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