arch/ppc64/kernel/iSeries_vio.c

   1 /*
   2  * IBM PowerPC iSeries Virtual I/O Infrastructure Support.
   3  *
   4  *    Copyright (c) 2005 Stephen Rothwell, IBM Corp.
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11 #include <linux/types.h>
  12 #include <linux/device.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/vio.h>
  16 #include <asm/iommu.h>
  17 #include <asm/abs_addr.h>
  18 #include <asm/page.h>
  19 #include <asm/iSeries/vio.h>
  20 #include <asm/iSeries/HvTypes.h>
  21 #include <asm/iSeries/HvLpConfig.h>
  22 #include <asm/iSeries/HvCallXm.h>
  23
  24 struct device *iSeries_vio_dev = &vio_bus_device.dev;
  25 EXPORT_SYMBOL(iSeries_vio_dev);
  26
  27 static struct iommu_table veth_iommu_table;
  28 static struct iommu_table vio_iommu_table;
  29
  30 static void __init iommu_vio_init(void)
  31 {
  32         struct iommu_table *t;
  33         struct iommu_table_cb cb;
  34         unsigned long cbp;
  35         unsigned long itc_entries;
  36
  37         cb.itc_busno = 255;    /* Bus 255 is the virtual bus */
  38         cb.itc_virtbus = 0xff; /* Ask for virtual bus */
  39
  40         cbp = virt_to_abs(&cb);
  41         HvCallXm_getTceTableParms(cbp);
  42
  43         itc_entries = cb.itc_size * PAGE_SIZE / sizeof(union tce_entry);
  44         veth_iommu_table.it_size        = itc_entries / 2;
  45         veth_iommu_table.it_busno       = cb.itc_busno;
  46         veth_iommu_table.it_offset      = cb.itc_offset;
  47         veth_iommu_table.it_index       = cb.itc_index;
  48         veth_iommu_table.it_type        = TCE_VB;
  49         veth_iommu_table.it_blocksize   = 1;
  50
  51         t = iommu_init_table(&veth_iommu_table);
  52
  53         if (!t)
  54                 printk("Virtual Bus VETH TCE table failed.\n");
  55
  56         vio_iommu_table.it_size         = itc_entries - veth_iommu_table.it_size;
  57         vio_iommu_table.it_busno        = cb.itc_busno;
  58         vio_iommu_table.it_offset       = cb.itc_offset +
  59                                           veth_iommu_table.it_size;
  60         vio_iommu_table.it_index        = cb.itc_index;
  61         vio_iommu_table.it_type         = TCE_VB;
  62         vio_iommu_table.it_blocksize    = 1;
  63
  64         t = iommu_init_table(&vio_iommu_table);
  65
  66         if (!t)
  67                 printk("Virtual Bus VIO TCE table failed.\n");
  68 }
  69
  70 /**
  71  * vio_register_device_iseries: - Register a new iSeries vio device.
  72  * @voidev:     The device to register.
  73  */
  74 static struct vio_dev *__init vio_register_device_iseries(char *type,
  75                 uint32_t unit_num)
  76 {
  77         struct vio_dev *viodev;
  78
  79         /* allocate a vio_dev for this device */
  80         viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
  81         if (!viodev)
  82                 return NULL;
  83         memset(viodev, 0, sizeof(struct vio_dev));
  84
  85         snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num);
  86
  87         viodev->name = viodev->dev.bus_id;
  88         viodev->type = type;
  89         viodev->unit_address = unit_num;
  90         viodev->iommu_table = &vio_iommu_table;
  91         if (vio_register_device(viodev) == NULL) {
  92                 kfree(viodev);
  93                 return NULL;
  94         }
  95         return viodev;
  96 }
  97
  98 void __init probe_bus_iseries(void)
  99 {
 100         HvLpIndexMap vlan_map;
 101         struct vio_dev *viodev;
 102         int i;
 103
 104         /* there is only one of each of these */
 105         vio_register_device_iseries("viocons", 0);
 106         vio_register_device_iseries("vscsi", 0);
 107
 108         vlan_map = HvLpConfig_getVirtualLanIndexMap();
 109         for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
 110                 if ((vlan_map & (0x8000 >> i)) == 0)
 111                         continue;
 112                 viodev = vio_register_device_iseries("vlan", i);
 113                 /* veth is special and has it own iommu_table */
 114                 viodev->iommu_table = &veth_iommu_table;
 115         }
 116         for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
 117                 vio_register_device_iseries("viodasd", i);
 118         for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
 119                 vio_register_device_iseries("viocd", i);
 120         for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
 121                 vio_register_device_iseries("viotape", i);
 122 }
 123
 124 /**
 125  * vio_match_device_iseries: - Tell if a iSeries VIO device matches a
 126  *      vio_device_id
 127  */
 128 static int vio_match_device_iseries(const struct vio_device_id *id,
 129                 const struct vio_dev *dev)
 130 {
 131         return strncmp(dev->type, id->type, strlen(id->type)) == 0;
 132 }
 133
 134 static struct vio_bus_ops vio_bus_ops_iseries = {
 135         .match = vio_match_device_iseries,
 136 };
 137
 138 /**
 139  * vio_bus_init_iseries: - Initialize the iSeries virtual IO bus
 140  */
 141 static int __init vio_bus_init_iseries(void)
 142 {
 143         int err;
 144
 145         err = vio_bus_init(&vio_bus_ops_iseries);
 146         if (err == 0) {
 147                 iommu_vio_init();
 148                 vio_bus_device.iommu_table = &vio_iommu_table;
 149                 iSeries_vio_dev = &vio_bus_device.dev;
 150                 probe_bus_iseries();
 151         }
 152         return err;
 153 }
 154
 155 __initcall(vio_bus_init_iseries);