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nuttx/arch/arm/src/sam34/sam_emac.c

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/****************************************************************************
* arch/arm/src/sam34/sam_emac.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* This logic derives from the SAM34D3 Ethernet driver.
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Which used Atmel NoOS sample code for reference (only). That Atmel
* sample code has a BSD compatible license that requires this copyright
* notice:
*
* Copyright (c) 2012, Atmel Corporation
*
* 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 names NuttX nor Atmel 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 <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
#include <debug.h>
#include <wdog.h>
#include <queue.h>
#include <errno.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/kmalloc.h>
#include <nuttx/net/mii.h>
#include <nuttx/net/uip/uip.h>
#include <nuttx/net/uip/uip-arp.h>
#include <nuttx/net/uip/uip-arch.h>
#include "up_arch.h"
#include "up_internal.h"
#include "chip.h"
#include "chip/sam_pinmap.h"
#include "sam_gpio.h"
#include "sam_periphclks.h"
#include "sam_cmcc.h"
#include "sam_emac.h"
#include <arch/board/board.h>
#if defined(CONFIG_NET) && defined(CONFIG_SAM34_EMAC)
/****************************************************************************
* Definitions
****************************************************************************/
/* Configuration ************************************************************/
/* Number of buffer for RX */
#ifndef CONFIG_SAM34_EMAC_NRXBUFFERS
# define CONFIG_SAM34_EMAC_NRXBUFFERS 16
#endif
/* Number of buffer for TX */
#ifndef CONFIG_SAM34_EMAC_NTXBUFFERS
# define CONFIG_SAM34_EMAC_NTXBUFFERS 8
#endif
#undef CONFIG_SAM34_EMAC_NBC
#ifndef CONFIG_SAM34_EMAC_PHYADDR
# error "CONFIG_SAM34_EMAC_PHYADDR must be defined in the NuttX configuration"
#endif
#if !defined(CONFIG_SAM34_EMAC_MII) && !defined(CONFIG_SAM34_EMAC_RMII)
# warning "Neither CONFIG_SAM34_EMAC_MII nor CONFIG_SAM34_EMAC_RMII defined"
#endif
#if defined(CONFIG_SAM34_EMAC_MII) && defined(CONFIG_SAM34_EMAC_RMII)
# error "Both CONFIG_SAM34_EMAC_MII and CONFIG_SAM34_EMAC_RMII defined"
#endif
#ifdef CONFIG_SAM34_EMAC_AUTONEG
# ifndef CONFIG_SAM34_EMAC_PHYSR
# error "CONFIG_SAM34_EMAC_PHYSR must be defined in the NuttX configuration"
# endif
# ifdef CONFIG_SAM34_EMAC_PHYSR_ALTCONFIG
# ifndef CONFIG_SAM34_EMAC_PHYSR_ALTMODE
# error "CONFIG_SAM34_EMAC_PHYSR_ALTMODE must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_10HD
# error "CONFIG_SAM34_EMAC_PHYSR_10HD must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_100HD
# error "CONFIG_SAM34_EMAC_PHYSR_100HD must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_10FD
# error "CONFIG_SAM34_EMAC_PHYSR_10FD must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_100FD
# error "CONFIG_SAM34_EMAC_PHYSR_100FD must be defined in the NuttX configuration"
# endif
# else
# ifndef CONFIG_SAM34_EMAC_PHYSR_SPEED
# error "CONFIG_SAM34_EMAC_PHYSR_SPEED must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_100MBPS
# error "CONFIG_SAM34_EMAC_PHYSR_100MBPS must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_MODE
# error "CONFIG_SAM34_EMAC_PHYSR_MODE must be defined in the NuttX configuration"
# endif
# ifndef CONFIG_SAM34_EMAC_PHYSR_FULLDUPLEX
# error "CONFIG_SAM34_EMAC_PHYSR_FULLDUPLEX must be defined in the NuttX configuration"
# endif
# endif
#endif
/* PHY definitions */
#if defined(CONFIG_ETH0_PHY_DM9161)
# define MII_OUI_MSB 0x0181
# define MII_OUI_LSB 0x2e
#elif defined(CONFIG_ETH0_PHY_LAN8700)
# define MII_OUI_MSB 0x0007
# define MII_OUI_LSB 0x30
#elif defined(CONFIG_ETH0_PHY_KSZ8051)
# define MII_OUI_MSB 0x0022
# define MII_OUI_LSB 0x05
#else
# error EMAC PHY unrecognized
#endif
#ifdef CONFIG_SAM34_EMAC_PHYSR_ALTCONFIG
# define PHYSR_MODE(sr) ((sr) & CONFIG_SAM34_EMAC_PHYSR_ALTMODE)
# define PHYSR_ISMODE(sr,m) (PHYSR_MODE(sr) == (m))
# define PHYSR_IS10HDX(sr) PHYSR_ISMODE(sr,CONFIG_SAM34_EMAC_PHYSR_10HD)
# define PHYSR_IS100HDX(sr) PHYSR_ISMODE(sr,CONFIG_SAM34_EMAC_PHYSR_100HD)
# define PHYSR_IS10FDX(sr) PHYSR_ISMODE(sr,CONFIG_SAM34_EMAC_PHYSR_10FD)
# define PHYSR_IS100FDX(sr) PHYSR_ISMODE(sr,CONFIG_SAM34_EMAC_PHYSR_100FD)
#else
# define PHYSR_MODESPEED (CONFIG_PHYSR_MODE | CONFIG_PHYSR_SPEED)
# define PHYSR_10HDX (0)
# define PHYSR_100HDX (CONFIG_PHYSR_100MBPS)
# define PHYSR_10FDX (CONFIG_PHYSR_FULLDUPLEX)
# define PHYSR_100FDX (CONFIG_PHYSR_FULLDUPLEX | CONFIG_PHYSR_100MBPS)
# define PHYSR_IS10HDX(sr) (((sr) & PHYSR_MODESPEED) == PHYSR_10HDX)
# define PHYSR_IS100HDX(sr) (((sr) & PHYSR_MODESPEED) == PHYSR_100HDX)
# define PHYSR_IS10FDX(sr) (((sr) & PHYSR_MODESPEED) == PHYSR_10FDX)
# define PHYSR_IS100FDX(sr) (((sr) & PHYSR_MODESPEED) == PHYSR_100FDX)
#endif
/* EMAC buffer sizes, number of buffers, and number of descriptors.
