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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ppc64/kernel/vio.c | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/ppc64/kernel/vio.c')
-rw-r--r-- | arch/ppc64/kernel/vio.c | 640 |
1 files changed, 640 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/vio.c b/arch/ppc64/kernel/vio.c new file mode 100644 index 0000000..cdd830c --- /dev/null +++ b/arch/ppc64/kernel/vio.c @@ -0,0 +1,640 @@ +/* + * IBM PowerPC Virtual I/O Infrastructure Support. + * + * Copyright (c) 2003 IBM Corp. + * Dave Engebretsen engebret@us.ibm.com + * Santiago Leon santil@us.ibm.com + * Hollis Blanchard <hollisb@us.ibm.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/init.h> +#include <linux/console.h> +#include <linux/version.h> +#include <linux/module.h> +#include <linux/kobject.h> +#include <linux/mm.h> +#include <linux/dma-mapping.h> +#include <asm/rtas.h> +#include <asm/iommu.h> +#include <asm/dma.h> +#include <asm/ppcdebug.h> +#include <asm/vio.h> +#include <asm/hvcall.h> +#include <asm/iSeries/vio.h> +#include <asm/iSeries/HvTypes.h> +#include <asm/iSeries/HvCallXm.h> +#include <asm/iSeries/HvLpConfig.h> + +#define DBGENTER() pr_debug("%s entered\n", __FUNCTION__) + +extern struct subsystem devices_subsys; /* needed for vio_find_name() */ + +static const struct vio_device_id *vio_match_device( + const struct vio_device_id *, const struct vio_dev *); + +#ifdef CONFIG_PPC_PSERIES +static struct iommu_table *vio_build_iommu_table(struct vio_dev *); +static int vio_num_address_cells; +#endif +static struct vio_dev *vio_bus_device; /* fake "parent" device */ + +#ifdef CONFIG_PPC_ISERIES +static struct vio_dev *__init vio_register_device_iseries(char *type, + uint32_t unit_num); + +static struct iommu_table veth_iommu_table; +static struct iommu_table vio_iommu_table; + +static struct vio_dev _vio_dev = { + .iommu_table = &vio_iommu_table, + .dev.bus = &vio_bus_type +}; +struct device *iSeries_vio_dev = &_vio_dev.dev; +EXPORT_SYMBOL(iSeries_vio_dev); + +#define device_is_compatible(a, b) 1 + +#endif + +/* convert from struct device to struct vio_dev and pass to driver. + * dev->driver has already been set by generic code because vio_bus_match + * succeeded. */ +static int vio_bus_probe(struct device *dev) +{ + struct vio_dev *viodev = to_vio_dev(dev); + struct vio_driver *viodrv = to_vio_driver(dev->driver); + const struct vio_device_id *id; + int error = -ENODEV; + + DBGENTER(); + + if (!viodrv->probe) + return error; + + id = vio_match_device(viodrv->id_table, viodev); + if (id) { + error = viodrv->probe(viodev, id); + } + + return error; +} + +/* convert from struct device to struct vio_dev and pass to driver. */ +static int vio_bus_remove(struct device *dev) +{ + struct vio_dev *viodev = to_vio_dev(dev); + struct vio_driver *viodrv = to_vio_driver(dev->driver); + + DBGENTER(); + + if (viodrv->remove) { + return viodrv->remove(viodev); + } + + /* driver can't remove */ + return 1; +} + +/** + * vio_register_driver: - Register a new vio driver + * @drv: The vio_driver structure to be registered. + */ +int vio_register_driver(struct vio_driver *viodrv) +{ + printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, + viodrv->name); + + /* fill in 'struct driver' fields */ + viodrv->driver.name = viodrv->name; + viodrv->driver.bus = &vio_bus_type; + viodrv->driver.probe = vio_bus_probe; + viodrv->driver.remove = vio_bus_remove; + + return driver_register(&viodrv->driver); +} +EXPORT_SYMBOL(vio_register_driver); + +/** + * vio_unregister_driver - Remove registration of vio driver. + * @driver: The vio_driver struct to be removed form registration + */ +void vio_unregister_driver(struct vio_driver *viodrv) +{ + driver_unregister(&viodrv->driver); +} +EXPORT_SYMBOL(vio_unregister_driver); + +/** + * vio_match_device: - Tell if a VIO device has a matching VIO device id structure. + * @ids: array of VIO device id structures to search in + * @dev: the VIO device structure to match against + * + * Used by a driver to check whether a VIO device present in the + * system is in its list of supported devices. Returns the matching + * vio_device_id structure or NULL if there is no match. + */ +static const struct vio_device_id * vio_match_device(const struct vio_device_id *ids, + const struct vio_dev *dev) +{ + DBGENTER(); + + while (ids->type) { + if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && + device_is_compatible(dev->dev.platform_data, ids->compat)) + return