src/southbridge/amd/pi/hudson/bootblock.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <stdint.h>
#include <arch/bootblock.h>
#include <amdblocks/acpimmio.h>
#include <device/pci_ops.h>
#include <southbridge/amd/pi/hudson/hudson.h>

/*
 * Enable 4MB (LPC) ROM access at 0xFFC00000 - 0xFFFFFFFF.
 *
 * Hardware should enable LPC ROM by pin straps. This function does not
 * handle the theoretically possible PCI ROM, FWH, or SPI ROM configurations.
 *
 * The HUDSON power-on default is to map 512K ROM space.
 *
 */
static void hudson_enable_rom(void)
{
	u8 reg8;
	const pci_devfn_t dev = PCI_DEV(0, 0x14, 3);

	/* Decode variable LPC ROM address ranges 1 and 2. */
	reg8 = pci_s_read_config8(dev, 0x48);
	reg8 |= (1 << 3) | (1 << 4);
	pci_s_write_config8(dev, 0x48, reg8);

	/* LPC ROM address range 1: */
	/* Enable LPC ROM range mirroring start at 0x000e(0000). */
	pci_s_write_config16(dev, 0x68, 0x000e);
	/* Enable LPC ROM range mirroring end at 0x000f(ffff). */
	pci_s_write_config16(dev, 0x6a, 0x000f);

	/* LPC ROM address range 2: */
	/*
	 * Enable LPC ROM range start at:
	 * 0xfff8(0000): 512KB
	 * 0xfff0(0000): 1MB
	 * 0xffe0(0000): 2MB
	 * 0xffc0(0000): 4MB
	 */
	pci_s_write_config16(dev, 0x6c, 0x10000 - (CONFIG_COREBOOT_ROMSIZE_KB >> 6));
	/* Enable LPC ROM range end at 0xffff(ffff). */
	pci_s_write_config16(dev, 0x6e, 0xffff);
}

void bootblock_early_southbridge_init(void)
{
	u32 data;

	hudson_enable_rom();
	if (CONFIG(SOUTHBRIDGE_AMD_PI_BOLTON))
		enable_acpimmio_decode_pm24();
	else
		enable_acpimmio_decode_pm04();
	hudson_lpc_decode();

	if (CONFIG(POST_DEVICE_PCI_PCIE))
		hudson_pci_port80();
	else if (CONFIG(POST_DEVICE_LPC))
		hudson_lpc_port80();

	const pci_devfn_t dev = PCI_DEV(0, 0x14, 3);
	data = pci_read_config32(dev, LPC_IO_OR_MEM_DECODE_ENABLE);
	/* enable 0x2e/0x4e IO decoding for SuperIO */
	pci_write_config32(dev, LPC_IO_OR_MEM_DECODE_ENABLE, data | 3);

	/*
	 * Enable FCH to decode TPM associated Memory and IO regions for vboot
	 *
	 * Enable decoding of TPM cycles defined in TPM 1.2 spec
	 * Enable decoding of legacy TPM addresses: IO addresses 0x7f-
	 * 0x7e and 0xef-0xee.
	 */

	data = pci_read_config32(dev, LPC_TRUSTED_PLATFORM_MODULE);
	data |= TPM_12_EN | TPM_LEGACY_EN;
	pci_write_config32(dev, LPC_TRUSTED_PLATFORM_MODULE, data);

	/*
	 *  In Hudson RRG, PMIOxD2[5:4] is "Drive strength control for
	 *  LpcClk[1:0]".  This following register setting has been
	 *  replicated in every reference design since Parmer, so it is
	 *  believed to be required even though it is not documented in
	 *  the SoC BKDGs.  Without this setting, there is no serial
	 *  output.
	 */
	pm_write8(0xd2, 0);
}