/* * This file is part of the coreboot project. * * Copyright 2013 Google Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * cache.c: Cache maintenance routines for ARMv7-A and ARMv7-R * * Reference: ARM Architecture Reference Manual, ARMv7-A and ARMv7-R edition */ #include #include #define bitmask(high, low) ((1UL << (high)) + \ ((1UL << (high)) - 1) - ((1UL << (low)) - 1)) /* Basic log2() implementation. Note: log2(0) is 0 for our purposes. */ /* FIXME: src/include/lib.h is difficult to work with due to romcc */ static unsigned long log2(unsigned long u) { int i = 0; while (u >>= 1) i++; return i; } void tlb_invalidate_all(void) { /* * FIXME: ARMv7 Architecture Ref. Manual claims that the distinction * instruction vs. data TLBs is deprecated in ARMv7, however this does * not seem to be the case as of Cortex-A15. */ tlbiall(); dtlbiall(); itlbiall(); isb(); dsb(); } void icache_invalidate_all(void) { /* * icache can be entirely invalidated with one operation. * Note: If branch predictors are architecturally-visible, ICIALLU * also performs a BPIALL operation (B2-1283 in arch manual) */ iciallu(); isb(); } enum dcache_op { OP_DCCISW, OP_DCISW, OP_DCCIMVAC, OP_DCCMVAC, }; /* * Do a dcache operation on entire cache by set/way. This is done for * portability because mapping of memory address to cache location is * implementation defined (See note on "Requirements for operations by * set/way" in arch ref. manual). */ static void dcache_op_set_way(enum dcache_op op) { uint32_t ccsidr; unsigned int associativity, num_sets, linesize_bytes; unsigned int set, way; unsigned int level; level = (read_csselr() >> 1) & 0x7; /* * dcache must be invalidated by set/way for portability since virtual * memory mapping is system-defined. The number of sets and * associativity is given by CCSIDR. We'll use DCISW to invalidate the * dcache. */ ccsidr = read_ccsidr(); /* FIXME: rounding up required here? */ num_sets = ((ccsidr & bitmask(27, 13)) >> 13) + 1; associativity = ((ccsidr & bitmask(12, 3)) >> 3) + 1; /* FIXME: do we need to use CTR.DminLine here? */ linesize_bytes = (1 << ((ccsidr & 0x7) + 2)) * 4; /* * Set/way operations require an interesting bit packing. See section * B4-35 in the ARMv7 Architecture Reference Manual: * * A: Log2(associativity) * B: L+S * L: Log2(linesize) * S: Log2(num_sets) * * The bits are packed as follows: * 31 31-A B B-1 L L-1 4 3 1 0 * |---|-------------|--------|-------|-----|-| * |Way| zeros | Set | zeros |level|0| * |---|-------------|--------|-------|-----|-| */ for (way = 0; way < associativity; way++) { for (set = 0; set < num_sets; set++) { uint32_t val = 0; val |= way << (32 - log2(associativity)); val |= set << log2(linesize_bytes); val |= level << 1; switch(op) { case OP_DCCISW: dccisw(val); break; case OP_DCISW: dcisw(val); break; default: break; } } } dsb(); } void dcache_clean_invalidate_all(void) { dcache_op_set_way(OP_DCCISW); } void dcache_invalidate_all(void) { dcache_op_set_way(OP_DCISW); } static unsigned int line_bytes(void) { uint32_t ccsidr; unsigned int size; ccsidr = read_ccsidr(); /* [2:0] - Indicates (Log2(number of words in cache line)) - 2 */ size = 1 << ((ccsidr & 0x7) + 2); /* words per line */ size *= sizeof(unsigned int); /* bytes per line */ return size; } /* * Do a dcache operation by modified virtual address. This is useful for * maintaining coherency in drivers which do DMA transfers and only need to * perform cache maintenance on a particular memory range rather than the * entire cache. */ static void dcache_op_mva(unsigned long addr, unsigned long len, enum dcache_op op) { unsigned long line, linesize; linesize = line_bytes(); line = addr & ~(linesize - 1); dsb(); while (line < addr + len) { switch(op) { case OP_DCCIMVAC: dccimvac(line); break; default: break; } line += linesize; } isb(); } void dcache_clean_by_mva(unsigned long addr, unsigned long len) { dcache_op_mva(addr, len, OP_DCCMVAC); } void dcache_clean_invalidate_by_mva(unsigned long addr, unsigned long len) { dcache_op_mva(addr, len, OP_DCCIMVAC); } void dcache_mmu_disable(void) { uint32_t sctlr, clidr; int level; clidr = read_clidr(); for (level = 0; level < 7; level++) { unsigned int ctype = (clidr >> (level * 3)) & 0x7; uint32_t csselr; switch(ctype) { case 0x0: /* no cache */ break; case 0x2: case 0x4: /* dcache only or unified cache */ csselr = level << 1; write_csselr(csselr); dcache_clean_invalidate_all(); break; case 0x3: /* separate icache and dcache */ csselr = level << 1; write_csselr(csselr); dcache_clean_invalidate_all(); break; default: /* reserved */ break; } } sctlr = read_sctlr(); sctlr &= ~(SCTLR_C | SCTLR_M); write_sctlr(sctlr); } void dcache_mmu_enable(void) { uint32_t sctlr; sctlr = read_sctlr(); dcache_clean_invalidate_all(); sctlr |= SCTLR_C | SCTLR_M; write_sctlr(sctlr); } void armv7_invalidate_caches(void) { uint32_t clidr; int level; /* Invalidate branch predictor */ bpiall(); /* Iterate thru each cache identified in CLIDR and invalidate */ clidr = read_clidr(); for (level = 0; level < 7; level++) { unsigned int ctype = (clidr >> (level * 3)) & 0x7; uint32_t csselr; switch(ctype) { case 0x0: /* no cache */ break; case 0x1: /* icache only */ csselr = (level << 1) | 1; write_csselr(csselr); icache_invalidate_all(); break; case 0x2: case 0x4: /* dcache only or unified cache */ dcache_invalidate_all(); break; case 0x3: /* separate icache and dcache */ csselr = (level << 1) | 1; write_csselr(csselr); icache_invalidate_all(); csselr = level << 1; write_csselr(csselr); dcache_invalidate_all(); break; default: /* reserved */ break; } } /* Invalidate TLB */ tlb_invalidate_all(); }