--- /dev/null
+/*
+ comedi/drivers/das1800.c
+ Driver for Keitley das1700/das1800 series boards
+ Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
+
+ COMEDI - Linux Control and Measurement Device Interface
+ Copyright (C) 2000 David A. Schleef <ds@schleef.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+************************************************************************
+*/
+/*
+Driver: das1800
+Description: Keithley Metrabyte DAS1800 (& compatibles)
+Author: Frank Mori Hess <fmhess@users.sourceforge.net>
+Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st),
+ DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao),
+ DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da),
+ DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da),
+ DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st),
+ DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc),
+ DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st),
+ DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr),
+ DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc),
+ DAS-1802AO (das-1802ao)
+Status: works
+
+The waveform analog output on the 'ao' cards is not supported.
+If you need it, send me (Frank Hess) an email.
+
+Configuration options:
+ [0] - I/O port base address
+ [1] - IRQ (optional, required for timed or externally triggered conversions)
+ [2] - DMA0 (optional, requires irq)
+ [3] - DMA1 (optional, requires irq and dma0)
+*/
+/*
+
+This driver supports the following Keithley boards:
+
+das-1701st
+das-1701st-da
+das-1701ao
+das-1702st
+das-1702st-da
+das-1702hr
+das-1702hr-da
+das-1702ao
+das-1801st
+das-1801st-da
+das-1801hc
+das-1801ao
+das-1802st
+das-1802st-da
+das-1802hr
+das-1802hr-da
+das-1802hc
+das-1802ao
+
+Options:
+ [0] - base io address
+ [1] - irq (optional, required for timed or externally triggered conversions)
+ [2] - dma0 (optional, requires irq)
+ [3] - dma1 (optional, requires irq and dma0)
+
+irq can be omitted, although the cmd interface will not work without it.
+
+analog input cmd triggers supported:
+ start_src: TRIG_NOW | TRIG_EXT
+ scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT
+ scan_end_src: TRIG_COUNT
+ convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW)
+ stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE
+
+scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's
+'burst mode' which limits the valid conversion time to 64 microseconds
+(convert_arg <= 64000). This limitation does not apply if scan_begin_src
+is TRIG_FOLLOW.
+
+NOTES:
+Only the DAS-1801ST has been tested by me.
+Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
+
+TODO:
+ Make it automatically allocate irq and dma channels if they are not specified
+ Add support for analog out on 'ao' cards
+ read insn for analog out
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+#include <asm/dma.h>
+
+#include "8253.h"
+#include "comedi_fc.h"
+
+// misc. defines
+#define DAS1800_SIZE 16 //uses 16 io addresses
+#define FIFO_SIZE 1024 // 1024 sample fifo
+#define TIMER_BASE 200 // 5 Mhz master clock
+#define UNIPOLAR 0x4 // bit that determines whether input range is uni/bipolar
+#define DMA_BUF_SIZE 0x1ff00 // size in bytes of dma buffers
+
+/* Registers for the das1800 */
+#define DAS1800_FIFO 0x0
+#define DAS1800_QRAM 0x0
+#define DAS1800_DAC 0x0
+#define DAS1800_SELECT 0x2
+#define ADC 0x0
+#define QRAM 0x1
+#define DAC(a) (0x2 + a)
+#define DAS1800_DIGITAL 0x3
+#define DAS1800_CONTROL_A 0x4
+#define FFEN 0x1
+#define CGEN 0x4
+#define CGSL 0x8
+#define TGEN 0x10
+#define TGSL 0x20
+#define ATEN 0x80
+#define DAS1800_CONTROL_B 0x5
+#define DMA_CH5 0x1
+#define DMA_CH6 0x2
+#define DMA_CH7 0x3
+#define DMA_CH5_CH6 0x5
+#define DMA_CH6_CH7 0x6
+#define DMA_CH7_CH5 0x7
+#define DMA_ENABLED 0x3 //mask used to determine if dma is enabled
+#define DMA_DUAL 0x4
+#define IRQ3 0x8
+#define IRQ5 0x10
+#define IRQ7 0x18
+#define IRQ10 0x28
+#define IRQ11 0x30
+#define IRQ15 0x38
+#define FIMD 0x40
+#define DAS1800_CONTROL_C 0X6
+#define IPCLK 0x1
+#define XPCLK 0x3
+#define BMDE 0x4
+#define CMEN 0x8
+#define UQEN 0x10
+#define SD 0x40
+#define UB 0x80
+#define DAS1800_STATUS 0x7
+// bits that prevent interrupt status bits (and CVEN) from being cleared on write
+#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
+#define INT 0x1
+#define DMATC 0x2
+#define CT0TC 0x8
+#define OVF 0x10
+#define FHF 0x20
+#define FNE 0x40
+#define CVEN_MASK 0x40 // masks CVEN on write
+#define CVEN 0x80
+#define DAS1800_BURST_LENGTH 0x8
+#define DAS1800_BURST_RATE 0x9
+#define DAS1800_QRAM_ADDRESS 0xa
+#define DAS1800_COUNTER 0xc
+
+#define IOBASE2 0x400 //offset of additional ioports used on 'ao' cards
+
+enum {
+ das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
+ das1702hr_da,
+ das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
+ das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
+};
+
+static int das1800_attach(comedi_device * dev, comedi_devconfig * it);
+static int das1800_detach(comedi_device * dev);
+static int das1800_probe(comedi_device * dev);
+static int das1800_cancel(comedi_device * dev, comedi_subdevice * s);
+static irqreturn_t das1800_interrupt(int irq, void *d PT_REGS_ARG);
+static int das1800_ai_poll(comedi_device * dev, comedi_subdevice * s);
+static void das1800_ai_handler(comedi_device * dev);
+static void das1800_handle_dma(comedi_device * dev, comedi_subdevice * s,
+ unsigned int status);
+static void das1800_flush_dma(comedi_device * dev, comedi_subdevice * s);
+static void das1800_flush_dma_channel(comedi_device * dev, comedi_subdevice * s,
+ unsigned int channel, uint16_t * buffer);
+static void das1800_handle_fifo_half_full(comedi_device * dev,
+ comedi_subdevice * s);
+static void das1800_handle_fifo_not_empty(comedi_device * dev,
+ comedi_subdevice * s);
+static int das1800_ai_do_cmdtest(comedi_device * dev, comedi_subdevice * s,
+ comedi_cmd * cmd);
+static int das1800_ai_do_cmd(comedi_device * dev, comedi_subdevice * s);
