staging: comedi: dt282x: 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
99dfc3357e
Коммит
860f7c0919
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@ -372,7 +372,7 @@ config COMEDI_DT2817
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config COMEDI_DT282X
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tristate "Data Translation DT2821 series and DT-EZ 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 Data Translation DT2821 series including DT-EZ
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DT2821, DT2821-F-16SE, DT2821-F-8DI, DT2821-G-16SE, DT2821-G-8DI,
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@ -56,15 +56,14 @@
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*/
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#include <linux/module.h>
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#include "../comedidev.h"
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#include <linux/delay.h>
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#include <linux/gfp.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <asm/dma.h>
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#include "../comedidev.h"
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#include "comedi_isadma.h"
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#include "comedi_fc.h"
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/*
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@ -300,72 +299,37 @@ static const struct dt282x_board boardtypes[] = {
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},
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};
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struct dt282x_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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char mode; /* DMA_MODE_* */
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};
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struct dt282x_private {
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struct comedi_isadma *dma;
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unsigned int ad_2scomp:1;
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unsigned int divisor;
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int dacsr; /* software copies of registers */
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int adcsr;
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int supcsr;
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int ntrig;
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int nread;
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struct dt282x_dma_desc dma_desc[2];
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int dma_maxsize; /* max size of DMA transfer (in bytes) */
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int cur_dma;
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int dma_dir;
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};
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static void dt282x_isadma_program(struct dt282x_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);
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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 void dt282x_isadma_disable(struct dt282x_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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disable_dma(dma->chan);
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release_dma_lock(flags);
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}
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static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
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{
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struct dt282x_private *devpriv = dev->private;
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struct dt282x_dma_desc *dma = &devpriv->dma_desc[dma_index];
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc = &dma->desc[dma_index];
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if (!devpriv->ntrig)
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return 0;
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if (n == 0)
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n = devpriv->dma_maxsize;
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n = desc->maxsize;
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if (n > devpriv->ntrig * 2)
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n = devpriv->ntrig * 2;
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devpriv->ntrig -= n / 2;
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dma->size = n;
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dma->mode = DMA_MODE_READ;
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desc->size = n;
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comedi_isadma_set_mode(desc, devpriv->dma_dir);
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dt282x_isadma_program(dma);
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comedi_isadma_program(desc);
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return n;
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}
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@ -373,12 +337,13 @@ static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n)
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static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
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{
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struct dt282x_private *devpriv = dev->private;
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struct dt282x_dma_desc *dma = &devpriv->dma_desc[dma_index];
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc = &dma->desc[dma_index];
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dma->size = n;
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dma->mode = DMA_MODE_WRITE;
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desc->size = n;
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comedi_isadma_set_mode(desc, devpriv->dma_dir);
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dt282x_isadma_program(dma);
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comedi_isadma_program(desc);
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return n;
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}
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@ -386,10 +351,14 @@ static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n)
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static void dt282x_disable_dma(struct comedi_device *dev)
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{
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struct dt282x_private *devpriv = dev->private;
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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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for (i = 0; i < 2; i++)
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dt282x_isadma_disable(&devpriv->dma_desc[i]);
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for (i = 0; i < 2; i++) {
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desc = &dma->desc[i];
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comedi_isadma_disable(desc->chan);
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}
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}
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static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags)
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@ -451,11 +420,12 @@ static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev,
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int cur_dma)
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{
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struct dt282x_private *devpriv = dev->private;
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struct dt282x_dma_desc *dma = &devpriv->dma_desc[cur_dma];
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unsigned int nsamples = comedi_bytes_to_samples(s, devpriv->dma_maxsize);
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc = &dma->desc[cur_dma];
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unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize);
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unsigned int nbytes;
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nbytes = comedi_buf_read_samples(s, dma->virt_addr, nsamples);
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nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples);
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if (nbytes)
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dt282x_prep_ao_dma(dev, cur_dma, nbytes);
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else
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@ -468,35 +438,37 @@ static void dt282x_ao_dma_interrupt(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct dt282x_private *devpriv = dev->private;
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struct dt282x_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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outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
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dev->iobase + DT2821_SUPCSR_REG);
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dt282x_isadma_disable(dma);
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comedi_isadma_disable(desc->chan);
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if (!dt282x_ao_setup_dma(dev, s, devpriv->cur_dma))
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if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma))
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s->async->events |= COMEDI_CB_OVERFLOW;
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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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static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct dt282x_private *devpriv = dev->private;
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struct dt282x_dma_desc *dma = &devpriv->dma_desc[devpriv->cur_dma];
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unsigned int nsamples = comedi_bytes_to_samples(s, dma->size);
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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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unsigned int nsamples = comedi_bytes_to_samples(s, desc->size);
