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lib/regscript: Add exclusive-or (xor) support

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Add xor support which enables toggling of a bit:
* REG_SCRIPT_COMMAND_RXW enum value
* REG_*_RXW* macros to support using REG_SCRIPT_COMMAND_RXW
* REG_*_XOR* macros to support using REG_SCRIPT_COMMAND_RXW
* reg_script_rxw routine to perform and/xor operation
* case in reg_script_run_step to call reg_script_rxw

TEST=Build and run on Galileo Gen2

Change-Id: I50a492c7c2643df5dc2d2fa7113e3722c1e480c7
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14495
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Lee Leahy
2016-04-23 07:58:27 -07:00
committed by Leroy P Leahy
parent 733b39aed4
commit 6bcbe5749b
2 changed files with 95 additions and 0 deletions
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38
src/lib/reg_script.c
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@ -521,6 +521,41 @@ static void reg_script_rmw(struct reg_script_context *ctx)
reg_script_set_step(ctx, step);
}
static void reg_script_rxw(struct reg_script_context *ctx)
{
uint64_t value;
const struct reg_script *step = reg_script_get_step(ctx);
struct reg_script write_step = *step;
/*
* XOR logic table
* Input XOR Value
* 0 0 0
* 0 1 1
* 1 0 1
* 1 1 0
*
* Supported operations
*
* Input Mask Temp XOR Value Operation
* 0 0 0 0 0 Clear bit
* 1 0 0 0 0
* 0 0 0 1 1 Set bit
* 1 0 0 1 1
* 0 1 0 0 0 Preserve bit
* 1 1 1 0 1
* 0 1 0 1 1 Toggle bit
* 1 1 1 1 0
*/
value = reg_script_read(ctx);
value &= step->mask;
value ^= step->value;
write_step.value = value;
reg_script_set_step(ctx, &write_step);
reg_script_write(ctx);
reg_script_set_step(ctx, step);
}
/* In order to easily chain scripts together handle the REG_SCRIPT_COMMAND_NEXT
* as recursive call with a new context that has the same dev and resource
* as the previous one. That will run to completion and then move on to the
@ -544,6 +579,9 @@ static void reg_script_run_step(struct reg_script_context *ctx,
case REG_SCRIPT_COMMAND_RMW:
reg_script_rmw(ctx);
break;
case REG_SCRIPT_COMMAND_RXW:
reg_script_rxw(ctx);
break;
case REG_SCRIPT_COMMAND_POLL:
for (try = 0; try < step->timeout; try += POLL_DELAY) {
value = reg_script_read(ctx) & step->mask;