From 18c284c68b8a52335c9d1ae53b2236ea350310d7 Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Mon, 23 Feb 2015 14:57:32 -0700 Subject: [PATCH] staging: comedi: pcl818: 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 pcl818_ai_cmd() or when the card is initialy reset by pcl818_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/pcl818.c | 80 +++++++++---------------- 2 files changed, 30 insertions(+), 51 deletions(-) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index ff8cb3a46ab1..3698f6897491 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -191,6 +191,7 @@ config COMEDI_PCL816 config COMEDI_PCL818 tristate "Advantech PCL-718 and PCL-818 ISA card support" select COMEDI_ISADMA if ISA_DMA_API + select COMEDI_8254 ---help--- Enable support for Advantech PCL-818 ISA cards PCL-818L, PCL-818H, PCL-818HD, PCL-818HG, PCL-818 and PCL-718 diff --git a/drivers/staging/comedi/drivers/pcl818.c b/drivers/staging/comedi/drivers/pcl818.c index 7e4cdea5fe59..8d933dcad533 100644 --- a/drivers/staging/comedi/drivers/pcl818.c +++ b/drivers/staging/comedi/drivers/pcl818.c @@ -101,7 +101,7 @@ #include "comedi_isadma.h" #include "comedi_fc.h" -#include "8253.h" +#include "comedi_8254.h" /* boards constants */ @@ -299,33 +299,15 @@ struct pcl818_private { struct comedi_isadma *dma; /* manimal allowed delay between samples (in us) for actual card */ unsigned int ns_min; - int i8253_osc_base; /* 1/frequency of on board oscilator in ns */ /* MUX setting for actual AI operations */ unsigned int act_chanlist[16]; unsigned int act_chanlist_len; /* how long is actual MUX list */ unsigned int act_chanlist_pos; /* actual position in MUX list */ - unsigned int divisor1; - unsigned int divisor2; unsigned int usefifo:1; unsigned int ai_cmd_running:1; unsigned int ai_cmd_canceled:1; }; -static void pcl818_start_pacer(struct comedi_device *dev, bool load_counters) -{ - struct pcl818_private *devpriv = dev->private; - unsigned long timer_base = dev->iobase + PCL818_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_counters) { - i8254_write(timer_base, 0, 2, devpriv->divisor2); - i8254_write(timer_base, 0, 1, devpriv->divisor1); - } -} - static void pcl818_ai_setup_dma(struct comedi_device *dev, struct comedi_subdevice *s, unsigned int unread_samples) @@ -663,9 +645,7 @@ static int ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, struct comedi_cmd *cmd) { const struct pcl818_board *board = dev->board_ptr; - struct pcl818_private *devpriv = dev->private; int err = 0; - unsigned int arg; /* Step 1 : check if triggers are trivially valid */ @@ -712,11 +692,9 @@ static int ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s, /* step 4: fix up any arguments */ if (cmd->convert_src == TRIG_TIMER) { - arg = cmd->convert_arg; - i8253_cascade_ns_to_timer(devpriv->i8253_osc_base, - &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); } @@ -746,8 +724,6 @@ static int pcl818_ai_cmd(struct comedi_device *dev, if (devpriv->ai_cmd_running) return -EBUSY; - pcl818_start_pacer(dev, false); - seglen = check_channel_list(dev, s, cmd->chanlist, cmd->chanlist_len); if (seglen < 1) return -EINVAL; @@ -779,8 +755,10 @@ static int pcl818_ai_cmd(struct comedi_device *dev, } outb(ctrl, dev->iobase + PCL818_CTRL_REG); - if (cmd->convert_src == TRIG_TIMER) - pcl818_start_pacer(dev, true); + if (cmd->convert_src == TRIG_TIMER) { + comedi_8254_update_divisors(dev->pacer); + comedi_8254_pacer_enable(dev->pacer, 1, 2, true); + } return 0; } @@ -812,7 +790,7 @@ static int pcl818_ai_cancel(struct comedi_device *dev, } outb(PCL818_CTRL_DISABLE_TRIG, dev->iobase + PCL818_CTRL_REG); - pcl818_start_pacer(dev, false); + comedi_8254_pacer_enable(dev->pacer, 1, 2, false); pcl818_ai_clear_eoc(dev); if (devpriv->usefifo) { /* FIFO shutdown */ @@ -906,7 +884,6 @@ static int pcl818_do_insn_bits(struct comedi_device *dev, static void pcl818_reset(struct comedi_device *dev) { const struct pcl818_board *board = dev->board_ptr; - unsigned long timer_base = dev->iobase + PCL818_TIMER_BASE; unsigned int chan; /* flush and disable the FIFO */ @@ -924,9 +901,6 @@ static void pcl818_reset(struct comedi_device *dev) /* stop pacer */ outb(PCL818_CNTENABLE_PACER_ENA, dev->iobase + PCL818_CNTENABLE_REG); - 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 analog output channels to 0V */ for (chan = 0; chan < board->n_aochan; chan++) { @@ -1016,6 +990,7 @@ static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it) const struct pcl818_board *board = dev->board_ptr; struct pcl818_private *devpriv; struct comedi_subdevice *s; + unsigned int osc_base; int ret; devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); @@ -1043,6 +1018,25 @@ static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it) if (dev->irq && board->has_dma) pcl818_alloc_dma(dev, it->options[2]); + /* use 1MHz or 10MHz oscilator */ + if ((it->options[3] == 0) || (it->options[3] == 10)) + osc_base = I8254_OSC_BASE_10MHZ; + else + osc_base = I8254_OSC_BASE_1MHZ; + + dev->pacer = comedi_8254_init(dev->iobase + PCL818_TIMER_BASE, + osc_base, I8254_IO8, 0); + if (!dev->pacer) + return -ENOMEM; + + /* max sampling speed */ + devpriv->ns_min = board->ns_min; + if (!board->is_818) { + /* extended PCL718 to 100kHz DAC */ + if ((it->options[6] == 1) || (it->options[6] == 100)) + devpriv->ns_min = 10000; + } + ret = comedi_alloc_subdevices(dev, 4); if (ret) return ret; @@ -1117,22 +1111,6 @@ static int pcl818_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->range_table = &range_digital; s->insn_bits = pcl818_do_insn_bits; - /* select 1/10MHz oscilator */ - if ((it->options[3] == 0) || (it->options[3] == 10)) - devpriv->i8253_osc_base = I8254_OSC_BASE_10MHZ; - else - devpriv->i8253_osc_base = I8254_OSC_BASE_1MHZ; - - /* max sampling speed */ - devpriv->ns_min = board->ns_min; - - if (!board->is_818) { - if ((it->options[6] == 1) || (it->options[6] == 100)) { - /* extended PCL718 to 100kHz DAC */ - devpriv->ns_min = 10000; - } - } - pcl818_reset(dev); return 0;