diff options
Diffstat (limited to 'src/soc/intel/baytrail/ramstage.c')
| -rw-r--r-- | src/soc/intel/baytrail/ramstage.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/soc/intel/baytrail/ramstage.c b/src/soc/intel/baytrail/ramstage.c new file mode 100644 index 0000000000..e30fc89bc2 --- /dev/null +++ b/src/soc/intel/baytrail/ramstage.c @@ -0,0 +1,107 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Google Inc. + * + * 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 + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/cpu.h> +#include <console/console.h> +#include <cpu/intel/microcode.h> +#include <cpu/x86/msr.h> +#include <device/device.h> +#include <device/pci_def.h> +#include <device/pci_ops.h> +#include <stdlib.h> + +#include <baytrail/pattrs.h> +#include <baytrail/lpc.h> +#include <baytrail/msr.h> +#include <baytrail/pci_devs.h> +#include <baytrail/ramstage.h> + +/* Global PATTRS */ +DEFINE_PATTRS; + +#define SHOW_PATTRS 1 + +static void detect_num_cpus(struct pattrs *attrs) +{ + int ecx = 0; + + while (1) { + struct cpuid_result leaf_b; + + leaf_b = cpuid_ext(0xb, ecx); + + /* Bay Trail doesn't have hyperthreading so just determine the + * number of cores by from level type (ecx[15:8] == * 2). */ + if ((leaf_b.ecx & 0xff00) == 0x0200) { + attrs->num_cpus = leaf_b.ebx & 0xffff; + break; + } + ecx++; + } +} + +static inline void fill_in_msr(msr_t *msr, int idx) +{ + *msr = rdmsr(idx); + if (SHOW_PATTRS) { + printk(BIOS_DEBUG, "msr(%x) = %08x%08x\n", + idx, msr->hi, msr->lo); + } +} + +static const char *stepping_str[] = { "A0", "A1", "B0", "B1", "B2", "B3" }; + +static void fill_in_pattrs(void) +{ + device_t dev; + struct pattrs *attrs = (struct pattrs *)pattrs_get(); + + attrs->cpuid = cpuid_eax(1); + dev = dev_find_slot(0, PCI_DEVFN(LPC_DEV, LPC_FUNC)); + attrs->revid = pci_read_config8(dev, REVID); + /* The revision to stepping IDs have two values per metal stepping. */ + if (attrs->revid >= RID_B_STEPPING_START) { + attrs->stepping = (attrs->revid - RID_B_STEPPING_START) / 2; + attrs->stepping += STEP_B0; + } else { + attrs->stepping = (attrs->revid - RID_A_STEPPING_START) / 2; + attrs->stepping += STEP_A0; + } + + attrs->microcode_patch = intel_microcode_find(); + attrs->address_bits = cpuid_eax(0x80000008) & 0xff; + detect_num_cpus(attrs); + + if (SHOW_PATTRS) { + printk(BIOS_DEBUG, "BYT: cpuid %08x cpus %d rid %02x step %s\n", + attrs->cpuid, attrs->num_cpus, attrs->revid, + (attrs->stepping >= ARRAY_SIZE(stepping_str)) ? "??" : + stepping_str[attrs->stepping]); + } + + fill_in_msr(&attrs->platform_id, MSR_IA32_PLATFORM_ID); + fill_in_msr(&attrs->platform_info, MSR_PLATFORM_INFO); + fill_in_msr(&attrs->iacore_ratios, MSR_IACORE_RATIOS); + fill_in_msr(&attrs->iacore_vids, MSR_IACORE_VIDS); +} + +void baytrail_init_pre_device(void) +{ + fill_in_pattrs(); +} |