diff options
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_at_a2150.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_at_a2150.c | 273 |
1 files changed, 134 insertions, 139 deletions
diff --git a/drivers/staging/comedi/drivers/ni_at_a2150.c b/drivers/staging/comedi/drivers/ni_at_a2150.c index 9b444f8c4e33..5a4dcc6e61d8 100644 --- a/drivers/staging/comedi/drivers/ni_at_a2150.c +++ b/drivers/staging/comedi/drivers/ni_at_a2150.c @@ -1,62 +1,47 @@ /* - comedi/drivers/ni_at_a2150.c - Driver for National Instruments AT-A2150 boards - Copyright (C) 2001, 2002 Frank Mori Hess <fmhess@users.sourceforge.net> - - COMEDI - Linux Control and Measurement Device Interface - Copyright (C) 2000 David A. Schleef <ds@schleef.org> - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. -*/ -/* -Driver: ni_at_a2150 -Description: National Instruments AT-A2150 -Author: Frank Mori Hess -Status: works -Devices: [National Instruments] AT-A2150C (at_a2150c), AT-2150S (at_a2150s) - -If you want to ac couple the board's inputs, use AREF_OTHER. - -Configuration options: - [0] - I/O port base address - [1] - IRQ (optional, required for timed conversions) - [2] - DMA (optional, required for timed conversions) + * Comedi driver for National Instruments AT-A2150 boards + * Copyright (C) 2001, 2002 Frank Mori Hess <fmhess@users.sourceforge.net> + * + * COMEDI - Linux Control and Measurement Device Interface + * Copyright (C) 2000 David A. Schleef <ds@schleef.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ -*/ /* -Yet another driver for obsolete hardware brought to you by Frank Hess. -Testing and debugging help provided by Dave Andruczyk. - -This driver supports the boards: - -AT-A2150C -AT-A2150S - -The only difference is their master clock frequencies. - -Options: - [0] - base io address - [1] - irq - [2] - dma channel - -References (from ftp://ftp.natinst.com/support/manuals): - - 320360.pdf AT-A2150 User Manual - -TODO: - -analog level triggering -TRIG_WAKE_EOS - -*/ + * Driver: ni_at_a2150 + * Description: National Instruments AT-A2150 + * Author: Frank Mori Hess + * Status: works + * Devices: [National Instruments] AT-A2150C (at_a2150c), AT-2150S (at_a2150s) + * + * Configuration options: + * [0] - I/O port base address + * [1] - IRQ (optional, required for timed conversions) + * [2] - DMA (optional, required for timed conversions) + * + * Yet another driver for obsolete hardware brought to you by Frank Hess. + * Testing and debugging help provided by Dave Andruczyk. + * + * If you want to ac couple the board's inputs, use AREF_OTHER. + * + * The only difference in the boards is their master clock frequencies. + * + * References (from ftp://ftp.natinst.com/support/manuals): + * 320360.pdf AT-A2150 User Manual + * + * TODO: + * - analog level triggering + * - TRIG_WAKE_EOS + */ #include <linux/module.h> #include <linux/delay.h> @@ -73,48 +58,52 @@ TRIG_WAKE_EOS /* Registers and bits */ #define CONFIG_REG 0x0 -#define CHANNEL_BITS(x) ((x) & 0x7) +#define CHANNEL_BITS(x) ((x) & 0x7) #define CHANNEL_MASK 0x7 -#define CLOCK_SELECT_BITS(x) (((x) & 0x3) << 3) -#define CLOCK_DIVISOR_BITS(x) (((x) & 0x3) << 5) +#define CLOCK_SELECT_BITS(x) (((x) & 0x3) << 3) +#define CLOCK_DIVISOR_BITS(x) (((x) & 0x3) << 5) #define CLOCK_MASK (0xf << 3) -#define ENABLE0_BIT 0x80 /* enable (don't internally ground) channels 0 and 1 */ -#define ENABLE1_BIT 0x100 /* enable (don't internally ground) channels 2 and 3 */ -#define AC0_BIT 0x200 /* ac couple channels 0,1 */ -#define AC1_BIT 0x400 /* ac couple channels 2,3 */ -#define APD_BIT 0x800 /* analog power down */ -#define DPD_BIT 0x1000 /* digital power down */ -#define TRIGGER_REG 0x2 /* trigger config register */ -#define POST_TRIGGER_BITS 0x2 -#define DELAY_TRIGGER_BITS 0x3 -#define HW_TRIG_EN 0x10 /* enable hardware trigger */ -#define FIFO_START_REG 0x6 /* software start aquistion trigger */ -#define FIFO_RESET_REG 0x8 /* clears fifo + fifo flags */ -#define FIFO_DATA_REG 0xa /* read data */ -#define DMA_TC_CLEAR_REG 0xe /* clear dma terminal count interrupt */ -#define STATUS_REG 0x12 /* read only */ -#define FNE_BIT 0x1 /* fifo not empty */ -#define OVFL_BIT 0x8 /* fifo overflow */ -#define EDAQ_BIT 0x10 /* end of acquisition