100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2016 Google, Inc
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <pch.h>
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#include <pci.h>
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#include <asm/intel_regs.h>
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#include <asm/io.h>
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#include <asm/lpc_common.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* Enable Prefetching and Caching */
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static void enable_spi_prefetch(struct udevice *pch)
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{
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u8 reg8;
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dm_pci_read_config8(pch, 0xdc, ®8);
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reg8 &= ~(3 << 2);
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reg8 |= (2 << 2); /* Prefetching and Caching Enabled */
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dm_pci_write_config8(pch, 0xdc, reg8);
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}
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static void enable_port80_on_lpc(struct udevice *pch)
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{
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/* Enable port 80 POST on LPC */
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dm_pci_write_config32(pch, PCH_RCBA_BASE, RCB_BASE_ADDRESS | 1);
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clrbits_le32(RCB_REG(GCS), 4);
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}
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/**
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* lpc_early_init() - set up LPC serial ports and other early things
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*
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* @dev: LPC device
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* @return 0 if OK, -ve on error
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*/
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int lpc_common_early_init(struct udevice *dev)
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{
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struct udevice *pch = dev->parent;
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struct reg_info {
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u32 base;
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u32 size;
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} values[4], *ptr;
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int count;
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int i;
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count = fdtdec_get_int_array_count(gd->fdt_blob, dev_of_offset(dev),
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"intel,gen-dec", (u32 *)values,
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sizeof(values) / sizeof(u32));
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if (count < 0)
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return -EINVAL;
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/* Set COM1/COM2 decode range */
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dm_pci_write_config16(pch, LPC_IO_DEC, 0x0010);
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/* Enable PS/2 Keyboard/Mouse, EC areas and COM1 */
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dm_pci_write_config16(pch, LPC_EN, KBC_LPC_EN | MC_LPC_EN |
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GAMEL_LPC_EN | COMA_LPC_EN);
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/* Write all registers but use 0 if we run out of data */
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count = count * sizeof(u32) / sizeof(values[0]);
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for (i = 0, ptr = values; i < ARRAY_SIZE(values); i++, ptr++) {
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u32 reg = 0;
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if (i < count)
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reg = ptr->base | PCI_COMMAND_IO | (ptr->size << 16);
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dm_pci_write_config32(pch, LPC_GENX_DEC(i), reg);
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}
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enable_spi_prefetch(pch);
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/* This is already done in start.S, but let's do it in C */
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enable_port80_on_lpc(pch);
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return 0;
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}
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int lpc_set_spi_protect(struct udevice *dev, int bios_ctrl, bool protect)
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{
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uint8_t bios_cntl;
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/* Adjust the BIOS write protect and SMM BIOS Write Protect Disable */
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dm_pci_read_config8(dev, bios_ctrl, &bios_cntl);
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if (protect) {
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bios_cntl &= ~BIOS_CTRL_BIOSWE;
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bios_cntl |= BIT(5);
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} else {
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bios_cntl |= BIOS_CTRL_BIOSWE;
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bios_cntl &= ~BIT(5);
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}
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dm_pci_write_config8(dev, bios_ctrl, bios_cntl);
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return 0;
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}
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