev,
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"Dual dma only allows the following combinations:\n");
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dev_err(dev->class_dev,
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"dma 5,6 / 6,7 / or 7,5\n");
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return -EINVAL;
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return;
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}
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for (i = 0; i < 2; i++) {
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dma = &devpriv->dma_desc[i];
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if (dma_chan[i] == 0)
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break;
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if (request_dma(dma_chan[i], dev->board_name)) {
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dev_err(dev->class_dev,
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"failed to allocate dma channel %i\n",
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dma_chan[i]);
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return -EINVAL;
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}
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dma->chan = dma_chan[i];
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dma->virt_addr = dma_alloc_coherent(NULL, DMA_BUF_SIZE,
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&dma->hw_addr, GFP_KERNEL);
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if (!dma->virt_addr)
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return -ENOMEM;
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das1800_isadma_disable(dma->chan);
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}
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return 0;
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/* DMA can use 1 or 2 buffers, each with a separate channel */
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devpriv->dma = comedi_isadma_alloc(dev, dma_chan[1] ? 2 : 1,
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dma_chan[0], dma_chan[1],
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DMA_BUF_SIZE, COMEDI_ISADMA_READ);
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if (!devpriv->dma)
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devpriv->dma_bits = 0;
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}
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static void das1800_free_dma(struct comedi_device *dev)
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{
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struct das1800_private *devpriv = dev->private;
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struct das1800_dma_desc *dma;
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int i;
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if (!devpriv)
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return;
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for (i = 0; i < 2; i++) {
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dma = &devpriv->dma_desc[i];
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if (dma->chan)
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free_dma(dma->chan);
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if (dma->virt_addr)
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dma_free_coherent(NULL, DMA_BUF_SIZE,
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dma->virt_addr, dma->hw_addr);
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}
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if (devpriv)
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comedi_isadma_free(devpriv->dma);
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}
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static int das1800_probe(struct comedi_device *dev)
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@ -1436,11 +1371,8 @@ static int das1800_attach(struct comedi_device *dev,
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}
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/* an irq and one dma channel is required to use dma */
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if (dev->irq & it->options[2]) {
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ret = das1800_init_dma(dev, it);
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if (ret < 0)
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return ret;
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}
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if (dev->irq & it->options[2])
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das1800_init_dma(dev, it);
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devpriv->fifo_buf = kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
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if (!devpriv->fifo_buf)
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