1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  Support for the interrupt controllers found on Power Macintosh,
4  *  currently Apple's "Grand Central" interrupt controller in all
18 #include <linux/interrupt.h>
30 #include <asm/pci-bridge.h>
61 static int pmac_irq_cascade = -1;
79 	unsigned int src = irqd_to_hwirq(d);  in pmac_mask_and_ack_irq()  local
80         unsigned long bit = 1UL << (src & 0x1f);  in pmac_mask_and_ack_irq()
81         int i = src >> 5;  in pmac_mask_and_ack_irq()
85         __clear_bit(src, ppc_cached_irq_mask);  in pmac_mask_and_ack_irq()
86         if (__test_and_clear_bit(src, ppc_lost_interrupts))  in pmac_mask_and_ack_irq()
88         out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);  in pmac_mask_and_ack_irq()
89         out_le32(&pmac_irq_hw[i]->ack, bit);  in pmac_mask_and_ack_irq()
94         } while((in_le32(&pmac_irq_hw[i]->enable) & bit)  in pmac_mask_and_ack_irq()
101 	unsigned int src = irqd_to_hwirq(d);  in pmac_ack_irq()  local
102         unsigned long bit = 1UL << (src & 0x1f);  in pmac_ack_irq()
103         int i = src >> 5;  in pmac_ack_irq()
107 	if (__test_and_clear_bit(src, ppc_lost_interrupts))  in pmac_ack_irq()
109         out_le32(&pmac_irq_hw[i]->ack, bit);  in pmac_ack_irq()
110         (void)in_le32(&pmac_irq_hw[i]->ack);  in pmac_ack_irq()
123         out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]);  in __pmac_set_irq_mask()
129         } while((in_le32(&pmac_irq_hw[i]->enable) & bit)  in __pmac_set_irq_mask()
134          * when the device interrupt is already on *doesn't* set  in __pmac_set_irq_mask()
135          * the bit in the flag register or request another interrupt.  in __pmac_set_irq_mask()
137         if (bit & ppc_cached_irq_mask[i] & in_le32(&pmac_irq_hw[i]->level))  in __pmac_set_irq_mask()
142  * edge interrupt, we clear any previous one on the controller
147 	unsigned int src = irqd_to_hwirq(d);  in pmac_startup_irq()  local
148         unsigned long bit = 1UL << (src & 0x1f);  in pmac_startup_irq()
149         int i = src >> 5;  in pmac_startup_irq()
153 		out_le32(&pmac_irq_hw[i]->ack, bit);  in pmac_startup_irq()
154         __set_bit(src, ppc_cached_irq_mask);  in pmac_startup_irq()
155         __pmac_set_irq_mask(src, 0);  in pmac_startup_irq()
164 	unsigned int src = irqd_to_hwirq(d);  in pmac_mask_irq()  local
167         __clear_bit(src, ppc_cached_irq_mask);  in pmac_mask_irq()
168         __pmac_set_irq_mask(src, 1);  in pmac_mask_irq()
175 	unsigned int src = irqd_to_hwirq(d);  in pmac_unmask_irq()  local
178 	__set_bit(src, ppc_cached_irq_mask);  in pmac_unmask_irq()
179         __pmac_set_irq_mask(src, 0);  in pmac_unmask_irq()
194 	.name		= "PMAC-PIC",
210 	for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) {  in gatwick_action()
212 		bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];  in gatwick_action()
213 		bits |= in_le32(&pmac_irq_hw[i]->level);  in gatwick_action()
234 	/* IPI's are a hack on the powersurge -- Cort */  in pmac_pic_get_irq()
240 	for (irq = max_real_irqs; (irq -= 32) >= 0; ) {  in pmac_pic_get_irq()
242 		bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i];  in pmac_pic_get_irq()
243 		bits |= in_le32(&pmac_irq_hw[i]->level);  in pmac_pic_get_irq()
267 		return -EINVAL;  in pmac_pic_host_map()
295 	 * Find the interrupt controller type & node  in pmac_pic_probe_oldstyle()
306 	} else if ((master = of_find_node_by_name(NULL, "mac-io")) != NULL) {  in pmac_pic_probe_oldstyle()
313 		slave = of_find_node_by_name(master, "mac-io");  in pmac_pic_probe_oldstyle()
364 		       max_irqs - max_real_irqs, pmac_irq_cascade);  in pmac_pic_probe_oldstyle()
370 		out_le32(&pmac_irq_hw[i]->enable, 0);  in pmac_pic_probe_oldstyle()
376 			pr_err("Failed to register cascade interrupt\n");  in pmac_pic_probe_oldstyle()
382 	if (request_irq(i, xmon_irq, IRQF_NO_THREAD, "NMI - XMON", NULL))  in pmac_pic_probe_oldstyle()
383 		pr_err("Failed to register NMI-XMON interrupt\n");  in pmac_pic_probe_oldstyle()
394 	 * Old machines just have a list of interrupt numbers  in of_irq_parse_oldworld()
395 	 * and no interrupt-controller nodes. We also have dodgy  in of_irq_parse_oldworld()
397 	 * missing behind pci-pci bridges and we have to get it  in of_irq_parse_oldworld()
405 		device = device->parent;  in of_irq_parse_oldworld()
410 		return -EINVAL;  in of_irq_parse_oldworld()
414 		return -EINVAL;  in of_irq_parse_oldworld()
416 	out_irq->np = NULL;  in of_irq_parse_oldworld()
417 	out_irq->args[0] = ints[index];  in of_irq_parse_oldworld()
418 	out_irq->args_count = 1;  in of_irq_parse_oldworld()
430 	pswitch = of_find_node_by_name(NULL, "programmer-switch");  in pmac_pic_setup_mpic_nmi()
436 					"NMI - XMON", NULL))  in pmac_pic_setup_mpic_nmi()
437 				pr_err("Failed to register NMI-XMON interrupt\n");  in pmac_pic_setup_mpic_nmi()
453 	if (of_property_read_bool(np, "big-endian"))  in pmac_setup_one_mpic()
477 	for_each_node_by_type(np, "open-pic") {  in pmac_pic_probe_mpic()
496 		return -ENODEV;  in pmac_pic_probe_mpic()
534 	 * default interrupt controller (happens when booting with BootX).  in pmac_pic_init()
541 		for_each_node_with_property(np, "interrupt-controller") {  in pmac_pic_init()
542 			/* Skip /chosen/interrupt-controller */  in pmac_pic_init()
548 			 * interrupt controller too. */  in pmac_pic_init()
558 	/* We first try to detect Apple's new Core99 chipset, since mac-io  in pmac_pic_init()
572  * sleep_save_intrs() saves the states of all interrupt enables
574  * sleep_restore_intrs() restores the states of all interrupt enables.
584 	int viaint = -1;  in pmacpic_find_viaint()
591 	np = of_find_node_by_name(NULL, "via-pmu");  in pmacpic_find_viaint()
612 	out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]);  in pmacpic_suspend()
614 		out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]);  in pmacpic_suspend()
615 	(void)in_le32(&pmac_irq_hw[0]->event);  in pmacpic_suspend()
618         (void)in_le32(&pmac_irq_hw[0]->enable);  in pmacpic_suspend()
627 	out_le32(&pmac_irq_hw[0]->enable, 0);  in pmacpic_resume()
629 		out_le32(&pmac_irq_hw[1]->enable, 0);  in pmacpic_resume()