| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <amdblocks/acpimmio.h> |
| #include <arch/bootblock.h> |
| #include <device/pci_ops.h> |
| |
| static void enable_rom(void) |
| { |
| u16 word; |
| u32 dword; |
| const pci_devfn_t dev = PCI_DEV(0, 0x14, 0x03); |
| /* SB800 LPC Bridge 0:20:3:44h. |
| * BIT6: Port Enable for serial port 0x3f8-0x3ff |
| * BIT29: Port Enable for KBC port 0x60 and 0x64 |
| * BIT30: Port Enable for ACPI Micro-Controller port 0x66 and 0x62 |
| */ |
| dword = pci_s_read_config32(dev, 0x44); |
| //dword |= (1<<6) | (1<<29) | (1<<30); |
| /* Turn on all of LPC IO Port decode enable */ |
| dword = 0xffffffff; |
| pci_s_write_config32(dev, 0x44, dword); |
| |
| /* SB800 LPC Bridge 0:20:3:48h. |
| * BIT0: Port Enable for SuperIO 0x2E-0x2F |
| * BIT1: Port Enable for SuperIO 0x4E-0x4F |
| * BIT4: Port Enable for LPC ROM Address Arrage2 (0x68-0x6C) |
| * BIT6: Port Enable for RTC IO 0x70-0x73 |
| * BIT21: Port Enable for Port 0x80 |
| */ |
| dword = pci_s_read_config32(dev, 0x48); |
| dword |= (1 << 0) | (1 << 1) | (1 << 4) | (1 << 6) | (1 << 21); |
| pci_s_write_config32(dev, 0x48, dword); |
| |
| /* Enable ROM access */ |
| word = pci_s_read_config16(dev, 0x6c); |
| word = 0x10000 - (CONFIG_COREBOOT_ROMSIZE_KB >> 6); |
| pci_s_write_config16(dev, 0x6c, word); |
| } |
| |
| static void enable_prefetch(void) |
| { |
| u32 dword; |
| const pci_devfn_t dev = PCI_DEV(0, 0x14, 0x03); |
| |
| /* Enable PrefetchEnSPIFromHost */ |
| dword = pci_s_read_config32(dev, 0xb8); |
| pci_s_write_config32(dev, 0xb8, dword | (1 << 24)); |
| } |
| |
| static void enable_spi_fast_mode(void) |
| { |
| u32 dword; |
| const pci_devfn_t dev = PCI_DEV(0, 0x14, 0x03); |
| |
| // set temp MMIO base |
| volatile u32 *spi_base = (void *)0xa0000000; |
| u32 save = pci_s_read_config32(dev, 0xa0); |
| pci_s_write_config32(dev, 0xa0, (u32) spi_base | 2); |
| |
| // early enable of SPI 33 MHz fast mode read |
| dword = spi_base[3]; |
| spi_base[3] = (dword & ~(3 << 14)) | (1 << 14); |
| spi_base[0] = spi_base[0] | (1 << 18); // fast read enable |
| |
| pci_s_write_config32(dev, 0xa0, save); |
| } |
| |
| static void enable_clocks(void) |
| { |
| u32 reg32; |
| |
| // Program SB800 MiscClkCntrl register to configure clock output on the |
| // 14M_25M_48M_OSC ball usually used for the Super-I/O. |
| // Almost all SIOs need 48 MHz, only the SMSC SCH311x wants 14 MHz, |
| // which is the SB800's power up default. We could switch back to 14 |
| // in the mainboard's romstage.c, but then the clock frequency would |
| // change twice. |
| reg32 = misc_read32(0x40); |
| reg32 &= ~((1 << 2) | (3 << 0)); // enable, 14 MHz (power up default) |
| #if !CONFIG(SUPERIO_WANTS_14MHZ_CLOCK) |
| reg32 |= 2 << 0; // Device_CLK1_sel = 48 MHz |
| #endif |
| misc_write32(0x40, reg32); |
| } |
| |
| void bootblock_early_southbridge_init(void) |
| { |
| /* Setup the ROM access for 2M */ |
| enable_rom(); |
| enable_prefetch(); |
| enable_spi_fast_mode(); |
| |
| // Program AcpiMmioEn to enable MMIO access to MiscCntrl register |
| enable_acpimmio_decode_pm24(); |
| enable_clocks(); |
| } |