Adds the infrastructure parts that allow for sanity checks of
transactions without executing them. This includes new fields in
struct spi_programmer and default implementations as well as
concrete implementations for existing programmer where it makes sense.
Some additional cleanups are done as a bonus where i took the
opportunity, namely in sb600 and serprog.
Signed-off-by: Stefan Tauner <stefan.tauner(a)student.tuwien.ac.at>
---
bitbang_spi.c | 1 +
buspirate_spi.c | 14 +++++++++++++-
dediprog.c | 24 ++++++++++++++++--------
dummyflasher.c | 1 +
ft2232_spi.c | 14 +++++++++++++-
ichspi.c | 9 +++++++++
it85spi.c | 1 +
it87spi.c | 31 +++++++++++++++++++++++--------
linux_spi.c | 31 +++++++++++++++++++++++--------
programmer.h | 9 +++++++++
sb600spi.c | 51 ++++++++++++++++++++++++++++-----------------------
serprog.c | 32 +++++++++++++++++++++-----------
spi.c | 9 +++++++--
wbsio_spi.c | 10 ++++++++++
14 files changed, 175 insertions(+), 62 deletions(-)
diff --git a/bitbang_spi.c b/bitbang_spi.c
index 11d2de1..4b9f83a 100644
--- a/bitbang_spi.c
+++ b/bitbang_spi.c
@@ -67,6 +67,7 @@ static const struct spi_programmer spi_programmer_bitbang = {
.type = SPI_CONTROLLER_BITBANG,
.max_data_read = MAX_DATA_READ_UNLIMITED,
.max_data_write = MAX_DATA_WRITE_UNLIMITED,
+ .check_trans = default_spi_check_trans,
.command = bitbang_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = default_spi_read,
diff --git a/buspirate_spi.c b/buspirate_spi.c
index 054b4ff..340091c 100644
--- a/buspirate_spi.c
+++ b/buspirate_spi.c
@@ -129,6 +129,14 @@ static int buspirate_wait_for_string(unsigned char *buf, char *key)
return ret;
}
+static int buspirate_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ if (writecnt > 16 || readcnt > 16 || (readcnt + writecnt) > 16)
+ return SPI_INVALID_LENGTH;
+ return 0;
+}
+
static int buspirate_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr);
@@ -136,6 +144,7 @@ static const struct spi_programmer spi_programmer_buspirate = {
.type = SPI_CONTROLLER_BUSPIRATE,
.max_data_read = 12,
.max_data_write = 12,
+ .check_trans = buspirate_spi_check_trans,
.command = buspirate_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = default_spi_read,
@@ -421,8 +430,11 @@ static int buspirate_spi_send_command(struct flashctx *flash,
unsigned int i = 0;
int ret = 0;
- if (writecnt > 16 || readcnt > 16 || (readcnt + writecnt) > 16)
+ if (buspirate_spi_check_trans(flash, writecnt, readcnt, writearr) != 0) {
+ msg_pspew("%s called with an unsupported transaction layout: readcnt = %d, writecnt = %d.\n",
+ __func__, readcnt, writecnt);
return SPI_INVALID_LENGTH;
+ }
/* 3 bytes extra for CS#, len, CS#. */
if (buspirate_commbuf_grow(writecnt + readcnt + 3))
diff --git a/dediprog.c b/dediprog.c
index a81cf83..643b324 100644
--- a/dediprog.c
+++ b/dediprog.c
@@ -439,6 +439,18 @@ static int dediprog_spi_write_aai(struct flashctx *flash, uint8_t *buf, unsigned
return dediprog_spi_write(flash, buf, start, len, DEDI_SPI_CMD_AAIWRITE);
