ethernet/arc/arc_emac - Add new driver
Driver for non-standard on-chip ethernet device ARC EMAC 10/100, instantiated in some legacy ARC (Synopsys) FPGA Boards such as ARCAngel4/ML50x. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Francois Romieu <romieu@fr.zoreil.com> Cc: Joe Perches <joe@perches.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Mischa Jonker <mjonker@synopsys.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Grant Likely <grant.likely@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: linux-kernel@vger.kernel.org Cc: devicetree-discuss@lists.ozlabs.org Cc: Florian Fainelli <florian@openwrt.org> Cc: David Laight <david.laight@aculab.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Brodkin
David S. Miller
parent
62208f1245
commit
e4f2379db6
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@ -0,0 +1,38 @@
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* Synopsys ARC EMAC 10/100 Ethernet driver (EMAC)
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Required properties:
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- compatible: Should be "snps,arc-emac"
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- reg: Address and length of the register set for the device
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- interrupts: Should contain the EMAC interrupts
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- clock-frequency: CPU frequency. It is needed to calculate and set polling
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period of EMAC.
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- max-speed: Maximum supported data-rate in Mbit/s. In some HW configurations
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bandwidth of external memory controller might be a limiting factor. That's why
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it's required to specify which data-rate is supported on current SoC or FPGA.
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For example if only 10 Mbit/s is supported (10BASE-T) set "10". If 100 Mbit/s is
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supported (100BASE-TX) set "100".
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- phy: PHY device attached to the EMAC via MDIO bus
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Child nodes of the driver are the individual PHY devices connected to the
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MDIO bus. They must have a "reg" property given the PHY address on the MDIO bus.
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Optional properties:
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- mac-address: 6 bytes, mac address
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Examples:
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ethernet@c0fc2000 {
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compatible = "snps,arc-emac";
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reg = <0xc0fc2000 0x3c>;
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interrupts = <6>;
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mac-address = [ 00 11 22 33 44 55 ];
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clock-frequency = <80000000>;
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max-speed = <100>;
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phy = <&phy0>;
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#address-cells = <1>;
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#size-cells = <0>;
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phy0: ethernet-phy@0 {
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reg = <1>;
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};
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};
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@ -24,6 +24,7 @@ source "drivers/net/ethernet/allwinner/Kconfig"
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source "drivers/net/ethernet/alteon/Kconfig"
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source "drivers/net/ethernet/alteon/Kconfig"
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source "drivers/net/ethernet/amd/Kconfig"
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source "drivers/net/ethernet/amd/Kconfig"
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source "drivers/net/ethernet/apple/Kconfig"
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source "drivers/net/ethernet/apple/Kconfig"
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source "drivers/net/ethernet/arc/Kconfig"
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source "drivers/net/ethernet/atheros/Kconfig"
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source "drivers/net/ethernet/atheros/Kconfig"
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source "drivers/net/ethernet/cadence/Kconfig"
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source "drivers/net/ethernet/cadence/Kconfig"
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source "drivers/net/ethernet/adi/Kconfig"
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source "drivers/net/ethernet/adi/Kconfig"
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@ -10,6 +10,7 @@ obj-$(CONFIG_NET_VENDOR_ALLWINNER) += allwinner/
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obj-$(CONFIG_NET_VENDOR_ALTEON) += alteon/
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obj-$(CONFIG_NET_VENDOR_ALTEON) += alteon/
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obj-$(CONFIG_NET_VENDOR_AMD) += amd/
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obj-$(CONFIG_NET_VENDOR_AMD) += amd/
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obj-$(CONFIG_NET_VENDOR_APPLE) += apple/
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obj-$(CONFIG_NET_VENDOR_APPLE) += apple/
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obj-$(CONFIG_NET_VENDOR_ARC) += arc/
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obj-$(CONFIG_NET_VENDOR_ATHEROS) += atheros/
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obj-$(CONFIG_NET_VENDOR_ATHEROS) += atheros/
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obj-$(CONFIG_NET_CADENCE) += cadence/
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obj-$(CONFIG_NET_CADENCE) += cadence/
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obj-$(CONFIG_NET_BFIN) += adi/
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obj-$(CONFIG_NET_BFIN) += adi/
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@ -0,0 +1,31 @@
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#
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# ARC EMAC network device configuration
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#
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config NET_VENDOR_ARC
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bool "ARC devices"
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default y
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---help---
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If you have a network (Ethernet) card belonging to this class, say Y
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and read the Ethernet-HOWTO, available from
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<http://www.tldp.org/docs.html#howto>.
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Note that the answer to this question doesn't directly affect the
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kernel: saying N will just cause the configurator to skip all
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the questions about ARC cards. If you say Y, you will be asked for
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your specific card in the following questions.
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if NET_VENDOR_ARC
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config ARC_EMAC
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tristate "ARC EMAC support"
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select MII
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select PHYLIB
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depends on OF_IRQ
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depends on OF_NET
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---help---
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On some legacy ARC (Synopsys) FPGA boards such as ARCAngel4/ML50x
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non-standard on-chip ethernet device ARC EMAC 10/100 is used.
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Say Y here if you have such a board. If unsure, say N.
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endif # NET_VENDOR_ARC
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@ -0,0 +1,6 @@
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#
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# Makefile for the ARC network device drivers.
