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 #include <linux/slab.h>
  15
  16 #include <asm/sn/addrs.h>
  17 #include <asm/sn/intr.h>
  18 #include <asm/sn/pcibus_provider_defs.h>
  19 #include <asm/sn/pcidev.h>
  20 #include <asm/sn/nodepda.h>
  21
  22 struct sn_msi_info {
  23         u64 pci_addr;
  24         struct sn_irq_info *sn_irq_info;
  25 };
  26
  27 static struct sn_msi_info sn_msi_info[NR_IRQS];
  28
  29 static struct irq_chip sn_msi_chip;
  30
  31 void sn_teardown_msi_irq(unsigned int irq)
  32 {
  33         nasid_t nasid;
  34         int widget;
  35         struct pci_dev *pdev;
  36         struct pcidev_info *sn_pdev;
  37         struct sn_irq_info *sn_irq_info;
  38         struct pcibus_bussoft *bussoft;
  39         struct sn_pcibus_provider *provider;
  40
  41         sn_irq_info = sn_msi_info[irq].sn_irq_info;
  42         if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
  43                 return;
  44
  45         sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
  46         pdev = sn_pdev->pdi_linux_pcidev;
  47         provider = SN_PCIDEV_BUSPROVIDER(pdev);
  48
  49         (*provider->dma_unmap)(pdev,
  50                                sn_msi_info[irq].pci_addr,
  51                                PCI_DMA_FROMDEVICE);
  52         sn_msi_info[irq].pci_addr = 0;
  53
  54         bussoft = SN_PCIDEV_BUSSOFT(pdev);
  55         nasid = NASID_GET(bussoft->bs_base);
  56         widget = (nasid & 1) ?
  57                         TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
  58                         SWIN_WIDGETNUM(bussoft->bs_base);
  59
  60         sn_intr_free(nasid, widget, sn_irq_info);
  61         sn_msi_info[irq].sn_irq_info = NULL;
  62
  63         destroy_irq(irq);
  64 }
  65
  66 int sn_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *entry)
  67 {
  68         struct msi_msg msg;
  69         int widget;
  70         int status;
  71         nasid_t nasid;
  72         u64 bus_addr;
  73         struct sn_irq_info *sn_irq_info;
  74         struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
  75         struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
  76         int irq;
  77
  78         if (!entry->msi_attrib.is_64)
  79                 return -EINVAL;
  80
  81         if (bussoft == NULL)
  82                 return -EINVAL;
  83
  84         if (provider == NULL || provider->dma_map_consistent == NULL)
  85                 return -EINVAL;
  86
  87         irq = create_irq();
  88         if (irq < 0)
  89                 return irq;
  90
  91         /*
  92          * Set up the vector plumbing.  Let the prom (via sn_intr_alloc)
  93          * decide which cpu to direct this msi at by default.
  94          */
  95
  96         nasid = NASID_GET(bussoft->bs_base);
  97         widget = (nasid & 1) ?
  98                         TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
  99                         SWIN_WIDGETNUM(bussoft->bs_base);
 100
 101         sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
 102         if (! sn_irq_info) {
 103                 destroy_irq(irq);
 104                 return -ENOMEM;
 105         }
 106
 107         status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
 108         if (status) {
 109                 kfree(sn_irq_info);
 110                 destroy_irq(irq);
 111                 return -ENOMEM;
 112         }
 113
 114         sn_irq_info->irq_int_bit = -1;          /* mark this as an MSI irq */
 115         sn_irq_fixup(pdev, sn_irq_info);
 116
 117         /* Prom probably should fill these in, but doesn't ... */
 118         sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
 119         sn_irq_info->irq_bridge = (void *)bussoft->bs_base;
 120
 121         /*
 122          * Map the xio address into bus space
 123          */
 124         bus_addr = (*provider->dma_map_consistent)(pdev,
 125                                         sn_irq_info->irq_xtalkaddr,
 126                                         sizeof(sn_irq_info->irq_xtalkaddr),
 127                                         SN_DMA_MSI|SN_DMA_ADDR_XIO);
 128         if (! bus_addr) {
 129                 sn_intr_free(nasid, widget, sn_irq_info);
 130                 kfree(sn_irq_info);
 131                 destroy_irq(irq);
 132                 return -ENOMEM;
 133         }
 134
 135         sn_msi_info[irq].sn_irq_info = sn_irq_info;
 136         sn_msi_info[irq].pci_addr = bus_addr;
 137
 138         msg.address_hi = (u32)(bus_addr >> 32);
 139         msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
 140
 141         /*
 142          * In the SN platform, bit 16 is a "send vector" bit which
 143          * must be present in order to move the vector through the system.
