diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/macintosh/macio_asic.c | 792 |
1 files changed, 792 insertions, 0 deletions
diff --git a/drivers/macintosh/macio_asic.c b/drivers/macintosh/macio_asic.c new file mode 100644 index 000000000..3bc1f374e --- /dev/null +++ b/drivers/macintosh/macio_asic.c @@ -0,0 +1,792 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Bus & driver management routines for devices within + * a MacIO ASIC. Interface to new driver model mostly + * stolen from the PCI version. + * + * Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org) + * + * TODO: + * + * - Don't probe below media bay by default, but instead provide + * some hooks for media bay to dynamically add/remove it's own + * sub-devices. + */ + +#include <linux/string.h> +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/pci_ids.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> + +#include <asm/machdep.h> +#include <asm/macio.h> +#include <asm/pmac_feature.h> + +#undef DEBUG + +#define MAX_NODE_NAME_SIZE (20 - 12) + +static struct macio_chip *macio_on_hold; + +static int macio_bus_match(struct device *dev, struct device_driver *drv) +{ + const struct of_device_id * matches = drv->of_match_table; + + if (!matches) + return 0; + + return of_match_device(matches, dev) != NULL; +} + +struct macio_dev *macio_dev_get(struct macio_dev *dev) +{ + struct device *tmp; + + if (!dev) + return NULL; + tmp = get_device(&dev->ofdev.dev); + if (tmp) + return to_macio_device(tmp); + else + return NULL; +} + +void macio_dev_put(struct macio_dev *dev) +{ + if (dev) + put_device(&dev->ofdev.dev); +} + + +static int macio_device_probe(struct device *dev) +{ + int error = -ENODEV; + struct macio_driver *drv; + struct macio_dev *macio_dev; + const struct of_device_id *match; + + drv = to_macio_driver(dev->driver); + macio_dev = to_macio_device(dev); + + if (!drv->probe) + return error; + + macio_dev_get(macio_dev); + + match = of_match_device(drv->driver.of_match_table, dev); + if (match) + error = drv->probe(macio_dev, match); + if (error) + macio_dev_put(macio_dev); + + return error; +} + +static void macio_device_remove(struct device *dev) +{ + struct macio_dev * macio_dev = to_macio_device(dev); + struct macio_driver * drv = to_macio_driver(dev->driver); + + if (dev->driver && drv->remove) + drv->remove(macio_dev); + macio_dev_put(macio_dev); +} + +static void macio_device_shutdown(struct device *dev) +{ + struct macio_dev * macio_dev = to_macio_device(dev); + struct macio_driver * drv = to_macio_driver(dev->driver); + + if (dev->driver && drv->shutdown) + drv->shutdown(macio_dev); +} + +static int macio_device_suspend(struct device *dev, pm_message_t state) +{ + struct macio_dev * macio_dev = to_macio_device(dev); + struct macio_driver * drv = to_macio_driver(dev->driver); + + if (dev->driver && drv->suspend) + return drv->suspend(macio_dev, state); + return 0; +} + +static int macio_device_resume(struct device * dev) +{ + struct macio_dev * macio_dev = to_macio_device(dev); + struct macio_driver * drv = to_macio_driver(dev->driver); + + if (dev->driver && drv->resume) + return drv->resume(macio_dev); + return 0; +} + +extern const struct attribute_group *macio_dev_groups[]; + +struct bus_type macio_bus_type = { + .name = "macio", + .match = macio_bus_match, + .uevent = of_device_uevent_modalias, + .probe = macio_device_probe, + .remove = macio_device_remove, + .shutdown = macio_device_shutdown, + .suspend = macio_device_suspend, + .resume = macio_device_resume, + .dev_groups = macio_dev_groups, +}; + +static int __init macio_bus_driver_init(void) +{ + return bus_register(&macio_bus_type); +} + +postcore_initcall(macio_bus_driver_init); + + +/** + * macio_release_dev - free a macio device structure when all users of it are + * finished. + * @dev: device that's been disconnected + * + * Will be called only by the device core when all users of this macio device + * are done. This currently means never as we don't hot remove any macio + * device yet, though that will happen with mediabay based devices in a later + * implementation. + */ +static void macio_release_dev(struct device *dev) +{ + struct macio_dev *mdev; + + mdev = to_macio_device(dev); + kfree(mdev); +} + +/** + * macio_resource_quirks - tweak or skip some resources for a device + * @np: pointer to the device node + * @res: resulting resource + * @index: index of resource in node + * + * If this routine returns non-null, then the resource is completely + * skipped. + */ +static int macio_resource_quirks(struct device_node *np, struct resource *res, + int index) +{ + /* Only quirks for memory resources for now */ + if ((res->flags & IORESOURCE_MEM) == 0) + return 0; + + /* Grand Central has too large resource 0 on some machines */ + if (index == 0 && of_node_name_eq(np, "gc")) + res->end = res->start + 0x1ffff; + + /* Airport has bogus resource 2 */ + if (index >= 2 && of_node_name_eq(np, "radio")) + return 1; + +#ifndef CONFIG_PPC64 + /* DBDMAs may have bogus sizes */ + if ((res->start & 0x0001f000) == 0x00008000) + res->end = res->start + 0xff; +#endif /* CONFIG_PPC64 */ + + /* ESCC parent eats child resources. We could have added a + * level of hierarchy, but I don't really feel the need + * for it + */ + if (of_node_name_eq(np, "escc")) + return 1; + + /* ESCC has bogus resources >= 3 */ + if (index >= 3 && (of_node_name_eq(np, "ch-a") || + of_node_name_eq(np, "ch-b"))) + return 1; + + /* Media bay has too many resources, keep only first one */ + if (index > 0 && of_node_name_eq(np, "media-bay")) + return 1; + + /* Some older IDE resources have bogus sizes */ + if (of_node_name_eq(np, "IDE") || of_node_name_eq(np, "ATA") || + of_node_is_type(np, "ide") || of_node_is_type(np, "ata")) { + if (index == 0 && (res->end - res->start) > 0xfff) + res->end = res->start + 0xfff; + if (index == 1 && (res->end - res->start) > 0xff) + res->end = res->start + 0xff; + } + return 0; +} + +static void macio_create_fixup_irq(struct macio_dev *dev, int index, + unsigned int line) +{ + unsigned int irq; + + irq = irq_create_mapping(NULL, line); + if (!irq) { + dev->interrupt[index].start = irq; + dev->interrupt[index].flags = IORESOURCE_IRQ; + dev->interrupt[index].name = dev_name(&dev->ofdev.dev); + } + if (dev->n_interrupts <= index) + dev->n_interrupts = index + 1; +} + +static void macio_add_missing_resources(struct macio_dev *dev) +{ + struct device_node *np = dev->ofdev.dev.of_node; + unsigned int irq_base; + + /* Gatwick has some missing interrupts on child nodes */ + if (dev->bus->chip->type != macio_gatwick) + return; + + /* irq_base is always 64 on gatwick. I have no cleaner way to get + * that value from here at this point + */ + irq_base = 64; + + /* Fix SCC */ + if (of_node_name_eq(np, "ch-a")) { + macio_create_fixup_irq(dev, 0, 15 + irq_base); + macio_create_fixup_irq(dev, 1, 4 + irq_base); + macio_create_fixup_irq(dev, 2, 5 + irq_base); + printk(KERN_INFO "macio: fixed SCC irqs on gatwick\n"); + } + + /* Fix media-bay */ + if (of_node_name_eq(np, "media-bay")) { + macio_create_fixup_irq(dev, 