| /* |
| * (c) 1999--2000 Martin Mares <mj@suse.cz> |
| * (c) 2003 Eric Biederman <ebiederm@xmission.com> |
| * (c) 2003 Linux Networx |
| */ |
| /* lots of mods by ron minnich (rminnich@lanl.gov), with |
| * the final architecture guidance from Tom Merritt (tjm@codegen.com) |
| * In particular, we changed from the one-pass original version to |
| * Tom's recommended multiple-pass version. I wasn't sure about doing |
| * it with multiple passes, until I actually started doing it and saw |
| * the wisdom of Tom's recommendations ... |
| * |
| * Lots of cleanups by Eric Biederman to handle bridges, and to |
| * handle resource allocation for non-pci devices. |
| */ |
| |
| #include <console/console.h> |
| #include <bitops.h> |
| #include <arch/io.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <smp/spinlock.h> |
| |
| /** Linked list of ALL devices */ |
| struct device *all_devices = &dev_root; |
| /** Pointer to the last device */ |
| static struct device **last_dev_p = &dev_root.next; |
| |
| /** The upper limit of MEM resource of the devices. |
| * Reserve 20M for the system */ |
| #define DEVICE_MEM_HIGH 0xFEBFFFFFUL |
| /** The lower limit of IO resource of the devices. |
| * Reserve 4k for ISA/Legacy devices */ |
| #define DEVICE_IO_START 0x1000 |
| |
| /** |
| * @brief Allocate a new device structure. |
| * |
| * Allocte a new device structure and attached it to the device tree as a |
| * child of the parent bus. |
| * |
| * @param parent parent bus the newly created device attached to. |
| * @param path path to the device to be created. |
| * |
| * @return pointer to the newly created device structure. |
| * |
| * @see device_path |
| */ |
| device_t alloc_dev(struct bus *parent, struct device_path *path) |
| { |
| device_t dev, child; |
| int link; |
| |
| spin_lock(&dev_lock); |
| /* Find the last child of our parent */ |
| for(child = parent->children; child && child->sibling; ) { |
| child = child->sibling; |
| } |
| dev = malloc(sizeof(*dev)); |
| if (dev == 0) { |
| die("DEV: out of memory.\n"); |
| } |
| memset(dev, 0, sizeof(*dev)); |
| memcpy(&dev->path, path, sizeof(*path)); |
| |
| |
| /* Initialize the back pointers in the link fields */ |
| for(link = 0; link < MAX_LINKS; link++) { |
| dev->link[link].dev = dev; |
| dev->link[link].link = link; |
| } |
| |
| /* By default devices are enabled */ |
| dev->enabled = 1; |
| |
| /* Add the new device to the list of children of the bus. */ |
| dev->bus = parent; |
| if (child) { |
| child->sibling = dev; |
| } else { |
| parent->children = dev; |
| } |
| |
| /* Append a new device to the global device list. |
| * The list is used to find devices once everything is set up. |
| */ |
| *last_dev_p = dev; |
| last_dev_p = &dev->next; |
| |
| spin_unlock(&dev_lock); |
| return dev; |
| } |
| |
| /** |
| * @brief round a number up to an alignment. |
| * @param val the starting value |
| * @param roundup Alignment as a power of two |
| * @returns rounded up number |
| */ |
| static unsigned long round(unsigned long val, unsigned long roundup) |
| { |
| /* ROUNDUP MUST BE A POWER OF TWO. */ |
| unsigned long inverse; |
| inverse = ~(roundup - 1); |
| val += (roundup - 1); |
| val &= inverse; |
| return val; |
| } |
| |
| static unsigned long round_down(unsigned long val, unsigned long round_down) |
| { |
| /* ROUND_DOWN MUST BE A POWER OF TWO. */ |
| unsigned long inverse; |
| inverse = ~(round_down - 1); |
| val &= inverse; |
| return val; |
| } |
| |
| |
| /** Read the resources on all devices of a given bus. |
| * @param bus bus to read the resources on. |
| */ |
| static void read_resources(struct bus *bus) |
| { |
| struct device *curdev; |
| |
| /* Walk through all of the devices and find which resources they need. */ |
