Add alternate descriptors support for if_dwc.

This also adds a newbus interface that allows a SoC to override the
following settings:

 - if_dwc specific SoC initialization;
 - if_dwc descriptor type;
 - if_dwc MII clock.

This seems to be an old version of the hardware descriptors but it is
still in use in a few SoCs (namely Allwinner A20 and Amlogic at least).

Tested on Cubieboard2 and Banana pi.

Tested for regressions on Altera Cyclone by br@ (old version).

Obtained from:	NetBSD

6 files changed, 219 insertions, 70 deletions

diff --git a/sys/arm/altera/socfpga/files.socfpga b/sys/arm/altera/socfpga/files.socfpga
index 901069b..8c930df 100644
--- a/sys/arm/altera/socfpga/files.socfpga
+++ b/sys/arm/altera/socfpga/files.socfpga
@@ -15,7 +15,6 @@ arm/altera/socfpga/socfpga_rstmgr.c		standard
 arm/altera/socfpga/socfpga_mp.c			optional smp
 arm/altera/socfpga/socfpga_gpio.c		optional gpio
 
-dev/dwc/if_dwc.c				optional dwc
 dev/mii/micphy.c				optional micphy
 dev/mmc/host/dwmmc.c				optional dwmmc
 
diff --git a/sys/arm/amlogic/aml8726/files.aml8726 b/sys/arm/amlogic/aml8726/files.aml8726
index e4bc31e..0f198aa 100644
--- a/sys/arm/amlogic/aml8726/files.aml8726
+++ b/sys/arm/amlogic/aml8726/files.aml8726
@@ -32,5 +32,3 @@ arm/amlogic/aml8726/aml8726_pinctrl.c		optional	fdt_pinctrl
 arm/amlogic/aml8726/uart_dev_aml8726.c		optional	uart
 arm/amlogic/aml8726/aml8726_usb_phy-m3.c	optional	dwcotg usb gpio
 arm/amlogic/aml8726/aml8726_usb_phy-m6.c	optional	dwcotg usb gpio
-
-dev/dwc/if_dwc.c				optional	dwc
diff --git a/sys/conf/files.arm b/sys/conf/files.arm
index 743fd86..8f03809 100644
--- a/sys/conf/files.arm
+++ b/sys/conf/files.arm
@@ -84,6 +84,8 @@ cddl/dev/dtrace/arm/dtrace_subr.c			optional dtrace compile-with "${DTRACE_C}"
 cddl/dev/fbt/arm/fbt_isa.c				optional dtrace_fbt | dtraceall compile-with "${FBT_C}"
 crypto/blowfish/bf_enc.c	optional	crypto | ipsec 
 crypto/des/des_enc.c		optional	crypto | ipsec | netsmb
+dev/dwc/if_dwc.c		optional	dwc
+dev/dwc/if_dwc_if.m		optional	dwc
 dev/fb/fb.c			optional	sc
 dev/fdt/fdt_arm_platform.c	optional	platform fdt
 dev/hwpmc/hwpmc_arm.c		optional	hwpmc
diff --git a/sys/dev/dwc/if_dwc.c b/sys/dev/dwc/if_dwc.c
index c1cfe2c..e25d7f5 100644
--- a/sys/dev/dwc/if_dwc.c
+++ b/sys/dev/dwc/if_dwc.c
@@ -63,11 +63,13 @@ __FBSDID("$FreeBSD$");
 #include <machine/bus.h>
 
 #include <dev/dwc/if_dwc.h>
+#include <dev/dwc/if_dwcvar.h>
 #include <dev/mii/mii.h>
 #include <dev/mii/miivar.h>
 #include <dev/ofw/ofw_bus.h>
 #include <dev/ofw/ofw_bus_subr.h>
 
+#include "if_dwc_if.h"
 #include "miibus_if.h"
 
 #define	READ4(_sc, _reg) \
@@ -78,7 +80,6 @@ __FBSDID("$FreeBSD$");
 #define	MAC_RESET_TIMEOUT	100
 #define	WATCHDOG_TIMEOUT_SECS	5
 #define	STATS_HARVEST_INTERVAL	2
-#define	MII_CLK_VAL		2
 
 #define	DWC_LOCK(sc)			mtx_lock(&(sc)->mtx)
 #define	DWC_UNLOCK(sc)			mtx_unlock(&(sc)->mtx)
@@ -98,77 +99,34 @@ __FBSDID("$FreeBSD$");
 #define	DDESC_RDES0_FL_SHIFT		16	/* Frame Length */
 #define	DDESC_RDES1_CHAINED		(1U << 14)
 
