staging: comedi: pcl812: 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
bd7ea421e3
Коммит
f3df482a0c
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@ -168,7 +168,7 @@ config COMEDI_PCL730
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config COMEDI_PCL812
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tristate "Advantech PCL-812/813 and ADlink ACL-8112/8113/8113/8216"
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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 Advantech PCL-812/PG, PCL-813/B, ADLink
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ACL-8112DG/HG/PG, ACL-8113, ACL-8216, ICP DAS A-821PGH/PGL/PGL-NDA,
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@ -111,12 +111,12 @@
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/gfp.h>
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#include "../comedidev.h"
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#include <linux/delay.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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#include "8253.h"
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@ -506,21 +506,12 @@ static const struct pcl812_board boardtypes[] = {
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},
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};
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struct pcl812_dma_desc {
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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 pcl812_private {
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unsigned char dma; /* >0 use dma ( usedDMA channel) */
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struct comedi_isadma *dma;
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unsigned char range_correction; /* =1 we must add 1 to range number */
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unsigned int last_ai_chanspec;
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unsigned char mode_reg_int; /* there is stored INT number for some card */
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unsigned int ai_poll_ptr; /* how many sampes transfer poll */
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unsigned int hwdmasize;
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struct pcl812_dma_desc dma_desc[2];
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int cur_dma;
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unsigned int dma_runs_to_end; /* how many times we must switch DMA buffers */
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unsigned int last_dma_run; /* how many bytes to transfer on last DMA buffer */
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unsigned int max_812_ai_mode0_rangewait; /* setling time for gain */
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@ -533,29 +524,6 @@ struct pcl812_private {
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unsigned int ai_eos:1;
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};
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static void pcl812_isadma_program(unsigned int dma_chan,
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struct pcl812_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 void pcl812_isadma_disable(unsigned int dma_chan)
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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 void pcl812_start_pacer(struct comedi_device *dev, bool load_timers)
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{
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struct pcl812_private *devpriv = dev->private;
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@ -575,23 +543,24 @@ static void pcl812_ai_setup_dma(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct pcl812_private *devpriv = dev->private;
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struct pcl812_dma_desc *dma0 = &devpriv->dma_desc[0];
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struct pcl812_dma_desc *dma1 = &devpriv->dma_desc[1];
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struct comedi_isadma *dma = devpriv->dma;
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struct comedi_isadma_desc *desc0 = &dma->desc[0];
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struct comedi_isadma_desc *desc1 = &dma->desc[1];
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struct comedi_cmd *cmd = &s->async->cmd;
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unsigned int bytes;
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/* we use EOS, so adapt DMA buffer to one scan */
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if (devpriv->ai_eos) {
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dma0->size = comedi_bytes_per_scan(s);
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dma1->size = comedi_bytes_per_scan(s);
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desc0->size = comedi_bytes_per_scan(s);
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desc1->size = comedi_bytes_per_scan(s);
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devpriv->dma_runs_to_end = 1;
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} else {
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dma0->size = devpriv->hwdmasize;
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dma1->size = devpriv->hwdmasize;
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if (s->async->prealloc_bufsz < devpriv->hwdmasize) {
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dma0->size = s->async->prealloc_bufsz;
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dma1->size = s->async->prealloc_bufsz;
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}
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desc0->size = desc0->maxsize;
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desc1->size = desc1->maxsize;
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if (s->async->prealloc_bufsz < desc0->maxsize)
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desc0->size = s->async->prealloc_bufsz;
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if (s->async->prealloc_bufsz < desc1->maxsize)
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desc1->size = s->async->prealloc_bufsz;
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if (cmd->stop_src == TRIG_NONE) {
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devpriv->dma_runs_to_end = 1;
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} else {
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@ -599,46 +568,47 @@ static void pcl812_ai_setup_dma(struct comedi_device *dev,
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bytes = cmd->stop_arg * comedi_bytes_per_scan(s);
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/* how many DMA pages we must fill */
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devpriv->dma_runs_to_end = bytes / dma0->size;
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devpriv->dma_runs_to_end = bytes / desc0->size;
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/* on last dma transfer must be moved */
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devpriv->last_dma_run = bytes % dma0->size;
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devpriv->last_dma_run = bytes % desc0->size;
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if (devpriv->dma_runs_to_end == 0)
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dma0->size = devpriv->last_dma_run;
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desc0->size = devpriv->last_dma_run;
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devpriv->dma_runs_to_end--;
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}
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}
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if (dma0->size > devpriv->hwdmasize) {
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dma0->size = devpriv->hwdmasize;
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if (desc0->size > desc0->maxsize) {
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desc0->size = desc0->maxsize;
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devpriv->ai_eos = 0;
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}
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if (dma1->size > devpriv->hwdmasize) {
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dma1->size = devpriv->hwdmasize;
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if (desc1->size > desc1->maxsize) {
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desc1->size = desc1->maxsize;
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devpriv->ai_eos = 0;
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}
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devpriv->cur_dma = 0;
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dma->cur_dma = 0;
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pcl812_isadma_program(devpriv->dma, dma0);
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comedi_isadma_program(desc0);
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}
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static void pcl812_ai_setup_next_dma(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct pcl812_private *devpriv = dev->private;
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struct pcl812_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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pcl812_isadma_disable(devpriv->dma);
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comedi_isadma_disable(dma->chan);
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dma->cur_dma = 1 - dma->cur_dma;
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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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desc = &dma->desc[dma->cur_dma];
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if (!devpriv->ai_eos) {
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if (devpriv->dma_runs_to_end)
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devpriv->dma_runs_to_end--;
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else
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dma->size = devpriv->last_dma_run;
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desc->size = devpriv->last_dma_run;
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}
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pcl812_isadma_program(devpriv->dma, dma);
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comedi_isadma_program(desc);
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}
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static void pcl812_ai_set_chan_range(struct comedi_device *dev,
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@ -904,17 +874,19 @@ static void pcl812_handle_dma(struct comedi_device *dev,
