755 lines
19 KiB
C
755 lines
19 KiB
C
/*
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* Bus & driver management routines for devices within
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* a MacIO ASIC. Interface to new driver model mostly
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* stolen from the PCI version.
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*
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* Copyright (C) 2005 Ben. Herrenschmidt (benh@kernel.crashing.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* TODO:
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*
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* - Don't probe below media bay by default, but instead provide
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* some hooks for media bay to dynamically add/remove it's own
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* sub-devices.
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*/
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#include <linux/config.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <asm/machdep.h>
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#include <asm/macio.h>
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#include <asm/pmac_feature.h>
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#include <asm/prom.h>
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#include <asm/pci-bridge.h>
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#undef DEBUG
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#define MAX_NODE_NAME_SIZE (BUS_ID_SIZE - 12)
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static struct macio_chip *macio_on_hold;
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static int macio_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct macio_dev * macio_dev = to_macio_device(dev);
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struct macio_driver * macio_drv = to_macio_driver(drv);
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const struct of_device_id * matches = macio_drv->match_table;
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if (!matches)
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return 0;
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return of_match_device(matches, &macio_dev->ofdev) != NULL;
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}
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struct macio_dev *macio_dev_get(struct macio_dev *dev)
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{
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struct device *tmp;
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if (!dev)
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return NULL;
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tmp = get_device(&dev->ofdev.dev);
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if (tmp)
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return to_macio_device(tmp);
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else
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return NULL;
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}
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void macio_dev_put(struct macio_dev *dev)
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{
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if (dev)
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put_device(&dev->ofdev.dev);
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}
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static int macio_device_probe(struct device *dev)
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{
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int error = -ENODEV;
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struct macio_driver *drv;
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struct macio_dev *macio_dev;
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const struct of_device_id *match;
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drv = to_macio_driver(dev->driver);
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macio_dev = to_macio_device(dev);
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if (!drv->probe)
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return error;
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macio_dev_get(macio_dev);
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match = of_match_device(drv->match_table, &macio_dev->ofdev);
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if (match)
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error = drv->probe(macio_dev, match);
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if (error)
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macio_dev_put(macio_dev);
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return error;
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}
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static int macio_device_remove(struct device *dev)
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{
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struct macio_dev * macio_dev = to_macio_device(dev);
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struct macio_driver * drv = to_macio_driver(dev->driver);
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if (dev->driver && drv->remove)
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drv->remove(macio_dev);
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macio_dev_put(macio_dev);
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return 0;
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}
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static void macio_device_shutdown(struct device *dev)
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{
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struct macio_dev * macio_dev = to_macio_device(dev);
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struct macio_driver * drv = to_macio_driver(dev->driver);
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if (dev->driver && drv->shutdown)
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drv->shutdown(macio_dev);
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}
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static int macio_device_suspend(struct device *dev, pm_message_t state)
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{
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struct macio_dev * macio_dev = to_macio_device(dev);
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struct macio_driver * drv = to_macio_driver(dev->driver);
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if (dev->driver && drv->suspend)
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return drv->suspend(macio_dev, state);
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return 0;
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}
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static int macio_device_resume(struct device * dev)
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{
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struct macio_dev * macio_dev = to_macio_device(dev);
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struct macio_driver * drv = to_macio_driver(dev->driver);
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if (dev->driver && drv->resume)
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return drv->resume(macio_dev);
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return 0;
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}
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static int macio_uevent(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size)
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{
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struct macio_dev * macio_dev;
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struct of_device * of;
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char *scratch, *compat;
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int i = 0;
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int length = 0;
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int cplen, seen = 0;
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if (!dev)
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return -ENODEV;
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macio_dev = to_macio_device(dev);
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if (!macio_dev)
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return -ENODEV;
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of = &macio_dev->ofdev;
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scratch = buffer;
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/* stuff we want to pass to /sbin/hotplug */
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envp[i++] = scratch;
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length += scnprintf (scratch, buffer_size - length, "OF_NAME=%s",
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of->node->name);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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++length;
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scratch += length;
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envp[i++] = scratch;
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length += scnprintf (scratch, buffer_size - length, "OF_TYPE=%s",
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of->node->type);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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++length;
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scratch += length;
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/* Since the compatible field can contain pretty much anything
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* it's not really legal to split it out with commas. We split it
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* up using a number of environment variables instead. */
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compat = (char *) get_property(of->node, "compatible", &cplen);
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while (compat && cplen > 0) {
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int l;
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envp[i++] = scratch;
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length += scnprintf (scratch, buffer_size - length,
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"OF_COMPATIBLE_%d=%s", seen, compat);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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length++;
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scratch += length;
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l = strlen (compat) + 1;
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compat += l;
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cplen -= l;
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seen++;
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}
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envp[i++] = scratch;
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length += scnprintf (scratch, buffer_size - length,
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"OF_COMPATIBLE_N=%d", seen);
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if ((buffer_size - length <= 0) || (i >= num_envp))
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return -ENOMEM;
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++length;
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scratch += length;
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envp[i] = NULL;
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return 0;
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}
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extern struct device_attribute macio_dev_attrs[];
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struct bus_type macio_bus_type = {
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.name = "macio",
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.match = macio_bus_match,
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.uevent = macio_uevent,
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.suspend = macio_device_suspend,
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.resume = macio_device_resume,
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.dev_attrs = macio_dev_attrs,
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};
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static int __init macio_bus_driver_init(void)
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{
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return bus_register(&macio_bus_type);
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}
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postcore_initcall(macio_bus_driver_init);
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/**
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* macio_release_dev - free a macio device structure when all users of it are
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* finished.
