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staging: comedi: s626: replace S626_MULT_X? values 

Replace the use of the `S626_MULT_X1`, `S626_MULT_X2` and `S626_MULT_X4`
clock multiplier values with the equivalent `S626_CLKMULT_1X`,
`S626_CLKMULT_2X` and `S626_CLKMULT_4X` values to avoid duplication.
Replace the use of `S626_MULT_X0` with a new macro
`S626_CLKMULT_SPECIAL` (this is treated specially by the
'ClkMultA'/'ClkMultB' field of the 'CRA'/'CRB' register).  Remove the
now unused `S626_MULT_X?` macros.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-10-21 10:10:39 +01:00 committed by Greg Kroah-Hartman
parent 43ce748ff2
commit 7a1046e5c0
2 changed files with 15 additions and 25 deletions
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28
drivers/staging/comedi/drivers/s626.c
View File

@ -731,7 +731,7 @@ static uint16_t s626_get_mode_a(struct comedi_device *dev,
/* Set ClkPol to indicate count direction (CntSrcA<0>). */
clkpol = cntsrc & 1;
/* ClkMult must be 1x in Timer mode. */
clkmult = S626_MULT_X1;
clkmult = S626_CLKMULT_1X;
} else {
/* Counter mode (CntSrcA<1> == 0): */
encmode = S626_ENCMODE_COUNTER;
@ -739,8 +739,8 @@ static uint16_t s626_get_mode_a(struct comedi_device *dev,
clkpol = S626_GET_CRA_CLKPOL_A(cra);
/* Force ClkMult to 1x if not legal, else pass through. */
clkmult = S626_GET_CRA_CLKMULT_A(cra);
if (clkmult == S626_MULT_X0)
clkmult = S626_MULT_X1;
if (clkmult == S626_CLKMULT_SPECIAL)
clkmult = S626_CLKMULT_1X;
}
setup |= S626_SET_STD_ENCMODE(encmode) | S626_SET_STD_CLKMULT(clkmult) |
S626_SET_STD_CLKPOL(clkpol);
@ -781,18 +781,18 @@ static uint16_t s626_get_mode_b(struct comedi_device *dev,
/* Adjust mode-dependent parameters. */
cntsrc = S626_GET_CRA_CNTSRC_B(cra);
clkmult = S626_GET_CRB_CLKMULT_B(crb);
if (clkmult == S626_MULT_X0) {
/* Extender mode (ClkMultB == S626_MULT_X0): */
if (clkmult == S626_CLKMULT_SPECIAL) {
/* Extender mode (ClkMultB == S626_CLKMULT_SPECIAL): */
encmode = S626_ENCMODE_EXTENDER;
/* Indicate multiplier is 1x. */
clkmult = S626_MULT_X1;
clkmult = S626_CLKMULT_1X;
/* Set ClkPol equal to Timer count direction (CntSrcB<0>). */
clkpol = cntsrc & 1;
} else if (cntsrc & S626_CNTSRC_SYSCLK) {
/* Timer mode (CntSrcB<1> == 1): */
encmode = S626_ENCMODE_TIMER;
/* Indicate multiplier is 1x. */
clkmult = S626_MULT_X1;
clkmult = S626_CLKMULT_1X;
/* Set ClkPol equal to Timer count direction (CntSrcB<0>). */
clkpol = cntsrc & 1;
} else {
@ -853,7 +853,7 @@ static void s626_set_mode_a(struct comedi_device *dev,
/* ClkPolA behaves as always-on clock enable. */
clkpol = 1;
/* ClkMult must be 1x. */
clkmult = S626_MULT_X1;
clkmult = S626_CLKMULT_1X;
break;
default: /* Counter Mode: */
/* Select ENC_C and ENC_D as clock/direction inputs. */
@ -861,8 +861,8 @@ static void s626_set_mode_a(struct comedi_device *dev,
/* Clock polarity is passed through. */
/* Force multiplier to x1 if not legal, else pass through. */
clkmult = S626_GET_STD_CLKMULT(setup);
if (clkmult == S626_MULT_X0)
clkmult = S626_MULT_X1;
if (clkmult == S626_CLKMULT_SPECIAL)
clkmult = S626_CLKMULT_1X;
break;
}
cra |= S626_SET_CRA_CNTSRC_A(cntsrc) | S626_SET_CRA_CLKPOL_A(clkpol) |
@ -927,7 +927,7 @@ static void s626_set_mode_b(struct comedi_device *dev,
/* ClkPolB behaves as always-on clock enable. */
clkpol = 1;
/* ClkMultB must be 1x. */
clkmult = S626_MULT_X1;
clkmult = S626_CLKMULT_1X;
break;
case S626_ENCMODE_EXTENDER: /* Extender Mode: */
/* CntSrcB source is OverflowA (same as "timer") */
@ -937,7 +937,7 @@ static void s626_set_mode_b(struct comedi_device *dev,
/* ClkPolB controls IndexB -- always set to active. */
clkpol = 1;
/* ClkMultB selects OverflowA as the clock source. */
clkmult = S626_MULT_X0;
clkmult = S626_CLKMULT_SPECIAL;
break;
default: /* Counter Mode: */
/* Select ENC_C and ENC_D as clock/direction inputs. */
@ -945,8 +945,8 @@ static void s626_set_mode_b(struct comedi_device *dev,
/* ClkPol is passed through. */
/* Force ClkMult to x1 if not legal, otherwise pass through. */
clkmult = S626_GET_STD_CLKMULT(setup);
if (clkmult == S626_MULT_X0)
clkmult = S626_MULT_X1;
if (clkmult == S626_CLKMULT_SPECIAL)
clkmult = S626_CLKMULT_1X;
break;
}
cra |= S626_SET_CRA_CNTSRC_B(cntsrc);

12
drivers/staging/comedi/drivers/s626.h
View File

@ -498,17 +498,7 @@
#define S626_CLKMULT_4X 0 /* 4x clock multiplier. */
#define S626_CLKMULT_2X 1 /* 2x clock multiplier. */
#define S626_CLKMULT_1X 2 /* 1x clock multiplier. */
/* Enumerated counter clock multipliers. */
#define S626_MULT_X0 0x0003 /* Supports no multipliers;
* fixed physical multiplier = 3. */
#define S626_MULT_X1 0x0002 /* Supports multiplier x1;
* fixed physical multiplier = 2. */
#define S626_MULT_X2 0x0001 /* Supports multipliers x1, x2;
* physical multipliers = 1 or 2. */
#define S626_MULT_X4 0x0000 /* Supports multipliers x1, x2, x4;
* physical multipliers = 0, 1 or 2. */
#define S626_CLKMULT_SPECIAL 3 /* Special clock multiplier value. */
/* Sanity-check limits for parameters. */