[flashrom] [PATCH] Added support to control the GPIOs in the ft222_spi driver from the command line
Reggie McMurtrey
reggie.mcmurtrey at gmail.com
Sat Feb 21 01:21:09 CET 2015
This is my first time submitting a patch to a project, so let me know
if I have done something wrong here.
I commonly use the C232HM cable from FTDI to program various parts of
boards I design. This one cable allows me to program SPI, I2C, and
JTAG parts. Simply adding some muxes to the design I have a single
header to attach this cable to. The patch below allows control of the
muxes from the GPIOL3-GPIOL0 signals on the cable and disable write
protection. I figured other people may like this capability if they
are using a similar breakout cable of have designed the ft2232 chip
into their design.
Signed-off-by: Reggie McMurtrey <reggie.mcmurtrey at gmail.com>
*---
flashrom.8.tmpl | 17 ++++++++++++++++
ft2232_spi.c | 61 ++++++++++++++++++++++++++++++++++++++++-----------------
2 files changed, 60 insertions(+), 18 deletions(-)
diff --git a/flashrom.8.tmpl b/flashrom.8.tmpl
index 8b5f98c..40d8d84 100644
--- a/flashrom.8.tmpl
+++ b/flashrom.8.tmpl
@@ -681,6 +681,23 @@ parameter with the
.B " flashrom \-p ft2232_spi:divisor=div"
.sp
syntax.
+.sp
+If the ft2232_spi device has been integrated into a custom board, or
you are using a breakout cable
+like the C232HM cable from FTDI you can control the upper bits of the
port ( bits 7-4 ) via the
+.sp
+.B " flashrom \-p ft2232_spi:gpio_dir=dir,gpio_value=value"
+.sp
+syntax where
+.B dir
+is a mask defining the directions of the port's upper bits.
+.B value
+is the value of the bits for the port. Only bits defined as outputs with the
+.B dir
+argument are affected. For example
+.B gpio_dir=0xf0,gpio_value=0x80
+would set the four upper bits of the port as outputs with bit 7 as
high, and bits 6 through 4 as
+low. This could be useful for controlling write protects, muxing
options, or other in
+circuit programming related features.
.SS
.BR "serprog " programmer
A mandatory parameter specifies either a serial
diff --git a/ft2232_spi.c b/ft2232_spi.c
index 4e23797..c7a78fe 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -93,6 +93,9 @@ const struct dev_entry devs_ft2232spi[] = {
*/
static uint8_t cs_bits = 0x08;
static uint8_t pindir = 0x0b;
+static uint8_t gpio_dir = 0x00;
+static uint8_t gpio_value = 0x00;
+static uint8_t adapter_mask = 0x00;
static struct ftdi_context ftdic_context;
static const char *get_ft2232_devicename(int ft2232_vid, int ft2232_type)
@@ -204,10 +207,11 @@ int ft2232_spi_init(void)
ft2232_type = AMONTEC_JTAGKEY_PID;
channel_count = 2;
/* JTAGkey(2) needs to enable its output via Bit4 / GPIOL0
- * value: 0x18 OE=high, CS=high, DI=low, DO=low, SK=low
- * dir: 0x1b OE=output, CS=output, DI=input, DO=output, SK=output */
- cs_bits = 0x18;
- pindir = 0x1b;
+ * value: 0x10 OE=high, Reserved (CS), Reserved (DI), Reserved
(DO), Reserved (SK)
+ * dir: 0x10 OE=output, Reserved (CS), Reserved (DI), Reserved
(DO), Reserved (SK) */
+ gpio_dir = 0x10;
+ gpio_value = 0x10;
+ adapter_mask = 0x10;
} else if (!strcasecmp(arg, "picotap")) {
ft2232_vid = GOEPEL_VID;
ft2232_type = GOEPEL_PICOTAP_PID;
@@ -224,8 +228,9 @@ int ft2232_spi_init(void)
/* In its default configuration it is a jtagkey clone */
ft2232_type = FTDI_FT2232H_PID;
channel_count = 2;
- cs_bits = 0x18;
- pindir = 0x1b;
+ gpio_dir = 0x10;
+ gpio_value = 0x10;
+ adapter_mask = 0x10;
} else if (!strcasecmp(arg, "openmoko")) {
ft2232_vid = FIC_VID;
ft2232_type = OPENMOKO_DBGBOARD_PID;
@@ -235,10 +240,11 @@ int ft2232_spi_init(void)
ft2232_type = OLIMEX_ARM_OCD_PID;
channel_count = 2;
/* arm-usb-ocd(-h) has an output buffer that needs to be enabled
by pulling ADBUS4 low.
