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PIC32: add software reset support

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The PIC32MX does not support the ejtag software reset - it is
optional in the ejtag spec.

We perform the equivalent using the microchip specific MTAP cmd's.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>
This commit is contained in:
Spencer Oliver
2010-03-16 12:54:08 +00:00
parent 79ca05b106
commit e7e9bfde47
4 changed files with 61 additions and 3 deletions
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26
src/target/mips_m4k.c
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@@ -250,11 +250,30 @@ int mips_m4k_assert_reset(struct target *target)
}
else
{
if (mips_m4k->is_pic32mx)
{
uint32_t mchip_cmd;
LOG_DEBUG("Using MTAP reset to reset processor...");
/* use microchip specific MTAP reset */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_MTAP, NULL);
mips_ejtag_set_instr(ejtag_info, MTAP_COMMAND, NULL);
mchip_cmd = MCHP_ASERT_RST;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
mchip_cmd = MCHP_DE_ASSERT_RST;
mips_ejtag_drscan_8(ejtag_info, &mchip_cmd);
mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP, NULL);
}
else
{
/* use ejtag reset - not supported by all cores */
uint32_t ejtag_ctrl = ejtag_info->ejtag_ctrl | EJTAG_CTRL_PRRST | EJTAG_CTRL_PERRST;
LOG_DEBUG("Using EJTAG reset (PRRST) to reset processor...");
mips_ejtag_set_instr(ejtag_info, EJTAG_INST_CONTROL, NULL);
mips_ejtag_drscan_32(ejtag_info, &ejtag_ctrl);
}
}
target->state = TARGET_RESET;
@@ -878,7 +897,7 @@ int mips_m4k_init_target(struct command_context *cmd_ctx, struct target *target)
int mips_m4k_init_arch_info(struct target *target, struct mips_m4k_common *mips_m4k,
struct jtag_tap *tap)
{
struct mips32_common *mips32 = &mips_m4k->mips32_common;
struct mips32_common *mips32 = &mips_m4k->mips32;
mips_m4k->common_magic = MIPSM4K_COMMON_MAGIC;
@@ -901,8 +920,8 @@ int mips_m4k_target_create(struct target *target, Jim_Interp *interp)
int mips_m4k_examine(struct target *target)
{
int retval;
struct mips32_common *mips32 = target_to_mips32(target);
struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
struct mips_m4k_common *mips_m4k = target_to_m4k(target);
struct mips_ejtag *ejtag_info = &mips_m4k->mips32.ejtag_info;
uint32_t idcode = 0;
if (!target_was_examined(target))
@@ -916,6 +935,7 @@ int mips_m4k_examine(struct target *target)
* as it is not selected by default */
mips_ejtag_set_instr(ejtag_info, MTAP_SW_ETAP, NULL);
LOG_DEBUG("PIC32MX Detected - using EJTAG Interface");
mips_m4k->is_pic32mx = true;
}
}