* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
+
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "mips32.h"
#include "mips_ejtag.h"
-int mips_ejtag_set_instr(struct mips_ejtag *ejtag_info, int new_instr, void *delete_me_and_submit_patch)
+void mips_ejtag_set_instr(struct mips_ejtag *ejtag_info, int new_instr)
{
struct jtag_tap *tap;
tap = ejtag_info->tap;
- if (tap == NULL)
- return ERROR_FAIL;
+ assert(tap != NULL);
- if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != (uint32_t)new_instr)
- {
+ if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != (uint32_t)new_instr) {
struct scan_field field;
uint8_t t[4];
field.num_bits = tap->ir_length;
field.out_value = t;
- buf_set_u32(field.out_value, 0, field.num_bits, new_instr);
+ buf_set_u32(t, 0, field.num_bits, new_instr);
field.in_value = NULL;
- jtag_add_ir_scan(tap, &field, jtag_get_end_state());
+ jtag_add_ir_scan(tap, &field, TAP_IDLE);
}
-
- return ERROR_OK;
}
int mips_ejtag_get_idcode(struct mips_ejtag *ejtag_info, uint32_t *idcode)
{
struct scan_field field;
+ uint8_t r[4];
- jtag_set_end_state(TAP_IDLE);
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE, NULL);
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IDCODE);
field.num_bits = 32;
field.out_value = NULL;
- field.in_value = (void*)idcode;
+ field.in_value = r;
jtag_add_dr_scan(ejtag_info->tap, 1, &field, TAP_IDLE);
- if (jtag_execute_queue() != ERROR_OK)
- {
+ int retval;
+ retval = jtag_execute_queue();
+ if (retval != ERROR_OK) {
LOG_ERROR("register read failed");
+ return retval;
}
+ *idcode = buf_get_u32(field.in_value, 0, 32);
+
return ERROR_OK;
}
-int mips_ejtag_get_impcode(struct mips_ejtag *ejtag_info, uint32_t *impcode)
+static int mips_ejtag_get_impcode(struct mips_ejtag *ejtag_info, uint32_t *impcode)
{
struct scan_field field;
+ uint8_t r[4];
- jtag_set_end_state(TAP_IDLE);
-
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE, NULL);
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_IMPCODE);
field.num_bits = 32;
field.out_value = NULL;
- field.in_value = (void*)impcode;
+ field.in_value = r;
jtag_add_dr_scan(ejtag_info->tap, 1, &field, TAP_IDLE);
- if (jtag_execute_queue() != ERROR_OK)
- {
+ int retval;
+ retval = jtag_execute_queue();
+ if (retval != ERROR_OK) {
LOG_ERROR("register read failed");
+ return retval;
}
+ *impcode = buf_get_u32(field.in_value, 0, 32);
+
return ERROR_OK;
}
{
struct jtag_tap *tap;
tap = ejtag_info->tap;
+ assert(tap != NULL);
- if (tap == NULL)
- return ERROR_FAIL;
struct scan_field field;
uint8_t t[4], r[4];
int retval;
field.num_bits = 32;
field.out_value = t;
- buf_set_u32(field.out_value, 0, field.num_bits, *data);
+ buf_set_u32(t, 0, field.num_bits, *data);
field.in_value = r;
- jtag_add_dr_scan(tap, 1, &field, jtag_get_end_state());
+ jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
+ retval = jtag_execute_queue();
+ if (retval != ERROR_OK) {
LOG_ERROR("register read failed");
return retval;
}
return ERROR_OK;
}
+void mips_ejtag_drscan_32_out(struct mips_ejtag *ejtag_info, uint32_t data)
+{
+ uint8_t t[4];
+ struct jtag_tap *tap;
+ tap = ejtag_info->tap;
+ assert(tap != NULL);
+
+ struct scan_field field;
+
+ field.num_bits = 32;
+ field.out_value = t;
+ buf_set_u32(t, 0, field.num_bits, data);
+
+ field.in_value = NULL;
+
+ jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
+}
+