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#
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arc_emac-objs := emac_main.o emac_mdio.o
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obj-$(CONFIG_ARC_EMAC) += arc_emac.o
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@ -0,0 +1,214 @@
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/*
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* Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
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*
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* Registers and bits definitions of ARC EMAC
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*/
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#ifndef ARC_EMAC_H
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#define ARC_EMAC_H
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/netdevice.h>
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#include <linux/phy.h>
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/* STATUS and ENABLE Register bit masks */
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#define TXINT_MASK (1<<0) /* Transmit interrupt */
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#define RXINT_MASK (1<<1) /* Receive interrupt */
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#define ERR_MASK (1<<2) /* Error interrupt */
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#define TXCH_MASK (1<<3) /* Transmit chaining error interrupt */
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#define MSER_MASK (1<<4) /* Missed packet counter error */
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#define RXCR_MASK (1<<8) /* RXCRCERR counter rolled over */
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#define RXFR_MASK (1<<9) /* RXFRAMEERR counter rolled over */
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#define RXFL_MASK (1<<10) /* RXOFLOWERR counter rolled over */
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#define MDIO_MASK (1<<12) /* MDIO complete interrupt */
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#define TXPL_MASK (1<<31) /* Force polling of BD by EMAC */
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/* CONTROL Register bit masks */
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#define EN_MASK (1<<0) /* VMAC enable */
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#define TXRN_MASK (1<<3) /* TX enable */
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#define RXRN_MASK (1<<4) /* RX enable */
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#define DSBC_MASK (1<<8) /* Disable receive broadcast */
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#define ENFL_MASK (1<<10) /* Enable Full-duplex */
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#define PROM_MASK (1<<11) /* Promiscuous mode */
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/* Buffer descriptor INFO bit masks */
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#define OWN_MASK (1<<31) /* 0-CPU owns buffer, 1-EMAC owns buffer */
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#define FIRST_MASK (1<<16) /* First buffer in chain */
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#define LAST_MASK (1<<17) /* Last buffer in chain */
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#define LEN_MASK 0x000007FF /* last 11 bits */
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#define CRLS (1<<21)
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#define DEFR (1<<22)
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#define DROP (1<<23)
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#define RTRY (1<<24)
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#define LTCL (1<<28)
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#define UFLO (1<<29)
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#define FOR_EMAC OWN_MASK
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#define FOR_CPU 0
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/* ARC EMAC register set combines entries for MAC and MDIO */
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enum {
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R_ID = 0,
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R_STATUS,
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R_ENABLE,
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R_CTRL,
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R_POLLRATE,
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R_RXERR,
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R_MISS,
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R_TX_RING,
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R_RX_RING,
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R_ADDRL,
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R_ADDRH,
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R_LAFL,
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R_LAFH,
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R_MDIO,
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};
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#define TX_TIMEOUT (400*HZ/1000) /* Transmission timeout */
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#define ARC_EMAC_NAPI_WEIGHT 40 /* Workload for NAPI */
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#define EMAC_BUFFER_SIZE 1536 /* EMAC buffer size */
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/**
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* struct arc_emac_bd - EMAC buffer descriptor (BD).
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*
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* @info: Contains status information on the buffer itself.
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* @data: 32-bit byte addressable pointer to the packet data.
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*/
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struct arc_emac_bd {
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__le32 info;
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dma_addr_t data;
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};
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/* Number of Rx/Tx BD's */
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#define RX_BD_NUM 128
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#define TX_BD_NUM 128
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#define RX_RING_SZ (RX_BD_NUM * sizeof(struct arc_emac_bd))
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#define TX_RING_SZ (TX_BD_NUM * sizeof(struct arc_emac_bd))
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/**
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* struct buffer_state - Stores Rx/Tx buffer state.
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* @sk_buff: Pointer to socket buffer.
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* @addr: Start address of DMA-mapped memory region.
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* @len: Length of DMA-mapped memory region.
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*/
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struct buffer_state {
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struct sk_buff *skb;
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DEFINE_DMA_UNMAP_ADDR(addr);
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DEFINE_DMA_UNMAP_LEN(len);
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};
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/**
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* struct arc_emac_priv - Storage of EMAC's private information.
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* @dev: Pointer to the current device.
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* @ndev: Pointer to the current network device.
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* @phy_dev: Pointer to attached PHY device.
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* @bus: Pointer to the current MII bus.
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* @regs: Base address of EMAC memory-mapped control registers.
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* @napi: Structure for NAPI.
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* @stats: Network device statistics.
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* @rxbd: Pointer to Rx BD ring.
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* @txbd: Pointer to Tx BD ring.
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* @rxbd_dma: DMA handle for Rx BD ring.
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* @txbd_dma: DMA handle for Tx BD ring.
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* @rx_buff: Storage for Rx buffers states.
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* @tx_buff: Storage for Tx buffers states.
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* @txbd_curr: Index of Tx BD to use on the next "ndo_start_xmit".
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* @txbd_dirty: Index of Tx BD to free on the next Tx interrupt.
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* @last_rx_bd: Index of the last Rx BD we've got from EMAC.
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* @link: PHY's last seen link state.
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* @duplex: PHY's last set duplex mode.
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* @speed: PHY's last set speed.
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* @max_speed: Maximum supported by current system network data-rate.
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*/
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struct arc_emac_priv {
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/* Devices */
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struct device *dev;
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struct net_device *ndev;
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struct phy_device *phy_dev;
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struct mii_bus *bus;
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void __iomem *regs;
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struct napi_struct napi;
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struct net_device_stats stats;
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struct arc_emac_bd *rxbd;
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struct arc_emac_bd *txbd;
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dma_addr_t rxbd_dma;
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dma_addr_t txbd_dma;
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struct buffer_state rx_buff[RX_BD_NUM];
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struct buffer_state tx_buff[TX_BD_NUM];
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unsigned int txbd_curr;
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unsigned int txbd_dirty;
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unsigned int last_rx_bd;
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unsigned int link;
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unsigned int duplex;
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unsigned int speed;
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unsigned int max_speed;
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};
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/**
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* arc_reg_set - Sets EMAC register with provided value.
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* @priv: Pointer to ARC EMAC private data structure.
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* @reg: Register offset from base address.
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* @value: Value to set in register.
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*/
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static inline void arc_reg_set(struct arc_emac_priv *priv, int reg, int value)
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{
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iowrite32(value, priv->regs + reg * sizeof(int));
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}
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/**
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* arc_reg_get - Gets value of specified EMAC register.
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* @priv: Pointer to ARC EMAC private data structure.
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* @reg: Register offset from base address.
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*
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* returns: Value of requested register.
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*/
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static inline unsigned int arc_reg_get(struct arc_emac_priv *priv, int reg)
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{
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return ioread32(priv->regs + reg * sizeof(int));
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}
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/**
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* arc_reg_or - Applies mask to specified EMAC register - ("reg" | "mask").
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* @priv: Pointer to ARC EMAC private data structure.
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* @reg: Register offset from base address.
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* @mask: Mask to apply to specified register.
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*
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* This function reads initial register value, then applies provided mask
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* to it and then writes register back.
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*/
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static inline void arc_reg_or(struct arc_emac_priv *priv, int reg, int mask)
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{
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unsigned int value = arc_reg_get(priv, reg);
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arc_reg_set(priv, reg, value | mask);
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}
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/**
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* arc_reg_clr - Applies mask to specified EMAC register - ("reg" & ~"mask").
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* @priv: Pointer to ARC EMAC private data structure.
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* @reg: Register offset from base address.
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* @mask: Mask to apply to specified register.
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*
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* This function reads initial register value, then applies provided mask
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* to it and then writes register back.