| for(curdev = bus->children; curdev; curdev = curdev->sibling) { |
| unsigned links; |
| int i; |
| if (curdev->resources > 0) { |
| continue; |
| } |
| if (!curdev->ops || !curdev->ops->read_resources) { |
| printk_err("%s missing read_resources\n", |
| dev_path(curdev)); |
| continue; |
| } |
| if (!curdev->enabled) { |
| continue; |
| } |
| curdev->ops->read_resources(curdev); |
| /* Read in subtractive resources behind the current device */ |
| links = 0; |
| for(i = 0; i < curdev->resources; i++) { |
| struct resource *resource; |
| resource = &curdev->resource[i]; |
| if ((resource->flags & IORESOURCE_SUBTRACTIVE) && |
| (!(links & (1 << resource->index)))) |
| { |
| links |= (1 << resource->index); |
| read_resources(&curdev->link[resource->index]); |
| |
| } |
| } |
| } |
| } |
| |
| struct pick_largest_state { |
| struct resource *last; |
| struct device *result_dev; |
| struct resource *result; |
| int seen_last; |
| }; |
| |
| static void pick_largest_resource(struct pick_largest_state *state, |
| struct device *dev, struct resource *resource) |
| { |
| struct resource *last; |
| last = state->last; |
| /* Be certain to pick the successor to last */ |
| if (resource == last) { |
| state->seen_last = 1; |
| return; |
| } |
| if (last && ( |
| (last->align < resource->align) || |
| ((last->align == resource->align) && |
| (last->size < resource->size)) || |
| ((last->align == resource->align) && |
| (last->size == resource->size) && |
| (!state->seen_last)))) { |
| return; |
| } |
| if (!state->result || |
| (state->result->align < resource->align) || |
| ((state->result->align == resource->align) && |
| (state->result->size < resource->size))) { |
| state->result_dev = dev; |
| state->result = resource; |
| } |
| } |
| |
| static void find_largest_resource(struct pick_largest_state *state, |
| struct bus *bus, unsigned long type_mask, unsigned long type) |
| { |
| struct device *curdev; |
| for(curdev = bus->children; curdev; curdev = curdev->sibling) { |
| int i; |
| for(i = 0; i < curdev->resources; i++) { |
| struct resource *resource = &curdev->resource[i]; |
| /* If it isn't the right kind of resource ignore it */ |
| if ((resource->flags & type_mask) != type) { |
| continue; |
| } |
| /* If it is a subtractive resource recurse */ |
| if (resource->flags & IORESOURCE_SUBTRACTIVE) { |
| struct bus *subbus; |
| subbus = &curdev->link[resource->index]; |
| find_largest_resource(state, subbus, type_mask, type); |
| continue; |
| } |
| /* See if this is the largest resource */ |
| pick_largest_resource(state, curdev, resource); |
| } |
| } |
| } |
| |
| static struct device *largest_resource(struct bus *bus, |
| struct resource **result_res, |
| unsigned long type_mask, |
| unsigned long type) |
| { |
| struct pick_largest_state state; |
| |
| state.last = *result_res; |
| state.result_dev = 0; |
| state.result = 0; |
| state.seen_last = 0; |
| |
| find_largest_resource(&state, bus, type_mask, type); |
| |
| *result_res = state.result; |
| return state.result_dev; |
| } |
| |
| /* Compute allocate resources is the guts of the resource allocator. |
| * |
| * The problem. |
| * - Allocate resources locations for every device. |
| * - Don't overlap, and follow the rules of bridges. |
| * - Don't overlap with resources in fixed locations. |
| * - Be efficient so we don't have ugly strategies. |
| * |
| * The strategy. |
| * - Devices that have fixed addresses are the minority so don't |
| * worry about them too much. Instead only use part of the address |
| * space for devices with programmable addresses. This easily handles |
| * everything except bridges. |
| * |
| * - PCI devices are required to have thier sizes and their alignments |
