--- /dev/null
+/*
+ comedi/drivers/dt282x.c
+ Hardware driver for Data Translation DT2821 series
+
+ COMEDI - Linux Control and Measurement Device Interface
+ Copyright (C) 1997-8 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: 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-f), DT2821-G-8DI (dt2821-g),
+ DT2823 (dt2823),
+ DT2824-PGH (dt2824-pgh), DT2824-PGL (dt2824-pgl), DT2825 (dt2825),
+ DT2827 (dt2827), DT2828 (dt2828), 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
+ [2] - DMA 1
+ [3] - DMA 2
+ [4] - AI jumpered for 0=single ended, 1=differential
+ [5] - AI jumpered for 0=straight binary, 1=2's complement
+ [6] - AO 0 jumpered for 0=straight binary, 1=2's complement
+ [7] - AO 1 jumpered for 0=straight binary, 1=2's complement
+ [8] - AI jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5]
+ [9] - AO 0 jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5],
+ 4=[-2.5,2.5]
+ [10]- A0 1 jumpered for 0=[-10,10]V, 1=[0,10], 2=[-5,5], 3=[0,5],
+ 4=[-2.5,2.5]
+
+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.
+*/
+
+#include "../comedidev.h"
+
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <asm/dma.h>
+#include "comedi_fc.h"
+
+#define DEBUG
+
+#define DT2821_TIMEOUT 100 /* 500 us */
+#define DT2821_SIZE 0x10
+
+/*
+ * Registers in the DT282x
+ */
+
+#define DT2821_ADCSR 0x00 /* A/D Control/Status */
+#define DT2821_CHANCSR 0x02 /* Channel Control/Status */
+#define DT2821_ADDAT 0x04 /* A/D data */
+#define DT2821_DACSR 0x06 /* D/A Control/Status */
+#define DT2821_DADAT 0x08 /* D/A data */
+#define DT2821_DIODAT 0x0a /* digital data */
+#define DT2821_SUPCSR 0x0c /* Supervisor Control/Status */
+#define DT2821_TMRCTR 0x0e /* Timer/Counter */
+
+/*
+ * At power up, some registers are in a well-known state. The
+ * masks and values are as follows:
+ */
+
+#define DT2821_ADCSR_MASK 0xfff0
+#define DT2821_ADCSR_VAL 0x7c00
+
+#define DT2821_CHANCSR_MASK 0xf0f0
+#define DT2821_CHANCSR_VAL 0x70f0
+
+#define DT2821_DACSR_MASK 0x7c93
+#define DT2821_DACSR_VAL 0x7c90
+
+#define DT2821_SUPCSR_MASK 0xf8ff
+#define DT2821_SUPCSR_VAL 0x0000
+
+#define DT2821_TMRCTR_MASK 0xff00
+#define DT2821_TMRCTR_VAL 0xf000
+
+/*
+ * Bit fields of each register
+ */
+
+/* ADCSR */
+
+#define DT2821_ADERR 0x8000 /* (R) 1 for A/D error */
+#define DT2821_ADCLK 0x0200 /* (R/W) A/D clock enable */
+ /* 0x7c00 read as 1's */
+#define DT2821_MUXBUSY 0x0100 /* (R) multiplexer busy */
+#define DT2821_ADDONE 0x0080 /* (R) A/D done */
+#define DT2821_IADDONE 0x0040 /* (R/W) interrupt on A/D done */
+ /* 0x0030 gain select */
+ /* 0x000f channel select */
+
+/* CHANCSR */
+
+#define DT2821_LLE 0x8000 /* (R/W) Load List Enable */
+ /* 0x7000 read as 1's */
+ /* 0x0f00 (R) present address */
+ /* 0x00f0 read as 1's */
+ /* 0x000f (R) number of entries - 1 */
+
+/* DACSR */
+
+#define DT2821_DAERR 0x8000 /* (R) D/A error */
+#define DT2821_YSEL 0x0200 /* (R/W) DAC 1 select */
+#define DT2821_SSEL 0x0100 /* (R/W) single channel select */
+#define DT2821_DACRDY 0x0080 /* (R) DAC ready */
+#define DT2821_IDARDY 0x0040 /* (R/W) interrupt on DAC ready */
+#define DT2821_DACLK 0x0020 /* (R/W) D/A clock enable */
+#define DT2821_HBOE 0x0002 /* (R/W) DIO high byte output enable */
+#define DT2821_LBOE 0x0001 /* (R/W) DIO low byte output enable */
+
+/* SUPCSR */
+
+#define DT2821_DMAD 0x8000 /* (R) DMA done */
+#define DT2821_ERRINTEN 0x4000 /* (R/W) interrupt on error */
+#define DT2821_CLRDMADNE 0x2000 /* (W) clear DMA done */
+#define DT2821_DDMA 0x1000 /* (R/W) dual DMA */
+#define DT2821_DS1 0x0800 /* (R/W) DMA select 1 */
+#define DT2821_DS0 0x0400 /* (R/W) DMA select 0 */
+#define DT2821_BUFFB 0x0200 /* (R/W) buffer B selected */
+#define DT2821_SCDN 0x0100 /* (R) scan done */
+#define DT2821_DACON 0x0080 /* (W) DAC single conversion */
+#define DT2821_ADCINIT 0x0040 /* (W) A/D initialize */
+#define DT2821_DACINIT 0x0020 /* (W) D/A initialize */
+#define DT2821_PRLD 0x0010 /* (W) preload multiplexer */
+#define DT2821_STRIG 0x0008 /* (W) software trigger */
+#define DT2821_XTRIG 0x0004 /* (R/W) external trigger enable */
+#define DT2821_XCLK 0x0002 /* (R/W) external clock enable */
+#define DT2821_BDINIT 0x0001 /* (W) initialize board */
+
+static const comedi_lrange range_dt282x_ai_lo_bipolar = { 4, {
