hw/arm/sysbus-fdt.c - third_party/qemu - Git at Google

 /*
  * ARM Platform Bus device tree generation helpers
  *
  * Copyright (c) 2014 Linaro Limited
  *
  * Authors:
  *  Alex Graf <agraf@suse.de>
  *  Eric Auger <eric.auger@linaro.org>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2 or later, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License along with
  * this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */

 #include "hw/arm/sysbus-fdt.h"
 #include "qemu/error-report.h"
 #include "sysemu/device_tree.h"
 #include "hw/platform-bus.h"
 #include "sysemu/sysemu.h"
 #include "hw/vfio/vfio-platform.h"
 #include "hw/vfio/vfio-calxeda-xgmac.h"
 #include "hw/arm/fdt.h"

 /*
  * internal struct that contains the information to create dynamic
  * sysbus device node
  */
 typedef struct PlatformBusFDTData {
     void *fdt; /* device tree handle */
     int irq_start; /* index of the first IRQ usable by platform bus devices */
     const char *pbus_node_name; /* name of the platform bus node */
     PlatformBusDevice *pbus;
 } PlatformBusFDTData;

 /*
  * struct used when calling the machine init done notifier
  * that constructs the fdt nodes of platform bus devices
  */
 typedef struct PlatformBusFDTNotifierParams {
     Notifier notifier;
     ARMPlatformBusFDTParams *fdt_params;
 } PlatformBusFDTNotifierParams;

 /* struct that associates a device type name and a node creation function */
 typedef struct NodeCreationPair {
     const char *typename;
     int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
 } NodeCreationPair;

 /* Device Specific Code */

 /**
  * add_calxeda_midway_xgmac_fdt_node
  *
  * Generates a simple node with following properties:
  * compatible string, regs, interrupts, dma-coherent
  */
 static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
 {
     PlatformBusFDTData *data = opaque;
     PlatformBusDevice *pbus = data->pbus;
     void *fdt = data->fdt;
     const char *parent_node = data->pbus_node_name;
     int compat_str_len, i, ret = -1;
     char *nodename;
     uint32_t *irq_attr, *reg_attr;
     uint64_t mmio_base, irq_number;
     VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
     VFIODevice *vbasedev = &vdev->vbasedev;

     mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
     nodename = g_strdup_printf("%s/%s@%" PRIx64, parent_node,
                                vbasedev->name, mmio_base);
     qemu_fdt_add_subnode(fdt, nodename);

     compat_str_len = strlen(vdev->compat) + 1;
     qemu_fdt_setprop(fdt, nodename, "compatible",
                           vdev->compat, compat_str_len);

     qemu_fdt_setprop(fdt, nodename, "dma-coherent", "", 0);

     reg_attr = g_new(uint32_t, vbasedev->num_regions * 2);
     for (i = 0; i < vbasedev->num_regions; i++) {
         mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, i);
         reg_attr[2 * i] = cpu_to_be32(mmio_base);
         reg_attr[2 * i + 1] = cpu_to_be32(
                                 memory_region_size(&vdev->regions[i]->mem));
     }
     ret = qemu_fdt_setprop(fdt, nodename, "reg", reg_attr,
                            vbasedev->num_regions * 2 * sizeof(uint32_t));
     if (ret) {
         error_report("could not set reg property of node %s", nodename);
         goto fail_reg;
     }

     irq_attr = g_new(uint32_t, vbasedev->num_irqs * 3);
     for (i = 0; i < vbasedev->num_irqs; i++) {
         irq_number = platform_bus_get_irqn(pbus, sbdev , i)
                          + data->irq_start;
         irq_attr[3 * i] = cpu_to_be32(GIC_FDT_IRQ_TYPE_SPI);
         irq_attr[3 * i + 1] = cpu_to_be32(irq_number);
         irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
     }
     ret = qemu_fdt_setprop(fdt, nodename, "interrupts",
                      irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
     if (ret) {
         error_report("could not set interrupts property of node %s",
                      nodename);
     }
     g_free(irq_attr);
 fail_reg:
     g_free(reg_attr);
     g_free(nodename);
     return ret;
 }

 /* list of supported dynamic sysbus devices */
 static const NodeCreationPair add_fdt_node_functions[] = {
     {TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node},
     {"", NULL}, /* last element */
 };

 /* Generic Code */

 /**
  * add_fdt_node - add the device tree node of a dynamic sysbus device
  *
  * @sbdev: handle to the sysbus device
  * @opaque: handle to the PlatformBusFDTData
  *
  * Checks the sysbus type belongs to the list of device types that
  * are dynamically instantiable and if so call the node creation
  * function.
  */
 static int add_fdt_node(SysBusDevice *sbdev, void *opaque)
 {
     int i, ret;

     for (i = 0; i < ARRAY_SIZE(add_fdt_node_functions); i++) {
         if (!strcmp(object_get_typename(OBJECT(sbdev)),
                     add_fdt_node_functions[i].typename)) {
             ret = add_fdt_node_functions[i].add_fdt_node_fn(sbdev, opaque);
             assert(!ret);
             return 0;
         }
     }
     error_report("Device %s can not be dynamically instantiated",
                      qdev_fw_name(DEVICE(sbdev)));
     exit(1);
 }

