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u-boot/arch/arm/include/asm/system.h
Beniamino Galvani 5a07abb370 arm: implement generic PSCI reset call for armv8 
Add a psci_system_reset() which calls the SYSTEM_RESET function of
PSCI 0.2 and can be used by boards that support it to implement
reset_cpu().

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2016-05-27 15:39:46 -04:00

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#ifndef __ASM_ARM_SYSTEM_H
#define __ASM_ARM_SYSTEM_H
#include <common.h>
#include <linux/compiler.h>
#ifdef CONFIG_ARM64
/*
* SCTLR_EL1/SCTLR_EL2/SCTLR_EL3 bits definitions
*/
#define CR_M (1 << 0) /* MMU enable */
#define CR_A (1 << 1) /* Alignment abort enable */
#define CR_C (1 << 2) /* Dcache enable */
#define CR_SA (1 << 3) /* Stack Alignment Check Enable */
#define CR_I (1 << 12) /* Icache enable */
#define CR_WXN (1 << 19) /* Write Permision Imply XN */
#define CR_EE (1 << 25) /* Exception (Big) Endian */
#ifndef __ASSEMBLY__
u64 get_page_table_size(void);
#define PGTABLE_SIZE get_page_table_size()
/* 2MB granularity */
#define MMU_SECTION_SHIFT 21
#define MMU_SECTION_SIZE (1 << MMU_SECTION_SHIFT)
/* These constants need to be synced to the MT_ types in asm/armv8/mmu.h */
enum dcache_option {
DCACHE_OFF = 0 << 2,
DCACHE_WRITETHROUGH = 3 << 2,
DCACHE_WRITEBACK = 4 << 2,
DCACHE_WRITEALLOC = 4 << 2,
};
#define isb() \
({asm volatile( \
"isb" : : : "memory"); \
})
#define wfi() \
({asm volatile( \
"wfi" : : : "memory"); \
})
static inline unsigned int current_el(void)
{
unsigned int el;
asm volatile("mrs %0, CurrentEL" : "=r" (el) : : "cc");
return el >> 2;
}
static inline unsigned int get_sctlr(void)
{
unsigned int el, val;
el = current_el();
if (el == 1)
asm volatile("mrs %0, sctlr_el1" : "=r" (val) : : "cc");
else if (el == 2)
asm volatile("mrs %0, sctlr_el2" : "=r" (val) : : "cc");
else
asm volatile("mrs %0, sctlr_el3" : "=r" (val) : : "cc");
return val;
}
static inline void set_sctlr(unsigned int val)
{
unsigned int el;
el = current_el();
if (el == 1)
asm volatile("msr sctlr_el1, %0" : : "r" (val) : "cc");
else if (el == 2)
asm volatile("msr sctlr_el2, %0" : : "r" (val) : "cc");
else
asm volatile("msr sctlr_el3, %0" : : "r" (val) : "cc");
asm volatile("isb");
}
static inline unsigned long read_mpidr(void)
{
unsigned long val;
asm volatile("mrs %0, mpidr_el1" : "=r" (val));
return val;
}
#define BSP_COREID 0
void __asm_flush_dcache_all(void);
void __asm_invalidate_dcache_all(void);
void __asm_flush_dcache_range(u64 start, u64 end);
void __asm_invalidate_tlb_all(void);
void __asm_invalidate_icache_all(void);
int __asm_flush_l3_cache(void);
void __asm_switch_ttbr(u64 new_ttbr);
void armv8_switch_to_el2(void);
void armv8_switch_to_el1(void);
void gic_init(void);
void gic_send_sgi(unsigned long sgino);
void wait_for_wakeup(void);
void protect_secure_region(void);
void smp_kick_all_cpus(void);
void flush_l3_cache(void);
/*
*Issue a hypervisor call in accordance with ARM "SMC Calling convention",
* DEN0028A
*
* @args: input and output arguments
*
*/
void hvc_call(struct pt_regs *args);
/*
*Issue a secure monitor call in accordance with ARM "SMC Calling convention",
* DEN0028A
*
* @args: input and output arguments
*
*/
void smc_call(struct pt_regs *args);