-struct dwc_bufmap {
-	bus_dmamap_t	map;
-	struct mbuf	*mbuf;
-};
+/* Alt descriptor bits. */
+#define	DDESC_CNTL_TXINT		(1U << 31)
+#define	DDESC_CNTL_TXLAST		(1U << 30)
+#define	DDESC_CNTL_TXFIRST		(1U << 29)
+#define	DDESC_CNTL_TXCRCDIS		(1U << 26)
+#define	DDESC_CNTL_TXRINGEND		(1U << 25)
+#define	DDESC_CNTL_TXCHAIN		(1U << 24)
+
+#define	DDESC_CNTL_CHAINED		(1U << 24)
 
 /*
  * A hardware buffer descriptor.  Rx and Tx buffers have the same descriptor
- * layout, but the bits in the flags field have different meanings.
+ * layout, but the bits in the fields have different meanings.
  */
 struct dwc_hwdesc
 {
-	uint32_t tdes0;
-	uint32_t tdes1;
+	uint32_t tdes0;		/* status for alt layout */
+	uint32_t tdes1;		/* cntl for alt layout */
 	uint32_t addr;		/* pointer to buffer data */
 	uint32_t addr_next;	/* link to next descriptor */
 };
 
 /*
- * Driver data and defines.
- */
-#define	RX_DESC_COUNT	1024
-#define	RX_DESC_SIZE	(sizeof(struct dwc_hwdesc) * RX_DESC_COUNT)
-#define	TX_DESC_COUNT	1024
-#define	TX_DESC_SIZE	(sizeof(struct dwc_hwdesc) * TX_DESC_COUNT)
-
-/*
  * The hardware imposes alignment restrictions on various objects involved in
  * DMA transfers.  These values are expressed in bytes (not bits).
  */
 #define	DWC_DESC_RING_ALIGN		2048
 
-struct dwc_softc {
-	struct resource		*res[2];
-	bus_space_tag_t		bst;
-	bus_space_handle_t	bsh;
-	device_t		dev;
-	int			mii_clk;
-	device_t		miibus;
-	struct mii_data *	mii_softc;
-	struct ifnet		*ifp;
-	int			if_flags;
-	struct mtx		mtx;
-	void *			intr_cookie;
-	struct callout		dwc_callout;
-	boolean_t		link_is_up;
-	boolean_t		is_attached;
-	boolean_t		is_detaching;
-	int			tx_watchdog_count;
-	int			stats_harvest_count;
-
-	/* RX */
-	bus_dma_tag_t		rxdesc_tag;
-	bus_dmamap_t		rxdesc_map;
-	struct dwc_hwdesc	*rxdesc_ring;
-	bus_addr_t		rxdesc_ring_paddr;
-	bus_dma_tag_t		rxbuf_tag;
-	struct dwc_bufmap	rxbuf_map[RX_DESC_COUNT];
-	uint32_t		rx_idx;
-
-	/* TX */
-	bus_dma_tag_t		txdesc_tag;
-	bus_dmamap_t		txdesc_map;
-	struct dwc_hwdesc	*txdesc_ring;
-	bus_addr_t		txdesc_ring_paddr;
-	bus_dma_tag_t		txbuf_tag;
-	struct dwc_bufmap	txbuf_map[RX_DESC_COUNT];
-	uint32_t		tx_idx_head;
-	uint32_t		tx_idx_tail;
-	int			txcount;
-};
-
 static struct resource_spec dwc_spec[] = {
 	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
 	{ SYS_RES_IRQ,		0,	RF_ACTIVE },
@@ -217,14 +175,23 @@ dwc_setup_txdesc(struct dwc_softc *sc, int idx, bus_addr_t paddr,
 		flags = 0;
 		--sc->txcount;
 	} else {
-		flags = DDESC_TDES0_TXCHAIN | DDESC_TDES0_TXFIRST
-		    | DDESC_TDES0_TXLAST | DDESC_TDES0_TXINT;
+		if (sc->mactype == DWC_GMAC_ALT_DESC)
+			flags = DDESC_CNTL_TXCHAIN | DDESC_CNTL_TXFIRST
+			    | DDESC_CNTL_TXLAST | DDESC_CNTL_TXINT;
+		else
+			flags = DDESC_TDES0_TXCHAIN | DDESC_TDES0_TXFIRST
+			    | DDESC_TDES0_TXLAST | DDESC_TDES0_TXINT;
 		++sc->txcount;
 	}
 
