Move `abort_dma()`, `disable_ai_pacing()`, `i2c_high_udelay`,
`i2c_low_udelay`, `i2c_set_sda()`, `i2c_set_scl()`, `i2c_write_byte()`,
`i2c_read_ack()`, `i2c_start()`, `i2c_stop()`, `i2c_write()`,
`get_divisor()`, `check_adc_timing()`, `disable_ai_pacing()`,
`abort_dma()`, `get_ao_divisor()`, `ao_inttrig()`,
`caldac_8800_write()`, `caldac_i2c_write()`, `check_adc_timing()`,
`get_divisor()`, and `get_ao_divisor()`, and remove their forward
declarations.
Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx>
---
drivers/staging/comedi/drivers/cb_pcidas64.c | 768 +++++++++++++--------------
1 file changed, 377 insertions(+), 391 deletions(-)
diff --git a/drivers/staging/comedi/drivers/cb_pcidas64.c b/drivers/staging/comedi/drivers/cb_pcidas64.c
index a88e879..f767cdb 100644
--- a/drivers/staging/comedi/drivers/cb_pcidas64.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas64.c
@@ -1151,27 +1151,13 @@ struct pcidas64_private {
short ao_bounce_buffer[DAC_FIFO_SIZE];
};
-static int ao_inttrig(struct comedi_device *dev,
- struct comedi_subdevice *subdev, unsigned int trig_num);
-static irqreturn_t handle_interrupt(int irq, void *d);
-static void check_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd);
-static unsigned int get_divisor(unsigned int ns, unsigned int flags);
-static void i2c_write(struct comedi_device *dev, unsigned int address,
- const uint8_t *data, unsigned int length);
-static int caldac_8800_write(struct comedi_device *dev, unsigned int address,
- uint8_t value);
-static int caldac_i2c_write(struct comedi_device *dev,
- unsigned int caldac_channel, unsigned int value);
-static void abort_dma(struct comedi_device *dev, unsigned int channel);
static void disable_plx_interrupts(struct comedi_device *dev);
static int set_ai_fifo_size(struct comedi_device *dev,
unsigned int num_samples);
static unsigned int ai_fifo_size(struct comedi_device *dev);
static int set_ai_fifo_segment_length(struct comedi_device *dev,
unsigned int num_entries);
-static void disable_ai_pacing(struct comedi_device *dev);
static void disable_ai_interrupts(struct comedi_device *dev);
-static unsigned int get_ao_divisor(unsigned int ns, unsigned int flags);
static void load_ao_dma(struct comedi_device *dev,
const struct comedi_cmd *cmd);
@@ -1252,6 +1238,19 @@ static inline int ao_cmd_is_supported(const struct pcidas64_board *board)
return board->ao_nchan && board->layout != LAYOUT_4020;
}
+static void abort_dma(struct comedi_device *dev, unsigned int channel)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ unsigned long flags;
+
+ /* spinlock for plx dma control/status reg */
+ spin_lock_irqsave(&dev->spinlock, flags);
+
+ plx9080_abort_dma(devpriv->plx9080_iobase, channel);
+
+ spin_unlock_irqrestore(&dev->spinlock, flags);
+}
+
/* initialize plx9080 chip */
static void init_plx9080(struct comedi_device *dev)
{
@@ -1353,6 +1352,24 @@ static void disable_plx_interrupts(struct comedi_device *dev)
devpriv->plx9080_iobase + PLX_INTRCS_REG);
}
+static void disable_ai_pacing(struct comedi_device *dev)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ unsigned long flags;
+
+ disable_ai_interrupts(dev);
+
+ spin_lock_irqsave(&dev->spinlock, flags);
+ devpriv->adc_control1_bits &= ~ADC_SW_GATE_BIT;
+ writew(devpriv->adc_control1_bits,
