d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Support S/G DMA so that ISA devices (like the floppy disk) work.

Browse Source 
Based on Doug's changes to cia.c

tested by: Matthew Jacob <mjacob@feral.com>
This commit is contained in:
gallatin 1999-08-10 13:30:25 +00:00
parent 2514e13d91
commit 3d3f7ca233
1 changed files with 71 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
sys/alpha/pci/lca.c
View File

@ -23,14 +23,17 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: lca.c,v 1.8 1999/05/10 15:46:38 peter Exp $
* $Id: lca.c,v 1.9 1999/05/20 15:33:23 gallatin Exp $
*/
#include <sys/param.h>
#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>
#include <alpha/pci/lcareg.h>
#include <alpha/pci/lcavar.h>
@ -40,6 +43,11 @@
#include <machine/resource.h>
#include <machine/cpuconf.h>
#include <machine/swiz.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)
@ -363,6 +371,67 @@ static driver_t lca_driver = {
sizeof(struct lca_softc),
};
#define LCA_SGMAP_BASE (8*1024*1024)
#define LCA_SGMAP_SIZE (8*1024*1024)
static void
lca_sgmap_invalidate(void)
{
alpha_mb();
REGVAL(LCA_IOC_TBIA) = 0;
alpha_mb();
}
static void
lca_sgmap_map(void *arg, vm_offset_t ba, vm_offset_t pa)
{
u_int64_t *sgtable = arg;
int index = alpha_btop(ba - LCA_SGMAP_BASE);
if (pa) {
if (pa > (1L<<32))
panic("lca_sgmap_map: can't map address 0x%lx", pa);
sgtable[index] = ((pa >> 13) << 1) | 1;
} else {
sgtable[index] = 0;
}
alpha_mb();
lca_sgmap_invalidate();
}
static void
lca_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.
*/
REGVAL64(LCA_IOC_W_BASE0) = LCA_SGMAP_BASE |
IOC_W_BASE_SG | IOC_W_BASE_WEN;
alpha_mb();
REGVAL64(LCA_IOC_W_MASK0) = IOC_W_MASK_8M;
alpha_mb();
sgtable = contigmalloc(8192, M_DEVBUF, M_NOWAIT,
0, (1L<<34),
32*1024, (1L<<34));
if (!sgtable)
panic("lca_init_sgmap: can't allocate page table");
chipset.sgmap = sgmap_map_create(LCA_SGMAP_BASE,
LCA_SGMAP_BASE + LCA_SGMAP_SIZE,
lca_sgmap_map, sgtable);
REGVAL64(LCA_IOC_W_T_BASE0) = pmap_kextract((vm_offset_t) sgtable);
alpha_mb();
REGVAL64(LCA_IOC_TB_ENA) = IOC_TB_ENA_TEN;
alpha_mb();
lca_sgmap_invalidate();
}
void
lca_init()
{
@ -390,6 +459,7 @@ lca_probe(device_t dev)
pci_init_resources();
isa_init_intr();
lca_init_sgmap();
device_add_child(dev, "pcib", 0, 0);