2 * Copyright 2007, Olof Johansson, PA Semi
4 * Based on arch/powerpc/sysdev/mpic_u3msi.c:
6 * Copyright 2006, Segher Boessenkool, IBM Corporation.
7 * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; version 2 of the
16 #include <linux/irq.h>
17 #include <linux/msi.h>
20 #include <asm/hw_irq.h>
21 #include <asm/ppc-pci.h>
22 #include <asm/msi_bitmap.h>
24 #include <sysdev/mpic.h>
26 /* Allocate 16 interrupts per device, to give an alignment of 16,
27 * since that's the size of the grouping w.r.t. affinity. If someone
28 * needs more than 32 MSI's down the road we'll have to rethink this,
29 * but it should be OK for now.
31 #define ALLOC_CHUNK 16
33 #define PASEMI_MSI_ADDR 0xfc080000
35 /* A bit ugly, can we get this from the pci_dev somehow? */
36 static struct mpic
*msi_mpic
;
39 static void mpic_pasemi_msi_mask_irq(struct irq_data
*data
)
41 pr_debug("mpic_pasemi_msi_mask_irq %d\n", data
->irq
);
42 pci_msi_mask_irq(data
);
46 static void mpic_pasemi_msi_unmask_irq(struct irq_data
*data
)
48 pr_debug("mpic_pasemi_msi_unmask_irq %d\n", data
->irq
);
49 mpic_unmask_irq(data
);
50 pci_msi_unmask_irq(data
);
53 static struct irq_chip mpic_pasemi_msi_chip
= {
54 .irq_shutdown
= mpic_pasemi_msi_mask_irq
,
55 .irq_mask
= mpic_pasemi_msi_mask_irq
,
56 .irq_unmask
= mpic_pasemi_msi_unmask_irq
,
57 .irq_eoi
= mpic_end_irq
,
58 .irq_set_type
= mpic_set_irq_type
,
59 .irq_set_affinity
= mpic_set_affinity
,
63 static void pasemi_msi_teardown_msi_irqs(struct pci_dev
*pdev
)
65 struct msi_desc
*entry
;
67 pr_debug("pasemi_msi_teardown_msi_irqs, pdev %p\n", pdev
);
69 for_each_pci_msi_entry(entry
, pdev
) {
70 if (entry
->irq
== NO_IRQ
)
73 irq_set_msi_desc(entry
->irq
, NULL
);
74 msi_bitmap_free_hwirqs(&msi_mpic
->msi_bitmap
,
75 virq_to_hw(entry
->irq
), ALLOC_CHUNK
);
76 irq_dispose_mapping(entry
->irq
);
82 static int pasemi_msi_setup_msi_irqs(struct pci_dev
*pdev
, int nvec
, int type
)
85 struct msi_desc
*entry
;
89 if (type
== PCI_CAP_ID_MSIX
)
90 pr_debug("pasemi_msi: MSI-X untested, trying anyway\n");
91 pr_debug("pasemi_msi_setup_msi_irqs, pdev %p nvec %d type %d\n",
95 msg
.address_lo
= PASEMI_MSI_ADDR
;
97 for_each_pci_msi_entry(entry
, pdev
) {
98 /* Allocate 16 interrupts for now, since that's the grouping for
99 * affinity. This can be changed later if it turns out 32 is too
100 * few MSIs for someone, but restrictions will apply to how the
101 * sources can be changed independently.
103 hwirq
= msi_bitmap_alloc_hwirqs(&msi_mpic
->msi_bitmap
,
106 pr_debug("pasemi_msi: failed allocating hwirq\n");
110 virq
= irq_create_mapping(msi_mpic
->irqhost
, hwirq
);
111 if (virq
== NO_IRQ
) {
112 pr_debug("pasemi_msi: failed mapping hwirq 0x%x\n",
114 msi_bitmap_free_hwirqs(&msi_mpic
->msi_bitmap
, hwirq
,
119 /* Vector on MSI is really an offset, the hardware adds
120 * it to the value written at the magic address. So set
121 * it to 0 to remain sane.
123 mpic_set_vector(virq
, 0);
125 irq_set_msi_desc(virq
, entry
);
126 irq_set_chip(virq
, &mpic_pasemi_msi_chip
);
127 irq_set_irq_type(virq
, IRQ_TYPE_EDGE_RISING
);
129 pr_debug("pasemi_msi: allocated virq 0x%x (hw 0x%x) " \
130 "addr 0x%x\n", virq
, hwirq
, msg
.address_lo
);
132 /* Likewise, the device writes [0...511] into the target
133 * register to generate MSI [512...1023]
135 msg
.data
= hwirq
-0x200;
136 pci_write_msi_msg(virq
, &msg
);
142 int mpic_pasemi_msi_init(struct mpic
*mpic
)
145 struct pci_controller
*phb
;
147 if (!mpic
->irqhost
->of_node
||
148 !of_device_is_compatible(mpic
->irqhost
->of_node
,
149 "pasemi,pwrficient-openpic"))
152 rc
= mpic_msi_init_allocator(mpic
);
154 pr_debug("pasemi_msi: Error allocating bitmap!\n");
158 pr_debug("pasemi_msi: Registering PA Semi MPIC MSI callbacks\n");
161 list_for_each_entry(phb
, &hose_list
, list_node
) {
162 WARN_ON(phb
->controller_ops
.setup_msi_irqs
);
163 phb
->controller_ops
.setup_msi_irqs
= pasemi_msi_setup_msi_irqs
;
164 phb
->controller_ops
.teardown_msi_irqs
= pasemi_msi_teardown_msi_irqs
;