+ RANGE(-10, 10),
+ RANGE(-5, 5),
+ RANGE(-2.5, 2.5),
+ RANGE(-1.25, 1.25)
+ }
+};
+static const comedi_lrange range_dt282x_ai_lo_unipolar = { 4, {
+ RANGE(0, 10),
+ RANGE(0, 5),
+ RANGE(0, 2.5),
+ RANGE(0, 1.25)
+ }
+};
+static const comedi_lrange range_dt282x_ai_5_bipolar = { 4, {
+ RANGE(-5, 5),
+ RANGE(-2.5, 2.5),
+ RANGE(-1.25, 1.25),
+ RANGE(-0.625, 0.625),
+ }
+};
+static const comedi_lrange range_dt282x_ai_5_unipolar = { 4, {
+ RANGE(0, 5),
+ RANGE(0, 2.5),
+ RANGE(0, 1.25),
+ RANGE(0, 0.625),
+ }
+};
+static const comedi_lrange range_dt282x_ai_hi_bipolar = { 4, {
+ RANGE(-10, 10),
+ RANGE(-1, 1),
+ RANGE(-0.1, 0.1),
+ RANGE(-0.02, 0.02)
+ }
+};
+static const comedi_lrange range_dt282x_ai_hi_unipolar = { 4, {
+ RANGE(0, 10),
+ RANGE(0, 1),
+ RANGE(0, 0.1),
+ RANGE(0, 0.02)
+ }
+};
+
+typedef struct {
+ const char *name;
+ int adbits;
+ int adchan_se;
+ int adchan_di;
+ int ai_speed;
+ int ispgl;
+ int dachan;
+ int dabits;
+} boardtype_t;
+
+static const boardtype_t boardtypes[] = {
+ {name:"dt2821",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:20000,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt2821-f",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:6500,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt2821-g",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:4000,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt2823",
+ adbits: 16,
+ adchan_se:0,
+ adchan_di:4,
+ ai_speed:10000,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 16,
+ },
+ {name:"dt2824-pgh",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:20000,
+ ispgl: 0,
+ dachan: 0,
+ dabits: 0,
+ },
+ {name:"dt2824-pgl",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:20000,
+ ispgl: 1,
+ dachan: 0,
+ dabits: 0,
+ },
+ {name:"dt2825",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:20000,
+ ispgl: 1,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt2827",
+ adbits: 16,
+ adchan_se:0,
+ adchan_di:4,
+ ai_speed:10000,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt2828",
+ adbits: 12,
+ adchan_se:4,
+ adchan_di:0,
+ ai_speed:10000,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt2829",
+ adbits: 16,
+ adchan_se:8,
+ adchan_di:0,
+ ai_speed:33250,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 16,
+ },
+ {name:"dt21-ez",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:10000,
+ ispgl: 0,
+ dachan: 2,
+ dabits: 12,
+ },
+ {name:"dt23-ez",
+ adbits: 16,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:10000,
+ ispgl: 0,
+ dachan: 0,
+ dabits: 0,
+ },
+ {name:"dt24-ez",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:10000,
+ ispgl: 0,
+ dachan: 0,
+ dabits: 0,
+ },
+ {name:"dt24-ez-pgl",
+ adbits: 12,
+ adchan_se:16,
+ adchan_di:8,
+ ai_speed:10000,
+ ispgl: 1,
+ dachan: 0,
+ dabits: 0,
+ },
+};
+
+#define n_boardtypes sizeof(boardtypes)/sizeof(boardtype_t)
+#define this_board ((const boardtype_t *)dev->board_ptr)
+
+typedef struct {
+ int ad_2scomp; /* we have 2's comp jumper set */
+ int da0_2scomp; /* same, for DAC0 */
+ int da1_2scomp; /* same, for DAC1 */
+
+ const comedi_lrange *darangelist[2];
+
+ sampl_t ao[2];
+
+ volatile int dacsr; /* software copies of registers */
+ volatile int adcsr;
+ volatile int supcsr;
+
+ volatile int ntrig;
+ volatile int nread;
+
+ struct {
+ int chan;
+ short *buf; /* DMA buffer */
+ volatile int size; /* size of current transfer */
+ } dma[2];
+ int dma_maxsize; /* max size of DMA transfer (in bytes) */
+ int usedma; /* driver uses DMA */
+ volatile int current_dma_index;
+ int dma_dir;
+} dt282x_private;
+
+#define devpriv ((dt282x_private *)dev->private)
+#define boardtype (*(const boardtype_t *)dev->board_ptr)
+
+/*
+ * Some useless abstractions
+ */
+#define chan_to_DAC(a) ((a)&1)
+#define update_dacsr(a) outw(devpriv->dacsr|(a),dev->iobase+DT2821_DACSR)
+#define update_adcsr(a) outw(devpriv->adcsr|(a),dev->iobase+DT2821_ADCSR)
+#define mux_busy() (inw(dev->iobase+DT2821_ADCSR)&DT2821_MUXBUSY)
+#define ad_done() (inw(dev->iobase+DT2821_ADCSR)&DT2821_ADDONE)
+#define update_supcsr(a) outw(devpriv->supcsr|(a),dev->iobase+DT2821_SUPCSR)
+
+/*
+ * danger! macro abuse... a is the expression to wait on, and b is
+ * the statement(s) to execute if it doesn't happen.
