From 660d5f0d495197b4057bc1b3bdd201e500b03f1a Mon Sep 17 00:00:00 2001 From: Alexey Brodkin Date: Sun, 28 Dec 2014 02:42:12 +0300 Subject: arc: move common sources in library "reset.c" and "cpu.c" have no architecture-specific code at all. Others are applicable to either ARC CPU. This change is a preparation to submission of ARCv2 architecture port. Even though ARCv1 and ARCv2 ISAs are not binary compatible most of built-in modules still have the same programming model - AUX registers are mapped in the same addresses and hold the same data (new featues extend existing ones). So only low-level assembly code (start-up, interrupt handlers) is left as CPU(actually ISA)-specific. This significantyl simplifies maintenance of multiple CPUs/ISAs. Signed-off-by: Alexey Brodkin Signed-off-by: Igor Guryanov --- arch/arc/lib/cache.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 167 insertions(+) create mode 100644 arch/arc/lib/cache.c (limited to 'arch/arc/lib/cache.c') diff --git a/arch/arc/lib/cache.c b/arch/arc/lib/cache.c new file mode 100644 index 0000000..fa19a13 --- /dev/null +++ b/arch/arc/lib/cache.c @@ -0,0 +1,167 @@ +/* + * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include + +/* Bit values in IC_CTRL */ +#define IC_CTRL_CACHE_DISABLE (1 << 0) + +/* Bit values in DC_CTRL */ +#define DC_CTRL_CACHE_DISABLE (1 << 0) +#define DC_CTRL_INV_MODE_FLUSH (1 << 6) +#define DC_CTRL_FLUSH_STATUS (1 << 8) +#define CACHE_VER_NUM_MASK 0xF + +int icache_status(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return 0; + + return (read_aux_reg(ARC_AUX_IC_CTRL) & IC_CTRL_CACHE_DISABLE) != + IC_CTRL_CACHE_DISABLE; +} + +void icache_enable(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return; + + write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) & + ~IC_CTRL_CACHE_DISABLE); +} + +void icache_disable(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_IC_BUILD) & CACHE_VER_NUM_MASK)) + return; + + write_aux_reg(ARC_AUX_IC_CTRL, read_aux_reg(ARC_AUX_IC_CTRL) | + IC_CTRL_CACHE_DISABLE); +} + +void invalidate_icache_all(void) +{ +#ifndef CONFIG_SYS_ICACHE_OFF + /* Any write to IC_IVIC register triggers invalidation of entire I$ */ + write_aux_reg(ARC_AUX_IC_IVIC, 1); +#endif /* CONFIG_SYS_ICACHE_OFF */ +} + +int dcache_status(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return 0; + + return (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_CACHE_DISABLE) != + DC_CTRL_CACHE_DISABLE; +} + +void dcache_enable(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + + write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) & + ~(DC_CTRL_INV_MODE_FLUSH | DC_CTRL_CACHE_DISABLE)); +} + +void dcache_disable(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + + write_aux_reg(ARC_AUX_DC_CTRL, read_aux_reg(ARC_AUX_DC_CTRL) | + DC_CTRL_CACHE_DISABLE); +} + +void flush_dcache_all(void) +{ + /* If no cache in CPU exit immediately */ + if (!(read_aux_reg(ARC_BCR_DC_BUILD) & CACHE_VER_NUM_MASK)) + return; + + /* Do flush of entire cache */ + write_aux_reg(ARC_AUX_DC_FLSH, 1); + + /* Wait flush end */ + while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS) + ; +} + +#ifndef CONFIG_SYS_DCACHE_OFF +static void dcache_flush_line(unsigned addr) +{ +#if (CONFIG_ARC_MMU_VER > 2) + write_aux_reg(ARC_AUX_DC_PTAG, addr); +#endif + write_aux_reg(ARC_AUX_DC_FLDL, addr); + + /* Wait flush end */ + while (read_aux_reg(ARC_AUX_DC_CTRL) & DC_CTRL_FLUSH_STATUS) + ; + +#ifndef CONFIG_SYS_ICACHE_OFF + /* + * Invalidate I$ for addresses range just flushed from D$. + * If we try to execute data flushed above it will be valid/correct + */ +#if (CONFIG_ARC_MMU_VER > 2) + write_aux_reg(ARC_AUX_IC_PTAG, addr); +#endif + write_aux_reg(ARC_AUX_IC_IVIL, addr); +#endif /* CONFIG_SYS_ICACHE_OFF */ +} +#endif /* CONFIG_SYS_DCACHE_OFF */ + +void flush_dcache_range(unsigned long start, unsigned long end) +{ +#ifndef CONFIG_SYS_DCACHE_OFF + unsigned int addr; + + start = start & (~(CONFIG_SYS_CACHELINE_SIZE - 1)); + end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1)); + + for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) + dcache_flush_line(addr); +#endif /* CONFIG_SYS_DCACHE_OFF */ +} + +void invalidate_dcache_range(unsigned long start, unsigned long end) +{ +#ifndef CONFIG_SYS_DCACHE_OFF + unsigned int addr; + + start = start & (~(CONFIG_SYS_CACHELINE_SIZE - 1)); + end = end & (~(CONFIG_SYS_CACHELINE_SIZE - 1)); + + for (addr = start; addr <= end; addr += CONFIG_SYS_CACHELINE_SIZE) { +#if (CONFIG_ARC_MMU_VER > 2) + write_aux_reg(ARC_AUX_DC_PTAG, addr); +#endif + write_aux_reg(ARC_AUX_DC_IVDL, addr); + } +#endif /* CONFIG_SYS_DCACHE_OFF */ +} + +void invalidate_dcache_all(void) +{ +#ifndef CONFIG_SYS_DCACHE_OFF + /* Write 1 to DC_IVDC register triggers invalidation of entire D$ */ + write_aux_reg(ARC_AUX_DC_IVDC, 1); +#endif /* CONFIG_SYS_DCACHE_OFF */ +} + +void flush_cache(unsigned long start, unsigned long size) +{ + flush_dcache_range(start, start + size); +} -- cgit v1.1