soc/amd: factor out legacy I/O and cf9 decode enable functions

Replace sb prefix with fch prefix, since those are all FCHs and no south
bridges any more. Verstage on PSP uses the I/O access mechanism instead
of the MMIO one, so keep a separate function for that, but also move it
to the common mmio_util file to have them all in one place.

Change-Id: I47dac9ee3d9e27f7b7a5fddab17cf4fc10de6c3e
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48435
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/common/block/acpimmio/mmio_util.c

@@ -58,6 +58,21 @@ void enable_acpimmio_decode_pm04(void)
 	pm_io_write32(ACPIMMIO_DECODE_REGISTER_04, dw);
 }
 
+void fch_enable_cf9_io(void)
+{
+	pm_write32(PM_DECODE_EN, pm_read32(PM_DECODE_EN) | CF9_IO_EN);
+}
+
+void fch_enable_legacy_io(void)
+{
+	pm_write32(PM_DECODE_EN, pm_read32(PM_DECODE_EN) | LEGACY_IO_EN);
+}
+
+void fch_io_enable_legacy_io(void)
+{
+	pm_io_write32(PM_DECODE_EN, pm_io_read32(PM_DECODE_EN) | LEGACY_IO_EN);
+}
+
 /* PM registers are accessed a byte at a time via CD6/CD7 */
 uint8_t pm_io_read8(uint8_t reg)
 {

src/soc/amd/common/block/include/amdblocks/acpimmio.h

@@ -73,6 +73,9 @@ void enable_acpimmio_decode_pm24(void);
 
 /* For newer integrated FCHs */
 void enable_acpimmio_decode_pm04(void);
+void fch_enable_cf9_io(void);
+void fch_enable_legacy_io(void);
+void fch_io_enable_legacy_io(void);
 
 /* Access PM registers using IO cycles */
 uint8_t pm_io_read8(uint8_t reg);

src/soc/amd/picasso/psp_verstage/fch.c

@@ -102,11 +102,6 @@ uintptr_t *map_spi_rom(void)
 	return addr;
 }
 
-void sb_enable_legacy_io(void)
-{
-	pm_io_write32(PM_DECODE_EN, pm_io_read32(PM_DECODE_EN) | LEGACY_IO_EN);
-}
-
 static uint32_t map_fch_devices(void)
 {
 	void *bar;

src/soc/amd/picasso/psp_verstage/psp_verstage.c

@@ -2,6 +2,7 @@
 
 #include "psp_verstage.h"
 
+#include <amdblocks/acpimmio.h>
 #include <bl_uapp/bl_syscall_public.h>
 #include <boot_device.h>
 #include <cbfs.h>
@@ -237,7 +238,7 @@ void Main(void)
 	verstage_mainboard_early_init();
 
 	svc_write_postcode(POSTCODE_LATE_INIT);
-	sb_enable_legacy_io();
+	fch_io_enable_legacy_io();
 	verstage_soc_init();
 	verstage_mainboard_init();
 

src/soc/amd/picasso/psp_verstage/psp_verstage.h

@@ -55,6 +55,5 @@ uint32_t unmap_fch_devices(void);
 uint32_t verstage_soc_early_init(void);
 void verstage_soc_init(void);
 uintptr_t *map_spi_rom(void);
-void sb_enable_legacy_io(void);
 
 #endif /* PSP_VERSTAGE_H */

src/soc/amd/picasso/southbridge.c

@@ -91,20 +91,6 @@ const struct irq_idx_name *sb_get_apic_reg_association(size_t *size)
 	return irq_association;
 }
 
-static void sb_enable_cf9_io(void)
-{
-	uint32_t reg = pm_read32(PM_DECODE_EN);
-
-	pm_write32(PM_DECODE_EN, reg | CF9_IO_EN);
-}
-
-static void sb_enable_legacy_io(void)
-{
-	uint32_t reg = pm_read32(PM_DECODE_EN);
-
-	pm_write32(PM_DECODE_EN, reg | LEGACY_IO_EN);
-}
-
 void sb_clk_output_48Mhz(void)
 {
 	u32 ctrl;
@@ -131,8 +117,8 @@ void fch_pre_init(void)
 	fch_spi_early_init();
 	enable_acpimmio_decode_pm04();
 	fch_smbus_init();
-	sb_enable_cf9_io();
-	sb_enable_legacy_io();
+	fch_enable_cf9_io();
+	fch_enable_legacy_io();
 	enable_aoac_devices();
 	sb_reset_i2c_slaves();
 

src/soc/amd/stoneyridge/southbridge.c

@@ -200,20 +200,6 @@ static void sb_lpc_decode(void)
 	lpc_enable_decode(tmp);
 }
 
-static void sb_enable_cf9_io(void)
-{
-	uint32_t reg = pm_read32(PM_DECODE_EN);
-
-	pm_write32(PM_DECODE_EN, reg | CF9_IO_EN);
-}
-
-static void sb_enable_legacy_io(void)
-{
-	uint32_t reg = pm_read32(PM_DECODE_EN);
-
-	pm_write32(PM_DECODE_EN, reg | LEGACY_IO_EN);
-}
-
 void sb_clk_output_48Mhz(u32 osc)
 {
 	u32 ctrl;
@@ -347,14 +333,14 @@ void bootblock_fch_early_init(void)
 	sb_disable_4dw_burst(); /* Must be disabled on CZ(ST) */
 	enable_acpimmio_decode_pm04();
 	fch_smbus_init();
-	sb_enable_cf9_io();
+	fch_enable_cf9_io();
 	setup_spread_spectrum(&reboot);
 	setup_misc(&reboot);
 
 	if (reboot)
 		warm_reset();
 
-	sb_enable_legacy_io();
+	fch_enable_legacy_io();
 	enable_aoac_devices();
 }