+static int das1800_ai_rinsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data);
+static int das1800_ao_winsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data);
+static int das1800_di_rbits(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data);
+static int das1800_do_wbits(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data);
+
+static int das1800_set_frequency(comedi_device * dev);
+static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
+static unsigned int suggest_transfer_size(comedi_cmd * cmd);
+
+// analog input ranges
+static const comedi_lrange range_ai_das1801 = {
+ 8,
+ {
+ RANGE(-5, 5),
+ RANGE(-1, 1),
+ RANGE(-0.1, 0.1),
+ RANGE(-0.02, 0.02),
+ RANGE(0, 5),
+ RANGE(0, 1),
+ RANGE(0, 0.1),
+ RANGE(0, 0.02),
+ }
+};
+
+static const comedi_lrange range_ai_das1802 = {
+ 8,
+ {
+ RANGE(-10, 10),
+ RANGE(-5, 5),
+ RANGE(-2.5, 2.5),
+ RANGE(-1.25, 1.25),
+ RANGE(0, 10),
+ RANGE(0, 5),
+ RANGE(0, 2.5),
+ RANGE(0, 1.25),
+ }
+};
+
+typedef struct das1800_board_struct {
+ const char *name;
+ int ai_speed; /* max conversion period in nanoseconds */
+ int resolution; /* bits of ai resolution */
+ int qram_len; /* length of card's channel / gain queue */
+ int common; /* supports AREF_COMMON flag */
+ int do_n_chan; /* number of digital output channels */
+ int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
+ int ao_n_chan; /* number of analog out channels */
+ const comedi_lrange *range_ai; /* available input ranges */
+} das1800_board;
+
+/* Warning: the maximum conversion speeds listed below are
+ * not always achievable depending on board setup (see
+ * user manual.)
+ */
+static const das1800_board das1800_boards[] = {
+ {
+ name: "das-1701st",
+ ai_speed:6250,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:0,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1701st-da",
+ ai_speed:6250,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:1,
+ ao_n_chan:4,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1702st",
+ ai_speed:6250,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:0,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1702st-da",
+ ai_speed:6250,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:1,
+ ao_n_chan:4,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1702hr",
+ ai_speed:20000,
+ resolution:16,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:0,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1702hr-da",
+ ai_speed:20000,
+ resolution:16,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:1,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1701ao",
+ ai_speed:6250,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:2,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1702ao",
+ ai_speed:6250,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:2,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1801st",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:0,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1801st-da",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:4,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1802st",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:0,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1802st-da",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:1,
+ ao_n_chan:4,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1802hr",
+ ai_speed:10000,
+ resolution:16,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:0,
+ ao_n_chan:0,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1802hr-da",
+ ai_speed:10000,
+ resolution:16,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:1,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1801hc",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:64,
+ common: 0,
+ do_n_chan:8,
+ ao_ability:1,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1802hc",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:64,
+ common: 0,
+ do_n_chan:8,
+ ao_ability:1,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1802,
+ },
+ {
+ name: "das-1801ao",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:2,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1801,
+ },
+ {
+ name: "das-1802ao",
+ ai_speed:3000,
+ resolution:12,
+ qram_len:256,
+ common: 1,
+ do_n_chan:4,
+ ao_ability:2,
+ ao_n_chan:2,
+ range_ai:&range_ai_das1802,
+ },
+};
+
+/*
+ * Useful for shorthand access to the particular board structure
+ */
+#define thisboard ((const das1800_board *)dev->board_ptr)
+
+typedef struct {
+ volatile unsigned int count; /* number of data points left to be taken */
+ unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
+ unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
+ int do_bits; /* digital output bits */
+ int irq_dma_bits; /* bits for control register b */
+ /* dma bits for control register b, stored so that dma can be
+ * turned on and off */
+ int dma_bits;
+ unsigned int dma0; /* dma channels used */
+ unsigned int dma1;
+ volatile unsigned int dma_current; /* dma channel currently in use */
+ uint16_t *ai_buf0; /* pointers to dma buffers */
+ uint16_t *ai_buf1;
+ uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
+ unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
+ unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
+ short ao_update_bits; /* remembers the last write to the 'update' dac */
+} das1800_private;
+
+#define devpriv ((das1800_private *)dev->private)
+
+// analog out range for boards with basic analog out
+static const comedi_lrange range_ao_1 = {
+ 1,
+ {
+ RANGE(-10, 10),
+ }
+};
+
+// analog out range for 'ao' boards
+/*
+static const comedi_lrange range_ao_2 = {
+ 2,
+ {
+ RANGE(-10, 10),
+ RANGE(-5, 5),
+ }
+};
+*/
+
+static comedi_driver driver_das1800 = {
+ driver_name:"das1800",
+ module:THIS_MODULE,
+ attach:das1800_attach,
+ detach:das1800_detach,
+ num_names:sizeof(das1800_boards) / sizeof(das1800_board),
+ board_name:&das1800_boards[0].name,
+ offset:sizeof(das1800_board),
+};
+
+/*
+ * A convenient macro that defines init_module() and cleanup_module(),
+ * as necessary.
