faf7b7af6e
On some SoCs (for example AM35xx), the ROM bootloader passes useful information in r0 when jumping to barebox. To avoid overwriting this in the generic reset code, we introduce common_reset as a C function and as an assembler macro. This is then called form the reset entry point (either in common or in board code). This patch is based on code by Sascha Hauer <s.hauer@pengutronix.de>. Signed-off-by: Jan Luebbe <jlu@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
77 lines
3 KiB
C
77 lines
3 KiB
C
#ifndef __ASM_ARM_SYSTEM_H
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#define __ASM_ARM_SYSTEM_H
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#if __LINUX_ARM_ARCH__ >= 7
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#define isb() __asm__ __volatile__ ("isb" : : : "memory")
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#define dsb() __asm__ __volatile__ ("dsb" : : : "memory")
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#define dmb() __asm__ __volatile__ ("dmb" : : : "memory")
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#elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6
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#define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
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: : "r" (0) : "memory")
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#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
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: : "r" (0) : "memory")
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#define dmb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 5" \
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: : "r" (0) : "memory")
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#elif defined(CONFIG_CPU_FA526)
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#define isb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \
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: : "r" (0) : "memory")
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#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
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: : "r" (0) : "memory")
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#define dmb() __asm__ __volatile__ ("" : : : "memory")
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#else
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#define isb() __asm__ __volatile__ ("" : : : "memory")
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#define dsb() __asm__ __volatile__ ("mcr p15, 0, %0, c7, c10, 4" \
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: : "r" (0) : "memory")
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#define dmb() __asm__ __volatile__ ("" : : : "memory")
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#endif
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/*
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* CR1 bits (CP#15 CR1)
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*/
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#define CR_M (1 << 0) /* MMU enable */
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#define CR_A (1 << 1) /* Alignment abort enable */
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#define CR_C (1 << 2) /* Dcache enable */
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#define CR_W (1 << 3) /* Write buffer enable */
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#define CR_P (1 << 4) /* 32-bit exception handler */
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#define CR_D (1 << 5) /* 32-bit data address range */
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#define CR_L (1 << 6) /* Implementation defined */
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#define CR_B (1 << 7) /* Big endian */
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#define CR_S (1 << 8) /* System MMU protection */
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#define CR_R (1 << 9) /* ROM MMU protection */
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#define CR_F (1 << 10) /* Implementation defined */
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#define CR_Z (1 << 11) /* Implementation defined */
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#define CR_I (1 << 12) /* Icache enable */
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#define CR_V (1 << 13) /* Vectors relocated to 0xffff0000 */
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#define CR_RR (1 << 14) /* Round Robin cache replacement */
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#define CR_L4 (1 << 15) /* LDR pc can set T bit */
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#define CR_DT (1 << 16)
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#define CR_IT (1 << 18)
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#define CR_ST (1 << 19)
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#define CR_FI (1 << 21) /* Fast interrupt (lower latency mode) */
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#define CR_U (1 << 22) /* Unaligned access operation */
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#define CR_XP (1 << 23) /* Extended page tables */
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#define CR_VE (1 << 24) /* Vectored interrupts */
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#define CR_EE (1 << 25) /* Exception (Big) Endian */
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#define CR_TRE (1 << 28) /* TEX remap enable */
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#define CR_AFE (1 << 29) /* Access flag enable */
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#define CR_TE (1 << 30) /* Thumb exception enable */
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#ifndef __ASSEMBLY__
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static inline unsigned int get_cr(void)
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{
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unsigned int val;
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asm volatile ("mrc p15, 0, %0, c1, c0, 0 @ get CR" : "=r" (val) : : "cc");
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return val;
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}
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static inline void set_cr(unsigned int val)
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{
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asm volatile("mcr p15, 0, %0, c1, c0, 0 @ set CR"
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: : "r" (val) : "cc");
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isb();
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}
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#endif
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#endif /* __ASM_ARM_SYSTEM_H */
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