}
+static int dediprog_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ /* Paranoid, but I don't want to be blamed if anything explodes. */
+ if (writecnt > 16)
+ return 1;
+ /* 16 byte reads should work. */
+ if (readcnt > 16)
+ return -1;
+ return 0;
+}
+
static int dediprog_spi_send_command(struct flashctx *flash,
unsigned int writecnt,
unsigned int readcnt,
@@ -448,14 +460,9 @@ static int dediprog_spi_send_command(struct flashctx *flash,
int ret;
msg_pspew("%s, writecnt=%i, readcnt=%i\n", __func__, writecnt, readcnt);
- /* Paranoid, but I don't want to be blamed if anything explodes. */
- if (writecnt > 16) {
- msg_perr("Untested writecnt=%i, aborting.\n", writecnt);
- return 1;
- }
- /* 16 byte reads should work. */
- if (readcnt > 16) {
- msg_perr("Untested readcnt=%i, aborting.\n", readcnt);
+ if (dediprog_spi_check_trans(flash, writecnt, readcnt, writearr) != 0) {
+ msg_perr("%s called with an unsupported transaction layout: readcnt = %d, writecnt = %d.\n",
+ __func__, readcnt, writecnt);
return 1;
}
@@ -740,6 +747,7 @@ static const struct spi_programmer spi_programmer_dediprog = {
.type = SPI_CONTROLLER_DEDIPROG,
.max_data_read = MAX_DATA_UNSPECIFIED,
.max_data_write = MAX_DATA_UNSPECIFIED,
+ .check_trans = dediprog_spi_check_trans,
.command = dediprog_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = dediprog_spi_read,
diff --git a/dummyflasher.c b/dummyflasher.c
index 655b678..4e08386 100644
--- a/dummyflasher.c
+++ b/dummyflasher.c
@@ -123,6 +123,7 @@ static const struct spi_programmer spi_programmer_dummyflasher = {
.type = SPI_CONTROLLER_DUMMY,
.max_data_read = MAX_DATA_READ_UNLIMITED,
.max_data_write = MAX_DATA_UNSPECIFIED,
+ .check_trans = default_spi_check_trans, /* FIXME */
.command = dummy_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = default_spi_read,
diff --git a/ft2232_spi.c b/ft2232_spi.c
index 31a6c5c..d139886 100644
--- a/ft2232_spi.c
+++ b/ft2232_spi.c
@@ -139,6 +139,14 @@ static int get_buf(struct ftdi_context *ftdic, const unsigned char *buf,
return 0;
}
+static int ft2232_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ if (writecnt > 65536 || readcnt > 65536)
+ return SPI_INVALID_LENGTH;
+ return 0;
+}
+
static int ft2232_spi_send_command(struct flashctx *flash,
unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr,
@@ -148,6 +156,7 @@ static const struct spi_programmer spi_programmer_ft2232 = {
.type = SPI_CONTROLLER_FT2232,
.max_data_read = 64 * 1024,
.max_data_write = 256,
+ .check_trans = ft2232_spi_check_trans,
.command = ft2232_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = default_spi_read,
@@ -407,8 +416,11 @@ static int ft2232_spi_send_command(struct flashctx *flash,
int bufsize;
static int oldbufsize = 0;
- if (writecnt > 65536 || readcnt > 65536)
+ if (ft2232_spi_check_trans(flash, writecnt, readcnt, writearr) != 0) {
+ msg_pspew("%s called with an unsupported transaction layout: readcnt = %d, writecnt = %d.\n",
