diff options
Diffstat (limited to 'drivers/comedi/drivers/dt282x.c')
| -rw-r--r-- | drivers/comedi/drivers/dt282x.c | 1170 |
1 files changed, 1170 insertions, 0 deletions
diff --git a/drivers/comedi/drivers/dt282x.c b/drivers/comedi/drivers/dt282x.c new file mode 100644 index 0000000000..4ae80e6c72 --- /dev/null +++ b/drivers/comedi/drivers/dt282x.c @@ -0,0 +1,1170 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * dt282x.c + * Comedi driver for Data Translation DT2821 series + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org> + */ + +/* + * Driver: dt282x + * Description: Data Translation DT2821 series (including DT-EZ) + * Author: ds + * Devices: [Data Translation] DT2821 (dt2821), DT2821-F-16SE (dt2821-f), + * DT2821-F-8DI (dt2821-f), DT2821-G-16SE (dt2821-g), + * DT2821-G-8DI (dt2821-g), DT2823 (dt2823), DT2824-PGH (dt2824-pgh), + * DT2824-PGL (dt2824-pgl), DT2825 (dt2825), DT2827 (dt2827), + * DT2828 (dt2828), DT2928 (dt2829), DT21-EZ (dt21-ez), DT23-EZ (dt23-ez), + * DT24-EZ (dt24-ez), DT24-EZ-PGL (dt24-ez-pgl) + * Status: complete + * Updated: Wed, 22 Aug 2001 17:11:34 -0700 + * + * Configuration options: + * [0] - I/O port base address + * [1] - IRQ (optional, required for async command support) + * [2] - DMA 1 (optional, required for async command support) + * [3] - DMA 2 (optional, required for async command support) + * [4] - AI jumpered for 0=single ended, 1=differential + * [5] - AI jumpered for 0=straight binary, 1=2's complement + * [6] - AO 0 data format (deprecated, see below) + * [7] - AO 1 data format (deprecated, see below) + * [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5] + * [9] - AO channel 0 range (deprecated, see below) + * [10]- AO channel 1 range (deprecated, see below) + * + * Notes: + * - AO commands might be broken. + * - If you try to run a command on both the AI and AO subdevices + * simultaneously, bad things will happen. The driver needs to + * be fixed to check for this situation and return an error. + * - AO range is not programmable. The AO subdevice has a range_table + * containing all the possible analog output ranges. Use the range + * that matches your board configuration to convert between data + * values and physical units. The format of the data written to the + * board is handled automatically based on the unipolar/bipolar + * range that is selected. + */ + +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/gfp.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/comedi/comedidev.h> +#include <linux/comedi/comedi_isadma.h> + +/* + * Register map + */ +#define DT2821_ADCSR_REG 0x00 +#define DT2821_ADCSR_ADERR BIT(15) +#define DT2821_ADCSR_ADCLK BIT(9) +#define DT2821_ADCSR_MUXBUSY BIT(8) +#define DT2821_ADCSR_ADDONE BIT(7) +#define DT2821_ADCSR_IADDONE BIT(6) +#define DT2821_ADCSR_GS(x) (((x) & 0x3) << 4) +#define DT2821_ADCSR_CHAN(x) (((x) & 0xf) << 0) +#define DT2821_CHANCSR_REG 0x02 +#define DT2821_CHANCSR_LLE BIT(15) +#define DT2821_CHANCSR_TO_PRESLA(x) (((x) >> 8) & 0xf) +#define DT2821_CHANCSR_NUMB(x) ((((x) - 1) & 0xf) << 0) +#define DT2821_ADDAT_REG 0x04 +#define DT2821_DACSR_REG 0x06 +#define DT2821_DACSR_DAERR BIT(15) +#define DT2821_DACSR_YSEL(x) ((x) << 9) +#define DT2821_DACSR_SSEL BIT(8) +#define DT2821_DACSR_DACRDY BIT(7) +#define DT2821_DACSR_IDARDY BIT(6) +#define DT2821_DACSR_DACLK BIT(5) +#define DT2821_DACSR_HBOE BIT(1) +#define DT2821_DACSR_LBOE BIT(0) +#define DT2821_DADAT_REG 0x08 +#define DT2821_DIODAT_REG 0x0a +#define DT2821_SUPCSR_REG 0x0c +#define DT2821_SUPCSR_DMAD BIT(15) +#define DT2821_SUPCSR_ERRINTEN BIT(14) +#define DT2821_SUPCSR_CLRDMADNE BIT(13) +#define DT2821_SUPCSR_DDMA BIT(12) +#define