+ */
+#define wait_for(a,b) \
+ do{ \
+ int _i; \
+ for(_i=0;_i<DT2821_TIMEOUT;_i++){ \
+ if(a){_i=0;break;} \
+ comedi_udelay(5); \
+ } \
+ if(_i){b} \
+ }while(0)
+
+static int dt282x_attach(comedi_device * dev, comedi_devconfig * it);
+static int dt282x_detach(comedi_device * dev);
+static comedi_driver driver_dt282x = {
+ driver_name:"dt282x",
+ module:THIS_MODULE,
+ attach:dt282x_attach,
+ detach:dt282x_detach,
+ board_name:&boardtypes[0].name,
+ num_names:n_boardtypes,
+ offset:sizeof(boardtype_t),
+};
+
+COMEDI_INITCLEANUP(driver_dt282x);
+
+static void free_resources(comedi_device * dev);
+static int prep_ai_dma(comedi_device * dev, int chan, int size);
+static int prep_ao_dma(comedi_device * dev, int chan, int size);
+static int dt282x_ai_cancel(comedi_device * dev, comedi_subdevice * s);
+static int dt282x_ao_cancel(comedi_device * dev, comedi_subdevice * s);
+static int dt282x_ns_to_timer(int *nanosec, int round_mode);
+static void dt282x_disable_dma(comedi_device * dev);
+
+static int dt282x_grab_dma(comedi_device * dev, int dma1, int dma2);
+
+static void dt282x_munge(comedi_device * dev, sampl_t * buf,
+ unsigned int nbytes)
+{
+ unsigned int i;
+ unsigned short mask = (1 << boardtype.adbits) - 1;
+ unsigned short sign = 1 << (boardtype.adbits - 1);
+ int n;
+
+ if (devpriv->ad_2scomp) {
+ sign = 1 << (boardtype.adbits - 1);
+ } else {
+ sign = 0;
+ }
+
+ if (nbytes % 2)
+ comedi_error(dev, "bug! odd number of bytes from dma xfer");
+ n = nbytes / 2;
+ for (i = 0; i < n; i++) {
+ buf[i] = (buf[i] & mask) ^ sign;
+ }
+}
+
+static void dt282x_ao_dma_interrupt(comedi_device * dev)
+{
+ void *ptr;
+ int size;
+ int i;
+ comedi_subdevice *s = dev->subdevices + 1;
+
+ update_supcsr(DT2821_CLRDMADNE);
+
+ if (!s->async->prealloc_buf) {
+ printk("async->data disappeared. dang!\n");
+ return;
+ }
+
+ i = devpriv->current_dma_index;
+ ptr = devpriv->dma[i].buf;
+
+ disable_dma(devpriv->dma[i].chan);
+
+ devpriv->current_dma_index = 1 - i;
+
+ size = cfc_read_array_from_buffer(s, ptr, devpriv->dma_maxsize);
+ if (size == 0) {
+ rt_printk("dt282x: AO underrun\n");
+ dt282x_ao_cancel(dev, s);
+ s->async->events |= COMEDI_CB_OVERFLOW;
+ return;
+ }
+ prep_ao_dma(dev, i, size);
+ return;
+}
+
+static void dt282x_ai_dma_interrupt(comedi_device * dev)
+{
+ void *ptr;
+ int size;
+ int i;
+ int ret;
+ comedi_subdevice *s = dev->subdevices;
+
+ update_supcsr(DT2821_CLRDMADNE);
+
+ if (!s->async->prealloc_buf) {
+ printk("async->data disappeared. dang!\n");
+ return;
+ }
+
+ i = devpriv->current_dma_index;
+ ptr = devpriv->dma[i].buf;
+ size = devpriv->dma[i].size;
+
+ disable_dma(devpriv->dma[i].chan);
+
+ devpriv->current_dma_index = 1 - i;
+
+ dt282x_munge(dev, ptr, size);
+ ret = cfc_write_array_to_buffer(s, ptr, size);
+ if (ret != size) {
+ dt282x_ai_cancel(dev, s);
+ return;
+ }
+ devpriv->nread -= size / 2;
+
+ if (devpriv->nread < 0) {
+ printk("dt282x: off by one\n");
+ devpriv->nread = 0;
+ }
+ if (!devpriv->nread) {
+ dt282x_ai_cancel(dev, s);
+ s->async->events |= COMEDI_CB_EOA;
+ return;
+ }
+#if 0
+ /* clear the dual dma flag, making this the last dma segment */
+ /* XXX probably wrong */
+ if (!devpriv->ntrig) {
+ devpriv->supcsr &= ~(DT2821_DDMA);
+ update_supcsr(0);
+ }
+#endif
+ /* restart the channel */
+ prep_ai_dma(dev, i, 0);
+}
+
+static int prep_ai_dma(comedi_device * dev, int dma_index, int n)
+{
+ int dma_chan;
+ unsigned long dma_ptr;
+ unsigned long flags;
+
+ if (!devpriv->ntrig)
+ return 0;
+
+ if (n == 0)
+ n = devpriv->dma_maxsize;
+ if (n > devpriv->ntrig * 2)
+ n = devpriv->ntrig * 2;
+ devpriv->ntrig -= n / 2;
+
+ devpriv->dma[dma_index].size = n;
+ dma_chan = devpriv->dma[dma_index].chan;
+ dma_ptr = virt_to_bus(devpriv->dma[dma_index].buf);
+
+ set_dma_mode(dma_chan, DMA_MODE_READ);
+ flags = claim_dma_lock();
+ clear_dma_ff(dma_chan);
+ set_dma_addr(dma_chan, dma_ptr);
+ set_dma_count(dma_chan, n);
+ release_dma_lock(flags);
+
+ enable_dma(dma_chan);
+
+ return n;
+}
+
+static int prep_ao_dma(comedi_device * dev, int dma_index, int n)
+{
+ int dma_chan;