+ __func__, readcnt, writecnt);
return SPI_INVALID_LENGTH;
+ }
/* buf is not used for the response from the chip. */
bufsize = max(writecnt + 9, 260 + 9);
diff --git a/ichspi.c b/ichspi.c
index e60913c..0ce9dc2 100644
--- a/ichspi.c
+++ b/ichspi.c
@@ -1082,6 +1082,12 @@ static int prepare_opcode(struct flashctx *flash, unsigned int writecnt, unsigne
return 0;
}
+static int ich_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ return prepare_opcode(flash, writecnt, readcnt, writearr, true, NULL);
+}
+
static int ich_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *writearr,
@@ -1563,6 +1569,7 @@ static const struct spi_programmer spi_programmer_ich7 = {
.type = SPI_CONTROLLER_ICH7,
.max_data_read = 64,
.max_data_write = 64,
+ .check_trans = ich_spi_check_trans,
.command = ich_spi_send_command,
.multicommand = ich_spi_send_multicommand,
.read = default_spi_read,
@@ -1574,6 +1581,7 @@ static const struct spi_programmer spi_programmer_ich9 = {
.type = SPI_CONTROLLER_ICH9,
.max_data_read = 64,
.max_data_write = 64,
+ .check_trans = ich_spi_check_trans,
.command = ich_spi_send_command,
.multicommand = ich_spi_send_multicommand,
.read = default_spi_read,
@@ -1881,6 +1889,7 @@ static const struct spi_programmer spi_programmer_via = {
.type = SPI_CONTROLLER_VIA,
.max_data_read = 16,
.max_data_write = 16,
+ .check_trans = ich_spi_check_trans,
.command = ich_spi_send_command,
.multicommand = ich_spi_send_multicommand,
.read = default_spi_read,
diff --git a/it85spi.c b/it85spi.c
index 0b074eb..67c7185 100644
--- a/it85spi.c
+++ b/it85spi.c
@@ -280,6 +280,7 @@ static const struct spi_programmer spi_programmer_it85xx = {
.type = SPI_CONTROLLER_IT85XX,
.max_data_read = 64,
.max_data_write = 64,
+ .check_trans = default_spi_check_trans,
.command = it85xx_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = default_spi_read,
diff --git a/it87spi.c b/it87spi.c
index a35ddc0..f7b2a9e 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -104,6 +104,8 @@ void probe_superio_ite(void)
return;
}
+static int it8716f_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr);
static int it8716f_spi_send_command(struct flashctx *flash,
unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr,
@@ -117,6 +119,7 @@ static const struct spi_programmer spi_programmer_it87xx = {
.type = SPI_CONTROLLER_IT87XX,
.max_data_read = MAX_DATA_UNSPECIFIED,
.max_data_write = MAX_DATA_UNSPECIFIED,
+ .check_trans = it8716f_spi_check_trans,
.command = it8716f_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = it8716f_spi_chip_read,
@@ -242,6 +245,18 @@ int init_superio_ite(void)
return ret;
}
+static int it8716f_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ if (readcnt > 3) {
+ return -1;
+ }
+ if (writecnt != 1 && writecnt != 2 && writecnt != 4 && writecnt != 5) {
+ return 1;
+ }
+ return 0;
+}
+
/*
* The IT8716F only supports commands with length 1,2,4,5 bytes including
* command byte and can not read more than 3 bytes from the device.