| * equal. In this case an optimal solution to the packing problem |
| * exists. Allocate all devices from highest alignment to least |
| * alignment or vice versa. Use this. |
| * |
| * - So we can handle more than PCI run two allocation passes on |
| * bridges. The first to see how large the resources are behind |
| * the bridge, and what their alignment requirements are. The |
| * second to assign a safe address to the devices behind the |
| * bridge. This allows me to treat a bridge as just a device with |
| * a couple of resources, and not need to special case it in the |
| * allocator. Also this allows handling of other types of bridges. |
| * |
| */ |
| |
| void compute_allocate_resource( |
| struct bus *bus, |
| struct resource *bridge, |
| unsigned long type_mask, |
| unsigned long type) |
| { |
| struct device *dev; |
| struct resource *resource; |
| resource_t base; |
| unsigned long align, min_align; |
| min_align = 0; |
| base = bridge->base; |
| |
| printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d\n", |
| dev_path(bus->dev), |
| (bridge->flags & IORESOURCE_IO)? "io": |
| (bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem", |
| base, bridge->size, bridge->align, bridge->gran); |
| |
| |
| /* We want different minimum alignments for different kinds of |
| * resources. These minimums are not device type specific |
| * but resource type specific. |
| */ |
| if (bridge->flags & IORESOURCE_IO) { |
| min_align = log2(DEVICE_IO_ALIGN); |
| } |
| if (bridge->flags & IORESOURCE_MEM) { |
| min_align = log2(DEVICE_MEM_ALIGN); |
| } |
| |
| /* Make certain I have read in all of the resources */ |
| read_resources(bus); |
| |
| /* Remember I haven't found anything yet. */ |
| resource = 0; |
| |
| /* Walk through all the devices on the current bus and |
| * compute the addresses. |
| */ |
| while((dev = largest_resource(bus, &resource, type_mask, type))) { |
| resource_t size; |
| /* Do NOT I repeat do not ignore resources which have zero size. |
| * If they need to be ignored dev->read_resources should not even |
| * return them. Some resources must be set even when they have |
| * no size. PCI bridge resources are a good example of this. |
| */ |
| |
| /* Propogate the resource alignment to the bridge register */ |
| if (resource->align > bridge->align) { |
| bridge->align = resource->align; |
| } |
| |
| /* Propogate the resource limit to the bridge register */ |
| if (bridge->limit > resource->limit) { |
| bridge->limit = resource->limit; |
| } |
| /* Artificially deny limits between DEVICE_MEM_HIGH and 0xffffffff */ |
| if ((bridge->limit > DEVICE_MEM_HIGH) && (bridge->limit <= 0xffffffff)) { |
| bridge->limit = DEVICE_MEM_HIGH; |
| } |
| |
| /* Make certain we are dealing with a good minimum size */ |
| size = resource->size; |
| align = resource->align; |
| if (align < min_align) { |
| align = min_align; |
| } |
| if (resource->flags & IORESOURCE_FIXED) { |
| continue; |
| } |
| if (resource->flags & IORESOURCE_IO) { |
| /* Don't allow potential aliases over the |
| * legacy pci expansion card addresses. |
| * The legacy pci decodes only 10 bits, |
| * uses 100h - 3ffh. Therefor, only 0 - ff |
| * can be used out of each 400h block of io |
| * space. |
| */ |
| if ((base & 0x300) != 0) { |
| base = (base & ~0x3ff) + 0x400; |
| } |
| /* Don't allow allocations in the VGA IO range. |
| * PCI has special cases for that. |
| */ |
| else if ((base >= 0x3b0) && (base <= 0x3df)) { |
| base = 0x3e0; |
| } |
| } |
| if (((round(base, align) + size) -1) <= resource->limit) { |
| /* base must be aligned to size */ |
| base = round(base, align); |
| resource->base = base; |
| resource->flags |= IORESOURCE_ASSIGNED; |
| resource->flags &= ~IORESOURCE_STORED; |
