staging: comedi: pcl711: use 8253.h helper to set the timers
To better document the code, use the i8254_load() helper to set the timers instead of doing the outb() instructions. 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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@ -65,10 +65,7 @@ supported.
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/*
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* I/O port register map
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*/
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#define PCL711_CTR0 0x00
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#define PCL711_CTR1 0x01
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#define PCL711_CTR2 0x02
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#define PCL711_CTRCTL 0x03
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#define PCL711_TIMER_BASE 0x00
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#define PCL711_AI_LSB_REG 0x04
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#define PCL711_AI_MSB_REG 0x05
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#define PCL711_AI_MSB_DRDY (1 << 4)
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@ -380,27 +377,15 @@ static int pcl711_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
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pcl711_set_changain(dev, s, cmd->chanlist[0]);
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if (cmd->scan_begin_src == TRIG_TIMER) {
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/*
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* Set timers
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* timer chip is an 8253, with timers 1 and 2
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* cascaded
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* 0x74 = Select Counter 1 | LSB/MSB | Mode=2 | Binary
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* Mode 2 = Rate generator
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*
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* 0xb4 = Select Counter 2 | LSB/MSB | Mode=2 | Binary
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*/
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timer1 = timer2 = 0;
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i8253_cascade_ns_to_timer(i8253_osc_base, &timer1, &timer2,
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&cmd->scan_begin_arg,
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TRIG_ROUND_NEAREST);
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outb(0x74, dev->iobase + PCL711_CTRCTL);
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outb(timer1 & 0xff, dev->iobase + PCL711_CTR1);
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outb((timer1 >> 8) & 0xff, dev->iobase + PCL711_CTR1);
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outb(0xb4, dev->iobase + PCL711_CTRCTL);
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outb(timer2 & 0xff, dev->iobase + PCL711_CTR2);
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outb((timer2 >> 8) & 0xff, dev->iobase + PCL711_CTR2);
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i8254_load(dev->iobase + PCL711_TIMER_BASE, 0,
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1, timer1, I8254_MODE2 | I8254_BINARY);
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i8254_load(dev->iobase + PCL711_TIMER_BASE, 0,
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2, timer2, I8254_MODE2 | I8254_BINARY);
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/* clear pending interrupts (just in case) */
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outb(0, dev->iobase + PCL711_CLRINTR);
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