*
* REVISIT: The CONFIG_NET_MULTIBUFFER might be useful. It might be possible
* to use this option to send and receive messages directly into the DMA
* buffers, saving a copy. There might be complications on the receiving
* side, however, where buffers may wrap and where the size of the received
* frame will typically be smaller than a full packet.
*/
#ifdef CONFIG_NET_MULTIBUFFER
# error CONFIG_NET_MULTIBUFFER must not be set
#endif
#define EMAC_RX_UNITSIZE 128 /* Fixed size for RX buffer */
#define EMAC_TX_UNITSIZE CONFIG_NET_BUFSIZE /* MAX size for Ethernet packet */
/* We need at least one more free buffer than transmit buffers */
#define SAM_EMAC_NFREEBUFFERS (CONFIG_SAM34_EMAC_NTXBUFFERS+1)
/* Extremely detailed register debug that you would normally never want
* enabled.
*/
#ifndef CONFIG_DEBUG
# undef CONFIG_SAM34_EMAC_REGDEBUG
#endif
#ifdef CONFIG_NET_DUMPPACKET
# define sam_dumppacket(m,a,n) lib_dumpbuffer(m,a,n)
#else
# define sam_dumppacket(m,a,n)
#endif
/* Timing *******************************************************************/
/* TX poll delay = 1 seconds. CLK_TCK is the number of clock ticks per
* second
*/
#define SAM_WDDELAY (1*CLK_TCK)
#define SAM_POLLHSEC (1*2)
/* TX timeout = 1 minute */
#define SAM_TXTIMEOUT (60*CLK_TCK)
/* PHY read/write delays in loop counts */
#define PHY_RETRY_MAX 1000000
/* Helpers ******************************************************************/
/* This is a helper pointer for accessing the contents of the EMAC
* header
*/
#define BUF ((struct uip_eth_hdr *)priv->dev.d_buf)
/****************************************************************************
* Private Types
****************************************************************************/
/* The sam_emac_s encapsulates all state information for the EMAC peripheral */
struct sam_emac_s
{
uint8_t ifup : 1; /* true:ifup false:ifdown */
WDOG_ID txpoll; /* TX poll timer */
WDOG_ID txtimeout; /* TX timeout timer */
/* This holds the information visible to uIP/NuttX */
struct uip_driver_s dev; /* Interface understood by uIP */
/* Used to track transmit and receive descriptors */
uint8_t phyaddr; /* PHY address (pre-defined by pins on reset) */
uint16_t txhead; /* Circular buffer head index */
uint16_t txtail; /* Circualr buffer tail index */
uint16_t rxndx; /* RX index for current processing RX descriptor */
uint8_t *rxbuffer; /* Allocated RX buffers */
uint8_t *txbuffer; /* Allocated TX buffers */
struct emac_rxdesc_s *rxdesc; /* Allocated RX descriptors */
struct emac_txdesc_s *txdesc; /* Allocated TX descriptors */
/* Debug stuff */
#ifdef CONFIG_SAM34_EMAC_REGDEBUG
bool wrlast; /* Last was a write */
uintptr_t addrlast; /* Last address */
uint32_t vallast; /* Last value */
int ntimes; /* Number of times */
#endif
};
/****************************************************************************
* Private Data
****************************************************************************/
/* The driver state singleton */
static struct sam_emac_s g_emac;
#ifdef CONFIG_SAM34_EMAC_PREALLOCATE
/* Preallocated data */
/* TX descriptors list */
static struct emac_txdesc_s g_txdesc[CONFIG_SAM34_EMAC_NTXBUFFERS]
__attribute__((aligned(8)));
/* RX descriptors list */
static struct emac_rxdesc_s g_rxdesc[CONFIG_SAM34_EMAC_NRXBUFFERS]
__attribute__((aligned(8)));
/* Transmit Buffers
*
* Section 3.6 of AMBA 2.0 spec states that burst should not cross 1K Boundaries.
* Receive buffer manager writes are burst of 2 words => 3 lsb bits of the address
* shall be set to 0
*/
static uint8_t g_txbuffer[CONFIG_SAM34_EMAC_NTXBUFFERS * EMAC_TX_UNITSIZE];
__attribute__((aligned(8)))
/* Receive Buffers */
static uint8_t g_rxbuffer[CONFIG_SAM34_EMAC_NRXBUFFERS * EMAC_RX_UNITSIZE]
__attribute__((aligned(8)));
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Register operations ******************************************************/
#if defined(CONFIG_SAM34_EMAC_REGDEBUG) && defined(CONFIG_DEBUG)
static bool sam_checkreg(struct sam_emac_s *priv, bool wr,
uint32_t regval, uintptr_t address);
static uint32_t sam_getreg(struct sam_emac_s *priv, uintptr_t addr);
static void sam_putreg(struct sam_emac_s *priv, uintptr_t addr, uint32_t val);
#else
# define sam_getreg(priv,addr) getreg32(addr)
# define sam_putreg(priv,addr,val) putreg32(val,addr)
#endif
/* Buffer management */
static uint16_t sam_txinuse(struct sam_emac_s *priv);
static uint16_t sam_txfree(struct sam_emac_s *priv);
static int sam_buffer_initialize(struct sam_emac_s *priv);
static void sam_buffer_free(struct sam_emac_s *priv);
/* Common TX logic */
static int sam_transmit(struct sam_emac_s *priv);
static int sam_uiptxpoll(struct uip_driver_s *dev);
static void sam_dopoll(struct sam_emac_s *priv);
/* Interrupt handling */
static int sam_recvframe(struct sam_emac_s *priv);
static void sam_receive(struct sam_emac_s *priv);
static void sam_txdone(struct sam_emac_s *priv);
static int sam_emac_interrupt(int irq, void *context);
/* Watchdog timer expirations */
static void sam_polltimer(int argc, uint32_t arg, ...);
static void sam_txtimeout(int argc, uint32_t arg, ...);
/* NuttX callback functions */
static int sam_ifup(struct uip_driver_s *dev);
static int sam_ifdown(struct uip_driver_s *dev);
static int sam_txavail(struct uip_driver_s *dev);
#ifdef CONFIG_NET_IGMP
static int sam_addmac(struct uip_driver_s *dev, const uint8_t *mac);
static int sam_rmmac(struct uip_driver_s *dev, const uint8_t *mac);
#endif
/* PHY Initialization */
#if defined(CONFIG_DEBUG_NET) && defined(CONFIG_DEBUG_VERBOSE)
static void sam_phydump(struct sam_emac_s *priv);
#else
# define sam_phydump(priv)
#endif
static int sam_phywait(struct sam_emac_s *priv);
static int sam_phyreset(struct sam_emac_s *priv);
static int sam_phyfind(struct sam_emac_s *priv, uint8_t *phyaddr);
static int sam_phyread(struct sam_emac_s *priv, uint8_t phyaddr,
uint8_t regaddr, uint16_t *phyval);
static int sam_phywrite(struct sam_emac_s *priv, uint8_t phyaddr,
uint8_t regaddr, uint16_t phyval);
static int sam_autonegotiate(struct sam_emac_s *priv);
static bool sam_linkup(struct sam_emac_s *priv);
static int sam_phyinit(struct sam_emac_s *priv);
/* EMAC Initialization */
static void sam_txreset(struct sam_emac_s *priv);
static void sam_rxreset(struct sam_emac_s *priv);
static void sam_emac_reset(struct sam_emac_s *priv);
static void sam_macaddress(struct sam_emac_s *priv);
static int sam_emac_configure(struct sam_emac_s *priv);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: sam_checkreg
*
* Description:
* Check if the current register access is a duplicate of the preceding.
