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nuttx/drivers/net/lan91c111.c
Juha Niskanen f3490e42c3 Fix typos in comments
2020-03-03 09:11:57 -06:00

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/****************************************************************************
* drivers/net/lan91c111.c
*
* Copyright (C) 2018 Pinecone Inc. All rights reserved.
* Author: Xiang Xiao <xiaoxiang@pinecone.net>
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <assert.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/arch.h>
#include <nuttx/irq.h>
#include <nuttx/kmalloc.h>
#include <nuttx/wdog.h>
#include <nuttx/wqueue.h>
#include <nuttx/net/arp.h>
#include <nuttx/net/lan91c111.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/pkt.h>
#include "lan91c111.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Work queue support is required. */
#if !defined(CONFIG_SCHED_WORKQUEUE)
# error Work queue support is required in this configuration (CONFIG_SCHED_WORKQUEUE)
#endif
/* The low priority work queue is preferred. If it is not enabled, LPWORK
* will be the same as HPWORK.
*
* NOTE: However, the network should NEVER run on the high priority work
* queue! That queue is intended only to service short back end interrupt
* processing that never suspends. Suspending the high priority work queue
* may bring the system to its knees!
*/
#define LAN91C111_WORK LPWORK
#ifdef CONFIG_NET_DUMPPACKET
# define lan91c111_dumppacket lib_dumpbuffer
#else
# define lan91c111_dumppacket(m, b, l)
#endif
/* TX poll delay = 1 seconds. CLK_TCK is the number of clock ticks per second */
#define LAN91C111_WDDELAY (1*CLK_TCK)
/* MII busy delay = 1 microsecond */
#define LAN91C111_MIIDELAY 1
/****************************************************************************
* Private Types
****************************************************************************/
/* lan91c111_driver_s encapsulates all state information for a single
* hardware interface
*/
struct lan91c111_driver_s
{
uintptr_t base; /* Base address */
int irq; /* IRQ number */
uint16_t bank; /* Current bank */
WDOG_ID txpoll; /* TX poll timer */
struct work_s irqwork; /* For deferring interrupt work to the work queue */
struct work_s pollwork; /* For deferring poll work to the work queue */
uint8_t pktbuf[MAX_NETDEV_PKTSIZE + 4]; /* +4 due to getregs32/putregs32 */
/* This holds the information visible to the NuttX network */
struct net_driver_s dev; /* Interface understood by the network */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Common TX logic */
static int lan91c111_transmit(FAR struct net_driver_s *dev);
static int lan91c111_txpoll(FAR struct net_driver_s *dev);
/* Interrupt handling */
static void lan91c111_reply(FAR struct net_driver_s *dev);
static void lan91c111_receive(FAR struct net_driver_s *dev);
static void lan91c111_txdone(FAR struct net_driver_s *dev);
static void lan91c111_interrupt_work(FAR void *arg);
static int lan91c111_interrupt(int irq, FAR void *context, FAR void *arg);
/* Watchdog timer expirations */
static void lan91c111_poll_work(FAR void *arg);
static void lan91c111_poll_expiry(int argc, wdparm_t arg, ...);
/* NuttX callback functions */
static int lan91c111_ifup(FAR struct net_driver_s *dev);
static int lan91c111_ifdown(FAR struct net_driver_s *dev);
static void lan91c111_txavail_work(FAR void *arg);
static int lan91c111_txavail(FAR struct net_driver_s *dev);
#if defined(CONFIG_NET_MCASTGROUP) || defined(CONFIG_NET_ICMPv6)
static int lan91c111_addmac(FAR struct net_driver_s *dev,
FAR const uint8_t *mac);
#ifdef CONFIG_NET_MCASTGROUP
static int lan91c111_rmmac(FAR struct net_driver_s *dev,
FAR const uint8_t *mac);
#endif
#ifdef CONFIG_NET_ICMPv6
static void lan91c111_ipv6multicast(FAR struct net_driver_s *dev);
#endif
#endif
#ifdef CONFIG_NETDEV_IOCTL
static int lan91c111_ioctl(FAR struct net_driver_s *dev, int cmd,
unsigned long arg);
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/* MAC register access, assume lock hold by caller */
static uint16_t updatebank(FAR struct lan91c111_driver_s *priv,
uint16_t offset)
{
uint16_t bank = offset >> 8;
if (bank != priv->bank)
{
*(FAR volatile uint16_t *)(priv->base + BSR_REG) = bank;
priv->bank = bank;
}
return offset & 0xff;
}
static uint8_t getreg8(FAR struct lan91c111_driver_s *priv, uint16_t offset)
{
offset = updatebank(priv, offset);
return *(FAR volatile uint8_t *)(priv->base + offset);
}
static uint16_t getreg16(FAR struct lan91c111_driver_s *priv, uint16_t offset)
{
offset = updatebank(priv, offset);
return *(FAR volatile uint16_t *)(priv->base + offset);
}