+ devpriv->main_iobase + ADC_CONTROL1_REG);
+ spin_unlock_irqrestore(&dev->spinlock, flags);
+
+ /* disable pacing, triggering, etc */
+ writew(ADC_DMA_DISABLE_BIT | ADC_SOFT_GATE_BITS | ADC_GATE_LEVEL_BIT,
+ devpriv->main_iobase + ADC_CONTROL0_REG);
+}
+
static void init_stc_registers(struct comedi_device *dev)
{
const struct pcidas64_board *thisboard = comedi_board(dev);
@@ -1495,6 +1512,135 @@ static inline void warn_external_queue(struct comedi_device *dev)
"Use internal AI channel queue (channels must be consecutive and use same range/aref)");
}
+/* Their i2c requires a huge delay on setting clock or data high for some reason */
+static const int i2c_high_udelay = 1000;
+static const int i2c_low_udelay = 10;
+
+/* set i2c data line high or low */
+static void i2c_set_sda(struct comedi_device *dev, int state)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ static const int data_bit = CTL_EE_W;
+ void __iomem *plx_control_addr = devpriv->plx9080_iobase +
+ PLX_CONTROL_REG;
+
+ if (state) {
+ /* set data line high */
+ devpriv->plx_control_bits &= ~data_bit;
+ writel(devpriv->plx_control_bits, plx_control_addr);
+ udelay(i2c_high_udelay);
+ } else { /* set data line low */
+
+ devpriv->plx_control_bits |= data_bit;
+ writel(devpriv->plx_control_bits, plx_control_addr);
+ udelay(i2c_low_udelay);
+ }
+}
+
+/* set i2c clock line high or low */
+static void i2c_set_scl(struct comedi_device *dev, int state)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ static const int clock_bit = CTL_USERO;
+ void __iomem *plx_control_addr = devpriv->plx9080_iobase +
+ PLX_CONTROL_REG;
+
+ if (state) {
+ /* set clock line high */
+ devpriv->plx_control_bits &= ~clock_bit;
+ writel(devpriv->plx_control_bits, plx_control_addr);
+ udelay(i2c_high_udelay);
+ } else { /* set clock line low */
+
+ devpriv->plx_control_bits |= clock_bit;
+ writel(devpriv->plx_control_bits, plx_control_addr);
+ udelay(i2c_low_udelay);
+ }
+}
+
+static void i2c_write_byte(struct comedi_device *dev, uint8_t byte)
+{
+ uint8_t bit;
+ unsigned int num_bits = 8;
+
+ DEBUG_PRINT("writing to i2c byte 0x%x\n", byte);
+
+ for (bit = 1 << (num_bits - 1); bit; bit >>= 1) {
+ i2c_set_scl(dev, 0);
+ if ((byte & bit))
+ i2c_set_sda(dev, 1);
+ else
+ i2c_set_sda(dev, 0);
+ i2c_set_scl(dev, 1);
+ }
+}
+
+/* we can't really read the lines, so fake it */
+static int i2c_read_ack(struct comedi_device *dev)
+{
+ i2c_set_scl(dev, 0);
+ i2c_set_sda(dev, 1);
+ i2c_set_scl(dev, 1);
+
+ return 0; /* return fake acknowledge bit */
+}
+
+/* send start bit */
+static void i2c_start(struct comedi_device *dev)
+{
+ i2c_set_scl(dev, 1);
+ i2c_set_sda(dev, 1);
+ i2c_set_sda(dev, 0);
+}
+
+/* send stop bit */
+static void i2c_stop(struct comedi_device *dev)
+{
+ i2c_set_scl(dev, 0);
+ i2c_set_sda(dev, 0);
+ i2c_set_scl(dev, 1);
+ i2c_set_sda(dev, 1);
+}
+
+static void i2c_write(struct comedi_device *dev, unsigned int address,
+ const uint8_t *data, unsigned int length)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ unsigned int i;
+ uint8_t bitstream;
+ static const int read_bit = 0x1;
+
+ /* XXX need mutex to prevent simultaneous attempts to access
+ * eeprom and i2c bus */
+
+ /* make sure we dont send anything to eeprom */
+ devpriv->plx_control_bits &= ~CTL_EE_CS;
+
+ i2c_stop(dev);