*
* Input Parameters:
* regval - The value to be written
* address - The address of the register to write to
*
* Returned Value:
* true: This is the first register access of this type.
* flase: This is the same as the preceding register access.
*
****************************************************************************/
#ifdef CONFIG_SAM34_EMAC_REGDEBUG
static bool sam_checkreg(struct sam_emac_s *priv, bool wr, uint32_t regval,
uintptr_t address)
{
if (wr == priv->wrlast && /* Same kind of access? */
regval == priv->vallast && /* Same value? */
address == priv->addrlast) /* Same address? */
{
/* Yes, then just keep a count of the number of times we did this. */
priv->ntimes++;
return false;
}
else
{
/* Did we do the previous operation more than once? */
if (priv->ntimes > 0)
{
/* Yes... show how many times we did it */
lldbg("...[Repeats %d times]...\n", priv->ntimes);
}
/* Save information about the new access */
priv->wrlast = wr;
priv->vallast = regval;
priv->addrlast = address;
priv->ntimes = 0;
}
/* Return true if this is the first time that we have done this operation */
return true;
}
#endif
/****************************************************************************
* Name: sam_getreg
*
* Description:
* Read any 32-bit register using an absolute
*
****************************************************************************/
#ifdef CONFIG_SAM34_EMAC_REGDEBUG
static uint32_t sam_getreg(struct sam_emac_s *priv, uintptr_t address)
{
uint32_t regval = getreg32(address);
if (sam_checkreg(priv, false, regval, address))
{
lldbg("%08x->%08x\n", address, regval);
}
return regval;
}
#endif
/****************************************************************************
* Name: sam_putreg
*
* Description:
* Write to any 32-bit register using an absolute address
*
****************************************************************************/
#ifdef CONFIG_SAM34_EMAC_REGDEBUG
static void sam_putreg(struct sam_emac_s *priv, uintptr_t address,
uint32_t regval)
{
if (sam_checkreg(priv, true, regval, address))
{
lldbg("%08x<-%08x\n", address, regval);
}
putreg32(regval, address);
}
#endif
/****************************************************************************
* Function: sam_txinuse
*
* Description:
* Return the number of TX buffers in-use
*
* Input Parameters:
* priv - The EMAC driver state
*
* Returned Value:
* The number of TX buffers in-use
*
****************************************************************************/
static uint16_t sam_txinuse(struct sam_emac_s *priv)
{
uint32_t txhead32 = (uint32_t)priv->txhead;
if ((uint32_t)priv->txtail > txhead32)
{
return txhead32 += CONFIG_SAM34_EMAC_NTXBUFFERS;
}
return (uint16_t)(txhead32 - (uint32_t)priv->txtail);
}
/****************************************************************************
* Function: sam_txfree
*
* Description:
* Return the number of TX buffers available
*
* Input Parameters:
* priv - The EMAC driver state
*
* Returned Value:
* The number of TX buffers available
*
****************************************************************************/
static uint16_t sam_txfree(struct sam_emac_s *priv)
{
/* The number available is equal to the total number of buffers, minus the
* number of buffers in use. Notice that that actual number of buffers is
* the configured size minus 1.
*/
return (CONFIG_SAM34_EMAC_NTXBUFFERS-1) - sam_txinuse(priv);
}
/****************************************************************************
* Function: sam_buffer_initialize
*
* Description:
* Allocate aligned TX and RX descriptors and buffers. For the case of
* pre-allocated structures, the function degenerates to a few assignements.
*
* Input Parameters:
* priv - The EMAC driver state
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
* Called very early in the initialization sequence.
*
****************************************************************************/
static int sam_buffer_initialize(struct sam_emac_s *priv)
{
#ifdef CONFIG_SAM34_EMAC_PREALLOCATE
/* Use pre-allocated buffers */
priv->txdesc = g_txdesc;
priv->rxdesc = g_rxdesc;
priv->txbuffer = g_txbuffer;
priv->rxbuffer = g_rxbuffer;
#else
size_t allocsize;
/* Allocate buffers */
allocsize = CONFIG_SAM34_EMAC_NTXBUFFERS * sizeof(struct emac_txdesc_s);
priv->txdesc = (struct emac_txdesc_s *)kmemalign(8, allocsize);
if (!priv->txdesc)
{
nlldbg("ERROR: Failed to allocate TX descriptors\n");
return -ENOMEM;
}
memset(priv->txdesc, 0, allocsize);
allocsize = CONFIG_SAM34_EMAC_NRXBUFFERS * sizeof(struct emac_rxdesc_s);
priv->rxdesc = (struct emac_rxdesc_s *)kmemalign(8, allocsize);
if (!priv->rxdesc)
{
nlldbg("ERROR: Failed to allocate RX descriptors\n");
sam_buffer_free(priv);
return -ENOMEM;
}
memset(priv->rxdesc, 0, allocsize);
allocsize = CONFIG_SAM34_EMAC_NTXBUFFERS * EMAC_TX_UNITSIZE;
priv->txbuffer = (uint8_t *)kmemalign(8, allocsize);
if (!priv->txbuffer)
{
nlldbg("ERROR: Failed to allocate TX buffer\n");
sam_buffer_free(priv);
return -ENOMEM;
}
allocsize = CONFIG_SAM34_EMAC_NRXBUFFERS * EMAC_RX_UNITSIZE;
priv->rxbuffer = (uint8_t *)kmemalign(8, allocsize);
if (!priv->rxbuffer)
{
nlldbg("ERROR: Failed to allocate RX buffer\n");
sam_buffer_free(priv);
return -ENOMEM;
}
#endif
DEBUGASSERT(((uintptr_t)priv->rxdesc & 7) == 0 &&
((uintptr_t)priv->rxbuffer & 7) == 0 &&
((uintptr_t)priv->txdesc & 7) == 0 &&
((uintptr_t)priv->txbuffer & 7) == 0);
return OK;
}
/****************************************************************************
* Function: sam_buffer_free
*
* Description:
* Free aligned TX and RX descriptors and buffers. For the case of
* pre-allocated structures, the function does nothing.
