def decode(idcode):
"""decode the JTAG idcode, return a string"""
version = util.bits(idcode, (31, 28))
part = util.bits(idcode, (27, 12))
mfg = util.bits(idcode, (11, 1))
s = []
s.append('idcode 0x%08x' % idcode)
s.append('mfg 0x%03x (%s)' % (mfg, mfg_name(mfg)))
s.append('part 0x%04x' % part)
s.append('ver 0x%x' % version)
if util.bits(idcode, (0,)) != 1:
s.append('leading bit != 1')
return ' '.join(s)
def idr_decode(idr):
"""return a string for the IDR decode"""
rev = util.bits(idr, (31, 28))
jedec_cont = util.bits(idr, (27, 24))
jedec_id = util.bits(idr, (23, 17))
ap_class = util.bits(idr, (16, 13))
ap_variant = util.bits(idr, (7, 4))
ap_type = util.bits(idr, (3, 0))
s = []
if jedec_cont == 0x4 and jedec_id == 0x3b:
jedec_name = 'ARM'
else:
jedec_name = '?'
ap_name = {
AP_TYPE_JTAG: 'JTAG',
AP_TYPE_AHB: 'AHB',
AP_TYPE_APB: 'APB',
AP_TYPE_AXI: 'AXI',
}
class_name = {
AP_CLASS_NONE: 'NONE',
AP_CLASS_MEM_AP: 'MEM-AP',
}
s.append('idr 0x%08x' % idr)
s.append('rev %x' % rev)
s.append('jedec %x:%x (%s)' % (jedec_cont, jedec_id, jedec_name))
s.append('class %x (%s)' % (ap_class, class_name.get(ap_class, '?')))
s.append('ap %x:%x (%s)' %
(ap_variant, ap_type, ap_name.get(ap_type, '?')))
return ' '.join(s)
def is_jtag_ap(idr):
"""return True if this IDR is for a JTAG-AP"""
ap_class = util.bits(idr, (16, 13))
ap_type = util.bits(idr, (3, 0))
return ap_class == AP_CLASS_NONE and ap_type == AP_TYPE_JTAG
def is_mem_ap(idr):
"""return True if this IDR is for a MEM-AP"""
ap_class = util.bits(idr, (16, 13))
return ap_class == AP_CLASS_MEM_AP