+ i2c_start(dev);
+
+ /* send address and write bit */
+ bitstream = (address << 1) & ~read_bit;
+ i2c_write_byte(dev, bitstream);
+
+ /* get acknowledge */
+ if (i2c_read_ack(dev) != 0) {
+ comedi_error(dev, "i2c write failed: no acknowledge");
+ i2c_stop(dev);
+ return;
+ }
+ /* write data bytes */
+ for (i = 0; i < length; i++) {
+ i2c_write_byte(dev, data[i]);
+ if (i2c_read_ack(dev) != 0) {
+ comedi_error(dev, "i2c write failed: no acknowledge");
+ i2c_stop(dev);
+ return;
+ }
+ }
+ i2c_stop(dev);
+}
+
static int ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
@@ -1750,6 +1896,80 @@ static int ai_config_insn(struct comedi_device *dev, struct comedi_subdevice *s,
return -EINVAL;
}
+/* Gets nearest achievable timing given master clock speed, does not
+ * take into account possible minimum/maximum divisor values. Used
+ * by other timing checking functions. */
+static unsigned int get_divisor(unsigned int ns, unsigned int flags)
+{
+ unsigned int divisor;
+
+ switch (flags & TRIG_ROUND_MASK) {
+ case TRIG_ROUND_UP:
+ divisor = (ns + TIMER_BASE - 1) / TIMER_BASE;
+ break;
+ case TRIG_ROUND_DOWN:
+ divisor = ns / TIMER_BASE;
+ break;
+ case TRIG_ROUND_NEAREST:
+ default:
+ divisor = (ns + TIMER_BASE / 2) / TIMER_BASE;
+ break;
+ }
+ return divisor;
+}
+
+/* utility function that rounds desired timing to an achievable time, and
+ * sets cmd members appropriately.
+ * adc paces conversions from master clock by dividing by (x + 3) where x is 24 bit number
+ */
+static void check_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd)
+{
+ const struct pcidas64_board *thisboard = comedi_board(dev);
+ unsigned int convert_divisor = 0, scan_divisor;
+ static const int min_convert_divisor = 3;
+ static const int max_convert_divisor =
+ max_counter_value + min_convert_divisor;
+ static const int min_scan_divisor_4020 = 2;
+ unsigned long long max_scan_divisor, min_scan_divisor;
+
+ if (cmd->convert_src == TRIG_TIMER) {
+ if (thisboard->layout == LAYOUT_4020) {
+ cmd->convert_arg = 0;
+ } else {
+ convert_divisor = get_divisor(cmd->convert_arg,
+ cmd->flags);
+ if (convert_divisor > max_convert_divisor)
+ convert_divisor = max_convert_divisor;
+ if (convert_divisor < min_convert_divisor)
+ convert_divisor = min_convert_divisor;
+ cmd->convert_arg = convert_divisor * TIMER_BASE;
+ }
+ } else if (cmd->convert_src == TRIG_NOW) {
+ cmd->convert_arg = 0;
+ }
+
+ if (cmd->scan_begin_src == TRIG_TIMER) {
+ scan_divisor = get_divisor(cmd->scan_begin_arg, cmd->flags);
+ if (cmd->convert_src == TRIG_TIMER) {
+ /* XXX check for integer overflows */
+ min_scan_divisor = convert_divisor * cmd->chanlist_len;
+ max_scan_divisor =
+ (convert_divisor * cmd->chanlist_len - 1) +
+ max_counter_value;
+ } else {
+ min_scan_divisor = min_scan_divisor_4020;
+ max_scan_divisor = max_counter_value + min_scan_divisor;
+ }
+ if (scan_divisor > max_scan_divisor)
+ scan_divisor = max_scan_divisor;
+ if (scan_divisor < min_scan_divisor)
+ scan_divisor = min_scan_divisor;
+ cmd->scan_begin_arg = scan_divisor * TIMER_BASE;
+ }
+
+ return;
+}
+
static int ai_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
@@ -1957,24 +2177,6 @@ static inline unsigned int dma_transfer_size(struct comedi_device *dev)
return num_samples;
}
-static void disable_ai_pacing(struct comedi_device *dev)
