soc/amd/stoneyridge: split southbridge code

Split the southbridge code into a bootblock and a ramstage part to align
it more with Picasso and Cezanne. Also move the implementation of
fch_clk_output_48Mhz to the end of early_fch.c since it's not really
related to the functions that were previously around it.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ib660fbef8dc25ba0fab803ccd82b3408878d1588
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60142
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

3 files changed, 175 insertions, 171 deletions

diff --git a/src/soc/amd/stoneyridge/Makefile.inc b/src/soc/amd/stoneyridge/Makefile.inc
index 08cdf8a597c4..b2ac43f40b54 100644
--- a/src/soc/amd/stoneyridge/Makefile.inc
+++ b/src/soc/amd/stoneyridge/Makefile.inc
@@ -8,12 +8,12 @@ bootblock-y += aoac.c
 bootblock-y += uart.c
 bootblock-y += BiosCallOuts.c
 bootblock-y += bootblock.c
+bootblock-y += early_fch.c
 bootblock-y += gpio.c
 bootblock-y += i2c.c
 bootblock-y += enable_usbdebug.c
 bootblock-y += monotonic_timer.c
 bootblock-y += tsc_freq.c
-bootblock-y += southbridge.c
 
 romstage-y += BiosCallOuts.c
 romstage-y += i2c.c
@@ -47,10 +47,10 @@ ramstage-y += cpu.c
 ramstage-y += mca.c
 ramstage-y += enable_usbdebug.c
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += acpi.c
+ramstage-y += fch.c
 ramstage-y += fch_agesa.c
 ramstage-y += gpio.c
 ramstage-y += monotonic_timer.c
-ramstage-y += southbridge.c
 ramstage-y += northbridge.c
 ramstage-y += sata.c
 ramstage-y += memmap.c
diff --git a/src/soc/amd/stoneyridge/early_fch.c b/src/soc/amd/stoneyridge/early_fch.c
new file mode 100644
index 000000000000..1f038f61f1c2
--- /dev/null
+++ b/src/soc/amd/stoneyridge/early_fch.c
@@ -0,0 +1,173 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/lpc.h>
+#include <amdblocks/pmlib.h>
+#include <amdblocks/reset.h>
+#include <amdblocks/smbus.h>
+#include <amdblocks/spi.h>
+#include <soc/southbridge.h>
+#include <types.h>
+
+static void sb_enable_lpc(void)
+{
+	u8 byte;
+
+	/* Enable LPC controller */
+	byte = pm_io_read8(PM_LPC_GATING);
+	byte |= PM_LPC_ENABLE;
+	pm_io_write8(PM_LPC_GATING, byte);
+}
+
+static void sb_lpc_decode(void)
+{
+	u32 tmp = 0;
+
+	/* Enable I/O decode to LPC bus */
+	tmp = DECODE_ENABLE_PARALLEL_PORT0 | DECODE_ENABLE_PARALLEL_PORT2
+		| DECODE_ENABLE_PARALLEL_PORT4 | DECODE_ENABLE_SERIAL_PORT0
