soc/amd/picasso/uart: factor out console-related functions

Move uart_platform_base and uart_platform_refclk to their own
compilation unit to avoid preprocessor usage. The newly created
compilation unit is only added to the build when PICASSO_CONSOLE_UART
is selected.

Change-Id: I56911addc8c000a0772156e5166720867cdd26fe
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42517
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/picasso/Makefile.inc

@@ -16,6 +16,7 @@ bootblock-y += aoac.c
 bootblock-y += southbridge.c
 bootblock-y += i2c.c
 bootblock-y += uart.c
+bootblock-$(CONFIG_PICASSO_CONSOLE_UART) += uart_console.c
 bootblock-y += tsc_freq.c
 bootblock-y += gpio.c
 bootblock-y += smi_util.c
@@ -27,6 +28,7 @@ romstage-y += gpio.c
 romstage-y += pmutil.c
 romstage-y += memmap.c
 romstage-y += uart.c
+romstage-$(CONFIG_PICASSO_CONSOLE_UART) += uart_console.c
 romstage-y += tsc_freq.c
 romstage-y += aoac.c
 romstage-y += southbridge.c
@@ -41,6 +43,7 @@ verstage-y += pmutil.c
 verstage-y += config.c
 verstage-y += aoac.c
 verstage-y += uart.c
+verstage-$(CONFIG_PICASSO_CONSOLE_UART) += uart_console.c
 verstage-y += tsc_freq.c
 
 ramstage-y += i2c.c
@@ -61,6 +64,7 @@ ramstage-y += memmap.c
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi.c
 ramstage-$(CONFIG_HAVE_SMI_HANDLER) += smi_util.c
 ramstage-y += uart.c
+ramstage-$(CONFIG_PICASSO_CONSOLE_UART) += uart_console.c
 ramstage-y += usb.c
 ramstage-y += tsc_freq.c
 ramstage-y += finalize.c
@@ -76,7 +80,10 @@ all-y += reset.c
 smm-y += smihandler.c
 smm-y += smi_util.c
 smm-y += tsc_freq.c
-smm-$(CONFIG_DEBUG_SMI) += uart.c
+ifeq ($(CONFIG_DEBUG_SMI),y)
+smm-y += uart.c
+smm-$(CONFIG_PICASSO_CONSOLE_UART) += uart_console.c
+endif
 smm-y += gpio.c
 smm-y += psp.c
 smm-y += smu.c

src/soc/amd/picasso/include/soc/southbridge.h

@@ -287,8 +287,6 @@ void southbridge_final(void *chip_info);
 void southbridge_init(void *chip_info);
 void fch_pre_init(void);
 void fch_early_init(void);
-void set_uart_config(int idx);
-void clear_uart_legacy_config(void);
 
 /* Initialize all the i2c buses that are marked with early init. */
 void i2c_soc_early_init(void);

src/soc/amd/picasso/include/soc/uart.h

@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __PICASSO_UART_H__
+#define __PICASSO_UART_H__
+
+#include <types.h>
+
+void set_uart_config(int idx); /* configure hardware of FCH UART selected by idx */
+void clear_uart_legacy_config(void); /* disable legacy I/O decode for FCH UART */
+
+uintptr_t get_uart_base(int idx); /* get MMIO base address of FCH UART */
+
+#endif /* __PICASSO_UART_H__ */

src/soc/amd/picasso/southbridge.c

@@ -21,6 +21,7 @@
 #include <soc/i2c.h>
 #include <soc/southbridge.h>
 #include <soc/smi.h>
+#include <soc/uart.h>
 #include <soc/amd_pci_int_defs.h>
 #include <delay.h>
 #include <soc/pci_devs.h>

src/soc/amd/picasso/uart.c

@@ -1,7 +1,6 @@
 /* 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>
@@ -9,6 +8,7 @@
 #include <amdblocks/acpimmio.h>
 #include <soc/southbridge.h>
 #include <soc/gpio.h>
+#include <soc/uart.h>
 
 static const struct _uart_info {
 	uintptr_t base;
@@ -32,17 +32,7 @@ static const struct _uart_info {
 	} },
 };
 
-/*
- * Don't provide uart_platform_base and uart_platform_refclk functions if PICASSO_CONSOLE_UART
- * isn't selected. Those two functions are used by the console UART driver and need to be
- * provided exactly once and only by the UART that is used for console.
- *
- * TODO: Replace the #if block by factoring out the two functions into a different compilation
- *       unit.
- */
-#if CONFIG(PICASSO_CONSOLE_UART)
-
-uintptr_t uart_platform_base(int idx)
+uintptr_t get_uart_base(int idx)
 {
 	if (idx < 0 || idx >= ARRAY_SIZE(uart_info))
 		return 0;
@@ -50,13 +40,6 @@ uintptr_t uart_platform_base(int idx)
 	return uart_info[idx].base;
 }
 
-unsigned int uart_platform_refclk(void)
-{
-	return CONFIG(PICASSO_UART_48MZ) ? 48000000 : 115200 * 16;
-}
-
-#endif /* PICASSO_CONSOLE_UART */
-
 void clear_uart_legacy_config(void)
 {
 	write16((void *)FCH_UART_LEGACY_DECODE, 0);

src/soc/amd/picasso/uart_console.c

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/uart.h>
+#include <soc/uart.h>
+
+/*
+ * uart_platform_base and uart_platform_refclk are used by the console UART driver and need to
+ * be provided exactly once and only by the UART that is used for console.
+ */
+
+uintptr_t uart_platform_base(int idx)
+{
+	return get_uart_base(idx);
+}
+
+unsigned int uart_platform_refclk(void)
+{
+	return CONFIG(PICASSO_UART_48MZ) ? 48000000 : 115200 * 16;
+}