*
* Input Parameters:
* priv - The EMAC driver state
*
* Returned Value:
* None
*
****************************************************************************/
static void sam_buffer_free(struct sam_emac_s *priv)
{
#ifndef CONFIG_SAM34_EMAC_PREALLOCATE
/* Free allocated buffers */
if (priv->txdesc)
{
kfree(priv->txdesc);
priv->txdesc = NULL;
}
if (priv->rxdesc)
{
kfree(priv->rxdesc);
priv->rxdesc = NULL;
}
if (priv->txbuffer)
{
kfree(priv->txbuffer);
priv->txbuffer = NULL;
}
if (priv->rxbuffer)
{
kfree(priv->rxbuffer);
priv->rxbuffer = NULL;
}
#endif
}
/****************************************************************************
* Function: sam_transmit
*
* Description:
* Start hardware transmission. Called either from the txdone interrupt
* handling or from watchdog based polling.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK on success; a negated errno on failure
*
* Assumptions:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
static int sam_transmit(struct sam_emac_s *priv)
{
struct uip_driver_s *dev = &priv->dev;
volatile struct emac_txdesc_s *txdesc;
uint32_t regval;
uint32_t status;
nllvdbg("d_len: %d txhead: %d\n", dev->d_len, priv->txhead);
sam_dumppacket("Transmit packet", dev->d_buf, dev->d_len);
/* Check parameter */
if (dev->d_len > EMAC_TX_UNITSIZE)
{
nlldbg("ERROR: Packet too big: %d\n", dev->d_len);
return -EINVAL;
}
/* Pointer to the current TX descriptor */
txdesc = &priv->txdesc[priv->txhead];
/* If no free TX descriptor, buffer can't be sent */
if (sam_txfree(priv) < 1)
{
nlldbg("ERROR: No free TX descriptors\n");
return -EBUSY;
}
/* Setup/Copy data to transmission buffer */
if (dev->d_len > 0)
{
/* Driver managed the ring buffer */
memcpy((void *)txdesc->addr, dev->d_buf, dev->d_len);
}
/* Update TX descriptor status. */
status = dev->d_len | EMACTXD_STA_LAST;
if (priv->txhead == CONFIG_SAM34_EMAC_NTXBUFFERS-1)
{
status |= EMACTXD_STA_WRAP;
}
/* Update the descriptor status */
txdesc->status = status;
/* Increment the head index */
if (++priv->txhead >= CONFIG_SAM34_EMAC_NTXBUFFERS)
{
priv->txhead = 0;
}
/* Now start transmission (if it is not already done) */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_TSTART;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Setup the TX timeout watchdog (perhaps restarting the timer) */
(void)wd_start(priv->txtimeout, SAM_TXTIMEOUT, sam_txtimeout, 1,
(uint32_t)priv);
/* Set d_len to zero meaning that the d_buf[] packet buffer is again
* available.
*/
dev->d_len = 0;
/* If we have no more available TX descriptors, then we must disable the
* RCOMP interrupt to stop further RX processing. Why? Because EACH RX
* packet that is dispatch is also an opportunity to replay with the a TX
* packet. So, if we cannot handle an RX packet replay, then we disable
* all RX packet processing.
*/
if (sam_txfree(priv) < 1)
{
nllvdbg("Disabling RX interrupts\n");
sam_putreg(priv, SAM_EMAC_IDR, EMAC_INT_RCOMP);
}
return OK;
}
/****************************************************************************
* Function: sam_uiptxpoll
*
* Description:
* The transmitter is available, check if uIP has any outgoing packets ready
* to send. This is a callback from uip_poll(). uip_poll() may be called:
*
* 1. When the preceding TX packet send is complete,
* 2. When the preceding TX packet send timesout and the interface is reset
* 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:
* May or may not be called from an interrupt handler. In either case,
* global interrupts are disabled, either explicitly or indirectly through
* interrupt handling logic.
*
****************************************************************************/
static int sam_uiptxpoll(struct uip_driver_s *dev)
{
struct sam_emac_s *priv = (struct sam_emac_s *)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 (priv->dev.d_len > 0)
{
/* Send the packet */
uip_arp_out(&priv->dev);
sam_transmit(priv);
/* Check if the there are any free TX descriptors. We cannot perform
* the TX poll if we do not have buffering for another packet.
*/
if (sam_txfree(priv) == 0)
{
/* We have to terminate the poll if we have no more descriptors
* available for another transfer.
*/
return -EBUSY;
}
}
/* If zero is returned, the polling will continue until all connections have
* been examined.
*/
return 0;
}
/****************************************************************************
* Function: sam_dopoll
*
* Description:
* Perform the uIP poll.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by interrupt handling logic.
*
****************************************************************************/
static void sam_dopoll(struct sam_emac_s *priv)
{
struct uip_driver_s *dev = &priv->dev;
/* Check if the there are any free TX descriptors. We cannot perform the
* TX poll if we do not have buffering for another packet.
*/
if (sam_txfree(priv) > 0)
{
/* If we have the descriptor, then poll uIP for new XMIT data. */
(void)uip_poll(dev, sam_uiptxpoll);
}
}
/****************************************************************************
* Function: sam_recvframe
*
* Description:
* The function is called when a frame is received. It scans the RX
* descriptors of the received frame and assembles the full packet/
*
* NOTE: This function will silently discard any packets containing errors.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* OK if a packet was successfully returned; -EAGAIN if there are no
* further packets available
*
* Assumptions:
* - Global interrupts are disabled by interrupt handling logic.