+		| DECODE_ENABLE_SERIAL_PORT1 | DECODE_ENABLE_SERIAL_PORT2
+		| DECODE_ENABLE_SERIAL_PORT3 | DECODE_ENABLE_SERIAL_PORT4
+		| DECODE_ENABLE_SERIAL_PORT5 | DECODE_ENABLE_SERIAL_PORT6
+		| DECODE_ENABLE_SERIAL_PORT7 | DECODE_ENABLE_AUDIO_PORT0
+		| DECODE_ENABLE_AUDIO_PORT1 | DECODE_ENABLE_AUDIO_PORT2
+		| DECODE_ENABLE_AUDIO_PORT3 | DECODE_ENABLE_MSS_PORT2
+		| DECODE_ENABLE_MSS_PORT3 | DECODE_ENABLE_FDC_PORT0
+		| DECODE_ENABLE_FDC_PORT1 | DECODE_ENABLE_GAME_PORT
+		| DECODE_ENABLE_KBC_PORT | DECODE_ENABLE_ACPIUC_PORT
+		| DECODE_ENABLE_ADLIB_PORT;
+
+	/* Decode SIOs at 2E/2F and 4E/4F */
+	if (CONFIG(STONEYRIDGE_LEGACY_FREE))
+		tmp |= DECODE_ALTERNATE_SIO_ENABLE | DECODE_SIO_ENABLE;
+
+	lpc_enable_decode(tmp);
+}
+
+static void setup_spread_spectrum(int *reboot)
+{
+	uint16_t rstcfg = pm_read16(PWR_RESET_CFG);
+
+	rstcfg &= ~TOGGLE_ALL_PWR_GOOD;
+	pm_write16(PWR_RESET_CFG, rstcfg);
+
+	uint32_t cntl1 = misc_read32(MISC_CLK_CNTL1);
+
+	if (cntl1 & CG1PLL_FBDIV_TEST) {
+		printk(BIOS_DEBUG, "Spread spectrum is ready\n");
+		misc_write32(MISC_CGPLL_CONFIG1,
+			     misc_read32(MISC_CGPLL_CONFIG1) |
+				     CG1PLL_SPREAD_SPECTRUM_ENABLE);
+
+		return;
+	}
+
+	printk(BIOS_DEBUG, "Setting up spread spectrum\n");
+
+	uint32_t cfg6 = misc_read32(MISC_CGPLL_CONFIG6);
+	cfg6 &= ~CG1PLL_LF_MODE_MASK;
+	cfg6 |= (0x0f8 << CG1PLL_LF_MODE_SHIFT) & CG1PLL_LF_MODE_MASK;
+	misc_write32(MISC_CGPLL_CONFIG6, cfg6);
+
+	uint32_t cfg3 = misc_read32(MISC_CGPLL_CONFIG3);
+	cfg3 &= ~CG1PLL_REFDIV_MASK;
+	cfg3 |= (0x003 << CG1PLL_REFDIV_SHIFT) & CG1PLL_REFDIV_MASK;
+	cfg3 &= ~CG1PLL_FBDIV_MASK;
+	cfg3 |= (0x04b << CG1PLL_FBDIV_SHIFT) & CG1PLL_FBDIV_MASK;
+	misc_write32(MISC_CGPLL_CONFIG3, cfg3);
+
+	uint32_t cfg5 = misc_read32(MISC_CGPLL_CONFIG5);
+	cfg5 &= ~SS_AMOUNT_NFRAC_SLIP_MASK;
+	cfg5 |= (0x2 << SS_AMOUNT_NFRAC_SLIP_SHIFT) & SS_AMOUNT_NFRAC_SLIP_MASK;
+	misc_write32(MISC_CGPLL_CONFIG5, cfg5);
+
+	uint32_t cfg4 = misc_read32(MISC_CGPLL_CONFIG4);
+	cfg4 &= ~SS_AMOUNT_DSFRAC_MASK;
+	cfg4 |= (0xd000 << SS_AMOUNT_DSFRAC_SHIFT) & SS_AMOUNT_DSFRAC_MASK;
+	cfg4 &= ~SS_STEP_SIZE_DSFRAC_MASK;
+	cfg4 |= (0x02d5 << SS_STEP_SIZE_DSFRAC_SHIFT)
+						& SS_STEP_SIZE_DSFRAC_MASK;
+	misc_write32(MISC_CGPLL_CONFIG4, cfg4);
+
+	rstcfg |= TOGGLE_ALL_PWR_GOOD;
+	pm_write16(PWR_RESET_CFG, rstcfg);
+
+	cntl1 |= CG1PLL_FBDIV_TEST;
+	misc_write32(MISC_CLK_CNTL1, cntl1);