-{
- struct pcidas64_private *devpriv = dev->private;
- unsigned long flags;
-
- disable_ai_interrupts(dev);
-
- spin_lock_irqsave(&dev->spinlock, flags);
- devpriv->adc_control1_bits &= ~ADC_SW_GATE_BIT;
- writew(devpriv->adc_control1_bits,
- devpriv->main_iobase + ADC_CONTROL1_REG);
- spin_unlock_irqrestore(&dev->spinlock, flags);
-
- /* disable pacing, triggering, etc */
- writew(ADC_DMA_DISABLE_BIT | ADC_SOFT_GATE_BITS | ADC_GATE_LEVEL_BIT,
- devpriv->main_iobase + ADC_CONTROL0_REG);
-}
-
static void disable_ai_interrupts(struct comedi_device *dev)
{
struct pcidas64_private *devpriv = dev->private;
@@ -2817,19 +3019,6 @@ static irqreturn_t handle_interrupt(int irq, void *d)
return IRQ_HANDLED;
}
-static void abort_dma(struct comedi_device *dev, unsigned int channel)
-{
- struct pcidas64_private *devpriv = dev->private;
- unsigned long flags;
-
- /* spinlock for plx dma control/status reg */
- spin_lock_irqsave(&dev->spinlock, flags);
-
- plx9080_abort_dma(devpriv->plx9080_iobase, channel);
-
- spin_unlock_irqrestore(&dev->spinlock, flags);
-}
-
static int ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct pcidas64_private *devpriv = dev->private;
@@ -2952,6 +3141,11 @@ static void set_dac_select_reg(struct comedi_device *dev,
writew(bits, devpriv->main_iobase + DAC_SELECT_REG);
}
+static unsigned int get_ao_divisor(unsigned int ns, unsigned int flags)
+{
+ return get_divisor(ns, flags) - 2;
+}
+
static void set_dac_interval_regs(struct comedi_device *dev,
const struct comedi_cmd *cmd)
{
@@ -3092,6 +3286,30 @@ static inline int external_ai_queue_in_use(struct comedi_device *dev)
return 1;
}
+static int ao_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
+ unsigned int trig_num)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ struct comedi_cmd *cmd = &s->async->cmd;
+ int retval;
+
+ if (trig_num != 0)
+ return -EINVAL;
+
+ retval = prep_ao_dma(dev, cmd);
+ if (retval < 0)
+ return -EPIPE;
+
+ set_dac_control0_reg(dev, cmd);
+
+ if (cmd->start_src == TRIG_INT)
+ writew(0, devpriv->main_iobase + DAC_START_REG);
+
+ s->async->inttrig = NULL;
+
+ return 0;
+}
+
static int ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
{
struct pcidas64_private *devpriv = dev->private;
@@ -3118,30 +3336,6 @@ static int ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
return 0;
}
-static int ao_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
- unsigned int trig_num)
-{
- struct pcidas64_private *devpriv = dev->private;
- struct comedi_cmd *cmd = &s->async->cmd;
- int retval;
-
- if (trig_num != 0)
- return -EINVAL;
-
- retval = prep_ao_dma(dev, cmd);
- if (retval < 0)
- return -EPIPE;
-
- set_dac_control0_reg(dev, cmd);
-
- if (cmd->start_src == TRIG_INT)
- writew(0, devpriv->main_iobase + DAC_START_REG);
-
- s->async->inttrig = NULL;
-
- return 0;
-}
-
static int ao_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
struct comedi_cmd *cmd)
{
@@ -3346,6 +3540,120 @@ static int dio_60xx_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
return insn->n;
}
+/* pci-6025 8800 caldac:
+ * address 0 == dac channel 0 offset
+ * address 1 == dac channel 0 gain
+ * address 2 == dac channel 1 offset
+ * address 3 == dac channel 1 gain
+ * address 4 == fine adc offset
+ * address 5 == coarse adc offset