+ */
+COMEDI_INITCLEANUP(driver_das1800);
+
+static int das1800_init_dma(comedi_device * dev, unsigned int dma0,
+ unsigned int dma1)
+{
+ unsigned long flags;
+
+ // need an irq to do dma
+ if (dev->irq && dma0) {
+ //encode dma0 and dma1 into 2 digit hexadecimal for switch
+ switch ((dma0 & 0x7) | (dma1 << 4)) {
+ case 0x5: // dma0 == 5
+ devpriv->dma_bits |= DMA_CH5;
+ break;
+ case 0x6: // dma0 == 6
+ devpriv->dma_bits |= DMA_CH6;
+ break;
+ case 0x7: // dma0 == 7
+ devpriv->dma_bits |= DMA_CH7;
+ break;
+ case 0x65: // dma0 == 5, dma1 == 6
+ devpriv->dma_bits |= DMA_CH5_CH6;
+ break;
+ case 0x76: // dma0 == 6, dma1 == 7
+ devpriv->dma_bits |= DMA_CH6_CH7;
+ break;
+ case 0x57: // dma0 == 7, dma1 == 5
+ devpriv->dma_bits |= DMA_CH7_CH5;
+ break;
+ default:
+ printk(" only supports dma channels 5 through 7\n"
+ " Dual dma only allows the following combinations:\n"
+ " dma 5,6 / 6,7 / or 7,5\n");
+ return -EINVAL;
+ break;
+ }
+ if (request_dma(dma0, driver_das1800.driver_name)) {
+ printk(" failed to allocate dma channel %i\n", dma0);
+ return -EINVAL;
+ }
+ devpriv->dma0 = dma0;
+ devpriv->dma_current = dma0;
+ if (dma1) {
+ if (request_dma(dma1, driver_das1800.driver_name)) {
+ printk(" failed to allocate dma channel %i\n",
+ dma1);
+ return -EINVAL;
+ }
+ devpriv->dma1 = dma1;
+ }
+ devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
+ if (devpriv->ai_buf0 == NULL)
+ return -ENOMEM;
+ devpriv->dma_current_buf = devpriv->ai_buf0;
+ if (dma1) {
+ devpriv->ai_buf1 =
+ kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
+ if (devpriv->ai_buf1 == NULL)
+ return -ENOMEM;
+ }
+ flags = claim_dma_lock();
+ disable_dma(devpriv->dma0);
+ set_dma_mode(devpriv->dma0, DMA_MODE_READ);
+ if (dma1) {
+ disable_dma(devpriv->dma1);
+ set_dma_mode(devpriv->dma1, DMA_MODE_READ);
+ }
+ release_dma_lock(flags);
+ }
+ return 0;
+}
+
+static int das1800_attach(comedi_device * dev, comedi_devconfig * it)
+{
+ comedi_subdevice *s;
+ unsigned long iobase = it->options[0];
+ unsigned int irq = it->options[1];
+ unsigned int dma0 = it->options[2];
+ unsigned int dma1 = it->options[3];
+ unsigned long iobase2;
+ int board;
+ int retval;
+
+ /* allocate and initialize dev->private */
+ if (alloc_private(dev, sizeof(das1800_private)) < 0)
+ return -ENOMEM;
+
+ printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
+ iobase);
+ if (irq) {
+ printk(", irq %u", irq);
+ if (dma0) {
+ printk(", dma %u", dma0);
+ if (dma1)
+ printk(" and %u", dma1);
+ }
+ }
+ printk("\n");
+
+ if (iobase == 0) {
+ printk(" io base address required\n");
+ return -EINVAL;
+ }
+
+ /* check if io addresses are available */
+ if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
+ printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase, iobase + DAS1800_SIZE - 1);
+ return -EIO;
+ }
+ dev->iobase = iobase;
+
+ board = das1800_probe(dev);
+ if (board < 0) {
+ printk(" unable to determine board type\n");
+ return -ENODEV;
+ }
+
+ dev->board_ptr = das1800_boards + board;
+ dev->board_name = thisboard->name;
+
+ // if it is an 'ao' board with fancy analog out then we need extra io ports
+ if (thisboard->ao_ability == 2) {
+ iobase2 = iobase + IOBASE2;
+ if (!request_region(iobase2, DAS1800_SIZE,
+ driver_das1800.driver_name)) {
+ printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase2, iobase2 + DAS1800_SIZE - 1);
+ return -EIO;
+ }
+ devpriv->iobase2 = iobase2;
+ }
+
+ /* grab our IRQ */
+ if (irq) {
+ if (comedi_request_irq(irq, das1800_interrupt, 0,
+ driver_das1800.driver_name, dev)) {
+ printk(" unable to allocate irq %u\n", irq);
+ return -EINVAL;
+ }
+ }
+ dev->irq = irq;
+
+ // set bits that tell card which irq to use
+ switch (irq) {
+ case 0:
+ break;
+ case 3:
+ devpriv->irq_dma_bits |= 0x8;
+ break;
+ case 5:
+ devpriv->irq_dma_bits |= 0x10;
+ break;
+ case 7:
+ devpriv->irq_dma_bits |= 0x18;
+ break;
+ case 10:
+ devpriv->irq_dma_bits |= 0x28;
+ break;
+ case 11:
+ devpriv->irq_dma_bits |= 0x30;
+ break;
+ case 15:
+ devpriv->irq_dma_bits |= 0x38;
+ break;
+ default:
+ printk(" irq out of range\n");
+ return -EINVAL;
+ break;
+ }
+
+ retval = das1800_init_dma(dev, dma0, dma1);
+ if (retval < 0)
+ return retval;
+
+ if (devpriv->ai_buf0 == NULL) {
+ devpriv->ai_buf0 =
+ kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
+ if (devpriv->ai_buf0 == NULL)
+ return -ENOMEM;
+ }
+
+ if (alloc_subdevices(dev, 4) < 0)
+ return -ENOMEM;
+
+ /* analog input subdevice */
+ s = dev->subdevices + 0;
+ dev->read_subdev = s;
+ s->type = COMEDI_SUBD_AI;
+ s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
+ if (thisboard->common)
+ s->subdev_flags |= SDF_COMMON;
+ s->n_chan = thisboard->qram_len;
+ s->len_chanlist = thisboard->qram_len;
+ s->maxdata = (1 << thisboard->resolution) - 1;