static void putreg8(FAR struct lan91c111_driver_s *priv,
uint16_t offset, uint8_t value)
{
offset = updatebank(priv, offset);
*(FAR volatile uint8_t *)(priv->base + offset) = value;
}
static void putreg16(FAR struct lan91c111_driver_s *priv,
uint16_t offset, uint16_t value)
{
offset = updatebank(priv, offset);
*(FAR volatile uint16_t *)(priv->base + offset) = value;
}
static void modifyreg16(FAR struct lan91c111_driver_s *priv,
uint16_t offset, uint16_t clearbits,
uint16_t setbits)
{
uint16_t value;
offset = updatebank(priv, offset);
value = *(FAR volatile uint16_t *)(priv->base + offset);
value &= ~clearbits;
value |= setbits;
*(FAR volatile uint16_t *)(priv->base + offset) = value;
}
static void getregs32(FAR struct lan91c111_driver_s *priv,
uint16_t offset, void *value_, size_t length)
{
FAR uint32_t *value = value_;
size_t i;
offset = updatebank(priv, offset);
for (i = 0; i < length; i += sizeof(*value))
{
*value++ = *(FAR volatile uint32_t *)(priv->base + offset);
}
}
static void putregs32(FAR struct lan91c111_driver_s *priv,
uint16_t offset, const void *value_, size_t length)
{
FAR const uint32_t *value = value_;
size_t i;
offset = updatebank(priv, offset);
for (i = 0; i < length; i += sizeof(*value))
{
*(FAR volatile uint32_t *)(priv->base + offset) = *value++;
}
}
static void copyfrom16(FAR struct lan91c111_driver_s *priv,
uint16_t offset, FAR void *value_, size_t length)
{
FAR uint16_t *value = value_;
size_t i;
offset = updatebank(priv, offset);
for (i = 0; i < length; i += sizeof(*value))
{
*value++ = *(FAR volatile uint16_t *)(priv->base + offset);
offset += sizeof(*value);
}
}
static void copyto16(FAR struct lan91c111_driver_s *priv,
uint16_t offset, FAR const void *value_, size_t length)
{
FAR const uint16_t *value = value_;
size_t i;
offset = updatebank(priv, offset);
for (i = 0; i < length; i += sizeof(*value))
{
*(FAR volatile uint16_t *)(priv->base + offset) = *value++;
offset += sizeof(*value);
}
}
/* PHY register access, assume lock hold by caller */
static void outmii(FAR struct lan91c111_driver_s *priv,
uint32_t value, size_t bits)
{
uint32_t mask;
uint16_t mii;
mii = getreg16(priv, MII_REG);
mii &= ~MII_MCLK;
mii |= MII_MDOE;
for (mask = 1 << (bits - 1); mask; mask >>= 1)
{
if (value & mask)
{
mii |= MII_MDO;
}
else
{
mii &= ~MII_MDO;
}
putreg16(priv, MII_REG, mii);
up_udelay(LAN91C111_MIIDELAY);
putreg16(priv, MII_REG, mii | MII_MCLK);
up_udelay(LAN91C111_MIIDELAY);
}
}
static uint32_t inmii(FAR struct lan91c111_driver_s *priv, size_t bits)
{
uint32_t value = 0;
uint32_t mask;
uint16_t mii;
mii = getreg16(priv, MII_REG);
mii &= ~(MII_MCLK | MII_MDOE);
for (mask = 1 << (bits - 1); mask; mask >>= 1)
{
putreg16(priv, MII_REG, mii);
up_udelay(LAN91C111_MIIDELAY);
if (getreg16(priv, MII_REG) & MII_MDI)
{
value |= mask;
}
putreg16(priv, MII_REG, mii | MII_MCLK);
up_udelay(LAN91C111_MIIDELAY);
}
return value;
}
static uint16_t getphy(FAR struct lan91c111_driver_s *priv, uint8_t offset)
{
uint16_t value;
/* Idle - 32 ones */
outmii(priv, 0xffffffff, 32);
/* Start(01) + read(10) + addr(00000) + offset(5bits) */
outmii(priv, 6 << 10 | 0 << 5 | offset, 14);
/* Turnaround(2bits) + value(16bits) */
value = inmii(priv, 18); /* Cut the high 2bits */
/* Return to idle state */
modifyreg16(priv, MII_REG, MII_MCLK | MII_MDOE | MII_MDO, 0);
return value;
}
static void putphy(FAR struct lan91c111_driver_s *priv,
uint8_t offset, uint16_t value)
{
/* Idle - 32 ones */
outmii(priv, 0xffffffff, 32);
/* Start(01) + write(01) + addr(00000) + offset(5bits) + turnaround(10) +
* value(16bits)
*/
outmii(priv, 5 << 28 | 0 << 23 | offset << 18 | 2 << 16 | value, 32);
/* Return to idle state */
modifyreg16(priv, MII_REG, MII_MCLK | MII_MDOE | MII_MDO, 0);
}
/* Small utility function, assume lock hold by caller */
static void lan91c111_command_mmu(FAR struct lan91c111_driver_s *priv,
uint16_t cmd)
{
putreg16(priv, MMU_CMD_REG, cmd);
while (getreg16(priv, MMU_CMD_REG) & MC_BUSY)
{
/* Wait until the current command finish */
}
}
/****************************************************************************
* Name: lan91c111_transmit
*
* Description:
* Start hardware transmission. Called either from the txdone interrupt
* handling or from watchdog based polling.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int lan91c111_transmit(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
uint32_t pages;
uint8_t packet;
/* Verify that the hardware is ready to send another packet. If we get
* here, then we are committed to sending a packet; Higher level logic
* must have assured that there is no transmission in progress.