+
+	*reboot = 1;
+}
+
+static void setup_misc(int *reboot)
+{
+	/* Undocumented register */
+	uint32_t reg = misc_read32(0x50);
+	if (!(reg & BIT(16))) {
+		reg |= BIT(16);
+
+		misc_write32(0x50, reg);
+		*reboot = 1;
+	}
+}
+
+/* Before console init */
+void bootblock_fch_early_init(void)
+{
+	int reboot = 0;
+
+	/* Enable_acpimmio_decode_pm04 to enable the ACPIMMIO decode which is needed to access
+	   the GPIO registers. */
+	enable_acpimmio_decode_pm04();
+	lpc_enable_rom();
+	sb_enable_lpc();
+	lpc_enable_port80();
+	sb_lpc_decode();
+	/* Make sure the base address is predictable */
+	lpc_set_spibase(SPI_BASE_ADDRESS);
+	fch_spi_early_init();
+	fch_smbus_init();
+	fch_enable_cf9_io();
+	setup_spread_spectrum(&reboot);
+	setup_misc(&reboot);
+
+	if (reboot)
+		warm_reset();
+
+	fch_enable_legacy_io();
+	enable_aoac_devices();
+
+	/* disable the keyboard reset function before mainboard GPIO setup */
+	if (CONFIG(DISABLE_KEYBOARD_RESET_PIN))
+		fch_disable_kb_rst();
+}
+
+/* After console init */
+void bootblock_fch_init(void)
+{
+	pm_set_power_failure_state();
+	fch_print_pmxc0_status();
+	show_spi_speeds_and_modes();
+}
+
+void fch_clk_output_48Mhz(u32 osc)
+{
+	u32 ctrl;
+
+	/*
+	 * Clear the disable for OSCOUT1 (signal typically named XnnM_25M_48M)
+	 * or OSCOUT2 (USBCLK/25M_48M_OSC).  The frequency defaults to 48MHz.
+	 */
+	ctrl = misc_read32(MISC_CLK_CNTL1);
+
+	switch (osc) {
+	case 1:
+		ctrl &= ~OSCOUT1_CLK_OUTPUT_ENB;
+		break;
+	case 2:
+		ctrl &= ~OSCOUT2_CLK_OUTPUT_ENB;
+		break;
+	default:
+		return; /* do nothing if invalid */
+	}
+	misc_write32(MISC_CLK_CNTL1, ctrl);
+}
diff --git a/src/soc/amd/stoneyridge/southbridge.c b/src/soc/amd/stoneyridge/fch.c
index f0442e52c10d..16802eff4cb3 100644
--- a/src/soc/amd/stoneyridge/southbridge.c
+++ b/src/soc/amd/stoneyridge/fch.c
@@ -1,6 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
-#include <amdblocks/spi.h>
 #include <console/console.h>
 #include <device/mmio.h>
 #include <bootstate.h>
@@ -12,12 +11,8 @@
 #include <acpi/acpi_gnvs.h>
 #include <amdblocks/amd_pci_util.h>
 #include <amdblocks/aoac.h>
-#include <amdblocks/reset.h>
 #include <amdblocks/acpimmio.h>
-#include <amdblocks/lpc.h>
 #include <amdblocks/acpi.h>
-#include <amdblocks/pmlib.h>
-#include <amdblocks/smbus.h>
 #include <amdblocks/smi.h>
 #include <soc/southbridge.h>
 #include <soc/smi.h>
