device-init.c

linux内核源码

/*
 *  PS3 device registration routines.
 *
 *  Copyright (C) 2007 Sony Computer Entertainment Inc.
 *  Copyright 2007 Sony Corp.
 *
 *  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; version 2 of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/init.h>

#include <asm/firmware.h>
#include <asm/lv1call.h>
#include <asm/ps3stor.h>

#include "platform.h"

/**
 * ps3_setup_gelic_device - Setup and register a gelic device instance.
 *
 * Allocates memory for a struct ps3_system_bus_device instance, initialises the
 * structure members, and registers the device instance with the system bus.
 */

static int __init ps3_setup_gelic_device(
	const struct ps3_repository_device *repo)
{
	int result;
	struct layout {
		struct ps3_system_bus_device dev;
		struct ps3_dma_region d_region;
	} *p;

	pr_debug(" -> %s:%d\n", __func__, __LINE__);

	BUG_ON(repo->bus_type != PS3_BUS_TYPE_SB);
	BUG_ON(repo->dev_type != PS3_DEV_TYPE_SB_GELIC);

	p = kzalloc(sizeof(struct layout), GFP_KERNEL);

	if (!p) {
		result = -ENOMEM;
		goto fail_malloc;
	}

	p->dev.match_id = PS3_MATCH_ID_GELIC;
	p->dev.dev_type = PS3_DEVICE_TYPE_SB;
	p->dev.bus_id = repo->bus_id;
	p->dev.dev_id = repo->dev_id;
	p->dev.d_region = &p->d_region;

	result = ps3_repository_find_interrupt(repo,
		PS3_INTERRUPT_TYPE_EVENT_PORT, &p->dev.interrupt_id);

	if (result) {
		pr_debug("%s:%d ps3_repository_find_interrupt failed\n",
			__func__, __LINE__);
		goto fail_find_interrupt;
	}

	BUG_ON(p->dev.interrupt_id != 0);

	result = ps3_dma_region_init(&p->dev, p->dev.d_region, PS3_DMA_64K,
		PS3_DMA_OTHER, NULL, 0);

	if (result) {
		pr_debug("%s:%d ps3_dma_region_init failed\n",
			__func__, __LINE__);
		goto fail_dma_init;
	}

	result = ps3_system_bus_device_register(&p->dev);

	if (result) {
		pr_debug("%s:%d ps3_system_bus_device_register failed\n",
			__func__, __LINE__);
		goto fail_device_register;
	}

	pr_debug(" <- %s:%d\n", __func__, __LINE__);
	return result;

fail_device_register:
fail_dma_init:
fail_find_interrupt:
	kfree(p);
fail_malloc:
	pr_debug(" <- %s:%d: fail.\n", __func__, __LINE__);
	return result;
}

static int __init_refok ps3_setup_uhc_device(
	const struct ps3_repository_device *repo, enum ps3_match_id match_id,
	enum ps3_interrupt_type interrupt_type, enum ps3_reg_type reg_type)
{
	int result;
	struct layout {
		struct ps3_system_bus_device dev;
		struct ps3_dma_region d_region;
		struct ps3_mmio_region m_region;
	} *p;
	u64 bus_addr;
	u64 len;

	pr_debug(" -> %s:%d\n", __func__, __LINE__);

	BUG_ON(repo->bus_type != PS3_BUS_TYPE_SB);
	BUG_ON(repo->dev_type != PS3_DEV_TYPE_SB_USB);

	p = kzalloc(sizeof(struct layout), GFP_KERNEL);

	if (!p) {
		result = -ENOMEM;
		goto fail_malloc;
	}

	p->dev.match_id = match_id;
	p->dev.dev_type = PS3_DEVICE_TYPE_SB;
	p->dev.bus_id = repo->bus_id;
	p->dev.dev_id = repo->dev_id;
	p->dev.d_region = &p->d_region;
	p->dev.m_region = &p->m_region;

	result = ps3_repository_find_interrupt(repo,
		interrupt_type, &p->dev.interrupt_id);

