static int elroy_cfg_write()

in lba_pci.c [430:466]

• 29 lines of code
• 10 McCabe index (conditional complexity)

static int elroy_cfg_write(struct pci_bus *bus, unsigned int devfn, int pos, int size, u32 data)
{
	struct lba_device *d = LBA_DEV(parisc_walk_tree(bus->bridge));
	u32 local_bus = (bus->parent == NULL) ? 0 : bus->busn_res.start;
	u32 tok = LBA_CFG_TOK(local_bus,devfn);

	if ((pos > 255) || (devfn > 255))
		return -EINVAL;

	if (!LBA_SKIP_PROBE(d)) {
		/* Original Workaround */
		lba_wr_cfg(d, tok, pos, (u32) data, size);
		DBG_CFG("%s(%x+%2x) = 0x%x (a)\n", __func__, tok, pos,data);
		return 0;
	}

	if (LBA_SKIP_PROBE(d) && (!lba_device_present(bus->busn_res.start, devfn, d))) {
		DBG_CFG("%s(%x+%2x) = 0x%x (b)\n", __func__, tok, pos,data);
		return 1; /* New Workaround */
	}

	DBG_CFG("%s(%x+%2x) = 0x%x (c)\n", __func__, tok, pos, data);

	/* Basic Algorithm */
	LBA_CFG_ADDR_SETUP(d, tok | pos);
	switch(size) {
	case 1: WRITE_REG8 (data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 3));
		   break;
	case 2: WRITE_REG16(data, d->hba.base_addr + LBA_PCI_CFG_DATA + (pos & 2));
		   break;
	case 4: WRITE_REG32(data, d->hba.base_addr + LBA_PCI_CFG_DATA);
		   break;
	}
	/* flush posted write */
	lba_t32 = READ_REG32(d->hba.base_addr + LBA_PCI_CFG_ADDR);
	return 0;
}