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*/
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static inline void arc_reg_clr(struct arc_emac_priv *priv, int reg, int mask)
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{
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unsigned int value = arc_reg_get(priv, reg);
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arc_reg_set(priv, reg, value & ~mask);
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}
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int arc_mdio_probe(struct platform_device *pdev, struct arc_emac_priv *priv);
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int arc_mdio_remove(struct arc_emac_priv *priv);
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#endif /* ARC_EMAC_H */
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@ -0,0 +1,806 @@
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/*
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* Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Driver for the ARC EMAC 10100 (hardware revision 5)
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*
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* Contributors:
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* Amit Bhor
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* Sameer Dhavale
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* Vineet Gupta
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*/
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#include <linux/etherdevice.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_mdio.h>
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#include <linux/of_net.h>
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#include <linux/of_platform.h>
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#include "emac.h"
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#define DRV_NAME "arc_emac"
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#define DRV_VERSION "1.0"
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/**
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* arc_emac_adjust_link - Adjust the PHY link duplex.
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* @ndev: Pointer to the net_device structure.
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*
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||||||
|
* This function is called to change the duplex setting after auto negotiation
|
||||||
|
* is done by the PHY.
|
||||||
|
*/
|
||||||
|
static void arc_emac_adjust_link(struct net_device *ndev)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
struct phy_device *phy_dev = priv->phy_dev;
|
||||||
|
unsigned int reg, state_changed = 0;
|
||||||
|
|
||||||
|
if (priv->link != phy_dev->link) {
|
||||||
|
priv->link = phy_dev->link;
|
||||||
|
state_changed = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (priv->speed != phy_dev->speed) {
|
||||||
|
priv->speed = phy_dev->speed;
|
||||||
|
state_changed = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (priv->duplex != phy_dev->duplex) {
|
||||||
|
reg = arc_reg_get(priv, R_CTRL);
|
||||||
|
|
||||||
|
if (DUPLEX_FULL == phy_dev->duplex)
|
||||||
|
reg |= ENFL_MASK;
|
||||||
|
else
|
||||||
|
reg &= ~ENFL_MASK;
|
||||||
|
|
||||||
|
arc_reg_set(priv, R_CTRL, reg);
|
||||||
|
priv->duplex = phy_dev->duplex;
|
||||||
|
state_changed = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (state_changed)
|
||||||
|
phy_print_status(phy_dev);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_get_settings - Get PHY settings.
|
||||||
|
* @ndev: Pointer to net_device structure.
|
||||||
|
* @cmd: Pointer to ethtool_cmd structure.
|
||||||
|
*
|
||||||
|
* This implements ethtool command for getting PHY settings. If PHY could
|
||||||
|
* not be found, the function returns -ENODEV. This function calls the
|
||||||
|
* relevant PHY ethtool API to get the PHY settings.
|
||||||
|
* Issue "ethtool ethX" under linux prompt to execute this function.
|
||||||
|
*/
|
||||||
|
static int arc_emac_get_settings(struct net_device *ndev,
|
||||||
|
struct ethtool_cmd *cmd)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
|
||||||
|
return phy_ethtool_gset(priv->phy_dev, cmd);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_set_settings - Set PHY settings as passed in the argument.
|
||||||
|
* @ndev: Pointer to net_device structure.
|
||||||
|
* @cmd: Pointer to ethtool_cmd structure.
|
||||||
|
*
|
||||||
|
* This implements ethtool command for setting various PHY settings. If PHY
|
||||||
|
* could not be found, the function returns -ENODEV. This function calls the
|
||||||
|
* relevant PHY ethtool API to set the PHY.
|
||||||
|
* Issue e.g. "ethtool -s ethX speed 1000" under linux prompt to execute this
|
||||||
|
* function.
|
||||||
|
*/
|
||||||
|
static int arc_emac_set_settings(struct net_device *ndev,
|
||||||
|
struct ethtool_cmd *cmd)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
|
||||||
|
if (!capable(CAP_NET_ADMIN))
|
||||||
|
return -EPERM;
|
||||||
|
|
||||||
|
return phy_ethtool_sset(priv->phy_dev, cmd);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_get_drvinfo - Get EMAC driver information.
|
||||||
|
* @ndev: Pointer to net_device structure.
|
||||||
|
* @info: Pointer to ethtool_drvinfo structure.
|
||||||
|
*
|
||||||
|
* This implements ethtool command for getting the driver information.
|
||||||
|
* Issue "ethtool -i ethX" under linux prompt to execute this function.
|
||||||
|
*/
|
||||||
|
static void arc_emac_get_drvinfo(struct net_device *ndev,
|
||||||
|
struct ethtool_drvinfo *info)
|
||||||
|
{
|
||||||
|
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
|
||||||
|
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct ethtool_ops arc_emac_ethtool_ops = {
|
||||||
|
.get_settings = arc_emac_get_settings,
|
||||||
|
.set_settings = arc_emac_set_settings,
|
||||||
|
.get_drvinfo = arc_emac_get_drvinfo,
|
||||||
|
.get_link = ethtool_op_get_link,
|
||||||
|
};
|
||||||
|
|
||||||
|
#define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK)
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_tx_clean - clears processed by EMAC Tx BDs.
|
||||||
|
* @ndev: Pointer to the network device.
|
||||||
|
*/
|
||||||
|
static void arc_emac_tx_clean(struct net_device *ndev)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
struct net_device_stats *stats = &priv->stats;
|
||||||
|
unsigned int i;
|
||||||
|
|
||||||
|
for (i = 0; i < TX_BD_NUM; i++) {
|
||||||
|
unsigned int *txbd_dirty = &priv->txbd_dirty;
|
||||||
|
struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty];
|
||||||
|
struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty];
|
||||||
|
struct sk_buff *skb = tx_buff->skb;
|
||||||
|
unsigned int info = le32_to_cpu(txbd->info);
|
||||||
|
|
||||||
|
*txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM;
|
||||||
|
|
||||||
|
if ((info & FOR_EMAC) || !txbd->data)
|
||||||
|
break;
|
||||||
|
|
||||||
|
if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) {
|
||||||
|
stats->tx_errors++;
|
||||||
|
stats->tx_dropped++;
|
||||||
|
|
||||||
|
if (info & DEFR)
|
||||||
|
stats->tx_carrier_errors++;
|
||||||
|
|
||||||
|
if (info & LTCL)
|
||||||
|
stats->collisions++;
|
||||||
|
|
||||||
|
if (info & UFLO)
|
||||||
|
stats->tx_fifo_errors++;
|
||||||
|
} else if (likely(info & FIRST_OR_LAST_MASK)) {
|
||||||
|
stats->tx_packets++;
|
||||||
|
stats->tx_bytes += skb->len;
|
||||||
|
}
|
||||||
|
|
||||||
|
dma_unmap_single(&ndev->dev, dma_unmap_addr(&tx_buff, addr),
|
||||||
|
dma_unmap_len(&tx_buff, len), DMA_TO_DEVICE);
|
||||||
|
|
||||||
|
/* return the sk_buff to system */
|
||||||
|
dev_kfree_skb_irq(skb);
|
||||||
|
|
||||||
|
txbd->data = 0;
|
||||||
|
txbd->info = 0;
|
||||||
|
|
||||||
|
if (netif_queue_stopped(ndev))
|
||||||
|
netif_wake_queue(ndev);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_rx - processing of Rx packets.
