hw/arm/sysbus-fdt.c

   1 /*
   2  * ARM Platform Bus device tree generation helpers
   3  *
   4  * Copyright (c) 2014 Linaro Limited
   5  *
   6  * Authors:
   7  *  Alex Graf <agraf@suse.de>
   8  *  Eric Auger <eric.auger@linaro.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms and conditions of the GNU General Public License,
  12  * version 2 or later, as published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along with
  20  * this program.  If not, see <http://www.gnu.org/licenses/>.
  21  *
  22  */
  23
  24 #include "hw/arm/sysbus-fdt.h"
  25 #include "qemu/error-report.h"
  26 #include "sysemu/device_tree.h"
  27 #include "hw/platform-bus.h"
  28 #include "sysemu/sysemu.h"
  29 #include "hw/vfio/vfio-platform.h"
  30 #include "hw/vfio/vfio-calxeda-xgmac.h"
  31 #include "hw/arm/fdt.h"
  32
  33 /*
  34  * internal struct that contains the information to create dynamic
  35  * sysbus device node
  36  */
  37 typedef struct PlatformBusFDTData {
  38     void *fdt; /* device tree handle */
  39     int irq_start; /* index of the first IRQ usable by platform bus devices */
  40     const char *pbus_node_name; /* name of the platform bus node */
  41     PlatformBusDevice *pbus;
  42 } PlatformBusFDTData;
  43
  44 /*
  45  * struct used when calling the machine init done notifier
  46  * that constructs the fdt nodes of platform bus devices
  47  */
  48 typedef struct PlatformBusFDTNotifierParams {
  49     Notifier notifier;
  50     ARMPlatformBusFDTParams *fdt_params;
  51 } PlatformBusFDTNotifierParams;
  52
  53 /* struct that associates a device type name and a node creation function */
  54 typedef struct NodeCreationPair {
  55     const char *typename;
  56     int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
  57 } NodeCreationPair;
  58
  59 /* Device Specific Code */
  60
  61 /**
  62  * add_calxeda_midway_xgmac_fdt_node
  63  *
  64  * Generates a simple node with following properties:
  65  * compatible string, regs, interrupts, dma-coherent
  66  */
  67 static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
  68 {
  69     PlatformBusFDTData *data = opaque;
  70     PlatformBusDevice *pbus = data->pbus;
  71     void *fdt = data->fdt;
  72     const char *parent_node = data->pbus_node_name;
  73     int compat_str_len, i, ret = -1;
  74     char *nodename;
  75     uint32_t *irq_attr, *reg_attr;
  76     uint64_t mmio_base, irq_number;
  77     VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
  78     VFIODevice *vbasedev = &vdev->vbasedev;
  79
  80     mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
  81     nodename = g_strdup_printf("%s/%s@%" PRIx64, parent_node,
  82                                vbasedev->name, mmio_base);
  83     qemu_fdt_add_subnode(fdt, nodename);
  84
  85     compat_str_len = strlen(vdev->compat) + 1;
  86     qemu_fdt_setprop(fdt, nodename, "compatible",
  87                           vdev->compat, compat_str_len);
  88
  89     qemu_fdt_setprop(fdt, nodename, "dma-coherent", "", 0);
  90
  91     reg_attr = g_new(uint32_t, vbasedev->num_regions * 2);
  92     for (i = 0; i < vbasedev->num_regions; i++) {
  93         mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, i);
  94         reg_attr[2 * i] = cpu_to_be32(mmio_base);
  95         reg_attr[2 * i + 1] = cpu_to_be32(
  96                                 memory_region_size(&vdev->regions[i]->mem));
  97     }
  98     ret = qemu_fdt_setprop(fdt, nodename, "reg", reg_attr,
  99                            vbasedev->num_regions * 2 * sizeof(uint32_t));
 100     if (ret) {
 101         error_report("could not set reg property of node %s", nodename);
 102         goto fail_reg;
 103     }
 104
 105     irq_attr = g_new(uint32_t, vbasedev->num_irqs * 3);
 106     for (i = 0; i < vbasedev->num_irqs; i++) {
 107         irq_number = platform_bus_get_irqn(pbus, sbdev , i)
 108                          + data->irq_start;
 109         irq_attr[3 * i] = cpu_to_be32(GIC_FDT_IRQ_TYPE_SPI);
 110         irq_attr[3 * i + 1] = cpu_to_be32(irq_number);
 111         irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
 112     }
 113     ret = qemu_fdt_setprop(fdt, nodename, "interrupts",
 114                      irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
 115     if (ret) {
 116         error_report("could not set interrupts property of node %s",
 117                      nodename);
 118     }
 119     g_free(irq_attr);
 120 fail_reg:
 121     g_free(reg_attr);
 122     g_free(nodename);
 123     return ret;
 124 }
 125
 126 /* list of supported dynamic sysbus devices */
 127 static const NodeCreationPair add_fdt_node_functions[] = {
 128     {TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node},
 129     {"", NULL}, /* last element */
 130 };
 131
 132 /* Generic Code */
 133
 134 /**
 135  * add_fdt_node - add the device tree node of a dynamic sysbus device
 136  *
 137  * @sbdev: handle to the sysbus device
 138  * @opaque: handle to the PlatformBusFDTData
 139  *
 140  * Checks the sysbus type belongs to the list of device types that
 141  * are dynamically instantiable and if so call the node creation
 142  * function.