	if (result) {
		pr_debug("%s:%d ps3_repository_find_interrupt failed\n",
			__func__, __LINE__);
		goto fail_find_interrupt;
	}

	result = ps3_repository_find_reg(repo, reg_type,
		&bus_addr, &len);

	if (result) {
		pr_debug("%s:%d ps3_repository_find_reg failed\n",
			__func__, __LINE__);
		goto fail_find_reg;
	}

	result = ps3_dma_region_init(&p->dev, p->dev.d_region, PS3_DMA_64K,
		PS3_DMA_INTERNAL, NULL, 0);

	if (result) {
		pr_debug("%s:%d ps3_dma_region_init failed\n",
			__func__, __LINE__);
		goto fail_dma_init;
	}

	result = ps3_mmio_region_init(&p->dev, p->dev.m_region, bus_addr, len,
		PS3_MMIO_4K);

	if (result) {
		pr_debug("%s:%d ps3_mmio_region_init failed\n",
			__func__, __LINE__);
		goto fail_mmio_init;
	}

	result = ps3_system_bus_device_register(&p->dev);

	if (result) {
		pr_debug("%s:%d ps3_system_bus_device_register failed\n",
			__func__, __LINE__);
		goto fail_device_register;
	}

	pr_debug(" <- %s:%d\n", __func__, __LINE__);
	return result;

fail_device_register:
fail_mmio_init:
fail_dma_init:
fail_find_reg:
fail_find_interrupt:
	kfree(p);
fail_malloc:
	pr_debug(" <- %s:%d: fail.\n", __func__, __LINE__);
	return result;
}

static int __init ps3_setup_ehci_device(
	const struct ps3_repository_device *repo)
{
	return ps3_setup_uhc_device(repo, PS3_MATCH_ID_EHCI,
		PS3_INTERRUPT_TYPE_SB_EHCI, PS3_REG_TYPE_SB_EHCI);
}

static int __init ps3_setup_ohci_device(
	const struct ps3_repository_device *repo)
{
	return ps3_setup_uhc_device(repo, PS3_MATCH_ID_OHCI,
		PS3_INTERRUPT_TYPE_SB_OHCI, PS3_REG_TYPE_SB_OHCI);
}

static int __init ps3_setup_vuart_device(enum ps3_match_id match_id,
	unsigned int port_number)
{
	int result;
	struct layout {
		struct ps3_system_bus_device dev;
	} *p;

	pr_debug(" -> %s:%d: match_id %u, port %u\n", __func__, __LINE__,
		match_id, port_number);

	p = kzalloc(sizeof(struct layout), GFP_KERNEL);

	if (!p)
		return -ENOMEM;

	p->dev.match_id = match_id;
	p->dev.dev_type = PS3_DEVICE_TYPE_VUART;
	p->dev.port_number = port_number;

	result = ps3_system_bus_device_register(&p->dev);

	if (result)
		pr_debug("%s:%d ps3_system_bus_device_register failed\n",
			__func__, __LINE__);

	pr_debug(" <- %s:%d\n", __func__, __LINE__);
	return result;
}

static int ps3stor_wait_for_completion(u64 dev_id, u64 tag,
				       unsigned int timeout)
{
	int result = -1;
	unsigned int retries = 0;
	u64 status;

	for (retries = 0; retries < timeout; retries++) {
		result = lv1_storage_check_async_status(dev_id, tag, &status);
		if (!result)
			break;

		msleep(1);
	}

	if (result)
		pr_debug("%s:%u: check_async_status: %s, status %lx\n",
			 __func__, __LINE__, ps3_result(result), status);

	return result;
}

/**
 * ps3_storage_wait_for_device - Wait for a storage device to become ready.
 * @repo: The repository device to wait for.
 *
 * Uses the hypervisor's storage device notification mechanism to wait until
 * a storage device is ready.  The device notification mechanism uses a
 * psuedo device (id = -1) to asynchronously notify the guest when storage
 * devices become ready.  The notification device has a block size of 512
 * bytes.
 */