|
||||||
|
* @ndev: Pointer to the network device.
|
||||||
|
* @budget: How many BDs to process on 1 call.
|
||||||
|
*
|
||||||
|
* returns: Number of processed BDs
|
||||||
|
*
|
||||||
|
* Iterate through Rx BDs and deliver received packages to upper layer.
|
||||||
|
*/
|
||||||
|
static int arc_emac_rx(struct net_device *ndev, int budget)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
unsigned int work_done;
|
||||||
|
|
||||||
|
for (work_done = 0; work_done <= budget; work_done++) {
|
||||||
|
unsigned int *last_rx_bd = &priv->last_rx_bd;
|
||||||
|
struct net_device_stats *stats = &priv->stats;
|
||||||
|
struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd];
|
||||||
|
struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd];
|
||||||
|
unsigned int buflen = EMAC_BUFFER_SIZE;
|
||||||
|
unsigned int pktlen, info = le32_to_cpu(rxbd->info);
|
||||||
|
struct sk_buff *skb;
|
||||||
|
dma_addr_t addr;
|
||||||
|
|
||||||
|
if (unlikely((info & OWN_MASK) == FOR_EMAC))
|
||||||
|
break;
|
||||||
|
|
||||||
|
/* Make a note that we saw a packet at this BD.
|
||||||
|
* So next time, driver starts from this + 1
|
||||||
|
*/
|
||||||
|
*last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM;
|
||||||
|
|
||||||
|
if (unlikely((info & FIRST_OR_LAST_MASK) !=
|
||||||
|
FIRST_OR_LAST_MASK)) {
|
||||||
|
/* We pre-allocate buffers of MTU size so incoming
|
||||||
|
* packets won't be split/chained.
|
||||||
|
*/
|
||||||
|
if (net_ratelimit())
|
||||||
|
netdev_err(ndev, "incomplete packet received\n");
|
||||||
|
|
||||||
|
/* Return ownership to EMAC */
|
||||||
|
rxbd->info = cpu_to_le32(FOR_EMAC | buflen);
|
||||||
|
stats->rx_errors++;
|
||||||
|
stats->rx_length_errors++;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
pktlen = info & LEN_MASK;
|
||||||
|
stats->rx_packets++;
|
||||||
|
stats->rx_bytes += pktlen;
|
||||||
|
skb = rx_buff->skb;
|
||||||
|
skb_put(skb, pktlen);
|
||||||
|
skb->dev = ndev;
|
||||||
|
skb->protocol = eth_type_trans(skb, ndev);
|
||||||
|
|
||||||
|
dma_unmap_single(&ndev->dev, dma_unmap_addr(&rx_buff, addr),
|
||||||
|
dma_unmap_len(&rx_buff, len), DMA_FROM_DEVICE);
|
||||||
|
|
||||||
|
/* Prepare the BD for next cycle */
|
||||||
|
rx_buff->skb = netdev_alloc_skb_ip_align(ndev, buflen);
|
||||||
|
if (unlikely(!rx_buff->skb)) {
|
||||||
|
stats->rx_errors++;
|
||||||
|
/* Because receive_skb is below, increment rx_dropped */
|
||||||
|
stats->rx_dropped++;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* receive_skb only if new skb was allocated to avoid holes */
|
||||||
|
netif_receive_skb(skb);
|
||||||
|
|
||||||
|
addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data,
|
||||||
|
buflen, DMA_FROM_DEVICE);
|
||||||
|
if (dma_mapping_error(&ndev->dev, addr)) {
|
||||||
|
if (net_ratelimit())
|
||||||
|
netdev_err(ndev, "cannot dma map\n");
|
||||||
|
dev_kfree_skb(rx_buff->skb);
|
||||||
|
stats->rx_errors++;
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
dma_unmap_addr_set(&rx_buff, mapping, addr);
|
||||||
|
dma_unmap_len_set(&rx_buff, len, buflen);
|
||||||
|
|
||||||
|
rxbd->data = cpu_to_le32(rx_buff->skb->data);
|
||||||
|
|
||||||
|
/* Make sure pointer to data buffer is set */
|
||||||
|
wmb();
|
||||||
|
|
||||||
|
/* Return ownership to EMAC */
|
||||||
|
rxbd->info = cpu_to_le32(FOR_EMAC | buflen);
|
||||||
|
}
|
||||||
|
|
||||||
|
return work_done;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_poll - NAPI poll handler.
|
||||||
|
* @napi: Pointer to napi_struct structure.
|
||||||
|
* @budget: How many BDs to process on 1 call.
|
||||||
|
*
|
||||||
|
* returns: Number of processed BDs
|
||||||
|
*/
|
||||||
|
static int arc_emac_poll(struct napi_struct *napi, int budget)
|
||||||
|
{
|
||||||
|
struct net_device *ndev = napi->dev;
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
unsigned int work_done;
|
||||||
|
|
||||||
|
arc_emac_tx_clean(ndev);
|
||||||
|
|
||||||
|
work_done = arc_emac_rx(ndev, budget);
|
||||||
|
if (work_done < budget) {
|
||||||
|
napi_complete(napi);
|
||||||
|
arc_reg_or(priv, R_ENABLE, RXINT_MASK);
|
||||||
|
}
|
||||||
|
|
||||||
|
return work_done;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_intr - Global interrupt handler for EMAC.
|
||||||
|
* @irq: irq number.
|
||||||
|
* @dev_instance: device instance.
|
||||||
|
*
|
||||||
|
* returns: IRQ_HANDLED for all cases.
|
||||||
|
*
|
||||||
|
* ARC EMAC has only 1 interrupt line, and depending on bits raised in
|
||||||
|
* STATUS register we may tell what is a reason for interrupt to fire.
|
||||||
|
*/
|
||||||
|
static irqreturn_t arc_emac_intr(int irq, void *dev_instance)
|
||||||
|
{
|
||||||
|
struct net_device *ndev = dev_instance;
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
struct net_device_stats *stats = &priv->stats;
|
||||||
|
unsigned int status;
|
||||||
|
|
||||||
|
status = arc_reg_get(priv, R_STATUS);
|
||||||
|
status &= ~MDIO_MASK;
|
||||||
|
|
||||||
|
/* Reset all flags except "MDIO complete" */
|
||||||
|
arc_reg_set(priv, R_STATUS, status);
|
||||||
|
|
||||||
|
if (status & RXINT_MASK) {
|
||||||
|
if (likely(napi_schedule_prep(&priv->napi))) {
|
||||||
|
arc_reg_clr(priv, R_ENABLE, RXINT_MASK);
|
||||||
|
__napi_schedule(&priv->napi);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (status & ERR_MASK) {
|
||||||
|
/* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding
|
||||||
|
* 8-bit error counter overrun.