@@ -26,7 +21,6 @@
 #include <agesa_headers.h>
 #include <soc/acpi.h>
 #include <soc/aoac_defs.h>
-#include <soc/lpc.h>
 #include <soc/nvs.h>
 #include <types.h>
 
@@ -80,169 +74,6 @@ const struct irq_idx_name *sb_get_apic_reg_association(size_t *size)
 	return irq_association;
 }
 
-static void sb_enable_lpc(void)
-{
-	u8 byte;
-
-	/* Enable LPC controller */
-	byte = pm_io_read8(PM_LPC_GATING);
-	byte |= PM_LPC_ENABLE;
-	pm_io_write8(PM_LPC_GATING, byte);
-}
-
-static void sb_lpc_decode(void)
-{
-	u32 tmp = 0;
-
-	/* Enable I/O decode to LPC bus */
-	tmp = DECODE_ENABLE_PARALLEL_PORT0 | DECODE_ENABLE_PARALLEL_PORT2
-		| DECODE_ENABLE_PARALLEL_PORT4 | DECODE_ENABLE_SERIAL_PORT0
-		| DECODE_ENABLE_SERIAL_PORT1 | DECODE_ENABLE_SERIAL_PORT2
-		| DECODE_ENABLE_SERIAL_PORT3 | DECODE_ENABLE_SERIAL_PORT4
-		| DECODE_ENABLE_SERIAL_PORT5 | DECODE_ENABLE_SERIAL_PORT6
-		| DECODE_ENABLE_SERIAL_PORT7 | DECODE_ENABLE_AUDIO_PORT0
-		| DECODE_ENABLE_AUDIO_PORT1 | DECODE_ENABLE_AUDIO_PORT2
-		| DECODE_ENABLE_AUDIO_PORT3 | DECODE_ENABLE_MSS_PORT2
-		| DECODE_ENABLE_MSS_PORT3 | DECODE_ENABLE_FDC_PORT0
-		| DECODE_ENABLE_FDC_PORT1 | DECODE_ENABLE_GAME_PORT
-		| DECODE_ENABLE_KBC_PORT | DECODE_ENABLE_ACPIUC_PORT
-		| DECODE_ENABLE_ADLIB_PORT;
-
-	/* Decode SIOs at 2E/2F and 4E/4F */
-	if (CONFIG(STONEYRIDGE_LEGACY_FREE))
-		tmp |= DECODE_ALTERNATE_SIO_ENABLE | DECODE_SIO_ENABLE;
-
-	lpc_enable_decode(tmp);
-}
-
-void fch_clk_output_48Mhz(u32 osc)
-{
-	u32 ctrl;
-
-	/*
-	 * Clear the disable for OSCOUT1 (signal typically named XnnM_25M_48M)
-	 * or OSCOUT2 (USBCLK/25M_48M_OSC).  The frequency defaults to 48MHz.
-	 */
-	ctrl = misc_read32(MISC_CLK_CNTL1);
-
-	switch (osc) {
-	case 1:
-		ctrl &= ~OSCOUT1_CLK_OUTPUT_ENB;
-		break;
-	case 2:
-		ctrl &= ~OSCOUT2_CLK_OUTPUT_ENB;
-		break;
-	default:
-		return; /* do nothing if invalid */
-	}
-	misc_write32(MISC_CLK_CNTL1, ctrl);
-}
-
-static void setup_spread_spectrum(int *reboot)
-{
-	uint16_t rstcfg = pm_read16(PWR_RESET_CFG);
-
-	rstcfg &= ~TOGGLE_ALL_PWR_GOOD;
-	pm_write16(PWR_RESET_CFG, rstcfg);
-
-	uint32_t cntl1 = misc_read32(MISC_CLK_CNTL1);
-
-	if (cntl1 & CG1PLL_FBDIV_TEST) {
-		printk(BIOS_DEBUG, "Spread spectrum is ready\n");
-		misc_write32(MISC_CGPLL_CONFIG1,
-			     misc_read32(MISC_CGPLL_CONFIG1) |
-				     CG1PLL_SPREAD_SPECTRUM_ENABLE);
-
-		return;
-	}
-
