macio_asic.c

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/*
 * 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 ([e-mail])
 *
 *  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 <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;
}

extern struct device_attribute macio_dev_attrs[];

struct bus_type macio_bus_type = {
       .name	= "macio",
       .match	= macio_bus_match,
       .uevent = of_device_uevent,
       .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->ofdev.dev.bus_id;
	}
	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.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.node;
	unsigned int irq;
	int i = 0, j = 0;

	for (;;) {
		struct resource *res = &dev->interrupt[j];

		if (j >= MACIO_DEV_COUNT_IRQS)
			break;
		irq = irq_of_parse_and_map(np, i++);
		if (irq == NO_IRQ)
			break;
		res->start = irq;
		res->flags = IORESOURCE_IRQ;
		res->name = dev->ofdev.dev.bus_id;
		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.node;
	struct resource r;
	int index;

	for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) {
		struct resource *res = &dev->resource[index];
		if (index >= MACIO_DEV_COUNT_RESOURCES)
			break;
		*res = r;
		res->name = dev->ofdev.dev.bus_id;

		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->ofdev.dev.bus_id);
		}
	}
	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;