+ * address 6 == coarse adc gain
+ * address 7 == fine adc gain
+ */
+/* pci-6402/16 uses all 8 channels for dac:
+ * address 0 == dac channel 0 fine gain
+ * address 1 == dac channel 0 coarse gain
+ * address 2 == dac channel 0 coarse offset
+ * address 3 == dac channel 1 coarse offset
+ * address 4 == dac channel 1 fine gain
+ * address 5 == dac channel 1 coarse gain
+ * address 6 == dac channel 0 fine offset
+ * address 7 == dac channel 1 fine offset
+*/
+
+static int caldac_8800_write(struct comedi_device *dev, unsigned int address,
+ uint8_t value)
+{
+ struct pcidas64_private *devpriv = dev->private;
+ static const int num_caldac_channels = 8;
+ static const int bitstream_length = 11;
+ unsigned int bitstream = ((address & 0x7) << 8) | value;
+ unsigned int bit, register_bits;
+ static const int caldac_8800_udelay = 1;
+
+ if (address >= num_caldac_channels) {
+ comedi_error(dev, "illegal caldac channel");
+ return -1;
+ }
+ for (bit = 1 << (bitstream_length - 1); bit; bit >>= 1) {
+ register_bits = 0;
+ if (bitstream & bit)
+ register_bits |= SERIAL_DATA_IN_BIT;
+ udelay(caldac_8800_udelay);
+ writew(register_bits, devpriv->main_iobase + CALIBRATION_REG);
+ register_bits |= SERIAL_CLOCK_BIT;
+ udelay(caldac_8800_udelay);
+ writew(register_bits, devpriv->main_iobase + CALIBRATION_REG);
+ }
+ udelay(caldac_8800_udelay);
+ writew(SELECT_8800_BIT, devpriv->main_iobase + CALIBRATION_REG);
+ udelay(caldac_8800_udelay);
+ writew(0, devpriv->main_iobase + CALIBRATION_REG);
+ udelay(caldac_8800_udelay);
+ return 0;
+}
+
+/* 4020 caldacs */
+static int caldac_i2c_write(struct comedi_device *dev,
+ unsigned int caldac_channel, unsigned int value)
+{
+ uint8_t serial_bytes[3];
+ uint8_t i2c_addr;
+ enum pointer_bits {
+ /* manual has gain and offset bits switched */
+ OFFSET_0_2 = 0x1,
+ GAIN_0_2 = 0x2,
+ OFFSET_1_3 = 0x4,
+ GAIN_1_3 = 0x8,
+ };
+ enum data_bits {
+ NOT_CLEAR_REGISTERS = 0x20,
+ };
+
+ switch (caldac_channel) {
+ case 0: /* chan 0 offset */
+ i2c_addr = CALDAC0_I2C_ADDR;
+ serial_bytes[0] = OFFSET_0_2;
+ break;
+ case 1: /* chan 1 offset */
+ i2c_addr = CALDAC0_I2C_ADDR;
+ serial_bytes[0] = OFFSET_1_3;
+ break;
+ case 2: /* chan 2 offset */
+ i2c_addr = CALDAC1_I2C_ADDR;
+ serial_bytes[0] = OFFSET_0_2;
+ break;
+ case 3: /* chan 3 offset */
+ i2c_addr = CALDAC1_I2C_ADDR;
+ serial_bytes[0] = OFFSET_1_3;
+ break;
+ case 4: /* chan 0 gain */
+ i2c_addr = CALDAC0_I2C_ADDR;
+ serial_bytes[0] = GAIN_0_2;
+ break;
+ case 5: /* chan 1 gain */
+ i2c_addr = CALDAC0_I2C_ADDR;
+ serial_bytes[0] = GAIN_1_3;
+ break;
+ case 6: /* chan 2 gain */
+ i2c_addr = CALDAC1_I2C_ADDR;
+ serial_bytes[0] = GAIN_0_2;
+ break;
+ case 7: /* chan 3 gain */
+ i2c_addr = CALDAC1_I2C_ADDR;
+ serial_bytes[0] = GAIN_1_3;
+ break;
+ default:
+ comedi_error(dev, "invalid caldac channel\n");
+ return -1;
+ break;
+ }
+ serial_bytes[1] = NOT_CLEAR_REGISTERS | ((value >> 8) & 0xf);
+ serial_bytes[2] = value & 0xff;
+ i2c_write(dev, i2c_addr, serial_bytes, 3);
+ return 0;
+}
+
static void caldac_write(struct comedi_device *dev, unsigned int channel,
unsigned int value)
{
@@ -3531,85 +3839,6 @@ static int eeprom_read_insn(struct comedi_device *dev,
return 1;
}
-/* utility function that rounds desired timing to an achievable time, and
- * sets cmd members appropriately.
