s626.c 90.8 KB
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/*
  comedi/drivers/s626.c
  Sensoray s626 Comedi driver

  COMEDI - Linux Control and Measurement Device Interface
  Copyright (C) 2000 David A. Schleef <ds@schleef.org>

  Based on Sensoray Model 626 Linux driver Version 0.2
  Copyright (C) 2002-2004 Sensoray Co., Inc.

  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: s626
Description: Sensoray 626 driver
Devices: [Sensoray] 626 (s626)
Authors: Gianluca Palli <gpalli@deis.unibo.it>,
Updated: Fri, 15 Feb 2008 10:28:42 +0000
Status: experimental

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Configuration options: not applicable, uses PCI auto config
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INSN_CONFIG instructions:
  analog input:
   none

  analog output:
   none

  digital channel:
   s626 has 3 dio subdevices (2,3 and 4) each with 16 i/o channels
   supported configuration options:
   INSN_CONFIG_DIO_QUERY
   COMEDI_INPUT
   COMEDI_OUTPUT

  encoder:
   Every channel must be configured before reading.

   Example code

   insn.insn=INSN_CONFIG;   //configuration instruction
   insn.n=1;                //number of operation (must be 1)
   insn.data=&initialvalue; //initial value loaded into encoder
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				//during configuration
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   insn.subdev=5;           //encoder subdevice
   insn.chanspec=CR_PACK(encoder_channel,0,AREF_OTHER); //encoder_channel
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							//to configure
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   comedi_do_insn(cf,&insn); //executing configuration
*/

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#include <linux/interrupt.h>
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#include <linux/kernel.h>
#include <linux/types.h>

#include "../comedidev.h"

#include "comedi_fc.h"
#include "s626.h"

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#define PCI_VENDOR_ID_S626 0x1131
#define PCI_DEVICE_ID_S626 0x7146
#define PCI_SUBVENDOR_ID_S626 0x6000
#define PCI_SUBDEVICE_ID_S626 0x0272

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struct s626_private {
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	void __iomem *base_addr;
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	uint8_t ai_cmd_running;	/*  ai_cmd is running */
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	uint8_t ai_continous;	/*  continous acquisition */
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	int ai_sample_count;	/*  number of samples to acquire */
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	unsigned int ai_sample_timer;
	/*  time between samples in  units of the timer */
	int ai_convert_count;	/*  conversion counter */
	unsigned int ai_convert_timer;
	/*  time between conversion in  units of the timer */
	uint16_t CounterIntEnabs;
	/* Counter interrupt enable  mask for MISC2 register. */
	uint8_t AdcItems;	/* Number of items in ADC poll  list. */
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	struct bufferDMA RPSBuf;	/* DMA buffer used to hold ADC (RPS1) program. */
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	struct bufferDMA ANABuf;
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	/* DMA buffer used to receive ADC data and hold DAC data. */
	uint32_t *pDacWBuf;
	/* Pointer to logical adrs of DMA buffer used to hold DAC  data. */
	uint16_t Dacpol;	/* Image of DAC polarity register. */
	uint8_t TrimSetpoint[12];	/* Images of TrimDAC setpoints */
	uint16_t ChargeEnabled;	/* Image of MISC2 Battery */
	/* Charge Enabled (0 or WRMISC2_CHARGE_ENABLE). */
	uint16_t WDInterval;	/* Image of MISC2 watchdog interval control bits. */
	uint32_t I2CAdrs;
	/* I2C device address for onboard EEPROM (board rev dependent). */
	/*   short         I2Cards; */
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	unsigned int ao_readback[S626_DAC_CHANNELS];
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};
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struct dio_private {
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	uint16_t RDDIn;
	uint16_t WRDOut;
	uint16_t RDEdgSel;
	uint16_t WREdgSel;
	uint16_t RDCapSel;
	uint16_t WRCapSel;
	uint16_t RDCapFlg;
	uint16_t RDIntSel;
	uint16_t WRIntSel;
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};
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static struct dio_private dio_private_A = {
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	.RDDIn = LP_RDDINA,
	.WRDOut = LP_WRDOUTA,
	.RDEdgSel = LP_RDEDGSELA,
	.WREdgSel = LP_WREDGSELA,
	.RDCapSel = LP_RDCAPSELA,
	.WRCapSel = LP_WRCAPSELA,
	.RDCapFlg = LP_RDCAPFLGA,
	.RDIntSel = LP_RDINTSELA,
	.WRIntSel = LP_WRINTSELA,
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};

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static struct dio_private dio_private_B = {
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	.RDDIn = LP_RDDINB,
	.WRDOut = LP_WRDOUTB,
	.RDEdgSel = LP_RDEDGSELB,
	.WREdgSel = LP_WREDGSELB,
	.RDCapSel = LP_RDCAPSELB,
	.WRCapSel = LP_WRCAPSELB,
	.RDCapFlg = LP_RDCAPFLGB,
	.RDIntSel = LP_RDINTSELB,
	.WRIntSel = LP_WRINTSELB,
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};

