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-rw-r--r--arch/ppc/syslib/ocp.c482
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diff --git a/arch/ppc/syslib/ocp.c b/arch/ppc/syslib/ocp.c
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-/*
- * ocp.c
- *
- * (c) Benjamin Herrenschmidt (benh@kernel.crashing.org)
- * Mipsys - France
- *
- * Derived from work (c) Armin Kuster akuster@pacbell.net
- *
- * Additional support and port to 2.6 LDM/sysfs by
- * Matt Porter <mporter@kernel.crashing.org>
- * Copyright 2004 MontaVista Software, Inc.
- *
- * 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.
- *
- * OCP (On Chip Peripheral) is a software emulated "bus" with a
- * pseudo discovery method for dumb peripherals. Usually these type
- * of peripherals are found on embedded SoC (System On a Chip)
- * processors or highly integrated system controllers that have
- * a host bridge and many peripherals. Common examples where
- * this is already used include the PPC4xx, MPC52xx,
- * and MV64xxx parts.
- *
- * This subsystem creates a standard OCP bus type within the
- * device model. The devices on the OCP bus are seeded by an
- * an initial OCP device array created by the arch-specific
- * Device entries can be added/removed/modified through OCP
- * helper functions to accommodate system and board-specific
- * parameters commonly found in embedded systems. OCP also
- * provides a standard method for devices to describe extended
- * attributes about themselves to the system. A standard access
- * method allows OCP drivers to obtain the information, both
- * SoC-specific and system/board-specific, needed for operation.
- */
-
-#include <linux/module.h>
-#include <linux/list.h>
-#include <linux/miscdevice.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/pm.h>
-#include <linux/bootmem.h>
-#include <linux/device.h>
-#include <linux/rwsem.h>
-
-#include <asm/io.h>
-#include <asm/ocp.h>
-#include <asm/errno.h>
-
-//#define DBG(x) printk x
-#define DBG(x)
-
-extern int mem_init_done;
-
-extern struct ocp_def core_ocp[]; /* Static list of devices, provided by
- CPU core */
-
-LIST_HEAD(ocp_devices); /* List of all OCP devices */
-DECLARE_RWSEM(ocp_devices_sem); /* Global semaphores for those lists */
-
-static int ocp_inited;
-
-/* Sysfs support */
-#define OCP_DEF_ATTR(field, format_string) \
-static ssize_t \
-show_##field(struct device *dev, struct device_attribute *attr, char *buf) \
-{ \
- struct ocp_device *odev = to_ocp_dev(dev); \
- \
- return sprintf(buf, format_string, odev->def->field); \
-} \
-static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
-
-OCP_DEF_ATTR(vendor, "0x%04x\n");
-OCP_DEF_ATTR(function, "0x%04x\n");
-OCP_DEF_ATTR(index, "0x%04x\n");
-#ifdef CONFIG_PTE_64BIT
-OCP_DEF_ATTR(paddr, "0x%016Lx\n");
-#else
-OCP_DEF_ATTR(paddr, "0x%08lx\n");
-#endif
-OCP_DEF_ATTR(irq, "%d\n");
-OCP_DEF_ATTR(pm, "%lu\n");
-
-void ocp_create_sysfs_dev_files(struct ocp_device *odev)
