[POWERPC] ps3: add ps3 platform system bus support

Adds a PS3 system bus driver.  This system bus is a virtual bus used to present
the PS3 system devices in the LDM.

Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

2 files changed, 359 insertions, 0 deletions

diff --git a/drivers/ps3/Makefile b/drivers/ps3/Makefile
new file mode 100644
index 000000000000..b52d547b7a78
--- /dev/null
+++ b/drivers/ps3/Makefile
@@ -0,0 +1 @@
+obj-y += system-bus.o
diff --git a/drivers/ps3/system-bus.c b/drivers/ps3/system-bus.c
new file mode 100644
index 000000000000..e19992c4db41
--- /dev/null
+++ b/drivers/ps3/system-bus.c
@@ -0,0 +1,358 @@
+/*
+ *  PS3 system bus driver.
+ *
+ *  Copyright (C) 2006 Sony Computer Entertainment Inc.
+ *  Copyright 2006 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+
+#include <asm/udbg.h>
+#include <asm/ps3.h>
+#include <asm/lv1call.h>
+
+#define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
+static void _dump_mmio_region(const struct ps3_mmio_region* r,
+        const char* func, int line)
+{
+        pr_debug("%s:%d: dev       %u:%u\n", func, line, r->did.bus_id,
+                r->did.dev_id);
+        pr_debug("%s:%d: bus_addr  %lxh\n", func, line, r->bus_addr);
+        pr_debug("%s:%d: len       %lxh\n", func, line, r->len);
+        pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
+}
+
+int ps3_mmio_region_create(struct ps3_mmio_region *r)
+{
+        int result;
+
+        result = lv1_map_device_mmio_region(r->did.bus_id, r->did.dev_id,
+                r->bus_addr, r->len, r->page_size, &r->lpar_addr);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+                r->lpar_addr = r->len = r->bus_addr = 0;
+        }
+
+        dump_mmio_region(r);
+        return result;
+}
+
+int ps3_free_mmio_region(struct ps3_mmio_region *r)
+{
+        int result;
+
+        result = lv1_unmap_device_mmio_region(r->did.bus_id, r->did.dev_id,
+                r->bus_addr);
+
+        if (result)
+                pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
+                        __func__, __LINE__, ps3_result(result));
+
+        r->lpar_addr = r->len = r->bus_addr = 0;
+        return result;
+}
+
+static int ps3_system_bus_match(struct device *_dev,
+        struct device_driver *_drv)
+{
+        int result;
+        struct ps3_system_bus_driver *drv = to_ps3_system_bus_driver(_drv);
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+
+        result = dev->match_id == drv->match_id;
+
+        pr_info("%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, __LINE__,
+                dev->match_id, dev->core.bus_id, drv->match_id, drv->core.name,
+                (result ? "match" : "miss"));
+        return result;
+}
+
+static int ps3_system_bus_probe(struct device *_dev)
+{
+        int result;
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+        struct ps3_system_bus_driver *drv =
+                to_ps3_system_bus_driver(_dev->driver);
+
+        result = lv1_open_device(dev->did.bus_id, dev->did.dev_id, 0);
+
+        if (result) {
+                pr_debug("%s:%d: lv1_open_device failed (%d)\n",
+                        __func__, __LINE__, result);
+                result = -EACCES;
+                goto clean_none;
+        }
+
+        if (dev->d_region->did.bus_id) {
+                result = ps3_dma_region_create(dev->d_region);
+
+                if (result) {
+                        pr_debug("%s:%d: ps3_dma_region_create failed (%d)\n",
+                                __func__, __LINE__, result);
+                        BUG_ON("check region type");
+                        result = -EINVAL;
+                        goto clean_device;
+                }
+        }
+
+        BUG_ON(!drv);
+
+        if (drv->probe)
+                result = drv->probe(dev);
+        else
+                pr_info("%s:%d: %s no probe method\n", __func__, __LINE__,
+                        dev->core.bus_id);
+
+        if (result) {
+                pr_debug("%s:%d: drv->probe failed\n", __func__, __LINE__);
+                goto clean_dma;
+        }
+
+        return result;
+
+clean_dma:
+        ps3_dma_region_free(dev->d_region);
+clean_device:
+        lv1_close_device(dev->did.bus_id, dev->did.dev_id);
+clean_none:
+        return result;
+}
+
+static int ps3_system_bus_remove(struct device *_dev)
+{
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+        struct ps3_system_bus_driver *drv =
+                to_ps3_system_bus_driver(_dev->driver);
+
+        if (drv->remove)
+                drv->remove(dev);
+        else
+                pr_info("%s:%d: %s no remove method\n", __func__, __LINE__,
+                        dev->core.bus_id);
+
+        ps3_dma_region_free(dev->d_region);
+        ps3_free_mmio_region(dev->m_region);
+        lv1_close_device(dev->did.bus_id, dev->did.dev_id);
+
+        return 0;
+}
+
+struct bus_type ps3_system_bus_type = {
+        .name = "ps3_system_bus",
+        .match = ps3_system_bus_match,
+        .probe = ps3_system_bus_probe,
+        .remove = ps3_system_bus_remove,
+};
+
+int __init ps3_system_bus_init(void)
+{
+        int result;
+
+        result = bus_register(&ps3_system_bus_type);
+        BUG_ON(result);
+        return result;
+}
+
+core_initcall(ps3_system_bus_init);
+