+ unsigned long dma_ptr;
+ unsigned long flags;
+
+ devpriv->dma[dma_index].size = n;
+ dma_chan = devpriv->dma[dma_index].chan;
+ dma_ptr = virt_to_bus(devpriv->dma[dma_index].buf);
+
+ set_dma_mode(dma_chan, DMA_MODE_WRITE);
+ flags = claim_dma_lock();
+ clear_dma_ff(dma_chan);
+ set_dma_addr(dma_chan, dma_ptr);
+ set_dma_count(dma_chan, n);
+ release_dma_lock(flags);
+
+ enable_dma(dma_chan);
+
+ return n;
+}
+
+static irqreturn_t dt282x_interrupt(int irq, void *d PT_REGS_ARG)
+{
+ comedi_device *dev = d;
+ comedi_subdevice *s;
+ comedi_subdevice *s_ao;
+ unsigned int supcsr, adcsr, dacsr;
+ int handled = 0;
+
+ if (!dev->attached) {
+ comedi_error(dev, "spurious interrupt");
+ return IRQ_HANDLED;
+ }
+
+ s = dev->subdevices + 0;
+ s_ao = dev->subdevices + 1;
+ adcsr = inw(dev->iobase + DT2821_ADCSR);
+ dacsr = inw(dev->iobase + DT2821_DACSR);
+ supcsr = inw(dev->iobase + DT2821_SUPCSR);
+ if (supcsr & DT2821_DMAD) {
+ if (devpriv->dma_dir == DMA_MODE_READ)
+ dt282x_ai_dma_interrupt(dev);
+ else
+ dt282x_ao_dma_interrupt(dev);
+ handled = 1;
+ }
+ if (adcsr & DT2821_ADERR) {
+ if (devpriv->nread != 0) {
+ comedi_error(dev, "A/D error");
+ dt282x_ai_cancel(dev, s);
+ s->async->events |= COMEDI_CB_ERROR;
+ }
+ handled = 1;
+ }
+ if (dacsr & DT2821_DAERR) {
+#if 0
+ static int warn = 5;
+ if (--warn <= 0) {
+ disable_irq(dev->irq);
+ printk("disabling irq\n");
+ }
+#endif
+ comedi_error(dev, "D/A error");
+ dt282x_ao_cancel(dev, s_ao);
+ s->async->events |= COMEDI_CB_ERROR;
+ handled = 1;
+ }
+#if 0
+ if (adcsr & DT2821_ADDONE) {
+ int ret;
+ sampl_t data;
+
+ data = (sampl_t) inw(dev->iobase + DT2821_ADDAT);
+ data &= (1 << boardtype.adbits) - 1;
+ if (devpriv->ad_2scomp) {
+ data ^= 1 << (boardtype.adbits - 1);
+ }
+ ret = comedi_buf_put(s->async, data);
+ if (ret == 0) {
+ s->async->events |= COMEDI_CB_OVERFLOW;
+ }
+
+ devpriv->nread--;
+ if (!devpriv->nread) {
+ s->async->events |= COMEDI_CB_EOA;
+ } else {
+ if (supcsr & DT2821_SCDN)
+ update_supcsr(DT2821_STRIG);
+ }
+ handled = 1;
+ }
+#endif
+ comedi_event(dev, s);
+ /* printk("adcsr=0x%02x dacsr-0x%02x supcsr=0x%02x\n", adcsr, dacsr, supcsr); */
+ return IRQ_RETVAL(handled);
+}
+
+static void dt282x_load_changain(comedi_device * dev, int n,
+ unsigned int *chanlist)
+{
+ unsigned int i;
+ unsigned int chan, range;
+
+ outw(DT2821_LLE | (n - 1), dev->iobase + DT2821_CHANCSR);
+ for (i = 0; i < n; i++) {
+ chan = CR_CHAN(chanlist[i]);
+ range = CR_RANGE(chanlist[i]);
+ update_adcsr((range << 4) | (chan));
+ }
+ outw(n - 1, dev->iobase + DT2821_CHANCSR);
+}
+
+/*
+ * 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(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ int i;
+
+ /* XXX should we really be enabling the ad clock here? */
+ devpriv->adcsr = DT2821_ADCLK;
+ update_adcsr(0);
+
+ dt282x_load_changain(dev, 1, &insn->chanspec);
+
+ update_supcsr(DT2821_PRLD);
+ wait_for(!mux_busy(), comedi_error(dev, "timeout\n");
+ return -ETIME;
+ );
+
+ for (i = 0; i < insn->n; i++) {
+ update_supcsr(DT2821_STRIG);
+ wait_for(ad_done(), comedi_error(dev, "timeout\n");
+ return -ETIME;
+ );
+
+ data[i] =
+ inw(dev->iobase +
+ DT2821_ADDAT) & ((1 << boardtype.adbits) - 1);
+ if (devpriv->ad_2scomp)
+ data[i] ^= (1 << (boardtype.adbits - 1));
+ }
+
+ return i;
+}
+
+static int dt282x_ai_cmdtest(comedi_device * dev, comedi_subdevice * s,
+ comedi_cmd * cmd)
+{
+ int err = 0;
+ int tmp;
+
+ /* step 1: make sure trigger sources are trivially valid */
+
+ tmp = cmd->start_src;
+ cmd->start_src &= TRIG_NOW;
+ if (!cmd->start_src || tmp != cmd->start_src)
+ err++;
+
+ tmp = cmd->scan_begin_src;
+ cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_EXT;
+ if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
+ err++;
+
+ tmp = cmd->convert_src;
+ cmd->convert_src &= TRIG_TIMER;
+ 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_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 */
+
+ /* note that mutual compatiblity is not an issue here */
+ if (cmd->scan_begin_src != TRIG_FOLLOW &&
+ cmd->scan_begin_src != TRIG_EXT)
+ err++;