void __noreturn psci_system_reset(bool smc);
#endif /* __ASSEMBLY__ */
#else /* CONFIG_ARM64 */
#ifdef __KERNEL__
#define CPU_ARCH_UNKNOWN 0
#define CPU_ARCH_ARMv3 1
#define CPU_ARCH_ARMv4 2
#define CPU_ARCH_ARMv4T 3
#define CPU_ARCH_ARMv5 4
#define CPU_ARCH_ARMv5T 5
#define CPU_ARCH_ARMv5TE 6
#define CPU_ARCH_ARMv5TEJ 7
#define CPU_ARCH_ARMv6 8
#define CPU_ARCH_ARMv7 9
/*
* CR1 bits (CP#15 CR1)
*/
#define CR_M (1 << 0) /* MMU enable */
#define CR_A (1 << 1) /* Alignment abort enable */
#define CR_C (1 << 2) /* Dcache enable */
#define CR_W (1 << 3) /* Write buffer enable */
#define CR_P (1 << 4) /* 32-bit exception handler */
#define CR_D (1 << 5) /* 32-bit data address range */
#define CR_L (1 << 6) /* Implementation defined */
#define CR_B (1 << 7) /* Big endian */
#define CR_S (1 << 8) /* System MMU protection */
#define CR_R (1 << 9) /* ROM MMU protection */
#define CR_F (1 << 10) /* Implementation defined */
#define CR_Z (1 << 11) /* Implementation defined */
#define CR_I (1 << 12) /* Icache enable */
#define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
#define CR_RR (1 << 14) /* Round Robin cache replacement */
#define CR_L4 (1 << 15) /* LDR pc can set T bit */
#define CR_DT (1 << 16)
#define CR_IT (1 << 18)
#define CR_ST (1 << 19)
#define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
#define CR_U (1 << 22) /* Unaligned access operation */
#define CR_XP (1 << 23) /* Extended page tables */
#define CR_VE (1 << 24) /* Vectored interrupts */
#define CR_EE (1 << 25) /* Exception (Big) Endian */
#define CR_TRE (1 << 28) /* TEX remap enable */
#define CR_AFE (1 << 29) /* Access flag enable */
#define CR_TE (1 << 30) /* Thumb exception enable */
#if defined(CONFIG_ARMV7_LPAE) && !defined(PGTABLE_SIZE)
#define PGTABLE_SIZE (4096 * 5)
#elif !defined(PGTABLE_SIZE)
#define PGTABLE_SIZE (4096 * 4)
#endif
/*
* This is used to ensure the compiler did actually allocate the register we
* asked it for some inline assembly sequences. Apparently we can't trust
* the compiler from one version to another so a bit of paranoia won't hurt.
* This string is meant to be concatenated with the inline asm string and
* will cause compilation to stop on mismatch.
* (for details, see gcc PR 15089)
*/
#define __asmeq(x, y) ".ifnc " x "," y " ; .err ; .endif\n\t"
#ifndef __ASSEMBLY__
/**
* save_boot_params() - Save boot parameters before starting reset sequence
*
* If you provide this function it will be called immediately U-Boot starts,
* both for SPL and U-Boot proper.
*
* All registers are unchanged from U-Boot entry. No registers need be
* preserved.
*
* This is not a normal C function. There is no stack. Return by branching to
* save_boot_params_ret.
*
* void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3);
*/
/**
* save_boot_params_ret() - Return from save_boot_params()
*
* If you provide save_boot_params(), then you should jump back to this
* function when done. Try to preserve all registers.
*
* If your implementation of save_boot_params() is in C then it is acceptable
* to simply call save_boot_params_ret() at the end of your function. Since
* there is no link register set up, you cannot just exit the function. U-Boot
* will return to the (initialised) value of lr, and likely crash/hang.
