android_kernel_xiaomi_sm8350/drivers/macintosh/macio_asic.c
Jeff Mahoney 184f6eb8c4 [PATCH] openfirmware: implement hotplug for macio devices
This adds the hotplug routine for generating hotplug events when devices
are seen on the macio bus.  It uses the attributed created by the sysfs
nodes to generate the hotplug environment vars for userspace.

Since the characters allowed inside the 'compatible' field are NUL
terminated, they are exported as individual OF_COMPATIBLE_# variables,
with OF_COMPATIBLE_N maintaining a count of how many there are.

In order for hotplug to work with macio devices, patches to
module-init-tools and hotplug must be applied.  Those patches are
available at:

ftp://ftp.suse.com/pub/people/jeffm/linux/macio-hotplug/

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-07-06 12:55:20 -07:00

711 lines
19 KiB
C

/*
* Bus & driver management routines for devices within
* a MacIO ASIC. Interface to new driver model mostly
* stolen from the PCI 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/config.h>
#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 <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 (BUS_ID_SIZE - 12)
static struct macio_chip *macio_on_hold;
static int macio_bus_match(struct device *dev, struct device_driver *drv)
{
struct macio_dev * macio_dev = to_macio_device(dev);
struct macio_driver * macio_drv = to_macio_driver(drv);
const struct of_device_id * matches = macio_drv->match_table;
if (!matches)
return 0;
return of_match_device(matches, &macio_dev->ofdev) != 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->match_table, &macio_dev->ofdev);
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;
}
static int macio_hotplug (struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
struct macio_dev * macio_dev;
struct of_device * of;
char *scratch, *compat;
int i = 0;
int length = 0;
int cplen, seen = 0;
if (!dev)
return -ENODEV;
macio_dev = to_macio_device(dev);
if (!macio_dev)
return -ENODEV;
of = &macio_dev->ofdev;
scratch = buffer;
/* stuff we want to pass to /sbin/hotplug */
envp[i++] = scratch;
length += scnprintf (scratch, buffer_size - length, "OF_NAME=%s",
of->node->name);
if ((buffer_size - length <= 0) || (i >= num_envp))
return -ENOMEM;
++length;
scratch += length;
envp[i++] = scratch;
length += scnprintf (scratch, buffer_size - length, "OF_TYPE=%s",
of->node->type);
if ((buffer_size - length <= 0) || (i >= num_envp))
return -ENOMEM;
++length;
scratch += length;
/* Since the compatible field can contain pretty much anything
* it's not really legal to split it out with commas. We split it
* up using a number of environment variables instead. */
compat = (char *) get_property(of->node, "compatible", &cplen);
while (compat && cplen > 0) {
int l;
envp[i++] = scratch;
length += scnprintf (scratch, buffer_size - length,
"OF_COMPATIBLE_%d=%s", seen, compat);
if ((buffer_size - length <= 0) || (i >= num_envp))
return -ENOMEM;
length++;
scratch += length;
l = strlen (compat) + 1;
compat += l;
cplen -= l;
seen++;
}
envp[i++] = scratch;
length += scnprintf (scratch, buffer_size - length,
"OF_COMPATIBLE_N=%d", seen);
if ((buffer_size - length <= 0) || (i >= num_envp))
return -ENOMEM;
++length;
scratch += length;
envp[i] = NULL;
return 0;
}
extern struct device_attribute macio_dev_attrs[];
struct bus_type macio_bus_type = {
.name = "macio",
.match = macio_bus_match,
.hotplug = macio_hotplug,
.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)
{
if (res->flags & IORESOURCE_MEM) {
/* Grand Central has too large resource 0 on some machines */
if (index == 0 && !strcmp(np->name, "gc")) {
np->addrs[0].size = 0x20000;
res->end = res->start + 0x1ffff;
}
/* Airport has bogus resource 2 */
if (index >= 2 && !strcmp(np->name, "radio"))
return 1;
/* DBDMAs may have bogus sizes */
if ((res->start & 0x0001f000) == 0x00008000) {
np->addrs[index].size = 0x100;
res->end = res->start + 0xff;
}
/* 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 && np->addrs[0].size > 0x1000) {
np->addrs[0].size = 0x1000;