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static struct dio_private dio_private_C = {
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	.RDDIn = LP_RDDINC,
	.WRDOut = LP_WRDOUTC,
	.RDEdgSel = LP_RDEDGSELC,
	.WREdgSel = LP_WREDGSELC,
	.RDCapSel = LP_RDCAPSELC,
	.WRCapSel = LP_WRCAPSELC,
	.RDCapFlg = LP_RDCAPFLGC,
	.RDIntSel = LP_RDINTSELC,
	.WRIntSel = LP_WRINTSELC,
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};

/* to group dio devices (48 bits mask and data are not allowed ???)
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static struct dio_private *dio_private_word[]={
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  &dio_private_A,
  &dio_private_B,
  &dio_private_C,
};
*/

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#define devpriv ((struct s626_private *)dev->private)
#define diopriv ((struct dio_private *)s->private)
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/*  COUNTER OBJECT ------------------------------------------------ */
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struct enc_private {
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	/*  Pointers to functions that differ for A and B counters: */
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	uint16_t(*GetEnable) (struct comedi_device *dev, struct enc_private *);	/* Return clock enable. */
	uint16_t(*GetIntSrc) (struct comedi_device *dev, struct enc_private *);	/* Return interrupt source. */
	uint16_t(*GetLoadTrig) (struct comedi_device *dev, struct enc_private *);	/* Return preload trigger source. */
	uint16_t(*GetMode) (struct comedi_device *dev, struct enc_private *);	/* Return standardized operating mode. */
	void (*PulseIndex) (struct comedi_device *dev, struct enc_private *);	/* Generate soft index strobe. */
	void (*SetEnable) (struct comedi_device *dev, struct enc_private *, uint16_t enab);	/* Program clock enable. */
	void (*SetIntSrc) (struct comedi_device *dev, struct enc_private *, uint16_t IntSource);	/* Program interrupt source. */
	void (*SetLoadTrig) (struct comedi_device *dev, struct enc_private *, uint16_t Trig);	/* Program preload trigger source. */
	void (*SetMode) (struct comedi_device *dev, struct enc_private *, uint16_t Setup, uint16_t DisableIntSrc);	/* Program standardized operating mode. */
	void (*ResetCapFlags) (struct comedi_device *dev, struct enc_private *);	/* Reset event capture flags. */
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	uint16_t MyCRA;		/*    Address of CRA register. */
	uint16_t MyCRB;		/*    Address of CRB register. */
	uint16_t MyLatchLsw;	/*    Address of Latch least-significant-word */
	/*    register. */
	uint16_t MyEventBits[4];	/*    Bit translations for IntSrc -->RDMISC2. */
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};
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#define encpriv ((struct enc_private *)(dev->subdevices+5)->private)
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/*  Counter overflow/index event flag masks for RDMISC2. */
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#define INDXMASK(C)		(1 << (((C) > 2) ? ((C) * 2 - 1) : ((C) * 2 +  4)))
#define OVERMASK(C)		(1 << (((C) > 2) ? ((C) * 2 + 5) : ((C) * 2 + 10)))
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#define EVBITS(C)		{ 0, OVERMASK(C), INDXMASK(C), OVERMASK(C) | INDXMASK(C) }

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/*  Translation table to map IntSrc into equivalent RDMISC2 event flag  bits. */
/* static const uint16_t EventBits[][4] = { EVBITS(0), EVBITS(1), EVBITS(2), EVBITS(3), EVBITS(4), EVBITS(5) }; */
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/*  enab/disable a function or test status bit(s) that are accessed */
/*  through Main Control Registers 1 or 2. */
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#define MC_ENABLE(REGADRS, CTRLWORD)	writel(((uint32_t)(CTRLWORD) << 16) | (uint32_t)(CTRLWORD), devpriv->base_addr+(REGADRS))
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#define MC_DISABLE(REGADRS, CTRLWORD)	writel((uint32_t)(CTRLWORD) << 16 , devpriv->base_addr+(REGADRS))
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#define MC_TEST(REGADRS, CTRLWORD)	((readl(devpriv->base_addr+(REGADRS)) & CTRLWORD) != 0)
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/* #define WR7146(REGARDS,CTRLWORD)
    writel(CTRLWORD,(uint32_t)(devpriv->base_addr+(REGARDS))) */
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#define WR7146(REGARDS, CTRLWORD) writel(CTRLWORD, devpriv->base_addr+(REGARDS))
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/* #define RR7146(REGARDS)
    readl((uint32_t)(devpriv->base_addr+(REGARDS))) */
#define RR7146(REGARDS)		readl(devpriv->base_addr+(REGARDS))

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#define BUGFIX_STREG(REGADRS)   (REGADRS - 4)
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/*  Write a time slot control record to TSL2. */
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#define VECTPORT(VECTNUM)		(P_TSL2 + ((VECTNUM) << 2))
#define SETVECT(VECTNUM, VECTVAL)	WR7146(VECTPORT(VECTNUM), (VECTVAL))
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/*  Code macros used for constructing I2C command bytes. */
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#define I2C_B2(ATTR, VAL)	(((ATTR) << 6) | ((VAL) << 24))
#define I2C_B1(ATTR, VAL)	(((ATTR) << 4) | ((VAL) << 16))
#define I2C_B0(ATTR, VAL)	(((ATTR) << 2) | ((VAL) <<  8))
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static const struct comedi_lrange s626_range_table = { 2, {
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							   RANGE(-5, 5),
							   RANGE(-10, 10),
							   }
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};