*/
/* The MMU wants the number of pages to be the number of 256 bytes
* 'pages', minus 1 (since a packet can't ever have 0 pages :))
*
* Packet size for allocating is data length +6 (for additional status
* words, length and ctl)
*
* If odd size then last byte is included in ctl word.
*/
pages = ((dev->d_len & ~1) + 6) >> 8;
while (1)
{
/* Release the received packet if no free memory */
if (!(getreg16(priv, MIR_REG) & MIR_FREE_MASK) &&
!(getreg8(priv, RXFIFO_REG) & RXFIFO_REMPTY))
{
lan91c111_command_mmu(priv, MC_RELEASE);
NETDEV_RXERRORS(dev);
}
/* Now, try to allocate the memory */
lan91c111_command_mmu(priv, MC_ALLOC | pages);
while (1) /* Then wait the response */
{
if (getreg8(priv, INT_REG) & IM_ALLOC_INT)
{
/* Acknowledge the interrupt */
putreg8(priv, INT_REG, IM_ALLOC_INT);
break;
}
}
/* Check the result */
packet = getreg8(priv, AR_REG);
if (!(packet & AR_FAILED))
{
break; /* Got the packet */
}
}
/* Increment statistics */
lan91c111_dumppacket("transmit", dev->d_buf, dev->d_len);
NETDEV_TXPACKETS(dev);
/* Send the packet: address=dev->d_buf, length=dev->d_len */
/* Point to the beginning of the packet */
putreg8(priv, PN_REG, packet);
putreg16(priv, PTR_REG, PTR_AUTOINC);
/* Send the status(set to zeros) and the packet
* length(+6 for status, length and ctl byte)
*/
putreg16(priv, DATA_REG, 0);
putreg16(priv, DATA_REG, dev->d_len + 6);
/* Append ctl byte */
dev->d_buf[dev->d_len] = TC_ODD;
dev->d_buf[dev->d_len + 1] = 0x00;
/* Copy and enqueue the buffer */
putregs32(priv, DATA_REG, dev->d_buf, dev->d_len + 2);
lan91c111_command_mmu(priv, MC_ENQUEUE);
/* Assume the transmission no error, otherwise
* revert the increment in lan91c111_txdone.
*/
NETDEV_TXDONE(dev);
return OK;
}
/****************************************************************************
* Name: lan91c111_txpoll
*
* Description:
* The transmitter is available, check if the network has any outgoing
* packets ready to send. This is a callback from devif_poll().
* devif_poll() may be called:
*
* 1. When the preceding TX packet send is complete,
* 2. When the preceding TX packet send fail
* 3. During normal TX polling
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int lan91c111_txpoll(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
/* If the polling resulted in data that should be sent out on the network,
* the field d_len is set to a value > 0.
*/
if (dev->d_len > 0)
{
/* Look up the destination MAC address and add it to the Ethernet
* header.
*/
#ifdef CONFIG_NET_IPv4
if (IFF_IS_IPv4(dev->d_flags))
{
arp_out(dev);
}
#endif /* CONFIG_NET_IPv4 */
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv6(dev->d_flags))
{
neighbor_out(dev);
}
#endif /* CONFIG_NET_IPv6 */
if (!devif_loopback(dev))
{
/* Send the packet */
lan91c111_transmit(dev);
/* Check if there is room in the device to hold another packet. If
* not, return a non-zero value to terminate the poll.
*/
return !(getreg16(priv, MIR_REG) & MIR_FREE_MASK);
}
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
/****************************************************************************
* Name: lan91c111_reply
*
* Description:
* After a packet has been received and dispatched to the network, it
* may return with an outgoing packet. This function checks for
* that case and performs the transmission if necessary.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static void lan91c111_reply(FAR struct net_driver_s *dev)
{
/* If the packet dispatch resulted in data that should be sent out on the
* network, the field d_len will set to a value > 0.
