diff options
| -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 */ |