int mips_ejtag_drscan_8(struct mips_ejtag *ejtag_info, uint32_t *data)
{
struct jtag_tap *tap;
tap = ejtag_info->tap;
+ assert(tap != NULL);
- if (tap == NULL)
- return ERROR_FAIL;
struct scan_field field;
uint8_t t[4] = {0, 0, 0, 0}, r[4];
int retval;
field.num_bits = 8;
field.out_value = t;
- buf_set_u32(field.out_value, 0, field.num_bits, *data);
+ buf_set_u32(t, 0, field.num_bits, *data);
field.in_value = r;
- jtag_add_dr_scan(tap, 1, &field, jtag_get_end_state());
+ jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
- if ((retval = jtag_execute_queue()) != ERROR_OK)
- {
+ retval = jtag_execute_queue();
+ if (retval != ERROR_OK) {
LOG_ERROR("register read failed");
return retval;
}
*data = buf_get_u32(field.in_value, 0, 32);
- keep_alive();
-
return ERROR_OK;
}
-int mips_ejtag_step_enable(struct mips_ejtag *ejtag_info)
+void mips_ejtag_drscan_8_out(struct mips_ejtag *ejtag_info, uint8_t data)
{
- static const uint32_t code[] = {
- MIPS32_MTC0(1,31,0), /* move $1 to COP0 DeSave */
- MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
- MIPS32_ORI(1,1,0x0100), /* set SSt bit in debug reg */
- MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
- MIPS32_B(NEG16(5)),
- MIPS32_MFC0(1,31,0), /* move COP0 DeSave to $1 */
- };
-
- mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, \
- 0, NULL, 0, NULL, 1);
+ struct jtag_tap *tap;
+ tap = ejtag_info->tap;
+ assert(tap != NULL);
- return ERROR_OK;
-}
-int mips_ejtag_step_disable(struct mips_ejtag *ejtag_info)
-{
- static const uint32_t code[] = {
- MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
- MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
- MIPS32_SW(1,0,15), /* sw $1,($15) */
- MIPS32_SW(2,0,15), /* sw $2,($15) */
- MIPS32_MFC0(1,23,0), /* move COP0 Debug to $1 */
- MIPS32_LUI(2,0xFFFF), /* $2 = 0xfffffeff */
- MIPS32_ORI(2,2,0xFEFF),
- MIPS32_AND(1,1,2),
- MIPS32_MTC0(1,23,0), /* move $1 to COP0 Debug */
- MIPS32_LW(2,0,15),
- MIPS32_LW(1,0,15),
- MIPS32_B(NEG16(13)),
- MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
- };
-
- mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, \
- 0, NULL, 0, NULL, 1);
+ struct scan_field field;
- return ERROR_OK;
+ field.num_bits = 8;
+ field.out_value = &data;
+ field.in_value = NULL;
+
+ jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
}
+/* Set (to enable) or clear (to disable stepping) the SSt bit (bit 8) in Cp0 Debug reg (reg 23, sel 0) */
int mips_ejtag_config_step(struct mips_ejtag *ejtag_info, int enable_step)
{
- if (enable_step)
- return mips_ejtag_step_enable(ejtag_info);
- return mips_ejtag_step_disable(ejtag_info);
+ int code_len = enable_step ? 6 : 7;
+
+ uint32_t *code = malloc(code_len * sizeof(uint32_t));
+ if (code == NULL) {
+ LOG_ERROR("Out of memory");
+ return ERROR_FAIL;
+ }
+ uint32_t *code_p = code;
+
+ *code_p++ = MIPS32_MTC0(1, 31, 0); /* move $1 to COP0 DeSave */
+ *code_p++ = MIPS32_MFC0(1, 23, 0), /* move COP0 Debug to $1 */
+ *code_p++ = MIPS32_ORI(1, 1, 0x0100); /* set SSt bit in debug reg */
+ if (!enable_step)
+ *code_p++ = MIPS32_XORI(1, 1, 0x0100); /* clear SSt bit in debug reg */
+
+ *code_p++ = MIPS32_MTC0(1, 23, 0); /* move $1 to COP0 Debug */
+ *code_p++ = MIPS32_B(NEG16((code_len - 1))); /* jump to start */
+ *code_p = MIPS32_MFC0(1, 31, 0); /* move COP0 DeSave to $1 */
+
+ int retval = mips32_pracc_exec(ejtag_info, code_len, code, 0, NULL, 0, NULL, 1);
+
+ free(code);
+ return retval;
