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/*
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* Copyright (C) 2009-2010 Apple Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#include <arch.h>
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#include <arch/arm/arm.h>
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#include <debug.h>
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#include <drivers/a5iop/a5iop.h>
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#include <platform.h>
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#include <platform/int.h>
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#include <platform/timer.h>
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#include <sys/callout.h>
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#include <sys/task.h>
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/*
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* Cache control
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*/
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void
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a5iop_cache_operation(int operation, void *address, u_int32_t length)
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{
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uint32_t actual_base, lines, extra;
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if (unlikely(length == 0)) {
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enter_critical_section();
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if (operation & CACHE_CLEAN)
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arm_clean_dcache();
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if (operation & CACHE_INVALIDATE)
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arm_invalidate_dcache();
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exit_critical_section();
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/* on the panic path, disable the cache? XXX */
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if (operation & CACHE_PANIC) { }
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} else {
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actual_base = (uint32_t)address;
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ASSERT((actual_base & ~(CPU_CACHELINE_SIZE-1)) == actual_base);
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ASSERT((length % CPU_CACHELINE_SIZE) == 0);
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lines = length >> CPU_CACHELINE_SHIFT;
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ASSERT(lines > 0);
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extra = lines & 7;
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lines -= extra;
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/* perform loop unrolling to optimize multi-line operations rdar://problem/6722268 */
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if (operation & (CACHE_CLEAN | CACHE_INVALIDATE)) {
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switch (extra) {
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case 0:
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break;
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case 1:
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arm_clean_invalidate_dcache_line(actual_base);
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break;
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case 2:
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arm_clean_invalidate_dcache_line_2(actual_base);
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break;
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case 3:
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arm_clean_invalidate_dcache_line_3(actual_base);
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break;
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case 4:
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arm_clean_invalidate_dcache_line_4(actual_base);
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break;
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case 5:
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arm_clean_invalidate_dcache_line_5(actual_base);
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break;
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case 6:
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arm_clean_invalidate_dcache_line_6(actual_base);
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break;
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case 7:
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arm_clean_invalidate_dcache_line_7(actual_base);
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break;
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}
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actual_base += CPU_CACHELINE_SIZE * extra;
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while (lines) {
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arm_clean_invalidate_dcache_line_8(actual_base);
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lines -= 8;
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actual_base += CPU_CACHELINE_SIZE * 8;
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}
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} else if (operation & CACHE_CLEAN) {
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switch (extra) {
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case 0:
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break;
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case 1:
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arm_clean_dcache_line(actual_base);
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break;
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case 2:
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arm_clean_dcache_line_2(actual_base);
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break;
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case 3:
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arm_clean_dcache_line_3(actual_base);
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break;
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case 4:
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arm_clean_dcache_line_4(actual_base);
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break;
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case 5:
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arm_clean_dcache_line_5(actual_base);
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break;
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case 6:
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arm_clean_dcache_line_6(actual_base);
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break;
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case 7:
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arm_clean_dcache_line_7(actual_base);
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break;
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}
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actual_base += CPU_CACHELINE_SIZE * extra;
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while (lines) {
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arm_clean_dcache_line_8(actual_base);
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lines -= 8;
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actual_base += CPU_CACHELINE_SIZE * 8;
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}
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} else {// operation & CACHE_INVALIDATE
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switch (extra) {
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case 0:
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break;
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case 1:
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arm_invalidate_dcache_line(actual_base);
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break;
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case 2:
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arm_invalidate_dcache_line_2(actual_base);
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break;
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case 3:
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arm_invalidate_dcache_line_3(actual_base);
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break;
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case 4:
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arm_invalidate_dcache_line_4(actual_base);
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break;
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case 5:
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arm_invalidate_dcache_line_5(actual_base);
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break;
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case 6:
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arm_invalidate_dcache_line_6(actual_base);
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break;
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case 7:
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arm_invalidate_dcache_line_7(actual_base);
