1*08cb7420SSimon Glass /*
2*08cb7420SSimon Glass * Copyright (c) 2016 Google, Inc
3*08cb7420SSimon Glass *
4*08cb7420SSimon Glass * From coreboot broadwell support
5*08cb7420SSimon Glass *
6*08cb7420SSimon Glass * SPDX-License-Identifier: GPL-2.0
7*08cb7420SSimon Glass */
8*08cb7420SSimon Glass
9*08cb7420SSimon Glass #include <common.h>
10*08cb7420SSimon Glass #include <dm.h>
11*08cb7420SSimon Glass #include <pch.h>
12*08cb7420SSimon Glass #include <asm/intel_regs.h>
13*08cb7420SSimon Glass #include <asm/io.h>
14*08cb7420SSimon Glass #include <asm/lpc_common.h>
15*08cb7420SSimon Glass #include <asm/arch/pch.h>
16*08cb7420SSimon Glass #include <asm/arch/spi.h>
17*08cb7420SSimon Glass
set_spi_speed(void)18*08cb7420SSimon Glass static void set_spi_speed(void)
19*08cb7420SSimon Glass {
20*08cb7420SSimon Glass u32 fdod;
21*08cb7420SSimon Glass u8 ssfc;
22*08cb7420SSimon Glass
23*08cb7420SSimon Glass /* Observe SPI Descriptor Component Section 0 */
24*08cb7420SSimon Glass writel(0x1000, SPI_REG(SPIBAR_FDOC));
25*08cb7420SSimon Glass
26*08cb7420SSimon Glass /* Extract the Write/Erase SPI Frequency from descriptor */
27*08cb7420SSimon Glass fdod = readl(SPI_REG(SPIBAR_FDOD));
28*08cb7420SSimon Glass fdod >>= 24;
29*08cb7420SSimon Glass fdod &= 7;
30*08cb7420SSimon Glass
31*08cb7420SSimon Glass /* Set Software Sequence frequency to match */
32*08cb7420SSimon Glass ssfc = readb(SPI_REG(SPIBAR_SSFC + 2));
33*08cb7420SSimon Glass ssfc &= ~7;
34*08cb7420SSimon Glass ssfc |= fdod;
35*08cb7420SSimon Glass writeb(ssfc, SPI_REG(SPIBAR_SSFC + 2));
36*08cb7420SSimon Glass }
37*08cb7420SSimon Glass
broadwell_lpc_early_init(struct udevice * dev)38*08cb7420SSimon Glass static int broadwell_lpc_early_init(struct udevice *dev)
39*08cb7420SSimon Glass {
40*08cb7420SSimon Glass set_spi_speed();
41*08cb7420SSimon Glass
42*08cb7420SSimon Glass return 0;
43*08cb7420SSimon Glass }
44*08cb7420SSimon Glass
lpc_init_extra(struct udevice * dev)45*08cb7420SSimon Glass static int lpc_init_extra(struct udevice *dev)
46*08cb7420SSimon Glass {
47*08cb7420SSimon Glass return 0;
48*08cb7420SSimon Glass }
49*08cb7420SSimon Glass
broadwell_lpc_probe(struct udevice * dev)50*08cb7420SSimon Glass static int broadwell_lpc_probe(struct udevice *dev)
51*08cb7420SSimon Glass {
52*08cb7420SSimon Glass int ret;
53*08cb7420SSimon Glass
54*08cb7420SSimon Glass if (!(gd->flags & GD_FLG_RELOC)) {
55*08cb7420SSimon Glass ret = lpc_common_early_init(dev);
56*08cb7420SSimon Glass if (ret) {
57*08cb7420SSimon Glass debug("%s: lpc_early_init() failed\n", __func__);
58*08cb7420SSimon Glass return ret;
59*08cb7420SSimon Glass }
60*08cb7420SSimon Glass
61*08cb7420SSimon Glass return broadwell_lpc_early_init(dev);
62*08cb7420SSimon Glass }
63*08cb7420SSimon Glass
64*08cb7420SSimon Glass return lpc_init_extra(dev);
65*08cb7420SSimon Glass }
66*08cb7420SSimon Glass
67*08cb7420SSimon Glass static const struct udevice_id broadwell_lpc_ids[] = {
68*08cb7420SSimon Glass { .compatible = "intel,broadwell-lpc" },
69*08cb7420SSimon Glass { }
70*08cb7420SSimon Glass };
71*08cb7420SSimon Glass
72*08cb7420SSimon Glass U_BOOT_DRIVER(broadwell_lpc_drv) = {
73*08cb7420SSimon Glass .name = "lpc",
74*08cb7420SSimon Glass .id = UCLASS_LPC,
75*08cb7420SSimon Glass .of_match = broadwell_lpc_ids,
76*08cb7420SSimon Glass .probe = broadwell_lpc_probe,
77*08cb7420SSimon Glass };
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