}
int mips_ejtag_enter_debug(struct mips_ejtag *ejtag_info)
{
uint32_t ejtag_ctrl;
- jtag_set_end_state(TAP_IDLE);
- mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
+ mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL);
/* set debug break bit */
ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_JTAGBRK;
ejtag_ctrl = ejtag_info->ejtag_ctrl;
mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
LOG_DEBUG("ejtag_ctrl: 0x%8.8" PRIx32 "", ejtag_ctrl);
- if ((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0)
- LOG_DEBUG("Failed to enter Debug Mode!");
+ if ((ejtag_ctrl & EJTAG_CTRL_BRKST) == 0) {
+ LOG_ERROR("Failed to enter Debug Mode!");
+ return ERROR_FAIL;
+ }
return ERROR_OK;
}
inst = MIPS32_DRET;
/* execute our dret instruction */
- mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
-
- return ERROR_OK;
-}
-
-int mips_ejtag_read_debug(struct mips_ejtag *ejtag_info, uint32_t* debug_reg)
-{
- /* read ejtag ECR */
- static const uint32_t code[] = {
- MIPS32_MTC0(15,31,0), /* move $15 to COP0 DeSave */
- MIPS32_LUI(15,UPPER16(MIPS32_PRACC_STACK)), /* $15 = MIPS32_PRACC_STACK */
- MIPS32_ORI(15,15,LOWER16(MIPS32_PRACC_STACK)),
- MIPS32_SW(1,0,15), /* sw $1,($15) */
- MIPS32_SW(2,0,15), /* sw $2,($15) */
- MIPS32_LUI(1,UPPER16(MIPS32_PRACC_PARAM_OUT)), /* $1 = MIPS32_PRACC_PARAM_OUT */
- MIPS32_ORI(1,1,LOWER16(MIPS32_PRACC_PARAM_OUT)),
- MIPS32_MFC0(2,23,0), /* move COP0 Debug to $2 */
- MIPS32_SW(2,0,1),
- MIPS32_LW(2,0,15),
- MIPS32_LW(1,0,15),
- MIPS32_B(NEG16(12)),
- MIPS32_MFC0(15,31,0), /* move COP0 DeSave to $15 */
- };
-
- mips32_pracc_exec(ejtag_info, ARRAY_SIZE(code), code, \
- 0, NULL, 1, debug_reg, 1);
-
- return ERROR_OK;
+ return mips32_pracc_exec(ejtag_info, 1, &inst, 0, NULL, 0, NULL, 0);
}
int mips_ejtag_init(struct mips_ejtag *ejtag_info)
{
uint32_t ejtag_version;
+ int retval;
- mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
+ retval = mips_ejtag_get_impcode(ejtag_info, &ejtag_info->impcode);
+ if (retval != ERROR_OK)
+ return retval;
LOG_DEBUG("impcode: 0x%8.8" PRIx32 "", ejtag_info->impcode);
/* get ejtag version */
ejtag_version = ((ejtag_info->impcode >> 29) & 0x07);
- switch (ejtag_version)
- {
+ switch (ejtag_version) {
case 0:
LOG_DEBUG("EJTAG: Version 1 or 2.0 Detected");
break;
/* set initial state for ejtag control reg */
ejtag_info->ejtag_ctrl = EJTAG_CTRL_ROCC | EJTAG_CTRL_PRACC | EJTAG_CTRL_PROBEN | EJTAG_CTRL_SETDEV;
+ ejtag_info->fast_access_save = -1;
return ERROR_OK;
}
-int mips_ejtag_fastdata_scan(struct mips_ejtag *ejtag_info, int write, uint32_t *data)
+int mips_ejtag_fastdata_scan(struct mips_ejtag *ejtag_info, int write_t, uint32_t *data)
{
struct jtag_tap *tap;
- tap = ejtag_info->tap;
- if (tap == NULL)
- return ERROR_FAIL;
+ tap = ejtag_info->tap;
+ assert(tap != NULL);
struct scan_field fields[2];
uint8_t spracc = 0;
fields[1].num_bits = 32;
fields[1].out_value = t;
- if (write)
- {
+ if (write_t) {
fields[1].in_value = NULL;
buf_set_u32(t, 0, 32, *data);
- }
- else
- {
- fields[1].in_value = (uint8_t *) data;
- }
+ } else
+ fields[1].in_value = (void *) data;
+
+ jtag_add_dr_scan(tap, 2, fields, TAP_IDLE);
+
+ if (!write_t && data)
+ jtag_add_callback(mips_le_to_h_u32,
+ (jtag_callback_data_t) data);
- jtag_add_dr_scan(tap, 2, fields, jtag_get_end_state());
keep_alive();
return ERROR_OK;
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