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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2014 Google, Inc
*/
#include <dm.h>
#include <log.h>
#include <pch.h>
#define GPIO_BASE 0x44
#define BIOS_CTRL 0xd8
static int pch7_get_spi_base(struct udevice *dev, ulong *sbasep)
{
u32 rcba;
dm_pci_read_config32(dev, PCH_RCBA, &rcba);
/* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable */
rcba = rcba & 0xffffc000;
*sbasep = rcba + 0x3020;
return 0;
}
static int pch7_set_spi_protect(struct udevice *dev, bool protect)
{
uint8_t bios_cntl;
/* Adjust the BIOS write protect to dis/allow write commands */
dm_pci_read_config8(dev, BIOS_CTRL, &bios_cntl);
if (protect)
bios_cntl &= ~BIOS_CTRL_BIOSWE;
else
bios_cntl |= BIOS_CTRL_BIOSWE;
dm_pci_write_config8(dev, BIOS_CTRL, bios_cntl);
return 0;
}
static int pch7_get_gpio_base(struct udevice *dev, u32 *gbasep)
{
u32 base;
/*
* GPIO_BASE moved to its current offset with ICH6, but prior to
* that it was unused (or undocumented). Check that it looks
* okay: not all ones or zeros.
*
* Note we don't need check bit0 here, because the Tunnel Creek
* GPIO base address register bit0 is reserved (read returns 0),
* while on the Ivybridge the bit0 is used to indicate it is an
* I/O space.
*/
dm_pci_read_config32(dev, GPIO_BASE, &base);
if (base == 0x00000000 || base == 0xffffffff) {
debug("%s: unexpected BASE value\n", __func__);
return -ENODEV;
}
/*
* Okay, I guess we're looking at the right device. The actual
* GPIO registers are in the PCI device's I/O space, starting
* at the offset that we just read. Bit 0 indicates that it's
* an I/O address, not a memory address, so mask that off.
*/
*gbasep = base & 1 ? base & ~3 : base & ~15;
return 0;
}
static const struct pch_ops pch7_ops = {
.get_spi_base = pch7_get_spi_base,
.set_spi_protect = pch7_set_spi_protect,
.get_gpio_base = pch7_get_gpio_base,
};
static const struct udevice_id pch7_ids[] = {
{ .compatible = "intel,pch7" },
{ }
};
U_BOOT_DRIVER(pch7_drv) = {
.name = "intel-pch7",
.id = UCLASS_PCH,
.of_match = pch7_ids,
.ops = &pch7_ops,
};
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