1 files changed, 126 insertions, 0 deletions
diff --git a/arch/sh/cchips/voyagergx/consistent.c b/arch/sh/cchips/voyagergx/consistent.c
new file mode 100644
index 00000000000..5b92585a38d
--- /dev/null
+++ b/arch/sh/cchips/voyagergx/consistent.c
@@ -0,0 +1,126 @@
+/*
+ * arch/sh/cchips/voyagergx/consistent.c
+ *
+ * Copyright (C) 2004  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <asm/io.h>
+#include <asm/bus-sh.h>
+
+struct voya_alloc_entry {
+	struct list_head list;
+	unsigned long ofs;
+	unsigned long len;
+};
+
+static DEFINE_SPINLOCK(voya_list_lock);
+static LIST_HEAD(voya_alloc_list);
+
+#define OHCI_SRAM_START	0xb0000000
+#define OHCI_HCCA_SIZE	0x100
+#define OHCI_SRAM_SIZE	0x10000
+
+void *voyagergx_consistent_alloc(struct device *dev, size_t size,
+				 dma_addr_t *handle, int flag)
+{
+	struct list_head *list = &voya_alloc_list;
+	struct voya_alloc_entry *entry;
+	struct sh_dev *shdev = to_sh_dev(dev);
+	unsigned long start, end;
+	unsigned long flags;
+
+	/*
+	 * The SM501 contains an integrated 8051 with its own SRAM.
+	 * Devices within the cchip can all hook into the 8051 SRAM.
+	 * We presently use this for the OHCI.
+	 *
+	 * Everything else goes through consistent_alloc().
+	 */
+	if (!dev || dev->bus != &sh_bus_types[SH_BUS_VIRT] ||
+		   (dev->bus == &sh_bus_types[SH_BUS_VIRT] &&
+		    shdev->dev_id != SH_DEV_ID_USB_OHCI))
+		return NULL;
+
+	start = OHCI_SRAM_START + OHCI_HCCA_SIZE;
+
+	entry = kmalloc(sizeof(struct voya_alloc_entry), GFP_ATOMIC);
+	if (!entry)
+		return ERR_PTR(-ENOMEM);
+
+	entry->len = (size + 15) & ~15;
+
+	/*
+	 * The basis for this allocator is dwmw2's malloc.. the
+	 * Matrox allocator :-)
+	 */
+	spin_lock_irqsave(&voya_list_lock, flags);
+	list_for_each(list, &voya_alloc_list) {
+		struct voya_alloc_entry *p;
+
+		p = list_entry(list, struct voya_alloc_entry, list);
+
+		if (p->ofs - start >= size)
+			goto out;
+
+		start = p->ofs + p->len;
+	}
+
+	end  = start + (OHCI_SRAM_SIZE  - OHCI_HCCA_SIZE);
+	list = &voya_alloc_list;
+
+	if (end - start >= size) {
+out:
+		entry->ofs = start;
+		list_add_tail(&entry->list, list);
+		spin_unlock_irqrestore(&voya_list_lock, flags);
+
+		*handle = start;
+		return (void *)start;
+	}
+
+	kfree(entry);
+	spin_unlock_irqrestore(&voya_list_lock, flags);
+
+	return ERR_PTR(-EINVAL);
+}
+
+int voyagergx_consistent_free(struct device *dev, size_t size,
+			      void *vaddr, dma_addr_t handle)
+{
+	struct voya_alloc_entry *entry;
+	struct sh_dev *shdev = to_sh_dev(dev);
+	unsigned long flags;
+
+	if (!dev || dev->bus != &sh_bus_types[SH_BUS_VIRT] ||
+		   (dev->bus == &sh_bus_types[SH_BUS_VIRT] &&
+		    shdev->dev_id != SH_DEV_ID_USB_OHCI))
+		return -EINVAL;
+
+	spin_lock_irqsave(&voya_list_lock, flags);
+	list_for_each_entry(entry, &voya_alloc_list, list) {
+		if (entry->ofs != handle)
+			continue;
+
+		list_del(&entry->list);
+		kfree(entry);
+
+		break;
+	}
+	spin_unlock_irqrestore(&voya_list_lock, flags);
+
+	return 0;
+}
+
+EXPORT_SYMBOL(voyagergx_consistent_alloc);
+EXPORT_SYMBOL(voyagergx_consistent_free);
+