/*
* 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)
*
* 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.
*
* 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_address.h>
#include <linux/of_irq.h>
#include <asm/machdep.h>
#include <asm/macio.h>
#include <asm/pmac_feature.h>
#include <asm/prom.h>
#include <asm/pci-bridge.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 int 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);
return 0;
}
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 struct device_attribute macio_dev_attrs[];
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_attrs = macio_dev_attrs,
};
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 && !strcmp(np->name, "gc"))
res->end = res->start + 0x1ffff;
/* Airport has bogus resource 2 */
if (index >= 2 && !strcmp(np->name, "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 (!strcmp(np->name, "escc"))
return 1;
/* ESCC has bogus resources >= 3 */
if (index >= 3 && !(strcmp(np->name, "ch-a") &&
strcmp(np->name, "ch-b")))
return 1;
/* Media bay has too many resources, keep only first one */
if (index > 0 && !strcmp(np->name, "media-bay"))
return 1;
/* Some older IDE resources have bogus sizes */
if (!(strcmp(np->name, "IDE") && strcmp(np->name, "ATA") &&
strcmp(np->type, "ide") && strcmp(np->type, "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 != NO_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 (strcmp(np->name, "ch-a") == 0) {
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 (strcmp(np->name, "media-bay") == 0) {
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 && strcmp(np->name, "floppy") == 0) {
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 && strcasecmp(np->name, "ata4") == 0) {
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 == NO_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)
{
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.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);
#ifdef CONFIG_PCI
/* 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;
#endif /* CONFIG_PCI */
#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 */
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, np->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, np->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));
kfree(dev);
return NULL;
}
return dev;
}
static int macio_skip_device(struct device_node *np)
{
if (strncmp(np->name, "battery", 7) == 0)
return 1;
if (strncmp(np->name, "escc-legacy", 11) == 0)
return 1;
return 0;
}
/**
* 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 (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
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 (strncmp(np->name, "media-bay", 9) == 0)
mbdev = mdev;
else if (strncmp(np->name, "escc", 4) == 0)
sdev = mdev;
}
/* Add media bay devices if any */
if (mbdev) {
pnode = mbdev->ofdev.dev.of_node;
for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
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 (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
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 = (char *) "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);