Commit e3837e74 authored by Jason Gunthorpe's avatar Jason Gunthorpe Committed by Jarkko Sakkinen

tpm_tis: Refactor the interrupt setup

Now that the probe and run cases are merged together we can use a
much simpler setup flow where probe and normal setup are done with
exactly the same code.

Since the new flow always calls tpm_gen_interrupt to confirm the IRQ
there is also no longer any need to call tpm_get_timeouts twice.
Signed-off-by: default avatarJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: default avatarMartin Wilck <Martin.Wilck@ts.fujitsu.com>
Tested-by: default avatarScot Doyle <lkml14@scotdoyle.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: default avatarPeter Huewe <peterhuewe@gmx.de>
parent 7ab4032f
......@@ -99,7 +99,6 @@ static struct tpm_info tis_default_info = {
#define TPM_RID(l) (0x0F04 | ((l) << 12))
struct priv_data {
bool irq_probing;
bool irq_tested;
};
......@@ -462,12 +461,8 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
chip->vendor.irq = irq;
if (!priv->irq_tested)
msleep(1);
if (!priv->irq_tested) {
if (!priv->irq_tested)
disable_interrupts(chip);
if (!priv->irq_probing)
dev_err(chip->pdev, FW_BUG
"TPM interrupt not working, polling instead\n");
}
priv->irq_tested = true;
return rc;
}
......@@ -604,6 +599,80 @@ static irqreturn_t tis_int_handler(int dummy, void *dev_id)
return IRQ_HANDLED;
}
/* Register the IRQ and issue a command that will cause an interrupt. If an
* irq is seen then leave the chip setup for IRQ operation, otherwise reverse
* everything and leave in polling mode. Returns 0 on success.
*/
static int tpm_tis_probe_irq_single(struct tpm_chip *chip, u32 intmask, int irq)
{
struct priv_data *priv = chip->vendor.priv;
u8 original_int_vec;
if (devm_request_irq(chip->pdev, irq, tis_int_handler, IRQF_SHARED,
chip->devname, chip) != 0) {
dev_info(chip->pdev, "Unable to request irq: %d for probe\n",
irq);
return -1;
}
chip->vendor.irq = irq;
original_int_vec = ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
iowrite8(irq,
chip->vendor.iobase + TPM_INT_VECTOR(chip->vendor.locality));
/* Clear all existing */
iowrite32(ioread32(chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality)),
chip->vendor.iobase + TPM_INT_STATUS(chip->vendor.locality));
/* Turn on */
iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
priv->irq_tested = false;
/* Generate an interrupt by having the core call through to
* tpm_tis_send
*/
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_gen_interrupt(chip);
else
tpm_gen_interrupt(chip);
/* tpm_tis_send will either confirm the interrupt is working or it
* will call disable_irq which undoes all of the above.
*/
if (!chip->vendor.irq) {
iowrite8(original_int_vec,
chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
return 1;
}
return 0;
}
/* Try to find the IRQ the TPM is using. This is for legacy x86 systems that
* do not have ACPI/etc. We typically expect the interrupt to be declared if
* present.
*/
static void tpm_tis_probe_irq(struct tpm_chip *chip, u32 intmask)
{
u8 original_int_vec;
int i;
original_int_vec = ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
if (!original_int_vec) {
for (i = 3; i <= 15; i++)
if (!tpm_tis_probe_irq_single(chip, intmask, i))
return;
} else if (!tpm_tis_probe_irq_single(chip, intmask, original_int_vec))
return;
}
static bool interrupts = true;
module_param(interrupts, bool, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");
......@@ -626,8 +695,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
acpi_handle acpi_dev_handle)
{
u32 vendor, intfcaps, intmask;
int rc, i, irq_s, irq_e, probe;
int irq_r = -1;
int rc, probe;
struct tpm_chip *chip;
struct priv_data *priv;
......@@ -735,98 +803,14 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info,
/* INTERRUPT Setup */
init_waitqueue_head(&chip->vendor.read_queue);
init_waitqueue_head(&chip->vendor.int_queue);
if (interrupts)
chip->vendor.irq = tpm_info->irq;
if (interrupts && !chip->vendor.irq) {
irq_s =
ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
irq_r = irq_s;
if (irq_s) {
irq_e = irq_s;
} else {
irq_s = 3;
irq_e = 15;
}
for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
iowrite8(i, chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
if (devm_request_irq
(dev, i, tis_int_handler, IRQF_SHARED,
chip->devname, chip) != 0) {
dev_info(chip->pdev,
"Unable to request irq: %d for probe\n",
i);
continue;
}
chip->vendor.irq = i;
/* Clear all existing */
iowrite32(ioread32
(chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality)),
chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality));
/* Turn on */
iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
priv->irq_tested = false;
priv->irq_probing = true;
/* Generate Interrupts */
if (chip->flags & TPM_CHIP_FLAG_TPM2)
tpm2_gen_interrupt(chip);
else
tpm_gen_interrupt(chip);
priv->irq_probing = false;
/* tpm_tis_send will either confirm the interrupt is
* working or it will call disable_irq which undoes
* all of the above.
*/
if (chip->vendor.irq)
break;
}
if (interrupts) {
if (tpm_info->irq) {
tpm_tis_probe_irq_single(chip, intmask, tpm_info->irq);
if (!chip->vendor.irq)
iowrite8(irq_r, chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
}
if (chip->vendor.irq && !priv->irq_tested) {
iowrite8(chip->vendor.irq,
chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
if (devm_request_irq
(dev, chip->vendor.irq, tis_int_handler, IRQF_SHARED,
chip->devname, chip) != 0) {
dev_info(chip->pdev,
"Unable to request irq: %d for use\n",
chip->vendor.irq);
chip->vendor.irq = 0;
} else {
/* Clear all existing */
iowrite32(ioread32
(chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality)),
chip->vendor.iobase +
TPM_INT_STATUS(chip->vendor.locality));
/* Turn on */
iowrite32(intmask | TPM_GLOBAL_INT_ENABLE,
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
}
}
if (tpm_get_timeouts(chip)) {
dev_err(dev, "Could not get TPM timeouts and durations\n");
rc = -ENODEV;
goto out_err;
dev_err(chip->pdev, FW_BUG
"TPM interrupt not working, polling instead\n");
} else
tpm_tis_probe_irq(chip, intmask);
}
if (chip->flags & TPM_CHIP_FLAG_TPM2) {
......
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