@@ -259,14 +274,16 @@ static int it8716f_spi_send_command(struct flashctx *flash,
uint8_t busy, writeenc;
int i;
+ if (it8716f_spi_check_trans(flash, writecnt, readcnt, writearr) != 0) {
+ msg_pspew("%s called with an unsupported transaction layout: readcnt = %d, writecnt = %d.\n",
+ __func__, readcnt, writecnt);
+ return SPI_INVALID_LENGTH;
+ }
+
do {
busy = INB(it8716f_flashport) & 0x80;
} while (busy);
- if (readcnt > 3) {
- msg_pinfo("%s called with unsupported readcnt %i.\n",
- __func__, readcnt);
- return SPI_INVALID_LENGTH;
- }
+
switch (writecnt) {
case 1:
OUTB(writearr[0], it8716f_flashport + 1);
@@ -292,9 +309,7 @@ static int it8716f_spi_send_command(struct flashctx *flash,
OUTB(writearr[4], it8716f_flashport + 7);
writeenc = 0x3;
break;
- default:
- msg_pinfo("%s called with unsupported writecnt %i.\n",
- __func__, writecnt);
+ default: /* Should never happen due to the checks in it8716f_spi_check_trans() */
return SPI_INVALID_LENGTH;
}
/*
diff --git a/linux_spi.c b/linux_spi.c
index 2f46463..2301b84 100644
--- a/linux_spi.c
+++ b/linux_spi.c
@@ -37,6 +37,8 @@
static int fd = -1;
static int linux_spi_shutdown(void *data);
+static int linux_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr);
static int linux_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *txbuf,
@@ -50,6 +52,7 @@ static const struct spi_programmer spi_programmer_linux = {
.type = SPI_CONTROLLER_LINUX,
.max_data_read = MAX_DATA_UNSPECIFIED, /* TODO? */
.max_data_write = MAX_DATA_UNSPECIFIED, /* TODO? */
+ .check_trans = linux_spi_check_trans,
.command = linux_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = linux_spi_read,
@@ -129,29 +132,41 @@ static int linux_spi_shutdown(void *data)
return 0;
}
+static int linux_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ /* The implementation currently does not support requests that
+ don't start with sending a command. */
+ if (writecnt == 0)
+ return SPI_INVALID_LENGTH;
+ return 0;
+}
+
static int linux_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
- const unsigned char *txbuf,
- unsigned char *rxbuf)
+ const unsigned char *writearr,
+ unsigned char *readarr)
{
int iocontrol_code;
struct spi_ioc_transfer msg[2] = {
{
- .tx_buf = (uint64_t)(ptrdiff_t)txbuf,
+ .tx_buf = (uint64_t)(ptrdiff_t)writearr,
.len = writecnt,
},
{
- .rx_buf = (uint64_t)(ptrdiff_t)rxbuf,
+ .rx_buf = (uint64_t)(ptrdiff_t)readarr,
.len = readcnt,
},
};
+ int ret = linux_spi_check_trans(flash, writecnt, readcnt, writearr);
+ if (ret != 0)
+ msg_perr("%s called with an unsupported transaction layout: readcnt = %d, writecnt = %d.\n",
+ __func__, readcnt, writecnt);
+ return ret;
+
if (fd == -1)
return -1;
- /* The implementation currently does not support requests that
- don't start with sending a command. */
- if (writecnt == 0)
- return SPI_INVALID_LENGTH;
/* Just submit the first (write) request in case there is nothing
to read. Otherwise submit both requests. */
diff --git a/programmer.h b/programmer.h
index dedec67..bcd9547 100644
--- a/programmer.h
+++ b/programmer.h
@@ -529,9 +529,18 @@ struct spi_programmer {
int (*read)(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
int (*write_256)(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
int (*write_aai)(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len);
+ /* Returns 0 if the supplied data can be sent by this programmer. Possible error codes include:
+ * SPI_INVALID_LENGTH if readcnt, writecnt or their combination is not allowed
+ * negative values if readcnt is too big
+ * positive values if writecnt is too big */
