static int pd6729_set_mem_map()

in pd6729.c [466:541]

• 54 lines of code
• 13 McCabe index (conditional complexity)

static int pd6729_set_mem_map(struct pcmcia_socket *sock,
			      struct pccard_mem_map *mem)
{
	struct pd6729_socket *socket
			 = container_of(sock, struct pd6729_socket, socket);
	unsigned short base, i;
	unsigned char map;

	map = mem->map;
	if (map > 4) {
		dev_warn(&sock->dev, "invalid map requested\n");
		return -EINVAL;
	}

	if ((mem->res->start > mem->res->end) || (mem->speed > 1000)) {
		dev_warn(&sock->dev, "invalid invalid address / speed\n");
		return -EINVAL;
	}

	/* Turn off the window before changing anything */
	if (indirect_read(socket, I365_ADDRWIN) & I365_ENA_MEM(map))
		indirect_resetbit(socket, I365_ADDRWIN, I365_ENA_MEM(map));

	/* write the start address */
	base = I365_MEM(map);
	i = (mem->res->start >> 12) & 0x0fff;
	if (mem->flags & MAP_16BIT)
		i |= I365_MEM_16BIT;
	if (mem->flags & MAP_0WS)
		i |= I365_MEM_0WS;
	indirect_write16(socket, base + I365_W_START, i);

	/* write the stop address */

	i = (mem->res->end >> 12) & 0x0fff;
	switch (to_cycles(mem->speed)) {
	case 0:
		break;
	case 1:
		i |= I365_MEM_WS0;
		break;
	case 2:
		i |= I365_MEM_WS1;
		break;
	default:
		i |= I365_MEM_WS1 | I365_MEM_WS0;
		break;
	}

	indirect_write16(socket, base + I365_W_STOP, i);

	/* Take care of high byte */
	indirect_write(socket, PD67_EXT_INDEX, PD67_MEM_PAGE(map));
	indirect_write(socket, PD67_EXT_DATA, mem->res->start >> 24);

	/* card start */

	i = ((mem->card_start - mem->res->start) >> 12) & 0x3fff;
	if (mem->flags & MAP_WRPROT)
		i |= I365_MEM_WRPROT;
	if (mem->flags & MAP_ATTRIB) {
		/* dev_dbg(&sock->dev, "requesting attribute memory for "
		   "socket %i\n", socket->number);*/
		i |= I365_MEM_REG;
	} else {
		/* dev_dbg(&sock->dev, "requesting normal memory for "
		   "socket %i\n", socket->number);*/
	}
	indirect_write16(socket, base + I365_W_OFF, i);

	/* Enable the window if necessary */
	if (mem->flags & MAP_ACTIVE)
		indirect_setbit(socket, I365_ADDRWIN, I365_ENA_MEM(map));

	return 0;
}