+ s->range_table = thisboard->range_ai;
+ s->do_cmd = das1800_ai_do_cmd;
+ s->do_cmdtest = das1800_ai_do_cmdtest;
+ s->insn_read = das1800_ai_rinsn;
+ s->poll = das1800_ai_poll;
+ s->cancel = das1800_cancel;
+
+ /* analog out */
+ s = dev->subdevices + 1;
+ if (thisboard->ao_ability == 1) {
+ s->type = COMEDI_SUBD_AO;
+ s->subdev_flags = SDF_WRITABLE;
+ s->n_chan = thisboard->ao_n_chan;
+ s->maxdata = (1 << thisboard->resolution) - 1;
+ s->range_table = &range_ao_1;
+ s->insn_write = das1800_ao_winsn;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ /* di */
+ s = dev->subdevices + 2;
+ s->type = COMEDI_SUBD_DI;
+ s->subdev_flags = SDF_READABLE;
+ s->n_chan = 4;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_bits = das1800_di_rbits;
+
+ /* do */
+ s = dev->subdevices + 3;
+ s->type = COMEDI_SUBD_DO;
+ s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
+ s->n_chan = thisboard->do_n_chan;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->insn_bits = das1800_do_wbits;
+
+ das1800_cancel(dev, dev->read_subdev);
+
+ // initialize digital out channels
+ outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
+
+ // initialize analog out channels
+ if (thisboard->ao_ability == 1) {
+ // select 'update' dac channel for baseAddress + 0x0
+ outb(DAC(thisboard->ao_n_chan - 1),
+ dev->iobase + DAS1800_SELECT);
+ outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
+ }
+
+ return 0;
+};
+
+static int das1800_detach(comedi_device * dev)
+{
+ /* only free stuff if it has been allocated by _attach */
+ if (dev->iobase)
+ release_region(dev->iobase, DAS1800_SIZE);
+ if (dev->irq)
+ comedi_free_irq(dev->irq, dev);
+ if (dev->private) {
+ if (devpriv->iobase2)
+ release_region(devpriv->iobase2, DAS1800_SIZE);
+ if (devpriv->dma0)
+ free_dma(devpriv->dma0);
+ if (devpriv->dma1)
+ free_dma(devpriv->dma1);
+ if (devpriv->ai_buf0)
+ kfree(devpriv->ai_buf0);
+ if (devpriv->ai_buf1)
+ kfree(devpriv->ai_buf1);
+ }
+
+ printk("comedi%d: %s: remove\n", dev->minor,
+ driver_das1800.driver_name);
+
+ return 0;
+};
+
+/* probes and checks das-1800 series board type
+ */
+static int das1800_probe(comedi_device * dev)
+{
+ int id;
+ int board;
+
+ id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
+ board = ((das1800_board *) dev->board_ptr) - das1800_boards;
+
+ switch (id) {
+ case 0x3:
+ if (board == das1801st_da || board == das1802st_da ||
+ board == das1701st_da || board == das1702st_da) {
+ printk(" Board model: %s\n",
+ das1800_boards[board].name);
+ return board;
+ }
+ printk(" Board model (probed, not recommended): das-1800st-da series\n");
+ return das1801st;
+ break;
+ case 0x4:
+ if (board == das1802hr_da || board == das1702hr_da) {
+ printk(" Board model: %s\n",
+ das1800_boards[board].name);
+ return board;
+ }
+ printk(" Board model (probed, not recommended): das-1802hr-da\n");
+ return das1802hr;
+ break;
+ case 0x5:
+ if (board == das1801ao || board == das1802ao ||
+ board == das1701ao || board == das1702ao) {
+ printk(" Board model: %s\n",
+ das1800_boards[board].name);
+ return board;
+ }
+ printk(" Board model (probed, not recommended): das-1800ao series\n");
+ return das1801ao;
+ break;
+ case 0x6:
+ if (board == das1802hr || board == das1702hr) {
+ printk(" Board model: %s\n",
+ das1800_boards[board].name);
+ return board;
+ }
+ printk(" Board model (probed, not recommended): das-1802hr\n");
+ return das1802hr;
+ break;
+ case 0x7:
+ if (board == das1801st || board == das1802st ||
+ board == das1701st || board == das1702st) {
+ printk(" Board model: %s\n",
+ das1800_boards[board].name);
+ return board;
+ }
+ printk(" Board model (probed, not recommended): das-1800st series\n");
+ return das1801st;
+ break;
+ case 0x8:
+ if (board == das1801hc || board == das1802hc) {
+ printk(" Board model: %s\n",
+ das1800_boards[board].name);
+ return board;
+ }
+ printk(" Board model (probed, not recommended): das-1800hc series\n");
+ return das1801hc;
+ break;
+ default:
+ printk(" Board model: probe returned 0x%x (unknown, please report)\n", id);
+ return board;
+ break;
+ }
+ return -1;
+}
+
+static int das1800_ai_poll(comedi_device * dev, comedi_subdevice * s)
+{
+ unsigned long flags;
+
+ // prevent race with interrupt handler
+ comedi_spin_lock_irqsave(&dev->spinlock, flags);
+ das1800_ai_handler(dev);
+ comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
+
+ return s->async->buf_write_count - s->async->buf_read_count;
+}
+
+static irqreturn_t das1800_interrupt(int irq, void *d PT_REGS_ARG)
+{
+ comedi_device *dev = d;
+ unsigned int status;
+
+ if (dev->attached == 0) {
+ comedi_error(dev, "premature interrupt");
+ return IRQ_HANDLED;
+ }
+
+ /* Prevent race with das1800_ai_poll() on multi processor systems.