+ int (*check_trans)(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr);
+ int (*check_transs)(struct flashctx *flash, struct spi_command *cmds);
const void *data;
};
+int default_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr);
int default_spi_send_command(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr, unsigned char *readarr);
int default_spi_send_multicommand(struct flashctx *flash, struct spi_command *cmds);
diff --git a/sb600spi.c b/sb600spi.c
index fe60aa9..9acf476 100644
--- a/sb600spi.c
+++ b/sb600spi.c
@@ -89,33 +89,37 @@ static void execute_command(void)
;
}
+static int sb600_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ /* We expect 1 opcode byte plus up to 8 data bytes (in any direction):
+ * the opcode has its own register, the data bytes are sent via an 8 byte FIFO. */
+ if ((writecnt == 0) || (writecnt - 1 + readcnt > 8)) {
+ return SPI_INVALID_LENGTH;
+ }
+ return 0;
+}
+
+
static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *writearr,
unsigned char *readarr)
{
int count;
- /* First byte is cmd which can not being sent through FIFO. */
- unsigned char cmd = *writearr++;
+ unsigned char cmd = *writearr;
unsigned int readoffby1;
unsigned char readwrite;
- writecnt--;
-
- msg_pspew("%s, cmd=%x, writecnt=%x, readcnt=%x\n",
- __func__, cmd, writecnt, readcnt);
-
- if (readcnt > 8) {
- msg_pinfo("%s, SB600 SPI controller can not receive %d bytes, "
- "it is limited to 8 bytes\n", __func__, readcnt);
+ if (sb600_spi_check_trans(flash, writecnt, readcnt, writearr) != 0) {
+ msg_perr("%s called with an unsupported transaction layout: readcnt = %d, writecnt = %d.\n",
+ __func__, readcnt, writecnt);
return SPI_INVALID_LENGTH;
}
- if (writecnt > 8) {
- msg_pinfo("%s, SB600 SPI controller can not send %d bytes, "
- "it is limited to 8 bytes\n", __func__, writecnt);
- return SPI_INVALID_LENGTH;
- }
+ /* First byte is cmd which can not be sent through FIFO. */
+ writecnt--;
+ writearr++;
/* This is a workaround for a bug in SB600 and SB700. If we only send
* an opcode and no additional data/address, the SPI controller will
@@ -123,7 +127,7 @@ static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
* the chip response is discarded and will not end up in the FIFO.
* It is unclear if the CS# line is set high too early as well.
*/
- readoffby1 = (writecnt) ? 0 : 1;
+ readoffby1 = (writecnt == 0) ? 1 : 0;
readwrite = (readcnt + readoffby1) << 4 | (writecnt);
mmio_writeb(readwrite, sb600_spibar + 1);
mmio_writeb(cmd, sb600_spibar + 0);
@@ -196,13 +200,14 @@ static int sb600_spi_send_command(struct flashctx *flash, unsigned int writecnt,
static const struct spi_programmer spi_programmer_sb600 = {
.type = SPI_CONTROLLER_SB600,
- .max_data_read = 8,
- .max_data_write = 5,
- .command = sb600_spi_send_command,
- .multicommand = default_spi_send_multicommand,
- .read = default_spi_read,
- .write_256 = default_spi_write_256,
- .write_aai = default_spi_write_aai,
+ .max_data_read = 8,
+ .max_data_write = 5,
+ .check_trans = sb600_spi_check_trans,
+ .command = sb600_spi_send_command,
+ .multicommand = default_spi_send_multicommand,
+ .read = default_spi_read,
+ .write_256 = default_spi_write_256,
+ .write_aai = default_spi_write_aai,
};
int sb600_probe_spi(struct pci_dev *dev)
diff --git a/serprog.c b/serprog.c
index b179ea4..4b0dc19 100644
--- a/serprog.c
+++ b/serprog.c
@@ -234,31 +234,31 @@ err_out:
return 1;
}
-static int sp_check_commandavail(uint8_t command)
+static int sp_check_commandavail(uint8_t cmd)
{
int byteoffs, bitoffs;
- byteoffs = command / 8;
- bitoffs = command % 8;
+ byteoffs = cmd / 8;
+ bitoffs = cmd % 8;