*
* If your implementation of save_boot_params() is in assembler then you
* should use 'b' or 'bx' to return to save_boot_params_ret.
*/
void save_boot_params_ret(void);
#define isb() __asm__ __volatile__ ("" : : : "memory")
#define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
#ifdef __ARM_ARCH_7A__
#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
#else
#define wfi()
#endif
static inline unsigned long get_cpsr(void)
{
unsigned long cpsr;
asm volatile("mrs %0, cpsr" : "=r"(cpsr): );
return cpsr;
}
static inline int is_hyp(void)
{
#ifdef CONFIG_ARMV7_LPAE
/* HYP mode requires LPAE ... */
return ((get_cpsr() & 0x1f) == 0x1a);
#else
/* ... so without LPAE support we can optimize all hyp code away */
return 0;
#endif
}
static inline unsigned int get_cr(void)
{
unsigned int val;
if (is_hyp())
asm volatile("mrc p15, 4, %0, c1, c0, 0 @ get CR" : "=r" (val)
:
: "cc");
else
asm volatile("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val)
:
: "cc");
return val;
}
static inline void set_cr(unsigned int val)
{
if (is_hyp())
asm volatile("mcr p15, 4, %0, c1, c0, 0 @ set CR" :
: "r" (val)
: "cc");
else
asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR" :
: "r" (val)
: "cc");
isb();
}
static inline unsigned int get_dacr(void)
{
unsigned int val;
asm("mrc p15, 0, %0, c3, c0, 0 @ get DACR" : "=r" (val) : : "cc");
return val;
}
static inline void set_dacr(unsigned int val)
{
asm volatile("mcr p15, 0, %0, c3, c0, 0 @ set DACR"
: : "r" (val) : "cc");
isb();
}
#ifdef CONFIG_ARMV7_LPAE
/* Long-Descriptor Translation Table Level 1/2 Bits */
#define TTB_SECT_XN_MASK (1ULL << 54)
#define TTB_SECT_NG_MASK (1 << 11)
#define TTB_SECT_AF (1 << 10)
#define TTB_SECT_SH_MASK (3 << 8)
#define TTB_SECT_NS_MASK (1 << 5)
#define TTB_SECT_AP (1 << 6)
/* Note: TTB AP bits are set elsewhere */
#define TTB_SECT_MAIR(x) ((x & 0x7) << 2) /* Index into MAIR */
#define TTB_SECT (1 << 0)
#define TTB_PAGETABLE (3 << 0)
/* TTBCR flags */
#define TTBCR_EAE (1 << 31)
#define TTBCR_T0SZ(x) ((x) << 0)
#define TTBCR_T1SZ(x) ((x) << 16)
#define TTBCR_USING_TTBR0 (TTBCR_T0SZ(0) | TTBCR_T1SZ(0))
#define TTBCR_IRGN0_NC (0 << 8)
#define TTBCR_IRGN0_WBWA (1 << 8)
#define TTBCR_IRGN0_WT (2 << 8)
#define TTBCR_IRGN0_WBNWA (3 << 8)
#define TTBCR_IRGN0_MASK (3 << 8)
#define TTBCR_ORGN0_NC (0 << 10)
#define TTBCR_ORGN0_WBWA (1 << 10)
#define TTBCR_ORGN0_WT (2 << 10)
#define TTBCR_ORGN0_WBNWA (3 << 10)
#define TTBCR_ORGN0_MASK (3 << 10)
#define TTBCR_SHARED_NON (0 << 12)
#define TTBCR_SHARED_OUTER (2 << 12)
#define TTBCR_SHARED_INNER (3 << 12)
#define TTBCR_EPD0 (0 << 7)
/*
* Memory types
*/
#define MEMORY_ATTRIBUTES ((0x00 << (0 * 8)) | (0x88 << (1 * 8)) | \
(0xcc << (2 * 8)) | (0xff << (3 * 8)))
/* options available for data cache on each page */
