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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * PS3 Storage Library
0004  *
0005  * Copyright (C) 2007 Sony Computer Entertainment Inc.
0006  * Copyright 2007 Sony Corp.
0007  */
0008 
0009 #include <linux/dma-mapping.h>
0010 #include <linux/module.h>
0011 
0012 #include <asm/lv1call.h>
0013 #include <asm/ps3stor.h>
0014 
0015 /*
0016  * A workaround for flash memory I/O errors when the internal hard disk
0017  * has not been formatted for OtherOS use.  Delay disk close until flash
0018  * memory is closed.
0019  */
0020 
0021 static struct ps3_flash_workaround {
0022     int flash_open;
0023     int disk_open;
0024     struct ps3_system_bus_device *disk_sbd;
0025 } ps3_flash_workaround;
0026 
0027 static int ps3stor_open_hv_device(struct ps3_system_bus_device *sbd)
0028 {
0029     int error = ps3_open_hv_device(sbd);
0030 
0031     if (error)
0032         return error;
0033 
0034     if (sbd->match_id == PS3_MATCH_ID_STOR_FLASH)
0035         ps3_flash_workaround.flash_open = 1;
0036 
0037     if (sbd->match_id == PS3_MATCH_ID_STOR_DISK)
0038         ps3_flash_workaround.disk_open = 1;
0039 
0040     return 0;
0041 }
0042 
0043 static int ps3stor_close_hv_device(struct ps3_system_bus_device *sbd)
0044 {
0045     int error;
0046 
0047     if (sbd->match_id == PS3_MATCH_ID_STOR_DISK
0048         && ps3_flash_workaround.disk_open
0049         && ps3_flash_workaround.flash_open) {
0050         ps3_flash_workaround.disk_sbd = sbd;
0051         return 0;
0052     }
0053 
0054     error = ps3_close_hv_device(sbd);
0055 
0056     if (error)
0057         return error;
0058 
0059     if (sbd->match_id == PS3_MATCH_ID_STOR_DISK)
0060         ps3_flash_workaround.disk_open = 0;
0061 
0062     if (sbd->match_id == PS3_MATCH_ID_STOR_FLASH) {
0063         ps3_flash_workaround.flash_open = 0;
0064 
0065         if (ps3_flash_workaround.disk_sbd) {
0066             ps3_close_hv_device(ps3_flash_workaround.disk_sbd);
0067             ps3_flash_workaround.disk_open = 0;
0068             ps3_flash_workaround.disk_sbd = NULL;
0069         }
0070     }
0071 
0072     return 0;
0073 }
0074 
0075 static int ps3stor_probe_access(struct ps3_storage_device *dev)
0076 {
0077     int res, error;
0078     unsigned int i;
0079     unsigned long n;
0080 
0081     if (dev->sbd.match_id == PS3_MATCH_ID_STOR_ROM) {
0082         /* special case: CD-ROM is assumed always accessible */
0083         dev->accessible_regions = 1;
0084         return 0;
0085     }
0086 
0087     error = -EPERM;
0088     for (i = 0; i < dev->num_regions; i++) {
0089         dev_dbg(&dev->sbd.core,
0090             "%s:%u: checking accessibility of region %u\n",
0091             __func__, __LINE__, i);
0092 
0093         dev->region_idx = i;
0094         res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, 0, 1,
0095                          0);
0096         if (res) {
0097             dev_dbg(&dev->sbd.core, "%s:%u: read failed, "
0098                 "region %u is not accessible\n", __func__,
0099                 __LINE__, i);
0100             continue;
0101         }
0102 
0103         dev_dbg(&dev->sbd.core, "%s:%u: region %u is accessible\n",
0104             __func__, __LINE__, i);
0105         set_bit(i, &dev->accessible_regions);
0106 
0107         /* We can access at least one region */
0108         error = 0;
0109     }
0110     if (error)
0111         return error;
0112 
0113     n = hweight_long(dev->accessible_regions);
0114     if (n > 1)
0115         dev_info(&dev->sbd.core,
0116              "%s:%u: %lu accessible regions found. Only the first "
0117              "one will be used\n",
0118              __func__, __LINE__, n);
0119     dev->region_idx = __ffs(dev->accessible_regions);
0120     dev_info(&dev->sbd.core,
0121          "First accessible region has index %u start %llu size %llu\n",
0122          dev->region_idx, dev->regions[dev->region_idx].start,
0123          dev->regions[dev->region_idx].size);
0124 
0125     return 0;
0126 }
0127 
0128 
0129 /**
