blob: 302c9299ee0dfb67de414431ba3683be558b3db8 [file] [log] [blame]
Simon Glass1ff4f322016-01-18 20:19:18 -07001/*
2 * Copyright (C) 2014 Google, Inc
3 *
4 * SPDX-License-Identifier: GPL-2.0+
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <pch.h>
10
Bin Mengec2af6f2016-02-01 01:40:44 -080011#define GPIO_BASE 0x44
Simon Glass1ff4f322016-01-18 20:19:18 -070012#define BIOS_CTRL 0xd8
13
Bin Meng3e389d82016-02-01 01:40:42 -080014static int pch7_get_spi_base(struct udevice *dev, ulong *sbasep)
Simon Glass1ff4f322016-01-18 20:19:18 -070015{
16 u32 rcba;
17
18 dm_pci_read_config32(dev, PCH_RCBA, &rcba);
19 /* Bits 31-14 are the base address, 13-1 are reserved, 0 is enable */
20 rcba = rcba & 0xffffc000;
21 *sbasep = rcba + 0x3020;
22
23 return 0;
24}
25
Simon Glass1ff4f322016-01-18 20:19:18 -070026static int pch7_set_spi_protect(struct udevice *dev, bool protect)
27{
28 uint8_t bios_cntl;
29
30 /* Adjust the BIOS write protect to dis/allow write commands */
31 dm_pci_read_config8(dev, BIOS_CTRL, &bios_cntl);
32 if (protect)
33 bios_cntl &= ~BIOS_CTRL_BIOSWE;
34 else
35 bios_cntl |= BIOS_CTRL_BIOSWE;
36 dm_pci_write_config8(dev, BIOS_CTRL, bios_cntl);
37
38 return 0;
39}
40
Bin Mengec2af6f2016-02-01 01:40:44 -080041static int pch7_get_gpio_base(struct udevice *dev, u32 *gbasep)
42{
43 u32 base;
44
45 /*
46 * GPIO_BASE moved to its current offset with ICH6, but prior to
47 * that it was unused (or undocumented). Check that it looks
48 * okay: not all ones or zeros.
49 *
50 * Note we don't need check bit0 here, because the Tunnel Creek
51 * GPIO base address register bit0 is reserved (read returns 0),
52 * while on the Ivybridge the bit0 is used to indicate it is an
53 * I/O space.
54 */
55 dm_pci_read_config32(dev, GPIO_BASE, &base);
56 if (base == 0x00000000 || base == 0xffffffff) {
57 debug("%s: unexpected BASE value\n", __func__);
58 return -ENODEV;
59 }
60
61 /*
62 * Okay, I guess we're looking at the right device. The actual
63 * GPIO registers are in the PCI device's I/O space, starting
64 * at the offset that we just read. Bit 0 indicates that it's
65 * an I/O address, not a memory address, so mask that off.
66 */
67 *gbasep = base & 1 ? base & ~3 : base & ~15;
68
69 return 0;
70}
71
Simon Glass1ff4f322016-01-18 20:19:18 -070072static const struct pch_ops pch7_ops = {
Bin Meng3e389d82016-02-01 01:40:42 -080073 .get_spi_base = pch7_get_spi_base,
Simon Glass1ff4f322016-01-18 20:19:18 -070074 .set_spi_protect = pch7_set_spi_protect,
Bin Mengec2af6f2016-02-01 01:40:44 -080075 .get_gpio_base = pch7_get_gpio_base,
Simon Glass1ff4f322016-01-18 20:19:18 -070076};
77
78static const struct udevice_id pch7_ids[] = {
79 { .compatible = "intel,pch7" },
80 { }
81};
82
83U_BOOT_DRIVER(pch7_drv) = {
84 .name = "intel-pch7",
85 .id = UCLASS_PCH,
86 .of_match = pch7_ids,
87 .ops = &pch7_ops,
88};