|
||||||
|
*/
|
||||||
|
|
||||||
|
if (status & MSER_MASK) {
|
||||||
|
stats->rx_missed_errors += 0x100;
|
||||||
|
stats->rx_errors += 0x100;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (status & RXCR_MASK) {
|
||||||
|
stats->rx_crc_errors += 0x100;
|
||||||
|
stats->rx_errors += 0x100;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (status & RXFR_MASK) {
|
||||||
|
stats->rx_frame_errors += 0x100;
|
||||||
|
stats->rx_errors += 0x100;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (status & RXFL_MASK) {
|
||||||
|
stats->rx_over_errors += 0x100;
|
||||||
|
stats->rx_errors += 0x100;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
return IRQ_HANDLED;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_open - Open the network device.
|
||||||
|
* @ndev: Pointer to the network device.
|
||||||
|
*
|
||||||
|
* returns: 0, on success or non-zero error value on failure.
|
||||||
|
*
|
||||||
|
* This function sets the MAC address, requests and enables an IRQ
|
||||||
|
* for the EMAC device and starts the Tx queue.
|
||||||
|
* It also connects to the phy device.
|
||||||
|
*/
|
||||||
|
static int arc_emac_open(struct net_device *ndev)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
struct phy_device *phy_dev = priv->phy_dev;
|
||||||
|
struct arc_emac_bd *bd;
|
||||||
|
struct sk_buff *skb;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
phy_dev->autoneg = AUTONEG_ENABLE;
|
||||||
|
phy_dev->speed = 0;
|
||||||
|
phy_dev->duplex = 0;
|
||||||
|
phy_dev->advertising = phy_dev->supported;
|
||||||
|
|
||||||
|
if (priv->max_speed > 100) {
|
||||||
|
phy_dev->advertising &= PHY_GBIT_FEATURES;
|
||||||
|
} else if (priv->max_speed <= 100) {
|
||||||
|
phy_dev->advertising &= PHY_BASIC_FEATURES;
|
||||||
|
if (priv->max_speed <= 10) {
|
||||||
|
phy_dev->advertising &= ~SUPPORTED_100baseT_Half;
|
||||||
|
phy_dev->advertising &= ~SUPPORTED_100baseT_Full;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Allocate and set buffers for Rx BD's */
|
||||||
|
bd = priv->rxbd;
|
||||||
|
for (i = 0; i < RX_BD_NUM; i++) {
|
||||||
|
skb = netdev_alloc_skb_ip_align(ndev, EMAC_BUFFER_SIZE);
|
||||||
|
if (unlikely(!skb))
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
priv->rx_buff[i].skb = skb;
|
||||||
|
bd->data = cpu_to_le32(skb->data);
|
||||||
|
|
||||||
|
/* Make sure pointer to data buffer is set */
|
||||||
|
wmb();
|
||||||
|
|
||||||
|
/* Set ownership to EMAC */
|
||||||
|
bd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE);
|
||||||
|
bd++;
|
||||||
|
}
|
||||||
|
|
||||||
|
priv->last_rx_bd = 0;
|
||||||
|
|
||||||
|
/* Clean Tx BD's */
|
||||||
|
memset(priv->txbd, 0, TX_RING_SZ);
|
||||||
|
|
||||||
|
/* Initialize logical address filter */
|
||||||
|
arc_reg_set(priv, R_LAFL, 0);
|
||||||
|
arc_reg_set(priv, R_LAFH, 0);
|
||||||
|
|
||||||
|
/* Set BD ring pointers for device side */
|
||||||
|
arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma);
|
||||||
|
arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma);
|
||||||
|
|
||||||
|
/* Enable interrupts */
|
||||||
|
arc_reg_set(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
|
||||||
|
|
||||||
|
/* Set CONTROL */
|
||||||
|
arc_reg_set(priv, R_CTRL,
|
||||||
|
(RX_BD_NUM << 24) | /* RX BD table length */
|
||||||
|
(TX_BD_NUM << 16) | /* TX BD table length */
|
||||||
|
TXRN_MASK | RXRN_MASK);
|
||||||
|
|
||||||
|
napi_enable(&priv->napi);
|
||||||
|
|
||||||
|
/* Enable EMAC */
|
||||||
|
arc_reg_or(priv, R_CTRL, EN_MASK);
|
||||||
|
|
||||||
|
phy_start_aneg(priv->phy_dev);
|
||||||
|
|
||||||
|
netif_start_queue(ndev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_stop - Close the network device.
|
||||||
|
* @ndev: Pointer to the network device.
|
||||||
|
*
|
||||||
|
* This function stops the Tx queue, disables interrupts and frees the IRQ for
|
||||||
|
* the EMAC device.
|
||||||
|
* It also disconnects the PHY device associated with the EMAC device.
|
||||||
|
*/
|
||||||
|
static int arc_emac_stop(struct net_device *ndev)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
|
||||||
|
napi_disable(&priv->napi);
|
||||||
|
netif_stop_queue(ndev);
|
||||||
|
|
||||||
|
/* Disable interrupts */
|
||||||
|
arc_reg_clr(priv, R_ENABLE, RXINT_MASK | ERR_MASK);
|
||||||
|
|
||||||
|
/* Disable EMAC */
|
||||||
|
arc_reg_clr(priv, R_CTRL, EN_MASK);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_stats - Get system network statistics.
|
||||||
|
* @ndev: Pointer to net_device structure.
|
||||||
|
*
|
||||||
|
* Returns the address of the device statistics structure.
|
||||||
|
* Statistics are updated in interrupt handler.
|
||||||
|
*/
|
||||||
|
static struct net_device_stats *arc_emac_stats(struct net_device *ndev)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
struct net_device_stats *stats = &priv->stats;
|
||||||
|
unsigned long miss, rxerr;
|
||||||
|
u8 rxcrc, rxfram, rxoflow;
|
||||||
|
|
||||||
|
rxerr = arc_reg_get(priv, R_RXERR);
|
||||||
|
miss = arc_reg_get(priv, R_MISS);
|
||||||
|
|
||||||
|
rxcrc = rxerr;
|
||||||
|
rxfram = rxerr >> 8;
|
||||||
|
rxoflow = rxerr >> 16;
|
||||||
|
|
||||||
|
stats->rx_errors += miss;
|
||||||
|
stats->rx_errors += rxcrc + rxfram + rxoflow;
|
||||||
|
|
||||||
|
stats->rx_over_errors += rxoflow;
|
||||||
|
stats->rx_frame_errors += rxfram;
|
||||||
|
stats->rx_crc_errors += rxcrc;
|
||||||
|
stats->rx_missed_errors += miss;
|
||||||
|
|
||||||
|
return stats;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_tx - Starts the data transmission.
