[POWERPC] PS3: Storage Driver Core

Add storage driver core support for the PS3.
PS3 storage devices are a special kind of PS3 system bus device.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 302 insertions, 0 deletions

diff --git a/drivers/ps3/ps3stor_lib.c b/drivers/ps3/ps3stor_lib.c
new file mode 100644
index 000000000000..3a9824e3b251
--- /dev/null
+++ b/drivers/ps3/ps3stor_lib.c
@@ -0,0 +1,302 @@
+/*
+ * 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",
+                         __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");