staging: comedi: pcl816: convert driver to use the comedi_8254 module
This driver uses an 8254 timer to generate the pacer clock used for analog input data conversion. Convert it to use the comedi_8254 module to provide support for the 8254 timer. 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>
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@ -181,6 +181,7 @@ config COMEDI_PCL812
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config COMEDI_PCL816
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tristate "Advantech PCL-814 and PCL-816 ISA card support"
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select COMEDI_ISADMA if ISA_DMA_API
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select COMEDI_8254
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---help---
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Enable support for Advantech PCL-814 and PCL-816 ISA cards
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@ -42,7 +42,7 @@ Configuration Options:
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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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#include "comedi_8254.h"
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/*
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* Register I/O map
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@ -116,31 +116,10 @@ static const struct pcl816_board boardtypes[] = {
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struct pcl816_private {
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struct comedi_isadma *dma;
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unsigned int ai_poll_ptr; /* how many sampes transfer poll */
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unsigned int divisor1;
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unsigned int divisor2;
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unsigned int ai_cmd_running:1;
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unsigned int ai_cmd_canceled:1;
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};
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static void pcl816_start_pacer(struct comedi_device *dev, bool load_counters)
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{
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struct pcl816_private *devpriv = dev->private;
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unsigned long timer_base = dev->iobase + PCL816_TIMER_BASE;
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i8254_set_mode(timer_base, 0, 0, I8254_MODE1 | I8254_BINARY);
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i8254_write(timer_base, 0, 0, 0x00ff);
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udelay(1);
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i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
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i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
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udelay(1);
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if (load_counters) {
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i8254_write(timer_base, 0, 2, devpriv->divisor2);
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i8254_write(timer_base, 0, 1, devpriv->divisor1);
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}
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}
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static void pcl816_ai_setup_dma(struct comedi_device *dev,
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struct comedi_subdevice *s,
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unsigned int unread_samples)
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@ -367,9 +346,7 @@ static int check_channel_list(struct comedi_device *dev,
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static int pcl816_ai_cmdtest(struct comedi_device *dev,
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struct comedi_subdevice *s, struct comedi_cmd *cmd)
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{
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struct pcl816_private *devpriv = dev->private;
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int err = 0;
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unsigned int arg;
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/* Step 1 : check if triggers are trivially valid */
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@ -416,11 +393,9 @@ static int pcl816_ai_cmdtest(struct comedi_device *dev,
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/* step 4: fix up any arguments */
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if (cmd->convert_src == TRIG_TIMER) {
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arg = cmd->convert_arg;
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i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
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&devpriv->divisor1,
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&devpriv->divisor2,
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&arg, cmd->flags);
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unsigned int arg = cmd->convert_arg;
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comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
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err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
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}
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@ -450,8 +425,6 @@ static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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if (devpriv->ai_cmd_running)
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return -EBUSY;
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pcl816_start_pacer(dev, false);
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seglen = check_channel_list(dev, s, cmd->chanlist, cmd->chanlist_len);
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if (seglen < 1)
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return -EINVAL;
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@ -466,7 +439,11 @@ static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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dma->cur_dma = 0;
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pcl816_ai_setup_dma(dev, s, 0);
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pcl816_start_pacer(dev, true);
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comedi_8254_set_mode(dev->pacer, 0, I8254_MODE1 | I8254_BINARY);
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comedi_8254_write(dev->pacer, 0, 0x0ff);
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udelay(1);
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comedi_8254_update_divisors(dev->pacer);
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comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
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ctrl = PCL816_CTRL_INTEN | PCL816_CTRL_DMAEN | PCL816_CTRL_DMASRC_SLOT0;
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if (cmd->convert_src == TRIG_TIMER)
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@ -525,11 +502,7 @@ static int pcl816_ai_cancel(struct comedi_device *dev,
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outb(PCL816_CTRL_DISABLE_TRIG, dev->iobase + PCL816_CTRL_REG);
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pcl816_ai_clear_eoc(dev);
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/* Stop pacer */
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i8254_set_mode(dev->iobase + PCL816_TIMER_BASE, 0,
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2, I8254_MODE0 | I8254_BINARY);
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i8254_set_mode(dev->iobase + PCL816_TIMER_BASE, 0,
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1, I8254_MODE0 | I8254_BINARY);
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comedi_8254_pacer_enable(dev->pacer, 1, 2, false);
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devpriv->ai_cmd_running = 0;
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devpriv->ai_cmd_canceled = 1;
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@ -596,17 +569,10 @@ static int pcl816_do_insn_bits(struct comedi_device *dev,
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static void pcl816_reset(struct comedi_device *dev)
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{
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unsigned long timer_base = dev->iobase + PCL816_TIMER_BASE;
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outb(PCL816_CTRL_DISABLE_TRIG, dev->iobase + PCL816_CTRL_REG);
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pcl816_ai_set_chan_range(dev, 0, 0);
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pcl816_ai_clear_eoc(dev);
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/* Stop pacer */
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i8254_set_mode(timer_base, 0, 2, I8254_MODE0 | I8254_BINARY);
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i8254_set_mode(timer_base, 0, 1, I8254_MODE0 | I8254_BINARY);
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i8254_set_mode(timer_base, 0, 0, I8254_MODE0 | I8254_BINARY);
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/* set all digital outputs low */
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outb(0, dev->iobase + PCL816_DO_DI_LSB_REG);
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outb(0, dev->iobase + PCL816_DO_DI_MSB_REG);
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@ -662,6 +628,11 @@ static int pcl816_attach(struct comedi_device *dev, struct comedi_devconfig *it)
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/* an IRQ and DMA are required to support async commands */
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pcl816_alloc_irq_and_dma(dev, it);
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dev->pacer = comedi_8254_init(dev->iobase + PCL816_TIMER_BASE,
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I8254_OSC_BASE_10MHZ, I8254_IO8, 0);
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if (!dev->pacer)
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return -ENOMEM;
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ret = comedi_alloc_subdevices(dev, 4);
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if (ret)
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return ret;
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