 143  */
 144 static int add_fdt_node(SysBusDevice *sbdev, void *opaque)
 145 {
 146     int i, ret;
 147
 148     for (i = 0; i < ARRAY_SIZE(add_fdt_node_functions); i++) {
 149         if (!strcmp(object_get_typename(OBJECT(sbdev)),
 150                     add_fdt_node_functions[i].typename)) {
 151             ret = add_fdt_node_functions[i].add_fdt_node_fn(sbdev, opaque);
 152             assert(!ret);
 153             return 0;
 154         }
 155     }
 156     error_report("Device %s can not be dynamically instantiated",
 157                      qdev_fw_name(DEVICE(sbdev)));
 158     exit(1);
 159 }
 160
 161 /**
 162  * add_all_platform_bus_fdt_nodes - create all the platform bus nodes
 163  *
 164  * builds the parent platform bus node and all the nodes of dynamic
 165  * sysbus devices attached to it.
 166  */
 167 static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
 168 {
 169     const char platcomp[] = "qemu,platform\0simple-bus";
 170     PlatformBusDevice *pbus;
 171     DeviceState *dev;
 172     gchar *node;
 173     uint64_t addr, size;
 174     int irq_start, dtb_size;
 175     struct arm_boot_info *info = fdt_params->binfo;
 176     const ARMPlatformBusSystemParams *params = fdt_params->system_params;
 177     const char *intc = fdt_params->intc;
 178     void *fdt = info->get_dtb(info, &dtb_size);
 179
 180     /*
 181      * If the user provided a dtb, we assume the dynamic sysbus nodes
 182      * already are integrated there. This corresponds to a use case where
 183      * the dynamic sysbus nodes are complex and their generation is not yet
 184      * supported. In that case the user can take charge of the guest dt
 185      * while qemu takes charge of the qom stuff.
 186      */
 187     if (info->dtb_filename) {
 188         return;
 189     }
 190
 191     assert(fdt);
 192
 193     node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
 194     addr = params->platform_bus_base;
 195     size = params->platform_bus_size;
 196     irq_start = params->platform_bus_first_irq;
 197
 198     /* Create a /platform node that we can put all devices into */
 199     qemu_fdt_add_subnode(fdt, node);
 200     qemu_fdt_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp));
 201
 202     /* Our platform bus region is less than 32bits, so 1 cell is enough for
 203      * address and size
 204      */
 205     qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
 206     qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
 207     qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);
 208
 209     qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);
 210
 211     dev = qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
 212     pbus = PLATFORM_BUS_DEVICE(dev);
 213
 214     /* We can only create dt nodes for dynamic devices when they're ready */
 215     assert(pbus->done_gathering);
 216
 217     PlatformBusFDTData data = {
 218         .fdt = fdt,
 219         .irq_start = irq_start,
 220         .pbus_node_name = node,
 221         .pbus = pbus,
 222     };
 223
 224     /* Loop through all dynamic sysbus devices and create their node */
 225     foreach_dynamic_sysbus_device(add_fdt_node, &data);
 226
 227     g_free(node);
 228 }
 229
 230 static void platform_bus_fdt_notify(Notifier *notifier, void *data)
 231 {
 232     PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
 233                                                 notifier, notifier);
 234
 235     add_all_platform_bus_fdt_nodes(p->fdt_params);
 236     g_free(p->fdt_params);
 237     g_free(p);
 238 }
 239
 240 void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
 241 {
 242     PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);
 243
 244     p->fdt_params = fdt_params;
 245     p->notifier.notify = platform_bus_fdt_notify;
 246     qemu_add_machine_init_done_notifier(&p->notifier);
 247 }