mirror of
https://github.com/AsahiLinux/u-boot
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ca0d29e4f0
This simple PMU driver allows to tyrn power on and off for selected devices. In particularly Intel Tangier needs to power on SDHCI controllers in order to access to them during board initialization. In the future it might be expanded to cover other Intel MID platforms, that's why it's located under arch/x86/lib and called pmu.c. Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Simon Glass <sjg@chromium.org>
303 lines
6.5 KiB
C
303 lines
6.5 KiB
C
/*
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* Copyright (c) 2014 The Chromium OS Authors.
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*
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* Part of this file is adapted from coreboot
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* src/arch/x86/include/arch/cpu.h and
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* src/arch/x86/lib/cpu.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _ASM_CPU_H
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#define _ASM_CPU_H
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enum {
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X86_VENDOR_INVALID = 0,
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X86_VENDOR_INTEL,
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X86_VENDOR_CYRIX,
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X86_VENDOR_AMD,
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X86_VENDOR_UMC,
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X86_VENDOR_NEXGEN,
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X86_VENDOR_CENTAUR,
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X86_VENDOR_RISE,
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X86_VENDOR_TRANSMETA,
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X86_VENDOR_NSC,
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X86_VENDOR_SIS,
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X86_VENDOR_ANY = 0xfe,
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X86_VENDOR_UNKNOWN = 0xff
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};
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/* Global descriptor table (GDT) bits */
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enum {
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GDT_4KB = 1ULL << 55,
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GDT_32BIT = 1ULL << 54,
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GDT_LONG = 1ULL << 53,
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GDT_PRESENT = 1ULL << 47,
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GDT_NOTSYS = 1ULL << 44,
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GDT_CODE = 1ULL << 43,
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GDT_LIMIT_LOW_SHIFT = 0,
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GDT_LIMIT_LOW_MASK = 0xffff,
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GDT_LIMIT_HIGH_SHIFT = 48,
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GDT_LIMIT_HIGH_MASK = 0xf,
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GDT_BASE_LOW_SHIFT = 16,
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GDT_BASE_LOW_MASK = 0xffff,
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GDT_BASE_HIGH_SHIFT = 56,
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GDT_BASE_HIGH_MASK = 0xf,
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};
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/*
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* System controllers in an x86 system. We mostly need to just find these and
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* use them on PCI. At some point these might have their own uclass (e.g.
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* UCLASS_VIDEO for the GMA device).
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*/
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enum {
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X86_NONE,
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X86_SYSCON_ME, /* Intel Management Engine */
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X86_SYSCON_PINCONF, /* Intel x86 pin configuration */
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X86_SYSCON_PMU, /* Power Management Unit */
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X86_SYSCON_SCU, /* System Controller Unit */
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};
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struct cpuid_result {
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uint32_t eax;
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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};
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/*
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* Generic CPUID function
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*/
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static inline struct cpuid_result cpuid(int op)
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{
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struct cpuid_result result;
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asm volatile(
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"mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%ebx, %%esi;"
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"mov %%edi, %%ebx;"
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: "=a" (result.eax),
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"=S" (result.ebx),
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"=c" (result.ecx),
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"=d" (result.edx)
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: "0" (op)
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: "edi");
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return result;
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}
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/*
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* Generic Extended CPUID function
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*/
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static inline struct cpuid_result cpuid_ext(int op, unsigned ecx)
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{
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struct cpuid_result result;
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asm volatile(
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"mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%ebx, %%esi;"
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"mov %%edi, %%ebx;"
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: "=a" (result.eax),
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"=S" (result.ebx),
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"=c" (result.ecx),
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"=d" (result.edx)
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: "0" (op), "2" (ecx)
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: "edi");
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return result;
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}
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/*
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* CPUID functions returning a single datum
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*/
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static inline unsigned int cpuid_eax(unsigned int op)
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{
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unsigned int eax;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%edi, %%ebx;"
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: "=a" (eax)
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: "0" (op)
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: "ecx", "edx", "edi");
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return eax;
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}
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static inline unsigned int cpuid_ebx(unsigned int op)
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{
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unsigned int eax, ebx;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%ebx, %%esi;"
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"mov %%edi, %%ebx;"
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: "=a" (eax), "=S" (ebx)
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: "0" (op)
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: "ecx", "edx", "edi");
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return ebx;
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}
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static inline unsigned int cpuid_ecx(unsigned int op)
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{
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unsigned int eax, ecx;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%edi, %%ebx;"
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: "=a" (eax), "=c" (ecx)
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: "0" (op)
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: "edx", "edi");
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return ecx;
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}
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static inline unsigned int cpuid_edx(unsigned int op)
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{
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unsigned int eax, edx;
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__asm__("mov %%ebx, %%edi;"
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"cpuid;"
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"mov %%edi, %%ebx;"
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: "=a" (eax), "=d" (edx)
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: "0" (op)