-{
- struct device *dev = &odev->dev;
-
- /* Current OCP device def attributes */
- device_create_file(dev, &dev_attr_vendor);
- device_create_file(dev, &dev_attr_function);
- device_create_file(dev, &dev_attr_index);
- device_create_file(dev, &dev_attr_paddr);
- device_create_file(dev, &dev_attr_irq);
- device_create_file(dev, &dev_attr_pm);
- /* Current OCP device additions attributes */
- if (odev->def->additions && odev->def->show)
- odev->def->show(dev);
-}
-
-/**
- * ocp_device_match - Match one driver to one device
- * @drv: driver to match
- * @dev: device to match
- *
- * This function returns 0 if the driver and device don't match
- */
-static int
-ocp_device_match(struct device *dev, struct device_driver *drv)
-{
- struct ocp_device *ocp_dev = to_ocp_dev(dev);
- struct ocp_driver *ocp_drv = to_ocp_drv(drv);
- const struct ocp_device_id *ids = ocp_drv->id_table;
-
- if (!ids)
- return 0;
-
- while (ids->vendor || ids->function) {
- if ((ids->vendor == OCP_ANY_ID
- || ids->vendor == ocp_dev->def->vendor)
- && (ids->function == OCP_ANY_ID
- || ids->function == ocp_dev->def->function))
- return 1;
- ids++;
- }
- return 0;
-}
-
-static int
-ocp_device_probe(struct device *dev)
-{
- int error = 0;
- struct ocp_driver *drv;
- struct ocp_device *ocp_dev;
-
- drv = to_ocp_drv(dev->driver);
- ocp_dev = to_ocp_dev(dev);
-
- if (drv->probe) {
- error = drv->probe(ocp_dev);
- if (error >= 0) {
- ocp_dev->driver = drv;
- error = 0;
- }
- }
- return error;
-}
-
-static int
-ocp_device_remove(struct device *dev)
-{
- struct ocp_device *ocp_dev = to_ocp_dev(dev);
-
- if (ocp_dev->driver) {
- if (ocp_dev->driver->remove)
- ocp_dev->driver->remove(ocp_dev);
- ocp_dev->driver = NULL;
- }
- return 0;
-}
-
-static int
-ocp_device_suspend(struct device *dev, pm_message_t state)
-{
- struct ocp_device *ocp_dev = to_ocp_dev(dev);
- struct ocp_driver *ocp_drv = to_ocp_drv(dev->driver);
-
- if (dev->driver && ocp_drv->suspend)
- return ocp_drv->suspend(ocp_dev, state);
- return 0;
-}
-
-static int
-ocp_device_resume(struct device *dev)
-{
- struct ocp_device *ocp_dev = to_ocp_dev(dev);
- struct ocp_driver *ocp_drv = to_ocp_drv(dev->driver);
-
- if (dev->driver && ocp_drv->resume)
- return ocp_drv->resume(ocp_dev);
- return 0;
-}
-
-struct bus_type ocp_bus_type = {
- .name = "ocp",
- .match = ocp_device_match,
- .probe = ocp_device_probe,
- .remove = ocp_device_remove,
- .suspend = ocp_device_suspend,
- .resume = ocp_device_resume,
-};
-
-/**
- * ocp_register_driver - Register an OCP driver
- * @drv: pointer to statically defined ocp_driver structure
- *
- * The driver's probe() callback is called either recursively
- * by this function or upon later call of ocp_driver_init
- *
- * NOTE: Detection of devices is a 2 pass step on this implementation,
- * hotswap isn't supported. First, all OCP devices are put in the device
- * list, _then_ all drivers are probed on each match.