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/*  Execute a DEBI transfer.  This must be called from within a */
/*  critical section. */
static void DEBItransfer(struct comedi_device *dev)
{
	/*  Initiate upload of shadow RAM to DEBI control register. */
	MC_ENABLE(P_MC2, MC2_UPLD_DEBI);

	/*  Wait for completion of upload from shadow RAM to DEBI control */
	/*  register. */
	while (!MC_TEST(P_MC2, MC2_UPLD_DEBI))
		;

	/*  Wait until DEBI transfer is done. */
	while (RR7146(P_PSR) & PSR_DEBI_S)
		;
}

/*  Initialize the DEBI interface for all transfers. */

static uint16_t DEBIread(struct comedi_device *dev, uint16_t addr)
{
	uint16_t retval;

	/*  Set up DEBI control register value in shadow RAM. */
	WR7146(P_DEBICMD, DEBI_CMD_RDWORD | addr);

	/*  Execute the DEBI transfer. */
	DEBItransfer(dev);

	/*  Fetch target register value. */
	retval = (uint16_t) RR7146(P_DEBIAD);

	/*  Return register value. */
	return retval;
}

/*  Write a value to a gate array register. */
static void DEBIwrite(struct comedi_device *dev, uint16_t addr, uint16_t wdata)
{

	/*  Set up DEBI control register value in shadow RAM. */
	WR7146(P_DEBICMD, DEBI_CMD_WRWORD | addr);
	WR7146(P_DEBIAD, wdata);

	/*  Execute the DEBI transfer. */
	DEBItransfer(dev);
}

/* Replace the specified bits in a gate array register.  Imports: mask
 * specifies bits that are to be preserved, wdata is new value to be
 * or'd with the masked original.
 */
static void DEBIreplace(struct comedi_device *dev, uint16_t addr, uint16_t mask,
			uint16_t wdata)
{

	/*  Copy target gate array register into P_DEBIAD register. */
	WR7146(P_DEBICMD, DEBI_CMD_RDWORD | addr);
	/* Set up DEBI control reg value in shadow RAM. */
	DEBItransfer(dev);	/*  Execute the DEBI Read transfer. */

	/*  Write back the modified image. */
	WR7146(P_DEBICMD, DEBI_CMD_WRWORD | addr);
	/* Set up DEBI control reg value in shadow  RAM. */

	WR7146(P_DEBIAD, wdata | ((uint16_t) RR7146(P_DEBIAD) & mask));
	/* Modify the register image. */
	DEBItransfer(dev);	/*  Execute the DEBI Write transfer. */
}

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/* **************  EEPROM ACCESS FUNCTIONS  ************** */

static uint32_t I2Chandshake(struct comedi_device *dev, uint32_t val)
{
	/*  Write I2C command to I2C Transfer Control shadow register. */
	WR7146(P_I2CCTRL, val);

	/*  Upload I2C shadow registers into working registers and wait for */
	/*  upload confirmation. */

	MC_ENABLE(P_MC2, MC2_UPLD_IIC);
	while (!MC_TEST(P_MC2, MC2_UPLD_IIC))
		;

	/*  Wait until I2C bus transfer is finished or an error occurs. */
	while ((RR7146(P_I2CCTRL) & (I2C_BUSY | I2C_ERR)) == I2C_BUSY)
		;

	/*  Return non-zero if I2C error occurred. */
	return RR7146(P_I2CCTRL) & I2C_ERR;

}

/*  Read uint8_t from EEPROM. */
static uint8_t I2Cread(struct comedi_device *dev, uint8_t addr)
{
	uint8_t rtnval;

	/*  Send EEPROM target address. */
	if (I2Chandshake(dev, I2C_B2(I2C_ATTRSTART, I2CW)
			 /* Byte2 = I2C command: write to I2C EEPROM  device. */
			 | I2C_B1(I2C_ATTRSTOP, addr)
			 /* Byte1 = EEPROM internal target address. */
			 | I2C_B0(I2C_ATTRNOP, 0))) {	/*  Byte0 = Not sent. */
		/*  Abort function and declare error if handshake failed. */
		return 0;
	}
	/*  Execute EEPROM read. */
	if (I2Chandshake(dev, I2C_B2(I2C_ATTRSTART, I2CR)

			 /*  Byte2 = I2C */
			 /*  command: read */
			 /*  from I2C EEPROM */
			 /*  device. */
			 |I2C_B1(I2C_ATTRSTOP, 0)

			 /*  Byte1 receives */
			 /*  uint8_t from */
			 /*  EEPROM. */
			 |I2C_B0(I2C_ATTRNOP, 0))) {	/*  Byte0 = Not  sent. */

		/*  Abort function and declare error if handshake failed. */
		return 0;
	}
	/*  Return copy of EEPROM value. */
	rtnval = (uint8_t) (RR7146(P_I2CCTRL) >> 16);
	return rtnval;
}

