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https://github.com/AsahiLinux/u-boot
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88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014 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 <log.h>
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#include <pch.h>
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#define GPIO_BASE 0x44
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#define BIOS_CTRL 0xd8
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static int pch7_get_spi_base(struct udevice *dev, ulong *sbasep)
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{
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u32 rcba;
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dm_pci_read_config32(dev, PCH_RCBA, &rcba);
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/* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable */
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rcba = rcba & 0xffffc000;
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*sbasep = rcba + 0x3020;
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return 0;
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}
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static int pch7_set_spi_protect(struct udevice *dev, bool protect)
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{
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uint8_t bios_cntl;
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/* Adjust the BIOS write protect to dis/allow write commands */
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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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else
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bios_cntl |= BIOS_CTRL_BIOSWE;
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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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static int pch7_get_gpio_base(struct udevice *dev, u32 *gbasep)
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{
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u32 base;
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/*
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* GPIO_BASE moved to its current offset with ICH6, but prior to
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* that it was unused (or undocumented). Check that it looks
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* okay: not all ones or zeros.
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*
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* Note we don't need check bit0 here, because the Tunnel Creek
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* GPIO base address register bit0 is reserved (read returns 0),
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* while on the Ivybridge the bit0 is used to indicate it is an
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* I/O space.
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*/
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dm_pci_read_config32(dev, GPIO_BASE, &base);
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if (base == 0x00000000 || base == 0xffffffff) {
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debug("%s: unexpected BASE value\n", __func__);
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return -ENODEV;
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}
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/*
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* Okay, I guess we're looking at the right device. The actual
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* GPIO registers are in the PCI device's I/O space, starting
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* at the offset that we just read. Bit 0 indicates that it's
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* an I/O address, not a memory address, so mask that off.
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*/
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*gbasep = base & 1 ? base & ~3 : base & ~15;
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return 0;
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}
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static const struct pch_ops pch7_ops = {
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.get_spi_base = pch7_get_spi_base,
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.set_spi_protect = pch7_set_spi_protect,
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.get_gpio_base = pch7_get_gpio_base,
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};
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static const struct udevice_id pch7_ids[] = {
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{ .compatible = "intel,pch7" },
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{ }
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};
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U_BOOT_DRIVER(pch7_drv) = {
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.name = "intel-pch7",
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.id = UCLASS_PCH,
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.of_match = pch7_ids,
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.ops = &pch7_ops,
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};
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