0130  *  ps3stor_setup - Setup a storage device before use
0131  *  @dev: Pointer to a struct ps3_storage_device
0132  *  @handler: Pointer to an interrupt handler
0133  *
0134  *  Returns 0 for success, or an error code
0135  */
0136 int ps3stor_setup(struct ps3_storage_device *dev, irq_handler_t handler)
0137 {
0138     int error, res, alignment;
0139     enum ps3_dma_page_size page_size;
0140 
0141     error = ps3stor_open_hv_device(&dev->sbd);
0142     if (error) {
0143         dev_err(&dev->sbd.core,
0144             "%s:%u: ps3_open_hv_device failed %d\n", __func__,
0145             __LINE__, error);
0146         goto fail;
0147     }
0148 
0149     error = ps3_sb_event_receive_port_setup(&dev->sbd, PS3_BINDING_CPU_ANY,
0150                         &dev->irq);
0151     if (error) {
0152         dev_err(&dev->sbd.core,
0153             "%s:%u: ps3_sb_event_receive_port_setup failed %d\n",
0154                __func__, __LINE__, error);
0155         goto fail_close_device;
0156     }
0157 
0158     error = request_irq(dev->irq, handler, 0,
0159                 dev->sbd.core.driver->name, dev);
0160     if (error) {
0161         dev_err(&dev->sbd.core, "%s:%u: request_irq failed %d\n",
0162             __func__, __LINE__, error);
0163         goto fail_sb_event_receive_port_destroy;
0164     }
0165 
0166     alignment = min(__ffs(dev->bounce_size),
0167             __ffs((unsigned long)dev->bounce_buf));
0168     if (alignment < 12) {
0169         dev_err(&dev->sbd.core,
0170             "%s:%u: bounce buffer not aligned (%lx at 0x%p)\n",
0171             __func__, __LINE__, dev->bounce_size, dev->bounce_buf);
0172         error = -EINVAL;
0173         goto fail_free_irq;
0174     } else if (alignment < 16)
0175         page_size = PS3_DMA_4K;
0176     else
0177         page_size = PS3_DMA_64K;
0178     dev->sbd.d_region = &dev->dma_region;
0179     ps3_dma_region_init(&dev->sbd, &dev->dma_region, page_size,
0180                 PS3_DMA_OTHER, dev->bounce_buf, dev->bounce_size);
0181     res = ps3_dma_region_create(&dev->dma_region);
0182     if (res) {
0183         dev_err(&dev->sbd.core, "%s:%u: cannot create DMA region\n",
0184             __func__, __LINE__);
0185         error = -ENOMEM;
0186         goto fail_free_irq;
0187     }
0188 
0189     dev->bounce_lpar = ps3_mm_phys_to_lpar(__pa(dev->bounce_buf));
0190     dev->bounce_dma = dma_map_single(&dev->sbd.core, dev->bounce_buf,
0191                      dev->bounce_size, DMA_BIDIRECTIONAL);
0192     if (dma_mapping_error(&dev->sbd.core, dev->bounce_dma)) {
0193         dev_err(&dev->sbd.core, "%s:%u: map DMA region failed\n",
0194             __func__, __LINE__);
0195         error = -ENODEV;
0196         goto fail_free_dma;
0197     }
0198 
0199     error = ps3stor_probe_access(dev);
0200     if (error) {
0201         dev_err(&dev->sbd.core, "%s:%u: No accessible regions found\n",
0202             __func__, __LINE__);
0203         goto fail_unmap_dma;
0204     }
0205     return 0;
0206 
0207 fail_unmap_dma:
0208     dma_unmap_single(&dev->sbd.core, dev->bounce_dma, dev->bounce_size,
0209              DMA_BIDIRECTIONAL);
0210 fail_free_dma:
0211     ps3_dma_region_free(&dev->dma_region);
0212 fail_free_irq:
0213     free_irq(dev->irq, dev);
0214 fail_sb_event_receive_port_destroy:
0215     ps3_sb_event_receive_port_destroy(&dev->sbd, dev->irq);
0216 fail_close_device:
0217     ps3stor_close_hv_device(&dev->sbd);
0218 fail:
0219     return error;
0220 }
0221 EXPORT_SYMBOL_GPL(ps3stor_setup);
0222 
0223 
0224 /**
0225  *  ps3stor_teardown - Tear down a storage device after use
0226  *  @dev: Pointer to a struct ps3_storage_device
0227  */
0228 void ps3stor_teardown(struct ps3_storage_device *dev)
0229 {
0230     int error;
0231 
0232     dma_unmap_single(&dev->sbd.core, dev->bounce_dma, dev->bounce_size,
0233              DMA_BIDIRECTIONAL);
0234     ps3_dma_region_free(&dev->dma_region);
0235 
0236     free_irq(dev->irq, dev);
0237 
0238     error = ps3_sb_event_receive_port_destroy(&dev->sbd, dev->irq);
0239     if (error)
0240         dev_err(&dev->sbd.core,