+ if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
+ 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->scan_begin_src == TRIG_FOLLOW) {
+ /* internal trigger */
+ if (cmd->scan_begin_arg != 0) {
+ cmd->scan_begin_arg = 0;
+ err++;
+ }
+ } else {
+ /* external trigger */
+ /* should be level/edge, hi/lo specification here */
+ if (cmd->scan_begin_arg != 0) {
+ cmd->scan_begin_arg = 0;
+ err++;
+ }
+ }
+ if (cmd->convert_arg < 4000) {
+ /* XXX board dependent */
+ cmd->convert_arg = 4000;
+ err++;
+ }
+#define SLOWEST_TIMER (250*(1<<15)*255)
+ if (cmd->convert_arg > SLOWEST_TIMER) {
+ cmd->convert_arg = SLOWEST_TIMER;
+ err++;
+ }
+ if (cmd->convert_arg < this_board->ai_speed) {
+ cmd->convert_arg = this_board->ai_speed;
+ err++;
+ }
+ if (cmd->scan_end_arg != cmd->chanlist_len) {
+ cmd->scan_end_arg = cmd->chanlist_len;
+ err++;
+ }
+ if (cmd->stop_src == TRIG_COUNT) {
+ /* any count is allowed */
+ } else {
+ /* TRIG_NONE */
+ if (cmd->stop_arg != 0) {
+ cmd->stop_arg = 0;
+ err++;
+ }
+ }
+
+ if (err)
+ return 3;
+
+ /* step 4: fix up any arguments */
+
+ tmp = cmd->convert_arg;
+ dt282x_ns_to_timer(&cmd->convert_arg, cmd->flags & TRIG_ROUND_MASK);
+ if (tmp != cmd->convert_arg)
+ err++;
+
+ if (err)
+ return 4;
+
+ return 0;
+}
+
+static int dt282x_ai_cmd(comedi_device * dev, comedi_subdevice * s)
+{
+ comedi_cmd *cmd = &s->async->cmd;
+ int timer;
+
+ if (devpriv->usedma == 0) {
+ comedi_error(dev,
+ "driver requires 2 dma channels to execute command");
+ return -EIO;
+ }
+
+ dt282x_disable_dma(dev);
+
+ if (cmd->convert_arg < this_board->ai_speed)
+ cmd->convert_arg = this_board->ai_speed;
+ timer = dt282x_ns_to_timer(&cmd->convert_arg, TRIG_ROUND_NEAREST);
+ outw(timer, dev->iobase + DT2821_TMRCTR);
+
+ if (cmd->scan_begin_src == TRIG_FOLLOW) {
+ /* internal trigger */
+ devpriv->supcsr = DT2821_ERRINTEN | DT2821_DS0;
+ } else {
+ /* external trigger */
+ devpriv->supcsr = DT2821_ERRINTEN | DT2821_DS0 | DT2821_DS1;
+ }
+ update_supcsr(DT2821_CLRDMADNE | DT2821_BUFFB | DT2821_ADCINIT);
+
+ devpriv->ntrig = cmd->stop_arg * cmd->scan_end_arg;
+ devpriv->nread = devpriv->ntrig;
+
+ devpriv->dma_dir = DMA_MODE_READ;
+ devpriv->current_dma_index = 0;
+ prep_ai_dma(dev, 0, 0);
+ if (devpriv->ntrig) {
+ prep_ai_dma(dev, 1, 0);
+ devpriv->supcsr |= DT2821_DDMA;
+ update_supcsr(0);
+ }
+
+ devpriv->adcsr = 0;
+
+ dt282x_load_changain(dev, cmd->chanlist_len, cmd->chanlist);
+
+ devpriv->adcsr = DT2821_ADCLK | DT2821_IADDONE;
+ update_adcsr(0);
+
+ update_supcsr(DT2821_PRLD);
+ wait_for(!mux_busy(), comedi_error(dev, "timeout\n");
+ return -ETIME;
+ );
+
+ if (cmd->scan_begin_src == TRIG_FOLLOW) {
+ update_supcsr(DT2821_STRIG);
+ } else {
+ devpriv->supcsr |= DT2821_XTRIG;
+ update_supcsr(0);
+ }
+
+ return 0;
+}
+
+static void dt282x_disable_dma(comedi_device * dev)
+{
+ if (devpriv->usedma) {
+ disable_dma(devpriv->dma[0].chan);
+ disable_dma(devpriv->dma[1].chan);
+ }
+}
+
+static int dt282x_ai_cancel(comedi_device * dev, comedi_subdevice * s)
+{
+ dt282x_disable_dma(dev);
+
+ devpriv->adcsr = 0;
+ update_adcsr(0);
+
+ devpriv->supcsr = 0;
+ update_supcsr(DT2821_ADCINIT);
+
+ return 0;
+}
+
+static int dt282x_ns_to_timer(int *nanosec, int round_mode)
+{
+ int prescale, base, divider;
+
+ for (prescale = 0; prescale < 16; prescale++) {
+ if (prescale == 1)
+ continue;
+ base = 250 * (1 << prescale);
+ switch (round_mode) {
+ case TRIG_ROUND_NEAREST:
+ default:
+ divider = (*nanosec + base / 2) / base;
+ break;
+ case TRIG_ROUND_DOWN:
+ divider = (*nanosec) / base;
+ break;
+ case TRIG_ROUND_UP:
+ divider = (*nanosec + base - 1) / base;
+ break;
+ }
+ if (divider < 256) {
+ *nanosec = divider * base;
+ return (prescale << 8) | (255 - divider);
+ }
+ }
+ base = 250 * (1 << 15);
+ divider = 255;
+ *nanosec = divider * base;
+ return (15 << 8) | (255 - divider);
+}
+
+/*
+ * Analog output routine. Selects single channel conversion,
+ * selects correct channel, converts from 2's compliment to
+ * offset binary if necessary, loads the data into the DAC
+ * data register, and performs the conversion.
