soc/amd/sabrina: add new SoC as copy of soc/amd/cezanne

The Cezanne SoC code was initially started as a copy of example/min86
which only provides enough code to make the SoC code build. Then the
different parts of the real SoC support was brought in patch by patch
which also helped cleaning up and untangling the code. Since the Cezanne
SoC code is now in a rather good shape and the Sabrina SoC is similar to
the Cezanne SoC from the coreboot side, the new SoC support is started
with a copy of the Cezanne code and all the needed changes will be
applied on top of that. In order for the build not to fail due to
duplicate files, this patch does not only copy the directory, but also
replaces most instances of the Cezanne name with Sabrina. Since the
needed blobs aren't available in the 3rdparty/amd_blobs repository yet,
the Cezanne blobs are used for now so that the build will succeed. As
soon as the proper blobs will be available in that repository, the code
will be switched over to use them.

As suggested by Nico, I added a "TODO: Check if this is still correct"
comment to the beginning of every copied file and all SOC_AMD_COMMON_*
Kconfig option selects which will be removed after re-verifying that
each file and each selected common code block is still correct for the
new SoC.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I978ddbdbfd70863acac17d98732936ec2be8fe3c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/61077
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

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,
+};