|
||||||
|
* @skb: sk_buff pointer that contains data to be Transmitted.
|
||||||
|
* @ndev: Pointer to net_device structure.
|
||||||
|
*
|
||||||
|
* returns: NETDEV_TX_OK, on success
|
||||||
|
* NETDEV_TX_BUSY, if any of the descriptors are not free.
|
||||||
|
*
|
||||||
|
* This function is invoked from upper layers to initiate transmission.
|
||||||
|
*/
|
||||||
|
static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
unsigned int len, *txbd_curr = &priv->txbd_curr;
|
||||||
|
struct net_device_stats *stats = &priv->stats;
|
||||||
|
__le32 *info = &priv->txbd[*txbd_curr].info;
|
||||||
|
dma_addr_t addr;
|
||||||
|
|
||||||
|
if (skb_padto(skb, ETH_ZLEN))
|
||||||
|
return NETDEV_TX_OK;
|
||||||
|
|
||||||
|
len = max_t(unsigned int, ETH_ZLEN, skb->len);
|
||||||
|
|
||||||
|
/* EMAC still holds this buffer in its possession.
|
||||||
|
* CPU must not modify this buffer descriptor
|
||||||
|
*/
|
||||||
|
if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC)) {
|
||||||
|
netif_stop_queue(ndev);
|
||||||
|
return NETDEV_TX_BUSY;
|
||||||
|
}
|
||||||
|
|
||||||
|
addr = dma_map_single(&ndev->dev, (void *)skb->data, len,
|
||||||
|
DMA_TO_DEVICE);
|
||||||
|
|
||||||
|
if (unlikely(dma_mapping_error(&ndev->dev, addr))) {
|
||||||
|
stats->tx_dropped++;
|
||||||
|
stats->tx_errors++;
|
||||||
|
dev_kfree_skb(skb);
|
||||||
|
return NETDEV_TX_OK;
|
||||||
|
}
|
||||||
|
dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], mapping, addr);
|
||||||
|
dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len);
|
||||||
|
|
||||||
|
priv->tx_buff[*txbd_curr].skb = skb;
|
||||||
|
priv->txbd[*txbd_curr].data = cpu_to_le32(skb->data);
|
||||||
|
|
||||||
|
/* Make sure pointer to data buffer is set */
|
||||||
|
wmb();
|
||||||
|
|
||||||
|
*info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len);
|
||||||
|
|
||||||
|
/* Increment index to point to the next BD */
|
||||||
|
*txbd_curr = (*txbd_curr + 1) % TX_BD_NUM;
|
||||||
|
|
||||||
|
/* Get "info" of the next BD */
|
||||||
|
info = &priv->txbd[*txbd_curr].info;
|
||||||
|
|
||||||
|
/* Check if if Tx BD ring is full - next BD is still owned by EMAC */
|
||||||
|
if (unlikely((le32_to_cpu(*info) & OWN_MASK) == FOR_EMAC))
|
||||||
|
netif_stop_queue(ndev);
|
||||||
|
|
||||||
|
arc_reg_set(priv, R_STATUS, TXPL_MASK);
|
||||||
|
|
||||||
|
skb_tx_timestamp(skb);
|
||||||
|
|
||||||
|
return NETDEV_TX_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_emac_set_address - Set the MAC address for this device.
|
||||||
|
* @ndev: Pointer to net_device structure.
|
||||||
|
* @p: 6 byte Address to be written as MAC address.
|
||||||
|
*
|
||||||
|
* This function copies the HW address from the sockaddr structure to the
|
||||||
|
* net_device structure and updates the address in HW.
|
||||||
|
*
|
||||||
|
* returns: -EBUSY if the net device is busy or 0 if the address is set
|
||||||
|
* successfully.
|
||||||
|
*/
|
||||||
|
static int arc_emac_set_address(struct net_device *ndev, void *p)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
struct sockaddr *addr = p;
|
||||||
|
unsigned int addr_low, addr_hi;
|
||||||
|
|
||||||
|
if (netif_running(ndev))
|
||||||
|
return -EBUSY;
|
||||||
|
|
||||||
|
if (!is_valid_ether_addr(addr->sa_data))
|
||||||
|
return -EADDRNOTAVAIL;
|
||||||
|
|
||||||
|
memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len);
|
||||||
|
|
||||||
|
addr_low = le32_to_cpu(*(__le32 *) &ndev->dev_addr[0]);
|
||||||
|
addr_hi = le16_to_cpu(*(__le16 *) &ndev->dev_addr[4]);
|
||||||
|
|
||||||
|
arc_reg_set(priv, R_ADDRL, addr_low);
|
||||||
|
arc_reg_set(priv, R_ADDRH, addr_hi);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct net_device_ops arc_emac_netdev_ops = {
|
||||||
|
.ndo_open = arc_emac_open,
|
||||||
|
.ndo_stop = arc_emac_stop,
|
||||||
|
.ndo_start_xmit = arc_emac_tx,
|
||||||
|
.ndo_set_mac_address = arc_emac_set_address,
|
||||||
|
.ndo_get_stats = arc_emac_stats,
|
||||||
|
};
|
||||||
|
|
||||||
|
static int arc_emac_probe(struct platform_device *pdev)
|
||||||
|
{
|
||||||
|
struct resource res_regs, res_irq;
|
||||||
|
struct device_node *phy_node;
|
||||||
|
struct arc_emac_priv *priv;
|
||||||
|
struct net_device *ndev;
|
||||||
|
const char *mac_addr;
|
||||||
|
unsigned int id, clock_frequency;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
if (!pdev->dev.of_node)
|
||||||
|
return -ENODEV;
|
||||||
|
|
||||||
|
/* Get PHY from device tree */
|
||||||
|
phy_node = of_parse_phandle(pdev->dev.of_node, "phy", 0);
|
||||||
|
if (!phy_node) {
|
||||||
|
dev_err(&pdev->dev, "failed to retrieve phy description from device tree\n");
|
||||||
|
return -ENODEV;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get EMAC registers base address from device tree */
|
||||||
|
err = of_address_to_resource(pdev->dev.of_node, 0, &res_regs);
|
||||||
|
if (err) {
|
||||||
|
dev_err(&pdev->dev, "failed to retrieve registers base from device tree\n");
|
||||||
|
return -ENODEV;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get CPU clock frequency from device tree */
|
||||||
|
if (of_property_read_u32(pdev->dev.of_node, "clock-frequency",
|
||||||
|
&clock_frequency)) {
|
||||||
|
dev_err(&pdev->dev, "failed to retrieve <clock-frequency> from device tree\n");
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get IRQ from device tree */
|
||||||
|
err = of_irq_to_resource(pdev->dev.of_node, 0, &res_irq);
|
||||||
|
if (!err) {
|
||||||
|
dev_err(&pdev->dev, "failed to retrieve <irq> value from device tree\n");
|
||||||
|
return -ENODEV;
|
||||||
|
}
|
||||||
|
|
||||||
|
ndev = alloc_etherdev(sizeof(struct arc_emac_priv));
|
||||||
|
if (!ndev)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
SET_NETDEV_DEV(ndev, &pdev->dev);
|
||||||
|
|