- */
-int
-ocp_register_driver(struct ocp_driver *drv)
-{
- /* initialize common driver fields */
- drv->driver.name = drv->name;
- drv->driver.bus = &ocp_bus_type;
-
- /* register with core */
- return driver_register(&drv->driver);
-}
-
-/**
- * ocp_unregister_driver - Unregister an OCP driver
- * @drv: pointer to statically defined ocp_driver structure
- *
- * The driver's remove() callback is called recursively
- * by this function for any device already registered
- */
-void
-ocp_unregister_driver(struct ocp_driver *drv)
-{
- DBG(("ocp: ocp_unregister_driver(%s)...\n", drv->name));
-
- driver_unregister(&drv->driver);
-
- DBG(("ocp: ocp_unregister_driver(%s)... done.\n", drv->name));
-}
-
-/* Core of ocp_find_device(). Caller must hold ocp_devices_sem */
-static struct ocp_device *
-__ocp_find_device(unsigned int vendor, unsigned int function, int index)
-{
- struct list_head *entry;
- struct ocp_device *dev, *found = NULL;
-
- DBG(("ocp: __ocp_find_device(vendor: %x, function: %x, index: %d)...\n", vendor, function, index));
-
- list_for_each(entry, &ocp_devices) {
- dev = list_entry(entry, struct ocp_device, link);
- if (vendor != OCP_ANY_ID && vendor != dev->def->vendor)
- continue;
- if (function != OCP_ANY_ID && function != dev->def->function)
- continue;
- if (index != OCP_ANY_INDEX && index != dev->def->index)
- continue;
- found = dev;
- break;
- }
-
- DBG(("ocp: __ocp_find_device(vendor: %x, function: %x, index: %d)... done\n", vendor, function, index));
-
- return found;
-}
-
-/**
- * ocp_find_device - Find a device by function & index
- * @vendor: vendor ID of the device (or OCP_ANY_ID)
- * @function: function code of the device (or OCP_ANY_ID)
- * @idx: index of the device (or OCP_ANY_INDEX)
- *
- * This function allows a lookup of a given function by it's
- * index, it's typically used to find the MAL or ZMII associated
- * with an EMAC or similar horrors.
- * You can pass vendor, though you usually want OCP_ANY_ID there...
- */
-struct ocp_device *
-ocp_find_device(unsigned int vendor, unsigned int function, int index)
-{
- struct ocp_device *dev;
-
- down_read(&ocp_devices_sem);
- dev = __ocp_find_device(vendor, function, index);
- up_read(&ocp_devices_sem);
-
- return dev;
-}
-
-/**
- * ocp_get_one_device - Find a def by function & index
- * @vendor: vendor ID of the device (or OCP_ANY_ID)
- * @function: function code of the device (or OCP_ANY_ID)
- * @idx: index of the device (or OCP_ANY_INDEX)
- *
- * This function allows a lookup of a given ocp_def by it's
- * vendor, function, and index. The main purpose for is to
- * allow modification of the def before binding to the driver
- */
-struct ocp_def *
-ocp_get_one_device(unsigned int vendor, unsigned int function, int index)
-{
- struct ocp_device *dev;
- struct ocp_def *found = NULL;
-
- DBG(("ocp: ocp_get_one_device(vendor: %x, function: %x, index: %d)...\n",
- vendor, function, index));
-
- dev = ocp_find_device(vendor, function, index);
-
- if (dev)
- found = dev->def;
-
- DBG(("ocp: ocp_get_one_device(vendor: %x, function: %x, index: %d)... done.\n",
- vendor, function, index));
-
- return found;
-}
-
-/**
- * ocp_add_one_device - Add a device
- * @def: static device definition structure
- *
- * This function adds a device definition to the
- * device list. It may only be called before
- * ocp_driver_init() and will return an error
- * otherwise.
- */
-int
-ocp_add_one_device(struct ocp_def *def)
-{
- struct ocp_device *dev;
-
- DBG(("ocp: ocp_add_one_device()...\n"));
-
- /* Can't be called after ocp driver init */
- if (ocp_inited)
- return 1;
-
- if (mem_init_done)
- dev = kmalloc(sizeof(*dev), GFP_KERNEL);
- else
- dev = alloc_bootmem(sizeof(*dev));
-
- if (dev == NULL)
- return 1;
- memset(dev, 0, sizeof(*dev));
- dev->def = def;
- dev->current_state = 4;
- sprintf(dev->name, "OCP device %04x:%04x:%04x",
- dev->def->vendor, dev->def->function, dev->def->index);
- down_write(&ocp_devices_sem);
- list_add_tail(&dev->link, &ocp_devices);
- up_write(&ocp_devices_sem);
-
- DBG(("ocp: ocp_add_one_device()...done\n"));
-
- return 0;
-}
-
-/**
- * ocp_remove_one_device - Remove a device by function & index
- * @vendor: vendor ID of the device (or OCP_ANY_ID)
- * @function: function code of the device (or OCP_ANY_ID)
- * @idx: index of the device (or OCP_ANY_INDEX)
- *
- * This function allows removal of a given function by its
- * index. It may only be called before ocp_driver_init()
- * and will return an error otherwise.
