Generate ACPI information for this device so that Linux can use it correctly.
Signed-off-by: Simon Glass sjg@chromium.org ---
drivers/tpm/cr50_i2c.c | 55 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+)
diff --git a/drivers/tpm/cr50_i2c.c b/drivers/tpm/cr50_i2c.c index d68534e7a9..5a3db87125 100644 --- a/drivers/tpm/cr50_i2c.c +++ b/drivers/tpm/cr50_i2c.c @@ -8,6 +8,8 @@ #define LOG_CATEGORY UCLASS_TPM
#include <common.h> +#include <acpigen.h> +#include <acpi_device.h> #include <dm.h> #include <i2c.h> #include <irq.h> @@ -17,6 +19,7 @@ #include <asm/io.h> #include <asm/arch/iomap.h> #include <asm/arch/pm.h> +#include <dm/acpi.h>
enum { TIMEOUT_INIT_MS = 30000, /* Very long timeout for TPM init */ @@ -580,6 +583,53 @@ 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_device_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,desc")); + 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) + return log_msg_ret("i2c", ret); + ret = acpi_device_write_interrupt_or_gpio(ctx, (struct udevice *)dev, + "ready-gpios"); + if (ret) + 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, @@ -652,6 +702,10 @@ 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, @@ -674,5 +728,6 @@ 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, };