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/* ***********  DAC FUNCTIONS *********** */

/*  Slot 0 base settings. */
#define VECT0	(XSD2 | RSD3 | SIB_A2)
/*  Slot 0 always shifts in  0xFF and store it to  FB_BUFFER2. */

/*  TrimDac LogicalChan-to-PhysicalChan mapping table. */
static uint8_t trimchan[] = { 10, 9, 8, 3, 2, 7, 6, 1, 0, 5, 4 };

/*  TrimDac LogicalChan-to-EepromAdrs mapping table. */
static uint8_t trimadrs[] = { 0x40, 0x41, 0x42, 0x50, 0x51, 0x52, 0x53, 0x60, 0x61, 0x62, 0x63 };

/* Private helper function: Transmit serial data to DAC via Audio
 * channel 2.  Assumes: (1) TSL2 slot records initialized, and (2)
 * Dacpol contains valid target image.
 */
static void SendDAC(struct comedi_device *dev, uint32_t val)
{

	/* START THE SERIAL CLOCK RUNNING ------------- */

	/* Assert DAC polarity control and enable gating of DAC serial clock
	 * and audio bit stream signals.  At this point in time we must be
	 * assured of being in time slot 0.  If we are not in slot 0, the
	 * serial clock and audio stream signals will be disabled; this is
	 * because the following DEBIwrite statement (which enables signals
	 * to be passed through the gate array) would execute before the
	 * trailing edge of WS1/WS3 (which turns off the signals), thus
	 * causing the signals to be inactive during the DAC write.
	 */
	DEBIwrite(dev, LP_DACPOL, devpriv->Dacpol);

	/* TRANSFER OUTPUT DWORD VALUE INTO A2'S OUTPUT FIFO ---------------- */

	/* Copy DAC setpoint value to DAC's output DMA buffer. */

	/* WR7146( (uint32_t)devpriv->pDacWBuf, val ); */
	*devpriv->pDacWBuf = val;

	/* enab the output DMA transfer.  This will cause the DMAC to copy
	 * the DAC's data value to A2's output FIFO.  The DMA transfer will
	 * then immediately terminate because the protection address is
	 * reached upon transfer of the first DWORD value.
	 */
	MC_ENABLE(P_MC1, MC1_A2OUT);

	/*  While the DMA transfer is executing ... */

	/* Reset Audio2 output FIFO's underflow flag (along with any other
	 * FIFO underflow/overflow flags).  When set, this flag will
	 * indicate that we have emerged from slot 0.
	 */
	WR7146(P_ISR, ISR_AFOU);

	/* Wait for the DMA transfer to finish so that there will be data
	 * available in the FIFO when time slot 1 tries to transfer a DWORD
	 * from the FIFO to the output buffer register.  We test for DMA
	 * Done by polling the DMAC enable flag; this flag is automatically
	 * cleared when the transfer has finished.
	 */
	while ((RR7146(P_MC1) & MC1_A2OUT) != 0)
		;

	/* START THE OUTPUT STREAM TO THE TARGET DAC -------------------- */

	/* FIFO data is now available, so we enable execution of time slots
	 * 1 and higher by clearing the EOS flag in slot 0.  Note that SD3
	 * will be shifted in and stored in FB_BUFFER2 for end-of-slot-list
	 * detection.
	 */
	SETVECT(0, XSD2 | RSD3 | SIB_A2);

	/* Wait for slot 1 to execute to ensure that the Packet will be
	 * transmitted.  This is detected by polling the Audio2 output FIFO
	 * underflow flag, which will be set when slot 1 execution has
	 * finished transferring the DAC's data DWORD from the output FIFO
	 * to the output buffer register.
	 */
	while ((RR7146(P_SSR) & SSR_AF2_OUT) == 0)
		;

	/* Set up to trap execution at slot 0 when the TSL sequencer cycles
	 * back to slot 0 after executing the EOS in slot 5.  Also,
	 * simultaneously shift out and in the 0x00 that is ALWAYS the value
	 * stored in the last byte to be shifted out of the FIFO's DWORD
	 * buffer register.
	 */
	SETVECT(0, XSD2 | XFIFO_2 | RSD2 | SIB_A2 | EOS);