res->end = res->start + 0xfff;
}
if (index == 1 && np->addrs[1].size > 0x100) {
np->addrs[1].size = 0x100;
res->end = res->start + 0xff;
}
}
}
return 0;
}
/**
* 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;
int i, j;
u32 *reg;
if (np == NULL)
return NULL;
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return NULL;
memset(dev, 0, sizeof(*dev));
dev->bus = &chip->lbus;
dev->media_bay = in_bay;
dev->ofdev.node = np;
dev->ofdev.dma_mask = 0xffffffffUL;
dev->ofdev.dev.dma_mask = &dev->ofdev.dma_mask;
dev->ofdev.dev.parent = parent;
dev->ofdev.dev.bus = &macio_bus_type;
dev->ofdev.dev.release = macio_release_dev;
#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) {
sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s", chip->lbus.index,
#ifdef CONFIG_PCI
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 = (u32 *)get_property(np, "reg", NULL);
sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s", chip->lbus.index,
reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
}
/* For now, we use pre-parsed entries in the device-tree for
* interrupt routing and addresses, but we should change that
* to dynamically parsed entries and so get rid of most of the
* clutter in struct device_node
*/
for (i = j = 0; i < np->n_intrs; i++) {
struct resource *res = &dev->interrupt[j];
if (j >= MACIO_DEV_COUNT_IRQS)
break;
res->start = np->intrs[i].line;
res->flags = IORESOURCE_IO;
if (np->intrs[j].sense)
res->flags |= IORESOURCE_IRQ_LOWLEVEL;
else
res->flags |= IORESOURCE_IRQ_HIGHEDGE;
res->name = dev->ofdev.dev.bus_id;
if (macio_resource_quirks(np, res, i))
memset(res, 0, sizeof(struct resource));
else
j++;
}
dev->n_interrupts = j;
for (i = j = 0; i < np->n_addrs; i++) {
struct resource *res = &dev->resource[j];
if (j >= MACIO_DEV_COUNT_RESOURCES)
break;
res->start = np->addrs[i].address;
res->end = np->addrs[i].address + np->addrs[i].size - 1;
res->flags = IORESOURCE_MEM;
res->name = dev->ofdev.dev.bus_id;
if (macio_resource_quirks(np, res, i))
memset(res, 0, sizeof(struct resource));
else {
j++;
/* 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", i, dev->ofdev.dev.bus_id);
}
}
dev->n_resources = j;
if (of_device_register(&dev->ofdev) != 0) {
printk(KERN_DEBUG"macio: device registration error for %s!\n",
dev->ofdev.dev.bus_id);
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)) {
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)
for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np)) != NULL;)
if (!macio_skip_device(np)) {
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) {
for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np)) != NULL;)
if (!macio_skip_device(np)) {
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)
{
int count = 0;
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &macio_bus_type;
drv->driver.probe = macio_device_probe;
drv->driver.remove = macio_device_remove;
drv->driver.shutdown = macio_device_shutdown;
/* register with core */
count = driver_register(&drv->driver);
return count ? count : 1;
}
/**
* 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);
}
/**
* 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)
{
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;
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->ofdev.dev.bus_id);
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)
{
if (macio_resource_len(dev, resource_no) == 0)
return;
release_mem_region(macio_resource_start(dev, resource_no),
macio_resource_len(dev, 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 __devinit 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. This isn't
* the case today, but on the other hand ppc32 doesn't do refcounting. This
* will have to be fixed when going to ppc64. --BenH.
*/
np = pci_device_to_OF_node(pdev);
if (np == NULL)
return -ENODEV;
/* This assumption is wrong, fix that here for now until I fix the arch */
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 __devexit 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 __devinitdata 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);