| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <arch/bootblock.h> |
| #include <device/pci_ops.h> |
| #include "pch.h" |
| |
| /* |
| * Enable Prefetching and Caching. |
| */ |
| static void enable_spi_prefetch(void) |
| { |
| u8 reg8; |
| pci_devfn_t dev = PCH_LPC_DEV; |
| |
| reg8 = pci_read_config8(dev, BIOS_CNTL); |
| reg8 &= ~(3 << 2); |
| reg8 |= (2 << 2); /* Prefetching and Caching Enabled */ |
| pci_write_config8(dev, BIOS_CNTL, reg8); |
| } |
| |
| static void enable_port80_on_lpc(void) |
| { |
| /* Enable port 80 POST on LPC */ |
| RCBA32(GCS) &= (~0x04); |
| } |
| |
| static void set_spi_speed(void) |
| { |
| u32 fdod; |
| u8 ssfc; |
| |
| /* Observe SPI Descriptor Component Section 0 */ |
| RCBA32(0x38b0) = 0x1000; |
| |
| /* Extract the Write/Erase SPI Frequency from descriptor */ |
| fdod = RCBA32(0x38b4); |
| fdod >>= 24; |
| fdod &= 7; |
| |
| /* Set Software Sequence frequency to match */ |
| ssfc = RCBA8(0x3893); |
| ssfc &= ~7; |
| ssfc |= fdod; |
| RCBA8(0x3893) = ssfc; |
| } |
| |
| void bootblock_early_southbridge_init(void) |
| { |
| enable_spi_prefetch(); |
| |
| early_pch_init(); |
| |
| enable_port80_on_lpc(); |
| set_spi_speed(); |
| |
| /* Enable upper 128bytes of CMOS */ |
| RCBA32(RC) = (1 << 2); |
| } |