batch.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "batch.h"
#include "debug_defines.h"
#include "riscv.h"
 
#define get_field(reg, mask) (((reg) & (mask)) / ((mask) & ~((mask) << 1)))
#define set_field(reg, mask, val) (((reg) & ~(mask)) | (((val) * ((mask) & ~((mask) << 1))) & (mask)))
 
#define DTM_DMI_MAX_ADDRESS_LENGTH  ((1<<DTM_DTMCS_ABITS_LENGTH)-1)
#define DMI_SCAN_MAX_BIT_LENGTH (DTM_DMI_MAX_ADDRESS_LENGTH + DTM_DMI_DATA_LENGTH + DTM_DMI_OP_LENGTH)
#define DMI_SCAN_BUF_SIZE (DIV_ROUND_UP(DMI_SCAN_MAX_BIT_LENGTH, 8))
 
static void dump_field(int idle, const struct scan_field *field);
 
struct riscv_batch *riscv_batch_alloc(struct target *target, size_t scans, size_t idle)
{
    scans += 4;
    struct riscv_batch *out = calloc(1, sizeof(*out));
    if (!out)
        goto error0;
    out->target = target;
    out->allocated_scans = scans;
    out->idle_count = idle;
    out->data_out = malloc(sizeof(*out->data_out) * (scans) * DMI_SCAN_BUF_SIZE);
    if (!out->data_out) {
        LOG_ERROR("Failed to allocate data_out in RISC-V batch.");
        goto error1;
    };
    out->data_in = malloc(sizeof(*out->data_in) * (scans) * DMI_SCAN_BUF_SIZE);
    if (!out->data_in) {
        LOG_ERROR("Failed to allocate data_in in RISC-V batch.");
        goto error2;
    }
    out->fields = malloc(sizeof(*out->fields) * (scans));
    if (!out->fields) {
        LOG_ERROR("Failed to allocate fields in RISC-V batch.");
        goto error3;
    }
    if (bscan_tunnel_ir_width != 0) {
        out->bscan_ctxt = malloc(sizeof(*out->bscan_ctxt) * (scans));
        if (!out->bscan_ctxt) {
            LOG_ERROR("Failed to allocate bscan_ctxt in RISC-V batch.");
            goto error4;
        }
    }
    out->last_scan = RISCV_SCAN_TYPE_INVALID;
    out->read_keys = malloc(sizeof(*out->read_keys) * (scans));
    if (!out->read_keys) {
        LOG_ERROR("Failed to allocate read_keys in RISC-V batch.");
        goto error5;
    }
    return out;
 
error5:
    free(out->bscan_ctxt);
error4:
    free(out->fields);
error3:
    free(out->data_in);
error2:
    free(out->data_out);
error1:
    free(out);
error0:
    return NULL;
}
 
void riscv_batch_free(struct riscv_batch *batch)
{
    free(batch->data_in);
    free(batch->data_out);
    free(batch->fields);
    free(batch->bscan_ctxt);
    free(batch->read_keys);
    free(batch);
}
 
bool riscv_batch_full(struct riscv_batch *batch)
{
    return batch->used_scans > (batch->allocated_scans - 4);
}
 
int riscv_batch_run(struct riscv_batch *batch)
{
    if (batch->used_scans == 0) {
        LOG_DEBUG("Ignoring empty batch.");
        return ERROR_OK;
    }
 
    riscv_batch_add_nop(batch);
 
    for (size_t i = 0; i < batch->used_scans; ++i) {
        if (bscan_tunnel_ir_width != 0)
            riscv_add_bscan_tunneled_scan(batch->target, batch->fields+i, batch->bscan_ctxt+i);
        else
            jtag_add_dr_scan(batch->target->tap, 1, batch->fields + i, TAP_IDLE);
 
        if (batch->idle_count > 0)
            jtag_add_runtest(batch->idle_count, TAP_IDLE);
    }
 
    keep_alive();
 
    if (jtag_execute_queue() != ERROR_OK) {
        LOG_ERROR("Unable to execute JTAG queue");
        return ERROR_FAIL;
    }
 
    keep_alive();
 
    if (bscan_tunnel_ir_width != 0) {
        /* need to right-shift "in" by one bit, because of clock skew between BSCAN TAP and DM TAP */
        for (size_t i = 0; i < batch->used_scans; ++i)
            buffer_shr((batch->fields + i)->in_value, DMI_SCAN_BUF_SIZE, 1);
    }
 
    for (size_t i = 0; i < batch->used_scans; ++i)
        dump_field(batch->idle_count, batch->fields + i);
 