0241             "%s:%u: destroy event receive port failed %d\n",
0242             __func__, __LINE__, error);
0243 
0244     error = ps3stor_close_hv_device(&dev->sbd);
0245     if (error)
0246         dev_err(&dev->sbd.core,
0247             "%s:%u: ps3_close_hv_device failed %d\n", __func__,
0248             __LINE__, error);
0249 }
0250 EXPORT_SYMBOL_GPL(ps3stor_teardown);
0251 
0252 
0253 /**
0254  *  ps3stor_read_write_sectors - read/write from/to a storage device
0255  *  @dev: Pointer to a struct ps3_storage_device
0256  *  @lpar: HV logical partition address
0257  *  @start_sector: First sector to read/write
0258  *  @sectors: Number of sectors to read/write
0259  *  @write: Flag indicating write (non-zero) or read (zero)
0260  *
0261  *  Returns 0 for success, -1 in case of failure to submit the command, or
0262  *  an LV1 status value in case of other errors
0263  */
0264 u64 ps3stor_read_write_sectors(struct ps3_storage_device *dev, u64 lpar,
0265                    u64 start_sector, u64 sectors, int write)
0266 {
0267     unsigned int region_id = dev->regions[dev->region_idx].id;
0268     const char *op = write ? "write" : "read";
0269     int res;
0270 
0271     dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
0272         __func__, __LINE__, op, sectors, start_sector);
0273 
0274     init_completion(&dev->done);
0275     res = write ? lv1_storage_write(dev->sbd.dev_id, region_id,
0276                     start_sector, sectors, 0, lpar,
0277                     &dev->tag)
0278             : lv1_storage_read(dev->sbd.dev_id, region_id,
0279                        start_sector, sectors, 0, lpar,
0280                        &dev->tag);
0281     if (res) {
0282         dev_dbg(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
0283             __LINE__, op, res);
0284         return -1;
0285     }
0286 
0287     wait_for_completion(&dev->done);
0288     if (dev->lv1_status) {
0289         dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
0290             __LINE__, op, dev->lv1_status);
0291         return dev->lv1_status;
0292     }
0293 
0294     dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__, __LINE__,
0295         op);
0296 
0297     return 0;
0298 }
0299 EXPORT_SYMBOL_GPL(ps3stor_read_write_sectors);
0300 
0301 
0302 /**
0303  *  ps3stor_send_command - send a device command to a storage device
0304  *  @dev: Pointer to a struct ps3_storage_device
0305  *  @cmd: Command number
0306  *  @arg1: First command argument
0307  *  @arg2: Second command argument
0308  *  @arg3: Third command argument
0309  *  @arg4: Fourth command argument
0310  *
0311  *  Returns 0 for success, -1 in case of failure to submit the command, or
0312  *  an LV1 status value in case of other errors
0313  */
0314 u64 ps3stor_send_command(struct ps3_storage_device *dev, u64 cmd, u64 arg1,
0315              u64 arg2, u64 arg3, u64 arg4)
0316 {
0317     int res;
0318 
0319     dev_dbg(&dev->sbd.core, "%s:%u: send device command 0x%llx\n", __func__,
0320         __LINE__, cmd);
0321 
0322     init_completion(&dev->done);
0323 
0324     res = lv1_storage_send_device_command(dev->sbd.dev_id, cmd, arg1,
0325                           arg2, arg3, arg4, &dev->tag);
0326     if (res) {
0327         dev_err(&dev->sbd.core,
0328             "%s:%u: send_device_command 0x%llx failed %d\n",
0329             __func__, __LINE__, cmd, res);
0330         return -1;
0331     }
0332 
0333     wait_for_completion(&dev->done);
0334     if (dev->lv1_status) {
0335         dev_dbg(&dev->sbd.core, "%s:%u: command 0x%llx failed 0x%llx\n",
0336             __func__, __LINE__, cmd, dev->lv1_status);
0337         return dev->lv1_status;
0338     }
0339 
0340     dev_dbg(&dev->sbd.core, "%s:%u: command 0x%llx completed\n", __func__,
0341         __LINE__, cmd);
0342 
0343     return 0;
0344 }
0345 EXPORT_SYMBOL_GPL(ps3stor_send_command);
0346 
0347 
0348 MODULE_LICENSE("GPL");
0349 MODULE_DESCRIPTION("PS3 Storage Bus Library");
0350 MODULE_AUTHOR("Sony Corporation");
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