+ * Also protects indirect addressing in das1800_ai_handler */
+ spin_lock(&dev->spinlock);
+ status = inb(dev->iobase + DAS1800_STATUS);
+
+ /* if interrupt was not caused by das-1800 */
+ if (!(status & INT)) {
+ spin_unlock(&dev->spinlock);
+ return IRQ_NONE;
+ }
+ /* clear the interrupt status bit INT */
+ outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
+ // handle interrupt
+ das1800_ai_handler(dev);
+
+ spin_unlock(&dev->spinlock);
+ return IRQ_HANDLED;
+}
+
+// the guts of the interrupt handler, that is shared with das1800_ai_poll
+static void das1800_ai_handler(comedi_device * dev)
+{
+ comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
+ comedi_async *async = s->async;
+ comedi_cmd *cmd = &async->cmd;
+ unsigned int status = inb(dev->iobase + DAS1800_STATUS);
+
+ async->events = 0;
+ // select adc for base address + 0
+ outb(ADC, dev->iobase + DAS1800_SELECT);
+ // dma buffer full
+ if (devpriv->irq_dma_bits & DMA_ENABLED) {
+ // look for data from dma transfer even if dma terminal count hasn't happened yet
+ das1800_handle_dma(dev, s, status);
+ } else if (status & FHF) { // if fifo half full
+ das1800_handle_fifo_half_full(dev, s);
+ } else if (status & FNE) { // if fifo not empty
+ das1800_handle_fifo_not_empty(dev, s);
+ }
+
+ async->events |= COMEDI_CB_BLOCK;
+ /* if the card's fifo has overflowed */
+ if (status & OVF) {
+ // clear OVF interrupt bit
+ outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
+ comedi_error(dev, "DAS1800 FIFO overflow");
+ das1800_cancel(dev, s);
+ async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
+ comedi_event(dev, s);
+ return;
+ }
+ // stop taking data if appropriate
+ /* stop_src TRIG_EXT */
+ if (status & CT0TC) {
+ // clear CT0TC interrupt bit
+ outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
+ // make sure we get all remaining data from board before quitting
+ if (devpriv->irq_dma_bits & DMA_ENABLED)
+ das1800_flush_dma(dev, s);
+ else
+ das1800_handle_fifo_not_empty(dev, s);
+ das1800_cancel(dev, s); /* disable hardware conversions */
+ async->events |= COMEDI_CB_EOA;
+ } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { // stop_src TRIG_COUNT
+ das1800_cancel(dev, s); /* disable hardware conversions */
+ async->events |= COMEDI_CB_EOA;
+ }
+
+ comedi_event(dev, s);
+
+ return;
+}
+
+static void das1800_handle_dma(comedi_device * dev, comedi_subdevice * s,
+ unsigned int status)
+{
+ unsigned long flags;
+ const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
+
+ flags = claim_dma_lock();
+ das1800_flush_dma_channel(dev, s, devpriv->dma_current,
+ devpriv->dma_current_buf);
+ // re-enable dma channel
+ set_dma_addr(devpriv->dma_current,
+ virt_to_bus(devpriv->dma_current_buf));
+ set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
+ enable_dma(devpriv->dma_current);
+ release_dma_lock(flags);
+
+ if (status & DMATC) {
+ // clear DMATC interrupt bit
+ outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
+ // switch dma channels for next time, if appropriate
+ if (dual_dma) {
+ // read data from the other channel next time
+ if (devpriv->dma_current == devpriv->dma0) {
+ devpriv->dma_current = devpriv->dma1;
+ devpriv->dma_current_buf = devpriv->ai_buf1;
+ } else {
+ devpriv->dma_current = devpriv->dma0;
+ devpriv->dma_current_buf = devpriv->ai_buf0;
+ }
+ }
+ }
+
+ return;
+}
+
+static inline uint16_t munge_bipolar_sample(const comedi_device * dev,
+ uint16_t sample)
+{
+ sample += 1 << (thisboard->resolution - 1);
+ return sample;
+}
+
+static void munge_data(comedi_device * dev, uint16_t * array,
+ unsigned int num_elements)
+{
+ unsigned int i;
+ int unipolar;
+
+ /* see if card is using a unipolar or bipolar range so we can munge data correctly */
+ unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
+
+ /* convert to unsigned type if we are in a bipolar mode */
+ if (!unipolar) {
+ for (i = 0; i < num_elements; i++) {
+ array[i] = munge_bipolar_sample(dev, array[i]);
+ }
+ }
+}
+
+/* Utility function used by das1800_flush_dma() and das1800_handle_dma().
+ * Assumes dma lock is held */
+static void das1800_flush_dma_channel(comedi_device * dev, comedi_subdevice * s,
+ unsigned int channel, uint16_t * buffer)
+{
+ unsigned int num_bytes, num_samples;
+ comedi_cmd *cmd = &s->async->cmd;
+
+ disable_dma(channel);
+
+ /* clear flip-flop to make sure 2-byte registers
+ * get set correctly */
+ clear_dma_ff(channel);
+
+ // figure out how many points to read
+ num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
+ num_samples = num_bytes / sizeof(sampl_t);
+
+ /* if we only need some of the points */
+ if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
+ num_samples = devpriv->count;
+
+ munge_data(dev, buffer, num_samples);
+ cfc_write_array_to_buffer(s, buffer, num_bytes);
+ if (s->async->cmd.stop_src == TRIG_COUNT)
+ devpriv->count -= num_samples;
+
+ return;
+}
+
+/* flushes remaining data from board when external trigger has stopped aquisition
+ * and we are using dma transfers */
+static void das1800_flush_dma(comedi_device * dev, comedi_subdevice * s)
+{
+ unsigned long flags;
+ const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
+
+ flags = claim_dma_lock();
+ das1800_flush_dma_channel(dev, s, devpriv->dma_current,
+ devpriv->dma_current_buf);
+
+ if (dual_dma) {
+ // switch to other channel and flush it
+ if (devpriv->dma_current == devpriv->dma0) {
+ devpriv->dma_current = devpriv->dma1;
+ devpriv->dma_current_buf = devpriv->ai_buf1;
+ } else {
+ devpriv->dma_current = devpriv->dma0;
+ devpriv->dma_current_buf = devpriv->ai_buf0;
+ }
+ das1800_flush_dma_channel(dev, s, devpriv->dma_current,
+ devpriv->dma_current_buf);
+ }
+
+ release_dma_lock(flags);
+
+ // get any remaining samples in fifo
+ das1800_handle_fifo_not_empty(dev, s);
+
+ return;
+}
+
+static void das1800_handle_fifo_half_full(comedi_device * dev,
+ comedi_subdevice * s)
+{
+ int numPoints = 0; /* number of points to read */
+ comedi_cmd *cmd = &s->async->cmd;
+
