Subversion Repositories test_project

/*

 * PS3 Storage Library

 *

 * 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.,

 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

 */

#include <linux/dma-mapping.h>

#include <asm/lv1call.h>

#include <asm/ps3stor.h>

static int ps3stor_probe_access(struct ps3_storage_device *dev)

{

        int res, error;

        unsigned int i;

        unsigned long n;

        if (dev->sbd.match_id == PS3_MATCH_ID_STOR_ROM) {

                /* special case: CD-ROM is assumed always accessible */

                dev->accessible_regions = 1;

                return 0;

        }

        error = -EPERM;

        for (i = 0; i < dev->num_regions; i++) {

                dev_dbg(&dev->sbd.core,

                        "%s:%u: checking accessibility of region %u\n",

                        __func__, __LINE__, i);

                dev->region_idx = i;

                res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, 0, 1,

                                                 0);

                if (res) {

                        dev_dbg(&dev->sbd.core, "%s:%u: read failed, "

                                "region %u is not accessible\n", __func__,

                                __LINE__, i);

                        continue;

                }

                dev_dbg(&dev->sbd.core, "%s:%u: region %u is accessible\n",

                        __func__, __LINE__, i);

                set_bit(i, &dev->accessible_regions);

                /* We can access at least one region */

                error = 0;

        }

        if (error)

                return error;

        n = hweight_long(dev->accessible_regions);

        if (n > 1)

                dev_info(&dev->sbd.core,

                         "%s:%u: %lu accessible regions found. Only the first "

                         "one will be used\n",

                         __func__, __LINE__, n);

        dev->region_idx = __ffs(dev->accessible_regions);

        dev_info(&dev->sbd.core,

                 "First accessible region has index %u start %lu size %lu\n",

                 dev->region_idx, dev->regions[dev->region_idx].start,

                 dev->regions[dev->region_idx].size);

        return 0;

}

/**

 *      ps3stor_setup - Setup a storage device before use

 *      @dev: Pointer to a struct ps3_storage_device

 *      @handler: Pointer to an interrupt handler

 *

 *      Returns 0 for success, or an error code

 */

int ps3stor_setup(struct ps3_storage_device *dev, irq_handler_t handler)

{

        int error, res, alignment;

        enum ps3_dma_page_size page_size;

        error = ps3_open_hv_device(&dev->sbd);

        if (error) {

                dev_err(&dev->sbd.core,

                        "%s:%u: ps3_open_hv_device failed %d\n", __func__,

                        __LINE__, error);

                goto fail;

        }

        error = ps3_sb_event_receive_port_setup(&dev->sbd, PS3_BINDING_CPU_ANY,

                                                &dev->irq);

        if (error) {

                dev_err(&dev->sbd.core,

                        "%s:%u: ps3_sb_event_receive_port_setup failed %d\n",

                       __func__, __LINE__, error);

                goto fail_close_device;

        }

        error = request_irq(dev->irq, handler, IRQF_DISABLED,

                            dev->sbd.core.driver->name, dev);

        if (error) {

                dev_err(&dev->sbd.core, "%s:%u: request_irq failed %d\n",

                        __func__, __LINE__, error);

                goto fail_sb_event_receive_port_destroy;

        }

        alignment = min(__ffs(dev->bounce_size),

                        __ffs((unsigned long)dev->bounce_buf));

        if (alignment < 12) {

                dev_err(&dev->sbd.core,

                        "%s:%u: bounce buffer not aligned (%lx at 0x%p)\n",

                        __func__, __LINE__, dev->bounce_size, dev->bounce_buf);

                error = -EINVAL;

                goto fail_free_irq;

        } else if (alignment < 16)

                page_size = PS3_DMA_4K;

        else

                page_size = PS3_DMA_64K;

        dev->sbd.d_region = &dev->dma_region;

        ps3_dma_region_init(&dev->sbd, &dev->dma_region, page_size,

                            PS3_DMA_OTHER, dev->bounce_buf, dev->bounce_size);

        res = ps3_dma_region_create(&dev->dma_region);

        if (res) {

                dev_err(&dev->sbd.core, "%s:%u: cannot create DMA region\n",

                        __func__, __LINE__);

                error = -ENOMEM;

                goto fail_free_irq;

        }

        dev->bounce_lpar = ps3_mm_phys_to_lpar(__pa(dev->bounce_buf));

        dev->bounce_dma = dma_map_single(&dev->sbd.core, dev->bounce_buf,

                                         dev->bounce_size, DMA_BIDIRECTIONAL);

        if (!dev->bounce_dma) {

                dev_err(&dev->sbd.core, "%s:%u: map DMA region failed\n",

                        __func__, __LINE__);

                error = -ENODEV;

                goto fail_free_dma;

        }

        error = ps3stor_probe_access(dev);

        if (error) {

                dev_err(&dev->sbd.core, "%s:%u: No accessible regions found\n",

                        __func__, __LINE__);

                goto fail_unmap_dma;