    return ERROR_OK;
}
 
void riscv_batch_add_dmi_write(struct riscv_batch *batch, unsigned address, uint64_t data)
{
    assert(batch->used_scans < batch->allocated_scans);
    struct scan_field *field = batch->fields + batch->used_scans;
    field->num_bits = riscv_dmi_write_u64_bits(batch->target);
    field->out_value = (void *)(batch->data_out + batch->used_scans * DMI_SCAN_BUF_SIZE);
    field->in_value  = (void *)(batch->data_in  + batch->used_scans * DMI_SCAN_BUF_SIZE);
    riscv_fill_dmi_write_u64(batch->target, (char *)field->out_value, address, data);
    riscv_fill_dmi_nop_u64(batch->target, (char *)field->in_value);
    batch->last_scan = RISCV_SCAN_TYPE_WRITE;
    batch->used_scans++;
}
 
size_t riscv_batch_add_dmi_read(struct riscv_batch *batch, unsigned address)
{
    assert(batch->used_scans < batch->allocated_scans);
    struct scan_field *field = batch->fields + batch->used_scans;
    field->num_bits = riscv_dmi_write_u64_bits(batch->target);
    field->out_value = (void *)(batch->data_out + batch->used_scans * DMI_SCAN_BUF_SIZE);
    field->in_value  = (void *)(batch->data_in  + batch->used_scans * DMI_SCAN_BUF_SIZE);
    riscv_fill_dmi_read_u64(batch->target, (char *)field->out_value, address);
    riscv_fill_dmi_nop_u64(batch->target, (char *)field->in_value);
    batch->last_scan = RISCV_SCAN_TYPE_READ;
    batch->used_scans++;
 
    batch->read_keys[batch->read_keys_used] = batch->used_scans;
    return batch->read_keys_used++;
}
 
unsigned riscv_batch_get_dmi_read_op(struct riscv_batch *batch, size_t key)
{
    assert(key < batch->read_keys_used);
    size_t index = batch->read_keys[key];
    assert(index <= batch->used_scans);
    uint8_t *base = batch->data_in + DMI_SCAN_BUF_SIZE * index;
    /* extract "op" field from the DMI read result */
    return (unsigned)buf_get_u32(base, DTM_DMI_OP_OFFSET, DTM_DMI_OP_LENGTH);
}
 
uint32_t riscv_batch_get_dmi_read_data(struct riscv_batch *batch, size_t key)
{
    assert(key < batch->read_keys_used);
    size_t index = batch->read_keys[key];
    assert(index <= batch->used_scans);
    uint8_t *base = batch->data_in + DMI_SCAN_BUF_SIZE * index;
    /* extract "data" field from the DMI read result */
    return buf_get_u32(base, DTM_DMI_DATA_OFFSET, DTM_DMI_DATA_LENGTH);
}
 
void riscv_batch_add_nop(struct riscv_batch *batch)
{
    assert(batch->used_scans < batch->allocated_scans);
    struct scan_field *field = batch->fields + batch->used_scans;
    field->num_bits = riscv_dmi_write_u64_bits(batch->target);
    field->out_value = (void *)(batch->data_out + batch->used_scans * DMI_SCAN_BUF_SIZE);
    field->in_value  = (void *)(batch->data_in  + batch->used_scans * DMI_SCAN_BUF_SIZE);
    riscv_fill_dmi_nop_u64(batch->target, (char *)field->out_value);
    riscv_fill_dmi_nop_u64(batch->target, (char *)field->in_value);
    batch->last_scan = RISCV_SCAN_TYPE_NOP;
    batch->used_scans++;
}
 
void dump_field(int idle, const struct scan_field *field)
{
    static const char * const op_string[] = {"-", "r", "w", "?"};
    static const char * const status_string[] = {"+", "?", "F", "b"};
 
    if (debug_level < LOG_LVL_DEBUG)
        return;
 
    assert(field->out_value);
    uint64_t out = buf_get_u64(field->out_value, 0, field->num_bits);
    unsigned int out_op = get_field(out, DTM_DMI_OP);
    unsigned int out_data = get_field(out, DTM_DMI_DATA);
    unsigned int out_address = out >> DTM_DMI_ADDRESS_OFFSET;
 
    if (field->in_value) {
        uint64_t in = buf_get_u64(field->in_value, 0, field->num_bits);
        unsigned int in_op = get_field(in, DTM_DMI_OP);
        unsigned int in_data = get_field(in, DTM_DMI_DATA);
        unsigned int in_address = in >> DTM_DMI_ADDRESS_OFFSET;
 
        log_printf_lf(LOG_LVL_DEBUG,
                __FILE__, __LINE__, __PRETTY_FUNCTION__,
                "%db %s %08x @%02x -> %s %08x @%02x; %di",
                field->num_bits, op_string[out_op], out_data, out_address,
                status_string[in_op], in_data, in_address, idle);
    } else {
        log_printf_lf(LOG_LVL_DEBUG,
                __FILE__, __LINE__, __PRETTY_FUNCTION__, "%db %s %08x @%02x -> ?; %di",
                field->num_bits, op_string[out_op], out_data, out_address, idle);
    }
}
 
size_t riscv_batch_available_scans(struct riscv_batch *batch)
{
    return batch->allocated_scans - batch->used_scans - 4;
}