* - The RX descriptor D-cache list has been invalided to force fetching
* from RAM.
*
****************************************************************************/
static int sam_recvframe(struct sam_emac_s *priv)
{
struct emac_rxdesc_s *rxdesc;
struct uip_driver_s *dev;
const uint8_t *src;
uint8_t *dest;
uint32_t rxndx;
uint32_t pktlen;
uint16_t copylen;
bool isframe;
/* Process received RX descriptor. The ownership bit is set by the EMAC
* once it has successfully written a frame to memory.
*/
dev = &priv->dev;
dev->d_len = 0;
rxndx = priv->rxndx;
rxdesc = &priv->rxdesc[rxndx];
isframe = false;
/* Invalidate the RX descriptor to force re-fetching from RAM */
sam_cmcc_invalidate((uintptr_t)rxdesc,
(uintptr_t)rxdesc + sizeof(struct emac_rxdesc_s));
nllvdbg("rxndx: %d\n", rxndx);
while ((rxdesc->addr & EMACRXD_ADDR_OWNER) != 0)
{
/* The start of frame bit indicates the beginning of a frame. Discard
* any previous fragments.
*/
if ((rxdesc->status & EMACRXD_STA_SOF) != 0)
{
/* Skip previous fragments */
while (rxndx != priv->rxndx)
{
/* Give ownership back to the EMAC */
rxdesc = &priv->rxdesc[priv->rxndx];
rxdesc->addr &= ~(EMACRXD_ADDR_OWNER);
/* Increment the RX index */
if (++priv->rxndx >= CONFIG_SAM34_EMAC_NRXBUFFERS)
{
priv->rxndx = 0;
}
}
/* Reset the packet data pointer and packet length */
dest = dev->d_buf;
pktlen = 0;
/* Start to gather buffers into the packet buffer */
isframe = true;
}
/* Increment the working index */
if (++rxndx >= CONFIG_SAM34_EMAC_NRXBUFFERS)
{
rxndx = 0;
}
/* Copy data into the packet buffer */
if (isframe)
{
if (rxndx == priv->rxndx)
{
nllvdbg("ERROR: No EOF (Invalid of buffers too small)\n");
do
{
/* Give ownership back to the EMAC */
rxdesc = &priv->rxdesc[priv->rxndx];
rxdesc->addr &= ~(EMACRXD_ADDR_OWNER);
/* Increment the RX index */
if (++priv->rxndx >= CONFIG_SAM34_EMAC_NRXBUFFERS)
{
priv->rxndx = 0;
}
}
while (rxndx != priv->rxndx);
return -EIO;
}
/* Get the number of bytes to copy from the buffer */
copylen = EMAC_RX_UNITSIZE;
if ((pktlen + copylen) > CONFIG_NET_BUFSIZE)
{
copylen = CONFIG_NET_BUFSIZE - pktlen;
}
/* Get the data source. Invalidate the source memory region to
* force reload from RAM.
*/
src = (const uint8_t *)(rxdesc->addr & EMACRXD_ADDR_MASK);
sam_cmcc_invalidate((uintptr_t)src, (uintptr_t)src + copylen);
/* And do the copy */
memcpy(dest, src, copylen);
dest += copylen;
pktlen += copylen;
/* If the end of frame has been received, return the data */
if ((rxdesc->status & EMACRXD_STA_EOF) != 0)
{
/* Frame size from the EMAC */
dev->d_len = (rxdesc->status & EMACRXD_STA_FRLEN_MASK);
nllvdbg("packet %d-%d (%d)\n", priv->rxndx, rxndx, dev->d_len);
/* All data have been copied in the application frame buffer,
* release the RX descriptor
*/
while (priv->rxndx != rxndx)
{
/* Give ownership back to the EMAC */
rxdesc = &priv->rxdesc[priv->rxndx];
rxdesc->addr &= ~(EMACRXD_ADDR_OWNER);
/* Increment the RX index */
if (++priv->rxndx >= CONFIG_SAM34_EMAC_NRXBUFFERS)
{
priv->rxndx = 0;
}
}
/* Check if the device packet buffer was large enough to accept
* all of the data.
*/
nllvdbg("rxndx: %d d_len: %d\n", priv->rxndx, dev->d_len);
if (pktlen < dev->d_len)
{
nlldbg("ERROR: Buffer size %d; frame size %d\n", dev->d_len, pktlen);
return -E2BIG;
}
return OK;
}
}
/* We have not encount the SOF yet... discard this fragment and keep looking */
else
{
/* Give ownership back to the EMAC */
rxdesc->addr &= ~(EMACRXD_ADDR_OWNER);
priv->rxndx = rxndx;
}
/* Process the next buffer */
rxdesc = &priv->rxdesc[rxndx];
/* Invalidate the RX descriptor to force re-fetching from RAM */
sam_cmcc_invalidate((uintptr_t)rxdesc,
(uintptr_t)rxdesc + sizeof(struct emac_rxdesc_s));
}
/* No packet was found */
priv->rxndx = rxndx;
nllvdbg("rxndx: %d\n", priv->rxndx);
return -EAGAIN;
}
/****************************************************************************
* Function: sam_receive
*
* Description:
* An interrupt was received indicating the availability of a new RX packet
* in FIFO memory.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by interrupt handling logic.
*
****************************************************************************/
static void sam_receive(struct sam_emac_s *priv)
{
struct uip_driver_s *dev = &priv->dev;
/* Loop while while sam_recvframe() successfully retrieves valid
* EMAC frames.
*/
while (sam_recvframe(priv) == OK)
{
sam_dumppacket("Received packet", dev->d_buf, dev->d_len);
/* Check if the packet is a valid size for the uIP buffer configuration
* (this should not happen)
*/
if (dev->d_len > CONFIG_NET_BUFSIZE)
{
nlldbg("DROPPED: Too big: %d\n", dev->d_len);
}
/* We only accept IP packets of the configured type and ARP packets */
#ifdef CONFIG_NET_IPv6
else if (BUF->type == HTONS(UIP_ETHTYPE_IP6))
#else
else if (BUF->type == HTONS(UIP_ETHTYPE_IP))
#endif
{
nllvdbg("IP frame\n");
/* Handle ARP on input then give the IP packet to uIP */
uip_arp_ipin(&priv->dev);
uip_input(&priv->dev);
/* If the above function invocation resulted in data that should be
* sent out on the network, the field d_len will set to a value > 0.
