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NetBSD/sys/arch/arm/iomd/iomd_dma.c

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/* $NetBSD: iomd_dma.c,v 1.10 2006/08/05 18:22:57 bjh21 Exp $ */
/*
* Copyright (c) 1995 Scott Stevens
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Scott Stevens.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* RiscBSD kernel project
*
* dma.c
*
* Created : 15/03/97
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: iomd_dma.c,v 1.10 2006/08/05 18:22:57 bjh21 Exp $");
#define DMA_DEBUG
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <uvm/uvm_extern.h>
#include <machine/intr.h>
#include <machine/pmap.h>
#include <arm/iomd/iomdreg.h>
#include <arm/iomd/iomdvar.h>
#include <arm/iomd/iomd_dma.h>
/*
* Only for non ARM7500 machines but the kernel could be booted on a
* different machine
*/
static struct dma_ctrl ctrl[6];
void dma_dumpdc(struct dma_ctrl *);
void
dma_go(struct dma_ctrl *dp)
{
#ifdef DMA_DEBUG
printf("dma_go()\n");
#endif
if (dp->dc_flags & DMA_FL_READY) {
dp->dc_flags = DMA_FL_ACTIVE;
enable_irq(IRQ_DMACH0 + dp->dc_channel);
} else
panic("dma not ready");
}
int
dma_reset(struct dma_ctrl *dp)
{
#ifdef DMA_DEBUG
printf("dma_reset()\n");
dma_dumpdc(dp);
#endif
*dp->dc_cr = DMA_CR_CLEAR;
dp->dc_flags = 0;
disable_irq(IRQ_DMACH0 + dp->dc_channel);
return 0;
}
/*
* Setup dma transfer, prior to the dma_go call
*/
int
dma_setup(struct dma_ctrl *dp, u_char *start, int len, int readp)
{
#ifdef DMA_DEBUG
printf("dma_setup(start = %p, len = 0x%08x, readp = %d\n",
start, len, readp);
#endif
if (((u_int)start & (dp->dc_dmasize - 1)) ||
(len & (dp->dc_dmasize - 1))) {
printf("dma_setup: unaligned DMA, %p (0x%08x)\n",
start, len);
}
*dp->dc_cr = DMA_CR_CLEAR | DMA_CR_ENABLE | (readp?DMA_CR_DIR:0) |
dp->dc_dmasize;
*dp->dc_cr = DMA_CR_ENABLE | (readp?DMA_CR_DIR:0) | dp->dc_dmasize;
dp->dc_nextaddr = start;
dp->dc_len = len;
dp->dc_flags = DMA_FL_READY;
return 0;
}
/*
* return true if DMA is active
*/
int
dma_isactive(struct dma_ctrl *dp)
{
return dp->dc_flags & DMA_FL_ACTIVE;
}
/*
* return true if interrupt pending
*/
int
dma_isintr(struct dma_ctrl *dp)
{
#ifdef DMA_DEBUG
/* printf("dma_isintr() returning %d\n", *dp->dc_st & DMA_ST_INT);*/
#endif
return *dp->dc_st & DMA_ST_INT;
}
int
dma_intr(void *cookie)
{
struct dma_ctrl *dp = cookie;
u_char status = (*dp->dc_st) & DMA_ST_MASK;
paddr_t cur;
int len;
int bufap = 0;
#ifdef DMA_DEBUG
printf("dma_intr() status = 0x%02x\n", status);
#endif
if (!(dp->dc_flags & DMA_FL_ACTIVE)) {
/* interrupt whilst not active */
/* ie. last buffer programmed */
dma_reset(dp);
return 0;
}
switch (status) {
case DMA_ST_OVER | DMA_ST_INT:
case DMA_ST_OVER | DMA_ST_INT | DMA_ST_CHAN:
/* idle, either first buffer or finished */
if (status & DMA_ST_CHAN) {
/* fill buffer B */
bufap = 0;
goto fill;
}
else {
/* fill buffer A */
bufap = 1;
goto fill;
}
break;
case DMA_ST_INT:
case DMA_ST_INT | DMA_ST_CHAN:
/* buffer ready */
if (status & DMA_ST_CHAN) {
/* fill buffer A */
bufap = 1;
goto fill;
}
else {
/* fill buffer B */
bufap = 0;
goto fill;
}
break;
default:
/* Shouldn't be here */
#ifdef DMA_DEBUG