ids; + ids++; + } + return NULL; +} + +#ifdef CONFIG_PPC_ISERIES +void __init iommu_vio_init(void) +{ + struct iommu_table *t; + struct iommu_table_cb cb; + unsigned long cbp; + unsigned long itc_entries; + + cb.itc_busno = 255; /* Bus 255 is the virtual bus */ + cb.itc_virtbus = 0xff; /* Ask for virtual bus */ + + cbp = virt_to_abs(&cb); + HvCallXm_getTceTableParms(cbp); + + itc_entries = cb.itc_size * PAGE_SIZE / sizeof(union tce_entry); + veth_iommu_table.it_size = itc_entries / 2; + veth_iommu_table.it_busno = cb.itc_busno; + veth_iommu_table.it_offset = cb.itc_offset; + veth_iommu_table.it_index = cb.itc_index; + veth_iommu_table.it_type = TCE_VB; + veth_iommu_table.it_blocksize = 1; + + t = iommu_init_table(&veth_iommu_table); + + if (!t) + printk("Virtual Bus VETH TCE table failed.\n"); + + vio_iommu_table.it_size = itc_entries - veth_iommu_table.it_size; + vio_iommu_table.it_busno = cb.itc_busno; + vio_iommu_table.it_offset = cb.itc_offset + + veth_iommu_table.it_size; + vio_iommu_table.it_index = cb.itc_index; + vio_iommu_table.it_type = TCE_VB; + vio_iommu_table.it_blocksize = 1; + + t = iommu_init_table(&vio_iommu_table); + + if (!t) + printk("Virtual Bus VIO TCE table failed.\n"); +} +#endif + +#ifdef CONFIG_PPC_PSERIES +static void probe_bus_pseries(void) +{ + struct device_node *node_vroot, *of_node; + + node_vroot = find_devices("vdevice"); + if ((node_vroot == NULL) || (node_vroot->child == NULL)) + /* this machine doesn't do virtual IO, and that's ok */ + return; + + vio_num_address_cells = prom_n_addr_cells(node_vroot->child); + + /* + * Create struct vio_devices for each virtual device in the device tree. + * Drivers will associate with them later. + */ + for (of_node = node_vroot->child; of_node != NULL; + of_node = of_node->sibling) { + printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node); + vio_register_device_node(of_node); + } +} +#endif + +#ifdef CONFIG_PPC_ISERIES +static void probe_bus_iseries(void) +{ + HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap(); + struct vio_dev *viodev; + int i; + + /* there is only one of each of these */ + vio_register_device_iseries("viocons", 0); + vio_register_device_iseries("vscsi", 0); + + vlan_map = HvLpConfig_getVirtualLanIndexMap(); + for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) { + if ((vlan_map & (0x8000 >> i)) == 0) + continue; + viodev = vio_register_device_iseries("vlan", i); + /* veth is special and has it own iommu_table */ + viodev->iommu_table = &veth_iommu_table; + } + for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++) + vio_register_device_iseries("viodasd", i); + for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++) + vio_register_device_iseries("viocd", i); + for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++) + vio_register_device_iseries("viotape", i); +} +#endif + +/** + * vio_bus_init: - Initialize the virtual IO bus + */ +static int __init vio_bus_init(void) +{ + int err; + + err = bus_register(&vio_bus_type); + if (err) { + printk(KERN_ERR "failed to register VIO bus\n"); + return err; + } + + /* the fake parent of all vio devices, just to give us a nice directory */ + vio_bus_device = kmalloc(sizeof(struct vio_dev), GFP_KERNEL); + if (!vio_bus_device) { + return 1; + } + memset(vio_bus_device, 0, sizeof(struct vio_dev)); + strcpy(vio_bus_device->dev.bus_id, "vio"); + + err = device_register(&vio_bus_device->dev); + if (err) { + printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__, + err); + kfree(vio_bus_device); + return err; + } + +#ifdef CONFIG_PPC_PSERIES + probe_bus_pseries(); +#endif +#ifdef CONFIG_PPC_ISERIES + probe_bus_iseries(); +#endif + + return 0; +} + +__initcall(vio_bus_init); + +/* vio_dev refcount hit 0 */ +static void __devinit vio_dev_release(struct device *dev) +{ + DBGENTER(); + +#ifdef CONFIG_PPC_PSERIES + /* XXX free TCE table */ + of_node_put(dev->platform_data); +#endif + kfree(to_vio_dev(dev)); +} + +#ifdef CONFIG_PPC_PSERIES +static ssize_t viodev_show_devspec(struct device *dev, char *buf) +{ + struct device_node *of_node = dev->platform_data; + + return sprintf(buf, "%s\n", of_node->full_name); +} +DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL); +#endif + +static ssize_t viodev_show_name(struct device *dev, char *buf) +{ + return sprintf(buf, "%s\n", to_vio_dev(dev)->name); +} +DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL); + +static struct vio_dev * __devinit vio_register_device_common( + struct vio_dev *viodev, char *name, char *type, + uint32_t unit_address, struct iommu_table *iommu_table) +{ + DBGENTER(); + + viodev->name = name; + viodev->type = type; + viodev->unit_address = unit_address; + viodev->iommu_table = iommu_table; + /* init generic 'struct device' fields: */ + viodev->dev.parent = &vio_bus_device->dev; + viodev->dev.bus = &vio_bus_type; + viodev->dev.release = vio_dev_release; + + /* register with generic device framework */ + if (device_register(&viodev->dev)) { + printk(KERN_ERR "%s: failed to register device %s\n", + __FUNCTION__, viodev->dev.bus_id); + return NULL; + } + device_create_file(&viodev->dev, &dev_attr_name); + + return viodev; +} + +#ifdef CONFIG_PPC_PSERIES +/** + * vio_register_device_node: - Register a new vio device. + * @of_node: The OF node for this device. + * + * Creates and initializes a vio_dev structure from the data in + * of_node (dev.platform_data) and adds it to the list of virtual devices. + * Returns a pointer to the created vio_dev or NULL if node has + * NULL device_type or compatible fields. + */ +struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node) +{ + struct vio_dev *viodev; + unsigned int *unit_address; + unsigned int *irq_p; + + DBGENTER(); + + /* we need the 'device_type' property, in order to match with drivers */ + if ((NULL == of_node->type)) { + printk(KERN_WARNING + "%s: node %s missing 'device_type'\n", __FUNCTION__, + of_node->name ? of_node->name : "<unknown>"); + return NULL; + } + + unit_address = (unsigned int *)get_property(of_node, "reg", NULL); + if (!unit_address) { + printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__, + of_node->name ? of_node->name : "<unknown>"); + return NULL; + } + + /* allocate a vio_dev for this node */ + viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL); + if (!viodev) { + return NULL; + } + memset(viodev, 0, sizeof(struct vio_dev)); + + viodev->dev.platform_data = of_node_get(of_node); + + viodev->irq = NO_IRQ; + irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL); + if (irq_p) { + int virq = virt_irq_create_mapping(*irq_p); + if (virq == NO_IRQ) { + printk(KERN_ERR "Unable to allocate interrupt " + "number for %s\n", of_node->full_name); + } else + viodev->irq = irq_offset_up(virq); + } + + snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address); + + /* register with generic device framework */ + if (vio_register_device_common(viodev, of_node->name, of_node->type, + *unit_address, vio_build_iommu_table(viodev)) + == NULL) { + /* XXX free TCE table */ + kfree(viodev); + return NULL; + } + device_create_file(&viodev->dev, &dev_attr_devspec); + + return viodev; +} +EXPORT_SYMBOL(vio_register_device_node); +#endif + +#ifdef CONFIG_PPC_ISERIES +/** + * vio_register_device: - Register a new vio device. + * @voidev: The device to register. + */ +static struct vio_dev *__init vio_register_device_iseries(char *type, + uint32_t unit_num) +{ + struct vio_dev *viodev; + + DBGENTER(); + + /* allocate a vio_dev for this node */ + viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL); + if (!viodev) + return NULL; + memset(viodev, 0, sizeof(struct vio_dev)); + + snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num); + + return vio_register_device_common(viodev, viodev->dev.bus_id, type, + unit_num, &vio_iommu_table); +} +#endif + +void __devinit vio_unregister_device(struct vio_dev *viodev) +{ + DBGENTER(); +#ifdef CONFIG_PPC_PSERIES + device_remove_file(&viodev->dev, &dev_attr_devspec); +#endif + device_remove_file(&viodev->dev, &dev_attr_name); + device_unregister(&viodev->dev); +} +EXPORT_SYMBOL(vio_unregister_device); + +#ifdef CONFIG_PPC_PSERIES +/** + * vio_get_attribute: - get attribute for virtual device + * @vdev: The vio device to get property. + * @which: The property/attribute to be extracted. + * @length: Pointer to length of returned data size (unused if NULL). + * + * Calls prom.c's get_property() to return the value of the + * attribute specified by the preprocessor constant @which +*/ +const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length) +{ + return get_property(vdev->dev.platform_data, (char*)which, length); +} +EXPORT_SYMBOL(vio_get_attribute); + +/* vio_find_name() - internal because only vio.c knows how we formatted the + * kobject name + * XXX once vio_bus_type.devices is actually used as a kset in + * drivers/base/bus.c, this function should