*/
if (priv->dev.d_len > 0)
{
uip_arp_out(&priv->dev);
sam_transmit(priv);
}
}
else if (BUF->type == htons(UIP_ETHTYPE_ARP))
{
nllvdbg("ARP frame\n");
/* Handle ARP packet */
uip_arp_arpin(&priv->dev);
/* If the above function invocation resulted in data that should be
* sent out on the network, the field d_len will set to a value > 0.
*/
if (priv->dev.d_len > 0)
{
sam_transmit(priv);
}
}
else
{
nlldbg("DROPPED: Unknown type: %04x\n", BUF->type);
}
}
}
/****************************************************************************
* Function: sam_txdone
*
* Description:
* An interrupt was received indicating that a frame has completed
* transmission.
*
* Parameters:
* priv - Reference to the driver state structure
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void sam_txdone(struct sam_emac_s *priv)
{
struct emac_txdesc_s *txdesc;
/* Are there any outstanding transmssions? Loop until either (1) all of
* the TX have been examined, or (2) until we encounter the first
* descriptor that is still in use by the hardware.
*/
while (priv->txhead != priv->txtail)
{
/* Yes.. check the next buffer at the tail of the list */
txdesc = &priv->txdesc[priv->txtail];
sam_cmcc_invalidate((uintptr_t)txdesc,
(uintptr_t)txdesc + sizeof(struct emac_txdesc_s));
/* Is this TX descriptor still in use? */
if ((txdesc->status & EMACTXD_STA_USED) == 0)
{
/* Yes.. the descriptor is still in use. However, I have seen a
* case (only repeatable on start-up) where the USED bit is never
* set. Yikes! If we have encountered the first still busy
* descriptor, then we should also have TQBD equal to the descriptor
* address. If it is not, then treat is as used anyway.
*/
#if 0 /* The issue does not exist in the current configuration, but may return */
#warning REVISIT
if (priv->txtail == 0 &&
sam_physramaddr((uintptr_t)txdesc) != sam_getreg(priv, SAM_EMAC_TBQB))
{
txdesc->status = (uint32_t)EMACTXD_STA_USED;
}
else
#endif
{
/* Otherwise, the descriptor is truly in use. Break out of the
* loop now.
*/
break;
}
}
/* Increment the tail index */
if (++priv->txtail >= CONFIG_SAM34_EMAC_NTXBUFFERS)
{
/* Wrap to the beginning of the TX descriptor list */
priv->txtail = 0;
}
/* At least one TX descriptor is available. Re-enable RX interrupts.
* RX interrupts may previously have been disabled when we ran out of
* TX desciptors (see commits in sam_transmit()).
*/
sam_putreg(priv, SAM_EMAC_IER, EMAC_INT_RCOMP);
}
/* Then poll uIP for new XMIT data */
sam_dopoll(priv);
}
/****************************************************************************
* Function: sam_emac_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:
*
****************************************************************************/
static int sam_emac_interrupt(int irq, void *context)
{
struct sam_emac_s *priv = &g_emac;
uint32_t isr;
uint32_t rsr;
uint32_t tsr;
uint32_t imr;
uint32_t regval;
uint32_t pending;
uint32_t clrbits;
isr = sam_getreg(priv, SAM_EMAC_ISR);
rsr = sam_getreg(priv, SAM_EMAC_RSR);
tsr = sam_getreg(priv, SAM_EMAC_TSR);
imr = sam_getreg(priv, SAM_EMAC_IMR);
pending = isr & ~(imr | EMAC_INT_UNUSED);
nllvdbg("isr: %08x pending: %08x\n", isr, pending);
/* Check for the completion of a transmission. This should be done before
* checking for received data (because receiving can cause another transmission
* before we had a chance to handle the last one).
*
* ISR:TCOMP is set when a frame has been transmitted. Cleared on read.
* TSR:TXCOMP is set when a frame has been transmitted. Cleared by writing a
* one to this bit.
*/
if ((pending & EMAC_INT_TCOMP) != 0 || (tsr & EMAC_TSR_TXCOMP) != 0)
{
/* A frame has been transmitted */
clrbits = EMAC_TSR_TXCOMP;
/* Check for Retry Limit Exceeded (RLE) */
if ((tsr & EMAC_TSR_RLE) != 0)
{
/* Status RLE & Number of discarded buffers */
clrbits = EMAC_TSR_RLE | sam_txinuse(priv);
sam_txreset(priv);
nlldbg("ERROR: Retry Limit Exceeded TSR: %08x\n", tsr);
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_TXEN;
sam_putreg(priv, SAM_EMAC_NCR, regval);
}
/* Check Collision Occurred (COL) */
if ((tsr & EMAC_TSR_COL) != 0)
{
nlldbg("ERROR: Collision occurred TSR: %08x\n", tsr);
clrbits |= EMAC_TSR_COL;
}
/* Check Transmit Frame Corruption due to AHB error (TFC) */
if ((tsr & EMAC_TSR_TFC) != 0)
{
nlldbg("ERROR: Transmit Frame Corruption due to AHB error: %08x\n", tsr);
clrbits |= EMAC_TSR_TFC;
}
/* Check for Transmit Underrun (UND)
*
* ISR:UND is set transmit DMA was not able to read data from memory,
* either because the bus was not granted in time, because a not
* OK hresp(bus error) was returned or because a used bit was read
* midway through frame transmission. If this occurs, the
* transmitter forces bad CRC. Cleared by writing a one to this bit.
*/
if ((tsr & EMAC_TSR_UND) != 0)
{
nlldbg("ERROR: Transmit Underrun TSR: %08x\n", tsr);
clrbits |= EMAC_TSR_UND;
}
/* Clear status */
sam_putreg(priv, SAM_EMAC_TSR, clrbits);
/* And handle the TX done event */
sam_txdone(priv);
}
/* Check for the receipt of an RX packet.
*
* RXCOMP indicates that a packet has been received and stored in memory.
* The RXCOMP bit is cleared whent he interrupt status register was read.
* RSR:REC indicates that one or more frames have been received and placed
* in memory. This indication is cleared by writing a one to this bit.
*/
if ((pending & EMAC_INT_RCOMP) != 0 || (rsr & EMAC_RSR_REC) != 0)
{
clrbits = EMAC_RSR_REC;
/* Check for Receive Overrun.