+/* Allocates a contiguous real buffer and creates mappings over it.
+ * Returns the virtual address of the buffer and sets dma_handle
+ * to the dma address (mapping) of the first page.
+ */
+
+static void * ps3_alloc_coherent(struct device *_dev, size_t size,
+        dma_addr_t *dma_handle, gfp_t flag)
+{
+        int result;
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+        unsigned long virt_addr;
+
+        BUG_ON(!dev->d_region->bus_addr);
+
+        flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
+        flag |= __GFP_ZERO;
+
+        virt_addr = __get_free_pages(flag, get_order(size));
+
+        if (!virt_addr) {
+                pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
+                goto clean_none;
+        }
+
+        result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle);
+
+        if (result) {
+                pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
+                        __func__, __LINE__, result);
+                BUG_ON("check region type");
+                goto clean_alloc;
+        }
+
+        return (void*)virt_addr;
+
+clean_alloc:
+        free_pages(virt_addr, get_order(size));
+clean_none:
+        dma_handle = NULL;
+        return NULL;
+}
+
+static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
+        dma_addr_t dma_handle)
+{
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+
+        ps3_dma_unmap(dev->d_region, dma_handle, size);
+        free_pages((unsigned long)vaddr, get_order(size));
+}
+
+/* Creates TCEs for a user provided buffer.  The user buffer must be
+ * contiguous real kernel storage (not vmalloc).  The address of the buffer
+ * passed here is the kernel (virtual) address of the buffer.  The buffer
+ * need not be page aligned, the dma_addr_t returned will point to the same
+ * byte within the page as vaddr.
+ */
+
+static dma_addr_t ps3_map_single(struct device *_dev, void *ptr, size_t size,
+        enum dma_data_direction direction)
+{
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+        int result;
+        unsigned long bus_addr;
+
+        result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
+                &bus_addr);
+
+        if (result) {
+                pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
+                        __func__, __LINE__, result);
+        }
+
+        return bus_addr;
+}
+
+static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
+        size_t size, enum dma_data_direction direction)
+{
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+        int result;
+
+        result = ps3_dma_unmap(dev->d_region, dma_addr, size);
+
+        if (result) {
+                pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
+                        __func__, __LINE__, result);
+        }
+}
+
+static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
+        enum dma_data_direction direction)
+{
+#if defined(CONFIG_PS3_DYNAMIC_DMA)
+        BUG_ON("do");
+#endif
+        return 0;
+}
+
+static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
+        int nents, enum dma_data_direction direction)
+{
+#if defined(CONFIG_PS3_DYNAMIC_DMA)
+        BUG_ON("do");
+#endif
+}
+
+static int ps3_dma_supported(struct device *_dev, u64 mask)
+{
+        return 1;
+}
+
+static struct dma_mapping_ops ps3_dma_ops = {
+        .alloc_coherent = ps3_alloc_coherent,
+        .free_coherent = ps3_free_coherent,
+        .map_single = ps3_map_single,
+        .unmap_single = ps3_unmap_single,
+        .map_sg = ps3_map_sg,
+        .unmap_sg = ps3_unmap_sg,
+        .dma_supported = ps3_dma_supported
+};
+
+/**
+ * ps3_system_bus_release_device - remove a device from the system bus
+ */
+
+static void ps3_system_bus_release_device(struct device *_dev)
+{
+        struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
+        kfree(dev);
+}
+
+/**
+ * ps3_system_bus_device_register - add a device to the system bus
+ *
+ * ps3_system_bus_device_register() expects the dev object to be allocated
+ * dynamically by the caller.  The system bus takes ownership of the dev
+ * object and frees the object in ps3_system_bus_release_device().
+ */
+
+int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
+{
+        int result;
+        static unsigned int dev_count = 1;
+
+        dev->core.parent = NULL;
+        dev->core.bus = &ps3_system_bus_type;
+        dev->core.release = ps3_system_bus_release_device;
+
+        dev->core.archdata.of_node = NULL;
+        dev->core.archdata.dma_ops = &ps3_dma_ops;
+        dev->core.archdata.numa_node = 0;
+
+        snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "sb_%02x",
+                dev_count++);
+
+        pr_debug("%s:%d add %s\n", __func__, __LINE__, dev->core.bus_id);
+
+        result = device_register(&dev->core);
+        return result;
+}
+
+EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);
+
+int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
+{
+        int result;
+
+        drv->core.bus = &ps3_system_bus_type;
+
+        result = driver_register(&drv->core);
+        return result;
+}
+
+EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);
+
+void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
+{
+        driver_unregister(&drv->core);
+}
+
+EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);