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int ret;
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outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE,
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dev->iobase + DT2821_SUPCSR_REG);
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dt282x_isadma_disable(dma);
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comedi_isadma_disable(desc->chan);
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dt282x_munge(dev, s, dma->virt_addr, dma->size);
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ret = comedi_buf_write_samples(s, dma->virt_addr, nsamples);
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if (ret != dma->size)
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dt282x_munge(dev, s, desc->virt_addr, desc->size);
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ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples);
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if (ret != desc->size)
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return;
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devpriv->nread -= nsamples;
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@ -517,9 +489,9 @@ static void dt282x_ai_dma_interrupt(struct comedi_device *dev,
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}
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#endif
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/* restart the channel */
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dt282x_prep_ai_dma(dev, devpriv->cur_dma, 0);
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dt282x_prep_ai_dma(dev, dma->cur_dma, 0);
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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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static irqreturn_t dt282x_interrupt(int irq, void *d)
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@ -540,7 +512,7 @@ static irqreturn_t dt282x_interrupt(int irq, void *d)
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dacsr = inw(dev->iobase + DT2821_DACSR_REG);
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supcsr = inw(dev->iobase + DT2821_SUPCSR_REG);
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if (supcsr & DT2821_SUPCSR_DMAD) {
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if (devpriv->dma_dir == DMA_MODE_READ)
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if (devpriv->dma_dir == COMEDI_ISADMA_READ)
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dt282x_ai_dma_interrupt(dev, s);
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else
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dt282x_ao_dma_interrupt(dev, s_ao);
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@ -752,6 +724,7 @@ static int dt282x_ai_cmdtest(struct comedi_device *dev,
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static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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{
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struct dt282x_private *devpriv = dev->private;
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_cmd *cmd = &s->async->cmd;
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int ret;
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@ -773,8 +746,8 @@ static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
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devpriv->nread = devpriv->ntrig;
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devpriv->dma_dir = DMA_MODE_READ;
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devpriv->cur_dma = 0;
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devpriv->dma_dir = COMEDI_ISADMA_READ;
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dma->cur_dma = 0;
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dt282x_prep_ai_dma(dev, 0, 0);
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if (devpriv->ntrig) {
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dt282x_prep_ai_dma(dev, 1, 0);
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@ -937,6 +910,7 @@ static int dt282x_ao_inttrig(struct comedi_device *dev,
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static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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{
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struct dt282x_private *devpriv = dev->private;
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_cmd *cmd = &s->async->cmd;
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dt282x_disable_dma(dev);
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@ -953,8 +927,8 @@ static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
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devpriv->nread = devpriv->ntrig;
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devpriv->dma_dir = DMA_MODE_WRITE;
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devpriv->cur_dma = 0;
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devpriv->dma_dir = COMEDI_ISADMA_WRITE;
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dma->cur_dma = 0;
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outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG);
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@ -1058,13 +1032,12 @@ static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x)
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return ai_range_table[x];
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}
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static int dt282x_alloc_dma(struct comedi_device *dev,
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static void dt282x_alloc_dma(struct comedi_device *dev,
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struct comedi_devconfig *it)
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{
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struct dt282x_private *devpriv = dev->private;
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unsigned int irq_num = it->options[1];
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unsigned int dma_chan[2];
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int i;
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if (it->options[2] < it->options[3]) {
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dma_chan[0] = it->options[2];
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@ -1077,53 +1050,24 @@ static int dt282x_alloc_dma(struct comedi_device *dev,
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if (!irq_num || dma_chan[0] == dma_chan[1] ||
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dma_chan[0] < 5 || dma_chan[0] > 7 ||
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dma_chan[1] < 5 || dma_chan[1] > 7)
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return 0;
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return;
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if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev))
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return 0;
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if (request_dma(dma_chan[0], dev->board_name)) {
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return;
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/* DMA uses two 4K buffers with separate DMA channels */
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devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1],
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PAGE_SIZE, 0);
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if (!devpriv->dma)
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free_irq(irq_num, dev);
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return 0;
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}
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if (request_dma(dma_chan[1], dev->board_name)) {
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free_dma(dma_chan[0]);
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free_irq(irq_num, dev);
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return 0;
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}
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dev->irq = irq_num;
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devpriv->dma_maxsize = PAGE_SIZE;
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for (i = 0; i < 2; i++) {
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struct dt282x_dma_desc *dma = &devpriv->dma_desc[i];
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dma->chan = dma_chan[i];
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dma->virt_addr = dma_alloc_coherent(NULL, devpriv->dma_maxsize,
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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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}
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return 0;
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}
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static void dt282x_free_dma(struct comedi_device *dev)
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{
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struct dt282x_private *devpriv = dev->private;
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struct dt282x_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, devpriv->dma_maxsize,
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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 dt282x_initialize(struct comedi_device *dev)
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@ -1181,9 +1125,7 @@ static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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return -ENOMEM;
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/* an IRQ and 2 DMA channels are required for async command support */
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ret = dt282x_alloc_dma(dev, it);
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if (ret)
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return ret;
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dt282x_alloc_dma(dev, it);
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ret = comedi_alloc_subdevices(dev, 3);
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if (ret)
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