*
* RSR:RXOVR will be set if the RX FIFO is not able to store the
* receive frame due to a FIFO overflow, or if the receive status
* was not taken at the end of the frame. This bit is also set in
* DMA packet buffer mode if the packet buffer overflows. For DMA
* operation, the buffer will be recovered if an overrun occurs. This
* bit is cleared when set to 1.
*/
if ((rsr & EMAC_RSR_RXOVR) != 0)
{
nlldbg("ERROR: Receiver overrun RSR: %08x\n", rsr);
clrbits |= EMAC_RSR_RXOVR;
}
/* Check for buffer not available (BNA)
*
* RSR:BNA means that an attempt was made to get a new buffer and the
* pointer indicated that it was owned by the processor. The DMA will
* reread the pointer each time an end of frame is received until a
* valid pointer is found. This bit is set following each descriptor
* read attempt that fails, even if consecutive pointers are
* unsuccessful and software has in the mean time cleared the status
* flag. Cleared by writing a one to this bit.
*/
if ((rsr & EMAC_RSR_BNA) != 0)
{
nlldbg("ERROR: Buffer not available RSR: %08x\n", rsr);
clrbits |= EMAC_RSR_BNA;
}
/* Clear status */
sam_putreg(priv, SAM_EMAC_RSR, clrbits);
/* Handle the received packet */
sam_receive(priv);
}
#ifdef CONFIG_DEBUG_NET
/* Check for PAUSE Frame recieved (PFRE).
*
* ISR:PFRE indicates that a pause frame has been received with non-zero
* pause quantum. Cleared on a read.
*/
if ((pending & EMAC_INT_PFNX) != 0)
{
nlldbg("Pause frame received\n");
}
/* Check for Pause Time Zero (PTZ)
*
* ISR:PTZ is set Pause Time Zero
*/
if ((pending & EMAC_INT_PTZ) != 0)
{
nlldbg("Pause TO!\n");
}
#endif
return OK;
}
/****************************************************************************
* Function: sam_txtimeout
*
* Description:
* Our TX watchdog timed out. Called from the timer interrupt handler.
* The last TX never completed. Reset the hardware and start again.
*
* Parameters:
* argc - The number of available arguments
* arg - The first argument
*
* Returned Value:
* None
*
* Assumptions:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void sam_txtimeout(int argc, uint32_t arg, ...)
{
struct sam_emac_s *priv = (struct sam_emac_s *)arg;
nlldbg("Timeout!\n");
/* Then reset the hardware. Just take the interface down, then back
* up again.
*/
sam_ifdown(&priv->dev);
sam_ifup(&priv->dev);
/* Then poll uIP for new XMIT data */
sam_dopoll(priv);
}
/****************************************************************************
* Function: sam_polltimer
*
* 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:
* Global interrupts are disabled by the watchdog logic.
*
****************************************************************************/
static void sam_polltimer(int argc, uint32_t arg, ...)
{
struct sam_emac_s *priv = (struct sam_emac_s *)arg;
struct uip_driver_s *dev = &priv->dev;
/* Check if the there are any free TX descriptors. We cannot perform the
* TX poll if we do not have buffering for another packet.
*/
if (sam_txfree(priv) > 0)
{
/* Update TCP timing states and poll uIP for new XMIT data. */
(void)uip_timer(dev, sam_uiptxpoll, SAM_POLLHSEC);
}
/* Setup the watchdog poll timer again */
(void)wd_start(priv->txpoll, SAM_WDDELAY, sam_polltimer, 1, arg);
}
/****************************************************************************
* Function: sam_ifup
*
* Description:
* NuttX Callback: Bring up the EMAC interface when an IP address is
* provided
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int sam_ifup(struct uip_driver_s *dev)
{
struct sam_emac_s *priv = (struct sam_emac_s *)dev->d_private;
int ret;
nlldbg("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);
/* Configure the EMAC interface for normal operation. */
nllvdbg("Initialize the EMAC\n");
sam_emac_configure(priv);
/* Set the MAC address (should have been configured while we were down) */
sam_macaddress(priv);
/* Initialize for PHY access */
ret = sam_phyinit(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_phyinit failed: %d\n", ret);
return ret;
}
/* Auto Negotiate, working in RMII mode */
ret = sam_autonegotiate(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_autonegotiate failed: %d\n", ret);
return ret;
}
while (sam_linkup(priv) == 0);
nllvdbg("Link detected \n");
/* Enable normal MAC operation */
nllvdbg("Enable normal operation\n");
/* Set and activate a timer process */
(void)wd_start(priv->txpoll, SAM_WDDELAY, sam_polltimer, 1, (uint32_t)priv);
/* Enable the EMAC interrupt */
priv->ifup = true;
up_enable_irq(SAM_IRQ_EMAC);
return OK;
}
/****************************************************************************
* Function: sam_ifdown
*
* Description:
* NuttX Callback: Stop the interface.
*
* Parameters:
* dev - Reference to the NuttX driver state structure
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static int sam_ifdown(struct uip_driver_s *dev)
{
struct sam_emac_s *priv = (struct sam_emac_s *)dev->d_private;
irqstate_t flags;
nlldbg("Taking the network down\n");
/* Disable the EMAC interrupt */
flags = irqsave();
up_disable_irq(SAM_IRQ_EMAC);
/* Cancel the TX poll timer and TX timeout timers */
wd_cancel(priv->txpoll);
wd_cancel(priv->txtimeout);
/* Put the EMAC in its reset, non-operational state. This should be
* a known configuration that will guarantee the sam_ifup() always
* successfully brings the interface back up.
*/
sam_emac_reset(priv);
/* Mark the device "down" */
priv->ifup = false;
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: sam_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:
* Called in normal user mode
*
****************************************************************************/
static int sam_txavail(struct uip_driver_s *dev)
{
struct sam_emac_s *priv = (struct sam_emac_s *)dev->d_private;
irqstate_t flags;
nllvdbg("ifup: %d\n", priv->ifup);
/* Disable interrupts because this function may be called from interrupt
* level processing.
