1 files changed, 102 insertions, 0 deletions
diff --git a/src/soc/amd/sabrina/uart.c b/src/soc/amd/sabrina/uart.c
new file mode 100644
index 0000000000..c48c3da40f
--- /dev/null
+++ b/src/soc/amd/sabrina/uart.c
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* TODO: Check if this is still correct */
+
+#include <amdblocks/aoac.h>
+#include <amdblocks/gpio.h>
+#include <amdblocks/uart.h>
+#include <commonlib/helpers.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/mmio.h>
+#include <soc/aoac_defs.h>
+#include <soc/gpio.h>
+#include <soc/southbridge.h>
+#include <soc/uart.h>
+#include <types.h>
+
+static const struct {
+	uintptr_t base;
+	struct soc_amd_gpio mux[2];
+} uart_info[] = {
+	[0] = { APU_UART0_BASE, {
+			PAD_NF(GPIO_143, UART0_TXD, PULL_NONE),
+			PAD_NF(GPIO_141, UART0_RXD, PULL_NONE),
+	} },
+	[1] = { APU_UART1_BASE, {
+			PAD_NF(GPIO_140, UART1_TXD, PULL_NONE),
+			PAD_NF(GPIO_142, UART1_RXD, PULL_NONE),
+	} },
+};
+
+uintptr_t get_uart_base(unsigned int idx)
+{
+	if (idx >= ARRAY_SIZE(uart_info))
+		return 0;
+
+	return uart_info[idx].base;
+}
+
+void clear_uart_legacy_config(void)
+{
+	write16((void *)FCH_LEGACY_UART_DECODE, 0);
+}
+
+void set_uart_config(unsigned int idx)
+{
+	if (idx >= ARRAY_SIZE(uart_info))
+		return;
+
+	gpio_configure_pads(uart_info[idx].mux, 2);
+}
+
+static const char *uart_acpi_name(const struct device *dev)
+{
+	switch (dev->path.mmio.addr) {
+	case APU_UART0_BASE:
+		return "FUR0";
+	case APU_UART1_BASE:
+		return "FUR1";
+	default:
+		return NULL;
+	}
+}
+
+/* Even though this is called enable, it gets called for both enabled and disabled devices. */
+static void uart_enable(struct device *dev)
+{
+	unsigned 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;
+	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);
+	}
+}
+
+static void uart_read_resources(struct device *dev)
+{
+	mmio_resource(dev, 0, dev->path.mmio.addr / KiB, 4);
+}
+
+struct device_operations sabrina_uart_mmio_ops = {
+	.read_resources = uart_read_resources,
+	.set_resources = noop_set_resources,
+	.scan_bus = scan_static_bus,
+	.enable = uart_enable,
+	.acpi_name = uart_acpi_name,
+	.acpi_fill_ssdt = uart_inject_ssdt,
+};