*/
if (dev->d_len > 0)
{
/* Update the Ethernet header with the correct MAC address */
#ifdef CONFIG_NET_IPv4
if (IFF_IS_IPv4(dev->d_flags))
{
arp_out(dev);
}
#endif
#ifdef CONFIG_NET_IPv6
if (IFF_IS_IPv6(dev->d_flags))
{
neighbor_out(dev);
}
#endif
/* And send the packet */
lan91c111_transmit(dev);
}
}
/****************************************************************************
* Name: lan91c111_receive
*
* Description:
* An interrupt was received indicating the availability of a new RX packet
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static void lan91c111_receive(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
FAR struct eth_hdr_s *eth = (FAR struct eth_hdr_s *)dev->d_buf;
uint16_t status;
uint16_t length;
/* If the RX FIFO is empty then nothing to do */
if (getreg8(priv, RXFIFO_REG) & RXFIFO_REMPTY)
{
return;
}
/* Read from start of packet */
putreg16(priv, PTR_REG, PTR_RCV | PTR_AUTOINC | PTR_READ);
/* Check for errors and update statistics */
status = getreg16(priv, DATA_REG);
if (status & RS_ERRORS)
{
lan91c111_command_mmu(priv, MC_RELEASE);
NETDEV_RXERRORS(dev);
return;
}
/* Check if the packet is a valid size for the network buffer
* configuration.
*/
length = getreg16(priv, DATA_REG);
length &= 0x07ff; /* Mask off top bits */
/* Remove the header and tail space */
length -= status & RS_ODDFRAME ? 5 : 6;
if (length < ETH_HDRLEN || length > MAX_NETDEV_PKTSIZE)
{
lan91c111_command_mmu(priv, MC_RELEASE);
NETDEV_RXERRORS(dev);
return;
}
/* Copy the data from the hardware to dev->d_buf. Set
* amount of data in dev->d_len
*/
getregs32(priv, DATA_REG, dev->d_buf, length);
dev->d_len = length;
lan91c111_command_mmu(priv, MC_RELEASE);
lan91c111_dumppacket("receive", dev->d_buf, dev->d_len);
NETDEV_RXPACKETS(dev);
#ifdef CONFIG_NET_PKT
/* When packet sockets are enabled, feed the frame into the packet tap */
pkt_input(dev);
#endif
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv4
if (eth->type == HTONS(ETHTYPE_IP))
{
ninfo("IPv4 frame\n");
NETDEV_RXIPV4(dev);
/* Handle ARP on input, then dispatch IPv4 packet to the network
* layer.
*/
arp_ipin(dev);
ipv4_input(dev);
/* Check for a reply to the IPv4 packet */
lan91c111_reply(dev);
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (eth->type == HTONS(ETHTYPE_IP6))
{
ninfo("IPv6 frame\n");
NETDEV_RXIPV6(dev);
/* Dispatch IPv6 packet to the network layer */
ipv6_input(dev);
/* Check for a reply to the IPv6 packet */
lan91c111_reply(dev);
}
else
#endif
#ifdef CONFIG_NET_ARP
if (eth->type == htons(ETHTYPE_ARP))
{
ninfo("ARP frame\n");
NETDEV_RXARP(dev);
/* Dispatch ARP packet to the network layer */
arp_arpin(dev);
/* Check for a reply to the ARP packet */
lan91c111_reply(dev);
}
else
#endif
{
NETDEV_RXDROPPED(dev);
}
}
/****************************************************************************
* Name: lan91c111_txdone
*
* Description:
* An interrupt was received indicating that the last TX packet(s) is done
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static void lan91c111_txdone(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
uint16_t status;
uint8_t packet;
/* If the TX FIFO is empty then nothing to do */
packet = getreg8(priv, TXFIFO_REG);
if (packet & TXFIFO_TEMPTY)
{
return;
}
/* Read the status word and free this packet */
putreg8(priv, PN_REG, packet);
putreg16(priv, PTR_REG, PTR_AUTOINC | PTR_READ);
status = getreg16(priv, DATA_REG);
lan91c111_command_mmu(priv, MC_FREEPKT);
/* Check for errors and update statistics */
if (status & ES_ERRORS)
{
/* Re-enable transmit */
modifyreg16(priv, TCR_REG, 0, TCR_ENABLE);
#ifdef CONFIG_NETDEV_STATISTICS
/* Revert the increment in lan91c111_transmit */
dev->d_statistics.tx_done--;
#endif
NETDEV_TXERRORS(dev);
}
else
{
DEBUGASSERT(0);
}
}
/****************************************************************************
* Name: lan91c111_phy_notify
*
* Description:
* An interrupt was received indicating that the phy has status change
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static void lan91c111_phy_notify(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
do
{
if (getphy(priv, MII_MSR) & MII_MSR_LINKSTATUS)
{
if (getphy(priv, MII_LPA) & MII_LPA_FULL)
{
modifyreg16(priv, TCR_REG, 0, TCR_SWFDUP);
}
else
{
modifyreg16(priv, TCR_REG, TCR_SWFDUP, 0);
}
netdev_carrier_on(dev);
}
else
{
netdev_carrier_off(dev);
}
}
while (getphy(priv, PHY_INT_REG) & PHY_INT_INT);
}
/****************************************************************************
* Name: lan91c111_interrupt_work
*
* Description:
* Perform interrupt related work from the worker thread
*
* Parameters:
* arg - The argument passed when work_queue() was called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* Runs on a worker thread.