printf("DMA ch %d bad status [%x]\n", dp->dc_channel, status);
dma_dumpdc(dp);
#endif
break;
}
/* return(0);*/
/* XXX */
#define PHYS(x, y) pmap_extract(pmap_kernel(), (vaddr_t)x, (paddr_t *)(y))
fill:
#ifdef DMA_DEBUG
printf("fill:\n");
#endif
if (dp->dc_len == 0) goto done;
PHYS(dp->dc_nextaddr, &cur);
len = PAGE_SIZE - (cur & PGOFSET);
if (len > dp->dc_len) {
/* Last buffer */
len = dp->dc_len;
}
#ifdef DMA_DEBUG
dma_dumpdc(dp);
/* ptsc_dump_mem(dp->dc_nextaddr, len);*/
#endif
/*
* Flush the cache for this address
*/
cpu_dcache_wbinv_range((vaddr_t)dp->dc_nextaddr, len);
dp->dc_nextaddr += len;
dp->dc_len -= len;
if (bufap) {
*dp->dc_cura = (u_int)cur;
*dp->dc_enda = ((u_int)cur + len - dp->dc_dmasize) |
(dp->dc_len == 0 ? DMA_END_STOP : 0);
if (dp->dc_len == 0) {
/* Last buffer, fill other buffer with garbage */
*dp->dc_endb = (u_int)cur;
}
} else {
*dp->dc_curb = (u_int)cur;
*dp->dc_endb = ((u_int)cur + len - dp->dc_dmasize) |
(dp->dc_len == 0 ? DMA_END_STOP : 0);
if (dp->dc_len == 0) {
/* Last buffer, fill other buffer with garbage */
*dp->dc_enda = (u_int)cur;
}
}
#ifdef DMA_DEBUG
dma_dumpdc(dp);
/* ptsc_dump_mem(dp->dc_nextaddr - len, len);*/
printf("about to return\n");
#endif
return 1;
done:
#ifdef DMA_DEBUG
printf("done:\n");
#endif
dp->dc_flags = 0;
*dp->dc_cr = 0;
disable_irq(IRQ_DMACH0 + dp->dc_channel);
#ifdef DMA_DEBUG
printf("about to return\n");
#endif
return 1;
}
void
dma_dumpdc(struct dma_ctrl *dc)
{
printf("\ndc:\t%p\n"
"dc_channel:\t%p=0x%08x\tdc_flags:\t%p=0x%08x\n"
"dc_cura:\t%p=0x%08x\tdc_enda:\t%p=0x%08x\n"
"dc_curb:\t%p=0x%08x\tdc_endb:\t%p=0x%08x\n"
"dc_cr:\t%p=0x%02x\t\tdc_st:\t%p=0x%02x\n"
"dc_nextaddr:\t%p=0x%08x\tdc_len:\t%p=0x%08x\n",
dc,
&dc->dc_channel, (int)dc->dc_channel,
&dc->dc_flags, (int)dc->dc_flags,
dc->dc_cura, (int)*dc->dc_cura,
dc->dc_enda, (int)*dc->dc_enda,
dc->dc_curb, (int)*dc->dc_curb,
dc->dc_endb, (int)*dc->dc_endb,
dc->dc_cr, (int)*dc->dc_cr,
dc->dc_st, (int)(*dc->dc_st) & DMA_ST_MASK,
&dc->dc_nextaddr, (int)dc->dc_nextaddr,
&dc->dc_len, dc->dc_len);
}
struct dma_ctrl *
dma_init(int ch, int extp, int dmasize, int ipl)
{
struct dma_ctrl *dp = &ctrl[ch];
int offset = ch * 0x20;
volatile u_char *dmaext = (volatile u_char *)(IOMD_ADDRESS(IOMD_DMAEXT));
printf("Initialising DMA channel %d\n", ch);
dp->dc_channel = ch;
dp->dc_flags = 0;
dp->dc_dmasize = dmasize;
dp->dc_cura = (volatile u_int *)(IOMD_ADDRESS(IOMD_IO0CURA) + offset);
dp->dc_enda = (volatile u_int *)(IOMD_ADDRESS(IOMD_IO0ENDA) + offset);
dp->dc_curb = (volatile u_int *)(IOMD_ADDRESS(IOMD_IO0CURB) + offset);
dp->dc_endb = (volatile u_int *)(IOMD_ADDRESS(IOMD_IO0ENDB) + offset);
dp->dc_cr = (volatile u_char *)(IOMD_ADDRESS(IOMD_IO0CR) + offset);
dp->dc_st = (volatile u_char *)(IOMD_ADDRESS(IOMD_IO0ST) + offset);
if (extp)
*dmaext |= (1 << ch);
printf("about to claim interrupt\n");
dp->dc_ih.ih_func = dma_intr;
dp->dc_ih.ih_arg = dp;
dp->dc_ih.ih_level = ipl;
dp->dc_ih.ih_name = "dma";
dp->dc_ih.ih_maskaddr = (u_int) IOMD_ADDRESS(IOMD_DMARQ);
dp->dc_ih.ih_maskbits = (1 << ch);
if (irq_claim(IRQ_DMACH0 + ch, &dp->dc_ih))
panic("Cannot install DMA IRQ handler");
return dp;
}
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