	/* WAIT FOR THE TRANSACTION TO FINISH ----------------------- */

	/* Wait for the TSL to finish executing all time slots before
	 * exiting this function.  We must do this so that the next DAC
	 * write doesn't start, thereby enabling clock/chip select signals:
	 *
	 * 1. Before the TSL sequence cycles back to slot 0, which disables
	 *    the clock/cs signal gating and traps slot // list execution.
	 *    we have not yet finished slot 5 then the clock/cs signals are
	 *    still gated and we have not finished transmitting the stream.
	 *
	 * 2. While slots 2-5 are executing due to a late slot 0 trap.  In
	 *    this case, the slot sequence is currently repeating, but with
	 *    clock/cs signals disabled.  We must wait for slot 0 to trap
	 *    execution before setting up the next DAC setpoint DMA transfer
	 *    and enabling the clock/cs signals.  To detect the end of slot 5,
	 *    we test for the FB_BUFFER2 MSB contents to be equal to 0xFF.  If
	 *    the TSL has not yet finished executing slot 5 ...
	 */
	if ((RR7146(P_FB_BUFFER2) & 0xFF000000) != 0) {
		/* The trap was set on time and we are still executing somewhere
		 * in slots 2-5, so we now wait for slot 0 to execute and trap
		 * TSL execution.  This is detected when FB_BUFFER2 MSB changes
		 * from 0xFF to 0x00, which slot 0 causes to happen by shifting
		 * out/in on SD2 the 0x00 that is always referenced by slot 5.
		 */
		while ((RR7146(P_FB_BUFFER2) & 0xFF000000) != 0)
			;
	}
	/* Either (1) we were too late setting the slot 0 trap; the TSL
	 * sequencer restarted slot 0 before we could set the EOS trap flag,
	 * or (2) we were not late and execution is now trapped at slot 0.
	 * In either case, we must now change slot 0 so that it will store
	 * value 0xFF (instead of 0x00) to FB_BUFFER2 next time it executes.
	 * In order to do this, we reprogram slot 0 so that it will shift in
	 * SD3, which is driven only by a pull-up resistor.
	 */
	SETVECT(0, RSD3 | SIB_A2 | EOS);

	/* Wait for slot 0 to execute, at which time the TSL is setup for
	 * the next DAC write.  This is detected when FB_BUFFER2 MSB changes
	 * from 0x00 to 0xFF.
	 */
	while ((RR7146(P_FB_BUFFER2) & 0xFF000000) == 0)
		;
}

/*  Private helper function: Write setpoint to an application DAC channel. */
static void SetDAC(struct comedi_device *dev, uint16_t chan, short dacdata)
{
	register uint16_t signmask;
	register uint32_t WSImage;

	/*  Adjust DAC data polarity and set up Polarity Control Register */
	/*  image. */
	signmask = 1 << chan;
	if (dacdata < 0) {
		dacdata = -dacdata;
		devpriv->Dacpol |= signmask;
	} else
		devpriv->Dacpol &= ~signmask;

	/*  Limit DAC setpoint value to valid range. */
	if ((uint16_t) dacdata > 0x1FFF)
		dacdata = 0x1FFF;

	/* Set up TSL2 records (aka "vectors") for DAC update.  Vectors V2
	 * and V3 transmit the setpoint to the target DAC.  V4 and V5 send
	 * data to a non-existent TrimDac channel just to keep the clock
	 * running after sending data to the target DAC.  This is necessary
	 * to eliminate the clock glitch that would otherwise occur at the
	 * end of the target DAC's serial data stream.  When the sequence
	 * restarts at V0 (after executing V5), the gate array automatically
	 * disables gating for the DAC clock and all DAC chip selects.
	 */

	WSImage = (chan & 2) ? WS1 : WS2;
	/* Choose DAC chip select to be asserted. */
	SETVECT(2, XSD2 | XFIFO_1 | WSImage);
	/* Slot 2: Transmit high data byte to target DAC. */
	SETVECT(3, XSD2 | XFIFO_0 | WSImage);
	/* Slot 3: Transmit low data byte to target DAC. */
	SETVECT(4, XSD2 | XFIFO_3 | WS3);
	/* Slot 4: Transmit to non-existent TrimDac channel to keep clock */
	SETVECT(5, XSD2 | XFIFO_2 | WS3 | EOS);
	/* Slot 5: running after writing target DAC's low data byte. */

	/*  Construct and transmit target DAC's serial packet:
	 * ( A10D DDDD ),( DDDD DDDD ),( 0x0F ),( 0x00 ) where A is chan<0>,
	 * and D<12:0> is the DAC setpoint.  Append a WORD value (that writes
	 * to a  non-existent TrimDac channel) that serves to keep the clock
	 * running after the packet has been sent to the target DAC.
	 */
	SendDAC(dev, 0x0F000000
		/* Continue clock after target DAC data (write to non-existent trimdac). */
		| 0x00004000
		/* Address the two main dual-DAC devices (TSL's chip select enables
		 * target device). */
		| ((uint32_t) (chan & 1) << 15)
		/*  Address the DAC channel within the  device. */
		| (uint32_t) dacdata);	/*  Include DAC setpoint data. */

}

static void WriteTrimDAC(struct comedi_device *dev, uint8_t LogicalChan,
			 uint8_t DacData)
{
	uint32_t chan;

	/*  Save the new setpoint in case the application needs to read it back later. */
	devpriv->TrimSetpoint[LogicalChan] = (uint8_t) DacData;

	/*  Map logical channel number to physical channel number. */
	chan = (uint32_t) trimchan[LogicalChan];

	/* Set up TSL2 records for TrimDac write operation.  All slots shift
	 * 0xFF in from pulled-up SD3 so that the end of the slot sequence
	 * can be detected.
	 */