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struct comedi_subdevice *s)
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{
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struct pcl812_private *devpriv = dev->private;
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struct pcl812_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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unsigned int nsamples;
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int bufptr;
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pcl812_ai_setup_next_dma(dev, s);
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nsamples = comedi_bytes_to_samples(s, dma->size) - devpriv->ai_poll_ptr;
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nsamples = comedi_bytes_to_samples(s, desc->size) -
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devpriv->ai_poll_ptr;
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bufptr = devpriv->ai_poll_ptr;
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devpriv->ai_poll_ptr = 0;
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transfer_from_dma_buf(dev, s, dma->virt_addr, bufptr, nsamples);
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transfer_from_dma_buf(dev, s, desc->virt_addr, bufptr, nsamples);
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}
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static irqreturn_t pcl812_interrupt(int irq, void *d)
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@ -942,45 +914,37 @@ static irqreturn_t pcl812_interrupt(int irq, void *d)
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static int pcl812_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s)
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{
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struct pcl812_private *devpriv = dev->private;
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struct pcl812_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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unsigned long flags;
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unsigned int top1, top2, i;
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unsigned int poll;
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int ret;
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/* poll is valid only for DMA transfer */
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if (!devpriv->ai_dma)
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return 0; /* poll is valid only for DMA transfer */
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return 0;
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spin_lock_irqsave(&dev->spinlock, flags);
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for (i = 0; i < 10; i++) {
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/* where is now DMA */
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top1 = get_dma_residue(devpriv->ai_dma);
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top2 = get_dma_residue(devpriv->ai_dma);
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if (top1 == top2)
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break;
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}
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poll = comedi_isadma_poll(dma);
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poll = comedi_bytes_to_samples(s, poll);
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if (poll > devpriv->ai_poll_ptr) {
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desc = &dma->desc[dma->cur_dma];
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transfer_from_dma_buf(dev, s, desc->virt_addr,
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devpriv->ai_poll_ptr,
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poll - devpriv->ai_poll_ptr);
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/* new buffer position */
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devpriv->ai_poll_ptr = poll;
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if (top1 != top2) {
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spin_unlock_irqrestore(&dev->spinlock, flags);
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return 0;
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ret = comedi_buf_n_bytes_ready(s);
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} else {
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/* no new samples */
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ret = 0;
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}
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/* where is now DMA in buffer */
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dma = &devpriv->dma_desc[1 - devpriv->cur_dma];
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top1 = dma->size - top1;
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top1 >>= 1; /* sample position */
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top2 = top1 - devpriv->ai_poll_ptr;
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if (top2 < 1) { /* no new samples */
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spin_unlock_irqrestore(&dev->spinlock, flags);
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return 0;
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}
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transfer_from_dma_buf(dev, s, dma->virt_addr,
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devpriv->ai_poll_ptr, top2);
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devpriv->ai_poll_ptr = top1; /* new buffer position */
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spin_unlock_irqrestore(&dev->spinlock, flags);
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return comedi_buf_n_bytes_ready(s);
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return ret;
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}
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static int pcl812_ai_cancel(struct comedi_device *dev,
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@ -989,7 +953,7 @@ static int pcl812_ai_cancel(struct comedi_device *dev,
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struct pcl812_private *devpriv = dev->private;
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if (devpriv->ai_dma)
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pcl812_isadma_disable(devpriv->dma);
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comedi_isadma_disable(devpriv->dma->chan);
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outb(devpriv->mode_reg_int | PCL812_CTRL_DISABLE_TRIG,
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dev->iobase + PCL812_CTRL_REG);
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@ -1199,49 +1163,25 @@ static void pcl812_set_ai_range_table(struct comedi_device *dev,
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}
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}
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static int pcl812_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
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static void pcl812_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
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{
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struct pcl812_private *devpriv = dev->private;
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struct pcl812_dma_desc *dma;
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int i;
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/* only DMA channels 3 and 1 are valid */
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if (!(dma_chan == 3 || dma_chan == 1))
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return 0;
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return;
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if (request_dma(dma_chan, dev->board_name))
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return 0;
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devpriv->dma = dma_chan;
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devpriv->hwdmasize = PAGE_SIZE * 2; /* we want 8KB */
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for (i = 0; i < 2; i++) {
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dma = &devpriv->dma_desc[i];
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dma->virt_addr = dma_alloc_coherent(NULL, devpriv->hwdmasize,
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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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/* DMA uses two 8K buffers */
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devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
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PAGE_SIZE * 2, COMEDI_ISADMA_READ);
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}
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static void pcl812_free_dma(struct comedi_device *dev)
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{
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struct pcl812_private *devpriv = dev->private;
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struct pcl812_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->virt_addr)
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dma_free_coherent(NULL, devpriv->hwdmasize,
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dma->virt_addr, dma->hw_addr);
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}
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if (devpriv->dma)
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free_dma(devpriv->dma);
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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 pcl812_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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@ -1269,11 +1209,8 @@ static int pcl812_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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}
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/* we need an IRQ to do DMA on channel 3 or 1 */
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if (dev->irq && board->has_dma) {
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ret = pcl812_alloc_dma(dev, it->options[2]);
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if (ret)
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return ret;
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}
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if (dev->irq && board->has_dma)
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pcl812_alloc_dma(dev, it->options[2]);
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/* differential analog inputs? */
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switch (board->board_type) {
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