*
****************************************************************************/
static void lan91c111_interrupt_work(FAR void *arg)
{
FAR struct net_driver_s *dev = arg;
FAR struct lan91c111_driver_s *priv = dev->d_private;
uint8_t status;
/* Lock the network and serialize driver operations if necessary.
* NOTE: Serialization is only required in the case where the driver work
* is performed on an LP worker thread and where more than one LP worker
* thread has been configured.
*/
net_lock();
/* Process pending Ethernet interrupts */
while (1)
{
/* Get interrupt status bits */
status = getreg8(priv, INT_REG);
status &= getreg8(priv, IM_REG);
if (!status)
{
break;
}
/* Handle interrupts according to status bit settings */
/* Check if we received an incoming packet, if so, call lan91c111_receive() */
if (status & IM_RCV_INT)
{
lan91c111_receive(dev);
}
if (status & IM_RX_OVRN_INT)
{
NETDEV_RXERRORS(dev);
}
/* Check if a packet transmission just completed. If so, call lan91c111_txdone. */
if (status & IM_TX_INT)
{
lan91c111_txdone(dev);
}
/* Check if we have the phy interrupt, if so, call lan91c111_phy_notify() */
if (status & IM_MDINT)
{
lan91c111_phy_notify(dev);
}
/* Clear interrupt status bits */
putreg8(priv, INT_REG, status);
/* In any event, poll the network for new TX data */
if (getreg16(priv, MIR_REG) & MIR_FREE_MASK)
{
devif_poll(dev, lan91c111_txpoll);
}
}
net_unlock();
/* Re-enable Ethernet interrupts */
up_enable_irq(priv->irq);
}
/****************************************************************************
* Name: lan91c111_interrupt
*
* Description:
* Hardware interrupt handler
*
* Parameters:
* irq - Number of the IRQ that generated the interrupt
* context - Interrupt register state save info (architecture-specific)
*
* Returned Value:
* OK on success
*
* Assumptions:
* Runs in the context of a the Ethernet interrupt handler. Local
* interrupts are disabled by the interrupt logic.
*
****************************************************************************/
static int lan91c111_interrupt(int irq, FAR void *context, FAR void *arg)
{
FAR struct net_driver_s *dev = arg;
FAR struct lan91c111_driver_s *priv = dev->d_private;
/* Disable further Ethernet interrupts. */
up_disable_irq(priv->irq);
/* Schedule to perform the interrupt processing on the worker thread. */
work_queue(LAN91C111_WORK, &priv->irqwork, lan91c111_interrupt_work,
dev, 0);
return OK;
}
/****************************************************************************
* Name: lan91c111_poll_work
*
* Description:
* Perform periodic polling from the worker thread
*
* Parameters:
* arg - The argument passed when work_queue() as called.
*
* Returned Value:
* OK on success
*
* Assumptions:
* Run on a work queue thread.
*
****************************************************************************/
static void lan91c111_poll_work(FAR void *arg)
{
FAR struct net_driver_s *dev = arg;
FAR struct lan91c111_driver_s *priv = dev->d_private;
/* Lock the network and serialize driver operations if necessary.
* NOTE: Serialization is only required in the case where the driver work
* is performed on an LP worker thread and where more than one LP worker
* thread has been configured.
*/
net_lock();
/* Perform the poll */
/* Check if there is room in the send another TX packet. We cannot perform
* the TX poll if he are unable to accept another packet for transmission.
*/
if (getreg16(priv, MIR_REG) & MIR_FREE_MASK)
{
/* If so, update TCP timing states and poll the network for new XMIT
* data. Hmmm.. might be bug here. Does this mean if there is a
* transmit in progress, we will missing TCP time state updates?
*/
devif_timer(dev, LAN91C111_WDDELAY, lan91c111_txpoll);
}
/* Setup the watchdog poll timer again */
wd_start(priv->txpoll, LAN91C111_WDDELAY, lan91c111_poll_expiry, 1,
(wdparm_t)dev);
net_unlock();
}
/****************************************************************************
* Name: lan91c111_poll_expiry
*
* Description:
* Periodic timer handler. Called from the timer interrupt handler.
*
* Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
* Assumptions:
* Runs in the context of a the timer interrupt handler. Local
* interrupts are disabled by the interrupt logic.
*
****************************************************************************/
static void lan91c111_poll_expiry(int argc, wdparm_t arg, ...)