-	printk(BIOS_DEBUG, "Setting up spread spectrum\n");
-
-	uint32_t cfg6 = misc_read32(MISC_CGPLL_CONFIG6);
-	cfg6 &= ~CG1PLL_LF_MODE_MASK;
-	cfg6 |= (0x0f8 << CG1PLL_LF_MODE_SHIFT) & CG1PLL_LF_MODE_MASK;
-	misc_write32(MISC_CGPLL_CONFIG6, cfg6);
-
-	uint32_t cfg3 = misc_read32(MISC_CGPLL_CONFIG3);
-	cfg3 &= ~CG1PLL_REFDIV_MASK;
-	cfg3 |= (0x003 << CG1PLL_REFDIV_SHIFT) & CG1PLL_REFDIV_MASK;
-	cfg3 &= ~CG1PLL_FBDIV_MASK;
-	cfg3 |= (0x04b << CG1PLL_FBDIV_SHIFT) & CG1PLL_FBDIV_MASK;
-	misc_write32(MISC_CGPLL_CONFIG3, cfg3);
-
-	uint32_t cfg5 = misc_read32(MISC_CGPLL_CONFIG5);
-	cfg5 &= ~SS_AMOUNT_NFRAC_SLIP_MASK;
-	cfg5 |= (0x2 << SS_AMOUNT_NFRAC_SLIP_SHIFT) & SS_AMOUNT_NFRAC_SLIP_MASK;
-	misc_write32(MISC_CGPLL_CONFIG5, cfg5);
-
-	uint32_t cfg4 = misc_read32(MISC_CGPLL_CONFIG4);
-	cfg4 &= ~SS_AMOUNT_DSFRAC_MASK;
-	cfg4 |= (0xd000 << SS_AMOUNT_DSFRAC_SHIFT) & SS_AMOUNT_DSFRAC_MASK;
-	cfg4 &= ~SS_STEP_SIZE_DSFRAC_MASK;
-	cfg4 |= (0x02d5 << SS_STEP_SIZE_DSFRAC_SHIFT)
-						& SS_STEP_SIZE_DSFRAC_MASK;
-	misc_write32(MISC_CGPLL_CONFIG4, cfg4);
-
-	rstcfg |= TOGGLE_ALL_PWR_GOOD;
-	pm_write16(PWR_RESET_CFG, rstcfg);
-
-	cntl1 |= CG1PLL_FBDIV_TEST;
-	misc_write32(MISC_CLK_CNTL1, cntl1);
-
-	*reboot = 1;
-}
-
-static void setup_misc(int *reboot)
-{
-	/* Undocumented register */
-	uint32_t reg = misc_read32(0x50);
-	if (!(reg & BIT(16))) {
-		reg |= BIT(16);
-
-		misc_write32(0x50, reg);
-		*reboot = 1;
-	}
-}
-
-/* Before console init */
-void bootblock_fch_early_init(void)
-{
-	int reboot = 0;
-
-	/* Enable_acpimmio_decode_pm04 to enable the ACPIMMIO decode which is needed to access
-	   the GPIO registers. */
-	enable_acpimmio_decode_pm04();
-	lpc_enable_rom();
-	sb_enable_lpc();
-	lpc_enable_port80();
-	sb_lpc_decode();
-	/* Make sure the base address is predictable */
-	lpc_set_spibase(SPI_BASE_ADDRESS);
-	fch_spi_early_init();
-	fch_smbus_init();
-	fch_enable_cf9_io();
-	setup_spread_spectrum(&reboot);
-	setup_misc(&reboot);
-
-	if (reboot)
-		warm_reset();
-
-	fch_enable_legacy_io();
-	enable_aoac_devices();
-
-	/* disable the keyboard reset function before mainboard GPIO setup */
-	if (CONFIG(DISABLE_KEYBOARD_RESET_PIN))
-		fch_disable_kb_rst();
-}
-
-/* After console init */
-void bootblock_fch_init(void)
-{
-	pm_set_power_failure_state();
-	fch_print_pmxc0_status();
-	show_spi_speeds_and_modes();
-}
-
 static void fch_init_acpi_ports(void)
 {
 	u32 reg;