- * adc paces conversions from master clock by dividing by (x + 3) where x is 24 bit number
- */
-static void check_adc_timing(struct comedi_device *dev, struct comedi_cmd *cmd)
-{
- const struct pcidas64_board *thisboard = comedi_board(dev);
- unsigned int convert_divisor = 0, scan_divisor;
- static const int min_convert_divisor = 3;
- static const int max_convert_divisor =
- max_counter_value + min_convert_divisor;
- static const int min_scan_divisor_4020 = 2;
- unsigned long long max_scan_divisor, min_scan_divisor;
-
- if (cmd->convert_src == TRIG_TIMER) {
- if (thisboard->layout == LAYOUT_4020) {
- cmd->convert_arg = 0;
- } else {
- convert_divisor = get_divisor(cmd->convert_arg,
- cmd->flags);
- if (convert_divisor > max_convert_divisor)
- convert_divisor = max_convert_divisor;
- if (convert_divisor < min_convert_divisor)
- convert_divisor = min_convert_divisor;
- cmd->convert_arg = convert_divisor * TIMER_BASE;
- }
- } else if (cmd->convert_src == TRIG_NOW) {
- cmd->convert_arg = 0;
- }
-
- if (cmd->scan_begin_src == TRIG_TIMER) {
- scan_divisor = get_divisor(cmd->scan_begin_arg, cmd->flags);
- if (cmd->convert_src == TRIG_TIMER) {
- /* XXX check for integer overflows */
- min_scan_divisor = convert_divisor * cmd->chanlist_len;
- max_scan_divisor =
- (convert_divisor * cmd->chanlist_len - 1) +
- max_counter_value;
- } else {
- min_scan_divisor = min_scan_divisor_4020;
- max_scan_divisor = max_counter_value + min_scan_divisor;
- }
- if (scan_divisor > max_scan_divisor)
- scan_divisor = max_scan_divisor;
- if (scan_divisor < min_scan_divisor)
- scan_divisor = min_scan_divisor;
- cmd->scan_begin_arg = scan_divisor * TIMER_BASE;
- }
-
- return;
-}
-
-/* Gets nearest achievable timing given master clock speed, does not
- * take into account possible minimum/maximum divisor values. Used
- * by other timing checking functions. */
-static unsigned int get_divisor(unsigned int ns, unsigned int flags)
-{
- unsigned int divisor;
-
- switch (flags & TRIG_ROUND_MASK) {
- case TRIG_ROUND_UP:
- divisor = (ns + TIMER_BASE - 1) / TIMER_BASE;
- break;
- case TRIG_ROUND_DOWN:
- divisor = ns / TIMER_BASE;
- break;
- case TRIG_ROUND_NEAREST:
- default:
- divisor = (ns + TIMER_BASE / 2) / TIMER_BASE;
- break;
- }
- return divisor;
-}
-
-static unsigned int get_ao_divisor(unsigned int ns, unsigned int flags)
-{
- return get_divisor(ns, flags) - 2;
-}
-
/* adjusts the size of hardware fifo (which determines block size for dma xfers) */
static int set_ai_fifo_size(struct comedi_device *dev, unsigned int num_samples)
{
@@ -3676,249 +3905,6 @@ static int set_ai_fifo_segment_length(struct comedi_device *dev,
return devpriv->ai_fifo_segment_length;
}
-/* pci-6025 8800 caldac:
- * address 0 == dac channel 0 offset
- * address 1 == dac channel 0 gain
- * address 2 == dac channel 1 offset
- * address 3 == dac channel 1 gain
- * address 4 == fine adc offset
- * address 5 == coarse adc offset
- * address 6 == coarse adc gain
- * address 7 == fine adc gain
- */
-/* pci-6402/16 uses all 8 channels for dac:
- * address 0 == dac channel 0 fine gain
- * address 1 == dac channel 0 coarse gain
