soc/amd/picasso: Move aoac functions to new file

This functionality is needed in the PSP and I can't include all of
southbridge.c.

BUG=b:153001807
TEST=Made sure trembyle still compiles

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I3a38c655588d7836e1bd033e958a505774de871e
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42324
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 97 insertions, 0 deletions

diff --git a/src/soc/amd/picasso/aoac.c b/src/soc/amd/picasso/aoac.c
new file mode 100644
index 0000000000..35adc24723
--- /dev/null
+++ b/src/soc/amd/picasso/aoac.c
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <stdint.h>
+#include <amdblocks/acpimmio.h>
+#include <soc/southbridge.h>
+#include <delay.h>
+
+#define FCH_AOAC_UART_FOR_CONSOLE \
+		(CONFIG_UART_FOR_CONSOLE == 0 ? FCH_AOAC_DEV_UART0 \
+		: CONFIG_UART_FOR_CONSOLE == 1 ? FCH_AOAC_DEV_UART1 \
+		: CONFIG_UART_FOR_CONSOLE == 2 ? FCH_AOAC_DEV_UART2 \
+		: CONFIG_UART_FOR_CONSOLE == 3 ? FCH_AOAC_DEV_UART3 \
+		: -1)
+#if FCH_AOAC_UART_FOR_CONSOLE == -1
+# error Unsupported UART_FOR_CONSOLE chosen
+#endif
+
+/*
+ * Table of devices that need their AOAC registers enabled and waited
+ * upon (usually about .55 milliseconds). Instead of individual delays
+ * waiting for each device to become available, a single delay will be
+ * executed.  The console UART is handled separately from this table.
+ */
+const static int aoac_devs[] = {
+	FCH_AOAC_DEV_AMBA,
+	FCH_AOAC_DEV_I2C2,
+	FCH_AOAC_DEV_I2C3,
+	FCH_AOAC_DEV_I2C4,
+	FCH_AOAC_DEV_ESPI,
+};
+
+void power_on_aoac_device(int dev)
+{
+	uint8_t byte;
+
+	/* Power on the UART and AMBA devices */
+	byte = aoac_read8(AOAC_DEV_D3_CTL(dev));
+	byte |= FCH_AOAC_PWR_ON_DEV;
+	aoac_write8(AOAC_DEV_D3_CTL(dev), byte);
+}
+
+void power_off_aoac_device(int dev)
+{
+	uint8_t byte;
+
+	/* Power on the UART and AMBA devices */
+	byte = aoac_read8(AOAC_DEV_D3_CTL(dev));
+	byte &= ~FCH_AOAC_PWR_ON_DEV;
+	aoac_write8(AOAC_DEV_D3_CTL(dev), byte);
+}
+
+bool is_aoac_device_enabled(int dev)
+{
+	uint8_t byte;
+
+	byte = aoac_read8(AOAC_DEV_D3_STATE(dev));
+	byte &= (FCH_AOAC_PWR_RST_STATE | FCH_AOAC_RST_CLK_OK_STATE);
+	if (byte == (FCH_AOAC_PWR_RST_STATE | FCH_AOAC_RST_CLK_OK_STATE))
+		return true;
+	else
+		return false;
+}
+
+static void enable_aoac_console_uart(void)
+{
+	if (!CONFIG(PICASSO_UART))
+		return;
+
+	power_on_aoac_device(FCH_AOAC_UART_FOR_CONSOLE);
+}
+
+static bool is_aoac_console_uart_enabled(void)
+{
+	if (!CONFIG(PICASSO_UART))
+		return true;
+
+	return is_aoac_device_enabled(FCH_AOAC_UART_FOR_CONSOLE);
+}
+
+void enable_aoac_devices(void)
+{
+	bool status;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(aoac_devs); i++)
+		power_on_aoac_device(aoac_devs[i]);
+	enable_aoac_console_uart();
+
+	/* Wait for AOAC devices to indicate power and clock OK */
+	do {
+		udelay(100);
+		status = true;
+		for (i = 0; i < ARRAY_SIZE(aoac_devs); i++)
+			status &= is_aoac_device_enabled(aoac_devs[i]);
+		status &= is_aoac_console_uart_enabled();
+	} while (!status);
+}