 /**
  * add_all_platform_bus_fdt_nodes - create all the platform bus nodes
  *
  * builds the parent platform bus node and all the nodes of dynamic
  * sysbus devices attached to it.
  */
 static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
 {
     const char platcomp[] = "qemu,platform\0simple-bus";
     PlatformBusDevice *pbus;
     DeviceState *dev;
     gchar *node;
     uint64_t addr, size;
     int irq_start, dtb_size;
     struct arm_boot_info *info = fdt_params->binfo;
     const ARMPlatformBusSystemParams *params = fdt_params->system_params;
     const char *intc = fdt_params->intc;
     void *fdt = info->get_dtb(info, &dtb_size);

     /*
      * If the user provided a dtb, we assume the dynamic sysbus nodes
      * already are integrated there. This corresponds to a use case where
      * the dynamic sysbus nodes are complex and their generation is not yet
      * supported. In that case the user can take charge of the guest dt
      * while qemu takes charge of the qom stuff.
      */
     if (info->dtb_filename) {
         return;
     }

     assert(fdt);

     node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
     addr = params->platform_bus_base;
     size = params->platform_bus_size;
     irq_start = params->platform_bus_first_irq;

     /* Create a /platform node that we can put all devices into */
     qemu_fdt_add_subnode(fdt, node);
     qemu_fdt_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp));

     /* Our platform bus region is less than 32bits, so 1 cell is enough for
      * address and size
      */
     qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
     qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
     qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);

     qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);

     dev = qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
     pbus = PLATFORM_BUS_DEVICE(dev);

     /* We can only create dt nodes for dynamic devices when they're ready */
     assert(pbus->done_gathering);

     PlatformBusFDTData data = {
         .fdt = fdt,
         .irq_start = irq_start,
         .pbus_node_name = node,
         .pbus = pbus,
     };

     /* Loop through all dynamic sysbus devices and create their node */
     foreach_dynamic_sysbus_device(add_fdt_node, &data);

     g_free(node);
 }

 static void platform_bus_fdt_notify(Notifier *notifier, void *data)
 {
     PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
                                                 notifier, notifier);

     add_all_platform_bus_fdt_nodes(p->fdt_params);
     g_free(p->fdt_params);
     g_free(p);
 }

 void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
 {
     PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);

     p->fdt_params = fdt_params;
     p->notifier.notify = platform_bus_fdt_notify;
     qemu_add_machine_init_done_notifier(&p->notifier);
 }
	/*
	* ARM Platform Bus device tree generation helpers
	*
	* Copyright (c) 2014 Linaro Limited
	*
	* Authors:
	* Alex Graf <agraf@suse.de>
	* Eric Auger <eric.auger@linaro.org>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2 or later, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License along with
	* this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	#include "hw/arm/sysbus-fdt.h"
	#include "qemu/error-report.h"
	#include "sysemu/device_tree.h"
	#include "hw/platform-bus.h"
	#include "sysemu/sysemu.h"
	#include "hw/vfio/vfio-platform.h"
	#include "hw/vfio/vfio-calxeda-xgmac.h"
	#include "hw/arm/fdt.h"

	/*
	* internal struct that contains the information to create dynamic
	* sysbus device node
	*/
	typedef struct PlatformBusFDTData {
	void fdt; / device tree handle */
	int irq_start; /* index of the first IRQ usable by platform bus devices */
	const char pbus_node_name; / name of the platform bus node */
	PlatformBusDevice *pbus;
	} PlatformBusFDTData;

	/*
	* struct used when calling the machine init done notifier
	* that constructs the fdt nodes of platform bus devices
	*/
	typedef struct PlatformBusFDTNotifierParams {
	Notifier notifier;
	ARMPlatformBusFDTParams *fdt_params;
	} PlatformBusFDTNotifierParams;

	/* struct that associates a device type name and a node creation function */
	typedef struct NodeCreationPair {
	const char *typename;
	int (add_fdt_node_fn)(SysBusDevice sbdev, void *opaque);
	} NodeCreationPair;

	/* Device Specific Code */

	/**
	* add_calxeda_midway_xgmac_fdt_node
	*
	* Generates a simple node with following properties:
	* compatible string, regs, interrupts, dma-coherent
	*/
	static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice sbdev, void opaque)
	{
	PlatformBusFDTData *data = opaque;
	PlatformBusDevice *pbus = data->pbus;
	void *fdt = data->fdt;
	const char *parent_node = data->pbus_node_name;
	int compat_str_len, i, ret = -1;
	char *nodename;
	uint32_t irq_attr, reg_attr;
	uint64_t mmio_base, irq_number;
	VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
	VFIODevice *vbasedev = &vdev->vbasedev;

	mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
	nodename = g_strdup_printf("%s/%s@%" PRIx64, parent_node,
	vbasedev->name, mmio_base);
	qemu_fdt_add_subnode(fdt, nodename);

	compat_str_len = strlen(vdev->compat) + 1;
	qemu_fdt_setprop(fdt, nodename, "compatible",
	vdev->compat, compat_str_len);