 	sc->txdesc_ring[idx].addr = (uint32_t)(paddr);
-	sc->txdesc_ring[idx].tdes0 = flags;
-	sc->txdesc_ring[idx].tdes1 = len;
+	if (sc->mactype == DWC_GMAC_ALT_DESC) {
+		sc->txdesc_ring[idx].tdes0 = 0;
+		sc->txdesc_ring[idx].tdes1 = flags | len;
+	} else {
+		sc->txdesc_ring[idx].tdes0 = flags;
+		sc->txdesc_ring[idx].tdes1 = len;
+	}
 
 	if (paddr && len) {
 		wmb();
@@ -497,7 +464,10 @@ dwc_setup_rxdesc(struct dwc_softc *sc, int idx, bus_addr_t paddr)
 	nidx = next_rxidx(sc, idx);
 	sc->rxdesc_ring[idx].addr_next = sc->rxdesc_ring_paddr +	\
 	    (nidx * sizeof(struct dwc_hwdesc));
-	sc->rxdesc_ring[idx].tdes1 = DDESC_RDES1_CHAINED | MCLBYTES;
+	if (sc->mactype == DWC_GMAC_ALT_DESC)
+		sc->rxdesc_ring[idx].tdes1 = DDESC_CNTL_CHAINED | RX_MAX_PACKET;
+	else
+		sc->rxdesc_ring[idx].tdes1 = DDESC_RDES1_CHAINED | MCLBYTES;
 
 	wmb();
 	sc->rxdesc_ring[idx].tdes0 = DDESC_RDES0_OWN;
@@ -1065,10 +1035,13 @@ dwc_attach(device_t dev)
 
 	sc = device_get_softc(dev);
 	sc->dev = dev;
-	sc->mii_clk = MII_CLK_VAL;
 	sc->rx_idx = 0;
-
 	sc->txcount = TX_DESC_COUNT;
+	sc->mii_clk = IF_DWC_MII_CLK(dev);
+	sc->mactype = IF_DWC_MAC_TYPE(dev);
+
+	if (IF_DWC_INIT(dev) != 0)
+		return (ENXIO);
 
 	if (bus_alloc_resources(dev, dwc_spec, sc->res)) {
 		device_printf(dev, "could not allocate resources\n");
@@ -1100,8 +1073,11 @@ dwc_attach(device_t dev)
 		return (ENXIO);
 	}
 
-	reg = READ4(sc, BUS_MODE);
-	reg |= (BUS_MODE_EIGHTXPBL);
+	if (sc->mactype == DWC_GMAC_ALT_DESC) {
+		reg = BUS_MODE_FIXEDBURST;
+		reg |= (BUS_MODE_PRIORXTX_41 << BUS_MODE_PRIORXTX_SHIFT);
+	} else
+		reg = (BUS_MODE_EIGHTXPBL);
 	reg |= (BUS_MODE_PBL_BEATS_8 << BUS_MODE_PBL_SHIFT);
 	WRITE4(sc, BUS_MODE, reg);
 
@@ -1146,7 +1122,6 @@ dwc_attach(device_t dev)
 	IFQ_SET_MAXLEN(&ifp->if_snd, TX_DESC_COUNT - 1);
 	ifp->if_snd.ifq_drv_maxlen = TX_DESC_COUNT - 1;
 	IFQ_SET_READY(&ifp->if_snd);
-	ifp->if_hdrlen = sizeof(struct ether_vlan_header);
 
 	/* Attach the mii driver. */
 	error = mii_attach(dev, &sc->miibus, ifp, dwc_media_change,
@@ -1285,7 +1260,7 @@ static device_method_t dwc_methods[] = {
 	{ 0, 0 }
 };
 
