1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * External Interrupt Controller on Spider South Bridge
10 #include <linux/interrupt.h>
19 #include "interrupt.h"
21 /* register layout taken from Spider spec, table 7.4-4 */
65 					   unsigned int src)  in spider_get_irq_config()  argument
67 	return pic->regs + TIR_CFGA + 8 * src;  in spider_get_irq_config()
89 	unsigned int src = irqd_to_hwirq(d);  in spider_ack_irq()  local
97 	if (src < 47 || src > 50)  in spider_ack_irq()
101 	out_be32(pic->regs + TIR_EDC, 0x100 | (src & 0xf));  in spider_ack_irq()
116 		return -EINVAL;  in spider_set_irq_type()
134 		return -EINVAL;  in spider_set_irq_type()
139 	 * be the same as the interrupt source number. I don't know whether  in spider_set_irq_type()
145 		 (pic->node_id << 4) | 0xe);  in spider_set_irq_type()
162 	irq_set_chip_data(virq, h->host_data);  in spider_host_map()
176 	/* Spider interrupts have 2 cells, first is the interrupt source,  in spider_host_xlate()
178 	 * because old device-trees encode a node number in there  in spider_host_xlate()
196 	cs = in_be32(pic->regs + TIR_CS) >> 24;  in spider_irq_cascade()
198 		generic_handle_domain_irq(pic->host, cs);  in spider_irq_cascade()
200 	chip->irq_eoi(&desc->irq_data);  in spider_irq_cascade()
203 /* For hooking up the cascade we have a problem. Our device-tree is
204  * crap and we don't know on which BE iic interrupt we are hooked on at
209  * interrupt-map property which is pretty strange.
219 	of_node = irq_domain_get_of_node(pic->host);  in spider_find_cascade_and_node()
222 	 * tree in case the device-tree is ever fixed  in spider_find_cascade_and_node()
229 	tmp = of_get_property(of_node, "#interrupt-cells", NULL);  in spider_find_cascade_and_node()
233 	imap = of_get_property(of_node, "interrupt-map", &imaplen);  in spider_find_cascade_and_node()
240 	tmp = of_get_property(iic, "#interrupt-cells", NULL);  in spider_find_cascade_and_node()
246 	/* Assume unit is last entry of interrupt specifier */  in spider_find_cascade_and_node()
247 	unit = imap[intsize - 1];  in spider_find_cascade_and_node()
249 	tmp = of_get_property(iic, "ibm,interrupt-server-ranges", NULL);  in spider_find_cascade_and_node()
255 	pic->node_id = (*tmp) >> 1;  in spider_find_cascade_and_node()
262 	/* Manufacture an IIC interrupt number of class 2 */  in spider_find_cascade_and_node()
264 				  (pic->node_id << IIC_IRQ_NODE_SHIFT) |  in spider_find_cascade_and_node()
280 	pic->regs = ioremap(addr, 0x1000);  in spider_init_one()
281 	if (pic->regs == NULL)  in spider_init_one()
285 	pic->host = irq_domain_add_linear(of_node, SPIDER_SRC_COUNT,  in spider_init_one()
287 	if (pic->host == NULL)  in spider_init_one()
292 		void __iomem *cfg = pic->regs + TIR_CFGA + 8 * i;  in spider_init_one()
297 	out_be32(pic->regs + TIR_MSK, 0x0);  in spider_init_one()
299 	/* enable interrupt packets to be output */  in spider_init_one()
300 	out_be32(pic->regs + TIR_PIEN, in_be32(pic->regs + TIR_PIEN) | 0x1);  in spider_init_one()
302 	/* Hook up the cascade interrupt to the iic and nodeid */  in spider_init_one()
310 	       pic->node_id, addr, of_node);  in spider_init_one()
312 	/* Enable the interrupt detection enable bit. Do this last! */  in spider_init_one()
313 	out_be32(pic->regs + TIR_DEN, in_be32(pic->regs + TIR_DEN) | 0x1);  in spider_init_one()
326 	 * device-tree is bogus anyway) so all we can do is pray or maybe test  in spider_init_IRQ()
327 	 * the address and deduce the node-id  in spider_init_IRQ()
329 	for_each_node_by_name(dn, "interrupt-controller") {  in spider_init_IRQ()
330 		if (of_device_is_compatible(dn, "CBEA,platform-spider-pic")) {  in spider_init_IRQ()
332 				printk(KERN_WARNING "spider-pic: Failed\n");  in spider_init_IRQ()
335 		} else if (of_device_is_compatible(dn, "sti,platform-spider-pic")  in spider_init_IRQ()