303 lines
8.3 KiB
C
303 lines
8.3 KiB
C
/*
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* PS3 Storage Library
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*
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* Copyright (C) 2007 Sony Computer Entertainment Inc.
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* Copyright 2007 Sony Corp.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published
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* by the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/dma-mapping.h>
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#include <asm/lv1call.h>
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#include <asm/ps3stor.h>
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static int ps3stor_probe_access(struct ps3_storage_device *dev)
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{
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int res, error;
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unsigned int i;
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unsigned long n;
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if (dev->sbd.match_id == PS3_MATCH_ID_STOR_ROM) {
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/* special case: CD-ROM is assumed always accessible */
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dev->accessible_regions = 1;
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return 0;
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}
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error = -EPERM;
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for (i = 0; i < dev->num_regions; i++) {
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dev_dbg(&dev->sbd.core,
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"%s:%u: checking accessibility of region %u\n",
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__func__, __LINE__, i);
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dev->region_idx = i;
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res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, 0, 1,
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0);
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if (res) {
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dev_dbg(&dev->sbd.core, "%s:%u: read failed, "
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"region %u is not accessible\n", __func__,
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__LINE__, i);
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continue;
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}
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dev_dbg(&dev->sbd.core, "%s:%u: region %u is accessible\n",
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__func__, __LINE__, i);
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set_bit(i, &dev->accessible_regions);
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/* We can access at least one region */
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error = 0;
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}
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if (error)
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return error;
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n = hweight_long(dev->accessible_regions);
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if (n > 1)
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dev_info(&dev->sbd.core,
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"%s:%u: %lu accessible regions found. Only the first "
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"one will be used\n",
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__func__, __LINE__, n);
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dev->region_idx = __ffs(dev->accessible_regions);
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dev_info(&dev->sbd.core,
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"First accessible region has index %u start %lu size %lu\n",
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dev->region_idx, dev->regions[dev->region_idx].start,
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dev->regions[dev->region_idx].size);
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return 0;
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}
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/**
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* ps3stor_setup - Setup a storage device before use
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* @dev: Pointer to a struct ps3_storage_device
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* @handler: Pointer to an interrupt handler
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*
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* Returns 0 for success, or an error code
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*/
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int ps3stor_setup(struct ps3_storage_device *dev, irq_handler_t handler)
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{
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int error, res, alignment;
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enum ps3_dma_page_size page_size;
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error = ps3_open_hv_device(&dev->sbd);
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if (error) {
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dev_err(&dev->sbd.core,
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"%s:%u: ps3_open_hv_device failed %d\n", __func__,
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__LINE__, error);
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goto fail;
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}
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error = ps3_sb_event_receive_port_setup(&dev->sbd, PS3_BINDING_CPU_ANY,
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&dev->irq);
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if (error) {
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dev_err(&dev->sbd.core,
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"%s:%u: ps3_sb_event_receive_port_setup failed %d\n",
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__func__, __LINE__, error);
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goto fail_close_device;
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}
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error = request_irq(dev->irq, handler, IRQF_DISABLED,
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dev->sbd.core.driver->name, dev);
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if (error) {
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dev_err(&dev->sbd.core, "%s:%u: request_irq failed %d\n",
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__func__, __LINE__, error);
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goto fail_sb_event_receive_port_destroy;
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}
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alignment = min(__ffs(dev->bounce_size),
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__ffs((unsigned long)dev->bounce_buf));
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if (alignment < 12) {
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dev_err(&dev->sbd.core,
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"%s:%u: bounce buffer not aligned (%lx at 0x%p)\n",
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__func__, __LINE__, dev->bounce_size, dev->bounce_buf);
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error = -EINVAL;
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goto fail_free_irq;
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} else if (alignment < 16)
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page_size = PS3_DMA_4K;
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else
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page_size = PS3_DMA_64K;
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dev->sbd.d_region = &dev->dma_region;
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ps3_dma_region_init(&dev->sbd, &dev->dma_region, page_size,
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PS3_DMA_OTHER, dev->bounce_buf, dev->bounce_size);
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res = ps3_dma_region_create(&dev->dma_region);
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if (res) {
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dev_err(&dev->sbd.core, "%s:%u: cannot create DMA region\n",
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__func__, __LINE__);
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error = -ENOMEM;
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goto fail_free_irq;
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}
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dev->bounce_lpar = ps3_mm_phys_to_lpar(__pa(dev->bounce_buf));
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dev->bounce_dma = dma_map_single(&dev->sbd.core, dev->bounce_buf,
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dev->bounce_size, DMA_BIDIRECTIONAL);
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if (!dev->bounce_dma) {
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dev_err(&dev->sbd.core, "%s:%u: map DMA region failed\n",
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__func__, __LINE__);
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error = -ENODEV;
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goto fail_free_dma;
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}
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error = ps3stor_probe_access(dev);
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if (error) {
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dev_err(&dev->sbd.core, "%s:%u: No accessible regions found\n",
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__func__, __LINE__);
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goto fail_unmap_dma;