	SETVECT(2, XSD2 | XFIFO_1 | WS3);
	/* Slot 2: Send high uint8_t to target TrimDac. */
	SETVECT(3, XSD2 | XFIFO_0 | WS3);
	/* Slot 3: Send low uint8_t to target TrimDac. */
	SETVECT(4, XSD2 | XFIFO_3 | WS1);
	/* Slot 4: Send NOP high uint8_t to DAC0 to keep clock running. */
	SETVECT(5, XSD2 | XFIFO_2 | WS1 | EOS);
	/* Slot 5: Send NOP low  uint8_t to DAC0. */

	/* Construct and transmit target DAC's serial packet:
	 * ( 0000 AAAA ), ( DDDD DDDD ),( 0x00 ),( 0x00 ) where A<3:0> is the
	 * DAC channel's address, and D<7:0> is the DAC setpoint.  Append a
	 * WORD value (that writes a channel 0 NOP command to a non-existent
	 * main DAC channel) that serves to keep the clock running after the
	 * packet has been sent to the target DAC.
	 */

	/*  Address the DAC channel within the trimdac device. */
	SendDAC(dev, ((uint32_t) chan << 8)
		| (uint32_t) DacData);	/*  Include DAC setpoint data. */
}

static void LoadTrimDACs(struct comedi_device *dev)
{
	register uint8_t i;

	/*  Copy TrimDac setpoint values from EEPROM to TrimDacs. */
	for (i = 0; i < ARRAY_SIZE(trimchan); i++)
		WriteTrimDAC(dev, i, I2Cread(dev, trimadrs[i]));
}

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/* ******  COUNTER FUNCTIONS  ******* */
/* All counter functions address a specific counter by means of the
 * "Counter" argument, which is a logical counter number.  The Counter
 * argument may have any of the following legal values: 0=0A, 1=1A,
 * 2=2A, 3=0B, 4=1B, 5=2B.
 */

/*  Read a counter's output latch. */
static uint32_t ReadLatch(struct comedi_device *dev, struct enc_private *k)
{
	register uint32_t value;

	/*  Latch counts and fetch LSW of latched counts value. */
	value = (uint32_t) DEBIread(dev, k->MyLatchLsw);

	/*  Fetch MSW of latched counts and combine with LSW. */
	value |= ((uint32_t) DEBIread(dev, k->MyLatchLsw + 2) << 16);

	/*  Return latched counts. */
	return value;
}

/* Return/set a counter pair's latch trigger source.  0: On read
 * access, 1: A index latches A, 2: B index latches B, 3: A overflow
 * latches B.
 */
static void SetLatchSource(struct comedi_device *dev, struct enc_private *k,
			   uint16_t value)
{
	DEBIreplace(dev, k->MyCRB,
		    (uint16_t) (~(CRBMSK_INTCTRL | CRBMSK_LATCHSRC)),
		    (uint16_t) (value << CRBBIT_LATCHSRC));
}

/*  Write value into counter preload register. */
static void Preload(struct comedi_device *dev, struct enc_private *k,
		    uint32_t value)
{
640
	DEBIwrite(dev, (uint16_t) (k->MyLatchLsw), (uint16_t) value);
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	DEBIwrite(dev, (uint16_t) (k->MyLatchLsw + 2),
		  (uint16_t) (value >> 16));
}

645
static unsigned int s626_ai_reg_to_uint(int data)
646
{
647
	unsigned int tempdata;
648

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	tempdata = (data >> 18);
	if (tempdata & 0x2000)
		tempdata &= 0x1fff;
	else
		tempdata += (1 << 13);
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	return tempdata;
}
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/* static unsigned int s626_uint_to_reg(struct comedi_subdevice *s, int data){ */
/*   return 0; */
/* } */
661

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static int s626_dio_set_irq(struct comedi_device *dev, unsigned int chan)
{
	unsigned int group;
	unsigned int bitmask;
	unsigned int status;

	/* select dio bank */
	group = chan / 16;
	bitmask = 1 << (chan - (16 * group));

	/* set channel to capture positive edge */
	status = DEBIread(dev,
			  ((struct dio_private *)(dev->subdevices + 2 +
						  group)->private)->RDEdgSel);
	DEBIwrite(dev,
		  ((struct dio_private *)(dev->subdevices + 2 +
					  group)->private)->WREdgSel,
		  bitmask | status);

	/* enable interrupt on selected channel */
	status = DEBIread(dev,
			  ((struct dio_private *)(dev->subdevices + 2 +
						  group)->private)->RDIntSel);
	DEBIwrite(dev,
		  ((struct dio_private *)(dev->subdevices + 2 +
					  group)->private)->WRIntSel,
		  bitmask | status);

	/* enable edge capture write command */
	DEBIwrite(dev, LP_MISC1, MISC1_EDCAP);

	/* enable edge capture on selected channel */
	status = DEBIread(dev,
			  ((struct dio_private *)(dev->subdevices + 2 +
						  group)->private)->RDCapSel);
	DEBIwrite(dev,
		  ((struct dio_private *)(dev->subdevices + 2 +
					  group)->private)->WRCapSel,
		  bitmask | status);

	return 0;
}

static int s626_dio_reset_irq(struct comedi_device *dev, unsigned int group,
			      unsigned int mask)
{
	/* disable edge capture write command */
	DEBIwrite(dev, LP_MISC1, MISC1_NOEDCAP);