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* @dev: device that's been disconnected
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*
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* Will be called only by the device core when all users of this macio device
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* are done. This currently means never as we don't hot remove any macio
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* device yet, though that will happen with mediabay based devices in a later
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* implementation.
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*/
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static void macio_release_dev(struct device *dev)
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{
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struct macio_dev *mdev;
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mdev = to_macio_device(dev);
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kfree(mdev);
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}
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/**
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* macio_resource_quirks - tweak or skip some resources for a device
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* @np: pointer to the device node
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* @res: resulting resource
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* @index: index of resource in node
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*
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* If this routine returns non-null, then the resource is completely
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* skipped.
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*/
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static int macio_resource_quirks(struct device_node *np, struct resource *res,
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int index)
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{
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if (res->flags & IORESOURCE_MEM) {
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/* Grand Central has too large resource 0 on some machines */
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if (index == 0 && !strcmp(np->name, "gc"))
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res->end = res->start + 0x1ffff;
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/* Airport has bogus resource 2 */
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if (index >= 2 && !strcmp(np->name, "radio"))
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return 1;
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#ifndef CONFIG_PPC64
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/* DBDMAs may have bogus sizes */
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if ((res->start & 0x0001f000) == 0x00008000)
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res->end = res->start + 0xff;
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#endif /* CONFIG_PPC64 */
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/* ESCC parent eats child resources. We could have added a
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* level of hierarchy, but I don't really feel the need
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* for it
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*/
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if (!strcmp(np->name, "escc"))
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return 1;
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/* ESCC has bogus resources >= 3 */
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if (index >= 3 && !(strcmp(np->name, "ch-a") &&
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strcmp(np->name, "ch-b")))
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return 1;
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/* Media bay has too many resources, keep only first one */
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if (index > 0 && !strcmp(np->name, "media-bay"))
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return 1;
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/* Some older IDE resources have bogus sizes */
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if (!(strcmp(np->name, "IDE") && strcmp(np->name, "ATA") &&
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strcmp(np->type, "ide") && strcmp(np->type, "ata"))) {
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if (index == 0 && (res->end - res->start) > 0xfff)
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res->end = res->start + 0xfff;
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if (index == 1 && (res->end - res->start) > 0xff)
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res->end = res->start + 0xff;
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}
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}
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return 0;
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}
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static void macio_setup_interrupts(struct macio_dev *dev)
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{
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struct device_node *np = dev->ofdev.node;
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int i,j;
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/* For now, we use pre-parsed entries in the device-tree for
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* interrupt routing and addresses, but we should change that
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* to dynamically parsed entries and so get rid of most of the
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* clutter in struct device_node
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*/
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for (i = j = 0; i < np->n_intrs; i++) {
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struct resource *res = &dev->interrupt[j];
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if (j >= MACIO_DEV_COUNT_IRQS)
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break;
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res->start = np->intrs[i].line;
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res->flags = IORESOURCE_IO;
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if (np->intrs[j].sense)
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res->flags |= IORESOURCE_IRQ_LOWLEVEL;
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else
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res->flags |= IORESOURCE_IRQ_HIGHEDGE;
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res->name = dev->ofdev.dev.bus_id;
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if (macio_resource_quirks(np, res, i))
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memset(res, 0, sizeof(struct resource));
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else
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j++;
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}
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dev->n_interrupts = j;
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}
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static void macio_setup_resources(struct macio_dev *dev,
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struct resource *parent_res)
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{
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struct device_node *np = dev->ofdev.node;
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struct resource r;
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int index;
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for (index = 0; of_address_to_resource(np, index, &r) == 0; index++) {
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struct resource *res = &dev->resource[index];
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if (index >= MACIO_DEV_COUNT_RESOURCES)
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break;
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*res = r;
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res->name = dev->ofdev.dev.bus_id;
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if (macio_resource_quirks(np, res, index)) {
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memset(res, 0, sizeof(struct resource));
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continue;
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}
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/* Currently, we consider failure as harmless, this may
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* change in the future, once I've found all the device
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* tree bugs in older machines & worked around them
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*/
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if (insert_resource(parent_res, res)) {
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printk(KERN_WARNING "Can't request resource "
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"%d for MacIO device %s\n",
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index, dev->ofdev.dev.bus_id);
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}
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}
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dev->n_resources = index;
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}
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/**
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* macio_add_one_device - Add one device from OF node to the device tree
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* @chip: pointer to the macio_chip holding the device
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* @np: pointer to the device node in the OF tree
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* @in_bay: set to 1 if device is part of a media-bay
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*
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* When media-bay is changed to hotswap drivers, this function will
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* be exposed to the bay driver some way...
