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/*
* Copyright (c) 2013, 2016 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems/score/smpimpl.h>
#include <libfdt.h>
#include <libcpu/powerpc-utility.h>
#include <bsp.h>
#include <bsp/fdt.h>
#include <bsp/mmu.h>
#include <bsp/fatal.h>
#include <bsp/qoriq.h>
#include <bsp/vectors.h>
#include <bsp/bootcard.h>
#include <bsp/irq-generic.h>
#include <bsp/linker-symbols.h>
LINKER_SYMBOL(bsp_exc_vector_base);
#if QORIQ_THREAD_COUNT > 1
void _start_thread(void);
#endif
void _start_secondary_processor(void);
#define IPI_INDEX 0
#define TLB_BEGIN (3 * QORIQ_TLB1_ENTRY_COUNT / 4)
#define TLB_END QORIQ_TLB1_ENTRY_COUNT
#define TLB_COUNT (TLB_END - TLB_BEGIN)
#if QORIQ_THREAD_COUNT > 1
static bool is_started_by_u_boot(uint32_t cpu_index)
{
return cpu_index % QORIQ_THREAD_COUNT == 0;
}
void qoriq_start_thread(void)
{
const Per_CPU_Control *cpu_self = _Per_CPU_Get();
ppc_exc_initialize_interrupt_stack(
(uintptr_t) cpu_self->interrupt_stack_low,
rtems_configuration_get_interrupt_stack_size()
);
bsp_interrupt_facility_initialize();
_SMP_Start_multitasking_on_secondary_processor();
}
#endif
static void start_thread_if_necessary(uint32_t cpu_index_self)
{
#if QORIQ_THREAD_COUNT > 1
uint32_t i;
for (i = 1; i < QORIQ_THREAD_COUNT; ++i) {
uint32_t cpu_index_next = cpu_index_self + i;
if (
is_started_by_u_boot(cpu_index_self)
&& cpu_index_next < rtems_configuration_get_maximum_processors()
&& _SMP_Should_start_processor(cpu_index_next)
) {
/* Thread Initial Next Instruction Address (INIA) */
PPC_SET_THREAD_MGMT_REGISTER(321, (uint32_t) _start_thread);
/* Thread Initial Machine State (IMSR) */
PPC_SET_THREAD_MGMT_REGISTER(289, QORIQ_INITIAL_MSR);
/* Thread Enable Set (TENS) */
PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_TENS, 1U << i);
}
}
#endif
}
void bsp_start_on_secondary_processor(void)
{
uint32_t cpu_index_self = _SMP_Get_current_processor();
const Per_CPU_Control *cpu_self = _Per_CPU_Get_by_index(cpu_index_self);
ppc_exc_initialize_with_vector_base(
(uintptr_t) cpu_self->interrupt_stack_low,
rtems_configuration_get_interrupt_stack_size(),
bsp_exc_vector_base
);
/* Now it is possible to make the code execute only */
qoriq_mmu_change_perm(
FSL_EIS_MAS3_SR | FSL_EIS_MAS3_SX,
FSL_EIS_MAS3_SX,
FSL_EIS_MAS3_SR
);
bsp_interrupt_facility_initialize();
start_thread_if_necessary(cpu_index_self);
_SMP_Start_multitasking_on_secondary_processor();
}
static void bsp_inter_processor_interrupt(void *arg)
{
_SMP_Inter_processor_interrupt_handler();
}
static uint32_t discover_processors(void)
{
const void *fdt = bsp_fdt_get();
int cpus = fdt_path_offset(fdt, "/cpus");
int node = fdt_first_subnode(fdt, cpus);
uint32_t cpu = 0;
while (node >= 0 && cpu < RTEMS_ARRAY_SIZE(qoriq_start_spin_table_addr)) {
int len;
fdt64_t *addr_fdt = (fdt64_t *)
fdt_getprop(fdt, node, "cpu-release-addr", &len);
if (addr_fdt != NULL) {
uintptr_t addr = (uintptr_t) fdt64_to_cpu(*addr_fdt);
qoriq_start_spin_table_addr[cpu] = (qoriq_start_spin_table *) addr;
}
++cpu;
node = fdt_next_subnode(fdt, node);
}
return cpu * QORIQ_THREAD_COUNT;
}
uint32_t _CPU_SMP_Initialize(void)
{
uint32_t cpu_count = 1;
if (rtems_configuration_get_maximum_processors() > 0) {
cpu_count = discover_processors();
}
start_thread_if_necessary(0);
return cpu_count;
}
static bool release_processor(
qoriq_start_spin_table *spin_table,
uint32_t cpu_index
)
{
bool spin_table_present = (spin_table != NULL);
if (spin_table_present) {
const Per_CPU_Control *cpu = _Per_CPU_Get_by_index(cpu_index);
spin_table->pir = cpu_index;
spin_table->r3_lower = (uint32_t) cpu->interrupt_stack_high;
spin_table->addr_upper = 0;
rtems_cache_flush_multiple_data_lines(spin_table, sizeof(*spin_table));
ppc_synchronize_data();
spin_table->addr_lower = (uint32_t) _start_secondary_processor;
rtems_cache_flush_multiple_data_lines(spin_table, sizeof(*spin_table));
}
return spin_table_present;
}
static qoriq_start_spin_table *get_spin_table(uint32_t cpu_index)
{
qoriq_start_spin_table *spin_table;
spin_table = qoriq_start_spin_table_addr[cpu_index / QORIQ_THREAD_COUNT];
return spin_table;
}
bool _CPU_SMP_Start_processor(uint32_t cpu_index)
{
#if QORIQ_THREAD_COUNT > 1
if (is_started_by_u_boot(cpu_index)) {
qoriq_start_spin_table *spin_table = get_spin_table(cpu_index);
return release_processor(spin_table, cpu_index);
} else {
return _SMP_Should_start_processor(cpu_index - 1);
}
#else
qoriq_start_spin_table *spin_table = get_spin_table(cpu_index);
return release_processor(spin_table, cpu_index);
#endif
}
void _CPU_SMP_Finalize_initialization(uint32_t cpu_count)
{
if (cpu_count > 1) {
rtems_status_code sc;
sc = rtems_interrupt_handler_install(
QORIQ_IRQ_IPI_0 + IPI_INDEX,
"IPI",
RTEMS_INTERRUPT_UNIQUE,
bsp_inter_processor_interrupt,
NULL
);
if (sc != RTEMS_SUCCESSFUL) {
bsp_fatal(QORIQ_FATAL_SMP_IPI_HANDLER_INSTALL);
}
}
}
void _CPU_SMP_Prepare_start_multitasking(void)
{
/* Do nothing */
}
void _CPU_SMP_Send_interrupt(uint32_t target_processor_index)
{
qoriq.pic.ipidr [IPI_INDEX].reg = 1U << target_processor_index;
}
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