static void hfcpci_clear_fifo_tx()

in hardware/mISDN/hfcpci.c [352:387]

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

static void hfcpci_clear_fifo_tx(struct hfc_pci *hc, int fifo)
{
	u_char		fifo_state;
	struct bzfifo	*bzt;

	if (fifo) {
		bzt = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b2;
		fifo_state = hc->hw.fifo_en & HFCPCI_FIFOEN_B2TX;
	} else {
		bzt = &((union fifo_area *)(hc->hw.fifos))->b_chans.txbz_b1;
		fifo_state = hc->hw.fifo_en & HFCPCI_FIFOEN_B1TX;
	}
	if (fifo_state)
		hc->hw.fifo_en ^= fifo_state;
	Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
	if (hc->bch[fifo].debug & DEBUG_HW_BCHANNEL)
		printk(KERN_DEBUG "hfcpci_clear_fifo_tx%d f1(%x) f2(%x) "
		       "z1(%x) z2(%x) state(%x)\n",
		       fifo, bzt->f1, bzt->f2,
		       le16_to_cpu(bzt->za[MAX_B_FRAMES].z1),
		       le16_to_cpu(bzt->za[MAX_B_FRAMES].z2),
		       fifo_state);
	bzt->f2 = MAX_B_FRAMES;
	bzt->f1 = bzt->f2;	/* init F pointers to remain constant */
	bzt->za[MAX_B_FRAMES].z1 = cpu_to_le16(B_FIFO_SIZE + B_SUB_VAL - 1);
	bzt->za[MAX_B_FRAMES].z2 = cpu_to_le16(B_FIFO_SIZE + B_SUB_VAL - 2);
	if (fifo_state)
		hc->hw.fifo_en |= fifo_state;
	Write_hfc(hc, HFCPCI_FIFO_EN, hc->hw.fifo_en);
	if (hc->bch[fifo].debug & DEBUG_HW_BCHANNEL)
		printk(KERN_DEBUG
		       "hfcpci_clear_fifo_tx%d f1(%x) f2(%x) z1(%x) z2(%x)\n",
		       fifo, bzt->f1, bzt->f2,
		       le16_to_cpu(bzt->za[MAX_B_FRAMES].z1),
		       le16_to_cpu(bzt->za[MAX_B_FRAMES].z2));
}