This driver uses an 8254 timer to generate the pacer clock used for analog
input data acquisition. Convert it to use the comedi_8254 module to provide
support for the 8254 timer.
Note that the pacer does not have to be stopped when starting a new async
command in pcl812_ai_cmd() or when the card is initialy reset by pcl812_reset().
The counters are all reset when the driver is initially attached and the
counters used by the pacer are stopped when a command is canceled.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/Kconfig | 1 +
drivers/staging/comedi/drivers/pcl812.c | 57 ++++++++++++---------------------
2 files changed, 21 insertions(+), 37 deletions(-)
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index a2577ba..4691355 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -169,6 +169,7 @@ config COMEDI_PCL730
config COMEDI_PCL812
tristate "Advantech PCL-812/813 and ADlink ACL-8112/8113/8113/8216"
select COMEDI_ISADMA if ISA_DMA_API
+ select COMEDI_8254
---help---
Enable support for Advantech PCL-812/PG, PCL-813/B, ADLink
ACL-8112DG/HG/PG, ACL-8113, ACL-8216, ICP DAS A-821PGH/PGL/PGL-NDA,
diff --git a/drivers/staging/comedi/drivers/pcl812.c b/drivers/staging/comedi/drivers/pcl812.c
index 3ffb1ea..1bb67aa 100644
--- a/drivers/staging/comedi/drivers/pcl812.c
+++ b/drivers/staging/comedi/drivers/pcl812.c
@@ -118,7 +118,7 @@
#include "comedi_isadma.h"
#include "comedi_fc.h"
-#include "8253.h"
+#include "comedi_8254.h"
/* hardware types of the cards */
#define boardPCL812PG 0 /* and ACL-8112PG */
@@ -513,8 +513,6 @@ struct pcl812_private {
unsigned char mode_reg_int; /* there is stored INT number for some card */
unsigned int ai_poll_ptr; /* how many sampes transfer poll */
unsigned int max_812_ai_mode0_rangewait; /* setling time for gain */
- unsigned int divisor1;
- unsigned int divisor2;
unsigned int use_diff:1;
unsigned int use_mpc508:1;
unsigned int use_ext_trg:1;
@@ -522,21 +520,6 @@ struct pcl812_private {
unsigned int ai_eos:1;
};
-static void pcl812_start_pacer(struct comedi_device *dev, bool load_timers)
-{
- struct pcl812_private *devpriv = dev->private;
- unsigned long timer_base = dev->iobase + PCL812_TIMER_BASE;
-
- i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
- i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
- udelay(1);
-
- if (load_timers) {
- i8254_write(timer_base, 0, 2, devpriv->divisor2);
- i8254_write(timer_base, 0, 1, devpriv->divisor1);
- }
-}
-
static void pcl812_ai_setup_dma(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int unread_samples)
@@ -650,7 +633,6 @@ static int pcl812_ai_cmdtest(struct comedi_device *dev,
struct pcl812_private *devpriv = dev->private;
int err = 0;
unsigned int flags;
- unsigned int arg;
/* Step 1 : check if triggers are trivially valid */
@@ -703,11 +685,9 @@ static int pcl812_ai_cmdtest(struct comedi_device *dev,
/* step 4: fix up any arguments */
if (cmd->convert_src == TRIG_TIMER) {
- arg = cmd->convert_arg;
- i8253_cascade_ns_to_timer(I8254_OSC_BASE_2MHZ,
- &devpriv->divisor1,
- &devpriv->divisor2,
- &arg, cmd->flags);
+ unsigned int arg = cmd->convert_arg;
+
+ comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
}
@@ -725,8 +705,6 @@ static int pcl812_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
unsigned int ctrl = 0;
unsigned int i;
- pcl812_start_pacer(dev, false);
-
pcl812_ai_set_chan_range(dev, cmd->chanlist[0], 1);
if (dma) { /* check if we can use DMA transfer */
@@ -760,7 +738,8 @@ static int pcl812_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
switch (cmd->convert_src) {
case TRIG_TIMER:
- pcl812_start_pacer(dev, true);
+ comedi_8254_update_divisors(dev->pacer);
+ comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
break;
}
@@ -918,7 +897,7 @@ static int pcl812_ai_cancel(struct comedi_device *dev,
outb(devpriv->mode_reg_int | PCL812_CTRL_DISABLE_TRIG,
dev->iobase + PCL812_CTRL_REG);
- pcl812_start_pacer(dev, false);
+ comedi_8254_pacer_enable(dev->pacer, 1, 2, false);
pcl812_ai_clear_eoc(dev);
return 0;
}
@@ -1010,10 +989,6 @@ static void pcl812_reset(struct comedi_device *dev)
dev->iobase + PCL812_CTRL_REG);
pcl812_ai_clear_eoc(dev);
- /* stop pacer */
- if (board->IRQbits)
- pcl812_start_pacer(dev, false);
-
/*
* Invalidate last_ai_chanspec then set analog input to
* known channel/range.
@@ -1162,11 +1137,19 @@ static int pcl812_attach(struct comedi_device *dev, struct comedi_devconfig *it)
if (ret)
return ret;
- if ((1 << it->options[1]) & board->IRQbits) {
- ret = request_irq(it->options[1], pcl812_interrupt, 0,
- dev->board_name, dev);
- if (ret == 0)
- dev->irq = it->options[1];
+ if (board->IRQbits) {
+ dev->pacer = comedi_8254_init(dev->iobase + PCL812_TIMER_BASE,
+ I8254_OSC_BASE_2MHZ,
+ I8254_IO8, 0);
+ if (!dev->pacer)
+ return -ENOMEM;
+
+ if ((1 << it->options[1]) & board->IRQbits) {
+ ret = request_irq(it->options[1], pcl812_interrupt, 0,
+ dev->board_name, dev);
+ if (ret == 0)
+ dev->irq = it->options[1];
+ }
}
/* we need an IRQ to do DMA on channel 3 or 1 */
--
2.3.0
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