Enable DMA bursting. Not sure it actually makes things faster, but both

isp(4) and the linux qla1280 driver seem to do this.

3 files changed, 69 insertions, 21 deletions

diff --git a/sys/dev/ic/qlw.c b/sys/dev/ic/qlw.c
index ed76ab3895f..b523c7e8d9f 100644
--- a/sys/dev/ic/qlw.c
+++ b/sys/dev/ic/qlw.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: qlw.c,v 1.4 2014/03/07 22:39:07 kettenis Exp $ */
+/*	$OpenBSD: qlw.c,v 1.5 2014/03/08 15:13:12 kettenis Exp $ */
 
 /*
  * Copyright (c) 2011 David Gwynne <dlg@openbsd.org>
@@ -93,6 +93,7 @@ struct qlw_ccb *qlw_handle_resp(struct qlw_softc *, u_int16_t);
 void		qlw_put_data_seg(struct qlw_iocb_seg *, bus_dmamap_t, int);
 
 int		qlw_softreset(struct qlw_softc *);
+void		qlw_dma_burst_enable(struct qlw_softc *);
 
 void		qlw_update_start(struct qlw_softc *, int);
 int		qlw_async(struct qlw_softc *, u_int16_t);
@@ -225,9 +226,13 @@ qlw_attach(struct qlw_softc *sc)
 	/* We may need up to 3 request entries per SCSI command. */
 	sc->sc_maxccbs = sc->sc_maxcmds / 3;
 
-#if 0
-	qlw_write(sc, QLW_CFG1, sc->sc_nvram.isp_config | (1 << 13));
-#endif
+	/* Allegedly the FIFO is busted on the 1040A. */
+	if (sc->sc_isp_type == QLW_ISP1040A)
+		sc->sc_isp_config &= ~QLW_PCI_FIFO_MASK;
+	qlw_write(sc, QLW_CFG1, sc->sc_isp_config);
+
+	if (sc->sc_isp_config & QLW_BURST_ENABLE)
+		qlw_dma_burst_enable(sc);
 
 #if 0
 	/* set SCSI termination */
@@ -300,16 +305,6 @@ qlw_attach(struct qlw_softc *sc)
 	}
 #endif
 
-#if 0
-	sc->sc_mbox[0] = QLW_MBOX_SET_PCI_CONTROL;
-	sc->sc_mbox[1] = 0x0002; /* data dma channel burst enable */
-	sc->sc_mbox[2] = 0x0002; /* command dma channel burst enable */
-	if (qlw_mbox(sc, 0x0007, 0x0001)) {
-		printf("couldn't set PCI control: %x\n", sc->sc_mbox[0]);
-		return (ENXIO);
-	}
-#endif
-
 	sc->sc_mbox[0] = QLW_MBOX_SET_TAG_AGE_LIMIT;
 	sc->sc_mbox[1] = 8;
 	sc->sc_mbox[2] = 8;
@@ -1090,11 +1085,7 @@ qlw_softreset(struct qlw_softc *sc)
 	/* reset risc processor */
 	qlw_host_cmd(sc, QLW_HOST_CMD_RESET);
 	delay(100);
-
 	qlw_write(sc, QLW_SEMA, 0);
-
-	qlw_write(sc, QLW_CFG1, qlw_read(sc, QLW_CFG1) | 0x04 | 0x03);
-
 	qlw_host_cmd(sc, QLW_HOST_CMD_RELEASE);
 
 	/* reset queue pointers */
@@ -1118,6 +1109,28 @@ qlw_softreset(struct qlw_softc *sc)
 }
 
 void
+qlw_dma_burst_enable(struct qlw_softc *sc)
+{
+	if (sc->sc_isp_gen == QLW_GEN_ISP1040) {
+		qlw_write(sc, QLW_CDMA_CFG,
+		    qlw_read(sc, QLW_CDMA_CFG) | QLW_DMA_BURST_ENABLE);
+		qlw_write(sc, QLW_DDMA_CFG,
+		    qlw_read(sc, QLW_DDMA_CFG) | QLW_DMA_BURST_ENABLE);
+	} else {
+		qlw_host_cmd(sc, QLW_HOST_CMD_PAUSE);
+		qlw_write(sc, QLW_CFG1,
+		    qlw_read(sc, QLW_CFG1) | QLW_DMA_BANK);
+		qlw_write(sc, QLW_CDMA_CFG_1080,
+		    qlw_read(sc, QLW_CDMA_CFG_1080) | QLW_DMA_BURST_ENABLE);
+		qlw_write(sc, QLW_DDMA_CFG_1080,
+		    qlw_read(sc, QLW_DDMA_CFG_1080) | QLW_DMA_BURST_ENABLE);
+		qlw_write(sc, QLW_CFG1,
+		    qlw_read(sc, QLW_CFG1) & ~QLW_DMA_BANK);
+		qlw_host_cmd(sc, QLW_HOST_CMD_RELEASE);
+	}
+}
+
+void
 qlw_update(struct qlw_softc *sc, int task)
 {
 	/* do things */
@@ -1461,6 +1474,8 @@ qlw_parse_nvram_1080(struct qlw_softc *sc, int bus)
 	struct qlw_nvram_bus *nv = &nvram->bus[bus];
 	int target;
 