enum dcache_option {
DCACHE_OFF = TTB_SECT | TTB_SECT_MAIR(0),
DCACHE_WRITETHROUGH = TTB_SECT | TTB_SECT_MAIR(1),
DCACHE_WRITEBACK = TTB_SECT | TTB_SECT_MAIR(2),
DCACHE_WRITEALLOC = TTB_SECT | TTB_SECT_MAIR(3),
};
#elif defined(CONFIG_CPU_V7)
/* Short-Descriptor Translation Table Level 1 Bits */
#define TTB_SECT_NS_MASK (1 << 19)
#define TTB_SECT_NG_MASK (1 << 17)
#define TTB_SECT_S_MASK (1 << 16)
/* Note: TTB AP bits are set elsewhere */
#define TTB_SECT_AP (3 << 10)
#define TTB_SECT_TEX(x) ((x & 0x7) << 12)
#define TTB_SECT_DOMAIN(x) ((x & 0xf) << 5)
#define TTB_SECT_XN_MASK (1 << 4)
#define TTB_SECT_C_MASK (1 << 3)
#define TTB_SECT_B_MASK (1 << 2)
#define TTB_SECT (2 << 0)
/* options available for data cache on each page */
enum dcache_option {
DCACHE_OFF = TTB_SECT_DOMAIN(0) | TTB_SECT_XN_MASK | TTB_SECT,
DCACHE_WRITETHROUGH = DCACHE_OFF | TTB_SECT_C_MASK,
DCACHE_WRITEBACK = DCACHE_WRITETHROUGH | TTB_SECT_B_MASK,
DCACHE_WRITEALLOC = DCACHE_WRITEBACK | TTB_SECT_TEX(1),
};
#else
#define TTB_SECT_AP (3 << 10)
/* options available for data cache on each page */
enum dcache_option {
DCACHE_OFF = 0x12,
DCACHE_WRITETHROUGH = 0x1a,
DCACHE_WRITEBACK = 0x1e,
DCACHE_WRITEALLOC = 0x16,
};
#endif
/* Size of an MMU section */
enum {
#ifdef CONFIG_ARMV7_LPAE
MMU_SECTION_SHIFT = 21, /* 2MB */
#else
MMU_SECTION_SHIFT = 20, /* 1MB */
#endif
MMU_SECTION_SIZE = 1 << MMU_SECTION_SHIFT,
};
#ifdef CONFIG_CPU_V7
/* TTBR0 bits */
#define TTBR0_BASE_ADDR_MASK 0xFFFFC000
#define TTBR0_RGN_NC (0 << 3)
#define TTBR0_RGN_WBWA (1 << 3)
#define TTBR0_RGN_WT (2 << 3)
#define TTBR0_RGN_WB (3 << 3)
/* TTBR0[6] is IRGN[0] and TTBR[0] is IRGN[1] */
#define TTBR0_IRGN_NC (0 << 0 | 0 << 6)
#define TTBR0_IRGN_WBWA (0 << 0 | 1 << 6)
#define TTBR0_IRGN_WT (1 << 0 | 0 << 6)
#define TTBR0_IRGN_WB (1 << 0 | 1 << 6)
#endif
/**
* Register an update to the page tables, and flush the TLB
*
* \param start start address of update in page table
* \param stop stop address of update in page table
*/
void mmu_page_table_flush(unsigned long start, unsigned long stop);
#endif /* __ASSEMBLY__ */
#define arch_align_stack(x) (x)
#endif /* __KERNEL__ */
#endif /* CONFIG_ARM64 */
#ifndef __ASSEMBLY__
/**
* Change the cache settings for a region.
*
* \param start start address of memory region to change
* \param size size of memory region to change
* \param option dcache option to select
*/
void mmu_set_region_dcache_behaviour(phys_addr_t start, size_t size,
enum dcache_option option);
#ifdef CONFIG_SYS_NONCACHED_MEMORY
void noncached_init(void);
phys_addr_t noncached_alloc(size_t size, size_t align);
#endif /* CONFIG_SYS_NONCACHED_MEMORY */
#endif /* __ASSEMBLY__ */
#endif
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