diff options
| author | Arthur Heymans <arthur@aheymans.xyz> | 2017-03-01 20:10:55 +0100 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2017-09-06 04:38:55 +0000 |
| commit | 3397aa1fd469335e99befec2fbf93d505f58d70c (patch) | |
| tree | 3d9d00283599c8db2372112ce2e6f011dd307512 | |
| parent | 57443690254d86558c38682f65e85ae69e3148bc (diff) | |
device/dram/ddr2: Add a function to normalize tCLK
Also make most significant bit function accessible outside the scope
of this file.
Change-Id: I3ab39d38a243edddfde8f70ebd23f79ff774e90e
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/18320
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
| -rw-r--r-- | src/device/dram/ddr2.c | 33 | ||||
| -rw-r--r-- | src/include/device/dram/ddr2.h | 3 |
2 files changed, 28 insertions, 8 deletions
diff --git a/src/device/dram/ddr2.c b/src/device/dram/ddr2.c index 249399ff14..326b1410fa 100644 --- a/src/device/dram/ddr2.c +++ b/src/device/dram/ddr2.c @@ -2,6 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org> + * Copyright (C) 2017 Arthur Heymans <arthur@aheymans.xyz> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -23,6 +24,7 @@ #include <console/console.h> #include <device/device.h> #include <device/dram/ddr2.h> +#include <lib.h> #include <string.h> /*============================================================================== @@ -100,14 +102,9 @@ u32 spd_decode_eeprom_size_ddr2(u8 byte1) * * Returns the index fof MSB set. */ -static u8 spd_get_msbs(u8 c) +u8 spd_get_msbs(u8 c) { - int i; - for (i = 7; i >= 0; i--) - if (c & (1 << i)) - return i; - - return 0; + return log2(c); } /** @@ -629,3 +626,25 @@ void dram_print_spd_ddr2(const struct dimm_attr_st *dimm) print_us(" tPLL : ", dimm->tPLL); print_us(" tRR : ", dimm->tRR); } + +void normalize_tck(u32 *tclk) +{ + if (*tclk <= TCK_800MHZ) { + *tclk = TCK_800MHZ; + } else if (*tclk <= TCK_666MHZ) { + *tclk = TCK_666MHZ; + } else if (*tclk <= TCK_533MHZ) { + *tclk = TCK_533MHZ; + } else if (*tclk <= TCK_400MHZ) { + *tclk = TCK_400MHZ; + } else if (*tclk <= TCK_333MHZ) { + *tclk = TCK_333MHZ; + } else if (*tclk <= TCK_266MHZ) { + *tclk = TCK_266MHZ; + } else if (*tclk <= TCK_200MHZ) { + *tclk = TCK_200MHZ; + } else { + *tclk = 0; + printk(BIOS_ERR, "Too slow common tCLK found\n"); + } +} diff --git a/src/include/device/dram/ddr2.h b/src/include/device/dram/ddr2.h index 8ea80b986a..ea9b3ba535 100644 --- a/src/include/device/dram/ddr2.h +++ b/src/include/device/dram/ddr2.h @@ -213,6 +213,7 @@ u32 spd_decode_spd_size_ddr2(u8 byte0); u32 spd_decode_eeprom_size_ddr2(u8 byte1); int spd_decode_ddr2(struct dimm_attr_st *dimm, u8 spd[SPD_SIZE_MAX_DDR2]); void dram_print_spd_ddr2(const struct dimm_attr_st *dimm); - +void normalize_tck(u32 *tclk); +u8 spd_get_msbs(u8 c); #endif /* DEVICE_DRAM_DDR2L_H */ |