- * address 2 == dac channel 0 coarse offset
- * address 3 == dac channel 1 coarse offset
- * address 4 == dac channel 1 fine gain
- * address 5 == dac channel 1 coarse gain
- * address 6 == dac channel 0 fine offset
- * address 7 == dac channel 1 fine offset
-*/
-
-static int caldac_8800_write(struct comedi_device *dev, unsigned int address,
- uint8_t value)
-{
- struct pcidas64_private *devpriv = dev->private;
- static const int num_caldac_channels = 8;
- static const int bitstream_length = 11;
- unsigned int bitstream = ((address & 0x7) << 8) | value;
- unsigned int bit, register_bits;
- static const int caldac_8800_udelay = 1;
-
- if (address >= num_caldac_channels) {
- comedi_error(dev, "illegal caldac channel");
- return -1;
- }
- for (bit = 1 << (bitstream_length - 1); bit; bit >>= 1) {
- register_bits = 0;
- if (bitstream & bit)
- register_bits |= SERIAL_DATA_IN_BIT;
- udelay(caldac_8800_udelay);
- writew(register_bits, devpriv->main_iobase + CALIBRATION_REG);
- register_bits |= SERIAL_CLOCK_BIT;
- udelay(caldac_8800_udelay);
- writew(register_bits, devpriv->main_iobase + CALIBRATION_REG);
- }
- udelay(caldac_8800_udelay);
- writew(SELECT_8800_BIT, devpriv->main_iobase + CALIBRATION_REG);
- udelay(caldac_8800_udelay);
- writew(0, devpriv->main_iobase + CALIBRATION_REG);
- udelay(caldac_8800_udelay);
- return 0;
-}
-
-/* 4020 caldacs */
-static int caldac_i2c_write(struct comedi_device *dev,
- unsigned int caldac_channel, unsigned int value)
-{
- uint8_t serial_bytes[3];
- uint8_t i2c_addr;
- enum pointer_bits {
- /* manual has gain and offset bits switched */
- OFFSET_0_2 = 0x1,
- GAIN_0_2 = 0x2,
- OFFSET_1_3 = 0x4,
- GAIN_1_3 = 0x8,
- };
- enum data_bits {
- NOT_CLEAR_REGISTERS = 0x20,
- };
-
- switch (caldac_channel) {
- case 0: /* chan 0 offset */
- i2c_addr = CALDAC0_I2C_ADDR;
- serial_bytes[0] = OFFSET_0_2;
- break;
- case 1: /* chan 1 offset */
- i2c_addr = CALDAC0_I2C_ADDR;
- serial_bytes[0] = OFFSET_1_3;
- break;
- case 2: /* chan 2 offset */
- i2c_addr = CALDAC1_I2C_ADDR;
- serial_bytes[0] = OFFSET_0_2;
- break;
- case 3: /* chan 3 offset */
- i2c_addr = CALDAC1_I2C_ADDR;
- serial_bytes[0] = OFFSET_1_3;
- break;
- case 4: /* chan 0 gain */
- i2c_addr = CALDAC0_I2C_ADDR;
- serial_bytes[0] = GAIN_0_2;
- break;
- case 5: /* chan 1 gain */
- i2c_addr = CALDAC0_I2C_ADDR;
- serial_bytes[0] = GAIN_1_3;
- break;
- case 6: /* chan 2 gain */
- i2c_addr = CALDAC1_I2C_ADDR;
- serial_bytes[0] = GAIN_0_2;
- break;
- case 7: /* chan 3 gain */
- i2c_addr = CALDAC1_I2C_ADDR;
- serial_bytes[0] = GAIN_1_3;
- break;
- default:
- comedi_error(dev, "invalid caldac channel\n");
- return -1;
- break;
- }
- serial_bytes[1] = NOT_CLEAR_REGISTERS | ((value >> 8) & 0xf);
- serial_bytes[2] = value & 0xff;
- i2c_write(dev, i2c_addr, serial_bytes, 3);
- return 0;
-}
-
-/* Their i2c requires a huge delay on setting clock or data high for some reason */
-static const int i2c_high_udelay = 1000;
-static const int i2c_low_udelay = 10;
-
-/* set i2c data line high or low */
-static void i2c_set_sda(struct comedi_device *dev, int state)
-{
- struct pcidas64_private *devpriv = dev->private;
