From aff0dff965604b22119b0c5fa7751dc78bf5d96a Mon Sep 17 00:00:00 2001 From: H Hartley Sweeten Date: Thu, 26 Feb 2015 15:43:55 -0700 Subject: [PATCH] staging: comedi: cb_pcimdas: add 8254 timer (pacer) support The hardware has an 8254 timer/counter. Channe; 0 is available as a generic counter/timer with the clock, gate, and output signals all availabe on the main 37 pin connector. Channels 1 and 2 are used for the pacer. Add 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/cb_pcimdas.c | 70 ++++++++++++++++++++- 2 files changed, 70 insertions(+), 1 deletion(-) diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig index 737994a82c62..61c6351f55ac 100644 --- a/drivers/staging/comedi/Kconfig +++ b/drivers/staging/comedi/Kconfig @@ -953,6 +953,7 @@ config COMEDI_CB_PCIDDA config COMEDI_CB_PCIMDAS tristate "MeasurementComputing PCIM-DAS1602/16, PCIe-DAS1602/16 support" + select COMEDI_8254 select COMEDI_8255 ---help--- Enable support for ComputerBoards/MeasurementComputing PCI Migration diff --git a/drivers/staging/comedi/drivers/cb_pcimdas.c b/drivers/staging/comedi/drivers/cb_pcimdas.c index cef6872e98b3..acb77406bce3 100644 --- a/drivers/staging/comedi/drivers/cb_pcimdas.c +++ b/drivers/staging/comedi/drivers/cb_pcimdas.c @@ -47,6 +47,7 @@ #include "../comedidev.h" +#include "comedi_8254.h" #include "plx9052.h" #include "8255.h" @@ -273,6 +274,57 @@ static int cb_pcimdas_do_insn_write(struct comedi_device *dev, return insn->n; } +static int cb_pcimdas_counter_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct cb_pcimdas_private *devpriv = dev->private; + unsigned int ctrl; + + switch (data[0]) { + case INSN_CONFIG_SET_CLOCK_SRC: + switch (data[1]) { + case 0: /* internal 100 kHz clock */ + ctrl = PCIMDAS_USER_CNTR_CTR1_CLK_SEL; + break; + case 1: /* external clk on pin 21 */ + ctrl = 0; + break; + default: + return -EINVAL; + } + outb(ctrl, devpriv->BADR3 + PCIMDAS_USER_CNTR_REG); + break; + case INSN_CONFIG_GET_CLOCK_SRC: + ctrl = inb(devpriv->BADR3 + PCIMDAS_USER_CNTR_REG); + if (ctrl & PCIMDAS_USER_CNTR_CTR1_CLK_SEL) { + data[1] = 0; + data[2] = I8254_OSC_BASE_100KHZ; + } else { + data[1] = 1; + data[2] = 0; + } + break; + default: + return -EINVAL; + } + + return insn->n; +} + +static unsigned int cb_pcimdas_pacer_clk(struct comedi_device *dev) +{ + struct cb_pcimdas_private *devpriv = dev->private; + unsigned int status; + + /* The Pacer Clock jumper selects a 10 MHz or 1 MHz clock */ + status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG); + if (status & PCIMDAS_STATUS_CLK) + return I8254_OSC_BASE_10MHZ; + return I8254_OSC_BASE_1MHZ; +} + static bool cb_pcimdas_is_ai_se(struct comedi_device *dev) { struct cb_pcimdas_private *devpriv = dev->private; @@ -321,7 +373,13 @@ static int cb_pcimdas_auto_attach(struct comedi_device *dev, devpriv->BADR3 = pci_resource_start(pcidev, 3); dev->iobase = pci_resource_start(pcidev, 4); - ret = comedi_alloc_subdevices(dev, 5); + dev->pacer = comedi_8254_init(devpriv->BADR3 + PCIMDAS_8254_BASE, + cb_pcimdas_pacer_clk(dev), + I8254_IO8, 0); + if (!dev->pacer) + return -ENOMEM; + + ret = comedi_alloc_subdevices(dev, 6); if (ret) return ret; @@ -378,6 +436,16 @@ static int cb_pcimdas_auto_attach(struct comedi_device *dev, s->range_table = &range_digital; s->insn_write = cb_pcimdas_do_insn_write; + /* Counter subdevice (8254) */ + s = &dev->subdevices[5]; + comedi_8254_subdevice_init(s, dev->pacer); + + dev->pacer->insn_config = cb_pcimdas_counter_insn_config; + + /* counters 1 and 2 are used internally for the pacer */ + comedi_8254_set_busy(dev->pacer, 1, true); + comedi_8254_set_busy(dev->pacer, 2, true); + return 0; } -- 2.39.5