From fb5678aff3d469d41d7d7d85e5a12c56b0e1aa94 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 23 Feb 2015 14:57:30 -0700 Subject: [PATCH] staging: comedi: pcl812: convert driver to use the comedi_8254 module 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- 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 a2577ba5dcbd..4691355f1a7e 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 3ffb1ea2ecc8..1bb67aadff59 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 */ -- 2.34.1