DT2821_SUPCSR_DS(x) (((x) & 0x3) << 10) +#define DT2821_SUPCSR_DS_PIO DT2821_SUPCSR_DS(0) +#define DT2821_SUPCSR_DS_AD_CLK DT2821_SUPCSR_DS(1) +#define DT2821_SUPCSR_DS_DA_CLK DT2821_SUPCSR_DS(2) +#define DT2821_SUPCSR_DS_AD_TRIG DT2821_SUPCSR_DS(3) +#define DT2821_SUPCSR_BUFFB BIT(9) +#define DT2821_SUPCSR_SCDN BIT(8) +#define DT2821_SUPCSR_DACON BIT(7) +#define DT2821_SUPCSR_ADCINIT BIT(6) +#define DT2821_SUPCSR_DACINIT BIT(5) +#define DT2821_SUPCSR_PRLD BIT(4) +#define DT2821_SUPCSR_STRIG BIT(3) +#define DT2821_SUPCSR_XTRIG BIT(2) +#define DT2821_SUPCSR_XCLK BIT(1) +#define DT2821_SUPCSR_BDINIT BIT(0) +#define DT2821_TMRCTR_REG 0x0e +#define DT2821_TMRCTR_PRESCALE(x) (((x) & 0xf) << 8) +#define DT2821_TMRCTR_DIVIDER(x) ((255 - ((x) & 0xff)) << 0) + +/* Pacer Clock */ +#define DT2821_OSC_BASE 250 /* 4 MHz (in nanoseconds) */ +#define DT2821_PRESCALE(x) BIT(x) +#define DT2821_PRESCALE_MAX 15 +#define DT2821_DIVIDER_MAX 255 +#define DT2821_OSC_MAX (DT2821_OSC_BASE * \ + DT2821_PRESCALE(DT2821_PRESCALE_MAX) * \ + DT2821_DIVIDER_MAX) + +static const struct comedi_lrange range_dt282x_ai_lo_bipolar = { + 4, { + BIP_RANGE(10), + BIP_RANGE(5), + BIP_RANGE(2.5), + BIP_RANGE(1.25) + } +}; + +static const struct comedi_lrange range_dt282x_ai_lo_unipolar = { + 4, { + UNI_RANGE(10), + UNI_RANGE(5), + UNI_RANGE(2.5), + UNI_RANGE(1.25) + } +}; + +static const struct comedi_lrange range_dt282x_ai_5_bipolar = { + 4, { + BIP_RANGE(5), + BIP_RANGE(2.5), + BIP_RANGE(1.25), + BIP_RANGE(0.625) + } +}; + +static const struct comedi_lrange range_dt282x_ai_5_unipolar = { + 4, { + UNI_RANGE(5), + UNI_RANGE(2.5), + UNI_RANGE(1.25), + UNI_RANGE(0.625) + } +}; + +static const struct comedi_lrange range_dt282x_ai_hi_bipolar = { + 4, { + BIP_RANGE(10), + BIP_RANGE(1), + BIP_RANGE(0.1), + BIP_RANGE(0.02) + } +}; + +static const struct comedi_lrange range_dt282x_ai_hi_unipolar = { + 4, { + UNI_RANGE(10), + UNI_RANGE(1), + UNI_RANGE(0.1), + UNI_RANGE(0.02) + } +}; + +/* + * The Analog Output range is set per-channel using jumpers on the board. + * All of these ranges may not be available on some DT2821 series boards. + * The default jumper setting has both channels set for +/-10V output. + */ +static const struct comedi_lrange dt282x_ao_range = { + 5, { + BIP_RANGE(10), + BIP_RANGE(5), + BIP_RANGE(2.5), + UNI_RANGE(10), + UNI_RANGE(5), + } +}; + +struct dt282x_board { + const char *name; + unsigned int ai_maxdata; + int adchan_se; + int adchan_di; + int ai_speed; + int ispgl; + int dachan; + unsigned int ao_maxdata; +}; + +static const struct dt282x_board boardtypes[] = { + { + .name = "dt2821", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 20000, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt2821-f", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 6500, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt2821-g", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 4000, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt2823", + .ai_maxdata = 0xffff, + .adchan_di = 4, + .ai_speed = 10000, + .dachan = 2, + .ao_maxdata = 0xffff, + }, { + .name = "dt2824-pgh", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 20000, + }, { + .name = "dt2824-pgl", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 20000, + .ispgl = 1, + }, { + .name = "dt2825", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 20000, + .ispgl = 1, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt2827", + .ai_maxdata = 0xffff, + .adchan_di = 4, + .ai_speed = 10000, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt2828", + .ai_maxdata = 0x0fff, + .adchan_se = 4, + .ai_speed = 10000, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt2829", + .ai_maxdata = 0xffff, + .adchan_se = 8, + .ai_speed = 33250, + .dachan = 2, + .ao_maxdata = 0xffff, + }, { + .name = "dt21-ez", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 10000, + .dachan = 2, + .ao_maxdata = 0x0fff, + }, { + .name = "dt23-ez", + .ai_maxdata = 0xffff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 10000, + }, { + .name = "dt24-ez", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 10000, + }, { + .name = "dt24-ez-pgl", + .ai_maxdata = 0x0fff, + .adchan_se = 16, + .adchan_di = 8, + .ai_speed = 10000, + .ispgl = 1, + }, +}; + +struct dt282x_private { + struct comedi_isadma *dma; + unsigned int ad_2scomp:1; + unsigned int divisor; + int dacsr; /* software copies of registers */ + int adcsr; + int supcsr; + int ntrig; + int nread; + int dma_dir; +}; + +static int dt282x_prep_ai_dma(struct comedi_device *dev, int dma_index, int n) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc = &dma->desc[dma_index]; + + if (!devpriv->ntrig) + return 0; + + if (n == 0) + n = desc->maxsize; + if (n > devpriv->ntrig * 2) + n = devpriv->ntrig * 2; + devpriv->ntrig -= n / 2; + + desc->size = n; + comedi_isadma_set_mode(desc, devpriv->dma_dir); + + comedi_isadma_program(desc); + + return n; +} + +static int dt282x_prep_ao_dma(struct comedi_device *dev, int dma_index, int n) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc = &dma->desc[dma_index]; + + desc->size = n; + comedi_isadma_set_mode(desc, devpriv->dma_dir); + + comedi_isadma_program(desc); + + return n; +} + +static void dt282x_disable_dma(struct comedi_device *dev) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc; + int i; + + for (i = 0; i < 2; i++) { + desc = &dma->desc[i]; + comedi_isadma_disable(desc->chan); + } +} + +static unsigned int dt282x_ns_to_timer(unsigned int *ns, unsigned int flags) +{ + unsigned int prescale, base, divider; + + for (prescale = 0; prescale <= DT2821_PRESCALE_MAX; prescale++) { + if (prescale == 1) /* 0 and 1 are both divide by 1 */ + continue; + base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale); + switch (flags & CMDF_ROUND_MASK) { + case CMDF_ROUND_NEAREST: + default: + divider = DIV_ROUND_CLOSEST(*ns, base); + break; + case CMDF_ROUND_DOWN: + divider = (*ns) / base; + break; + case CMDF_ROUND_UP: + divider = DIV_ROUND_UP(*ns, base); + break; + } + if (divider <= DT2821_DIVIDER_MAX) + break; + } + if (divider > DT2821_DIVIDER_MAX) { + prescale = DT2821_PRESCALE_MAX; + divider = DT2821_DIVIDER_MAX; + base = DT2821_OSC_BASE * DT2821_PRESCALE(prescale); + } + *ns = divider * base; + return DT2821_TMRCTR_PRESCALE(prescale) | + DT2821_TMRCTR_DIVIDER(divider); +} + +static void dt282x_munge(struct comedi_device *dev, + struct comedi_subdevice *s, + unsigned short *buf, + unsigned int nbytes) +{ + struct dt282x_private *devpriv = dev->private; + unsigned int val; + int i; + + if (nbytes % 2) + dev_err(dev->class_dev, + "bug! odd number of bytes from dma xfer\n"); + + for (i = 0; i < nbytes / 2; i++) { + val = buf[i]; + val &= s->maxdata; + if (devpriv->ad_2scomp) + val = comedi_offset_munge(s, val); + + buf[i] = val; + } +} + +static unsigned int dt282x_ao_setup_dma(struct comedi_device *dev, + struct comedi_subdevice *s, + int cur_dma) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc = &dma->desc[cur_dma]; + unsigned int nsamples = comedi_bytes_to_samples(s, desc->maxsize); + unsigned int nbytes; + + nbytes = comedi_buf_read_samples(s, desc->virt_addr, nsamples); + if (nbytes) + dt282x_prep_ao_dma(dev, cur_dma, nbytes); + else + dev_err(dev->class_dev, "AO underrun\n"); + + return nbytes; +} + +static void