- */
-int
-ocp_remove_one_device(unsigned int vendor, unsigned int function, int index)
-{
- struct ocp_device *dev;
-
- DBG(("ocp: ocp_remove_one_device(vendor: %x, function: %x, index: %d)...\n", vendor, function, index));
-
- /* Can't be called after ocp driver init */
- if (ocp_inited)
- return 1;
-
- down_write(&ocp_devices_sem);
- dev = __ocp_find_device(vendor, function, index);
- list_del(&dev->link);
- up_write(&ocp_devices_sem);
-
- DBG(("ocp: ocp_remove_one_device(vendor: %x, function: %x, index: %d)... done.\n", vendor, function, index));
-
- return 0;
-}
-
-/**
- * ocp_for_each_device - Iterate over OCP devices
- * @callback: routine to execute for each ocp device.
- * @arg: user data to be passed to callback routine.
- *
- * This routine holds the ocp_device semaphore, so the
- * callback routine cannot modify the ocp_device list.
- */
-void
-ocp_for_each_device(void(*callback)(struct ocp_device *, void *arg), void *arg)
-{
- struct list_head *entry;
-
- if (callback) {
- down_read(&ocp_devices_sem);
- list_for_each(entry, &ocp_devices)
- callback(list_entry(entry, struct ocp_device, link),
- arg);
- up_read(&ocp_devices_sem);
- }
-}
-
-/**
- * ocp_early_init - Init OCP device management
- *
- * This function builds the list of devices before setup_arch.
- * This allows platform code to modify the device lists before
- * they are bound to drivers (changes to paddr, removing devices
- * etc)
- */
-int __init
-ocp_early_init(void)
-{
- struct ocp_def *def;
-
- DBG(("ocp: ocp_early_init()...\n"));
-
- /* Fill the devices list */
- for (def = core_ocp; def->vendor != OCP_VENDOR_INVALID; def++)
- ocp_add_one_device(def);
-
- DBG(("ocp: ocp_early_init()... done.\n"));
-
- return 0;
-}
-
-/**
- * ocp_driver_init - Init OCP device management
- *
- * This function is meant to be called via OCP bus registration.
- */
-static int __init
-ocp_driver_init(void)
-{
- int ret = 0, index = 0;
- struct device *ocp_bus;
- struct list_head *entry;
- struct ocp_device *dev;
-
- if (ocp_inited)
- return ret;
- ocp_inited = 1;
-
- DBG(("ocp: ocp_driver_init()...\n"));
-
- /* Allocate/register primary OCP bus */
- ocp_bus = kzalloc(sizeof(struct device), GFP_KERNEL);
- if (ocp_bus == NULL)
- return 1;
- strcpy(ocp_bus->bus_id, "ocp");
-
- bus_register(&ocp_bus_type);
-
- device_register(ocp_bus);
-
- /* Put each OCP device into global device list */
- list_for_each(entry, &ocp_devices) {
- dev = list_entry(entry, struct ocp_device, link);
- sprintf(dev->dev.bus_id, "%2.2x", index);
- dev->dev.parent = ocp_bus;
- dev->dev.bus = &ocp_bus_type;
- device_register(&dev->dev);
- ocp_create_sysfs_dev_files(dev);
- index++;
- }
-
- DBG(("ocp: ocp_driver_init()... done.\n"));
-
- return 0;
-}
-
-postcore_initcall(ocp_driver_init);
-
-EXPORT_SYMBOL(ocp_bus_type);
-EXPORT_SYMBOL(ocp_find_device);
-EXPORT_SYMBOL(ocp_register_driver);
-EXPORT_SYMBOL(ocp_unregister_driver);