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tpm: cr50: Add ACPI support

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Generate ACPI information for this device so that Linux can use it
correctly.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2020-09-22 12:45:24 -06:00 committed by Bin Meng
parent ca60199fee
commit eaac971736
1 changed files with 55 additions and 0 deletions
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55
drivers/tpm/cr50_i2c.c
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@ -14,11 +14,14 @@
#include <log.h>
#include <spl.h>
#include <tpm-v2.h>
#include <acpi/acpigen.h>
#include <acpi/acpi_device.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/iomap.h>
#include <asm/arch/pm.h>
#include <linux/delay.h>
#include <dm/acpi.h>
enum {
TIMEOUT_INIT_MS = 30000, /* Very long timeout for TPM init */
@ -581,6 +584,53 @@ static int cr50_i2c_cleanup(struct udevice *dev)
return 0;
}
static int cr50_acpi_fill_ssdt(const struct udevice *dev, struct acpi_ctx *ctx)
{
char scope[ACPI_PATH_MAX];
char name[ACPI_NAME_MAX];
const char *hid;
int ret;
ret = acpi_device_scope(dev, scope, sizeof(scope));
if (ret)
return log_msg_ret("scope", ret);
ret = acpi_get_name(dev, name);
if (ret)
return log_msg_ret("name", ret);
hid = dev_read_string(dev, "acpi,hid");
if (!hid)
return log_msg_ret("hid", ret);
/* Device */
acpigen_write_scope(ctx, scope);
acpigen_write_device(ctx, name);
acpigen_write_name_string(ctx, "_HID", hid);
acpigen_write_name_integer(ctx, "_UID",
dev_read_u32_default(dev, "acpi,uid", 0));
acpigen_write_name_string(ctx, "_DDN",
dev_read_string(dev, "acpi,ddn"));
acpigen_write_sta(ctx, acpi_device_status(dev));
/* Resources */
acpigen_write_name(ctx, "_CRS");
acpigen_write_resourcetemplate_header(ctx);
ret = acpi_device_write_i2c_dev(ctx, dev);
if (ret < 0)
return log_msg_ret("i2c", ret);
ret = acpi_device_write_interrupt_or_gpio(ctx, (struct udevice *)dev,
"ready-gpios");
if (ret < 0)
return log_msg_ret("irq_gpio", ret);
acpigen_write_resourcetemplate_footer(ctx);
acpigen_pop_len(ctx); /* Device */
acpigen_pop_len(ctx); /* Scope */
return 0;
}
enum {
TPM_TIMEOUT_MS = 5,
SHORT_TIMEOUT_MS = 750,
@ -653,6 +703,10 @@ static int cr50_i2c_probe(struct udevice *dev)
return 0;
}
struct acpi_ops cr50_acpi_ops = {
.fill_ssdt = cr50_acpi_fill_ssdt,
};
static const struct tpm_ops cr50_i2c_ops = {
.open = cr50_i2c_open,
.get_desc = cr50_i2c_get_desc,
@ -675,5 +729,6 @@ U_BOOT_DRIVER(cr50_i2c) = {
.probe = cr50_i2c_probe,
.remove = cr50_i2c_cleanup,
.priv_auto_alloc_size = sizeof(struct cr50_priv),
ACPI_OPS_PTR(&cr50_acpi_ops)
.flags = DM_FLAG_OS_PREPARE,
};