dt282x_ao_dma_interrupt(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; + + outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE, + dev->iobase + DT2821_SUPCSR_REG); + + comedi_isadma_disable(desc->chan); + + if (!dt282x_ao_setup_dma(dev, s, dma->cur_dma)) + s->async->events |= COMEDI_CB_OVERFLOW; + + dma->cur_dma = 1 - dma->cur_dma; +} + +static void dt282x_ai_dma_interrupt(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; + unsigned int nsamples = comedi_bytes_to_samples(s, desc->size); + int ret; + + outw(devpriv->supcsr | DT2821_SUPCSR_CLRDMADNE, + dev->iobase + DT2821_SUPCSR_REG); + + comedi_isadma_disable(desc->chan); + + dt282x_munge(dev, s, desc->virt_addr, desc->size); + ret = comedi_buf_write_samples(s, desc->virt_addr, nsamples); + if (ret != desc->size) + return; + + devpriv->nread -= nsamples; + if (devpriv->nread < 0) { + dev_info(dev->class_dev, "nread off by one\n"); + devpriv->nread = 0; + } + if (!devpriv->nread) { + s->async->events |= COMEDI_CB_EOA; + return; + } + + /* restart the channel */ + dt282x_prep_ai_dma(dev, dma->cur_dma, 0); + + dma->cur_dma = 1 - dma->cur_dma; +} + +static irqreturn_t dt282x_interrupt(int irq, void *d) +{ + struct comedi_device *dev = d; + struct dt282x_private *devpriv = dev->private; + struct comedi_subdevice *s = dev->read_subdev; + struct comedi_subdevice *s_ao = dev->write_subdev; + unsigned int supcsr, adcsr, dacsr; + int handled = 0; + + if (!dev->attached) { + dev_err(dev->class_dev, "spurious interrupt\n"); + return IRQ_HANDLED; + } + + adcsr = inw(dev->iobase + DT2821_ADCSR_REG); + dacsr = inw(dev->iobase + DT2821_DACSR_REG); + supcsr = inw(dev->iobase + DT2821_SUPCSR_REG); + if (supcsr & DT2821_SUPCSR_DMAD) { + if (devpriv->dma_dir == COMEDI_ISADMA_READ) + dt282x_ai_dma_interrupt(dev, s); + else + dt282x_ao_dma_interrupt(dev, s_ao); + handled = 1; + } + if (adcsr & DT2821_ADCSR_ADERR) { + if (devpriv->nread != 0) { + dev_err(dev->class_dev, "A/D error\n"); + s->async->events |= COMEDI_CB_ERROR; + } + handled = 1; + } + if (dacsr & DT2821_DACSR_DAERR) { + dev_err(dev->class_dev, "D/A error\n"); + s_ao->async->events |= COMEDI_CB_ERROR; + handled = 1; + } + + comedi_handle_events(dev, s); + if (s_ao) + comedi_handle_events(dev, s_ao); + + return IRQ_RETVAL(handled); +} + +static void dt282x_load_changain(struct comedi_device *dev, int n, + unsigned int *chanlist) +{ + struct dt282x_private *devpriv = dev->private; + int i; + + outw(DT2821_CHANCSR_LLE | DT2821_CHANCSR_NUMB(n), + dev->iobase + DT2821_CHANCSR_REG); + for (i = 0; i < n; i++) { + unsigned int chan = CR_CHAN(chanlist[i]); + unsigned int range = CR_RANGE(chanlist[i]); + + outw(devpriv->adcsr | + DT2821_ADCSR_GS(range) | + DT2821_ADCSR_CHAN(chan), + dev->iobase + DT2821_ADCSR_REG); + } + outw(DT2821_CHANCSR_NUMB(n), dev->iobase + DT2821_CHANCSR_REG); +} + +static int dt282x_ai_timeout(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned long context) +{ + unsigned int status; + + status = inw(dev->iobase + DT2821_ADCSR_REG); + switch (context) { + case DT2821_ADCSR_MUXBUSY: + if ((status & DT2821_ADCSR_MUXBUSY) == 0) + return 0; + break; + case DT2821_ADCSR_ADDONE: + if (status & DT2821_ADCSR_ADDONE) + return 0; + break; + default: + return -EINVAL; + } + return -EBUSY; +} + +/* + * Performs a single A/D conversion. + * - Put channel/gain into channel-gain list + * - preload multiplexer + * - trigger conversion and wait for it to finish + */ +static int dt282x_ai_insn_read(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct dt282x_private *devpriv = dev->private; + unsigned int val; + int ret; + int i; + + /* XXX should we really be enabling the ad clock here? */ + devpriv->adcsr = DT2821_ADCSR_ADCLK; + outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG); + + dt282x_load_changain(dev, 1, &insn->chanspec); + + outw(devpriv->supcsr | DT2821_SUPCSR_PRLD, + dev->iobase + DT2821_SUPCSR_REG); + ret = comedi_timeout(dev, s, insn, + dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY); + if (ret) + return ret; + + for (i = 0; i < insn->n; i++) { + outw(devpriv->supcsr | DT2821_SUPCSR_STRIG, + dev->iobase + DT2821_SUPCSR_REG); + + ret = comedi_timeout(dev, s, insn, + dt282x_ai_timeout, DT2821_ADCSR_ADDONE); + if (ret) + return ret; + + val = inw(dev->iobase + DT2821_ADDAT_REG); + val &= s->maxdata; + if (devpriv->ad_2scomp) + val = comedi_offset_munge(s, val); + + data[i] = val; + } + + return i; +} + +static int dt282x_ai_cmdtest(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + const struct dt282x_board *board = dev->board_ptr; + struct dt282x_private *devpriv = dev->private; + int err = 0; + unsigned int arg; + + /* Step 1 : check if triggers are trivially valid */ + + err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW); + err |= comedi_check_trigger_src(&cmd->scan_begin_src, + TRIG_FOLLOW | TRIG_EXT); + err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_TIMER); + err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); + err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); + + if (err) + return 1; + + /* Step 2a : make sure trigger sources are unique */ + + err |= comedi_check_trigger_is_unique(cmd->scan_begin_src); + err |= comedi_check_trigger_is_unique(cmd->stop_src); + + /* Step 2b : and mutually compatible */ + + if (err) + return 2; + + /* Step 3: check if arguments are trivially valid */ + + err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); + err |= comedi_check_trigger_arg_max(&cmd->convert_arg, DT2821_OSC_MAX); + err |= comedi_check_trigger_arg_min(&cmd->convert_arg, board->ai_speed); + err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, + cmd->chanlist_len); + + if (cmd->stop_src == TRIG_COUNT) + err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); + else /* TRIG_EXT | TRIG_NONE */ + err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); + + if (err) + return 3; + + /* step 4: fix up any arguments */ + + arg = cmd->convert_arg; + devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags); + err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg); + + if (err) + return 4; + + return 0; +} + +static int dt282x_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_cmd *cmd = &s->async->cmd; + int ret; + + dt282x_disable_dma(dev); + + outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG); + + devpriv->supcsr = DT2821_SUPCSR_ERRINTEN; + if (cmd->scan_begin_src == TRIG_FOLLOW) + devpriv->supcsr = DT2821_SUPCSR_DS_AD_CLK; + else + devpriv->supcsr = DT2821_SUPCSR_DS_AD_TRIG; + outw(devpriv->supcsr | + DT2821_SUPCSR_CLRDMADNE | + DT2821_SUPCSR_BUFFB | + DT2821_SUPCSR_ADCINIT, + dev->iobase + DT2821_SUPCSR_REG); + + devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg; + devpriv->nread = devpriv->ntrig; + + devpriv->dma_dir = COMEDI_ISADMA_READ; + dma->cur_dma = 0; + dt282x_prep_ai_dma(dev, 0, 0); + if (devpriv->ntrig) { + dt282x_prep_ai_dma(dev, 1, 0); + devpriv->supcsr |= DT2821_SUPCSR_DDMA; + outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG); + } + + devpriv->adcsr = 0; + + dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist); + + devpriv->adcsr = DT2821_ADCSR_ADCLK | DT2821_ADCSR_IADDONE; + outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG); + + outw(devpriv->supcsr | DT2821_SUPCSR_PRLD, + dev->iobase + DT2821_SUPCSR_REG); + ret = comedi_timeout(dev, s, NULL, + dt282x_ai_timeout, DT2821_ADCSR_MUXBUSY); + if (ret) + return ret; + + if (cmd->scan_begin_src == TRIG_FOLLOW) { + outw(devpriv->supcsr | DT2821_SUPCSR_STRIG, + dev->iobase + DT2821_SUPCSR_REG); + } else { + devpriv->supcsr |= DT2821_SUPCSR_XTRIG; + outw(devpriv->supcsr, dev->iobase + DT2821_SUPCSR_REG); + } + + return 0; +} + +static int dt282x_ai_cancel(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + struct dt282x_private *devpriv = dev->private; + + dt282x_disable_dma(dev); + + devpriv->adcsr = 0; + outw(devpriv->adcsr, dev->iobase + DT2821_ADCSR_REG); + + devpriv->supcsr = 0; + outw(devpriv->supcsr | DT2821_SUPCSR_ADCINIT, + dev->iobase + DT2821_SUPCSR_REG); + + return 0; +} + +static int dt282x_ao_insn_write(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct dt282x_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int range = CR_RANGE(insn->chanspec); + int i; + + devpriv->dacsr |= DT2821_DACSR_SSEL | DT2821_DACSR_YSEL(chan); + + for (i = 0; i < insn->n; i++) { + unsigned int val = data[i]; + + s->readback[chan] = val; + + if (comedi_range_is_bipolar(s, range)) + val = comedi_offset_munge(s, val); + + outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG); + + outw(val, dev->iobase + DT2821_DADAT_REG); + + outw(devpriv->supcsr | DT2821_SUPCSR_DACON, + dev->iobase + DT2821_SUPCSR_REG); + } + + return insn->n; +} + +static int dt282x_ao_cmdtest(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_cmd *cmd) +{ + struct dt282x_private *devpriv = dev->private; + int err = 0; + unsigned int arg; + + /* Step 1 : check if triggers are trivially valid */ + + err |= comedi_check_trigger_src(&cmd->start_src, TRIG_INT); + err |= comedi_check_trigger_src(&cmd->scan_begin_src, TRIG_TIMER); + err |= comedi_check_trigger_src(&cmd->convert_src, TRIG_NOW); + err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); + err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); + + if (err) + return 1; + + /* Step 2a : make sure trigger sources are unique */ + + err |= comedi_check_trigger_is_unique(cmd->stop_src); + + /* Step 2b : and mutually compatible */ + + if (err) + return 2; + + /* Step 3: check if arguments are trivially valid */ + + err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); + err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 5000); + err |= comedi_check_trigger_arg_is(&cmd->convert_arg, 0); + err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, + cmd->chanlist_len); + + if (cmd->stop_src == TRIG_COUNT) + err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); + else /* TRIG_EXT | TRIG_NONE */ + err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); + + if (err) + return 3; + + /* step 4: fix up any arguments */ + + arg = cmd->scan_begin_arg; + devpriv->divisor = dt282x_ns_to_timer(&arg, cmd->flags); + err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); + + if (err) + return 4; + + return 0; +} + +static int dt282x_ao_inttrig(struct comedi_device *dev, + struct comedi_subdevice *s, + unsigned int trig_num) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_cmd *cmd = &s->async->cmd; + + if (trig_num != cmd->start_src) + return -EINVAL; + + if (!dt282x_ao_setup_dma(dev, s, 0)) + return -EPIPE; + + if (!dt282x_ao_setup_dma(dev, s, 1)) + return -EPIPE; + + outw(devpriv->supcsr | DT2821_SUPCSR_STRIG, + dev->iobase + DT2821_SUPCSR_REG); + s->async->inttrig = NULL; + + return 1; +} + +static int dt282x_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s) +{ + struct dt282x_private *devpriv = dev->private; + struct comedi_isadma *dma = devpriv->dma; + struct comedi_cmd *cmd = &s->async->cmd; + + dt282x_disable_dma(dev); + + devpriv->supcsr = DT2821_SUPCSR_ERRINTEN | + DT2821_SUPCSR_DS_DA_CLK | + DT2821_SUPCSR_DDMA; + outw(devpriv->supcsr | + DT2821_SUPCSR_CLRDMADNE | + DT2821_SUPCSR_BUFFB | + DT2821_SUPCSR_DACINIT, + dev->iobase + DT2821_SUPCSR_REG); + + devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len; + devpriv->nread = devpriv->ntrig; + + devpriv->dma_dir = COMEDI_ISADMA_WRITE; + dma->cur_dma = 0; + + outw(devpriv->divisor, dev->iobase + DT2821_TMRCTR_REG); + + /* clear all bits but the DIO direction bits */ + devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE); + + devpriv->dacsr |= (DT2821_DACSR_SSEL | + DT2821_DACSR_DACLK | + DT2821_DACSR_IDARDY); + outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG); + + s->async->inttrig = dt282x_ao_inttrig; + + return 0; +} + +static int dt282x_ao_cancel(struct comedi_device *dev, + struct comedi_subdevice *s) +{ + struct dt282x_private *devpriv = dev->private; + + dt282x_disable_dma(dev); + + /* clear all bits but the DIO direction bits */ + devpriv->dacsr &= (DT2821_DACSR_LBOE | DT2821_DACSR_HBOE); + + outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG); + + devpriv->supcsr = 0; + outw(devpriv->supcsr | DT2821_SUPCSR_DACINIT, + dev->iobase + DT2821_SUPCSR_REG); + + return 0; +} + +static int dt282x_dio_insn_bits(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + if (comedi_dio_update_state(s, data)) + outw(s->state, dev->iobase + DT2821_DIODAT_REG); + + data[1] = inw(dev->iobase + DT2821_DIODAT_REG); + + return insn->n; +} + +static int dt282x_dio_insn_config(struct comedi_device *dev, + struct comedi_subdevice *s, + struct comedi_insn *insn, + unsigned int *data) +{ + struct dt282x_private *devpriv = dev->private; + unsigned int chan = CR_CHAN(insn->chanspec); + unsigned int mask; + int ret; + + if (chan < 8) + mask = 0x00ff; + else + mask = 0xff00; + + ret = comedi_dio_insn_config(dev, s, insn, data, mask); + if (ret) + return ret; + + devpriv->dacsr &= ~(DT2821_DACSR_LBOE | DT2821_DACSR_HBOE); + if (s->io_bits & 0x00ff) + devpriv->dacsr |= DT2821_DACSR_LBOE; + if (s->io_bits & 0xff00) + devpriv->dacsr |= DT2821_DACSR_HBOE; + + outw(devpriv->dacsr, dev->iobase + DT2821_DACSR_REG); + + return insn->n; +} + +static const struct comedi_lrange *const ai_range_table[] = { + &range_dt282x_ai_lo_bipolar, + &range_dt282x_ai_lo_unipolar, + &range_dt282x_ai_5_bipolar, + &range_dt282x_ai_5_unipolar +}; + +static const struct comedi_lrange *const ai_range_pgl_table[] = { + &range_dt282x_ai_hi_bipolar, + &range_dt282x_ai_hi_unipolar +}; + +static const struct comedi_lrange *opt_ai_range_lkup(int ispgl, int x) +{ + if (ispgl) { + if (x < 0 || x >= 2) + x = 0; + return ai_range_pgl_table[x]; + } + + if (x < 0 || x >= 4) + x = 0; + return ai_range_table[x]; +} + +static void dt282x_alloc_dma(struct comedi_device *dev, + struct comedi_devconfig *it) +{ + struct dt282x_private *devpriv = dev->private; + unsigned int irq_num = it->options[1]; + unsigned int dma_chan[2]; + + if (it->options[2] < it->options[3]) { + dma_chan[0] = it->options[2]; + dma_chan[1] = it->options[3]; + } else { + dma_chan[0] = it->options[3]; + dma_chan[1] = it->options[2]; + } + + if (!irq_num || dma_chan[0] == dma_chan[1] || + dma_chan[0] < 5 || dma_chan[0] > 7 || + dma_chan[1] < 5 || dma_chan[1] > 7) + return; + + if (request_irq(irq_num, dt282x_interrupt, 0, dev->board_name, dev)) + return; + + /* DMA uses two 4K buffers with separate DMA channels */ + devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan[0], dma_chan[1], + PAGE_SIZE, 0); + if (!devpriv->dma) + free_irq(irq_num, dev); + else + dev->irq = irq_num; +} + +static void dt282x_free_dma(struct comedi_device *dev) +{ + struct dt282x_private *devpriv = dev->private; + + if (devpriv) + comedi_isadma_free(devpriv->dma); +} + +static int dt282x_initialize(struct comedi_device *dev) +{ + /* Initialize board */ + outw(DT2821_SUPCSR_BDINIT, dev->iobase + DT2821_SUPCSR_REG); + inw(dev->iobase + DT2821_ADCSR_REG); + + /* + * At power up, some registers are in a well-known state. + * Check them to see if a DT2821 series board is present. + */ + if (((inw(dev->iobase + DT2821_ADCSR_REG) & 0xfff0) != 0x7c00) || + ((inw(dev->iobase + DT2821_CHANCSR_REG) & 0xf0f0) != 0x70f0) || + ((inw(dev->iobase + DT2821_DACSR_REG) & 0x7c93) != 0x7c90) || + ((inw(dev->iobase + DT2821_SUPCSR_REG) & 0xf8ff) != 0x0000) || + ((inw(dev->iobase + DT2821_TMRCTR_REG) & 0xff00) != 0xf000)) { + dev_err(dev->class_dev, "board not found\n"); + return -EIO; + } + return 0; +} + +static int dt282x_attach(struct comedi_device *dev, struct comedi_devconfig *it) +{ + const struct dt282x_board *board = dev->board_ptr; + struct dt282x_private *devpriv; + struct comedi_subdevice *s; + int ret; + + ret = comedi_request_region(dev, it->options[0], 0x10); + if (ret) + return ret; + + ret = dt282x_initialize(dev); + if (ret) + return ret; + + devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); + if (!devpriv) + return -ENOMEM; + + /* an IRQ and 2 DMA channels are required for async command support */ + dt282x_alloc_dma(dev, it); + + ret = comedi_alloc_subdevices(dev, 3); + if (ret) + return ret; + + /* Analog Input subdevice */ + s = &dev->subdevices[0]; + s->type = COMEDI_SUBD_AI; + s->subdev_flags = SDF_READABLE; + if ((it->options[4] && board->adchan_di) || board->adchan_se == 0) { + s->subdev_flags |= SDF_DIFF; + s->n_chan = board->adchan_di; + } else { + s->subdev_flags |= SDF_COMMON; + s->n_chan = board->adchan_se; + } + s->maxdata = board->ai_maxdata; + + s->range_table = opt_ai_range_lkup(board->ispgl, it->options[8]); + devpriv->ad_2scomp = it->options[5] ? 1 : 0; + + s->insn_read = dt282x_ai_insn_read; + if (dev->irq) { + dev->read_subdev = s; + s->subdev_flags |= SDF_CMD_READ; + s->len_chanlist = s->n_chan; + s->do_cmdtest = dt282x_ai_cmdtest; + s->do_cmd = dt282x_ai_cmd; + s->cancel = dt282x_ai_cancel; + } + + /* Analog Output subdevice */ + s = &dev->subdevices[1]; + if (board->dachan) { + s->type = COMEDI_SUBD_AO; + s->subdev_flags = SDF_WRITABLE; + s->n_chan = board->dachan; + s->maxdata = board->ao_maxdata; + /* ranges are per-channel, set by jumpers on the board */ + s->range_table = &dt282x_ao_range; + s->insn_write = dt282x_ao_insn_write; + if (dev->irq) { + dev->write_subdev = s; + s->subdev_flags |= SDF_CMD_WRITE; + s->len_chanlist = s->n_chan; + s->do_cmdtest = dt282x_ao_cmdtest; + s->do_cmd = dt282x_ao_cmd; + s->cancel = dt282x_ao_cancel; + } + + ret = comedi_alloc_subdev_readback(s); + if (ret) + return ret; + } else { + s->type = COMEDI_SUBD_UNUSED; + } + + /* Digital I/O subdevice */ + s = &dev->subdevices[2]; + s->type = COMEDI_SUBD_DIO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->n_chan = 16; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = dt282x_dio_insn_bits; + s->insn_config = dt282x_dio_insn_config; + + return 0; +} + +static void dt282x_detach(struct comedi_device *dev) +{ + dt282x_free_dma(dev); + comedi_legacy_detach(dev); +} + +static struct comedi_driver dt282x_driver = { + .driver_name = "dt282x", + .module = THIS_MODULE, + .attach = dt282x_attach, + .detach = dt282x_detach, + .board_name = &boardtypes[0].name, + .num_names = ARRAY_SIZE(boardtypes), + .offset = sizeof(struct dt282x_board), +}; +module_comedi_driver(dt282x_driver); + +MODULE_AUTHOR("Comedi https://www.comedi.org"); +MODULE_DESCRIPTION("Comedi driver for Data Translation DT2821 series"); +MODULE_LICENSE("GPL"); |