||||||
|
ndev->netdev_ops = &arc_emac_netdev_ops;
|
||||||
|
ndev->ethtool_ops = &arc_emac_ethtool_ops;
|
||||||
|
ndev->watchdog_timeo = TX_TIMEOUT;
|
||||||
|
/* FIXME :: no multicast support yet */
|
||||||
|
ndev->flags &= ~IFF_MULTICAST;
|
||||||
|
|
||||||
|
priv = netdev_priv(ndev);
|
||||||
|
priv->dev = &pdev->dev;
|
||||||
|
priv->ndev = ndev;
|
||||||
|
|
||||||
|
priv->regs = devm_ioremap_resource(&pdev->dev, &res_regs);
|
||||||
|
if (IS_ERR(priv->regs)) {
|
||||||
|
err = PTR_ERR(priv->regs);
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
dev_dbg(&pdev->dev, "Registers base address is 0x%p\n", priv->regs);
|
||||||
|
|
||||||
|
id = arc_reg_get(priv, R_ID);
|
||||||
|
|
||||||
|
/* Check for EMAC revision 5 or 7, magic number */
|
||||||
|
if (!(id == 0x0005fd02 || id == 0x0007fd02)) {
|
||||||
|
dev_err(&pdev->dev, "ARC EMAC not detected, id=0x%x\n", id);
|
||||||
|
err = -ENODEV;
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
dev_info(&pdev->dev, "ARC EMAC detected with id: 0x%x\n", id);
|
||||||
|
|
||||||
|
/* Set poll rate so that it polls every 1 ms */
|
||||||
|
arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000);
|
||||||
|
|
||||||
|
/* Get max speed of operation from device tree */
|
||||||
|
if (of_property_read_u32(pdev->dev.of_node, "max-speed",
|
||||||
|
&priv->max_speed)) {
|
||||||
|
dev_err(&pdev->dev, "failed to retrieve <max-speed> from device tree\n");
|
||||||
|
err = -EINVAL;
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
ndev->irq = res_irq.start;
|
||||||
|
dev_info(&pdev->dev, "IRQ is %d\n", ndev->irq);
|
||||||
|
|
||||||
|
/* Register interrupt handler for device */
|
||||||
|
err = devm_request_irq(&pdev->dev, ndev->irq, arc_emac_intr, 0,
|
||||||
|
ndev->name, ndev);
|
||||||
|
if (err) {
|
||||||
|
dev_err(&pdev->dev, "could not allocate IRQ\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get MAC address from device tree */
|
||||||
|
mac_addr = of_get_mac_address(pdev->dev.of_node);
|
||||||
|
|
||||||
|
if (!mac_addr || !is_valid_ether_addr(mac_addr))
|
||||||
|
eth_hw_addr_random(ndev);
|
||||||
|
else
|
||||||
|
memcpy(ndev->dev_addr, mac_addr, ETH_ALEN);
|
||||||
|
|
||||||
|
dev_info(&pdev->dev, "MAC address is now %pM\n", ndev->dev_addr);
|
||||||
|
|
||||||
|
/* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */
|
||||||
|
priv->rxbd = dmam_alloc_coherent(&pdev->dev, RX_RING_SZ + TX_RING_SZ,
|
||||||
|
&priv->rxbd_dma, GFP_KERNEL);
|
||||||
|
|
||||||
|
if (!priv->rxbd) {
|
||||||
|
dev_err(&pdev->dev, "failed to allocate data buffers\n");
|
||||||
|
err = -ENOMEM;
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
priv->txbd = priv->rxbd + RX_BD_NUM;
|
||||||
|
|
||||||
|
priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ;
|
||||||
|
dev_dbg(&pdev->dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n",
|
||||||
|
(unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma);
|
||||||
|
|
||||||
|
err = arc_mdio_probe(pdev, priv);
|
||||||
|
if (err) {
|
||||||
|
dev_err(&pdev->dev, "failed to probe MII bus\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
priv->phy_dev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0,
|
||||||
|
PHY_INTERFACE_MODE_MII);
|
||||||
|
if (!priv->phy_dev) {
|
||||||
|
dev_err(&pdev->dev, "of_phy_connect() failed\n");
|
||||||
|
err = -ENODEV;
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
dev_info(&pdev->dev, "connected to %s phy with id 0x%x\n",
|
||||||
|
priv->phy_dev->drv->name, priv->phy_dev->phy_id);
|
||||||
|
|
||||||
|
netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT);
|
||||||
|
|
||||||
|
err = register_netdev(ndev);
|
||||||
|
if (err) {
|
||||||
|
netif_napi_del(&priv->napi);
|
||||||
|
dev_err(&pdev->dev, "failed to register network device\n");
|
||||||
|
goto out;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
out:
|
||||||
|
free_netdev(ndev);
|
||||||
|
return err;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int arc_emac_remove(struct platform_device *pdev)
|
||||||
|
{
|
||||||
|
struct net_device *ndev = platform_get_drvdata(pdev);
|
||||||
|
struct arc_emac_priv *priv = netdev_priv(ndev);
|
||||||
|
|
||||||
|
phy_disconnect(priv->phy_dev);
|
||||||
|
priv->phy_dev = NULL;
|
||||||
|
arc_mdio_remove(priv);
|
||||||
|
unregister_netdev(ndev);
|
||||||
|
netif_napi_del(&priv->napi);
|
||||||
|
free_netdev(ndev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct of_device_id arc_emac_dt_ids[] = {
|
||||||
|
{ .compatible = "snps,arc-emac" },
|
||||||
|
{ /* Sentinel */ }
|
||||||
|
};
|
||||||
|
MODULE_DEVICE_TABLE(of, arc_emac_dt_ids);
|
||||||
|
|
||||||
|
static struct platform_driver arc_emac_driver = {
|
||||||
|
.probe = arc_emac_probe,
|
||||||
|
.remove = arc_emac_remove,
|
||||||
|
.driver = {
|
||||||
|
.name = DRV_NAME,
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
.of_match_table = arc_emac_dt_ids,
|
||||||
|
},
|
||||||
|
};
|
||||||
|
|
||||||
|
module_platform_driver(arc_emac_driver);
|
||||||
|
|
||||||
|
MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>");
|
||||||
|
MODULE_DESCRIPTION("ARC EMAC driver");
|
||||||
|
MODULE_LICENSE("GPL");
|
||||||
|
|
@ -0,0 +1,152 @@
|
||||||
|
/*
|
||||||
|
* Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com)
|
||||||
|
*
|
||||||
|
* MDIO implementation for ARC EMAC
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <linux/delay.h>
|
||||||
|
#include <linux/of_mdio.h>
|
||||||
|
#include <linux/platform_device.h>
|
||||||
|
|
||||||
|
#include "emac.h"
|
||||||
|
|
||||||
|
/* Number of seconds we wait for "MDIO complete" flag to appear */
|
||||||
|
#define ARC_MDIO_COMPLETE_POLL_COUNT 1
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_mdio_complete_wait - Waits until MDIO transaction is completed.