+ */
+static int dt282x_ao_insn_read(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ data[0] = devpriv->ao[CR_CHAN(insn->chanspec)];
+
+ return 1;
+}
+
+static int dt282x_ao_insn_write(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ sampl_t d;
+ unsigned int chan;
+
+ chan = CR_CHAN(insn->chanspec);
+ d = data[0];
+ d &= (1 << boardtype.dabits) - 1;
+ devpriv->ao[chan] = d;
+
+ devpriv->dacsr |= DT2821_SSEL;
+
+ if (chan) {
+ /* select channel */
+ devpriv->dacsr |= DT2821_YSEL;
+ if (devpriv->da0_2scomp)
+ d ^= (1 << (boardtype.dabits - 1));
+ } else {
+ devpriv->dacsr &= ~DT2821_YSEL;
+ if (devpriv->da1_2scomp)
+ d ^= (1 << (boardtype.dabits - 1));
+ }
+
+ update_dacsr(0);
+
+ outw(d, dev->iobase + DT2821_DADAT);
+
+ update_supcsr(DT2821_DACON);
+
+ return 1;
+}
+
+static int dt282x_ao_cmdtest(comedi_device * dev, comedi_subdevice * s,
+ comedi_cmd * cmd)
+{
+ int err = 0;
+ int tmp;
+
+ /* step 1: make sure trigger sources are trivially valid */
+
+ tmp = cmd->start_src;
+ cmd->start_src &= TRIG_INT;
+ if (!cmd->start_src || tmp != cmd->start_src)
+ err++;
+
+ tmp = cmd->scan_begin_src;
+ cmd->scan_begin_src &= TRIG_TIMER;
+ if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
+ err++;
+
+ tmp = cmd->convert_src;
+ cmd->convert_src &= TRIG_NOW;
+ 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_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 */
+
+ /* note that mutual compatiblity is not an issue here */
+ if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
+ 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->scan_begin_arg < 5000 /* XXX unknown */ ) {
+ cmd->scan_begin_arg = 5000;
+ err++;
+ }
+ if (cmd->convert_arg != 0) {
+ cmd->convert_arg = 0;
+ err++;
+ }
+ if (cmd->scan_end_arg > 2) {
+ /* XXX chanlist stuff? */
+ cmd->scan_end_arg = 2;
+ err++;
+ }
+ if (cmd->stop_src == TRIG_COUNT) {
+ /* any count is allowed */
+ } else {
+ /* TRIG_NONE */
+ if (cmd->stop_arg != 0) {
+ cmd->stop_arg = 0;
+ err++;
+ }
+ }
+
+ if (err)
+ return 3;
+
+ /* step 4: fix up any arguments */
+
+ tmp = cmd->scan_begin_arg;
+ dt282x_ns_to_timer(&cmd->scan_begin_arg, cmd->flags & TRIG_ROUND_MASK);
+ if (tmp != cmd->scan_begin_arg)
+ err++;
+
+ if (err)
+ return 4;
+
+ return 0;
+
+}
+
+static int dt282x_ao_inttrig(comedi_device * dev, comedi_subdevice * s,
+ unsigned int x)
+{
+ int size;
+
+ if (x != 0)
+ return -EINVAL;
+
+ size = cfc_read_array_from_buffer(s, devpriv->dma[0].buf,
+ devpriv->dma_maxsize);
+ if (size == 0) {
+ rt_printk("dt282x: AO underrun\n");
+ return -EPIPE;
+ }
+ prep_ao_dma(dev, 0, size);
+
+ size = cfc_read_array_from_buffer(s, devpriv->dma[1].buf,
+ devpriv->dma_maxsize);
+ if (size == 0) {
+ rt_printk("dt282x: AO underrun\n");
+ return -EPIPE;
+ }
+ prep_ao_dma(dev, 1, size);
+
+ update_supcsr(DT2821_STRIG);
+ s->async->inttrig = NULL;
+
+ return 1;
+}
+
+static int dt282x_ao_cmd(comedi_device * dev, comedi_subdevice * s)
+{
+ int timer;
+ comedi_cmd *cmd = &s->async->cmd;
+
+ if (devpriv->usedma == 0) {
+ comedi_error(dev,
+ "driver requires 2 dma channels to execute command");
+ return -EIO;
+ }
+
+ dt282x_disable_dma(dev);
+
+ devpriv->supcsr = DT2821_ERRINTEN | DT2821_DS1 | DT2821_DDMA;
+ update_supcsr(DT2821_CLRDMADNE | DT2821_BUFFB | DT2821_DACINIT);
+
+ devpriv->ntrig = cmd->stop_arg * cmd->chanlist_len;
+ devpriv->nread = devpriv->ntrig;
+
+ devpriv->dma_dir = DMA_MODE_WRITE;
+ devpriv->current_dma_index = 0;
+
+ timer = dt282x_ns_to_timer(&cmd->scan_begin_arg, TRIG_ROUND_NEAREST);
+ outw(timer, dev->iobase + DT2821_TMRCTR);
+
+ devpriv->dacsr = DT2821_SSEL | DT2821_DACLK | DT2821_IDARDY;
+ update_dacsr(0);
+
+ s->async->inttrig = dt282x_ao_inttrig;
+
+ return 0;
+}
+
+static int dt282x_ao_cancel(comedi_device * dev, comedi_subdevice * s)
+{
+ dt282x_disable_dma(dev);
+
+ devpriv->dacsr = 0;
+ update_dacsr(0);
+
+ devpriv->supcsr = 0;
+ update_supcsr(DT2821_DACINIT);
+
+ return 0;
+}
+
+static int dt282x_dio_insn_bits(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ if (data[0]) {
+ s->state &= ~data[0];
+ s->state |= (data[0] & data[1]);
+
+ outw(s->state, dev->iobase + DT2821_DIODAT);
+ }
+ data[1] = inw(dev->iobase + DT2821_DIODAT);
+
+ return 2;
+}
+
+static int dt282x_dio_insn_config(comedi_device * dev, comedi_subdevice * s,