static int ps3_storage_wait_for_device(const struct ps3_repository_device *repo)
{
	int error = -ENODEV;
	int result;
	const u64 notification_dev_id = (u64)-1LL;
	const unsigned int timeout = HZ;
	u64 lpar;
	u64 tag;
	void *buf;
	enum ps3_notify_type {
		notify_device_ready = 0,
		notify_region_probe = 1,
		notify_region_update = 2,
	};
	struct {
		u64 operation_code;	/* must be zero */
		u64 event_mask;		/* OR of 1UL << enum ps3_notify_type */
	} *notify_cmd;
	struct {
		u64 event_type;		/* enum ps3_notify_type */
		u64 bus_id;
		u64 dev_id;
		u64 dev_type;
		u64 dev_port;
	} *notify_event;

	pr_debug(" -> %s:%u: (%u:%u:%u)\n", __func__, __LINE__, repo->bus_id,
		 repo->dev_id, repo->dev_type);

	buf = kzalloc(512, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	lpar = ps3_mm_phys_to_lpar(__pa(buf));
	notify_cmd = buf;
	notify_event = buf;

	result = lv1_open_device(repo->bus_id, notification_dev_id, 0);
	if (result) {
		printk(KERN_ERR "%s:%u: lv1_open_device %s\n", __func__,
		       __LINE__, ps3_result(result));
		goto fail_free;
	}

	/* Setup and write the request for device notification. */

	notify_cmd->operation_code = 0; /* must be zero */
	notify_cmd->event_mask = 1UL << notify_region_probe;

	result = lv1_storage_write(notification_dev_id, 0, 0, 1, 0, lpar,
				   &tag);
	if (result) {
		printk(KERN_ERR "%s:%u: write failed %s\n", __func__, __LINE__,
		       ps3_result(result));
		goto fail_close;
	}

	/* Wait for the write completion */

	result = ps3stor_wait_for_completion(notification_dev_id, tag,
					     timeout);
	if (result) {
		printk(KERN_ERR "%s:%u: write not completed %s\n", __func__,
		       __LINE__, ps3_result(result));
		goto fail_close;
	}

	/* Loop here processing the requested notification events. */

	while (1) {
		memset(notify_event, 0, sizeof(*notify_event));

		result = lv1_storage_read(notification_dev_id, 0, 0, 1, 0,
					  lpar, &tag);
		if (result) {
			printk(KERN_ERR "%s:%u: write failed %s\n", __func__,
			       __LINE__, ps3_result(result));
			break;
		}

		result = ps3stor_wait_for_completion(notification_dev_id, tag,
						     timeout);
		if (result) {
			printk(KERN_ERR "%s:%u: read not completed %s\n",
			       __func__, __LINE__, ps3_result(result));
			break;
		}

		pr_debug("%s:%d: notify event (%u:%u:%u): event_type 0x%lx, "
			 "port %lu\n", __func__, __LINE__, repo->bus_index,
			 repo->dev_index, repo->dev_type,
			 notify_event->event_type, notify_event->dev_port);

		if (notify_event->event_type != notify_region_probe ||
		    notify_event->bus_id != repo->bus_id) {
			pr_debug("%s:%u: bad notify_event: event %lu, "
				 "dev_id %lu, dev_type %lu\n",
				 __func__, __LINE__, notify_event->event_type,
				 notify_event->dev_id, notify_event->dev_type);
			break;
		}

		if (notify_event->dev_id == repo->dev_id &&
		    notify_event->dev_type == repo->dev_type) {
			pr_debug("%s:%u: device ready (%u:%u:%u)\n", __func__,
				 __LINE__, repo->bus_index, repo->dev_index,
				 repo->dev_type);
			error = 0;
			break;
		}

		if (notify_event->dev_id == repo->dev_id &&
		    notify_event->dev_type == PS3_DEV_TYPE_NOACCESS) {
			pr_debug("%s:%u: no access: dev_id %u\n", __func__,
				 __LINE__, repo->dev_id);
			break;
		}
	}

fail_close:
	lv1_close_device(repo->bus_id, notification_dev_id);
fail_free:
	kfree(buf);
	pr_debug(" <- %s:%u\n", __func__, __LINE__);
	return error;