	/* enable edge capture on selected channel */
	DEBIwrite(dev,
		  ((struct dio_private *)(dev->subdevices + 2 +
					  group)->private)->WRCapSel, mask);

	return 0;
}

static int s626_dio_clear_irq(struct comedi_device *dev)
{
	unsigned int group;

	/* disable edge capture write command */
	DEBIwrite(dev, LP_MISC1, MISC1_NOEDCAP);

	for (group = 0; group < S626_DIO_BANKS; group++) {
		/* clear pending events and interrupt */
		DEBIwrite(dev,
			  ((struct dio_private *)(dev->subdevices + 2 +
						  group)->private)->WRCapSel,
			  0xffff);
	}

	return 0;
}

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static irqreturn_t s626_irq_handler(int irq, void *d)
{
	struct comedi_device *dev = d;
	struct comedi_subdevice *s;
	struct comedi_cmd *cmd;
	struct enc_private *k;
	unsigned long flags;
	int32_t *readaddr;
	uint32_t irqtype, irqstatus;
	int i = 0;
	short tempdata;
	uint8_t group;
	uint16_t irqbit;
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	if (dev->attached == 0)
		return IRQ_NONE;
	/*  lock to avoid race with comedi_poll */
	spin_lock_irqsave(&dev->spinlock, flags);
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	/* save interrupt enable register state */
	irqstatus = readl(devpriv->base_addr + P_IER);
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	/* read interrupt type */
	irqtype = readl(devpriv->base_addr + P_ISR);
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	/* disable master interrupt */
	writel(0, devpriv->base_addr + P_IER);
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	/* clear interrupt */
	writel(irqtype, devpriv->base_addr + P_ISR);
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	switch (irqtype) {
	case IRQ_RPS1:		/*  end_of_scan occurs */
		/*  manage ai subdevice */
		s = dev->subdevices;
		cmd = &(s->async->cmd);
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		/* Init ptr to DMA buffer that holds new ADC data.  We skip the
		 * first uint16_t in the buffer because it contains junk data from
		 * the final ADC of the previous poll list scan.
		 */
		readaddr = (int32_t *) devpriv->ANABuf.LogicalBase + 1;
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		/*  get the data and hand it over to comedi */
		for (i = 0; i < (s->async->cmd.chanlist_len); i++) {
			/*  Convert ADC data to 16-bit integer values and copy to application */
			/*  buffer. */
			tempdata = s626_ai_reg_to_uint((int)*readaddr);
			readaddr++;
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			/* put data into read buffer */
			/*  comedi_buf_put(s->async, tempdata); */
			if (cfc_write_to_buffer(s, tempdata) == 0)
				printk
				    ("s626_irq_handler: cfc_write_to_buffer error!\n");
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		}

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		/* end of scan occurs */
		s->async->events |= COMEDI_CB_EOS;
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		if (!(devpriv->ai_continous))
			devpriv->ai_sample_count--;
		if (devpriv->ai_sample_count <= 0) {
			devpriv->ai_cmd_running = 0;
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			/*  Stop RPS program. */
			MC_DISABLE(P_MC1, MC1_ERPS1);
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			/* send end of acquisition */
			s->async->events |= COMEDI_CB_EOA;
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			/* disable master interrupt */
			irqstatus = 0;
		}
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		if (devpriv->ai_cmd_running && cmd->scan_begin_src == TRIG_EXT)
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			s626_dio_set_irq(dev, cmd->scan_begin_arg);
		/*  tell comedi that data is there */
		comedi_event(dev, s);
		break;
	case IRQ_GPIO3:	/* check dio and conter interrupt */
		/*  manage ai subdevice */
		s = dev->subdevices;
		cmd = &(s->async->cmd);
821

822
		/* s626_dio_clear_irq(dev); */
823

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		for (group = 0; group < S626_DIO_BANKS; group++) {
			irqbit = 0;
			/* read interrupt type */
			irqbit = DEBIread(dev,
					  ((struct dio_private *)(dev->
								  subdevices +
								  2 +
								  group)->
					   private)->RDCapFlg);
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			/* check if interrupt is generated from dio channels */
			if (irqbit) {
				s626_dio_reset_irq(dev, group, irqbit);
				if (devpriv->ai_cmd_running) {
					/* check if interrupt is an ai acquisition start trigger */
					if ((irqbit >> (cmd->start_arg -
							(16 * group)))
					    == 1 && cmd->start_src == TRIG_EXT) {
						/*  Start executing the RPS program. */
						MC_ENABLE(P_MC1, MC1_ERPS1);
844

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						if (cmd->scan_begin_src ==
						    TRIG_EXT) {
							s626_dio_set_irq(dev,
									 cmd->scan_begin_arg);
						}
					}
					if ((irqbit >> (cmd->scan_begin_arg -
							(16 * group)))
					    == 1
					    && cmd->scan_begin_src ==
					    TRIG_EXT) {
						/*  Trigger ADC scan loop start by setting RPS Signal 0. */
						MC_ENABLE(P_MC2, MC2_ADC_RPS);
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						if (cmd->convert_src ==
						    TRIG_EXT) {
							devpriv->ai_convert_count
							    = cmd->chanlist_len;
863