| base += size; |
| |
| printk_spew( |
| "%s %02x * [0x%08Lx - 0x%08Lx] %s\n", |
| dev_path(dev), |
| resource->index, |
| resource->base, |
| resource->base + resource->size - 1, |
| (resource->flags & IORESOURCE_IO)? "io": |
| (resource->flags & IORESOURCE_PREFETCH)? "prefmem": "mem"); |
| } |
| } |
| /* A pci bridge resource does not need to be a power |
| * of two size, but it does have a minimum granularity. |
| * Round the size up to that minimum granularity so we |
| * know not to place something else at an address postitively |
| * decoded by the bridge. |
| */ |
| bridge->size = round(base, bridge->gran) - bridge->base; |
| |
| printk_spew("%s compute_allocate_%s: base: %08lx size: %08lx align: %d gran: %d done\n", |
| dev_path(bus->dev), |
| (bridge->flags & IORESOURCE_IO)? "io": |
| (bridge->flags & IORESOURCE_PREFETCH)? "prefmem" : "mem", |
| base, bridge->size, bridge->align, bridge->gran); |
| |
| |
| } |
| |
| static void allocate_vga_resource(void) |
| { |
| #warning "FIXME modify allocate_vga_resource so it is less pci centric!" |
| #warning "This function knows to much about PCI stuff, it should be just a ietrator/visitor." |
| |
| /* FIXME handle the VGA pallette snooping */ |
| struct device *dev, *vga; |
| struct bus *bus; |
| bus = 0; |
| vga = 0; |
| for(dev = all_devices; dev; dev = dev->next) { |
| if (((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) && |
| ((dev->class >> 8) != PCI_CLASS_DISPLAY_OTHER)) |
| { |
| if (!vga) { |
| printk_debug("Allocating VGA resource %s\n", |
| dev_path(dev)); |
| vga = dev; |
| } |
| if (vga == dev) { |
| /* All legacy VGA cards have MEM & I/O space registers */ |
| dev->command |= PCI_COMMAND_MEMORY | PCI_COMMAND_IO; |
| } else { |
| /* It isn't safe to enable other VGA cards */ |
| dev->command &= ~(PCI_COMMAND_MEMORY | PCI_COMMAND_IO); |
| } |
| } |
| } |
| if (vga) { |
| bus = vga->bus; |
| } |
| /* Now walk up the bridges setting the VGA enable */ |
| while(bus) { |
| bus->bridge_ctrl |= PCI_BRIDGE_CTL_VGA; |
| bus = (bus == bus->dev->bus)? 0 : bus->dev->bus; |
| } |
| } |
| |
| |
| /** Assign the computed resources to the bridges and devices on the bus. |
| * Recurse to any bridges found on this bus first. Then do the devices |
| * on this bus. |
| * |
| * @param bus Pointer to the structure for this bus |
| */ |
| void assign_resources(struct bus *bus) |
| { |
| struct device *curdev; |
| |
| printk_spew("%s assign_resources, bus %d link: %d\n", |
| dev_path(bus->dev), bus->secondary, bus->link); |
| |
| for(curdev = bus->children; curdev; curdev = curdev->sibling) { |
| if (!curdev->enabled || !curdev->resources) { |
| continue; |
| } |
| if (!curdev->ops || !curdev->ops->set_resources) { |
| printk_err("%s missing set_resources\n", |
| dev_path(curdev)); |
| continue; |
| } |
| curdev->ops->set_resources(curdev); |
| } |
| printk_spew("%s assign_resources, bus %d link: %d\n", |
| dev_path(bus->dev), bus->secondary, bus->link); |
| } |
| |
| /** |
| * @brief Enable the resources for a specific device |
| * |
| * @param dev the device whose resources are to be enabled |
| * |
| * Enable resources of the device by calling the device specific |
| * enable_resources() method. |
| * |
| * The parent's resources should be enabled first to avoid having enabling |
| * order problem. This is done by calling the parent's enable_resources() |
| * method and let that method to call it's children's enable_resoruces() via |
| * enable_childrens_resources(). |
| * |
| * Indirect mutual recursion: |
| */ |
| void enable_resources(struct device *dev) |
| { |
| if (!dev->enabled) { |
| return; |
| } |
| if (!dev->ops || !dev->ops->enable_resources) { |
| printk_err("%s missing enable_resources\n", dev_path(dev)); |