+	sc->sc_isp_config = nvram->isp_config;
+
 	if (!ISSET(sc->sc_flags, QLW_FLAG_INITIATOR))
 		sc->sc_initiator[bus] = (nv->config1 & 0x0f);
 
@@ -1491,6 +1506,16 @@ qlw_init_defaults(struct qlw_softc *sc, int bus)
 {
 	int target;
 
+	switch (sc->sc_isp_gen) {
+	case QLW_GEN_ISP1040:
+		sc->sc_isp_config = QLW_BURST_ENABLE | QLW_PCI_FIFO_64;
+		break;
+	case QLW_GEN_ISP1080:
+	case QLW_GEN_ISP12160:
+		sc->sc_isp_config = QLW_BURST_ENABLE | QLW_PCI_FIFO_128;
+		break;
+	}
+
 	sc->sc_retry_count[bus] = 0;
 	sc->sc_retry_delay[bus] = 0;
 	sc->sc_reset_delay[bus] = 3;
diff --git a/sys/dev/ic/qlwreg.h b/sys/dev/ic/qlwreg.h
index d584d7fc2d4..a84b54c11b2 100644
--- a/sys/dev/ic/qlwreg.h
+++ b/sys/dev/ic/qlwreg.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: qlwreg.h,v 1.1 2014/03/05 23:10:41 kettenis Exp $ */
+/*	$OpenBSD: qlwreg.h,v 1.2 2014/03/08 15:13:12 kettenis Exp $ */
 
 /*
  * Copyright (c) 2013, 2014 Jonathan Matthew <jmatthew@openbsd.org>
@@ -35,7 +35,11 @@
 #define QLW_NVRAM			0x0e
 #define QLW_FLASH_BIOS_DATA		0x10
 #define QLW_FLASH_BIOS_ADDR		0x12
+#define QLW_CDMA_CFG			0x20
+#define QLW_DDMA_CFG			0x40
 #define QLW_MBOX_BASE			0x70
+#define QLW_CDMA_CFG_1080		0x80
+#define QLW_DDMA_CFG_1080		0xa0
 #define QLW_HOST_CMD_CTRL		0xc0
 #define QLW_GPIO_DATA			0xcc
 #define QLW_GPIO_ENABLE			0xce
@@ -45,6 +49,15 @@
 #define QLW_RESP_IN	QLW_MBOX_BASE + 0xa
 #define QLW_RESP_OUT	QLW_MBOX_BASE + 0xa
 
+/* QLW_CFG1 */
+#define QLW_BURST_ENABLE		0x0004
+#define QLW_PCI_FIFO_16			0x0010
+#define QLW_PCI_FIFO_32			0x0020
+#define QLW_PCI_FIFO_64			0x0030
+#define QLW_PCI_FIFO_128		0x0040
+#define QLW_PCI_FIFO_MASK		0x0070
+#define QLW_DMA_BANK			0x0300
+
 /* QLW_INT_CTRL */
 #define QLW_RESET			0x0001
 
@@ -63,6 +76,9 @@
 #define QLW_NVRAM_CLOCK			0x0001
 #define QLW_NVRAM_CMD_READ		6
 
+/* QLW_CDMA_CFG and QLW_DDMA_CFG */
+#define QLW_DMA_BURST_ENABLE		0x0002
+
 /* QLW_HOST_CMD_CTRL write */
 #define QLW_HOST_CMD_SHIFT		12
 #define QLW_HOST_CMD_NOP		0x0
diff --git a/sys/dev/ic/qlwvar.h b/sys/dev/ic/qlwvar.h
index 5a616f8cfe0..7ce708d6229 100644
--- a/sys/dev/ic/qlwvar.h
+++ b/sys/dev/ic/qlwvar.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: qlwvar.h,v 1.5 2014/03/07 22:39:07 kettenis Exp $ */
+/*	$OpenBSD: qlwvar.h,v 1.6 2014/03/08 15:13:12 kettenis Exp $ */
 
 /*
  * Copyright (c) 2013, 2014 Jonathan Matthew <jmatthew@openbsd.org>
@@ -33,7 +33,12 @@ enum qlw_isp_gen {
 };
 
 enum qlw_isp_type {
-	QLW_ISP1040 = 1,
+	QLW_ISP1020 = 1,
+	QLW_ISP1020A,
+	QLW_ISP1040,
+	QLW_ISP1040A,
+	QLW_ISP1040B,
+	QLW_ISP1040C,
 	QLW_ISP1240,
 	QLW_ISP1080,
 	QLW_ISP1280,
@@ -115,6 +120,8 @@ struct qlw_softc {
 	int			sc_nvram_size;
 	int			sc_nvram_minversion;
 
+	u_int16_t		sc_isp_config;
+
 	u_int8_t		sc_initiator[2];
 	u_int8_t		sc_retry_count[2];
 	u_int8_t		sc_retry_delay[2];