diff options
Diffstat (limited to 'src/cpu/via/nano/nano_init.c')
| -rw-r--r-- | src/cpu/via/nano/nano_init.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/cpu/via/nano/nano_init.c b/src/cpu/via/nano/nano_init.c new file mode 100644 index 0000000000..417119f356 --- /dev/null +++ b/src/cpu/via/nano/nano_init.c @@ -0,0 +1,204 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com> + * + * 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, either version 2 of the License, or + * (at your option) any later version. + * + * 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, see <http://www.gnu.org/licenses/>. + */ + +#include "update_ucode.h" +#include <console/console.h> +#include <device/device.h> +#include <cpu/cpu.h> +#include <cpu/x86/mtrr.h> +#include <cpu/x86/msr.h> +#include <cpu/x86/lapic.h> +#include <cpu/x86/cache.h> +#include <delay.h> + +#define MODEL_NANO 0x2 +#define MODEL_NANO_3000_B0 0x8 +#define MODEL_NANO_3000_B2 0xa + +#define MSR_IA32_PERF_STATUS 0x00000198 +#define MSR_IA32_PERF_CTL 0x00000199 +#define MSR_IA32_MISC_ENABLE 0x000001a0 +#define NANO_MYSTERIOUS_MSR 0x120e + +static void nano_finish_fid_vid_transition(void) +{ + + msr_t msr; + /* Wait until the power transition ends */ + int cnt = 0; + do { + udelay(16); + msr = rdmsr(MSR_IA32_PERF_STATUS); + cnt++; + if (cnt > 128) { + printk(BIOS_WARNING, + "Error while updating multiplier and voltage\n"); + break; + } + } while (msr.lo & ((1 << 16) | (1 << 17))); + + /* Print the new FID and Voltage */ + u8 cur_vid = (msr.lo >> 0) & 0xff; + u8 cur_fid = (msr.lo >> 8) & 0xff; + printk(BIOS_INFO, "New CPU multiplier: %dx\n", cur_fid); + printk(BIOS_INFO, "New Voltage ID : %dx\n", cur_vid); +} + +static void nano_set_max_fid_vid(void) +{ + msr_t msr; + /* Get voltage and frequency info */ + msr = rdmsr(MSR_IA32_PERF_STATUS); + u8 min_fid = (msr.hi >> 24); + u8 max_fid = (msr.hi >> 8) & 0xff; + u8 min_vid = (msr.hi >> 16) & 0xff; + u8 max_vid = (msr.hi >> 0) & 0xff; + u8 cur_vid = (msr.lo >> 0) & 0xff; + u8 cur_fid = (msr.lo >> 8) & 0xff; + + printk(BIOS_INFO, "CPU multiplier: %dx (min %dx; max %dx)\n", + cur_fid, min_fid, max_fid); + printk(BIOS_INFO, "Voltage ID : %dx (min %dx; max %dx)\n", + cur_vid, min_vid, max_vid); + + if( (cur_fid != max_fid) || (cur_vid != max_vid) ) { + /* Set highest frequency and VID */ + msr.lo = msr.hi; + msr.hi = 0; + wrmsr(MSR_IA32_PERF_CTL, msr); + /* Wait for the transition to complete, otherwise, the CPU + * might reset itself repeatedly */ + nano_finish_fid_vid_transition(); + } + /* As a side note, if we didn't update the microcode by this point, the + * second PLL will not lock correctly. The clock will still be provided + * by the first PLL, and execution will continue normally, ___until___ + * the CPU switches PLL. Once that happens we will no longer have a + * working clock source, and the CPU will hang + * Moral of the story: update the microcode, or don't change FID + * This check is handled before calling nano_power() */ +} + +static void nano_power(void) +{ + msr_t