Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 485 insertions, 0 deletions

diff --git a/arch/ppc/syslib/ocp.c b/arch/ppc/syslib/ocp.c
new file mode 100644
index 0000000..a5156c5
--- /dev/null
+++ b/arch/ppc/syslib/ocp.c
@@ -0,0 +1,485 @@
+/*
+ * 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, PPC85xx, 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 accomodate 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/config.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 <asm/io.h>
+#include <asm/ocp.h>
+#include <asm/errno.h>
+#include <asm/rwsem.h>
+#include <asm/semaphore.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, 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, u32 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,
+	.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;
+	drv->driver.probe = ocp_device_probe;
+	drv->driver.remove = ocp_device_remove;
+
+	/* 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((struct list_head *)dev);
+	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 = kmalloc(sizeof(struct device), GFP_KERNEL);
+	if (ocp_bus == NULL)
+		return 1;
+	memset(ocp_bus, 0, sizeof(struct device));
+	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);