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0153e43f7f
Holding the mutex just around the dcrypto_call is not enough: dcrypto instruction memory content might change in presence of multiple calling tasks. Switching to broad acquire/release pattern instead. Note to sub-projects: pair your dcrypto_init(_and_lock) w/ matching dcrypto_unlock BUG=none BRANCH=cr50 TEST=tcg_tests pass Change-Id: Idb7f2d79ce533db95cab51d89e3869ecf9f3d499 Reviewed-on: https://chromium-review.googlesource.com/535916 Commit-Ready: Marius Schilder <mschilder@chromium.org> Tested-by: Marius Schilder <mschilder@chromium.org> Reviewed-by: Marius Schilder <mschilder@chromium.org> Reviewed-by: Vadim Bendebury <vbendeb@chromium.org> Reviewed-by: Nadim Taha <ntaha@chromium.org>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "internal.h"
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#include "task.h"
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#include "registers.h"
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#define DMEM_NUM_WORDS 1024
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#define IMEM_NUM_WORDS 1024
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static struct mutex dcrypto_mutex;
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static volatile task_id_t my_task_id;
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static int dcrypto_is_initialized;
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void dcrypto_init_and_lock(void)
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{
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int i;
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volatile uint32_t *ptr;
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mutex_lock(&dcrypto_mutex);
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my_task_id = task_get_current();
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if (dcrypto_is_initialized)
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return;
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/* Enable PMU. */
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REG_WRITE_MLV(GR_PMU_PERICLKSET0, GC_PMU_PERICLKSET0_DCRYPTO0_CLK_MASK,
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GC_PMU_PERICLKSET0_DCRYPTO0_CLK_LSB, 1);
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/* Reset. */
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REG_WRITE_MLV(GR_PMU_RST0, GC_PMU_RST0_DCRYPTO0_MASK,
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GC_PMU_RST0_DCRYPTO0_LSB, 0);
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/* Turn off random nops (which are enabled by default). */
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GWRITE_FIELD(CRYPTO, RAND_STALL_CTL, STALL_EN, 0);
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/* Configure random nop percentage at 6%. */
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GWRITE_FIELD(CRYPTO, RAND_STALL_CTL, FREQ, 3);
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/* Now turn on random nops. */
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GWRITE_FIELD(CRYPTO, RAND_STALL_CTL, STALL_EN, 1);
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/* Initialize DMEM. */
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ptr = GREG32_ADDR(CRYPTO, DMEM_DUMMY);
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for (i = 0; i < DMEM_NUM_WORDS; ++i)
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*ptr++ = 0xdddddddd;
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/* Initialize IMEM. */
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ptr = GREG32_ADDR(CRYPTO, IMEM_DUMMY);
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for (i = 0; i < IMEM_NUM_WORDS; ++i)
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*ptr++ = 0xdddddddd;
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GREG32(CRYPTO, INT_STATE) = -1; /* Reset all the status bits. */
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GREG32(CRYPTO, INT_ENABLE) = -1; /* Enable all status bits. */
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task_enable_irq(GC_IRQNUM_CRYPTO0_HOST_CMD_DONE_INT);
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/* Reset. */
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GREG32(CRYPTO, CONTROL) = 1;
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GREG32(CRYPTO, CONTROL) = 0;
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dcrypto_is_initialized = 1;
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}
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void dcrypto_unlock(void)
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{
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mutex_unlock(&dcrypto_mutex);
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}
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#define DCRYPTO_CALL_TIMEOUT_US (700 * 1000)
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#define TASK_EVENT_DCRYPTO_DONE TASK_EVENT_CUSTOM(1)
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uint32_t dcrypto_call(uint32_t adr)
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{
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uint32_t event;
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do {
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/* Reset all the status bits. */
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GREG32(CRYPTO, INT_STATE) = -1;
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} while (GREG32(CRYPTO, INT_STATE) & 3);
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GREG32(CRYPTO, HOST_CMD) = 0x08000000 + adr; /* Call imem:adr. */
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event = task_wait_event_mask(TASK_EVENT_DCRYPTO_DONE,
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DCRYPTO_CALL_TIMEOUT_US);
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/* TODO(ngm): switch return value to an enum. */
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switch (event) {
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case TASK_EVENT_DCRYPTO_DONE:
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return 0;
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default:
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return 1;
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}
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}
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void __keep dcrypto_done_interrupt(void)
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{
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GREG32(CRYPTO, INT_STATE) = GC_CRYPTO_INT_STATE_HOST_CMD_DONE_MASK;
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task_clear_pending_irq(GC_IRQNUM_CRYPTO0_HOST_CMD_DONE_INT);
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task_set_event(my_task_id, TASK_EVENT_DCRYPTO_DONE, 0);
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}
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DECLARE_IRQ(GC_IRQNUM_CRYPTO0_HOST_CMD_DONE_INT, dcrypto_done_interrupt, 1);
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void dcrypto_imem_load(size_t offset, const uint32_t *opcodes,
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size_t n_opcodes)
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{
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size_t i;
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volatile uint32_t *ptr = GREG32_ADDR(CRYPTO, IMEM_DUMMY);
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ptr += offset;
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/* Check first word and copy all only if different. */
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if (ptr[0] != opcodes[0]) {
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for (i = 0; i < n_opcodes; ++i)
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ptr[i] = opcodes[i];
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}
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}
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void dcrypto_dmem_load(size_t offset, const void *words, size_t n_words)
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{
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size_t i;
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volatile uint32_t *ptr = GREG32_ADDR(CRYPTO, DMEM_DUMMY);
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const uint32_t *src = (const uint32_t *) words;
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struct access_helper *word_accessor = (struct access_helper *) src;
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ptr += offset * 8; /* Offset is in 256 bit addresses. */
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for (i = 0; i < n_words; ++i) {
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/*
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* The implementation of memcpy makes unaligned writes if src
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* is unaligned. DMEM on the other hand requires writes to be
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* aligned, so do a word-by-word copy manually here.
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*/
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ptr[i] = word_accessor[i].udata;
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}
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}
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