0, 29 + irq_base); + printk(KERN_INFO "macio: fixed media-bay irq on gatwick\n"); + } + + /* Fix left media bay childs */ + if (dev->media_bay != NULL && of_node_name_eq(np, "floppy")) { + macio_create_fixup_irq(dev, 0, 19 + irq_base); + macio_create_fixup_irq(dev, 1, 1 + irq_base); + printk(KERN_INFO "macio: fixed left floppy irqs\n"); + } + if (dev->media_bay != NULL && of_node_name_eq(np, "ata4")) { + macio_create_fixup_irq(dev, 0, 14 + irq_base); + macio_create_fixup_irq(dev, 0, 3 + irq_base); + printk(KERN_INFO "macio: fixed left ide irqs\n"); + } +} + +static void macio_setup_interrupts(struct macio_dev *dev) +{ + struct device_node *np = dev->ofdev.dev.of_node; + unsigned int irq; + int i = 0, j = 0; + + for (;;) { + struct resource *res; + + if (j >= MACIO_DEV_COUNT_IRQS) + break; + res = &dev->interrupt[j]; + irq = irq_of_parse_and_map(np, i++); + if (!irq) + break; + res->start = irq; + res->flags = IORESOURCE_IRQ; + res->name = dev_name(&dev->ofdev.dev); + if (macio_resource_quirks(np, res, i - 1)) { + memset(res, 0, sizeof(struct resource)); + continue; + } else + j++; + } + dev->n_interrupts = j; +} + +static void macio_setup_resources(struct macio_dev *dev, + struct resource *parent_res) +{ + struct device_node *np = dev->ofdev.dev.of_node; + struct resource r; + int index; + + for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) { + struct resource *res; + if (index >= MACIO_DEV_COUNT_RESOURCES) + break; + res = &dev->resource[index]; + *res = r; + res->name = dev_name(&dev->ofdev.dev); + + if (macio_resource_quirks(np, res, index)) { + memset(res, 0, sizeof(struct resource)); + continue; + } + /* Currently, we consider failure as harmless, this may + * change in the future, once I've found all the device + * tree bugs in older machines & worked around them + */ + if (insert_resource(parent_res, res)) { + printk(KERN_WARNING "Can't request resource " + "%d for MacIO device %s\n", + index, dev_name(&dev->ofdev.dev)); + } + } + dev->n_resources = index; +} + +/** + * macio_add_one_device - Add one device from OF node to the device tree + * @chip: pointer to the macio_chip holding the device + * @np: pointer to the device node in the OF tree + * @in_bay: set to 1 if device is part of a media-bay + * + * When media-bay is changed to hotswap drivers, this function will + * be exposed to the bay driver some way... + */ +static struct macio_dev * macio_add_one_device(struct macio_chip *chip, + struct device *parent, + struct device_node *np, + struct macio_dev *in_bay, + struct resource *parent_res) +{ + char name[MAX_NODE_NAME_SIZE + 1]; + struct macio_dev *dev; + const u32 *reg; + + if (np == NULL) + return NULL; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return NULL; + + dev->bus = &chip->lbus; + dev->media_bay = in_bay; + dev->ofdev.dev.of_node = np; + dev->ofdev.archdata.dma_mask = 0xffffffffUL; + dev->ofdev.dev.dma_mask = &dev->ofdev.archdata.dma_mask; + dev->ofdev.dev.coherent_dma_mask = dev->ofdev.archdata.dma_mask; + dev->ofdev.dev.parent = parent; + dev->ofdev.dev.bus = &macio_bus_type; + dev->ofdev.dev.release = macio_release_dev; + dev->ofdev.dev.dma_parms = &dev->dma_parms; + + /* Standard DMA paremeters */ + dma_set_max_seg_size(&dev->ofdev.dev, 65536); + dma_set_seg_boundary(&dev->ofdev.dev, 0xffffffff); + +#if defined(CONFIG_PCI) && defined(CONFIG_DMA_OPS) + /* Set the DMA ops to the ones from the PCI device, this could be + * fishy if we didn't know that on PowerMac it's always direct ops + * or iommu ops that will work fine + * + * To get all the fields, copy all archdata + */ + dev->ofdev.dev.archdata = chip->lbus.pdev->dev.archdata; + dev->ofdev.dev.dma_ops = chip->lbus.pdev->dev.dma_ops; +#endif /* CONFIG_PCI && CONFIG_DMA_OPS */ + +#ifdef DEBUG + printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n", + dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj); +#endif + + /* MacIO itself has a different reg, we use it's PCI base */ + snprintf(name, sizeof(name), "%pOFn", np); + if (np == chip->of_node) { + dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s", + chip->lbus.index, +#ifdef CONFIG_PCI + (unsigned int)pci_resource_start(chip->lbus.pdev, 0), +#else + 0, /* NuBus may want to do something better here */ +#endif + MAX_NODE_NAME_SIZE, name); + } else { + reg = of_get_property(np, "reg", NULL); + dev_set_name(&dev->ofdev.dev, "%1d.%08x:%.*s", + chip->lbus.index, + reg ? *reg : 0, MAX_NODE_NAME_SIZE, name); + } + + /* Setup interrupts & resources */ + macio_setup_interrupts(dev); + macio_setup_resources(dev, parent_res); + macio_add_missing_resources(dev); + + /* Register with core */ + if (of_device_register(&dev->ofdev) != 0) { + printk(KERN_DEBUG"macio: device registration error for %s!\n", + dev_name(&dev->ofdev.dev)); + put_device(&dev->ofdev.dev); + return NULL; + } + + return dev; +} + +static int macio_skip_device(struct device_node *np) +{ + return of_node_name_prefix(np, "battery") || + of_node_name_prefix(np, "escc-legacy"); +} + +/** + * macio_pci_add_devices - Adds sub-devices of mac-io to the device tree + * @chip: pointer to the macio_chip holding the devices + * + * This function will do the job of extracting devices from the + * Open Firmware device tree, build macio_dev structures and add + * them to the Linux device tree. + * + * For now, childs of media-bay are added now as well. This will + * change rsn though. + */ +static void macio_pci_add_devices(struct macio_chip *chip) +{ + struct device_node *np, *pnode; + struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL; + struct device *parent = NULL; + struct resource *root_res = &iomem_resource; + + /* Add a node for the macio bus itself */ +#ifdef CONFIG_PCI + if (chip->lbus.pdev) { + parent = &chip->lbus.pdev->dev; + root_res = &chip->lbus.pdev->resource[0]; + } +#endif + pnode = of_node_get(chip->of_node); + if (pnode == NULL) + return; + + /* Add macio itself to hierarchy */ + rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res); + if (rdev == NULL) + return; + root_res = &rdev->resource[0]; + + /* First scan 1st level */ + for_each_child_of_node(pnode, np) { + if (macio_skip_device(np)) + continue; + of_node_get(np); + mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL, + root_res); + if (mdev == NULL) + of_node_put(np); + else if (of_node_name_prefix(np, "media-bay")) + mbdev = mdev; + else if (of_node_name_prefix(np, "escc")) + sdev = mdev; + } + + /* Add media bay devices if any */ + if (mbdev) { + pnode = mbdev->ofdev.dev.of_node; + for_each_child_of_node(pnode, np) { + if (macio_skip_device(np)) + continue; + of_node_get(np); + if (macio_add_one_device(chip, &mbdev->ofdev.dev, np, + mbdev, root_res) == NULL) + of_node_put(np); + } + } + + /* Add serial ports if any */ + if (sdev) { + pnode = sdev->ofdev.dev.of_node; + for_each_child_of_node(pnode, np) { + if (macio_skip_device(np)) + continue; + of_node_get(np); + if (macio_add_one_device(chip, &sdev->ofdev.dev, np, + NULL, root_res) == NULL) + of_node_put(np); + } + } +} + + +/** + * macio_register_driver - Registers a new MacIO device driver + * @drv: pointer to the driver definition structure + */ +int macio_register_driver(struct macio_driver *drv) +{ + /* initialize common driver fields */ + drv->driver.bus = &macio_bus_type; + + /* register with core */ + return driver_register(&drv->driver); +} + +/** + * macio_unregister_driver - Unregisters a new MacIO device driver + * @drv: pointer to the driver definition structure + */ +void macio_unregister_driver(struct macio_driver *drv) +{ + driver_unregister(&drv->driver); +} + +/* Managed MacIO resources */ +struct macio_devres { + u32 res_mask; +}; + +static void maciom_release(struct device *gendev, void *res) +{ + struct macio_dev *dev = to_macio_device(gendev); + struct macio_devres *dr = res; + int i, max; + + max = min(dev->n_resources, 32); + for (i = 0; i < max; i++) { + if (dr->res_mask & (1 << i)) + macio_release_resource(dev, i); + } +} + +int macio_enable_devres(struct macio_dev *dev) +{ + struct macio_devres *dr; + + dr = devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL); + if (!dr) { + dr = devres_alloc(maciom_release, sizeof(*dr), GFP_KERNEL); + if (!dr) + return -ENOMEM; + } + return devres_get(&dev->ofdev.dev, dr, NULL, NULL) != NULL; +} + +static struct macio_devres * find_macio_dr(struct macio_dev *dev) +{ + return devres_find(&dev->ofdev.dev, maciom_release, NULL, NULL); +} + +/** + * macio_request_resource - Request an MMIO resource + * @dev: pointer to the device holding the resource + * @resource_no: resource number to request + * @name: resource name + * + * Mark memory region number @resource_no associated with MacIO + * device @dev as being reserved by owner @name. Do not access + * any address inside the memory regions unless this call returns + * successfully. + * + * Returns 0 on success, or %EBUSY on error. A warning + * message is also printed on failure. + */ +int macio_request_resource(struct macio_dev *dev, int resource_no, + const char *name) +{ + struct macio_devres *dr = find_macio_dr(dev); + + if (macio_resource_len(dev, resource_no) == 0) + return 0; + + if (!request_mem_region(macio_resource_start(dev, resource_no), + macio_resource_len(dev, resource_no), + name)) + goto err_out; + + if (dr && resource_no < 32) + dr->res_mask |= 1 << resource_no; + + return 0; + +err_out: + printk (KERN_WARNING "MacIO: Unable to reserve resource #%d:%lx@%lx" + " for device %s\n", + resource_no, + macio_resource_len(dev, resource_no), + macio_resource_start(dev, resource_no), + dev_name(&dev->ofdev.dev)); + return -EBUSY; +} + +/** + * macio_release_resource - Release an MMIO resource + * @dev: pointer to the device holding the resource + * @resource_no: resource number to release + */ +void macio_release_resource(struct macio_dev *dev, int resource_no) +{ + struct macio_devres *dr = find_macio_dr(dev); + + if (macio_resource_len(dev, resource_no) == 0) + return; + release_mem_region(macio_resource_start(dev, resource_no), + macio_resource_len(dev, resource_no)); + if (dr && resource_no < 32) + dr->res_mask &= ~(1 << resource_no); +} + +/** + * macio_request_resources - Reserve all memory resources + * @dev: MacIO device whose resources are to be reserved + * @name: Name to be associated with resource. + * + * Mark all memory regions associated with MacIO device @dev as + * being reserved by owner @name. Do not access any address inside + * the memory regions unless this call returns successfully. + * + * Returns 0 on success, or %EBUSY on