| return; |
| } |
| dev->ops->enable_resources(dev); |
| } |
| |
| /** |
| * @brief Determine the existence of dynamic devices and construct dynamic |
| * device tree. |
| * |
| * Start from the root device 'dev_root', scan the buses in the system |
| * recursively, build the dynamic device tree according to the result |
| * of the probe. |
| * |
| * This function has no idea how to scan and probe buses and devices at all. |
| * It depends on the bus/device specific scan_bus() method to do it. The |
| * scan_bus() function also has to create the device structure and attach |
| * it to the device tree. |
| */ |
| void dev_enumerate(void) |
| { |
| struct device *root; |
| unsigned subordinate; |
| printk_info("Enumerating buses...\n"); |
| root = &dev_root; |
| if (!root->ops || !root->ops->scan_bus) { |
| printk_err("dev_root missing scan_bus operation"); |
| return; |
| } |
| subordinate = root->ops->scan_bus(root, 0); |
| printk_info("done\n"); |
| } |
| |
| |
| /** |
| * @brief Configure devices on the devices tree. |
| * |
| * Starting at the root of the dynamic device tree, travel recursively, |
| * and compute resources needed by each device and allocate them. |
| * |
| * I/O resources start at DEVICE_IO_START and grow upward. MEM resources start |
| * at DEVICE_MEM_START and grow downward. |
| * |
| * Since the assignment is hierarchical we set the values into the dev_root |
| * struct. |
| */ |
| void dev_configure(void) |
| { |
| struct resource *io, *mem; |
| struct device *root; |
| |
| printk_info("Allocating resources...\n"); |
| |
| root = &dev_root; |
| if (!root->ops || !root->ops->read_resources) { |
| printk_err("dev_root missing read_resources\n"); |
| return; |
| } |
| if (!root->ops || !root->ops->set_resources) { |
| printk_err("dev_root missing set_resources\n"); |
| return; |
| } |
| root->ops->read_resources(root); |
| |
| /* Get the resources */ |
| io = &root->resource[0]; |
| mem = &root->resource[1]; |
| /* Make certain the io devices are allocated somewhere safe. */ |
| io->base = DEVICE_IO_START; |
| io->flags |= IORESOURCE_ASSIGNED; |
| io->flags &= ~IORESOURCE_STORED; |
| /* Now reallocate the pci resources memory with the |
| * highest addresses I can manage. |
| */ |
| mem->base = resource_max(&root->resource[1]); |
| mem->flags |= IORESOURCE_ASSIGNED; |
| mem->flags &= ~IORESOURCE_STORED; |
| |
| /* Allocate the VGA I/O resource.. */ |
| allocate_vga_resource(); |
| |
| /* Store the computed resource allocations into device registers ... */ |
| root->ops->set_resources(root); |
| |
| #if 0 |
| mem->flags |= IORESOURCE_STORED; |
| report_resource_stored(root, mem, ""); |
| #endif |
| |
| printk_info("done.\n"); |
| } |
| |
| /** |
| * @brief Enable devices on the device tree. |
| * |
| * Starting at the root, walk the tree and enable all devices/bridges by |
| * calling the device's enable_resources() method. |
| */ |
| void dev_enable(void) |
| { |
| printk_info("Enabling resourcess...\n"); |
| |
| /* now enable everything. */ |
| enable_resources(&dev_root); |
| |
| printk_info("done.\n"); |
| } |
| |
| /** |
| * @brief Initialize all devices in the global device list. |
| * |
| * Starting at the first device on the global device link list, |
| * walk the list and call a driver to do device specific setup. |
| */ |
| void dev_initialize(void) |
| { |
| struct device *dev; |
| |
| printk_info("Initializing devices...\n"); |
| for(dev = all_devices; dev; dev = dev->next) { |
| if (dev->enabled && !dev->initialized && |
| dev->ops && dev->ops->init) |
| { |
| printk_debug("%s init\n", dev_path(dev)); |
| dev->initialized = 1; |
| dev->ops->init(dev); |
| } |
| } |
| printk_info("Devices initialized\n"); |
| } |