Release 4.14 arch/powerpc/platforms/82xx/pq2ads-pci-pic.c

/*
 * PQ2 ADS-style PCI interrupt controller
 *
 * Copyright 2007 Freescale Semiconductor, Inc.
 * Author: Scott Wood <scottwood@freescale.com>
 *
 * Loosely based on mpc82xx ADS support by Vitaly Bordug <vbordug@ru.mvista.com>
 * Copyright (c) 2006 MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/irq.h>
#include <linux/types.h>
#include <linux/slab.h>

#include <asm/io.h>
#include <asm/prom.h>
#include <asm/cpm2.h>

#include "pq2.h"

static DEFINE_RAW_SPINLOCK(pci_pic_lock);


struct pq2ads_pci_pic {
	
struct device_node *node;
	
struct irq_domain *host;

	struct {
		
u32 stat;
		
u32 mask;
	
} __iomem *regs;
};


#define NUM_IRQS 32



static void pq2ads_pci_mask_irq(struct irq_data *d)
{
	struct pq2ads_pci_pic *priv = irq_data_get_irq_chip_data(d);
	int irq = NUM_IRQS - irqd_to_hwirq(d) - 1;

	if (irq != -1) {
		unsigned long flags;
		raw_spin_lock_irqsave(&pci_pic_lock, flags);

		setbits32(&priv->regs->mask, 1 << irq);
		mb();

		raw_spin_unlock_irqrestore(&pci_pic_lock, flags);
	}
}

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Scott Wood
69
87.34%
1
25.00%
Lennert Buytenhek
7
8.86%
1
25.00%
Anton Vorontsov
2
2.53%
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Grant C. Likely
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1.27%
1
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4
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static void pq2ads_pci_unmask_irq(struct irq_data *d)
{
	struct pq2ads_pci_pic *priv = irq_data_get_irq_chip_data(d);
	int irq = NUM_IRQS - irqd_to_hwirq(d) - 1;

	if (irq != -1) {
		unsigned long flags;

		raw_spin_lock_irqsave(&pci_pic_lock, flags);
		clrbits32(&priv->regs->mask, 1 << irq);
		raw_spin_unlock_irqrestore(&pci_pic_lock, flags);
	}
}

Contributors
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CommitProp
Scott Wood
66
86.84%
1
25.00%
Lennert Buytenhek
7
9.21%
1
25.00%
Anton Vorontsov
2
2.63%
1
25.00%
Grant C. Likely
1
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1
25.00%
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4
100.00%


static struct irq_chip pq2ads_pci_ic = {
	.name = "PQ2 ADS PCI",
	.irq_mask = pq2ads_pci_mask_irq,
	.irq_mask_ack = pq2ads_pci_mask_irq,
	.irq_ack = pq2ads_pci_mask_irq,
	.irq_unmask = pq2ads_pci_unmask_irq,
	.irq_enable = pq2ads_pci_unmask_irq,
	.irq_disable = pq2ads_pci_mask_irq
};



static void pq2ads_pci_irq_demux(struct irq_desc *desc)
{
	struct pq2ads_pci_pic *priv = irq_desc_get_handler_data(desc);
	u32 stat, mask, pend;
	int bit;

	for (;;) {
		stat = in_be32(&priv->regs->stat);
		mask = in_be32(&priv->regs->mask);

		pend = stat & ~mask;

		if (!pend)
			break;

		for (bit = 0; pend != 0; ++bit, pend <<= 1) {
			if (pend & 0x80000000) {
				int virq = irq_linear_revmap(priv->host, bit);
				generic_handle_irq(virq);
			}
		}
	}
}

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Scott Wood
116
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1.68%
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Thomas Gleixner
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static int pci_pic_host_map(struct irq_domain *h, unsigned int virq,
			    irq_hw_number_t hw)
{
	irq_set_status_flags(virq, IRQ_LEVEL);
	irq_set_chip_data(virq, h->host_data);
	irq_set_chip_and_handler(virq, &pq2ads_pci_ic, handle_level_irq);
	return 0;
}

Contributors
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Scott Wood
39
82.98%
1
20.00%
Thomas Gleixner
5
10.64%
2
40.00%
Rune Torgersen
2
4.26%
1
20.00%
Grant C. Likely
1
2.13%
1
20.00%
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static const struct irq_domain_ops pci_pic_host_ops = {
	.map = pci_pic_host_map,
};



int __init pq2ads_pci_init_irq(void)
{
	struct pq2ads_pci_pic *priv;
	struct irq_domain *host;
	struct device_node *np;
	int ret = -ENODEV;
	int irq;

	np = of_find_compatible_node(NULL, NULL, "fsl,pq2ads-pci-pic");
	if (!np) {
		printk(KERN_ERR "No pci pic node in device tree.\n");
		of_node_put(np);
		goto out;
	}

	irq = irq_of_parse_and_map(np, 0);
	if (!irq) {
		printk(KERN_ERR "No interrupt in pci pic node.\n");
		of_node_put(np);
		goto out;
	}

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		of_node_put(np);
		ret = -ENOMEM;
		goto out_unmap_irq;
	}

	/* PCI interrupt controller registers: status and mask */
	priv->regs = of_iomap(np, 0);
	if (!priv->regs) {
		printk(KERN_ERR "Cannot map PCI PIC registers.\n");
		goto out_free_kmalloc;
	}

	/* mask all PCI interrupts */
	out_be32(&priv->regs->mask, ~0);
	mb();

	host = irq_domain_add_linear(np, NUM_IRQS, &pci_pic_host_ops, priv);
	if (!host) {
		ret = -ENOMEM;
		goto out_unmap_regs;
	}

	priv->host = host;
	irq_set_handler_data(irq, priv);
	irq_set_chained_handler(irq, pq2ads_pci_irq_demux);

	of_node_put(np);
	return 0;

out_unmap_regs:
	iounmap(priv->regs);
out_free_kmalloc:
	kfree(priv);
	of_node_put(np);
out_unmap_irq:
	irq_dispose_mapping(irq);
out:
	return ret;
}
Contributors
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Scott Wood
250
94.70%
1
14.29%
Anton Vorontsov
5
1.89%
1
14.29%
Grant C. Likely
3
1.14%
2
28.57%
JoonSoo Kim
3
1.14%
1
14.29%
Thomas Gleixner
2
0.76%
1
14.29%
Michael Ellerman
1
0.38%
1
14.29%
Total
264
100.00%
7
100.00%

Overall Contributors
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Tokens
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CommitProp
Scott Wood
648
91.78%
1
7.14%
Lennert Buytenhek
22
3.12%
1
7.14%
Anton Vorontsov
10
1.42%
2
14.29%
Grant C. Likely
9
1.27%
4
28.57%
Thomas Gleixner
8
1.13%
2
14.29%
Tejun Heo
3
0.42%
1
7.14%
JoonSoo Kim
3
0.42%
1
7.14%
Rune Torgersen
2
0.28%
1
7.14%
Michael Ellerman
1
0.14%
1
7.14%
Total
706
100.00%
14
100.00%
Directory: arch/powerpc/platforms/82xx

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