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dummyflasher.c: Upstream ChromiumOS 'freq' param feature

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This allows the dummyflasher to emulate a bus/chip frequency
by passing a delay parameter.

BUG=b:140394053
BRANCH=none
TEST=builds and ran with freq passed,
```
   └──╼ dd if=/dev/urandom of=/tmp/bar bs=2K count=1
   1+0 records in
   1+0 records out
   2048 bytes (2.0 kB, 2.0 KiB) copied, 0.000583308 s, 3.5 MB/s

   └──╼ ./flashrom -p dummy:image=/tmp/foo,bus=spi,freq=100Hz,size=2048,emulate=VARIABLE_SIZE -w /tmp/bar
   flashrom v1.2-105-g702c58a-dirty on Linux 5.7.10-1rodete2-amd64 (x86_64)
   flashrom is free software, get the source code at https://flashrom.org

   Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
   Found Generic flash chip "Variable Size SPI chip" (2 kB, SPI) on dummy.
   Reading old flash chip contents... done.
   Erasing and writing flash chip... Erase/write done.
   Verifying flash... VERIFIED.
```

Change-Id: I1c2702b9e0cae860f5f03114e307707d4d3219af
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/45461
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>
This commit is contained in:
Edward O'Callaghan 2020-09-17 13:32:00 +10:00 committed by Edward O'Callaghan
parent 702c58a321
commit cb9f3cd0a7
1 changed files with 52 additions and 0 deletions
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52
dummyflasher.c
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@ -54,6 +54,9 @@ struct emu_data {
unsigned int emu_chip_size;
int emu_modified; /* is the image modified since reading it? */
uint8_t emu_status;
/* If "freq" parameter is passed in from command line, commands will delay
* for this period before returning. */
unsigned long int delay_us;
unsigned int emu_max_byteprogram_size;
unsigned int emu_max_aai_size;
unsigned int emu_jedec_se_size;
@ -175,6 +178,7 @@ int dummy_init(void)
return 1;
}
data->emu_chip = EMULATE_NONE;
data->delay_us = 0;
spi_master_dummyflasher.data = data;
msg_pspew("%s\n", __func__);
@ -289,6 +293,52 @@ int dummy_init(void)
}
free(tmp);
/* frequency to emulate in Hz (default), KHz, or MHz */
tmp = extract_programmer_param("freq");
if (tmp) {
unsigned long int freq;
char *units = tmp;
char *end = tmp + strlen(tmp);
errno = 0;
freq = strtoul(tmp, &units, 0);
if (errno) {
msg_perr("Invalid frequency \"%s\", %s\n",
tmp, strerror(errno));
free(tmp);
return 1;
}
if ((units > tmp) && (units < end)) {
int units_valid = 0;
if (units < end - 3) {
;
} else if (units == end - 2) {
if (!strcasecmp(units, "hz"))
units_valid = 1;
} else if (units == end - 3) {
if (!strcasecmp(units, "khz")) {
freq *= 1000;
units_valid = 1;
} else if (!strcasecmp(units, "mhz")) {
freq *= 1000000;
units_valid = 1;
}
}
if (!units_valid) {
msg_perr("Invalid units: %s\n", units);
free(tmp);
return 1;
}
}
/* Assume we only work with bytes and transfer at 1 bit/Hz */
data->delay_us = (1000000 * 8) / freq;
}
free(tmp);
#if EMULATE_CHIP
#if EMULATE_SPI_CHIP
tmp = extract_programmer_param("size");
@ -963,6 +1013,8 @@ static int dummy_spi_send_command(const struct flashctx *flash, unsigned int wri
for (i = 0; i < readcnt; i++)
msg_pspew(" 0x%02x", readarr[i]);
msg_pspew("\n");
programmer_delay((writecnt + readcnt) * emu_data->delay_us);
return 0;
}