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/*
* Copyright (c) 2011-2013 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.
*/
#define NDEBUG
#include <bsp/ata.h>
#include <libcpu/powerpc-utility.h>
#include <bsp.h>
#include <bsp/fatal.h>
#include <bsp/irq.h>
typedef enum {
DATA_CURRENT = 0,
DATA_END,
DATA_REG
} variables;
typedef enum {
INC_0_NE = 0,
INC_2_NE
} increments;
/*
* for
* idx0 = DATA_CURRENT, idx1 = DATA_REG
* idx0 != DATA_END
* idx0 += 2, idx1 += 0
* do
* *idx0 = *idx1 [INT, 16 bit] OR *idx1 = *idx0 [INT, 16 bit]
*/
static const uint32_t ops[] = {
LCD(0, VAR(DATA_CURRENT), 0, VAR(DATA_REG), TERM_FIRST, VAR(DATA_END), INC_2_NE, INC_0_NE),
0, /* Transfer opcode, see transfer() */
};
static bool is_last_transfer(const ata_driver_dma_pio_single *self)
{
return self->transfer_current + 1 == self->transfer_end;
}
static void start_sector_transfer(ata_driver_dma_pio_single *self)
{
uint16_t *current = ata_sg_get_sector_data_begin(&self->sg_context, self->transfer_current);
bestcomm_task_set_variable(&self->task, DATA_CURRENT, (uint32_t) current);
bestcomm_task_set_variable(&self->task, DATA_END, (uint32_t) ata_sg_get_sector_data_end(&self->sg_context, current));
bestcomm_task_start(&self->task);
bool last = is_last_transfer(self);
++self->transfer_current;
if (!last) {
ata_flush_sector(ata_sg_get_sector_data_begin(&self->sg_context, self->transfer_current));
}
}
static void dma_pio_single_interrupt_handler(void *arg)
{
ata_driver_dma_pio_single *self = arg;
bool ok = ata_check_status();
bool send_event = false;
if (ok && self->transfer_current != self->transfer_end) {
bool enable_dma_interrupt = self->read && is_last_transfer(self);
if (enable_dma_interrupt) {
bestcomm_task_irq_clear(&self->task);
bestcomm_task_irq_enable(&self->task);
}
start_sector_transfer(self);
} else {
send_event = true;
}
if (send_event) {
bestcomm_task_wakeup_event_task(&self->task);
}
}
static bool transfer_dma_pio_single(ata_driver *super, bool read, rtems_blkdev_sg_buffer *sg, size_t sg_count)
{
bool ok = true;
ata_driver_dma_pio_single *self = (ata_driver_dma_pio_single *) super;
self->read = read;
ata_sg_reset(&self->sg_context, sg, sg_count);
rtems_blkdev_bnum start_sector = ata_sg_get_start_sector(&self->sg_context);
rtems_blkdev_bnum sector_count = ata_sg_get_sector_count(&self->sg_context);
rtems_blkdev_bnum relative_sector = 0;
ata_flush_sector(ata_sg_get_sector_data_begin(&self->sg_context, relative_sector));
uint8_t command = ata_read_or_write_sectors_command(read);
uint32_t opcode;
if (read) {
opcode = DRD1A(INT, INIT_ALWAYS, DEST_DEREF_IDX(0), SZ_16, SRC_DEREF_IDX(1), SZ_16);
} else {
opcode = DRD1A(INT, INIT_ALWAYS, DEST_DEREF_IDX(1), SZ_16, SRC_DEREF_IDX(0), SZ_16);
}
bestcomm_task_irq_disable(&self->task);
bestcomm_task_associate_with_current_task(&self->task);
size_t transfer_opcode_index = 1; /* See ops */
bestcomm_task_set_opcode(&self->task, transfer_opcode_index, opcode);
while (ok && relative_sector < sector_count) {
rtems_blkdev_bnum remaining_sectors = sector_count - relative_sector;
rtems_blkdev_bnum transfer_count = ata_max_transfer_count(remaining_sectors);
self->transfer_current = relative_sector;
self->transfer_end = relative_sector + transfer_count;
ok = ata_execute_io_command(command, start_sector + relative_sector, transfer_count);
if (ok) {
if (!read) {
ok = ata_wait_for_data_request();
assert(ok);
rtems_interrupt_level level;
rtems_interrupt_disable(level);
start_sector_transfer(self);
rtems_interrupt_enable(level);
}
bestcomm_task_wait(&self->task);
ok = ata_check_status();
relative_sector += ATA_PER_TRANSFER_SECTOR_COUNT_MAX;
}
}
return ok;
}
static int io_control_dma_pio_single(
rtems_disk_device *dd,
uint32_t cmd,
void *arg
)
{
return ata_driver_io_control(dd, cmd, arg, transfer_dma_pio_single);
}
void ata_driver_dma_pio_single_create(ata_driver_dma_pio_single *self, const char *device_file_path, TaskId task_index)
{
ata_driver_create(&self->super, device_file_path, io_control_dma_pio_single);
self->read = false;
if (ata_driver_is_card_present(&self->super)) {
bestcomm_task_create_and_load(&self->task, task_index, ops, sizeof(ops));
bestcomm_task_set_variable(&self->task, DATA_REG, (uint32_t) &ATA->write.data);
bestcomm_task_set_increment_and_condition(&self->task, INC_0_NE, 0, COND_NE);
bestcomm_task_set_increment_and_condition(&self->task, INC_2_NE, 2, COND_NE);
bestcomm_task_enable_combined_write(&self->task, true);
bestcomm_task_enable_read_buffer(&self->task, true);
bestcomm_task_enable_speculative_read(&self->task, true);
ata_clear_interrupts();
rtems_status_code sc = rtems_interrupt_handler_install(
BSP_SIU_IRQ_ATA,
"ATA",
RTEMS_INTERRUPT_UNIQUE,
dma_pio_single_interrupt_handler,
self
);
if (sc != RTEMS_SUCCESSFUL) {
bsp_fatal(MPC5200_FATAL_ATA_DMA_SINGLE_IRQ_INSTALL);
}
}
}
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