-static driver_t dwc_driver = {
+driver_t dwc_driver = {
 	"dwc",
 	dwc_methods,
 	sizeof(struct dwc_softc),
diff --git a/sys/dev/dwc/if_dwc_if.m b/sys/dev/dwc/if_dwc_if.m
new file mode 100644
index 0000000..feecb4e
--- /dev/null
+++ b/sys/dev/dwc/if_dwc_if.m
@@ -0,0 +1,76 @@
+#-
+# Copyright (c) 2015 Luiz Otavio O Souza <loos@FreeBSD.org>
+# Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
+# 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.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+#
+# $FreeBSD$
+#
+
+INTERFACE if_dwc;
+
+#include <dev/dwc/if_dwc.h>
+
+CODE {
+	static int
+	if_dwc_default_init(device_t dev)
+	{
+		return (0);
+	}
+
+	static int
+	if_dwc_default_mac_type(device_t dev)
+	{
+		return (DWC_GMAC);
+	}
+
+	static int
+	if_dwc_default_mii_clk(device_t dev)
+	{
+		return (GMAC_MII_CLK_25_35M_DIV16);
+	}
+};
+
+HEADER {
+};
+
+#
+# Initialize the SoC specific registers.
+#
+METHOD int init {
+	device_t dev;
+} DEFAULT if_dwc_default_init;
+
+#
+# Return the DWC MAC type (descriptor type).
+#
+METHOD int mac_type {
+	device_t dev;
+} DEFAULT if_dwc_default_mac_type;
+
+#
+# Return the DWC MII clock for a specific hardware.
+#
+METHOD int mii_clk {
+	device_t dev;
+} DEFAULT if_dwc_default_mii_clk;
diff --git a/sys/dev/dwc/if_dwcvar.h b/sys/dev/dwc/if_dwcvar.h
new file mode 100644
index 0000000..3dd6a8d
--- /dev/null
+++ b/sys/dev/dwc/if_dwcvar.h
@@ -0,0 +1,99 @@
+/*-
+ * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * This software was developed by SRI International and the University of
+ * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
+ * ("CTSRD"), as part of the DARPA CRASH research programme.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ *
+ * $FreeBSD$
+ */
+
+/*
+ * Ethernet media access controller (EMAC)
+ * Chapter 17, Altera Cyclone V Device Handbook (CV-5V2 2014.07.22)
+ *
+ * EMAC is an instance of the Synopsys DesignWare 3504-0
+ * Universal 10/100/1000 Ethernet MAC (DWC_gmac).
+ */
+
+#ifndef	__IF_DWCVAR_H__
+#define	__IF_DWCVAR_H__
+
+/*
+ * Driver data and defines.
+ */
+#define	RX_MAX_PACKET	0x7ff
+#define	RX_DESC_COUNT	1024
+#define	RX_DESC_SIZE	(sizeof(struct dwc_hwdesc) * RX_DESC_COUNT)
+#define	TX_DESC_COUNT	1024
+#define	TX_DESC_SIZE	(sizeof(struct dwc_hwdesc) * TX_DESC_COUNT)
+
+struct dwc_bufmap {
+	bus_dmamap_t		map;
+	struct mbuf		*mbuf;
+};
+
+struct dwc_softc {
+	struct resource		*res[2];
+	bus_space_tag_t		bst;
+	bus_space_handle_t	bsh;
+	device_t		dev;
+	int			mactype;
+	int			mii_clk;
+	device_t		miibus;
+	struct mii_data *	mii_softc;
+	struct ifnet		*ifp;
+	int			if_flags;
+	struct mtx		mtx;
+	void *			intr_cookie;
+	struct callout		dwc_callout;
+	boolean_t		link_is_up;
+	boolean_t		is_attached;
+	boolean_t		is_detaching;
+	int			tx_watchdog_count;
+	int			stats_harvest_count;
+
+	/* RX */
+	bus_dma_tag_t		rxdesc_tag;
+	bus_dmamap_t		rxdesc_map;
+	struct dwc_hwdesc	*rxdesc_ring;
+	bus_addr_t		rxdesc_ring_paddr;
+	bus_dma_tag_t		rxbuf_tag;
+	struct dwc_bufmap	rxbuf_map[RX_DESC_COUNT];
+	uint32_t		rx_idx;
+
+	/* TX */
+	bus_dma_tag_t		txdesc_tag;
+	bus_dmamap_t		txdesc_map;
+	struct dwc_hwdesc	*txdesc_ring;
+	bus_addr_t		txdesc_ring_paddr;
+	bus_dma_tag_t		txbuf_tag;
+	struct dwc_bufmap	txbuf_map[RX_DESC_COUNT];
+	uint32_t		tx_idx_head;
+	uint32_t		tx_idx_tail;
+	int			txcount;
+};
+
+#endif	/* __IF_DWCVAR_H__ */