 144          */
 145         msg.data = 0x100 + irq;
 146
 147         irq_set_msi_desc(irq, entry);
 148         write_msi_msg(irq, &msg);
 149         irq_set_chip_and_handler(irq, &sn_msi_chip, handle_edge_irq);
 150
 151         return 0;
 152 }
 153
 154 #ifdef CONFIG_SMP
 155 static int sn_set_msi_irq_affinity(struct irq_data *data,
 156                                    const struct cpumask *cpu_mask, bool force)
 157 {
 158         struct msi_msg msg;
 159         int slice;
 160         nasid_t nasid;
 161         u64 bus_addr;
 162         struct pci_dev *pdev;
 163         struct pcidev_info *sn_pdev;
 164         struct sn_irq_info *sn_irq_info;
 165         struct sn_irq_info *new_irq_info;
 166         struct sn_pcibus_provider *provider;
 167         unsigned int cpu, irq = data->irq;
 168
 169         cpu = cpumask_first_and(cpu_mask, cpu_online_mask);
 170         sn_irq_info = sn_msi_info[irq].sn_irq_info;
 171         if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
 172                 return -1;
 173
 174         /*
 175          * Release XIO resources for the old MSI PCI address
 176          */
 177
 178         get_cached_msi_msg(irq, &msg);
 179         sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
 180         pdev = sn_pdev->pdi_linux_pcidev;
 181         provider = SN_PCIDEV_BUSPROVIDER(pdev);
 182
 183         bus_addr = (u64)(msg.address_hi) << 32 | (u64)(msg.address_lo);
 184         (*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
 185         sn_msi_info[irq].pci_addr = 0;
 186
 187         nasid = cpuid_to_nasid(cpu);
 188         slice = cpuid_to_slice(cpu);
 189
 190         new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
 191         sn_msi_info[irq].sn_irq_info = new_irq_info;
 192         if (new_irq_info == NULL)
 193                 return -1;
 194
 195         /*
 196          * Map the xio address into bus space
 197          */
 198
 199         bus_addr = (*provider->dma_map_consistent)(pdev,
 200                                         new_irq_info->irq_xtalkaddr,
 201                                         sizeof(new_irq_info->irq_xtalkaddr),
 202                                         SN_DMA_MSI|SN_DMA_ADDR_XIO);
 203
 204         sn_msi_info[irq].pci_addr = bus_addr;
 205         msg.address_hi = (u32)(bus_addr >> 32);
 206         msg.address_lo = (u32)(bus_addr & 0x00000000ffffffff);
 207
 208         write_msi_msg(irq, &msg);
 209         cpumask_copy(data->affinity, cpu_mask);
 210
 211         return 0;
 212 }
 213 #endif /* CONFIG_SMP */
 214
 215 static void sn_ack_msi_irq(struct irq_data *data)
 216 {
 217         irq_move_irq(data);
 218         ia64_eoi();
 219 }
 220
 221 static int sn_msi_retrigger_irq(struct irq_data *data)
 222 {
 223         unsigned int vector = data->irq;
 224         ia64_resend_irq(vector);
 225
 226         return 1;
 227 }
 228
 229 static struct irq_chip sn_msi_chip = {
 230         .name                   = "PCI-MSI",
 231         .irq_mask               = mask_msi_irq,
 232         .irq_unmask             = unmask_msi_irq,
 233         .irq_ack                = sn_ack_msi_irq,
 234 #ifdef CONFIG_SMP
 235         .irq_set_affinity       = sn_set_msi_irq_affinity,
 236 #endif
 237         .irq_retrigger          = sn_msi_retrigger_irq,
 238 };