{
FAR struct net_driver_s *dev = (FAR struct net_driver_s *)arg;
FAR struct lan91c111_driver_s *priv = dev->d_private;
/* Schedule to perform the interrupt processing on the worker thread. */
work_queue(LAN91C111_WORK, &priv->pollwork, lan91c111_poll_work, dev, 0);
}
/****************************************************************************
* Name: lan91c111_ifup
*
* Description:
* NuttX Callback: Bring up the Ethernet interface when an IP address is
* provided
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int lan91c111_ifup(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
#ifdef CONFIG_NET_IPv4
ninfo("Bringing up: %d.%d.%d.%d\n",
dev->d_ipaddr & 0xff, (dev->d_ipaddr >> 8) & 0xff,
(dev->d_ipaddr >> 16) & 0xff, dev->d_ipaddr >> 24);
#endif
#ifdef CONFIG_NET_IPv6
ninfo("Bringing up: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
dev->d_ipv6addr[0], dev->d_ipv6addr[1], dev->d_ipv6addr[2],
dev->d_ipv6addr[3], dev->d_ipv6addr[4], dev->d_ipv6addr[5],
dev->d_ipv6addr[6], dev->d_ipv6addr[7]);
#endif
net_lock();
/* Initialize PHYs, the Ethernet interface, and setup up Ethernet interrupts */
putreg16(priv, CONFIG_REG, CONFIG_DEFAULT);
putreg16(priv, CTL_REG, CTL_DEFAULT);
putreg16(priv, TCR_REG, TCR_DEFAULT);
putreg16(priv, RCR_REG, RCR_DEFAULT);
putreg16(priv, RPC_REG, RPC_DEFAULT);
putreg8(priv, IM_REG,
IM_MDINT | IM_RX_OVRN_INT | IM_RCV_INT | IM_TX_INT);
putphy(priv, PHY_MASK_REG, /* Interrupts listed here are disabled */
PHY_INT_LOSSSYNC | PHY_INT_CWRD | PHY_INT_SSD | PHY_INT_ESD |
PHY_INT_RPOL | PHY_INT_JAB | PHY_INT_SPDDET | PHY_INT_DPLXDET);
putphy(priv, MII_MCR, MII_MCR_ANENABLE | MII_MCR_ANRESTART);
lan91c111_phy_notify(dev); /* Check the initial phy state */
/* Instantiate the MAC address from dev->d_mac.ether.ether_addr_octet */
copyto16(priv, ADDR0_REG, &dev->d_mac.ether, sizeof(dev->d_mac.ether));
#ifdef CONFIG_NET_ICMPv6
/* Set up IPv6 multicast address filtering */
lan91c111_ipv6multicast(dev);
#endif
/* Set and activate a timer process */
wd_start(priv->txpoll, LAN91C111_WDDELAY, lan91c111_poll_expiry, 1,
(wdparm_t)dev);
net_unlock();
/* Enable the Ethernet interrupt */
up_enable_irq(priv->irq);
return OK;
}
/****************************************************************************
* Name: lan91c111_ifdown
*
* Description:
* NuttX Callback: Stop the interface.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int lan91c111_ifdown(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
irqstate_t flags;
/* Disable the Ethernet interrupt */
flags = enter_critical_section();
up_disable_irq(priv->irq);
/* Cancel the TX poll timer and work */
wd_cancel(priv->txpoll);
work_cancel(LAN91C111_WORK, &priv->irqwork);
work_cancel(LAN91C111_WORK, &priv->pollwork);
/* Put the EMAC in its reset, non-operational state. This should be
* a known configuration that will guarantee the lan91c111_ifup() always
* successfully brings the interface back up.
*/
putreg8(priv, IM_REG, 0);
putreg16(priv, RCR_REG, RCR_CLEAR);
putreg16(priv, TCR_REG, TCR_CLEAR);
putreg16(priv, CTL_REG, CTL_CLEAR);
putreg16(priv, CONFIG_REG, CONFIG_CLEAR);
leave_critical_section(flags);
return OK;
}
/****************************************************************************
* Name: lan91c111_txavail_work
*
* Description:
* Perform an out-of-cycle poll on the worker thread.
*
* Parameters:
* arg - Reference to the NuttX driver state structure (cast to void*)
*
* Returned Value:
* None
*
* Assumptions:
* Runs on a work queue thread.
*
****************************************************************************/
static void lan91c111_txavail_work(FAR void *arg)
{
FAR struct net_driver_s *dev = arg;
FAR struct lan91c111_driver_s *priv = dev->d_private;
/* Lock the network and serialize driver operations if necessary.
* NOTE: Serialization is only required in the case where the driver work
* is performed on an LP worker thread and where more than one LP worker
* thread has been configured.
*/
net_lock();
/* Ignore the notification if the interface is not yet up */
if (IFF_IS_UP(dev->d_flags))
{
/* Check if there is room in the hardware to hold another outgoing
* packet.
*/
if (getreg16(priv, MIR_REG) & MIR_FREE_MASK)
{
/* If so, then poll the network for new XMIT data */
devif_poll(dev, lan91c111_txpoll);
}
}
net_unlock();
}
/****************************************************************************
* Name: lan91c111_txavail
*
* Description:
* Driver callback invoked when new TX data is available. This is a
* stimulus perform an out-of-cycle poll and, thereby, reduce the TX
* latency.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
static int lan91c111_txavail(FAR struct net_driver_s *dev)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
/* Is our single work structure available? It may not be if there are
* pending interrupt actions and we will have to ignore the Tx
* availability action.
