203 lines
5.1 KiB
C
Executable File
203 lines
5.1 KiB
C
Executable File
/*
|
|
* ccio-rm-dma.c:
|
|
* DMA management routines for first generation cache-coherent machines.
|
|
* "Real Mode" operation refers to U2/Uturn chip operation. The chip
|
|
* can perform coherency checks w/o using the I/O MMU. That's all we
|
|
* need until support for more than 4GB phys mem is needed.
|
|
*
|
|
* This is the trivial case - basically what x86 does.
|
|
*
|
|
* Drawbacks of using Real Mode are:
|
|
* o outbound DMA is slower since one isn't using the prefetching
|
|
* U2 can do for outbound DMA.
|
|
* o Ability to do scatter/gather in HW is also lost.
|
|
* o only known to work with PCX-W processor. (eg C360)
|
|
* (PCX-U/U+ are not coherent with U2 in real mode.)
|
|
*
|
|
*
|
|
* 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
*
|
|
* Original version/author:
|
|
* CVSROOT=:pserver:anonymous@198.186.203.37:/cvsroot/linux-parisc
|
|
* cvs -z3 co linux/arch/parisc/kernel/dma-rm.c
|
|
*
|
|
* (C) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
|
|
*
|
|
*
|
|
* Adopted for The Puffin Group's parisc-linux port by Grant Grundler.
|
|
* (C) Copyright 2000 Grant Grundler <grundler@puffin.external.hp.com>
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/string.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/gfp.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/hardware.h>
|
|
#include <asm/page.h>
|
|
|
|
/* Only chose "ccio" since that's what HP-UX calls it....
|
|
** Make it easier for folks to migrate from one to the other :^)
|
|
*/
|
|
#define MODULE_NAME "ccio"
|
|
|
|
#define U2_IOA_RUNWAY 0x580
|
|
#define U2_BC_GSC 0x501
|
|
#define UTURN_IOA_RUNWAY 0x581
|
|
#define UTURN_BC_GSC 0x502
|
|
|
|
#define IS_U2(id) ( \
|
|
(((id)->hw_type == HPHW_IOA) && ((id)->hversion == U2_IOA_RUNWAY)) || \
|
|
(((id)->hw_type == HPHW_BCPORT) && ((id)->hversion == U2_BC_GSC)) \
|
|
)
|
|
|
|
#define IS_UTURN(id) ( \
|
|
(((id)->hw_type == HPHW_IOA) && ((id)->hversion == UTURN_IOA_RUNWAY)) || \
|
|
(((id)->hw_type == HPHW_BCPORT) && ((id)->hversion == UTURN_BC_GSC)) \
|
|
)
|
|
|
|
static int ccio_dma_supported( struct pci_dev *dev, u64 mask)
|
|
{
|
|
if (dev == NULL) {
|
|
printk(KERN_ERR MODULE_NAME ": EISA/ISA/et al not supported\n");
|
|
BUG();
|
|
return(0);
|
|
}
|
|
|
|
/* only support 32-bit devices (ie PCI/GSC) */
|
|
return((int) (mask >= 0xffffffffUL));
|
|
}
|
|
|
|
|
|
static void *ccio_alloc_consistent(struct pci_dev *dev, size_t size,
|
|
dma_addr_t *handle)
|
|
{
|
|
void *ret;
|
|
|
|
ret = (void *)__get_free_pages(GFP_ATOMIC, get_order(size));
|
|
|
|
if (ret != NULL) {
|
|
memset(ret, 0, size);
|
|
*handle = virt_to_phys(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void ccio_free_consistent(struct pci_dev *dev, size_t size,
|
|
void *vaddr, dma_addr_t handle)
|
|
{
|
|
free_pages((unsigned long)vaddr, get_order(size));
|
|
}
|
|
|
|
static dma_addr_t ccio_map_single(struct pci_dev *dev, void *ptr, size_t size,
|
|
int direction)
|
|
{
|
|
return virt_to_phys(ptr);
|
|
}
|
|
|
|
static void ccio_unmap_single(struct pci_dev *dev, dma_addr_t dma_addr,
|
|
size_t size, int direction)
|
|
{
|
|
/* Nothing to do */
|
|
}
|
|
|
|
|
|
static int ccio_map_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
|
|
{
|
|
int tmp = nents;
|
|
|
|
/* KISS: map each buffer separately. */
|
|
while (nents) {
|
|
sg_dma_address(sglist) = ccio_map_single(dev, sglist->address, sglist->length, direction);
|
|
sg_dma_len(sglist) = sglist->length;
|
|
nents--;
|
|
sglist++;
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
|
|
|
|
static void ccio_unmap_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
|
|
{
|
|
#if 0
|
|
while (nents) {
|
|
ccio_unmap_single(dev, sg_dma_address(sglist), sg_dma_len(sglist), direction);
|
|
nents--;
|
|
sglist++;
|
|
}
|
|
return;
|
|
#else
|
|
/* Do nothing (copied from current ccio_unmap_single() :^) */
|
|
#endif
|
|
}
|
|
|
|
|
|
static struct pci_dma_ops ccio_ops = {
|
|
ccio_dma_supported,
|
|
ccio_alloc_consistent,
|
|
ccio_free_consistent,
|
|
ccio_map_single,
|
|
ccio_unmap_single,
|
|
ccio_map_sg,
|
|
ccio_unmap_sg,
|
|
NULL, /* dma_sync_single_for_cpu : NOP for U2 */
|
|
NULL, /* dma_sync_single_for_device : NOP for U2 */
|
|
NULL, /* dma_sync_sg_for_cpu : ditto */
|
|
NULL, /* dma_sync_sg_for_device : ditto */
|
|
};
|
|
|
|
|
|
/*
|
|
** Determine if u2 should claim this chip (return 0) or not (return 1).
|
|
** If so, initialize the chip and tell other partners in crime they
|
|
** have work to do.
|
|
*/
|
|
static int
|
|
ccio_probe(struct parisc_device *dev)
|
|
{
|
|
printk(KERN_INFO "%s found %s at 0x%lx\n", MODULE_NAME,
|
|
dev->id.hversion == U2_BC_GSC ? "U2" : "UTurn",
|
|
dev->hpa.start);
|
|
|
|
/*
|
|
** FIXME - should check U2 registers to verify it's really running
|
|
** in "Real Mode".
|
|
*/
|
|
|
|
#if 0
|
|
/* will need this for "Virtual Mode" operation */
|
|
ccio_hw_init(ccio_dev);
|
|
ccio_common_init(ccio_dev);
|
|
#endif
|
|
hppa_dma_ops = &ccio_ops;
|
|
return 0;
|
|
}
|
|
|
|
static struct parisc_device_id ccio_tbl[] = {
|
|
{ HPHW_BCPORT, HVERSION_REV_ANY_ID, U2_BC_GSC, 0xc },
|
|
{ HPHW_BCPORT, HVERSION_REV_ANY_ID, UTURN_BC_GSC, 0xc },
|
|
{ 0, }
|
|
};
|
|
|
|
static struct parisc_driver ccio_driver = {
|
|
.name = "U2/Uturn",
|
|
.id_table = ccio_tbl,
|
|
.probe = ccio_probe,
|
|
};
|
|
|
|
void __init ccio_init(void)
|
|
{
|
|
register_parisc_driver(&ccio_driver);
|
|
}
|