return (sp_cmdmap[byteoffs] & (1 << bitoffs)) ? 1 : 0;
}
static int sp_automatic_cmdcheck(uint8_t cmd)
{
- if ((sp_check_avail_automatic) && (sp_check_commandavail(cmd) == 0)) {
- msg_pdbg("Warning: Automatic command availability check failed "
- "for cmd 0x%x - won't execute cmd\n", cmd);
+ if ((sp_check_avail_automatic) && (sp_check_commandavail(cmd) == 0))
return 1;
- }
return 0;
}
-static int sp_docommand(uint8_t command, uint32_t parmlen,
+static int sp_docommand(uint8_t cmd, uint32_t parmlen,
uint8_t *params, uint32_t retlen, void *retparms)
{
unsigned char c;
- if (sp_automatic_cmdcheck(command))
+ if (sp_automatic_cmdcheck(cmd)) {
+ msg_pdbg("Warning: Automatic command availability check failed "
+ "for cmd 0x%x - won't execute cmd\n", cmd);
return 1;
- if (write(sp_fd, &command, 1) != 1) {
+ }
+ if (write(sp_fd, &cmd, 1) != 1) {
msg_perr("Error: cannot write op code: %s\n", strerror(errno));
return 1;
}
@@ -316,8 +316,11 @@ static void sp_flush_stream(void)
static int sp_stream_buffer_op(uint8_t cmd, uint32_t parmlen, uint8_t * parms)
{
uint8_t *sp;
- if (sp_automatic_cmdcheck(cmd))
+ if (sp_automatic_cmdcheck(cmd)) {
+ msg_pdbg("Warning: Automatic command availability check failed "
+ "for cmd 0x%x - won't execute cmd\n", cmd);
return 1;
+ }
sp = malloc(1 + parmlen);
if (!sp) sp_die("Error: cannot malloc command buffer");
sp[0] = cmd;
@@ -332,6 +335,12 @@ static int sp_stream_buffer_op(uint8_t cmd, uint32_t parmlen, uint8_t * parms)
return 0;
}
+static int serprog_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ return sp_automatic_cmdcheck(S_CMD_O_SPIOP);
+}
+
static int serprog_spi_send_command(struct flashctx *flash,
unsigned int writecnt, unsigned int readcnt,
const unsigned char *writearr,
@@ -342,6 +351,7 @@ static struct spi_programmer spi_programmer_serprog = {
.type = SPI_CONTROLLER_SERPROG,
.max_data_read = MAX_DATA_READ_UNLIMITED,
.max_data_write = MAX_DATA_WRITE_UNLIMITED,
+ .check_trans = serprog_spi_check_trans,
.command = serprog_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = serprog_spi_read,
diff --git a/spi.c b/spi.c
index 94a76a7..046d095 100644
--- a/spi.c
+++ b/spi.c
@@ -30,12 +30,17 @@
#include "programmer.h"
#include "spi.h"
+int default_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ return 0;
+}
+
int spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt, const unsigned char *writearr,
unsigned char *readarr)
{
- return flash->pgm->spi.command(flash, writecnt, readcnt, writearr,
- readarr);
+ return flash->pgm->spi.command(flash, writecnt, readcnt, writearr, readarr);
}
int spi_send_multicommand(struct flashctx *flash, struct spi_command *cmds)
diff --git a/wbsio_spi.c b/wbsio_spi.c
index 778b983..ec14c28 100644
--- a/wbsio_spi.c
+++ b/wbsio_spi.c
@@ -108,6 +108,15 @@ static uint8_t determine_mode(struct flashctx *flash, unsigned int writecnt, uns
return 0;
}
+static int wbsio_spi_check_trans(struct flashctx *flash, unsigned int writecnt, unsigned int readcnt,
+ const unsigned char *writearr)
+{
+ if (determine_mode(flash, writecnt, readcnt, writearr) == 0)
+ return SPI_INVALID_LENGTH;
+
+ return 0;
+}
+
static int wbsio_spi_send_command(struct flashctx *flash, unsigned int writecnt,
unsigned int readcnt,
const unsigned char *writearr,
@@ -119,6 +128,7 @@ static const struct spi_programmer spi_programmer_wbsio = {
.type = SPI_CONTROLLER_WBSIO,
.max_data_read = MAX_DATA_UNSPECIFIED,
.max_data_write = MAX_DATA_UNSPECIFIED,
+ .check_trans = wbsio_spi_check_trans,
.command = wbsio_spi_send_command,
.multicommand = default_spi_send_multicommand,
.read = wbsio_spi_read,
--
Kind regards, Stefan Tauner