+ comedi_insn * insn, lsampl_t * data)
+{
+ int mask;
+
+ mask = (CR_CHAN(insn->chanspec) < 8) ? 0x00ff : 0xff00;
+ if (data[0])
+ s->io_bits |= mask;
+ else
+ s->io_bits &= ~mask;
+
+ if (s->io_bits & 0x00ff)
+ devpriv->dacsr |= DT2821_LBOE;
+ else
+ devpriv->dacsr &= ~DT2821_LBOE;
+ if (s->io_bits & 0xff00)
+ devpriv->dacsr |= DT2821_HBOE;
+ else
+ devpriv->dacsr &= ~DT2821_HBOE;
+
+ outw(devpriv->dacsr, dev->iobase + DT2821_DACSR);
+
+ return 1;
+}
+
+static const 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 comedi_lrange *const ai_range_pgl_table[] = {
+ &range_dt282x_ai_hi_bipolar,
+ &range_dt282x_ai_hi_unipolar
+};
+static const 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];
+ } else {
+ if (x < 0 || x >= 4)
+ x = 0;
+ return ai_range_table[x];
+ }
+}
+static const comedi_lrange *const ao_range_table[] = {
+ &range_bipolar10,
+ &range_unipolar10,
+ &range_bipolar5,
+ &range_unipolar5,
+ &range_bipolar2_5
+};
+static const comedi_lrange *opt_ao_range_lkup(int x)
+{
+ if (x < 0 || x >= 5)
+ x = 0;
+ return ao_range_table[x];
+}
+
+enum { opt_iobase = 0, opt_irq, opt_dma1, opt_dma2, /* i/o base, irq, dma channels */
+ opt_diff, /* differential */
+ opt_ai_twos, opt_ao0_twos, opt_ao1_twos, /* twos comp */
+ opt_ai_range, opt_ao0_range, opt_ao1_range, /* range */
+};
+
+/*
+ options:
+ 0 i/o base
+ 1 irq
+ 2 dma1
+ 3 dma2
+ 4 0=single ended, 1=differential
+ 5 ai 0=straight binary, 1=2's comp
+ 6 ao0 0=straight binary, 1=2's comp
+ 7 ao1 0=straight binary, 1=2's comp
+ 8 ai 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V
+ 9 ao0 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
+ 10 ao1 0=±10 V, 1=0-10 V, 2=±5 V, 3=0-5 V, 4=±2.5 V
+ */
+static int dt282x_attach(comedi_device * dev, comedi_devconfig * it)
+{
+ int i, irq;
+ int ret;
+ comedi_subdevice *s;
+ unsigned long iobase;
+
+ dev->board_name = this_board->name;
+
+ iobase = it->options[opt_iobase];
+ if (!iobase)
+ iobase = 0x240;
+
+ printk("comedi%d: dt282x: 0x%04lx", dev->minor, iobase);
+ if (!request_region(iobase, DT2821_SIZE, "dt282x")) {
+ printk(" I/O port conflict\n");
+ return -EBUSY;
+ }
+ dev->iobase = iobase;
+
+ outw(DT2821_BDINIT, dev->iobase + DT2821_SUPCSR);
+ i = inw(dev->iobase + DT2821_ADCSR);
+#ifdef DEBUG
+ printk(" fingerprint=%x,%x,%x,%x,%x",
+ inw(dev->iobase + DT2821_ADCSR),
+ inw(dev->iobase + DT2821_CHANCSR),
+ inw(dev->iobase + DT2821_DACSR),
+ inw(dev->iobase + DT2821_SUPCSR),
+ inw(dev->iobase + DT2821_TMRCTR));
+#endif
+
+ if (((inw(dev->iobase + DT2821_ADCSR) & DT2821_ADCSR_MASK)
+ != DT2821_ADCSR_VAL) ||
+ ((inw(dev->iobase + DT2821_CHANCSR) & DT2821_CHANCSR_MASK)
+ != DT2821_CHANCSR_VAL) ||
+ ((inw(dev->iobase + DT2821_DACSR) & DT2821_DACSR_MASK)
+ != DT2821_DACSR_VAL) ||
+ ((inw(dev->iobase + DT2821_SUPCSR) & DT2821_SUPCSR_MASK)
+ != DT2821_SUPCSR_VAL) ||
+ ((inw(dev->iobase + DT2821_TMRCTR) & DT2821_TMRCTR_MASK)
+ != DT2821_TMRCTR_VAL)) {
+ printk(" board not found");
+ return -EIO;
+ }
+ /* should do board test */
+
+ irq = it->options[opt_irq];
+#if 0
+ if (irq < 0) {
+ unsigned long flags;
+ int irqs;
+
+ save_flags(flags);
+ sti();
+ irqs = probe_irq_on();
+
+ /* trigger interrupt */
+
+ comedi_udelay(100);
+
+ irq = probe_irq_off(irqs);
+ restore_flags(flags);
+ if (0 /* error */ ) {
+ printk(" error probing irq (bad)");
+ }
+ }
+#endif
+ if (irq > 0) {
+ printk(" ( irq = %d )", irq);
+ ret = comedi_request_irq(irq, dt282x_interrupt, 0, "dt282x",
+ dev);
+ if (ret < 0) {
+ printk(" failed to get irq\n");
+ return -EIO;
+ }
+ dev->irq = irq;
+ } else if (irq == 0) {
+ printk(" (no irq)");
+ } else {
+#if 0
+ printk(" (probe returned multiple irqs--bad)");
+#else
+ printk(" (irq probe not implemented)");
+#endif
+ }
+
+ if ((ret = alloc_private(dev, sizeof(dt282x_private))) < 0)
+ return ret;
+
+ ret = dt282x_grab_dma(dev, it->options[opt_dma1],
+ it->options[opt_dma2]);
+ if (ret < 0)
+ return ret;
+
+ if ((ret = alloc_subdevices(dev, 3)) < 0)
+ return ret;
+
+ s = dev->subdevices + 0;
+
+ dev->read_subdev = s;
+ /* ai subdevice */
+ s->type = COMEDI_SUBD_AI;
+ s->subdev_flags = SDF_READABLE | SDF_CMD_READ |
+ ((it->options[opt_diff]) ? SDF_DIFF : SDF_COMMON);
+ s->n_chan =
+ (it->options[opt_diff]) ? boardtype.adchan_di : boardtype.