        }

        return 0;

fail_unmap_dma:

        dma_unmap_single(&dev->sbd.core, dev->bounce_dma, dev->bounce_size,

                         DMA_BIDIRECTIONAL);

fail_free_dma:

        ps3_dma_region_free(&dev->dma_region);

fail_free_irq:

        free_irq(dev->irq, dev);

fail_sb_event_receive_port_destroy:

        ps3_sb_event_receive_port_destroy(&dev->sbd, dev->irq);

fail_close_device:

        ps3_close_hv_device(&dev->sbd);

fail:

        return error;

}

EXPORT_SYMBOL_GPL(ps3stor_setup);

/**

 *      ps3stor_teardown - Tear down a storage device after use

 *      @dev: Pointer to a struct ps3_storage_device

 */

void ps3stor_teardown(struct ps3_storage_device *dev)

{

        int error;

        dma_unmap_single(&dev->sbd.core, dev->bounce_dma, dev->bounce_size,

                         DMA_BIDIRECTIONAL);

        ps3_dma_region_free(&dev->dma_region);

        free_irq(dev->irq, dev);

        error = ps3_sb_event_receive_port_destroy(&dev->sbd, dev->irq);

        if (error)

                dev_err(&dev->sbd.core,

                        "%s:%u: destroy event receive port failed %d\n",

                        __func__, __LINE__, error);

        error = ps3_close_hv_device(&dev->sbd);

        if (error)

                dev_err(&dev->sbd.core,

                        "%s:%u: ps3_close_hv_device failed %d\n", __func__,

                        __LINE__, error);

}

EXPORT_SYMBOL_GPL(ps3stor_teardown);

/**

 *      ps3stor_read_write_sectors - read/write from/to a storage device

 *      @dev: Pointer to a struct ps3_storage_device

 *      @lpar: HV logical partition address

 *      @start_sector: First sector to read/write

 *      @sectors: Number of sectors to read/write

 *      @write: Flag indicating write (non-zero) or read (zero)

 *

 *      Returns 0 for success, -1 in case of failure to submit the command, or

 *      an LV1 status value in case of other errors

 */

u64 ps3stor_read_write_sectors(struct ps3_storage_device *dev, u64 lpar,

                               u64 start_sector, u64 sectors, int write)

{

        unsigned int region_id = dev->regions[dev->region_idx].id;

        const char *op = write ? "write" : "read";

        int res;

        dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\n",

                __func__, __LINE__, op, sectors, start_sector);

        init_completion(&dev->done);

        res = write ? lv1_storage_write(dev->sbd.dev_id, region_id,

                                        start_sector, sectors, 0, lpar,

                                        &dev->tag)

                    : lv1_storage_read(dev->sbd.dev_id, region_id,

                                       start_sector, sectors, 0, lpar,

                                       &dev->tag);

        if (res) {

                dev_dbg(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,

                        __LINE__, op, res);

                return -1;

        }

        wait_for_completion(&dev->done);

        if (dev->lv1_status) {

                dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,

                        __LINE__, op, dev->lv1_status);

                return dev->lv1_status;

        }

        dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__, __LINE__,

                op);

        return 0;

}

EXPORT_SYMBOL_GPL(ps3stor_read_write_sectors);

/**

 *      ps3stor_send_command - send a device command to a storage device

 *      @dev: Pointer to a struct ps3_storage_device

 *      @cmd: Command number

 *      @arg1: First command argument

 *      @arg2: Second command argument

 *      @arg3: Third command argument

 *      @arg4: Fourth command argument

 *

 *      Returns 0 for success, -1 in case of failure to submit the command, or

 *      an LV1 status value in case of other errors

 */

u64 ps3stor_send_command(struct ps3_storage_device *dev, u64 cmd, u64 arg1,

                         u64 arg2, u64 arg3, u64 arg4)

{

        int res;

        dev_dbg(&dev->sbd.core, "%s:%u: send device command 0x%lx\n", __func__,

                __LINE__, cmd);

        init_completion(&dev->done);

        res = lv1_storage_send_device_command(dev->sbd.dev_id, cmd, arg1,

                                              arg2, arg3, arg4, &dev->tag);

        if (res) {

                dev_err(&dev->sbd.core,

                        "%s:%u: send_device_command 0x%lx failed %d\n",

                        __func__, __LINE__, cmd, res);

                return -1;

        }

        wait_for_completion(&dev->done);

        if (dev->lv1_status) {

                dev_dbg(&dev->sbd.core, "%s:%u: command 0x%lx failed 0x%lx\n",

                        __func__, __LINE__, cmd, dev->lv1_status);

                return dev->lv1_status;

        }

        dev_dbg(&dev->sbd.core, "%s:%u: command 0x%lx completed\n", __func__,

                __LINE__, cmd);

        return 0;

}

EXPORT_SYMBOL_GPL(ps3stor_send_command);

MODULE_LICENSE("GPL");

MODULE_DESCRIPTION("PS3 Storage Bus Library");

MODULE_AUTHOR("Sony Corporation");