|
||||||
|
* @priv: Pointer to ARC EMAC private data structure.
|
||||||
|
*
|
||||||
|
* returns: 0 on success, -ETIMEDOUT on a timeout.
|
||||||
|
*/
|
||||||
|
static int arc_mdio_complete_wait(struct arc_emac_priv *priv)
|
||||||
|
{
|
||||||
|
unsigned int i;
|
||||||
|
|
||||||
|
for (i = 0; i < ARC_MDIO_COMPLETE_POLL_COUNT * 40; i++) {
|
||||||
|
unsigned int status = arc_reg_get(priv, R_STATUS);
|
||||||
|
|
||||||
|
status &= MDIO_MASK;
|
||||||
|
|
||||||
|
if (status) {
|
||||||
|
/* Reset "MDIO complete" flag */
|
||||||
|
arc_reg_set(priv, R_STATUS, status);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
msleep(25);
|
||||||
|
}
|
||||||
|
|
||||||
|
return -ETIMEDOUT;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_mdio_read - MDIO interface read function.
|
||||||
|
* @bus: Pointer to MII bus structure.
|
||||||
|
* @phy_addr: Address of the PHY device.
|
||||||
|
* @reg_num: PHY register to read.
|
||||||
|
*
|
||||||
|
* returns: The register contents on success, -ETIMEDOUT on a timeout.
|
||||||
|
*
|
||||||
|
* Reads the contents of the requested register from the requested PHY
|
||||||
|
* address.
|
||||||
|
*/
|
||||||
|
static int arc_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = bus->priv;
|
||||||
|
unsigned int value;
|
||||||
|
int error;
|
||||||
|
|
||||||
|
arc_reg_set(priv, R_MDIO,
|
||||||
|
0x60020000 | (phy_addr << 23) | (reg_num << 18));
|
||||||
|
|
||||||
|
error = arc_mdio_complete_wait(priv);
|
||||||
|
if (error < 0)
|
||||||
|
return error;
|
||||||
|
|
||||||
|
value = arc_reg_get(priv, R_MDIO) & 0xffff;
|
||||||
|
|
||||||
|
dev_dbg(priv->dev, "arc_mdio_read(phy_addr=%i, reg_num=%x) = %x\n",
|
||||||
|
phy_addr, reg_num, value);
|
||||||
|
|
||||||
|
return value;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_mdio_write - MDIO interface write function.
|
||||||
|
* @bus: Pointer to MII bus structure.
|
||||||
|
* @phy_addr: Address of the PHY device.
|
||||||
|
* @reg_num: PHY register to write to.
|
||||||
|
* @value: Value to be written into the register.
|
||||||
|
*
|
||||||
|
* returns: 0 on success, -ETIMEDOUT on a timeout.
|
||||||
|
*
|
||||||
|
* Writes the value to the requested register.
|
||||||
|
*/
|
||||||
|
static int arc_mdio_write(struct mii_bus *bus, int phy_addr,
|
||||||
|
int reg_num, u16 value)
|
||||||
|
{
|
||||||
|
struct arc_emac_priv *priv = bus->priv;
|
||||||
|
|
||||||
|
dev_dbg(priv->dev,
|
||||||
|
"arc_mdio_write(phy_addr=%i, reg_num=%x, value=%x)\n",
|
||||||
|
phy_addr, reg_num, value);
|
||||||
|
|
||||||
|
arc_reg_set(priv, R_MDIO,
|
||||||
|
0x50020000 | (phy_addr << 23) | (reg_num << 18) | value);
|
||||||
|
|
||||||
|
return arc_mdio_complete_wait(priv);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_mdio_probe - MDIO probe function.
|
||||||
|
* @pdev: Pointer to platform device.
|
||||||
|
* @priv: Pointer to ARC EMAC private data structure.
|
||||||
|
*
|
||||||
|
* returns: 0 on success, -ENOMEM when mdiobus_alloc
|
||||||
|
* (to allocate memory for MII bus structure) fails.
|
||||||
|
*
|
||||||
|
* Sets up and registers the MDIO interface.
|
||||||
|
*/
|
||||||
|
int arc_mdio_probe(struct platform_device *pdev, struct arc_emac_priv *priv)
|
||||||
|
{
|
||||||
|
struct mii_bus *bus;
|
||||||
|
int error;
|
||||||
|
|
||||||
|
bus = mdiobus_alloc();
|
||||||
|
if (!bus)
|
||||||
|
return -ENOMEM;
|
||||||
|
|
||||||
|
priv->bus = bus;
|
||||||
|
bus->priv = priv;
|
||||||
|
bus->parent = priv->dev;
|
||||||
|
bus->name = "Synopsys MII Bus",
|
||||||
|
bus->read = &arc_mdio_read;
|
||||||
|
bus->write = &arc_mdio_write;
|
||||||
|
|
||||||
|
snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
|
||||||
|
|
||||||
|
error = of_mdiobus_register(bus, pdev->dev.of_node);
|
||||||
|
if (error) {
|
||||||
|
dev_err(priv->dev, "cannot register MDIO bus %s\n", bus->name);
|
||||||
|
mdiobus_free(bus);
|
||||||
|
return error;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* arc_mdio_remove - MDIO remove function.
|
||||||
|
* @priv: Pointer to ARC EMAC private data structure.
|
||||||
|
*
|
||||||
|
* Unregisters the MDIO and frees any associate memory for MII bus.
|
||||||
|
*/
|
||||||
|
int arc_mdio_remove(struct arc_emac_priv *priv)
|
||||||
|
{
|
||||||
|
mdiobus_unregister(priv->bus);
|
||||||
|
mdiobus_free(priv->bus);
|
||||||
|
priv->bus = NULL;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue