#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/delay.h>
+#include <linux/slab.h>
#include "../comedidev.h"
-#include "8253.h"
+#include "comedi_8254.h"
#include "8255.h"
#include "comedi_fc.h"
#include "ni_labpc.h"
writeb(byte, dev->mmio + reg);
}
-static void labpc_counter_load(struct comedi_device *dev,
- unsigned long reg,
- unsigned int counter_number,
- unsigned int count,
- unsigned int mode)
-{
- if (dev->mmio) {
- i8254_mm_set_mode(dev->mmio + reg, 0, counter_number, mode);
- i8254_mm_write(dev->mmio + reg, 0, counter_number, count);
- } else {
- i8254_set_mode(dev->iobase + reg, 0, counter_number, mode);
- i8254_write(dev->iobase + reg, 0, counter_number, count);
- }
-}
-
-static void labpc_counter_set_mode(struct comedi_device *dev,
- unsigned long reg,
- unsigned int counter_number,
- unsigned int mode)
-{
- if (dev->mmio)
- i8254_mm_set_mode(dev->mmio + reg, 0, counter_number, mode);
- else
- i8254_set_mode(dev->iobase + reg, 0, counter_number, mode);
-}
-
static int labpc_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct labpc_private *devpriv = dev->private;
devpriv->write_byte(dev, devpriv->cmd4, CMD4_REG);
/* initialize pacer counter to prevent any problems */
- labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 0, I8254_MODE2);
+ comedi_8254_set_mode(devpriv->counter, 0, I8254_MODE2 | I8254_BINARY);
labpc_clear_adc_fifo(dev);
static void labpc_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd,
enum scan_mode mode)
{
- struct labpc_private *devpriv = dev->private;
+ struct comedi_8254 *pacer = dev->pacer;
+ unsigned int convert_period = labpc_ai_convert_period(cmd, mode);
+ unsigned int scan_period = labpc_ai_scan_period(cmd, mode);
unsigned int base_period;
- unsigned int scan_period;
- unsigned int convert_period;
/*
- * if both convert and scan triggers are TRIG_TIMER, then they
- * both rely on counter b0
+ * If both convert and scan triggers are TRIG_TIMER, then they
+ * both rely on counter b0. If only one TRIG_TIMER is used, we
+ * can use the generic cascaded timing functions.
*/
- convert_period = labpc_ai_convert_period(cmd, mode);
- scan_period = labpc_ai_scan_period(cmd, mode);
if (convert_period && scan_period) {
/*
- * pick the lowest b0 divisor value we can (for maximum input
+ * pick the lowest divisor value we can (for maximum input
* clock speed on convert and scan counters)
*/
- devpriv->divisor_b0 = (scan_period - 1) /
- (I8254_OSC_BASE_2MHZ * 0x10000) + 1;
+ pacer->next_div1 = (scan_period - 1) /
+ (pacer->osc_base * I8254_MAX_COUNT) + 1;
- cfc_check_trigger_arg_min(&devpriv->divisor_b0, 2);
- cfc_check_trigger_arg_max(&devpriv->divisor_b0, 0x10000);
+ cfc_check_trigger_arg_min(&pacer->next_div1, 2);
+ cfc_check_trigger_arg_max(&pacer->next_div1, I8254_MAX_COUNT);
- base_period = I8254_OSC_BASE_2MHZ * devpriv->divisor_b0;
+ base_period = pacer->osc_base * pacer->next_div1;
/* set a0 for conversion frequency and b1 for scan frequency */
switch (cmd->flags & CMDF_ROUND_MASK) {
default:
case CMDF_ROUND_NEAREST:
- devpriv->divisor_a0 = DIV_ROUND_CLOSEST(convert_period,
- base_period);
- devpriv->divisor_b1 = DIV_ROUND_CLOSEST(scan_period,
- base_period);
+ pacer->next_div = DIV_ROUND_CLOSEST(convert_period,
+ base_period);
+ pacer->next_div2 = DIV_ROUND_CLOSEST(scan_period,
+ base_period);
break;
case CMDF_ROUND_UP:
- devpriv->divisor_a0 = DIV_ROUND_UP(convert_period,
- base_period);
- devpriv->divisor_b1 = DIV_ROUND_UP(scan_period,
- base_period);
+ pacer->next_div = DIV_ROUND_UP(convert_period,
+ base_period);
+ pacer->next_div2 = DIV_ROUND_UP(scan_period,
+ base_period);
break;
case CMDF_ROUND_DOWN:
- devpriv->divisor_a0 = convert_period / base_period;
- devpriv->divisor_b1 = scan_period / base_period;
+ pacer->next_div = convert_period / base_period;
+ pacer->next_div2 = scan_period / base_period;
break;
}
/* make sure a0 and b1 values are acceptable */
- cfc_check_trigger_arg_min(&devpriv->divisor_a0, 2);
- cfc_check_trigger_arg_max(&devpriv->divisor_a0, 0x10000);
- cfc_check_trigger_arg_min(&devpriv->divisor_b1, 2);
- cfc_check_trigger_arg_max(&devpriv->divisor_b1, 0x10000);
+ cfc_check_trigger_arg_min(&pacer->next_div, 2);
+ cfc_check_trigger_arg_max(&pacer->next_div, I8254_MAX_COUNT);
+ cfc_check_trigger_arg_min(&pacer->next_div2, 2);
+ cfc_check_trigger_arg_max(&pacer->next_div2, I8254_MAX_COUNT);
+
/* write corrected timings to command */
labpc_set_ai_convert_period(cmd, mode,
- base_period * devpriv->divisor_a0);
+ base_period * pacer->next_div);
labpc_set_ai_scan_period(cmd, mode,
- base_period * devpriv->divisor_b1);
- /*
- * if only one TRIG_TIMER is used, we can employ the generic
- * cascaded timing functions
- */
+ base_period * pacer->next_div2);
} else if (scan_period) {
/*
* calculate cascaded counter values
* that give desired scan timing
+ * (pacer->next_div2 / pacer->next_div1)
*/
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
- &devpriv->divisor_b1,
- &devpriv->divisor_b0,
- &scan_period, cmd->flags);
+ comedi_8254_cascade_ns_to_timer(pacer, &scan_period,
+ cmd->flags);
labpc_set_ai_scan_period(cmd, mode, scan_period);
} else if (convert_period) {
/*
* calculate cascaded counter values
* that give desired conversion timing
+ * (pacer->next_div / pacer->next_div1)
*/
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
- &devpriv->divisor_a0,
- &devpriv->divisor_b0,
- &convert_period, cmd->flags);
+ comedi_8254_cascade_ns_to_timer(pacer, &convert_period,
+ cmd->flags);
+ /* transfer div2 value so correct timer gets updated */
+ pacer->next_div = pacer->next_div2;
labpc_set_ai_convert_period(cmd, mode, convert_period);
}
}
* load counter a1 with count of 3
* (pc+ manual says this is minimum allowed) using mode 0
*/
- labpc_counter_load(dev, COUNTER_A_BASE_REG,
- 1, 3, I8254_MODE0);
+ comedi_8254_load(devpriv->counter, 1,
+ 3, I8254_MODE0 | I8254_BINARY);
} else {
/* just put counter a1 in mode 0 to set its output low */
- labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 1, I8254_MODE0);
+ comedi_8254_set_mode(devpriv->counter, 1,
+ I8254_MODE0 | I8254_BINARY);
}
/* figure out what method we will use to transfer data */
if (cmd->convert_src == TRIG_TIMER ||
cmd->scan_begin_src == TRIG_TIMER) {
- /* set up pacing */
- labpc_adc_timing(dev, cmd, mode);
- /* load counter b0 in mode 3 */
- labpc_counter_load(dev, COUNTER_B_BASE_REG,
- 0, devpriv->divisor_b0, I8254_MODE3);
- }
- /* set up conversion pacing */
- if (labpc_ai_convert_period(cmd, mode)) {
- /* load counter a0 in mode 2 */
- labpc_counter_load(dev, COUNTER_A_BASE_REG,
- 0, devpriv->divisor_a0, I8254_MODE2);
- } else {
- /* initialize pacer counter to prevent any problems */
- labpc_counter_set_mode(dev, COUNTER_A_BASE_REG, 0, I8254_MODE2);
- }
+ struct comedi_8254 *pacer = dev->pacer;
+ struct comedi_8254 *counter = devpriv->counter;
+
+ comedi_8254_update_divisors(pacer);
+
+ /* set up pacing */
+ comedi_8254_load(pacer, 0, pacer->divisor1,
+ I8254_MODE3 | I8254_BINARY);
- /* set up scan pacing */
- if (labpc_ai_scan_period(cmd, mode)) {
- /* load counter b1 in mode 2 */
- labpc_counter_load(dev, COUNTER_B_BASE_REG,
- 1, devpriv->divisor_b1, I8254_MODE2);
+ /* set up conversion pacing */
+ comedi_8254_set_mode(counter, 0, I8254_MODE2 | I8254_BINARY);
+ if (labpc_ai_convert_period(cmd, mode))
+ comedi_8254_write(counter, 0, pacer->divisor);
+
+ /* set up scan pacing */
+ if (labpc_ai_scan_period(cmd, mode))
+ comedi_8254_load(pacer, 1, pacer->divisor2,
+ I8254_MODE2 | I8254_BINARY);
}
labpc_clear_adc_fifo(dev);
dev->irq = irq;
}
+ if (dev->mmio) {
+ dev->pacer = comedi_8254_mm_init(dev->mmio + COUNTER_B_BASE_REG,
+ I8254_OSC_BASE_2MHZ,
+ I8254_IO8, 0);
+ devpriv->counter = comedi_8254_mm_init(dev->mmio +
+ COUNTER_A_BASE_REG,
+ I8254_OSC_BASE_2MHZ,
+ I8254_IO8, 0);
+ } else {
+ dev->pacer = comedi_8254_init(dev->iobase + COUNTER_B_BASE_REG,
+ I8254_OSC_BASE_2MHZ,
+ I8254_IO8, 0);
+ devpriv->counter = comedi_8254_init(dev->iobase +
+ COUNTER_A_BASE_REG,
+ I8254_OSC_BASE_2MHZ,
+ I8254_IO8, 0);
+ }
+ if (!dev->pacer || !devpriv->counter)
+ return -ENOMEM;
+
ret = comedi_alloc_subdevices(dev, 5);
if (ret)
return ret;
}
EXPORT_SYMBOL_GPL(labpc_common_attach);
+void labpc_common_detach(struct comedi_device *dev)
+{
+ struct labpc_private *devpriv = dev->private;
+
+ if (devpriv)
+ kfree(devpriv->counter);
+}
+EXPORT_SYMBOL_GPL(labpc_common_detach);
+
static int __init labpc_common_init(void)
{
return 0;
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