msr; + /* Enable Powersaver */ + msr = rdmsr(MSR_IA32_MISC_ENABLE); + msr.lo |= (1 << 16); + wrmsr(MSR_IA32_MISC_ENABLE, msr); + + /* Enable 6 bit or 7-bit VRM support + * This MSR is not documented by VIA docs, other than setting these + * bits */ + msr = rdmsr(NANO_MYSTERIOUS_MSR); + msr.lo |= ( (1<<7) | (1<<4) ); + /* FIXME: Do we have a 6-bit or 7-bit VRM? + * set bit [5] for 7-bit, or don't set it for 6 bit VRM + * This will probably require a Kconfig option + * My board has a 7-bit VRM, so I can't test the 6-bit VRM stuff */ + msr.lo |= (1<<5); + wrmsr(NANO_MYSTERIOUS_MSR, msr); + + /* Set the maximum frequency and voltage */ + nano_set_max_fid_vid(); + + /* Enable TM3 */ + msr = rdmsr(MSR_IA32_MISC_ENABLE); + msr.lo |= ( (1<<3) | (1<<13) ); + wrmsr(MSR_IA32_MISC_ENABLE, msr); + + u8 stepping = ( cpuid_eax(0x1) ) &0xf; + if(stepping >= MODEL_NANO_3000_B0) { + /* Hello Nano 3000. The Terminator needs a CPU upgrade */ + /* Enable C1e, C2e, C3e, and C4e states */ + msr = rdmsr(MSR_IA32_MISC_ENABLE); + msr.lo |= ( (1<<25) | (1<<26) | (1<<31)); /* C1e, C2e, C3e */ + msr.hi |= (1<<0); /* C4e */ + wrmsr(MSR_IA32_MISC_ENABLE, msr); + } + + /* Lock on Powersaver */ + msr = rdmsr(MSR_IA32_MISC_ENABLE); + msr.lo |= (1<<20); + wrmsr(MSR_IA32_MISC_ENABLE, msr); +} + +static void nano_init(device_t dev) +{ + struct cpuinfo_x86 c; + + get_fms(&c, dev->device); + + /* We didn't test this on the Nano 1000/2000 series, so warn the user */ + if(c.x86_mask < MODEL_NANO_3000_B0) { + printk(BIOS_EMERG, "WARNING: This CPU has not been tested. " + "Please report any issues encountered. \n"); + } + switch (c.x86_mask) { + case MODEL_NANO: + printk(BIOS_INFO, "VIA Nano"); + break; + case MODEL_NANO_3000_B0: + printk(BIOS_INFO, "VIA Nano 3000 rev B0"); + break; + case MODEL_NANO_3000_B2: + printk(BIOS_INFO, "VIA Nano 3000 rev B2"); + break; + default: + printk(BIOS_EMERG, "Stepping not recognized: %x\n", c.x86_mask); + } + printk(BIOS_INFO, "\n"); + + /* We only read microcode from CBFS. If we don't have any microcode in + * CBFS, we'll just get back with 0 updates. User choice FTW. */ + unsigned int n_updates = nano_update_ucode(); + + if(n_updates != 0){ + nano_power(); + } else { + /* Changing the frequency or voltage without first updating the + * microcode will hang the CPU, so just don't do it */ + printk(BIOS_EMERG, "WARNING: CPU Microcode not updated.\n" + " Will not change frequency, as this may hang the CPU.\n"); + } + + /* Turn on cache */ + x86_enable_cache(); + /* Set up Memory Type Range Registers */ + x86_setup_mtrrs(); + x86_mtrr_check(); + /* Enable the local cpu apics */ + setup_lapic(); +} + +static struct device_operations cpu_dev_ops = { + .init = nano_init, +}; + +static struct cpu_device_id cpu_table[] = { + {X86_VENDOR_CENTAUR, 0x06f2}, // VIA NANO 1000/2000 Series + {X86_VENDOR_CENTAUR, 0x06f8}, // VIA NANO 3000 rev B0 + {X86_VENDOR_CENTAUR, 0x06fa}, // VIA NANO 3000 rev B2 + {0, 0}, +}; + +static const struct cpu_driver driver __cpu_driver = { + .ops = &cpu_dev_ops, + .id_table = cpu_table, +}; |