static int altera_ps_write_init()

in altera-ps-spi.c [106:151]

• 34 lines of code
• 6 McCabe index (conditional complexity)

static int altera_ps_write_init(struct fpga_manager *mgr,
				struct fpga_image_info *info,
				const char *buf, size_t count)
{
	struct altera_ps_conf *conf = mgr->priv;
	int min, max, waits;
	int i;

	conf->info_flags = info->flags;

	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
		dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
		return -EINVAL;
	}

	gpiod_set_value_cansleep(conf->config, 1);

	/* wait min reset pulse time */
	altera_ps_delay(conf->data->t_cfg_us);

	if (!gpiod_get_value_cansleep(conf->status)) {
		dev_err(&mgr->dev, "Status pin failed to show a reset\n");
		return -EIO;
	}

	gpiod_set_value_cansleep(conf->config, 0);

	min = conf->data->status_wait_min_us;
	max = conf->data->status_wait_max_us;
	waits = max / min;
	if (max % min)
		waits++;

	/* wait for max { max(t_STATUS), max(t_CF2ST1) } */
	for (i = 0; i < waits; i++) {
		usleep_range(min, min + 10);
		if (!gpiod_get_value_cansleep(conf->status)) {
			/* wait for min(t_ST2CK)*/
			altera_ps_delay(conf->data->t_st2ck_us);
			return 0;
		}
	}

	dev_err(&mgr->dev, "Status pin not ready.\n");
	return -EIO;
}