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Move DMA chip draining to dmaintr() and drain when a (possibly partial) 

transfer ends in stead of doing it before starting a new transfer.
Use a different CSR bit to wait for "chip not busy" (may be necessary to
make this conditional on chip revision).
This commit is contained in:
pk 1995-10-24 16:26:54 +00:00
parent a3f2bf19e4
commit e4fcc8ab5a
1 changed files with 9 additions and 10 deletions
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19
sys/arch/sparc/dev/dma.c
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@ -1,4 +1,4 @@
/* $NetBSD: dma.c,v 1.10 1995/08/18 10:43:49 pk Exp $ */
/* $NetBSD: dma.c,v 1.11 1995/10/24 16:26:54 pk Exp $ */
/*
* Copyright (c) 1994 Peter Galbavy. All rights reserved.
@ -233,7 +233,6 @@ dma_isintr(sc)
(16 * 1024 * 1024) : (64 * 1024))
#define DMAMAX(a) (0x01000000 - ((a) & 0x00ffffff))
/*!!!*/int xdmadebug = 0;
/*
* start a dma transfer or keep it going
*/
@ -272,12 +271,6 @@ dma_start(sc, addr, len, datain)
/* load the count in */
ESPCMD(sc->sc_esp, ESPCMD_NOP|ESPCMD_DMA);
DMAWAIT1(sc);
/* clear errors and D_TC flag */
DMACSR(sc) |= D_INVALIDATE;
DMAWAIT1(sc);
DMADDR(sc) = *sc->sc_dmaaddr;
DMACSR(sc) |= datain|D_EN_DMA|D_INT_EN;
@ -314,8 +307,9 @@ dmaintr(sc)
ESP_DMA(("%s: intr\n", sc->sc_dev.dv_xname));
if (DMACSR(sc) & D_ERR_PEND) {
printf("%s: error", sc->sc_dev.dv_xname);
DMACSR(sc) &= ~D_EN_DMA; /* Stop DMA */
DMACSR(sc) |= D_INVALIDATE;
printf("%s: error", sc->sc_dev.dv_xname);
return 0;
}
@ -327,6 +321,11 @@ dmaintr(sc)
DMACSR(sc) &= ~D_EN_DMA;
sc->sc_active = 0;
DMAWAIT(sc);
/* clear errors and D_TC flag */
DMACSR(sc) |= D_INVALIDATE;
DMAWAIT1(sc);
if (sc->sc_dmasize == 0) {
/* A "Transfer Pad" operation completed */
ESP_DMA(("dmaintr: discarded %d bytes (tcl=%d, tcm=%d)\n", esp[ESP_TCL] | (esp[ESP_TCM] << 8), esp[ESP_TCL], esp[ESP_TCM]));
@ -349,7 +348,7 @@ dmaintr(sc)
trans = sc->sc_dmasize;
}
ESP_DMA(("dmaintr: tcl=%d, tcm=%d, tch=%d; resid=%d, trans=%d\n", esp[ESP_TCL],esp[ESP_TCM], esp[ESP_TCH], trans, resid));
ESP_DMA(("dmaintr: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n", esp[ESP_TCL],esp[ESP_TCM], esp[ESP_TCH], trans, resid));
if (DMACSR(sc) & D_WRITE)
cache_flush(*sc->sc_dmaaddr, trans);