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*/
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static struct macio_dev * macio_add_one_device(struct macio_chip *chip,
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struct device *parent,
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struct device_node *np,
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struct macio_dev *in_bay,
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struct resource *parent_res)
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{
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struct macio_dev *dev;
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u32 *reg;
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if (np == NULL)
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return NULL;
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dev = kmalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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memset(dev, 0, sizeof(*dev));
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dev->bus = &chip->lbus;
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dev->media_bay = in_bay;
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dev->ofdev.node = np;
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dev->ofdev.dma_mask = 0xffffffffUL;
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dev->ofdev.dev.dma_mask = &dev->ofdev.dma_mask;
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dev->ofdev.dev.parent = parent;
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dev->ofdev.dev.bus = &macio_bus_type;
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dev->ofdev.dev.release = macio_release_dev;
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#ifdef DEBUG
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printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
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dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
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#endif
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/* MacIO itself has a different reg, we use it's PCI base */
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if (np == chip->of_node) {
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sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s",
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chip->lbus.index,
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#ifdef CONFIG_PCI
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pci_resource_start(chip->lbus.pdev, 0),
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#else
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0, /* NuBus may want to do something better here */
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#endif
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MAX_NODE_NAME_SIZE, np->name);
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} else {
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reg = (u32 *)get_property(np, "reg", NULL);
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sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s",
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chip->lbus.index,
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reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
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}
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/* Setup interrupts & resources */
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macio_setup_interrupts(dev);
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macio_setup_resources(dev, parent_res);
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/* Register with core */
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if (of_device_register(&dev->ofdev) != 0) {
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printk(KERN_DEBUG"macio: device registration error for %s!\n",
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dev->ofdev.dev.bus_id);
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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static int macio_skip_device(struct device_node *np)
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{
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if (strncmp(np->name, "battery", 7) == 0)
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return 1;
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if (strncmp(np->name, "escc-legacy", 11) == 0)
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return 1;
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return 0;
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}
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/**
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* macio_pci_add_devices - Adds sub-devices of mac-io to the device tree
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* @chip: pointer to the macio_chip holding the devices
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*
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* This function will do the job of extracting devices from the
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* Open Firmware device tree, build macio_dev structures and add
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* them to the Linux device tree.
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*
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* For now, childs of media-bay are added now as well. This will
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* change rsn though.
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*/
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static void macio_pci_add_devices(struct macio_chip *chip)
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{
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struct device_node *np, *pnode;
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struct macio_dev *rdev, *mdev, *mbdev = NULL, *sdev = NULL;
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struct device *parent = NULL;
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struct resource *root_res = &iomem_resource;
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/* Add a node for the macio bus itself */
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#ifdef CONFIG_PCI
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if (chip->lbus.pdev) {
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parent = &chip->lbus.pdev->dev;
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root_res = &chip->lbus.pdev->resource[0];
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}
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#endif
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pnode = of_node_get(chip->of_node);
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if (pnode == NULL)
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return;
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/* Add macio itself to hierarchy */
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rdev = macio_add_one_device(chip, parent, pnode, NULL, root_res);
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if (rdev == NULL)
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return;
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root_res = &rdev->resource[0];
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/* First scan 1st level */
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for (np = NULL; (np = of_get_next_child(pnode, np)) != NULL;) {
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if (macio_skip_device(np))
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continue;
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of_node_get(np);
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mdev = macio_add_one_device(chip, &rdev->ofdev.dev, np, NULL,
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root_res);
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if (mdev == NULL)
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of_node_put(np);
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else if (strncmp(np->name, "media-bay", 9) == 0)
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mbdev = mdev;
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else if (strncmp(np->name, "escc", 4) == 0)
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sdev = mdev;
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}
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/* Add media bay devices if any */
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if (mbdev)
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for (np = NULL; (np = of_get_next_child(mbdev->ofdev.node, np))
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!= NULL;) {
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if (macio_skip_device(np))
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continue;
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of_node_get(np);
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if (macio_add_one_device(chip, &mbdev->ofdev.dev, np,
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mbdev, root_res) == NULL)
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of_node_put(np);
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}
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/* Add serial ports if any */
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if (sdev) {
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for (np = NULL; (np = of_get_next_child(sdev->ofdev.node, np))
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!= NULL;) {
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if (macio_skip_device(np))
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continue;
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of_node_get(np);
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if (macio_add_one_device(chip, &sdev->ofdev.dev, np,
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NULL, root_res) == NULL)
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of_node_put(np);
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}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
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 __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);
|