81e428943d7374d01e0aef8530e39c7ecd892b30
[linux-2.6.git] / arch / ia64 / sn / kernel / msi_sn.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 2006 Silicon Graphics, Inc.  All Rights Reserved.
7  */
8
9 #include <linux/types.h>
10 #include <linux/irq.h>
11 #include <linux/pci.h>
12 #include <linux/cpumask.h>
13 #include <linux/msi.h>
14
15 #include <asm/sn/addrs.h>
16 #include <asm/sn/intr.h>
17 #include <asm/sn/pcibus_provider_defs.h>
18 #include <asm/sn/pcidev.h>
19 #include <asm/sn/nodepda.h>
20
21 struct sn_msi_info {
22         u64 pci_addr;
23         struct sn_irq_info *sn_irq_info;
24 };
25
26 static struct sn_msi_info sn_msi_info[NR_IRQS];
27
28 static struct irq_chip sn_msi_chip;
29
30 void sn_teardown_msi_irq(unsigned int irq)
31 {
32         nasid_t nasid;
33         int widget;
34         struct pci_dev *pdev;
35         struct pcidev_info *sn_pdev;
36         struct sn_irq_info *sn_irq_info;
37         struct pcibus_bussoft *bussoft;
38         struct sn_pcibus_provider *provider;
39
40         sn_irq_info = sn_msi_info[irq].sn_irq_info;
41         if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
42                 return;
43
44         sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
45         pdev = sn_pdev->pdi_linux_pcidev;
46         provider = SN_PCIDEV_BUSPROVIDER(pdev);
47
48         (*provider->dma_unmap)(pdev,
49                                sn_msi_info[irq].pci_addr,
50                                PCI_DMA_FROMDEVICE);
51         sn_msi_info[irq].pci_addr = 0;
52
53         bussoft = SN_PCIDEV_BUSSOFT(pdev);
54         nasid = NASID_GET(bussoft->bs_base);
55         widget = (nasid & 1) ?
56                         TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
57                         SWIN_WIDGETNUM(bussoft->bs_base);
58
59         sn_intr_free(nasid, widget, sn_irq_info);
60         sn_msi_info[irq].sn_irq_info = NULL;
61
62         destroy_irq(irq);
63 }
64
65 int sn_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *entry)
66 {
67         struct msi_msg msg;
68         int widget;
69         int status;
70         nasid_t nasid;
71         u64 bus_addr;
72         struct sn_irq_info *sn_irq_info;
73         struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
74         struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
75         int irq;
76
77         if (!entry->msi_attrib.is_64)
78                 return -EINVAL;
79
80         if (bussoft == NULL)
81                 return -EINVAL;
82
83         if (provider == NULL || provider->dma_map_consistent == NULL)
84                 return -EINVAL;
85
86         irq = create_irq();
87         if (irq < 0)
88                 return irq;
89
90         /*
91          * Set up the vector plumbing.  Let the prom (via sn_intr_alloc)
92          * decide which cpu to direct this msi at by default.
93          */
94
95         nasid = NASID_GET(bussoft->bs_base);
96         widget = (nasid & 1) ?
97                         TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
98                         SWIN_WIDGETNUM(bussoft->bs_base);
99
100         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
101         if (! sn_irq_info) {
102                 destroy_irq(irq);
103                 return -ENOMEM;
104         }
105
106         status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
107         if (status) {
108                 kfree(sn_irq_info);
109                 destroy_irq(irq);
110                 return -ENOMEM;
111         }
112
113         sn_irq_info->irq_int_bit = -1;          /* mark this as an MSI irq */
114         sn_irq_fixup(pdev, sn_irq_info);
115
116         /* Prom probably should fill these in, but doesn't ... */
117         sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
118         sn_irq_info->irq_bridge = (void *)bussoft->bs_base;
119
120         /*
121          * Map the xio address into bus space
122          */
123         bus_addr = (*provider->dma_map_consistent)(pdev,
124                                         sn_irq_info->irq_xtalkaddr,
125                                         sizeof(sn_irq_info->irq_xtalkaddr),
126                                         SN_DMA_MSI|SN_DMA_ADDR_XIO);
127         if (! bus_addr) {
128                 sn_intr_free(nasid, widget, sn_irq_info);
129                 kfree(sn_irq_info);
130                 destroy_irq(irq);
131                 return -ENOMEM;
132         }
133
134         sn_msi_info[irq].sn_irq_info = sn_irq_info;
135         sn_msi_info[irq].pci_addr = bus_addr;
136
137         msg.address_hi = (u32)(bus_addr >> 32);
138         msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
139
140         /*
141          * In the SN platform, bit 16 is a "send vector" bit which
142          * must be present in order to move the vector through the system.
143          */
144         msg.data = 0x100 + irq;
145
146         set_irq_msi(irq, entry);
147         write_msi_msg(irq, &msg);
148         set_irq_chip_and_handler(irq, &sn_msi_chip, handle_edge_irq);
149
150         return 0;
151 }
152
153 #ifdef CONFIG_SMP
154 static void sn_set_msi_irq_affinity(unsigned int irq,
155                                     const struct cpumask *cpu_mask)
156 {
157         struct msi_msg msg;
158         int slice;
159         nasid_t nasid;
160         u64 bus_addr;
161         struct pci_dev *pdev;
162         struct pcidev_info *sn_pdev;
163         struct sn_irq_info *sn_irq_info;
164         struct sn_irq_info *new_irq_info;
165         struct sn_pcibus_provider *provider;
166         unsigned int cpu;
167
168         cpu = cpumask_first(cpu_mask);
169         sn_irq_info = sn_msi_info[irq].sn_irq_info;
170         if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
171                 return;
172
173         /*
174          * Release XIO resources for the old MSI PCI address
175          */
176
177         read_msi_msg(irq, &msg);
178         sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
179         pdev = sn_pdev->pdi_linux_pcidev;
180         provider = SN_PCIDEV_BUSPROVIDER(pdev);
181
182         bus_addr = (u64)(msg.address_hi) << 32 | (u64)(msg.address_lo);
183         (*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
184         sn_msi_info[irq].pci_addr = 0;
185
186         nasid = cpuid_to_nasid(cpu);
187         slice = cpuid_to_slice(cpu);
188
189         new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
190         sn_msi_info[irq].sn_irq_info = new_irq_info;
191         if (new_irq_info == NULL)
192                 return;
193
194         /*
195          * Map the xio address into bus space
196          */
197
198         bus_addr = (*provider->dma_map_consistent)(pdev,
199                                         new_irq_info->irq_xtalkaddr,
200                                         sizeof(new_irq_info->irq_xtalkaddr),
201                                         SN_DMA_MSI|SN_DMA_ADDR_XIO);
202
203         sn_msi_info[irq].pci_addr = bus_addr;
204         msg.address_hi = (u32)(bus_addr >> 32);
205         msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
206
207         write_msi_msg(irq, &msg);
208         cpumask_copy(irq_desc[irq].affinity, cpu_mask);
209 }
210 #endif /* CONFIG_SMP */
211
212 static void sn_ack_msi_irq(unsigned int irq)
213 {
214         move_native_irq(irq);
215         ia64_eoi();
216 }
217
218 static int sn_msi_retrigger_irq(unsigned int irq)
219 {
220         unsigned int vector = irq;
221         ia64_resend_irq(vector);
222
223         return 1;
224 }
225
226 static struct irq_chip sn_msi_chip = {
227         .name           = "PCI-MSI",
228         .mask           = mask_msi_irq,
229         .unmask         = unmask_msi_irq,
230         .ack            = sn_ack_msi_irq,
231 #ifdef CONFIG_SMP
232         .set_affinity   = sn_set_msi_irq_affinity,
233 #endif
234         .retrigger      = sn_msi_retrigger_irq,
235 };