+ numPoints = FIFO_SIZE / 2;
+ /* if we only need some of the points */
+ if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
+ numPoints = devpriv->count;
+ insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
+ munge_data(dev, devpriv->ai_buf0, numPoints);
+ cfc_write_array_to_buffer(s, devpriv->ai_buf0,
+ numPoints * sizeof(devpriv->ai_buf0[0]));
+ if (cmd->stop_src == TRIG_COUNT)
+ devpriv->count -= numPoints;
+ return;
+}
+
+static void das1800_handle_fifo_not_empty(comedi_device * dev,
+ comedi_subdevice * s)
+{
+ sampl_t dpnt;
+ int unipolar;
+ comedi_cmd *cmd = &s->async->cmd;
+
+ unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
+
+ while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
+ if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
+ break;
+ dpnt = inw(dev->iobase + DAS1800_FIFO);
+ /* convert to unsigned type if we are in a bipolar mode */
+ if (!unipolar) ;
+ dpnt = munge_bipolar_sample(dev, dpnt);
+ cfc_write_to_buffer(s, dpnt);
+ if (cmd->stop_src == TRIG_COUNT)
+ devpriv->count--;
+ }
+
+ return;
+}
+
+static int das1800_cancel(comedi_device * dev, comedi_subdevice * s)
+{
+ outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
+ outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
+ outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
+ if (devpriv->dma0)
+ disable_dma(devpriv->dma0);
+ if (devpriv->dma1)
+ disable_dma(devpriv->dma1);
+ return 0;
+}
+
+/* test analog input cmd */
+static int das1800_ai_do_cmdtest(comedi_device * dev, comedi_subdevice * s,
+ comedi_cmd * cmd)
+{
+ int err = 0;
+ int tmp;
+ unsigned int tmp_arg;
+ int i;
+ int unipolar;
+
+ /* step 1: make sure trigger sources are trivially valid */
+
+ tmp = cmd->start_src;
+ cmd->start_src &= TRIG_NOW | TRIG_EXT;
+ if (!cmd->start_src || tmp != cmd->start_src)
+ err++;
+
+ tmp = cmd->scan_begin_src;
+ cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
+ if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
+ err++;
+
+ tmp = cmd->convert_src;
+ cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
+ if (!cmd->convert_src || tmp != cmd->convert_src)
+ err++;
+
+ tmp = cmd->scan_end_src;
+ cmd->scan_end_src &= TRIG_COUNT;
+ if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
+ err++;
+
+ tmp = cmd->stop_src;
+ cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
+ if (!cmd->stop_src || tmp != cmd->stop_src)
+ err++;
+
+ if (err)
+ return 1;
+
+ /* step 2: make sure trigger sources are unique and mutually compatible */
+
+ // uniqueness check
+ if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
+ err++;
+ if (cmd->scan_begin_src != TRIG_FOLLOW &&
+ cmd->scan_begin_src != TRIG_TIMER &&
+ cmd->scan_begin_src != TRIG_EXT)
+ err++;
+ if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
+ err++;
+ if (cmd->stop_src != TRIG_COUNT &&
+ cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
+ err++;
+ //compatibility check
+ if (cmd->scan_begin_src != TRIG_FOLLOW &&
+ cmd->convert_src != TRIG_TIMER)
+ err++;
+
+ if (err)
+ return 2;
+
+ /* step 3: make sure arguments are trivially compatible */
+
+ if (cmd->start_arg != 0) {
+ cmd->start_arg = 0;
+ err++;
+ }
+ if (cmd->convert_src == TRIG_TIMER) {
+ if (cmd->convert_arg < thisboard->ai_speed) {
+ cmd->convert_arg = thisboard->ai_speed;
+ err++;
+ }
+ }
+ if (!cmd->chanlist_len) {
+ cmd->chanlist_len = 1;
+ err++;
+ }
+ if (cmd->scan_end_arg != cmd->chanlist_len) {
+ cmd->scan_end_arg = cmd->chanlist_len;
+ err++;
+ }
+
+ switch (cmd->stop_src) {
+ case TRIG_COUNT:
+ if (!cmd->stop_arg) {
+ cmd->stop_arg = 1;
+ err++;
+ }
+ break;
+ case TRIG_NONE:
+ if (cmd->stop_arg != 0) {
+ cmd->stop_arg = 0;
+ err++;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (err)
+ return 3;
+
+ /* step 4: fix up any arguments */
+
+ if (cmd->convert_src == TRIG_TIMER) {
+ // if we are not in burst mode
+ if (cmd->scan_begin_src == TRIG_FOLLOW) {
+ tmp_arg = cmd->convert_arg;
+ /* calculate counter values that give desired timing */
+ i8253_cascade_ns_to_timer_2div(TIMER_BASE,
+ &(devpriv->divisor1), &(devpriv->divisor2),
+ &(cmd->convert_arg),
+ cmd->flags & TRIG_ROUND_MASK);
+ if (tmp_arg != cmd->convert_arg)
+ err++;
+ }
+ // if we are in burst mode
+ else {
+ // check that convert_arg is compatible
+ tmp_arg = cmd->convert_arg;
+ cmd->convert_arg =
+ burst_convert_arg(cmd->convert_arg,
+ cmd->flags & TRIG_ROUND_MASK);
+ if (tmp_arg != cmd->convert_arg)
+ err++;
+
+ if (cmd->scan_begin_src == TRIG_TIMER) {
+ // if scans are timed faster than conversion rate allows
+ if (cmd->convert_arg * cmd->chanlist_len >
+ cmd->scan_begin_arg) {
+ cmd->scan_begin_arg =
+ cmd->convert_arg *
+ cmd->chanlist_len;
+ err++;
+ }
+ tmp_arg = cmd->scan_begin_arg;
+ /* calculate counter values that give desired timing */
+ i8253_cascade_ns_to_timer_2div(TIMER_BASE,
+ &(devpriv->divisor1),
+ &(devpriv->divisor2),
+ &(cmd->scan_begin_arg),
+ cmd->flags & TRIG_ROUND_MASK);
+ if (tmp_arg != cmd->scan_begin_arg)
+ err++;
+ }
+ }
+ }
+
+ if (err)
+ return 4;
+
+ // make sure user is not trying to mix unipolar and bipolar ranges
+ if (cmd->chanlist) {
+ unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
+ for (i = 1; i < cmd->chanlist_len; i++) {
+ if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
+ comedi_error(dev,
+ "unipolar and bipolar ranges cannot be mixed in the chanlist");
+ err++;
+ break;
+ }
+ }
+ }
+
+ if (err)
+ return 5;
+
+ return 0;
+}
+
+/* analog input cmd interface */
+
+// first, some utility functions used in the main ai_do_cmd()
+
+// returns appropriate bits for control register a, depending on command
+static int control_a_bits(comedi_cmd cmd)
+{
+ int control_a;
+
+ control_a = FFEN; //enable fifo
+ if (cmd.stop_src == TRIG_EXT) {
+ control_a |= ATEN;
+ }
+ switch (cmd.start_src) {
+ case TRIG_EXT:
+ control_a |= TGEN | CGSL;
+ break;
+ case TRIG_NOW:
+ control_a |= CGEN;
+ break;
+ default:
+ break;
+ }
+
+ return control_a;
+}
+
+// returns appropriate bits for control register c, depending on command
