soc/amd/picasso: Add ability to enable/disable UART to device tree
If we are not using the UARTs or they don't have the correct GPIOs
configured we should let the mainboard disable them.
BUG=b:153001807
TEST=Dump SSDT and see UART device is disabled
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ifc04e36e0ebe5cce4b6cc228c7174dc76f2ffa4a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42327
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
diff --git a/src/soc/amd/picasso/uart.c b/src/soc/amd/picasso/uart.c
index 0d97fd7..42ae8e6 100644
--- a/src/soc/amd/picasso/uart.c
+++ b/src/soc/amd/picasso/uart.c
@@ -1,6 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0-only */
+#include <acpi/acpigen.h>
#include <console/uart.h>
+#include <console/console.h>
#include <commonlib/helpers.h>
#include <device/mmio.h>
#include <amdblocks/gpio_banks.h>
@@ -108,9 +110,52 @@
}
}
+/* Even though this is called enable, it gets called for both enabled and disabled devices. */
+static void uart_enable(struct device *dev)
+{
+ int dev_id;
+
+ switch (dev->path.mmio.addr) {
+ case APU_UART0_BASE:
+ dev_id = FCH_AOAC_DEV_UART0;
+ break;
+ case APU_UART1_BASE:
+ dev_id = FCH_AOAC_DEV_UART1;
+ break;
+ case APU_UART2_BASE:
+ dev_id = FCH_AOAC_DEV_UART2;
+ break;
+ case APU_UART3_BASE:
+ dev_id = FCH_AOAC_DEV_UART3;
+ break;
+ default:
+ printk(BIOS_ERR, "%s: Unknown device: %s\n", __func__, dev_path(dev));
+ return;
+ }
+
+ if (dev->enabled) {
+ power_on_aoac_device(dev_id);
+ wait_for_aoac_enabled(dev_id);
+ } else {
+ power_off_aoac_device(dev_id);
+ }
+}
+
+/* This gets called for both enabled and disabled devices. */
+static void uart_inject_ssdt(const struct device *dev)
+{
+ acpigen_write_scope(acpi_device_path(dev));
+
+ acpigen_write_STA(acpi_device_status(dev));
+
+ acpigen_pop_len(); /* Scope */
+}
+
struct device_operations picasso_uart_mmio_ops = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.scan_bus = scan_static_bus,
.acpi_name = uart_acpi_name,
+ .enable = uart_enable,
+ .acpi_fill_ssdt = uart_inject_ssdt,
};