diff options
| author | Simon Glass | 2014-11-12 22:42:15 -0700 |
|---|---|---|
| committer | Simon Glass | 2014-11-21 07:34:12 +0100 |
| commit | 2b6051541b562b72d2cf784376a84552da18318d (patch) | |
| tree | c21b6ae92539eb63628f15b52044dd164471aed7 /arch/x86/include/asm/arch-ivybridge | |
| parent | 6fb3b72e8745073465b4a5875b7750cc43cbd1af (diff) | |
x86: ivybridge: Add early LPC init so that serial works
The PCH (Platform Controller Hub) includes an LPC (Low Pin Count) device
which provides a serial port. This is accessible on Chromebooks, so enable
it early in the boot process.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch/x86/include/asm/arch-ivybridge')
| -rw-r--r-- | arch/x86/include/asm/arch-ivybridge/pch.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/arch/x86/include/asm/arch-ivybridge/pch.h b/arch/x86/include/asm/arch-ivybridge/pch.h new file mode 100644 index 00000000000..26ddeab729c --- /dev/null +++ b/arch/x86/include/asm/arch-ivybridge/pch.h @@ -0,0 +1,48 @@ +/* + * Copyright (c) 2014 Google, Inc + * + * From Coreboot src/southbridge/intel/bd82x6x/pch.h + * + * Copyright (C) 2008-2009 coresystems GmbH + * Copyright (C) 2012 The Chromium OS Authors. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#ifndef _ASM_ARCH_PCH_H +#define _ASM_ARCH_PCH_H + +#include <pci.h> + +/* PCI Configuration Space (D31:F0): LPC */ +#define PCH_LPC_DEV PCI_BDF(0, 0x1f, 0) + +#define LPC_IO_DEC 0x80 /* IO Decode Ranges Register */ +#define LPC_EN 0x82 /* LPC IF Enables Register */ +#define CNF2_LPC_EN (1 << 13) /* 0x4e/0x4f */ +#define CNF1_LPC_EN (1 << 12) /* 0x2e/0x2f */ +#define MC_LPC_EN (1 << 11) /* 0x62/0x66 */ +#define KBC_LPC_EN (1 << 10) /* 0x60/0x64 */ +#define GAMEH_LPC_EN (1 << 9) /* 0x208/0x20f */ +#define GAMEL_LPC_EN (1 << 8) /* 0x200/0x207 */ +#define FDD_LPC_EN (1 << 3) /* LPC_IO_DEC[12] */ +#define LPT_LPC_EN (1 << 2) /* LPC_IO_DEC[9:8] */ +#define COMB_LPC_EN (1 << 1) /* LPC_IO_DEC[6:4] */ +#define COMA_LPC_EN (1 << 0) /* LPC_IO_DEC[3:2] */ +#define LPC_GEN1_DEC 0x84 /* LPC IF Generic Decode Range 1 */ +#define LPC_GEN2_DEC 0x88 /* LPC IF Generic Decode Range 2 */ +#define LPC_GEN3_DEC 0x8c /* LPC IF Generic Decode Range 3 */ +#define LPC_GEN4_DEC 0x90 /* LPC IF Generic Decode Range 4 */ +#define LPC_GENX_DEC(x) (0x84 + 4 * (x)) + +/** + * lpc_early_init() - set up LPC serial ports and other early things + * + * @blob: Device tree blob + * @node: Offset of LPC node + * @dev: PCH PCI device containing the LPC + * @return 0 if OK, -ve on error + */ +int lpc_early_init(const void *blob, int node, pci_dev_t dev); + +#endif |