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break;
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}
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actual_base += CPU_CACHELINE_SIZE * extra;
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while (lines) {
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arm_invalidate_dcache_line_8(actual_base);
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lines -= 8;
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actual_base += CPU_CACHELINE_SIZE * 8;
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}
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}
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}
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}
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#if SUPPORT_SLEEP
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static struct task *sleeping_task;
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static u_int32_t idle_sleep;
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static u_int32_t powergate_cnt, powerwake_cnt, powerfall_cnt;
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static u_int32_t suspend_cnt, wake_cnt;
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static u_int64_t sleep_stamp, wake_stamp;
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extern u_int32_t arch_sleep_magic;
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void
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a5iop_sleep(u_int32_t going_idle)
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{
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idle_sleep = going_idle;
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if (idle_sleep)
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powergate_cnt++;
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else
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suspend_cnt++;
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/* disable interrupts; this is matched in the wake path */
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enter_critical_section();
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/* we are the sleeping task */
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sleeping_task = task_get_current_task();
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sleep_stamp = timer_get_ticks();
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/* fool the upcoming test on the sleep path */
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arch_sleep_magic = SLEEP_MAGIC_NOT_ASLEEP;
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/* save our current context - on wake we will return from this call */
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arch_task_context_switch(&sleeping_task->arch, &sleeping_task->arch);
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/* if we are on the wake path, go back */
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if (SLEEP_MAGIC_WAKEY_WAKEY == arch_sleep_magic) {
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RELEASE_ASSERT(powergate_cnt == powerfall_cnt + powerwake_cnt);
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RELEASE_ASSERT(suspend_cnt == wake_cnt);
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return;
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}
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/* flip the switch and wait for us to go to sleep */
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arch_sleep_magic = SLEEP_MAGIC_WAKEY_WAKEY;
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/* Flush and invalidate the the entire dcache
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* Don't call a5iop_cache_operation directly because the
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* irq_disable count won't get flushed */
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arm_clean_dcache();
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/* Use WFI to fully quiesce */
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arch_halt();
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if (idle_sleep) {
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/* It's possible to fall through the WFI without
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* power-gating, so carry on in that case. */
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powerfall_cnt++;
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exit_critical_section();
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} else {
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/* On the sleep/suspend path, it's not acceptible to
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* return from this routine. We don't expect to fall
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* through the WFI but better safe than sorry. */
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while (1) arch_halt();
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}
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}
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void
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platform_wakeup(void)
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{
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/* Reestablish the correct CPU configuration */
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arch_cpu_init(true);
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wake_stamp = timer_get_ticks();
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if (idle_sleep) {
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/* Waking from idle power-gating; timer and interrupt
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* state is intact; we just need to pop a level of IRQ
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* disable and start running. */
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powerwake_cnt++;
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exit_critical_section();
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} else {
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wake_cnt++;
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platform_early_init();
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}
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/* There should be a better abstracted way to enable NMI <rdar://problem/8269765> */
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arm_enable_fiqs();
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/* kick the callout system to re-evaluate deadlines */
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callout_reset_deadline();
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/* and switch back to the context that went to sleep */
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arch_task_context_restore(&sleeping_task->arch);
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panic("arch_task_context_restore didn't");
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}
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#endif /* SUPPORT_SLEEP */
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@@ -0,0 +1,25 @@
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/*
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* Copyright (C) 2010 Apple Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#ifndef __A5IOP_H
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#define __A5IOP_H
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#include <sys/types.h>
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__BEGIN_DECLS
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extern void a5iop_init(void);
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extern void a5iop_cache_operation(int operation, void *address, u_int32_t length);
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extern void a5iop_sleep(u_int32_t going_idle);
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__END_DECLS
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#endif
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@@ -0,0 +1,14 @@
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# Copyright (C) 2010 Apple Inc. All rights reserved.
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#
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# This document is the property of Apple Inc.
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||||
# It is considered confidential and proprietary.
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||||
#
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||||
# This document may not be reproduced or transmitted in any form,
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# in whole or in part, without the express written permission of
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# Apple Inc.
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#
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LOCAL_DIR := $(GET_LOCAL_DIR)
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ALL_OBJS += $(LOCAL_DIR)/a5iop.o
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GLOBAL_INCLUDES += $(LOCAL_DIR)/include
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