- * value: 0x08 #OE=low, CS=high, DI=low, DO=low, SK=low
- * dir: 0x1b #OE=output, CS=output, DI=input, DO=output, SK=output */
- cs_bits = 0x08;
- pindir = 0x1b;
+ * value: 0x00 #OE=low, Reserved (CS), Reserved (DI), Reserved
(DO), Reserved (SK)
+ * dir: 0x10 #OE=output, Reserved (CS), Reserved (DI), Reserved
(DO), Reserved (SK) */
+ gpio_dir = 0x10;
+ gpio_value = 0x00;
+ adapter_mask = 0x10;
} else if (!strcasecmp(arg, "arm-usb-tiny")) {
ft2232_vid = OLIMEX_VID;
ft2232_type = OLIMEX_ARM_TINY_PID;
@@ -248,8 +254,9 @@ int ft2232_spi_init(void)
ft2232_type = OLIMEX_ARM_OCD_H_PID;
channel_count = 2;
/* See arm-usb-ocd */
- cs_bits = 0x08;
- pindir = 0x1b;
+ gpio_dir = 0x10;
+ gpio_value = 0x00;
+ adapter_mask = 0x10;
} else if (!strcasecmp(arg, "arm-usb-tiny-h")) {
ft2232_vid = OLIMEX_VID;
ft2232_type = OLIMEX_ARM_TINY_H_PID;
@@ -262,6 +269,18 @@ int ft2232_spi_init(void)
}
free(arg);
+ arg = extract_programmer_param("gpio_dir");
+ if (arg) {
+ gpio_dir = (strtoul(arg, 0, 16) & (0xf0 & ~adapter_mask)) | gpio_dir;
+ }
+ free(arg);
+
+ arg = extract_programmer_param("gpio_value");
+ if (arg) {
+ gpio_value = (strtoul(arg, 0, 16) & (0xf0 & ~adapter_mask)) | gpio_value;
+ }
+ free(arg);
+
arg = extract_programmer_param("port");
if (arg) {
switch (toupper((unsigned char)*arg)) {
@@ -391,9 +410,11 @@ int ft2232_spi_init(void)
}
msg_pdbg("Set data bits\n");
+ msg_pspew("Value: 0x%02x\n", cs_bits | gpio_value);
+ msg_pspew("Dir: 0x%02x\n", pindir | gpio_dir);
buf[0] = SET_BITS_LOW;
- buf[1] = cs_bits;
- buf[2] = pindir;
+ buf[1] = cs_bits | gpio_value;
+ buf[2] = pindir | gpio_dir;
if (send_buf(ftdic, buf, 3)) {
ret = -8;
goto ftdi_err;
@@ -446,9 +467,11 @@ static int ft2232_spi_send_command(struct flashctx *flash,
* operations.
*/
msg_pspew("Assert CS#\n");
+ msg_pspew("Value: 0x%02x\n", ~cs_bits & gpio_value);
+ msg_pspew("Dir: 0x%02x\n", pindir | gpio_dir);
buf[i++] = SET_BITS_LOW;
- buf[i++] = 0 & ~cs_bits; /* assertive */
- buf[i++] = pindir;
+ buf[i++] = ~cs_bits & gpio_value; /* assertive */
+ buf[i++] = pindir | gpio_dir;
if (writecnt) {
buf[i++] = MPSSE_DO_WRITE | MPSSE_WRITE_NEG;
@@ -487,9 +510,11 @@ static int ft2232_spi_send_command(struct flashctx *flash,
}
msg_pspew("De-assert CS#\n");
+ msg_pspew("Value: 0x%02x\n", cs_bits | gpio_value);
+ msg_pspew("Dir: 0x%02x\n", pindir | gpio_dir);
buf[i++] = SET_BITS_LOW;
- buf[i++] = cs_bits;
- buf[i++] = pindir;
+ buf[i++] = cs_bits | gpio_value;
+ buf[i++] = pindir | gpio_dir;
ret = send_buf(ftdic, buf, i);
failed |= ret;
if (ret)
--
1.9.1*
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