- static const int data_bit = CTL_EE_W;
- void __iomem *plx_control_addr = devpriv->plx9080_iobase +
- PLX_CONTROL_REG;
-
- if (state) {
- /* set data line high */
- devpriv->plx_control_bits &= ~data_bit;
- writel(devpriv->plx_control_bits, plx_control_addr);
- udelay(i2c_high_udelay);
- } else { /* set data line low */
-
- devpriv->plx_control_bits |= data_bit;
- writel(devpriv->plx_control_bits, plx_control_addr);
- udelay(i2c_low_udelay);
- }
-}
-
-/* set i2c clock line high or low */
-static void i2c_set_scl(struct comedi_device *dev, int state)
-{
- struct pcidas64_private *devpriv = dev->private;
- static const int clock_bit = CTL_USERO;
- void __iomem *plx_control_addr = devpriv->plx9080_iobase +
- PLX_CONTROL_REG;
-
- if (state) {
- /* set clock line high */
- devpriv->plx_control_bits &= ~clock_bit;
- writel(devpriv->plx_control_bits, plx_control_addr);
- udelay(i2c_high_udelay);
- } else { /* set clock line low */
-
- devpriv->plx_control_bits |= clock_bit;
- writel(devpriv->plx_control_bits, plx_control_addr);
- udelay(i2c_low_udelay);
- }
-}
-
-static void i2c_write_byte(struct comedi_device *dev, uint8_t byte)
-{
- uint8_t bit;
- unsigned int num_bits = 8;
-
- DEBUG_PRINT("writing to i2c byte 0x%x\n", byte);
-
- for (bit = 1 << (num_bits - 1); bit; bit >>= 1) {
- i2c_set_scl(dev, 0);
- if ((byte & bit))
- i2c_set_sda(dev, 1);
- else
- i2c_set_sda(dev, 0);
- i2c_set_scl(dev, 1);
- }
-}
-
-/* we can't really read the lines, so fake it */
-static int i2c_read_ack(struct comedi_device *dev)
-{
- i2c_set_scl(dev, 0);
- i2c_set_sda(dev, 1);
- i2c_set_scl(dev, 1);
-
- return 0; /* return fake acknowledge bit */
-}
-
-/* send start bit */
-static void i2c_start(struct comedi_device *dev)
-{
- i2c_set_scl(dev, 1);
- i2c_set_sda(dev, 1);
- i2c_set_sda(dev, 0);
-}
-
-/* send stop bit */
-static void i2c_stop(struct comedi_device *dev)
-{
- i2c_set_scl(dev, 0);
- i2c_set_sda(dev, 0);
- i2c_set_scl(dev, 1);
- i2c_set_sda(dev, 1);
-}
-
-static void i2c_write(struct comedi_device *dev, unsigned int address,
- const uint8_t *data, unsigned int length)
-{
- struct pcidas64_private *devpriv = dev->private;
- unsigned int i;
- uint8_t bitstream;
- static const int read_bit = 0x1;
-
- /* XXX need mutex to prevent simultaneous attempts to access
- * eeprom and i2c bus */
-
- /* make sure we dont send anything to eeprom */
- devpriv->plx_control_bits &= ~CTL_EE_CS;
-
- i2c_stop(dev);
- i2c_start(dev);
-
- /* send address and write bit */
- bitstream = (address << 1) & ~read_bit;
- i2c_write_byte(dev, bitstream);
-
- /* get acknowledge */
- if (i2c_read_ack(dev) != 0) {
- comedi_error(dev, "i2c write failed: no acknowledge");
- i2c_stop(dev);
- return;
- }
- /* write data bytes */
- for (i = 0; i < length; i++) {
- i2c_write_byte(dev, data[i]);
- if (i2c_read_ack(dev) != 0) {
- comedi_error(dev, "i2c write failed: no acknowledge");
- i2c_stop(dev);
- return;
- }
- }
- i2c_stop(dev);
-}
-
/* Allocate and initialize the subdevice structures.
*/
static int setup_subdevices(struct comedi_device *dev)
--
1.7.12.4
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