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 int 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 -1;
 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 -1;
 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         return 0;
 211 }
 212 #endif /* CONFIG_SMP */
 213
 214 static void sn_ack_msi_irq(unsigned int irq)
 215 {
 216         move_native_irq(irq);
 217         ia64_eoi();
 218 }
 219
 220 static int sn_msi_retrigger_irq(unsigned int irq)
 221 {
 222         unsigned int vector = irq;
 223         ia64_resend_irq(vector);
 224
 225         return 1;
 226 }
 227
 228 static struct irq_chip sn_msi_chip = {
 229         .name           = "PCI-MSI",
 230         .mask           = mask_msi_irq,
 231         .unmask         = unmask_msi_irq,
 232         .ack            = sn_ack_msi_irq,
 233 #ifdef CONFIG_SMP
 234         .set_affinity   = sn_set_msi_irq_affinity,
 235 #endif
 236         .retrigger      = sn_msi_retrigger_irq,
 237 };