error. A warning + * message is also printed on failure. + */ +int macio_request_resources(struct macio_dev *dev, const char *name) +{ + int i; + + for (i = 0; i < dev->n_resources; i++) + if (macio_request_resource(dev, i, name)) + goto err_out; + return 0; + +err_out: + while(--i >= 0) + macio_release_resource(dev, i); + + return -EBUSY; +} + +/** + * macio_release_resources - Release reserved memory resources + * @dev: MacIO device whose resources were previously reserved + */ + +void macio_release_resources(struct macio_dev *dev) +{ + int i; + + for (i = 0; i < dev->n_resources; i++) + macio_release_resource(dev, i); +} + + +#ifdef CONFIG_PCI + +static int macio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) +{ + struct device_node* np; + struct macio_chip* chip; + + if (ent->vendor != PCI_VENDOR_ID_APPLE) + return -ENODEV; + + /* Note regarding refcounting: We assume pci_device_to_OF_node() is + * ported to new OF APIs and returns a node with refcount incremented. + */ + np = pci_device_to_OF_node(pdev); + if (np == NULL) + return -ENODEV; + + /* The above assumption is wrong !!! + * fix that here for now until I fix the arch code + */ + of_node_get(np); + + /* We also assume that pmac_feature will have done a get() on nodes + * stored in the macio chips array + */ + chip = macio_find(np, macio_unknown); + of_node_put(np); + if (chip == NULL) + return -ENODEV; + + /* XXX Need locking ??? */ + if (chip->lbus.pdev == NULL) { + chip->lbus.pdev = pdev; + chip->lbus.chip = chip; + pci_set_drvdata(pdev, &chip->lbus); + pci_set_master(pdev); + } + + printk(KERN_INFO "MacIO PCI driver attached to %s chipset\n", + chip->name); + + /* + * HACK ALERT: The WallStreet PowerBook and some OHare based machines + * have 2 macio ASICs. I must probe the "main" one first or IDE + * ordering will be incorrect. So I put on "hold" the second one since + * it seem to appear first on PCI + */ + if (chip->type == macio_gatwick || chip->type == macio_ohareII) + if (macio_chips[0].lbus.pdev == NULL) { + macio_on_hold = chip; + return 0; + } + + macio_pci_add_devices(chip); + if (macio_on_hold && macio_chips[0].lbus.pdev != NULL) { + macio_pci_add_devices(macio_on_hold); + macio_on_hold = NULL; + } + + return 0; +} + +static void macio_pci_remove(struct pci_dev* pdev) +{ + panic("removing of macio-asic not supported !\n"); +} + +/* + * MacIO is matched against any Apple ID, it's probe() function + * will then decide wether it applies or not + */ +static const struct pci_device_id pci_ids[] = { { + .vendor = PCI_VENDOR_ID_APPLE, + .device = PCI_ANY_ID, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + + }, { /* end: all zeroes */ } +}; +MODULE_DEVICE_TABLE (pci, pci_ids); + +/* pci driver glue; this is a "new style" PCI driver module */ +static struct pci_driver macio_pci_driver = { + .name = "macio", + .id_table = pci_ids, + + .probe = macio_pci_probe, + .remove = macio_pci_remove, +}; + +#endif /* CONFIG_PCI */ + +static int __init macio_module_init (void) +{ +#ifdef CONFIG_PCI + int rc; + + rc = pci_register_driver(&macio_pci_driver); + if (rc) + return rc; +#endif /* CONFIG_PCI */ + return 0; +} + +module_init(macio_module_init); + +EXPORT_SYMBOL(macio_register_driver); +EXPORT_SYMBOL(macio_unregister_driver); +EXPORT_SYMBOL(macio_dev_get); +EXPORT_SYMBOL(macio_dev_put); +EXPORT_SYMBOL(macio_request_resource); +EXPORT_SYMBOL(macio_release_resource); +EXPORT_SYMBOL(macio_request_resources); +EXPORT_SYMBOL(macio_release_resources); +EXPORT_SYMBOL(macio_enable_devres); + |