From f48c21fc62addff97c5dbf765a93ba604031dd2d Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 23 Feb 2015 14:57:31 -0700 Subject: [PATCH] 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- drivers/staging/comedi/Kconfig | 1 + drivers/staging/comedi/drivers/pcl816.c | 59 +++++++------------------ 2 files changed, 16 insertions(+), 44 deletions(-) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 4691355f1a7e..ff8cb3a46ab1 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -181,6 +181,7 @@ config COMEDI_PCL812 config COMEDI_PCL816 tristate "Advantech PCL-814 and PCL-816 ISA card support" select COMEDI_ISADMA if ISA_DMA_API + select COMEDI_8254 ---help--- Enable support for Advantech PCL-814 and PCL-816 ISA cards diff --git a/drivers/staging/comedi/drivers/pcl816.c b/drivers/staging/comedi/drivers/pcl816.c index da35edfccbc3..9cc6933d47da 100644 --- a/drivers/staging/comedi/drivers/pcl816.c +++ b/drivers/staging/comedi/drivers/pcl816.c @@ -42,7 +42,7 @@ Configuration Options: #include "comedi_isadma.h" #include "comedi_fc.h" -#include "8253.h" +#include "comedi_8254.h" /* * Register I/O map @@ -116,31 +116,10 @@ static const struct pcl816_board boardtypes[] = { struct pcl816_private { struct comedi_isadma *dma; unsigned int ai_poll_ptr; /* how many sampes transfer poll */ - unsigned int divisor1; - unsigned int divisor2; unsigned int ai_cmd_running:1; unsigned int ai_cmd_canceled:1; }; -static void pcl816_start_pacer(struct comedi_device *dev, bool load_counters) -{ - struct pcl816_private *devpriv = dev->private; - unsigned long timer_base = dev->iobase + PCL816_TIMER_BASE; - - i8254_set_mode(timer_base, 0, 0, I8254_MODE1 | I8254_BINARY); - i8254_write(timer_base, 0, 0, 0x00ff); - udelay(1); - - 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_counters) { - i8254_write(timer_base, 0, 2, devpriv->divisor2); - i8254_write(timer_base, 0, 1, devpriv->divisor1); - } -} - static void pcl816_ai_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s, unsigned int unread_samples) @@ -367,9 +346,7 @@ static int check_channel_list(struct comedi_device *dev, static int pcl816_ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { - struct pcl816_private *devpriv = dev->private; int err = 0; - unsigned int arg; /* Step 1 : check if triggers are trivially valid */ @@ -416,11 +393,9 @@ static int pcl816_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_10MHZ, - &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); } @@ -450,8 +425,6 @@ static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) if (devpriv->ai_cmd_running) return -EBUSY; - pcl816_start_pacer(dev, false); - seglen = check_channel_list(dev, s, cmd->chanlist, cmd->chanlist_len); if (seglen < 1) return -EINVAL; @@ -466,7 +439,11 @@ static int pcl816_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) dma->cur_dma = 0; pcl816_ai_setup_dma(dev, s, 0); - pcl816_start_pacer(dev, true); + comedi_8254_set_mode(dev->pacer, 0, I8254_MODE1 | I8254_BINARY); + comedi_8254_write(dev->pacer, 0, 0x0ff); + udelay(1); + comedi_8254_update_divisors(dev->pacer); + comedi_8254_pacer_enable(dev->pacer, 1, 2, true); ctrl = PCL816_CTRL_INTEN | PCL816_CTRL_DMAEN | PCL816_CTRL_DMASRC_SLOT0; if (cmd->convert_src == TRIG_TIMER) @@ -525,11 +502,7 @@ static int pcl816_ai_cancel(struct comedi_device *dev, outb(PCL816_CTRL_DISABLE_TRIG, dev->iobase + PCL816_CTRL_REG); pcl816_ai_clear_eoc(dev); - /* Stop pacer */ - i8254_set_mode(dev->iobase + PCL816_TIMER_BASE, 0, - 2, I8254_MODE0 | I8254_BINARY); - i8254_set_mode(dev->iobase + PCL816_TIMER_BASE, 0, - 1, I8254_MODE0 | I8254_BINARY); + comedi_8254_pacer_enable(dev->pacer, 1, 2, false); devpriv->ai_cmd_running = 0; devpriv->ai_cmd_canceled = 1; @@ -596,17 +569,10 @@ static int pcl816_do_insn_bits(struct comedi_device *dev, static void pcl816_reset(struct comedi_device *dev) { - unsigned long timer_base = dev->iobase + PCL816_TIMER_BASE; - outb(PCL816_CTRL_DISABLE_TRIG, dev->iobase + PCL816_CTRL_REG); pcl816_ai_set_chan_range(dev, 0, 0); pcl816_ai_clear_eoc(dev); - /* Stop pacer */ - i8254_set_mode(timer_base, 0, 2, I8254_MODE0 | I8254_BINARY); - i8254_set_mode(timer_base, 0, 1, I8254_MODE0 | I8254_BINARY); - i8254_set_mode(timer_base, 0, 0, I8254_MODE0 | I8254_BINARY); - /* set all digital outputs low */ outb(0, dev->iobase + PCL816_DO_DI_LSB_REG); outb(0, dev->iobase + PCL816_DO_DI_MSB_REG); @@ -662,6 +628,11 @@ static int pcl816_attach(struct comedi_device *dev, struct comedi_devconfig *it) /* an IRQ and DMA are required to support async commands */ pcl816_alloc_irq_and_dma(dev, it); + dev->pacer = comedi_8254_init(dev->iobase + PCL816_TIMER_BASE, + I8254_OSC_BASE_10MHZ, I8254_IO8, 0); + if (!dev->pacer) + return -ENOMEM; + ret = comedi_alloc_subdevices(dev, 4); if (ret) return ret; -- 2.34.1