| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <cpu/cpu.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/intel/speedstep.h> |
| #include <cpu/x86/cache.h> |
| #include <cpu/x86/name.h> |
| |
| #define HIGHEST_CLEVEL 3 |
| static void configure_c_states(void) |
| { |
| msr_t msr; |
| |
| msr = rdmsr(MSR_PKG_CST_CONFIG_CONTROL); |
| msr.lo |= (1 << 15); // Lock configuration |
| msr.lo |= (1 << 10); // redirect IO-based CState transition requests to |
| // MWAIT |
| msr.lo &= ~(1 << 9); // Issue a single stop grant cycle upon stpclk |
| msr.lo &= ~7; msr.lo |= HIGHEST_CLEVEL; // support at most C3 |
| // TODO Do we want Deep C4 and Dynamic L2 shrinking? |
| wrmsr(MSR_PKG_CST_CONFIG_CONTROL, msr); |
| |
| /* Set Processor MWAIT IO BASE (P_BLK) */ |
| msr.hi = 0; |
| // TODO Do we want PM1_BASE? Needs SMM? |
| //msr.lo = ((PMB0_BASE + 4) & 0xffff) | (((PMB1_BASE + 9) & 0xffff) |
| // << 16); |
| msr.lo = ((PMB0_BASE + 4) & 0xffff); |
| wrmsr(MSR_PMG_IO_BASE_ADDR, msr); |
| |
| /* set C_LVL controls */ |
| msr.hi = 0; |
| // -2 because LVL0+1 aren't counted |
| msr.lo = (PMB0_BASE + 4) | ((HIGHEST_CLEVEL - 2) << 16); |
| wrmsr(MSR_PMG_IO_CAPTURE_ADDR, msr); |
| } |
| |
| static void configure_misc(void) |
| { |
| msr_t msr; |
| |
| msr = rdmsr(IA32_MISC_ENABLE); |
| msr.lo |= (1 << 3); /* TM1 enable */ |
| msr.lo |= (1 << 13); /* TM2 enable */ |
| msr.lo |= (1 << 17); /* Bidirectional PROCHOT# */ |
| |
| msr.lo |= (1 << 10); /* FERR# multiplexing */ |
| |
| // TODO: Only if IA32_PLATFORM_ID[17] = 0 and IA32_PLATFORM_ID[50] = 1 |
| msr.lo |= (1 << 16); /* Enhanced SpeedStep Enable */ |
| |
| // TODO Do we want Deep C4 and Dynamic L2 shrinking? |
| wrmsr(IA32_MISC_ENABLE, msr); |
| |
| msr.lo |= (1 << 20); /* Lock Enhanced SpeedStep Enable */ |
| wrmsr(IA32_MISC_ENABLE, msr); |
| } |
| |
| static void model_106cx_init(struct device *cpu) |
| { |
| char processor_name[49]; |
| |
| /* Print processor name */ |
| fill_processor_name(processor_name); |
| printk(BIOS_INFO, "CPU: %s.\n", processor_name); |
| |
| /* Configure C States */ |
| configure_c_states(); |
| |
| /* Configure Enhanced SpeedStep and Thermal Sensors */ |
| configure_misc(); |
| |
| /* TODO: PIC thermal sensor control */ |
| } |
| |
| static struct device_operations cpu_dev_ops = { |
| .init = model_106cx_init, |
| }; |
| |
| static const struct cpu_device_id cpu_table[] = { |
| { X86_VENDOR_INTEL, 0x106c0, CPUID_EXACT_MATCH_MASK }, /* Intel Atom 230 */ |
| { X86_VENDOR_INTEL, 0x106ca, CPUID_EXACT_MATCH_MASK }, /* Intel Atom D5xx */ |
| CPU_TABLE_END |
| }; |
| |
| static const struct cpu_driver driver __cpu_driver = { |
| .ops = &cpu_dev_ops, |
| .id_table = cpu_table, |
| }; |