+static int control_c_bits(comedi_cmd cmd)
+{
+ int control_c;
+ int aref;
+
+ /* set clock source to internal or external, select analog reference,
+ * select unipolar / bipolar
+ */
+ aref = CR_AREF(cmd.chanlist[0]);
+ control_c = UQEN; //enable upper qram addresses
+ if (aref != AREF_DIFF)
+ control_c |= SD;
+ if (aref == AREF_COMMON)
+ control_c |= CMEN;
+ /* if a unipolar range was selected */
+ if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
+ control_c |= UB;
+ switch (cmd.scan_begin_src) {
+ case TRIG_FOLLOW: // not in burst mode
+ switch (cmd.convert_src) {
+ case TRIG_TIMER:
+ /* trig on cascaded counters */
+ control_c |= IPCLK;
+ break;
+ case TRIG_EXT:
+ /* trig on falling edge of external trigger */
+ control_c |= XPCLK;
+ break;
+ default:
+ break;
+ }
+ break;
+ case TRIG_TIMER:
+ // burst mode with internal pacer clock
+ control_c |= BMDE | IPCLK;
+ break;
+ case TRIG_EXT:
+ // burst mode with external trigger
+ control_c |= BMDE | XPCLK;
+ break;
+ default:
+ break;
+ }
+
+ return control_c;
+}
+
+// sets up counters
+static int setup_counters(comedi_device * dev, comedi_cmd cmd)
+{
+ // setup cascaded counters for conversion/scan frequency
+ switch (cmd.scan_begin_src) {
+ case TRIG_FOLLOW: // not in burst mode
+ if (cmd.convert_src == TRIG_TIMER) {
+ /* set conversion frequency */
+ i8253_cascade_ns_to_timer_2div(TIMER_BASE,
+ &(devpriv->divisor1), &(devpriv->divisor2),
+ &(cmd.convert_arg),
+ cmd.flags & TRIG_ROUND_MASK);
+ if (das1800_set_frequency(dev) < 0) {
+ return -1;
+ }
+ }
+ break;
+ case TRIG_TIMER: // in burst mode
+ /* set scan frequency */
+ i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
+ &(devpriv->divisor2), &(cmd.scan_begin_arg),
+ cmd.flags & TRIG_ROUND_MASK);
+ if (das1800_set_frequency(dev) < 0) {
+ return -1;
+ }
+ break;
+ default:
+ break;
+ }
+
+ // setup counter 0 for 'about triggering'
+ if (cmd.stop_src == TRIG_EXT) {
+ // load counter 0 in mode 0
+ i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
+ }
+
+ return 0;
+}
+
+// sets up dma
+static void setup_dma(comedi_device * dev, comedi_cmd cmd)
+{
+ unsigned long lock_flags;
+ const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
+
+ if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
+ return;
+
+ /* determine a reasonable dma transfer size */
+ devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
+ lock_flags = claim_dma_lock();
+ disable_dma(devpriv->dma0);
+ /* clear flip-flop to make sure 2-byte registers for
+ * count and address get set correctly */
+ clear_dma_ff(devpriv->dma0);
+ set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
+ // set appropriate size of transfer
+ set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
+ devpriv->dma_current = devpriv->dma0;
+ devpriv->dma_current_buf = devpriv->ai_buf0;
+ enable_dma(devpriv->dma0);
+ // set up dual dma if appropriate
+ if (dual_dma) {
+ disable_dma(devpriv->dma1);
+ /* clear flip-flop to make sure 2-byte registers for
+ * count and address get set correctly */
+ clear_dma_ff(devpriv->dma1);
+ set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
+ // set appropriate size of transfer
+ set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
+ enable_dma(devpriv->dma1);
+ }
+ release_dma_lock(lock_flags);
+
+ return;
+}
+
+// programs channel/gain list into card
+static void program_chanlist(comedi_device * dev, comedi_cmd cmd)
+{
+ int i, n, chan_range;
+ unsigned long irq_flags;
+ const int range_mask = 0x3; //masks unipolar/bipolar bit off range
+ const int range_bitshift = 8;
+
+ n = cmd.chanlist_len;
+ // spinlock protects indirect addressing
+ comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
+ outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
+ outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
+ /* make channel / gain list */
+ for (i = 0; i < n; i++) {
+ chan_range =
+ CR_CHAN(cmd.chanlist[i]) | ((CR_RANGE(cmd.
+ chanlist[i]) & range_mask) <<
+ range_bitshift);
+ outw(chan_range, dev->iobase + DAS1800_QRAM);
+ }
+ outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
+ comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags);
+
+ return;
+}
+
+// analog input do_cmd
+static int das1800_ai_do_cmd(comedi_device * dev, comedi_subdevice * s)
+{
+ int ret;
+ int control_a, control_c;
+ comedi_async *async = s->async;
+ comedi_cmd cmd = async->cmd;
+
+ if (!dev->irq) {
+ comedi_error(dev,
+ "no irq assigned for das-1800, cannot do hardware conversions");
+ return -1;
+ }
+
+ /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
+ * (because dma in handler is unsafe at hard real-time priority) */
+ if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
+ devpriv->irq_dma_bits &= ~DMA_ENABLED;
+ } else {
+ devpriv->irq_dma_bits |= devpriv->dma_bits;
+ }
+ // interrupt on end of conversion for TRIG_WAKE_EOS
+ if (cmd.flags & TRIG_WAKE_EOS) {
+ // interrupt fifo not empty
+ devpriv->irq_dma_bits &= ~FIMD;
+ } else {
+ // interrupt fifo half full
+ devpriv->irq_dma_bits |= FIMD;
+ }
+ // determine how many conversions we need
+ if (cmd.stop_src == TRIG_COUNT) {
+ devpriv->count = cmd.stop_arg * cmd.chanlist_len;
+ }
+
+ das1800_cancel(dev, s);
+
+ // determine proper bits for control registers
+ control_a = control_a_bits(cmd);
+ control_c = control_c_bits(cmd);
+
+ /* setup card and start */
+ program_chanlist(dev, cmd);
+ ret = setup_counters(dev, cmd);
+ if (ret < 0) {
+ comedi_error(dev, "Error setting up counters");
+ return ret;
+ }
+ setup_dma(dev, cmd);
+ outb(control_c, dev->iobase + DAS1800_CONTROL_C);
+ // set conversion rate and length for burst mode
+ if (control_c & BMDE) {
+ // program conversion period with number of microseconds minus 1
+ outb(cmd.convert_arg / 1000 - 1,
+ dev->iobase + DAS1800_BURST_RATE);
+ outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
+ }
+ outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); // enable irq/dma
+ outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
+ outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
+
+ return 0;
+}
+
+/* read analog input */
+static int das1800_ai_rinsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ int i, n;
+ int chan, range, aref, chan_range;
+ int timeout = 1000;
+ short dpnt;
+ int conv_flags = 0;
+ unsigned long irq_flags;
+
+ /* set up analog reference and unipolar / bipolar mode */
+ aref = CR_AREF(insn->chanspec);
+ conv_flags |= UQEN;
+ if (aref != AREF_DIFF)
+ conv_flags |= SD;
+ if (aref == AREF_COMMON)
+ conv_flags |= CMEN;
+ /* if a unipolar range was selected */
+ if (CR_RANGE(insn->chanspec) & UNIPOLAR)
+ conv_flags |= UB;
+
+ outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
+ outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
+ outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
+ outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
+
+ chan = CR_CHAN(insn->chanspec);
+ /* mask of unipolar/bipolar bit from range */
+ range = CR_RANGE(insn->chanspec) & 0x3;
+ chan_range = chan | (range << 8);
+ comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
+ outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
+ outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
+ outw(chan_range, dev->iobase + DAS1800_QRAM);
+ outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
+ outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
+
+ for (n = 0; n < insn->n; n++) {
+ /* trigger conversion */
+ outb(0, dev->iobase + DAS1800_FIFO);
+ for (i = 0; i < timeout; i++) {
+ if (inb(dev->iobase + DAS1800_STATUS) & FNE)
+ break;
+ }
+ if (i == timeout) {
+ comedi_error(dev, "timeout");
+ return -ETIME;
+ }
+ dpnt = inw(dev->iobase + DAS1800_FIFO);
+ /* shift data to offset binary for bipolar ranges */
+ if ((conv_flags & UB) == 0)
+ dpnt += 1 << (thisboard->resolution - 1);
+ data[n] = dpnt;
+ }
+ comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags);
+
+ return n;
+}
+
+/* writes to an analog output channel */
+static int das1800_ao_winsn(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ int chan = CR_CHAN(insn->chanspec);
+// int range = CR_RANGE(insn->chanspec);
+ int update_chan = thisboard->ao_n_chan - 1;
+ short output;
+ unsigned long irq_flags;
+
+ // card expects two's complement data
+ output = data[0] - (1 << (thisboard->resolution - 1));
+ // if the write is to the 'update' channel, we need to remember its value
+ if (chan == update_chan)
+ devpriv->ao_update_bits = output;
+ // write to channel
+ comedi_spin_lock_irqsave(&dev->spinlock, irq_flags);
+ outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
+ outw(output, dev->iobase + DAS1800_DAC);
+ // now we need to write to 'update' channel to update all dac channels
+ if (chan != update_chan) {
+ outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
+ outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
+ }
+ comedi_spin_unlock_irqrestore(&dev->spinlock, irq_flags);
+
+ return 1;
+}
+
+/* reads from digital input channels */
+static int das1800_di_rbits(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+
+ data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
+ data[0] = 0;
+
+ return 2;
+}
+
+/* writes to digital output channels */
+static int das1800_do_wbits(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ lsampl_t wbits;
+
+ // only set bits that have been masked
+ data[0] &= (1 << s->n_chan) - 1;
+ wbits = devpriv->do_bits;
+ wbits &= ~data[0];
+ wbits |= data[0] & data[1];
+ devpriv->do_bits = wbits;
+
+ outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
+
+ data[1] = devpriv->do_bits;
+
+ return 2;
+}
+
+/* loads counters with divisor1, divisor2 from private structure */
+static int das1800_set_frequency(comedi_device * dev)
+{
+ int err = 0;
+
+ // counter 1, mode 2
+ if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
+ 2))
+ err++;
+ // counter 2, mode 2
+ if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
+ 2))
+ err++;
+ if (err)
+ return -1;
+
+ return 0;
+}
+
+/* converts requested conversion timing to timing compatible with
+ * hardware, used only when card is in 'burst mode'
+ */
+static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
+{
+ unsigned int micro_sec;
+
+ // in burst mode, the maximum conversion time is 64 microseconds
+ if (convert_arg > 64000)
+ convert_arg = 64000;
+
+ // the conversion time must be an integral number of microseconds
+ switch (round_mode) {
+ case TRIG_ROUND_NEAREST:
+ default:
+ micro_sec = (convert_arg + 500) / 1000;
+ break;
+ case TRIG_ROUND_DOWN:
+ micro_sec = convert_arg / 1000;
+ break;
+ case TRIG_ROUND_UP:
+ micro_sec = (convert_arg - 1) / 1000 + 1;
+ break;
+ }
+
+ // return number of nanoseconds
+ return micro_sec * 1000;
+}
+
+// utility function that suggests a dma transfer size based on the conversion period 'ns'
+static unsigned int suggest_transfer_size(comedi_cmd * cmd)
+{
+ unsigned int size = DMA_BUF_SIZE;
+ static const int sample_size = 2; // size in bytes of one sample from board
+ unsigned int fill_time = 300000000; // target time in nanoseconds for filling dma buffer
+ unsigned int max_size; // maximum size we will allow for a transfer
+
+ // make dma buffer fill in 0.3 seconds for timed modes
+ switch (cmd->scan_begin_src) {
+ case TRIG_FOLLOW: // not in burst mode
+ if (cmd->convert_src == TRIG_TIMER)
+ size = (fill_time / cmd->convert_arg) * sample_size;
+ break;
+ case TRIG_TIMER:
+ size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
+ sample_size;
+ break;
+ default:
+ size = DMA_BUF_SIZE;
+ break;
+ }
+
+ // set a minimum and maximum size allowed
+ max_size = DMA_BUF_SIZE;
+ // if we are taking limited number of conversions, limit transfer size to that
+ if (cmd->stop_src == TRIG_COUNT &&
+ cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
+ max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
+
+ if (size > max_size)
+ size = max_size;
+ if (size < sample_size)
+ size = sample_size;
+
+ return size;
+}
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