+ adchan_se;
+ s->insn_read = dt282x_ai_insn_read;
+ s->do_cmdtest = dt282x_ai_cmdtest;
+ s->do_cmd = dt282x_ai_cmd;
+ s->cancel = dt282x_ai_cancel;
+ s->maxdata = (1 << boardtype.adbits) - 1;
+ s->len_chanlist = 16;
+ s->range_table =
+ opt_ai_range_lkup(boardtype.ispgl, it->options[opt_ai_range]);
+ devpriv->ad_2scomp = it->options[opt_ai_twos];
+
+ s++;
+ if ((s->n_chan = boardtype.dachan)) {
+ /* ao subsystem */
+ s->type = COMEDI_SUBD_AO;
+ dev->write_subdev = s;
+ s->subdev_flags = SDF_WRITABLE | SDF_CMD_WRITE;
+ s->insn_read = dt282x_ao_insn_read;
+ s->insn_write = dt282x_ao_insn_write;
+ s->do_cmdtest = dt282x_ao_cmdtest;
+ s->do_cmd = dt282x_ao_cmd;
+ s->cancel = dt282x_ao_cancel;
+ s->maxdata = (1 << boardtype.dabits) - 1;
+ s->len_chanlist = 2;
+ s->range_table_list = devpriv->darangelist;
+ devpriv->darangelist[0] =
+ opt_ao_range_lkup(it->options[opt_ao0_range]);
+ devpriv->darangelist[1] =
+ opt_ao_range_lkup(it->options[opt_ao1_range]);
+ devpriv->da0_2scomp = it->options[opt_ao0_twos];
+ devpriv->da1_2scomp = it->options[opt_ao1_twos];
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
+ s++;
+ /* dio subsystem */
+ s->type = COMEDI_SUBD_DIO;
+ s->subdev_flags = SDF_READABLE | SDF_WRITABLE;
+ s->n_chan = 16;
+ s->insn_bits = dt282x_dio_insn_bits;
+ s->insn_config = dt282x_dio_insn_config;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+
+ printk("\n");
+
+ return 0;
+}
+
+static void free_resources(comedi_device * dev)
+{
+ if (dev->irq) {
+ comedi_free_irq(dev->irq, dev);
+ }
+ if (dev->iobase)
+ release_region(dev->iobase, DT2821_SIZE);
+ if (dev->private) {
+ if (devpriv->dma[0].chan)
+ free_dma(devpriv->dma[0].chan);
+ if (devpriv->dma[1].chan)
+ free_dma(devpriv->dma[1].chan);
+ if (devpriv->dma[0].buf)
+ free_page((unsigned long)devpriv->dma[0].buf);
+ if (devpriv->dma[1].buf)
+ free_page((unsigned long)devpriv->dma[1].buf);
+ }
+}
+
+static int dt282x_detach(comedi_device * dev)
+{
+ printk("comedi%d: dt282x: remove\n", dev->minor);
+
+ free_resources(dev);
+
+ return 0;
+}
+
+static int dt282x_grab_dma(comedi_device * dev, int dma1, int dma2)
+{
+ int ret;
+
+ devpriv->usedma = 0;
+
+ if (!dma1 && !dma2) {
+ printk(" (no dma)");
+ return 0;
+ }
+
+ if (dma1 == dma2 || dma1 < 5 || dma2 < 5 || dma1 > 7 || dma2 > 7)
+ return -EINVAL;
+
+ if (dma2 < dma1) {
+ int i;
+ i = dma1;
+ dma1 = dma2;
+ dma2 = i;
+ }
+
+ ret = request_dma(dma1, "dt282x A");
+ if (ret)
+ return -EBUSY;
+ devpriv->dma[0].chan = dma1;
+
+ ret = request_dma(dma2, "dt282x B");
+ if (ret)
+ return -EBUSY;
+ devpriv->dma[1].chan = dma2;
+
+ devpriv->dma_maxsize = PAGE_SIZE;
+ devpriv->dma[0].buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ devpriv->dma[1].buf = (void *)__get_free_page(GFP_KERNEL | GFP_DMA);
+ if (!devpriv->dma[0].buf || !devpriv->dma[1].buf) {
+ printk(" can't get DMA memory");
+ return -ENOMEM;
+ }
+
+ printk(" (dma=%d,%d)", dma1, dma2);
+
+ devpriv->usedma = 1;
+
+ return 0;
+}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff