drivers/i2c/rx6110sa: Add basic ACPI support
This patch adds basic ACPI support for the RTC so that the OS is able to
use this RTC via the ACPI interface.
If the Linux kernel is able to find the RTC in ACPI scope, you should
see the following lines in dmesg, where [n] is an enumerated number:
rx6110 i2c-RX6110SA:00: rtc core: registered RX6110SA:00 as rtc[n]
rtc rtc[n]: Update timer was detected
Change-Id: I9b319e3088e6511592075b055f8fa3e2aedaa209
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47235
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/drivers/i2c/rx6110sa/rx6110sa.c b/src/drivers/i2c/rx6110sa/rx6110sa.c
index ca39bdb..2b8b9b2 100644
--- a/src/drivers/i2c/rx6110sa/rx6110sa.c
+++ b/src/drivers/i2c/rx6110sa/rx6110sa.c
@@ -1,7 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0-only */
-#include <device/i2c_bus.h>
+#include <acpi/acpi_device.h>
+#include <acpi/acpigen.h>
#include <device/device.h>
+#include <device/i2c.h>
+#include <device/i2c_bus.h>
#include <version.h>
#include <console/console.h>
#include <bcd.h>
@@ -163,11 +166,71 @@
rx6110sa_write(dev, CTRL_REG, reg);
}
+#if CONFIG(HAVE_ACPI_TABLES)
+static void rx6110sa_fill_ssdt(const struct device *dev)
+{
+ struct drivers_i2c_rx6110sa_config *config = dev->chip_info;
+ const char *scope = acpi_device_scope(dev);
+ enum i2c_speed bus_speed;
+
+ if (!scope)
+ return;
+
+ switch (config->bus_speed) {
+ case I2C_SPEED_STANDARD:
+ case I2C_SPEED_FAST:
+ bus_speed = config->bus_speed;
+ break;
+ default:
+ printk(BIOS_INFO, "%s: Bus speed unsupported, fall back to %d kHz!\n",
+ dev_path(dev), I2C_SPEED_STANDARD / 1000);
+ bus_speed = I2C_SPEED_STANDARD;
+ break;
+ }
+
+ struct acpi_i2c i2c = {
+ .address = dev->path.i2c.device,
+ .mode_10bit = dev->path.i2c.mode_10bit,
+ .speed = bus_speed,
+ .resource = scope,
+ };
+
+ /* Device */
+ acpigen_write_scope(scope);
+ acpigen_write_device(acpi_device_name(dev));
+ acpigen_write_name_string("_HID", RX6110SA_HID_NAME);
+ acpigen_write_name_string("_DDN", RX6110SA_HID_DESC);
+ acpigen_write_STA(acpi_device_status(dev));
+
+ /* Resources */
+ acpigen_write_name("_CRS");
+ acpigen_write_resourcetemplate_header();
+ acpi_device_write_i2c(&i2c);
+
+ acpigen_write_resourcetemplate_footer();
+
+ acpigen_pop_len(); /* Device */
+ acpigen_pop_len(); /* Scope */
+
+ printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev),
+ dev->chip_ops->name, dev_path(dev));
+}
+
+static const char *rx6110sa_acpi_name(const struct device *dev)
+{
+ return RX6110SA_ACPI_NAME;
+}
+#endif
+
static struct device_operations rx6110sa_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.init = rx6110sa_init,
- .final = rx6110sa_final
+ .final = rx6110sa_final,
+#if CONFIG(HAVE_ACPI_TABLES)
+ .acpi_name = rx6110sa_acpi_name,
+ .acpi_fill_ssdt = rx6110sa_fill_ssdt,
+#endif
};
static void rx6110sa_enable(struct device *dev)