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: "ecx", "edi");
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return edx;
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}
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#if !CONFIG_IS_ENABLED(X86_64)
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/* Standard macro to see if a specific flag is changeable */
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static inline int flag_is_changeable_p(uint32_t flag)
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{
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uint32_t f1, f2;
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asm(
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"pushfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"movl %0,%1\n\t"
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"xorl %2,%0\n\t"
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"pushl %0\n\t"
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"popfl\n\t"
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"pushfl\n\t"
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"popl %0\n\t"
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"popfl\n\t"
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: "=&r" (f1), "=&r" (f2)
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: "ir" (flag));
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return ((f1^f2) & flag) != 0;
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}
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#endif
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static inline void mfence(void)
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{
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__asm__ __volatile__("mfence" : : : "memory");
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}
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/**
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* cpu_enable_paging_pae() - Enable PAE-paging
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*
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* @cr3: Value to set in cr3 (PDPT or PML4T)
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*/
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void cpu_enable_paging_pae(ulong cr3);
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/**
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* cpu_disable_paging_pae() - Disable paging and PAE
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*/
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void cpu_disable_paging_pae(void);
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/**
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* cpu_has_64bit() - Check if the CPU has 64-bit support
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*
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* @return 1 if this CPU supports long mode (64-bit), 0 if not
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*/
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int cpu_has_64bit(void);
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/**
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* cpu_vendor_name() - Get CPU vendor name
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*
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* @vendor: CPU vendor enumeration number
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*
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* @return: Address to hold the CPU vendor name string
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*/
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const char *cpu_vendor_name(int vendor);
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#define CPU_MAX_NAME_LEN 49
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/**
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* cpu_get_name() - Get the name of the current cpu
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*
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* @name: Place to put name, which must be CPU_MAX_NAME_LEN bytes including
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* @return pointer to name, which will likely be a few bytes after the start
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* of @name
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* \0 terminator
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*/
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char *cpu_get_name(char *name);
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/**
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* cpu_call64() - Jump to a 64-bit Linux kernel (internal function)
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*
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* The kernel is uncompressed and the 64-bit entry point is expected to be
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* at @target.
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*
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* This function is used internally - see cpu_jump_to_64bit() for a more
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* useful function.
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*
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* @pgtable: Address of 24KB area containing the page table
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* @setup_base: Pointer to the setup.bin information for the kernel
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* @target: Pointer to the start of the kernel image
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*/
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void cpu_call64(ulong pgtable, ulong setup_base, ulong target);
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/**
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* cpu_call32() - Jump to a 32-bit entry point
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*
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* @code_seg32: 32-bit code segment to use (GDT offset, e.g. 0x20)
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* @target: Pointer to the start of the 32-bit U-Boot image/entry point
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* @table: Pointer to start of info table to pass to U-Boot
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*/
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void cpu_call32(ulong code_seg32, ulong target, ulong table);
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/**
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* cpu_jump_to_64bit() - Jump to a 64-bit Linux kernel
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*
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* The kernel is uncompressed and the 64-bit entry point is expected to be
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* at @target.
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*
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* @setup_base: Pointer to the setup.bin information for the kernel
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* @target: Pointer to the start of the kernel image
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*/
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int cpu_jump_to_64bit(ulong setup_base, ulong target);
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/**
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* cpu_jump_to_64bit_uboot() - special function to jump from SPL to U-Boot
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*
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* This handles calling from 32-bit SPL to 64-bit U-Boot.
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*
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* @target: Address of U-Boot in RAM
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*/
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int cpu_jump_to_64bit_uboot(ulong target);
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/**
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* cpu_get_family_model() - Get the family and model for the CPU
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*
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* @return the CPU ID masked with 0x0fff0ff0
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*/
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u32 cpu_get_family_model(void);
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/**
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* cpu_get_stepping() - Get the stepping value for the CPU
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*
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* @return the CPU ID masked with 0xf
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*/
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u32 cpu_get_stepping(void);
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/**
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* cpu_run_reference_code() - Run the platform reference code
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*
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* Some platforms require a binary blob to be executed once SDRAM is
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* available. This is used to set up various platform features, such as the
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* platform controller hub (PCH). This function should be implemented by the
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* CPU-specific code.
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*
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* @return 0 on success, -ve on failure
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*/
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int cpu_run_reference_code(void);
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#endif
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