*/
if (work_available(&priv->pollwork))
{
/* Schedule to serialize the poll on the worker thread. */
work_queue(LAN91C111_WORK, &priv->pollwork, lan91c111_txavail_work,
dev, 0);
}
return OK;
}
/****************************************************************************
* Name: lan91c111_addmac
*
* Description:
* NuttX Callback: Add the specified MAC address to the hardware multicast
* address filtering
*
* IEEE (CRC32) from http://www.microchip.com/wwwproducts/en/LAN91C111
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be added
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
#if defined(CONFIG_NET_MCASTGROUP) || defined(CONFIG_NET_ICMPv6)
static uint32_t lan91c111_crc32(FAR const uint8_t *src, size_t len)
{
uint32_t crc = 0xffffffff;
uint8_t carry;
uint8_t temp;
size_t i;
size_t j;
for (i = 0; i < len; i++)
{
temp = *src++;
for (j = 0; j < 8; j++)
{
carry = (crc & 0x80000000 ? 1 : 0) ^ (temp & 0x01);
crc <<= 1;
if (carry)
{
crc = (crc ^ 0x04c11db6) | carry;
}
temp >>= 1;
}
}
return crc;
}
static int lan91c111_addmac(FAR struct net_driver_s *dev,
FAR const uint8_t *mac)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
uint16_t off;
uint16_t bit;
uint32_t hash;
/* Calculate Ethernet CRC32 for MAC */
hash = lan91c111_crc32(mac, ETHER_ADDR_LEN);
/* The multicast table is a register array of 4 16-bit registers
* and the hash value is defined as the six most significant bits
* of the CRC of the destination addresses. The two msb's determine
* the register to be used (MCAST1-MCAST4), while the other four
* determine the bit within the register. If the appropriate bit in
* the table is set, the packet is received.
*/
off = (hash >> 29) & 0x06;
bit = (hash >> 26) & 0x0f;
/* Add the MAC address to the hardware multicast routing table */
net_lock();
modifyreg16(priv, MCAST_REG1 + off, 0, 1 << bit);
net_unlock();
return OK;
}
#endif
/****************************************************************************
* Name: lan91c111_rmmac
*
* Description:
* NuttX Callback: Remove the specified MAC address from the hardware
* multicast address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be removed
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
#ifdef CONFIG_NET_MCASTGROUP
static int lan91c111_rmmac(FAR struct net_driver_s *dev,
FAR const uint8_t *mac)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
uint16_t off;
uint16_t bit;
uint32_t hash;
/* Calculate Ethernet CRC32 for MAC */
hash = lan91c111_crc32(mac, ETHER_ADDR_LEN);
/* TODO: since the six most significant bits of the CRC from two
* different destination addresses may have the same value. We
* need a reference count here to avoid clear the bit prematurely.
*/
off = (hash >> 29) & 0x06;
bit = (hash >> 26) & 0x0f;
/* Remove the MAC address from the hardware multicast routing table */
net_lock();
modifyreg16(priv, MCAST_REG1 + off, 1 << bit, 0);
net_unlock();
return OK;
}
#endif
/****************************************************************************
* Name: lan91c111_ipv6multicast
*
* Description:
* Configure the IPv6 multicast MAC address.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* Zero (OK) on success; a negated errno value on failure.
*
****************************************************************************/
#ifdef CONFIG_NET_ICMPv6
static void lan91c111_ipv6multicast(FAR struct net_driver_s *dev)
{
uint16_t tmp16;
uint8_t mac[6];
/* For ICMPv6, we need to add the IPv6 multicast address
*
* For IPv6 multicast addresses, the Ethernet MAC is derived by
* the four low-order octets OR'ed with the MAC 33:33:00:00:00:00,
* so for example the IPv6 address FF02:DEAD:BEEF::1:3 would map
* to the Ethernet MAC address 33:33:00:01:00:03.
*
* NOTES: This appears correct for the ICMPv6 Router Solicitation
* Message, but the ICMPv6 Neighbor Solicitation message seems to
* use 33:33:ff:01:00:03.
*/
mac[0] = 0x33;
mac[1] = 0x33;
tmp16 = dev->d_ipv6addr[6];
mac[2] = 0xff;
mac[3] = tmp16 >> 8;
tmp16 = dev->d_ipv6addr[7];
mac[4] = tmp16 & 0xff;
mac[5] = tmp16 >> 8;
ninfo("IPv6 Multicast: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
lan91c111_addmac(dev, mac);
#ifdef CONFIG_NET_ICMPv6_AUTOCONF
/* Add the IPv6 all link-local nodes Ethernet address. This is the
* address that we expect to receive ICMPv6 Router Advertisement
* packets.
*/
lan91c111_addmac(dev, g_ipv6_ethallnodes.ether_addr_octet);
#endif /* CONFIG_NET_ICMPv6_AUTOCONF */
#ifdef CONFIG_NET_ICMPv6_ROUTER
/* Add the IPv6 all link-local routers Ethernet address. This is the
* address that we expect to receive ICMPv6 Router Solicitation
* packets.