864
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							s626_dio_set_irq(dev,
									 cmd->convert_arg);
						}
867

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						if (cmd->convert_src ==
						    TRIG_TIMER) {
							k = &encpriv[5];
							devpriv->ai_convert_count
							    = cmd->chanlist_len;
							k->SetEnable(dev, k,
								     CLKENAB_ALWAYS);
						}
					}
					if ((irqbit >> (cmd->convert_arg -
							(16 * group)))
					    == 1
					    && cmd->convert_src == TRIG_EXT) {
						/*  Trigger ADC scan loop start by setting RPS Signal 0. */
						MC_ENABLE(P_MC2, MC2_ADC_RPS);
883

884
						devpriv->ai_convert_count--;
885

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895
						if (devpriv->ai_convert_count >
						    0) {
							s626_dio_set_irq(dev,
									 cmd->convert_arg);
						}
					}
				}
				break;
			}
		}
896

897
898
		/* read interrupt type */
		irqbit = DEBIread(dev, LP_RDMISC2);
899

900
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902
		/* check interrupt on counters */
		if (irqbit & IRQ_COINT1A) {
			k = &encpriv[0];
903

904
905
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908
			/* clear interrupt capture flag */
			k->ResetCapFlags(dev, k);
		}
		if (irqbit & IRQ_COINT2A) {
			k = &encpriv[1];
909

910
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914
			/* clear interrupt capture flag */
			k->ResetCapFlags(dev, k);
		}
		if (irqbit & IRQ_COINT3A) {
			k = &encpriv[2];
915

916
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			/* clear interrupt capture flag */
			k->ResetCapFlags(dev, k);
		}
		if (irqbit & IRQ_COINT1B) {
			k = &encpriv[3];
921

922
923
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926
			/* clear interrupt capture flag */
			k->ResetCapFlags(dev, k);
		}
		if (irqbit & IRQ_COINT2B) {
			k = &encpriv[4];
927

928
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			/* clear interrupt capture flag */
			k->ResetCapFlags(dev, k);
930

931
932
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934
			if (devpriv->ai_convert_count > 0) {
				devpriv->ai_convert_count--;
				if (devpriv->ai_convert_count == 0)
					k->SetEnable(dev, k, CLKENAB_INDEX);
935

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943
				if (cmd->convert_src == TRIG_TIMER) {
					/*  Trigger ADC scan loop start by setting RPS Signal 0. */
					MC_ENABLE(P_MC2, MC2_ADC_RPS);
				}
			}
		}
		if (irqbit & IRQ_COINT3B) {
			k = &encpriv[5];
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945
946
			/* clear interrupt capture flag */
			k->ResetCapFlags(dev, k);
947

948
949
950
951
			if (cmd->scan_begin_src == TRIG_TIMER) {
				/*  Trigger ADC scan loop start by setting RPS Signal 0. */
				MC_ENABLE(P_MC2, MC2_ADC_RPS);
			}
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959
			if (cmd->convert_src == TRIG_TIMER) {
				k = &encpriv[4];
				devpriv->ai_convert_count = cmd->chanlist_len;
				k->SetEnable(dev, k, CLKENAB_ALWAYS);
			}
		}
	}
960

961
962
	/* enable interrupt */
	writel(irqstatus, devpriv->base_addr + P_IER);
963

964
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966
	spin_unlock_irqrestore(&dev->spinlock, flags);
	return IRQ_HANDLED;
}
967

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975
976
977
978
/*
 * this functions build the RPS program for hardware driven acquistion
 */
static void ResetADC(struct comedi_device *dev, uint8_t *ppl)
{
	register uint32_t *pRPS;
	uint32_t JmpAdrs;
	uint16_t i;
	uint16_t n;
	uint32_t LocalPPL;
	struct comedi_cmd *cmd = &(dev->subdevices->async->cmd);
979

980
981
	/*  Stop RPS program in case it is currently running. */
	MC_DISABLE(P_MC1, MC1_ERPS1);
982

983
984
	/*  Set starting logical address to write RPS commands. */
	pRPS = (uint32_t *) devpriv->RPSBuf.LogicalBase;
985

986
987
	/*  Initialize RPS instruction pointer. */
	WR7146(P_RPSADDR1, (uint32_t) devpriv->RPSBuf.PhysicalBase);
988

989
	/*  Construct RPS program in RPSBuf DMA buffer */
990

991
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993
994
995
	if (cmd != NULL && cmd->scan_begin_src != TRIG_FOLLOW) {
		/*  Wait for Start trigger. */
		*pRPS++ = RPS_PAUSE | RPS_SIGADC;
		*pRPS++ = RPS_CLRSIGNAL | RPS_SIGADC;
	}
996

997
998
999
1000
	/* SAA7146 BUG WORKAROUND Do a dummy DEBI Write.  This is necessary
	 * because the first RPS DEBI Write following a non-RPS DEBI write
	 * seems to always fail.  If we don't do this dummy write, the ADC
	 * gain might not be set to the value required for the first slot in
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