	qemu_fdt_setprop(fdt, nodename, "dma-coherent", "", 0);

	reg_attr = g_new(uint32_t, vbasedev->num_regions * 2);
	for (i = 0; i < vbasedev->num_regions; i++) {
	mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, i);
	reg_attr[2 * i] = cpu_to_be32(mmio_base);
	reg_attr[2 * i + 1] = cpu_to_be32(
	memory_region_size(&vdev->regions[i]->mem));
	}
	ret = qemu_fdt_setprop(fdt, nodename, "reg", reg_attr,
	vbasedev->num_regions * 2 * sizeof(uint32_t));
	if (ret) {
	error_report("could not set reg property of node %s", nodename);
	goto fail_reg;
	}

	irq_attr = g_new(uint32_t, vbasedev->num_irqs * 3);
	for (i = 0; i < vbasedev->num_irqs; i++) {
	irq_number = platform_bus_get_irqn(pbus, sbdev , i)
	+ data->irq_start;
	irq_attr[3 * i] = cpu_to_be32(GIC_FDT_IRQ_TYPE_SPI);
	irq_attr[3 * i + 1] = cpu_to_be32(irq_number);
	irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
	}
	ret = qemu_fdt_setprop(fdt, nodename, "interrupts",
	irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
	if (ret) {
	error_report("could not set interrupts property of node %s",
	nodename);
	}
	g_free(irq_attr);
	fail_reg:
	g_free(reg_attr);
	g_free(nodename);
	return ret;
	}

	/* list of supported dynamic sysbus devices */
	static const NodeCreationPair add_fdt_node_functions[] = {
	{TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node},
	{"", NULL}, /* last element */
	};

	/* Generic Code */

	/**
	* add_fdt_node - add the device tree node of a dynamic sysbus device
	*
	* @sbdev: handle to the sysbus device
	* @opaque: handle to the PlatformBusFDTData
	*
	* Checks the sysbus type belongs to the list of device types that
	* are dynamically instantiable and if so call the node creation
	* function.
	*/
	static int add_fdt_node(SysBusDevice sbdev, void opaque)
	{
	int i, ret;

	for (i = 0; i < ARRAY_SIZE(add_fdt_node_functions); i++) {
	if (!strcmp(object_get_typename(OBJECT(sbdev)),
	add_fdt_node_functions[i].typename)) {
	ret = add_fdt_node_functions[i].add_fdt_node_fn(sbdev, opaque);
	assert(!ret);
	return 0;
	}
	}
	error_report("Device %s can not be dynamically instantiated",
	qdev_fw_name(DEVICE(sbdev)));
	exit(1);
	}

	/**
	* add_all_platform_bus_fdt_nodes - create all the platform bus nodes
	*
	* builds the parent platform bus node and all the nodes of dynamic
	* sysbus devices attached to it.
	*/
	static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
	{
	const char platcomp[] = "qemu,platform\0simple-bus";
	PlatformBusDevice *pbus;
	DeviceState *dev;
	gchar *node;
	uint64_t addr, size;
	int irq_start, dtb_size;
	struct arm_boot_info *info = fdt_params->binfo;
	const ARMPlatformBusSystemParams *params = fdt_params->system_params;
	const char *intc = fdt_params->intc;
	void *fdt = info->get_dtb(info, &dtb_size);

	/*
	* If the user provided a dtb, we assume the dynamic sysbus nodes
	* already are integrated there. This corresponds to a use case where
	* the dynamic sysbus nodes are complex and their generation is not yet
	* supported. In that case the user can take charge of the guest dt
	* while qemu takes charge of the qom stuff.
	*/
	if (info->dtb_filename) {
	return;
	}

	assert(fdt);

	node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
	addr = params->platform_bus_base;
	size = params->platform_bus_size;
	irq_start = params->platform_bus_first_irq;

	/* Create a /platform node that we can put all devices into */
	qemu_fdt_add_subnode(fdt, node);
	qemu_fdt_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp));

	/* Our platform bus region is less than 32bits, so 1 cell is enough for
	* address and size
	*/
	qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
	qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
	qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);

	qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);

	dev = qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
	pbus = PLATFORM_BUS_DEVICE(dev);

	/* We can only create dt nodes for dynamic devices when they're ready */
	assert(pbus->done_gathering);

	PlatformBusFDTData data = {
	.fdt = fdt,
	.irq_start = irq_start,
	.pbus_node_name = node,
	.pbus = pbus,
	};

	/* Loop through all dynamic sysbus devices and create their node */
	foreach_dynamic_sysbus_device(add_fdt_node, &data);

	g_free(node);
	}

	static void platform_bus_fdt_notify(Notifier notifier, void data)
	{
	PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
	notifier, notifier);

	add_all_platform_bus_fdt_nodes(p->fdt_params);
	g_free(p->fdt_params);
	g_free(p);
	}

	void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
	{
	PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);

	p->fdt_params = fdt_params;
	p->notifier.notify = platform_bus_fdt_notify;
	qemu_add_machine_init_done_notifier(&p->notifier);
	}