*/
lan91c111_addmac(dev, g_ipv6_ethallrouters.ether_addr_octet);
#endif /* CONFIG_NET_ICMPv6_ROUTER */
}
#endif /* CONFIG_NET_ICMPv6 */
/****************************************************************************
* Name: lan91c111_ioctl
*
* Description:
* Handle network IOCTL commands directed to this device.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* cmd - The IOCTL command
* arg - The argument for the IOCTL command
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
* The network is locked.
*
****************************************************************************/
#ifdef CONFIG_NETDEV_IOCTL
static int lan91c111_ioctl(FAR struct net_driver_s *dev, int cmd,
unsigned long arg)
{
FAR struct lan91c111_driver_s *priv = dev->d_private;
struct mii_ioctl_data_s *req = (void *)arg;
int ret = OK;
net_lock();
/* Decode and dispatch the driver-specific IOCTL command */
switch (cmd)
{
case SIOCGMIIPHY: /* Get MII PHY address */
req->phy_id = 0;
break;
case SIOCGMIIREG: /* Get register from MII PHY */
req->val_out = getphy(priv, req->reg_num);
break;
case SIOCSMIIREG: /* Set register in MII PHY */
putphy(priv, req->reg_num, req->val_in);
break;
default:
nerr("ERROR: Unrecognized IOCTL command: %d\n", command);
ret = -ENOTTY; /* Special return value for this case */
}
net_unlock();
return ret;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lan91c111_initialize
*
* Description:
* Initialize the Ethernet controller and driver
*
* Parameters:
* base - The controller base address
* irq - The controller irq number
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
* Called early in initialization before multi-tasking is initiated.
*
****************************************************************************/
int lan91c111_initialize(uintptr_t base, int irq)
{
FAR struct lan91c111_driver_s *priv;
FAR struct net_driver_s *dev;
uint16_t macrev;
uint32_t phyid;
int ret;
/* Allocate the interface structure */
priv = kmm_zalloc(sizeof(*priv));
if (priv == NULL)
{
return -ENOMEM;
}
dev = &priv->dev;
priv->base = base;
priv->irq = irq;
/* Check if a Ethernet chip is recognized at its I/O base */
macrev = getreg16(priv, REV_REG);
phyid = getphy(priv, MII_PHYID1) << 16;
phyid |= getphy(priv, MII_PHYID2);
ninfo("base: %08x irq: %d rev: %04x phy: %08x\n", base, irq, macrev, phyid);
if ((macrev >> 4 & 0x0f) != CHIP_91111FD || phyid != PHY_LAN83C183)
{
nerr("ERROR: Unsupported LAN91C111's MAC/PHY\n");
ret = -ENODEV;
goto err;
}
/* Attach the IRQ to the driver */
ret = irq_attach(irq, lan91c111_interrupt, dev);
if (ret < 0)
{
/* We could not attach the ISR to the interrupt */
goto err;
}
/* Initialize the driver structure */
dev->d_buf = priv->pktbuf; /* Single packet buffer */
dev->d_ifup = lan91c111_ifup; /* I/F up (new IP address) callback */
dev->d_ifdown = lan91c111_ifdown; /* I/F down callback */
dev->d_txavail = lan91c111_txavail; /* New TX data callback */
#ifdef CONFIG_NET_MCASTGROUP
dev->d_addmac = lan91c111_addmac; /* Add multicast MAC address */
dev->d_rmmac = lan91c111_rmmac; /* Remove multicast MAC address */
#endif
#ifdef CONFIG_NETDEV_IOCTL
dev->d_ioctl = lan91c111_ioctl; /* Handle network IOCTL commands */
#endif
dev->d_private = priv; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for transmissions */
priv->txpoll = wd_create(); /* Create periodic poll timer */
DEBUGASSERT(priv->txpoll != NULL);
/* Put the interface in the down state. This usually amounts to resetting
* the device and/or calling lan91c111_ifdown().
*/
putreg16(priv, RCR_REG, RCR_SOFTRST);
up_udelay(10); /* Pause to make the chip happy */
putreg16(priv, RCR_REG, RCR_CLEAR);
putreg16(priv, CONFIG_REG, CONFIG_CLEAR);
lan91c111_command_mmu(priv, MC_RESET);
putphy(priv, MII_MCR, MII_MCR_RESET);
while (getphy(priv, MII_MCR) & MII_MCR_RESET)
{
/* Loop, reset don't finish yet */
}
/* Read the MAC address from the hardware into dev->d_mac.ether.ether_addr_octet */
copyfrom16(priv, ADDR0_REG, &dev->d_mac.ether, sizeof(dev->d_mac.ether));
/* Register the device with the OS so that socket IOCTLs can be performed */
netdev_register(dev, NET_LL_ETHERNET);
return OK;
err:
kmm_free(priv);
return ret;
}
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