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}
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return 0;
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fail_unmap_dma:
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dma_unmap_single(&dev->sbd.core, dev->bounce_dma, dev->bounce_size,
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DMA_BIDIRECTIONAL);
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fail_free_dma:
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ps3_dma_region_free(&dev->dma_region);
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fail_free_irq:
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free_irq(dev->irq, dev);
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fail_sb_event_receive_port_destroy:
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ps3_sb_event_receive_port_destroy(&dev->sbd, dev->irq);
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fail_close_device:
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ps3_close_hv_device(&dev->sbd);
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fail:
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return error;
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}
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EXPORT_SYMBOL_GPL(ps3stor_setup);
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/**
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* ps3stor_teardown - Tear down a storage device after use
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* @dev: Pointer to a struct ps3_storage_device
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*/
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void ps3stor_teardown(struct ps3_storage_device *dev)
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{
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int error;
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dma_unmap_single(&dev->sbd.core, dev->bounce_dma, dev->bounce_size,
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DMA_BIDIRECTIONAL);
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ps3_dma_region_free(&dev->dma_region);
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free_irq(dev->irq, dev);
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error = ps3_sb_event_receive_port_destroy(&dev->sbd, dev->irq);
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if (error)
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dev_err(&dev->sbd.core,
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"%s:%u: destroy event receive port failed %d\n",
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__func__, __LINE__, error);
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error = ps3_close_hv_device(&dev->sbd);
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if (error)
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dev_err(&dev->sbd.core,
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"%s:%u: ps3_close_hv_device failed %d\n", __func__,
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__LINE__, error);
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}
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EXPORT_SYMBOL_GPL(ps3stor_teardown);
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/**
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* ps3stor_read_write_sectors - read/write from/to a storage device
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* @dev: Pointer to a struct ps3_storage_device
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* @lpar: HV logical partition address
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* @start_sector: First sector to read/write
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* @sectors: Number of sectors to read/write
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* @write: Flag indicating write (non-zero) or read (zero)
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*
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* Returns 0 for success, -1 in case of failure to submit the command, or
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* an LV1 status value in case of other errors
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*/
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u64 ps3stor_read_write_sectors(struct ps3_storage_device *dev, u64 lpar,
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u64 start_sector, u64 sectors, int write)
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{
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unsigned int region_id = dev->regions[dev->region_idx].id;
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const char *op = write ? "write" : "read";
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int res;
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dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\n",
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__func__, __LINE__, op, sectors, start_sector);
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init_completion(&dev->done);
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res = write ? lv1_storage_write(dev->sbd.dev_id, region_id,
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start_sector, sectors, 0, lpar,
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&dev->tag)
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: lv1_storage_read(dev->sbd.dev_id, region_id,
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start_sector, sectors, 0, lpar,
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&dev->tag);
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if (res) {
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dev_dbg(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
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__LINE__, op, res);
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return -1;
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}
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wait_for_completion(&dev->done);
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if (dev->lv1_status) {
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dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
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__LINE__, op, dev->lv1_status);
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return dev->lv1_status;
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}
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dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__, __LINE__,
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op);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ps3stor_read_write_sectors);
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/**
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* ps3stor_send_command - send a device command to a storage device
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* @dev: Pointer to a struct ps3_storage_device
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* @cmd: Command number
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* @arg1: First command argument
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* @arg2: Second command argument
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* @arg3: Third command argument
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* @arg4: Fourth command argument
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*
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* Returns 0 for success, -1 in case of failure to submit the command, or
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* an LV1 status value in case of other errors
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*/
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u64 ps3stor_send_command(struct ps3_storage_device *dev, u64 cmd, u64 arg1,
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u64 arg2, u64 arg3, u64 arg4)
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{
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int res;
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dev_dbg(&dev->sbd.core, "%s:%u: send device command 0x%lx\n", __func__,
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__LINE__, cmd);
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init_completion(&dev->done);
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res = lv1_storage_send_device_command(dev->sbd.dev_id, cmd, arg1,
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arg2, arg3, arg4, &dev->tag);
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if (res) {
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dev_err(&dev->sbd.core,
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"%s:%u: send_device_command 0x%lx failed %d\n",
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__func__, __LINE__, cmd, res);
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return -1;
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}
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wait_for_completion(&dev->done);
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if (dev->lv1_status) {
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dev_dbg(&dev->sbd.core, "%s:%u: command 0x%lx failed 0x%lx\n",
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__func__, __LINE__, cmd, dev->lv1_status);
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return dev->lv1_status;
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}
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dev_dbg(&dev->sbd.core, "%s:%u: command 0x%lx completed\n", __func__,
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__LINE__, cmd);
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return 0;
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}
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EXPORT_SYMBOL_GPL(ps3stor_send_command);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("PS3 Storage Bus Library");
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MODULE_AUTHOR("Sony Corporation");
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