be removed in favor of + * "device_find(kobj_name, &vio_bus_type)" + */ +static struct vio_dev *vio_find_name(const char *kobj_name) +{ + struct kobject *found; + + found = kset_find_obj(&devices_subsys.kset, kobj_name); + if (!found) + return NULL; + + return to_vio_dev(container_of(found, struct device, kobj)); +} + +/** + * vio_find_node - find an already-registered vio_dev + * @vnode: device_node of the virtual device we're looking for + */ +struct vio_dev *vio_find_node(struct device_node *vnode) +{ + uint32_t *unit_address; + char kobj_name[BUS_ID_SIZE]; + + /* construct the kobject name from the device node */ + unit_address = (uint32_t *)get_property(vnode, "reg", NULL); + if (!unit_address) + return NULL; + snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address); + + return vio_find_name(kobj_name); +} +EXPORT_SYMBOL(vio_find_node); + +/** + * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree. + * @dev: the virtual device. + * + * Returns a pointer to the built tce tree, or NULL if it can't + * find property. +*/ +static struct iommu_table * vio_build_iommu_table(struct vio_dev *dev) +{ + unsigned int *dma_window; + struct iommu_table *newTceTable; + unsigned long offset; + int dma_window_property_size; + + dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size); + if(!dma_window) { + return NULL; + } + + newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL); + + /* There should be some code to extract the phys-encoded offset + using prom_n_addr_cells(). However, according to a comment + on earlier versions, it's always zero, so we don't bother */ + offset = dma_window[1] >> PAGE_SHIFT; + + /* TCE table size - measured in tce entries */ + newTceTable->it_size = dma_window[4] >> PAGE_SHIFT; + /* offset for VIO should always be 0 */ + newTceTable->it_offset = offset; + newTceTable->it_busno = 0; + newTceTable->it_index = (unsigned long)dma_window[0]; + newTceTable->it_type = TCE_VB; + + return iommu_init_table(newTceTable); +} + +int vio_enable_interrupts(struct vio_dev *dev) +{ + int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE); + if (rc != H_Success) { + printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc); + } + return rc; +} +EXPORT_SYMBOL(vio_enable_interrupts); + +int vio_disable_interrupts(struct vio_dev *dev) +{ + int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE); + if (rc != H_Success) { + printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc); + } + return rc; +} +EXPORT_SYMBOL(vio_disable_interrupts); +#endif + +static dma_addr_t vio_map_single(struct device *dev, void *vaddr, + size_t size, enum dma_data_direction direction) +{ + return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size, + direction); +} + +static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction direction) +{ + iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size, + direction); +} + +static int vio_map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction) +{ + return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist, + nelems, direction); +} + +static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction) +{ + iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction); +} + +static void *vio_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, unsigned int __nocast flag) +{ + return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size, + dma_handle, flag); +} + +static void vio_free_coherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle) +{ + iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr, + dma_handle); +} + +static int vio_dma_supported(struct device *dev, u64 mask) +{ + return 1; +} + +struct dma_mapping_ops vio_dma_ops = { + .alloc_coherent = vio_alloc_coherent, + .free_coherent = vio_free_coherent, + .map_single = vio_map_single, + .unmap_single = vio_unmap_single, + .map_sg = vio_map_sg, + .unmap_sg = vio_unmap_sg, + .dma_supported = vio_dma_supported, +}; + +static int vio_bus_match(struct device *dev, struct device_driver *drv) +{ + const struct vio_dev *vio_dev = to_vio_dev(dev); + struct vio_driver *vio_drv = to_vio_driver(drv); + const struct vio_device_id *ids = vio_drv->id_table; + const struct vio_device_id *found_id; + + DBGENTER(); + + if (!ids) + return 0; + + found_id = vio_match_device(ids, vio_dev); + if (found_id) + return 1; + + return 0; +} + +struct bus_type vio_bus_type = { + .name = "vio", + .match = vio_bus_match, +}; + +EXPORT_SYMBOL(vio_bus_type); |