From d10f0def80f8837398b9176388ed6110fcebfd2d Mon Sep 17 00:00:00 2001 From: David Brownell <dbrownell@users.sourceforge.net> Date: Sun, 18 Jul 2010 17:29:25 -0400 Subject: comments for Luminary ICDI layout Provide $defines for more of the signals involved in the Luminary ICDI hardware, and comment some of what's going on. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> --- src/jtag/drivers/ft2232.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) (limited to 'src') diff --git a/src/jtag/drivers/ft2232.c b/src/jtag/drivers/ft2232.c index bf71fa32..4dcc045c 100644 --- a/src/jtag/drivers/ft2232.c +++ b/src/jtag/drivers/ft2232.c @@ -318,6 +318,9 @@ static const struct ft2232_layout *layout; /** default bitmask values ddriven on DBUS: TCK/TDI/TDO/TMS and GPIOL(0..4) */ static uint8_t low_output = 0x0; + +/* note that direction bit == 1 means that signal is an output */ + /** default direction bitmask for DBUS: TCK/TDI/TDO/TMS and GPIOL(0..4) */ static uint8_t low_direction = 0x0; /** default value bitmask for CBUS GPIOH(0..4) */ @@ -2492,13 +2495,34 @@ static int icdi_jtag_init(void) /* Most Luminary eval boards support SWO trace output, * and should use this "luminary_icdi" layout. + * + * DBUS 0..3 are used for JTAG as usual. GPIOs are used + * to switch between JTAG and SWD, or switch the ft2232 UART + * between (i) the target UART or (ii) SWO trace data. + * + * We come up in JTAG mode and may switch to SWD later (with + * SWO/trace option if SWD is active). + * + * DBUS == GPIO-Lx + * CBUS == GPIO-Hx */ + + +#define ICDI_JTAG_EN (1 << 7) /* ADBUS 7 (a.k.a. DBGMOD) */ +#define ICDI_DBG_ENn (1 << 6) /* ADBUS 6 */ +#define ICDI_SRST (1 << 5) /* ADBUS 5 */ +#define ICDI_TDI (1 << 2) /* ADBUS 2 (INPUT) */ + +#define ICDI_SWO_EN (1 << 4) /* BDBUS 4 */ +#define ICDI_TX_SWO (1 << 1) /* BDBUS 1 */ + nTRST = 0x0; nTRSTnOE = 0x00; - nSRST = 0x20; + nSRST = ICDI_SRST; nSRSTnOE = 0x20; - low_output = 0x88; - low_direction = 0xcb; + + low_output = 0x08 | ICDI_JTAG_EN; + low_direction = 0xcb | ICDI_JTAG_EN; return ftx232_dbus_write(); } -- cgit v1.2.3