diff options
Diffstat (limited to 'src/jtag/drivers/ft2232.c')
| -rw-r--r-- | src/jtag/drivers/ft2232.c | 53 |
1 files changed, 39 insertions, 14 deletions
diff --git a/src/jtag/drivers/ft2232.c b/src/jtag/drivers/ft2232.c index 3cca26d9..ceb3c0b7 100644 --- a/src/jtag/drivers/ft2232.c +++ b/src/jtag/drivers/ft2232.c @@ -3175,40 +3175,65 @@ static int flossjtag_init(void) return ftx232_dbus_write(); } +/* + * The reference schematic from TI for the XDS100v2 has a CPLD on which opens + * the door for a number of different configurations + * + * Known Implementations: + * http://processors.wiki.ti.com/images/9/93/TMS570LS20216_USB_STICK_Schematic.pdf + * + * http://processors.wiki.ti.com/index.php/XDS100 (rev2) + * * CLPD logic: Rising edge to enable outputs (XDS100_PWR_RST) + * * ACBUS3 to transition 0->1 (OE rising edge) + * * CPLD logic: Put the EMU0/1 pins in Hi-Z: + * * ADBUS5/GPIOL1 = EMU_EN = 1 + * * ADBUS6/GPIOL2 = EMU0 = 0 + * * ACBUS4/SPARE0 = EMU1 = 0 + * * CPLD logic: Disable loopback + * * ACBUS6/SPARE2 = LOOPBACK = 0 + */ +#define XDS100_nEMU_EN (1<<5) +#define XDS100_nEMU0 (1<<6) + +#define XDS100_PWR_RST (1<<3) +#define XDS100_nEMU1 (1<<4) +#define XDS100_LOOPBACK (1<<6) static int xds100v2_init(void) { - low_output = 0x3A; - low_direction = 0x7B; + /* These are in the lower byte */ + nTRST = 0x10; + nTRSTnOE = 0x10; + + /* These aren't actually used on 14 pin connectors */ + /* These are in the upper byte */ + nSRST = 0x01; + nSRSTnOE = 0x01; + + low_output = 0x08 | nTRST | XDS100_nEMU_EN; + low_direction = 0x0b | nTRSTnOE | XDS100_nEMU_EN | XDS100_nEMU0; - /* initialize low byte for jtag */ if (ft2232_set_data_bits_low_byte(low_output,low_direction) != ERROR_OK) { LOG_ERROR("couldn't initialize FT2232 with 'xds100v2' layout"); return ERROR_JTAG_INIT_FAILED; } - nTRST = 0x10; - nTRSTnOE = 0x0; /* not output enable for nTRST */ - nSRST = 0x00; /* TODO: SRST is not supported yet */ - nSRSTnOE = 0x00; /* no output enable for nSRST */ - - high_output = 0x00; - high_direction = 0x59; + high_output = 0; + high_direction = nSRSTnOE | XDS100_LOOPBACK | XDS100_PWR_RST | XDS100_nEMU1; /* initialize high byte for jtag */ if (ft2232_set_data_bits_high_byte(high_output,high_direction) != ERROR_OK) { - LOG_ERROR("couldn't initialize FT2232 with 'xds100v2' layout"); + LOG_ERROR("couldn't put CPLD in to reset with 'xds100v2' layout"); return ERROR_JTAG_INIT_FAILED; } - high_output = 0x86; - high_direction = 0x59; + high_output |= XDS100_PWR_RST; /* initialize high byte for jtag */ if (ft2232_set_data_bits_high_byte(high_output,high_direction) != ERROR_OK) { - LOG_ERROR("couldn't initialize FT2232 with 'xds100v2' layout"); + LOG_ERROR("couldn't bring CPLD out of reset with 'xds100v2' layout"); return ERROR_JTAG_INIT_FAILED; } |