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authorKylene Jo Hall <kjhall@us.ibm.com>2006-04-22 05:39:44 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-22 12:19:55 -0400
commit5713556843aee24f484f445db6540f9fef976439 (patch)
treef5366b4f21684524b5b453acdd1d2cc7d9cf6b15 /drivers/char/tpm/tpm_tis.c
parentcb5354253af2bc30ed449b8be4b3bddf3b3a2746 (diff)
[PATCH] tpm: add interrupt module parameter
This patch adds a boolean module parameter that allows the user to turn interrupt support on and off. The default behavior is to attempt to use interrupts. Signed-off-by: Kylene Hall <kjhall@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/tpm/tpm_tis.c')
-rw-r--r--drivers/char/tpm/tpm_tis.c78
1 files changed, 43 insertions, 35 deletions
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index 398514745d3f..447f76388067 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -16,6 +16,9 @@
16 * published by the Free Software Foundation, version 2 of the 16 * published by the Free Software Foundation, version 2 of the
17 * License. 17 * License.
18 */ 18 */
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/moduleparam.h>
19#include <linux/pnp.h> 22#include <linux/pnp.h>
20#include <linux/interrupt.h> 23#include <linux/interrupt.h>
21#include <linux/wait.h> 24#include <linux/wait.h>
@@ -424,6 +427,10 @@ static irqreturn_t tis_int_handler(int irq, void *dev_id, struct pt_regs *regs)
424 return IRQ_HANDLED; 427 return IRQ_HANDLED;
425} 428}
426 429
430static int interrupts = 1;
431module_param(interrupts, bool, 0444);
432MODULE_PARM_DESC(interrupts, "Enable interrupts");
433
427static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev, 434static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
428 const struct pnp_device_id *pnp_id) 435 const struct pnp_device_id *pnp_id)
429{ 436{
@@ -510,44 +517,44 @@ static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
510 iowrite32(intmask, 517 iowrite32(intmask,
511 chip->vendor.iobase + 518 chip->vendor.iobase +
512 TPM_INT_ENABLE(chip->vendor.locality)); 519 TPM_INT_ENABLE(chip->vendor.locality));
520 if (interrupts) {
521 chip->vendor.irq =
522 ioread8(chip->vendor.iobase +
523 TPM_INT_VECTOR(chip->vendor.locality));
524
525 for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
526 iowrite8(i, chip->vendor.iobase +
527 TPM_INT_VECTOR(chip->vendor.locality));
528 if (request_irq
529 (i, tis_int_probe, SA_SHIRQ,
530 chip->vendor.miscdev.name, chip) != 0) {
531 dev_info(chip->dev,
532 "Unable to request irq: %d for probe\n",
533 i);
534 continue;
535 }
513 536
514 chip->vendor.irq = 537 /* Clear all existing */
515 ioread8(chip->vendor.iobase + 538 iowrite32(ioread32
516 TPM_INT_VECTOR(chip->vendor.locality)); 539 (chip->vendor.iobase +
517 540 TPM_INT_STATUS(chip->vendor.locality)),
518 for (i = 3; i < 16 && chip->vendor.irq == 0; i++) { 541 chip->vendor.iobase +
519 iowrite8(i, 542 TPM_INT_STATUS(chip->vendor.locality));
520 chip->vendor.iobase +
521 TPM_INT_VECTOR(chip->vendor.locality));
522 if (request_irq
523 (i, tis_int_probe, SA_SHIRQ,
524 chip->vendor.miscdev.name, chip) != 0) {
525 dev_info(chip->dev,
526 "Unable to request irq: %d for probe\n",
527 i);
528 continue;
529 }
530
531 /* Clear all existing */
532 iowrite32(ioread32
533 (chip->vendor.iobase +
534 TPM_INT_STATUS(chip->vendor.locality)),
535 chip->vendor.iobase +
536 TPM_INT_STATUS(chip->vendor.locality));
537 543
538 /* Turn on */ 544 /* Turn on */
539 iowrite32(intmask | TPM_GLOBAL_INT_ENABLE, 545 iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
540 chip->vendor.iobase + 546 chip->vendor.iobase +
541 TPM_INT_ENABLE(chip->vendor.locality)); 547 TPM_INT_ENABLE(chip->vendor.locality));
542 548
543 /* Generate Interrupts */ 549 /* Generate Interrupts */
544 tpm_gen_interrupt(chip); 550 tpm_gen_interrupt(chip);
545 551
546 /* Turn off */ 552 /* Turn off */
547 iowrite32(intmask, 553 iowrite32(intmask,
548 chip->vendor.iobase + 554 chip->vendor.iobase +
549 TPM_INT_ENABLE(chip->vendor.locality)); 555 TPM_INT_ENABLE(chip->vendor.locality));
550 free_irq(i, chip); 556 free_irq(i, chip);
557 }
551 } 558 }
552 if (chip->vendor.irq) { 559 if (chip->vendor.irq) {
553 iowrite8(chip->vendor.irq, 560 iowrite8(chip->vendor.irq,
@@ -557,7 +564,8 @@ static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
557 (chip->vendor.irq, tis_int_handler, SA_SHIRQ, 564 (chip->vendor.irq, tis_int_handler, SA_SHIRQ,
558 chip->vendor.miscdev.name, chip) != 0) { 565 chip->vendor.miscdev.name, chip) != 0) {
559 dev_info(chip->dev, 566 dev_info(chip->dev,
560 "Unable to request irq: %d for use\n", i); 567 "Unable to request irq: %d for use\n",
568 chip->vendor.irq);
561 chip->vendor.irq = 0; 569 chip->vendor.irq = 0;
562 } else { 570 } else {
563 /* Clear all existing */ 571 /* Clear all existing */