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Enable S/G IO. Based on Doug's changes to cia.c

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This commit is contained in:
Andrew Gallatin 1999-08-11 22:31:01 +00:00
parent 6d6189a455
commit 7f146cdf3d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=49643
1 changed files with 65 additions and 1 deletions
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66
sys/alpha/pci/apecs.c
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@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: apecs.c,v 1.7 1999/05/08 21:58:40 dfr Exp $
* $Id: apecs.c,v 1.8 1999/05/20 15:33:18 gallatin Exp $
*/
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
@ -59,6 +59,7 @@
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
@ -73,6 +74,11 @@
#include <machine/cpuconf.h>
#include <machine/swiz.h>
#include <machine/rpb.h>
#include <machine/sgmap.h>
#include <vm/vm.h>
#include <vm/vm_prot.h>
#include <vm/vm_page.h>
#define KV(pa) ALPHA_PHYS_TO_K0SEG(pa)
@ -478,6 +484,63 @@ static driver_t apecs_driver = {
sizeof(struct apecs_softc),
};
#define APECS_SGMAP_BASE (8*1024*1024)
#define APECS_SGMAP_SIZE (8*1024*1024)
static void
apecs_sgmap_invalidate(void)
{
alpha_mb();
REGVAL(EPIC_TBIA) = 0;
alpha_mb();
}
static void
apecs_sgmap_map(void *arg, vm_offset_t ba, vm_offset_t pa)
{
u_int64_t *sgtable = arg;
int index = alpha_btop(ba - APECS_SGMAP_BASE);
if (pa) {
if (pa > (1L<<32))
panic("apecs_sgmap_map: can't map address 0x%lx", pa);
sgtable[index] = ((pa >> 13) << 1) | 1;
} else {
sgtable[index] = 0;
}
alpha_mb();
apecs_sgmap_invalidate();
}
static void
apecs_init_sgmap(void)
{
void *sgtable;
/*
* First setup Window 0 to map 8Mb to 16Mb with an
* sgmap. Allocate the map aligned to a 32 boundary.
*/
REGVAL(EPIC_PCI_BASE_1) = APECS_SGMAP_BASE |
EPIC_PCI_BASE_SGEN | EPIC_PCI_BASE_WENB;
alpha_mb();
REGVAL(EPIC_PCI_MASK_1) = EPIC_PCI_MASK_8M;
alpha_mb();
sgtable = contigmalloc(8192, M_DEVBUF, M_NOWAIT,
0, (1L<<34),
32*1024, (1L<<34));
if (!sgtable)
panic("apecs_init_sgmap: can't allocate page table");
REGVAL(EPIC_TBASE_1) =
(pmap_kextract((vm_offset_t) sgtable) >> EPIC_TBASE_SHIFT);
chipset.sgmap = sgmap_map_create(APECS_SGMAP_BASE,
APECS_SGMAP_BASE + APECS_SGMAP_SIZE,
apecs_sgmap_map, sgtable);
}
void
apecs_init()
{
@ -509,6 +572,7 @@ apecs_probe(device_t dev)
pci_init_resources();
isa_init_intr();
apecs_init_sgmap();
device_add_child(dev, "pcib", 0, 0);