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