interrupt */ -#define DCAL_BIT 0x20 /* offset calibration in progress */ -#define INTR_BIT 0x40 /* interrupt has occurred */ -#define DMA_TC_BIT 0x80 /* dma terminal count interrupt has occurred */ -#define ID_BITS(x) (((x) >> 8) & 0x3) -#define IRQ_DMA_CNTRL_REG 0x12 /* write only */ -#define DMA_CHAN_BITS(x) ((x) & 0x7) /* sets dma channel */ -#define DMA_EN_BIT 0x8 /* enables dma */ -#define IRQ_LVL_BITS(x) (((x) & 0xf) << 4) /* sets irq level */ -#define FIFO_INTR_EN_BIT 0x100 /* enable fifo interrupts */ -#define FIFO_INTR_FHF_BIT 0x200 /* interrupt fifo half full */ -#define DMA_INTR_EN_BIT 0x800 /* enable interrupt on dma terminal count */ -#define DMA_DEM_EN_BIT 0x1000 /* enables demand mode dma */ +/* enable (don't internally ground) channels 0 and 1 */ +#define ENABLE0_BIT 0x80 +/* enable (don't internally ground) channels 2 and 3 */ +#define ENABLE1_BIT 0x100 +#define AC0_BIT 0x200 /* ac couple channels 0,1 */ +#define AC1_BIT 0x400 /* ac couple channels 2,3 */ +#define APD_BIT 0x800 /* analog power down */ +#define DPD_BIT 0x1000 /* digital power down */ +#define TRIGGER_REG 0x2 /* trigger config register */ +#define POST_TRIGGER_BITS 0x2 +#define DELAY_TRIGGER_BITS 0x3 +#define HW_TRIG_EN 0x10 /* enable hardware trigger */ +#define FIFO_START_REG 0x6 /* software start aquistion trigger */ +#define FIFO_RESET_REG 0x8 /* clears fifo + fifo flags */ +#define FIFO_DATA_REG 0xa /* read data */ +#define DMA_TC_CLEAR_REG 0xe /* clear dma terminal count interrupt */ +#define STATUS_REG 0x12 /* read only */ +#define FNE_BIT 0x1 /* fifo not empty */ +#define OVFL_BIT 0x8 /* fifo overflow */ +#define EDAQ_BIT 0x10 /* end of acquisition interrupt */ +#define DCAL_BIT 0x20 /* offset calibration in progress */ +#define INTR_BIT 0x40 /* interrupt has occurred */ +/* dma terminal count interrupt has occurred */ +#define DMA_TC_BIT 0x80 +#define ID_BITS(x) (((x) >> 8) & 0x3) +#define IRQ_DMA_CNTRL_REG 0x12 /* write only */ +#define DMA_CHAN_BITS(x) ((x) & 0x7) /* sets dma channel */ +#define DMA_EN_BIT 0x8 /* enables dma */ +#define IRQ_LVL_BITS(x) (((x) & 0xf) << 4) /* sets irq level */ +#define FIFO_INTR_EN_BIT 0x100 /* enable fifo interrupts */ +#define FIFO_INTR_FHF_BIT 0x200 /* interrupt fifo half full */ +/* enable interrupt on dma terminal count */ +#define DMA_INTR_EN_BIT 0x800 +#define DMA_DEM_EN_BIT 0x1000 /* enables demand mode dma */ #define I8253_BASE_REG 0x14 struct a2150_board { const char *name; - int clock[4]; /* master clock periods, in nanoseconds */ - int num_clocks; /* number of available master clock speeds */ - int ai_speed; /* maximum conversion rate in nanoseconds */ + int clock[4]; /* master clock periods, in nanoseconds */ + int num_clocks; /* number of available master clock speeds */ + int ai_speed; /* maximum conversion rate in nanoseconds */ }; /* analog input range */ @@ -144,8 +133,8 @@ static const struct a2150_board a2150_boards[] = { struct a2150_private { struct comedi_isadma *dma; unsigned int count; /* number of data points left to be taken */ - int irq_dma_bits; /* irq/dma register bits */ - int config_bits; /* config register bits */ + int irq_dma_bits; /* irq/dma register bits */ + int config_bits; /* config register bits */ }; /* interrupt service routine */ @@ -189,13 +178,13 @@ static irqreturn_t a2150_interrupt(int irq, void *d) */ residue = comedi_isadma_disable(desc->chan); - /* figure out how many points to read */ + /* figure out how many points to read */ max_points = comedi_bytes_to_samples(s, desc->size); num_points = max_points - comedi_bytes_to_samples(s, residue); if (devpriv->count < num_points && cmd->stop_src == TRIG_COUNT) num_points = devpriv->count; - /* figure out how many points will be stored next time */ + /* figure out how many points will be stored next time */ leftover = 0; if (cmd->stop_src == TRIG_NONE) { leftover = comedi_bytes_to_samples(s, desc->size); @@ -204,7 +193,8 @@ static irqreturn_t a2150_interrupt(int irq, void *d) if (leftover > max_points) leftover = max_points; } - /* there should only be a residue if collection was stopped by having + /* + * There should only be a residue if collection was stopped by having * the stop_src set to an external trigger, in