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ft2232_spi.c: use constants from ftdi.h instead of magic numbers

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Also, improve documentation of static variables cs_bits and pindir.

Corresponding to flashrom svn r1872.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
This commit is contained in:
Antony Pavlov 2015-01-25 03:52:47 +00:00 committed by Stefan Tauner
parent 57f276f208
commit b4dd40c5da
1 changed files with 20 additions and 10 deletions
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30
ft2232_spi.c
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@ -80,13 +80,16 @@ const struct dev_entry devs_ft2232spi[] = {
#define BITMODE_BITBANG_NORMAL 1
#define BITMODE_BITBANG_SPI 2
/* Set data bits low-byte command:
/* The variables cs_bits and pindir store the values for the "set data bits low byte" MPSSE command that
* sets the initial state and the direction of the I/O pins. The pin offsets are as follows:
* SCK is bit 0.
* DO is bit 1.
* DI is bit 2.
* CS is bit 3.
*
* The default values (set below) are used for most devices:
* value: 0x08 CS=high, DI=low, DO=low, SK=low
* dir: 0x0b CS=output, DI=input, DO=output, SK=output
*
* 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
*/
static uint8_t cs_bits = 0x08;
static uint8_t pindir = 0x0b;
@ -200,6 +203,9 @@ int ft2232_spi_init(void)
} else if (!strcasecmp(arg, "jtagkey")) {
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;
} else if (!strcasecmp(arg, "picotap")) {
@ -228,6 +234,9 @@ int ft2232_spi_init(void)
ft2232_vid = OLIMEX_VID;
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;
} else if (!strcasecmp(arg, "arm-usb-tiny")) {
@ -238,6 +247,7 @@ int ft2232_spi_init(void)
ft2232_vid = OLIMEX_VID;
ft2232_type = OLIMEX_ARM_OCD_H_PID;
channel_count = 2;
/* See arm-usb-ocd */
cs_bits = 0x08;
pindir = 0x1b;
} else if (!strcasecmp(arg, "arm-usb-tiny-h")) {
@ -350,7 +360,7 @@ int ft2232_spi_init(void)
if (clock_5x) {
msg_pdbg("Disable divide-by-5 front stage\n");
buf[0] = 0x8a; /* Disable divide-by-5. */
buf[0] = DIS_DIV_5;
if (send_buf(ftdic, buf, 1)) {
ret = -5;
goto ftdi_err;
@ -361,7 +371,7 @@ int ft2232_spi_init(void)
}
msg_pdbg("Set clock divisor\n");
buf[0] = 0x86; /* command "set divisor" */
buf[0] = TCK_DIVISOR;
buf[1] = (divisor / 2 - 1) & 0xff;
buf[2] = ((divisor / 2 - 1) >> 8) & 0xff;
if (send_buf(ftdic, buf, 3)) {
@ -374,7 +384,7 @@ int ft2232_spi_init(void)
/* Disconnect TDI/DO to TDO/DI for loopback. */
msg_pdbg("No loopback of TDI/DO TDO/DI\n");
buf[0] = 0x85;
buf[0] = LOOPBACK_END;
if (send_buf(ftdic, buf, 1)) {
ret = -7;
goto ftdi_err;
@ -441,7 +451,7 @@ static int ft2232_spi_send_command(struct flashctx *flash,
buf[i++] = pindir;
if (writecnt) {
buf[i++] = 0x11;
buf[i++] = MPSSE_DO_WRITE | MPSSE_WRITE_NEG;
buf[i++] = (writecnt - 1) & 0xff;
buf[i++] = ((writecnt - 1) >> 8) & 0xff;
memcpy(buf + i, writearr, writecnt);
@ -453,7 +463,7 @@ static int ft2232_spi_send_command(struct flashctx *flash,
* read command, then do the fetch of the results.
*/
if (readcnt) {
buf[i++] = 0x20;
buf[i++] = MPSSE_DO_READ;
buf[i++] = (readcnt - 1) & 0xff;
buf[i++] = ((readcnt - 1) >> 8) & 0xff;
ret = send_buf(ftdic, buf, i);