which case there * will be no more data */ @@ -214,7 +204,7 @@ static irqreturn_t a2150_interrupt(int irq, void *d) for (i = 0; i < num_points; i++) { /* write data point to comedi buffer */ dpnt = buf[i]; - /* convert from 2's complement to unsigned coding */ + /* convert from 2's complement to unsigned coding */ dpnt ^= 0x8000; comedi_buf_write_samples(s, &dpnt, 1); if (cmd->stop_src == TRIG_COUNT) { @@ -244,14 +234,14 @@ static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s) struct comedi_isadma *dma = devpriv->dma; struct comedi_isadma_desc *desc = &dma->desc[0]; - /* disable dma on card */ + /* disable dma on card */ devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); - /* disable computer's dma */ + /* disable computer's dma */ comedi_isadma_disable(desc->chan); - /* clear fifo and reset triggering circuitry */ + /* clear fifo and reset triggering circuitry */ outw(0, dev->iobase + FIFO_RESET_REG); return 0; @@ -270,7 +260,7 @@ static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, int lub_divisor_shift, lub_index, glb_divisor_shift, glb_index; int i, j; - /* initialize greatest lower and least upper bounds */ + /* initialize greatest lower and least upper bounds */ lub_divisor_shift = 3; lub_index = 0; lub = board->clock[lub_index] * (1 << lub_divisor_shift); @@ -278,19 +268,19 @@ static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, glb_index = board->num_clocks - 1; glb = board->clock[glb_index] * (1 << glb_divisor_shift); - /* make sure period is in available range */ + /* make sure period is in available range */ if (*period < glb) *period = glb; if (*period > lub) *period = lub; - /* we can multiply period by 1, 2, 4, or 8, using (1 << i) */ + /* we can multiply period by 1, 2, 4, or 8, using (1 << i) */ for (i = 0; i < 4; i++) { - /* there are a maximum of 4 master clocks */ + /* there are a maximum of 4 master clocks */ for (j = 0; j < board->num_clocks; j++) { - /* temp is the period in nanosec we are evaluating */ + /* temp is the period in nanosec we are evaluating */ temp = board->clock[j] * (1 << i); - /* if it is the best match yet */ + /* if it is the best match yet */ if (temp < lub && temp >= *period) { lub_divisor_shift = i; lub_index = j; @@ -306,7 +296,7 @@ static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, switch (flags & CMDF_ROUND_MASK) { case CMDF_ROUND_NEAREST: default: - /* if least upper bound is better approximation */ + /* if least upper bound is better approximation */ if (lub - *period < *period - glb) *period = lub; else @@ -320,7 +310,7 @@ static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, break; } - /* set clock bits for config register appropriately */ + /* set clock bits for config register appropriately */ devpriv->config_bits &= ~CLOCK_MASK; if (*period == lub) { devpriv->config_bits |= @@ -495,7 +485,7 @@ static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) "dma incompatible with hard real-time interrupt (CMDF_PRIORITY), aborting\n"); return -1; } - /* clear fifo and reset triggering circuitry */ + /* clear fifo and reset triggering circuitry */ outw(0, dev->iobase + FIFO_RESET_REG); /* setup chanlist */ @@ -503,7 +493,7 @@ static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) cmd->chanlist_len) < 0) return -1; - /* setup ac/dc coupling */ + /* setup ac/dc coupling */ if (CR_AREF(cmd->chanlist[0]) == AREF_OTHER) devpriv->config_bits |= AC0_BIT; else @@ -513,18 +503,18 @@ static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) else devpriv->config_bits &= ~AC1_BIT; - /* setup timing */ + /* setup timing */ a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags); - /* send timing, channel, config bits */ + /* send timing, channel, config bits */ outw(devpriv->config_bits, dev->iobase + CONFIG_REG); - /* initialize number of samples remaining */ + /* initialize number of samples remaining */ devpriv->count = cmd->stop_arg * cmd->chanlist_len; comedi_isadma_disable(desc->chan); - /* set size of transfer to fill in 1/3 second */ + /* set size of transfer to fill in 1/3 second */ #define ONE_THIRD_SECOND 333333333 desc->size = comedi_bytes_per_sample(s) * cmd->chanlist_len * ONE_THIRD_SECOND / cmd->scan_begin_arg; @@ -536,40 +526,45 @@ static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) comedi_isadma_program(desc); - /* clear dma interrupt before enabling it, to try and get rid of that - * one spurious interrupt that has been happening */ + /* + * Clear dma interrupt before enabling it, to try and get rid of + * that one spurious interrupt that has been happening. + */ outw(0x00, dev->iobase + DMA_TC_CLEAR_REG); - /* enable dma on card */ + /* enable dma on card */ devpriv->irq_dma_bits |= DMA_INTR_EN_BIT | DMA_EN_BIT; outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); - /* may need to wait 72 sampling periods if timing was changed */ + /* may need to wait 72 sampling periods if timing was changed */ comedi_8254_load(dev->pacer, 2, 72, I8254_MODE0 | I8254_BINARY); - /* setup start triggering */ + /* setup start triggering */ trigger_bits = 0; - /* decide if we need to wait 72 periods for valid data */ + /* decide if we need to wait 72 periods for valid data */ if (cmd->start_src == TRIG_NOW && (old_config_bits & CLOCK_MASK) != (devpriv->config_bits & CLOCK_MASK)) { - /* set trigger source to delay trigger */ + /* set trigger source to delay trigger */ trigger_bits |= DELAY_TRIGGER_BITS; } else { - /* otherwise no delay */ + /* otherwise no delay */ trigger_bits |= POST_TRIGGER_BITS; } - /* enable external hardware trigger */ + /* enable external hardware trigger */ if (cmd->start_src == TRIG_EXT) { trigger_bits |= HW_TRIG_EN; } else if (cmd->start_src == TRIG_OTHER) { - /* XXX add support for level/slope start trigger using TRIG_OTHER */ + /* + * XXX add support for level/slope start trigger + * using TRIG_OTHER + */ dev_err(dev->class_dev, "you shouldn't see this?\n"); } - /* send trigger config bits */ + /* send trigger config bits */ outw(trigger_bits, dev->iobase + TRIGGER_REG); - /* start acquisition for soft trigger */ + /* start acquisition for soft trigger */ if (cmd->start_src == TRIG_NOW) outw(0, dev->iobase + FIFO_START_REG); @@ -596,28 +591,28 @@ static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, unsigned int n; int ret; - /* clear fifo and reset triggering circuitry */ + /* clear fifo and reset triggering circuitry */ outw(0, dev->iobase + FIFO_RESET_REG); /* setup chanlist */ if (a2150_set_chanlist(dev, CR_CHAN(insn->chanspec), 1) < 0) return -1; - /* set dc coupling */ + /* set dc coupling */ devpriv->config_bits &= ~AC0_BIT; devpriv->config_bits &= ~AC1_BIT; - /* send timing, channel, config bits */ + /* send timing, channel, config bits */ outw(devpriv->config_bits, dev->iobase + CONFIG_REG); - /* disable dma on card */ + /* disable dma on card */ devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); - /* setup start triggering */ + /* setup start triggering */ outw(0, dev->iobase + TRIGGER_REG); - /* start acquisition for soft trigger */ + /* start acquisition for soft trigger */ outw(0, dev->iobase + FIFO_START_REG); /* @@ -632,7 +627,7 @@ static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, inw(dev->iobase + FIFO_DATA_REG); } - /* read data */ + /* read data */ for (n = 0; n < insn->n; n++) { ret = comedi_timeout(dev, s, insn, a2150_ai_eoc, 0); if (ret) @@ -642,7 +637,7 @@ static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, data[n] ^= 0x8000; } - /* clear fifo and reset triggering circuitry */ + /* clear fifo and reset triggering circuitry */ outw(0, dev->iobase + FIFO_RESET_REG); return n; @@ -749,16 +744,16 @@ static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it) s->cancel = a2150_cancel; } - /* set card's irq and dma levels */ + /* set card's irq and dma levels */ outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); - /* reset and sync adc clock circuitry */ + /* reset and sync adc clock circuitry */ outw_p(DPD_BIT | APD_BIT, dev->iobase + CONFIG_REG); outw_p(DPD_BIT, dev->iobase + CONFIG_REG); - /* initialize configuration register */ + /* initialize configuration register */ devpriv->config_bits = 0; outw(devpriv->config_bits, dev->iobase + CONFIG_REG); - /* wait until offset calibration is done, then enable analog inputs */ + /* wait until offset calibration is done, then enable analog inputs */ for (i = 0; i < timeout; i++) { if ((DCAL_BIT & inw(dev->iobase + STATUS_REG)) == 0) break; |