*/
flags = irqsave();
/* Ignore the notification if the interface is not yet up */
if (priv->ifup)
{
/* Poll uIP for new XMIT data */
sam_dopoll(priv);
}
irqrestore(flags);
return OK;
}
/****************************************************************************
* Function: sam_addmac
*
* Description:
* NuttX Callback: Add the specified MAC address to the hardware multicast
* address filtering
*
* Parameters:
* dev - Reference to the NuttX driver state structure
* mac - The MAC address to be added
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int sam_addmac(struct uip_driver_s *dev, const uint8_t *mac)
{
struct sam_emac_s *priv = (struct sam_emac_s *)dev->d_private;
nllvdbg("MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
/* Add the MAC address to the hardware multicast routing table */
/* Add the MAC address to the hardware multicast routing table */
#error "Missing logic"
return OK;
}
#endif
/****************************************************************************
* Function: sam_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:
* None
*
* Assumptions:
*
****************************************************************************/
#ifdef CONFIG_NET_IGMP
static int sam_rmmac(struct uip_driver_s *dev, const uint8_t *mac)
{
struct sam_emac_s *priv = (struct sam_emac_s *)dev->d_private;
nllvdbg("MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
/* Add the MAC address to the hardware multicast routing table */
#error "Missing logic"
return OK;
}
#endif
/****************************************************************************
* Function: sam_phydump
*
* Description:
* Dump the contents of PHY registers
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* None
*
****************************************************************************/
#if defined(CONFIG_DEBUG_NET) && defined(CONFIG_DEBUG_VERBOSE)
static void sam_phydump(struct sam_emac_s *priv)
{
uint32_t regval;
uint16_t phyval;
/* Enable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
#ifdef CONFIG_SAM34_EMAC_RMII
nllvdbg("RMII Registers (Address %02x)\n", priv->phyaddr);
#else /* defined(CONFIG_SAM34_EMAC_MII) */
nllvdbg("MII Registers (Address %02x)\n", priv->phyaddr);
#endif
sam_phyread(priv, priv->phyaddr, MII_MCR, &phyval);
nllvdbg(" MCR: %04x\n", phyval);
sam_phyread(priv, priv->phyaddr, MII_MSR, &phyval);
nllvdbg(" MSR: %04x\n", phyval);
sam_phyread(priv, priv->phyaddr, MII_ADVERTISE, &phyval);
nllvdbg(" ADVERTISE: %04x\n", phyval);
sam_phyread(priv, priv->phyaddr, MII_LPA, &phyval);
nllvdbg(" LPR: %04x\n", phyval);
sam_phyread(priv, priv->phyaddr, CONFIG_SAM34_EMAC_PHYSR, &phyval);
nllvdbg(" PHYSR: %04x\n", phyval);
/* Disable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
}
#endif
/****************************************************************************
* Function: sam_phywait
*
* Description:
* Wait for the PHY to become IDLE
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno (-ETIMEDOUT) on failure.
*
****************************************************************************/
static int sam_phywait(struct sam_emac_s *priv)
{
volatile unsigned int retries;
/* Loop for the configured number of attempts */
for (retries = 0; retries < PHY_RETRY_MAX; retries++)
{
/* Is the PHY IDLE */
if ((sam_getreg(priv, SAM_EMAC_NSR) & EMAC_NSR_IDLE) != 0)
{
return OK;
}
}
return -ETIMEDOUT;
}
/****************************************************************************
* Function: sam_phyreset
*
* Description:
* Reset the PHY
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int sam_phyreset(struct sam_emac_s *priv)
{
uint32_t regval;
uint16_t mcr;
int timeout;
int ret;
nllvdbg(" sam_phyreset\n");
/* Enable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Reset the PHY */
ret = sam_phywrite(priv, priv->phyaddr, MII_MCR, MII_MCR_RESET);
if (ret < 0)
{
nlldbg("ERROR: sam_phywrite failed: %d\n", ret);
}
/* Wait for the PHY reset to complete */
ret = -ETIMEDOUT;
for (timeout = 0; timeout < 10; timeout++)
{
mcr = MII_MCR_RESET;
int result = sam_phyread(priv, priv->phyaddr, MII_MCR, &mcr);
if (result < 0)
{
nlldbg("ERROR: Failed to read the MCR register: %d\n", ret);
ret = result;
}
else if ((mcr & MII_MCR_RESET) == 0)
{
ret = OK;
break;
}
}
/* Disable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
return ret;
}
/****************************************************************************
* Function: sam_phyfind
*
* Description:
* Verify the PHY address and, if it is bad, try to one that works.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int sam_phyfind(struct sam_emac_s *priv, uint8_t *phyaddr)
{
uint32_t regval;
uint16_t phyval;
uint8_t candidate;
unsigned int offset;
int ret = -ESRCH;
nllvdbg("Find a valid PHY address\n");
/* Enable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
candidate = *phyaddr;
/* Check current candidate address */
ret = sam_phyread(priv, candidate, MII_PHYID1, &phyval);
if (ret == OK && phyval == MII_OUI_MSB)
{
*phyaddr = candidate;
ret = OK;
}
/* The current address does not work... try another */
else
{
nlldbg("ERROR: sam_phyread failed for PHY address %02x: %d\n",
candidate, ret);
for (offset = 0; offset < 32; offset++)
{
/* Get the next candidate PHY address */
candidate = (candidate + 1) & 0x1f;
/* Try reading the PHY ID from the candidate PHY address */
ret = sam_phyread(priv, candidate, MII_PHYID1, &phyval);
if (ret == OK && phyval == MII_OUI_MSB)
{
ret = OK;
break;
}
}
}
if (ret == OK)
{
nllvdbg(" PHYID1: %04x PHY addr: %d\n", phyval, candidate);
*phyaddr = candidate;
sam_phyread(priv, candidate, CONFIG_SAM34_EMAC_PHYSR, &phyval);
nllvdbg(" PHYSR: %04x PHY addr: %d\n", phyval, candidate);
}
/* Disable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
return ret;
}
/****************************************************************************
* Function: sam_phyread
*
* Description:
* Read a PHY register.
*
* Parameters:
* priv - A reference to the private driver state structure
* phyaddr - The PHY device address
* regaddr - The PHY register address
* phyval - The location to return the 16-bit PHY register value.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int sam_phyread(struct sam_emac_s *priv, uint8_t phyaddr,
uint8_t regaddr, uint16_t *phyval)
{
uint32_t regval;
int ret;
/* Make sure that the PHY is idle */
ret = sam_phywait(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_phywait failed: %d\n", ret);
return ret;
}
/* Write the PHY Maintenance register */
regval = EMAC_MAN_DATA(0) | EMAC_MAN_WTN | EMAC_MAN_REGA(regaddr) |
EMAC_MAN_PHYA(phyaddr) | EMAC_MAN_READ | EMAC_MAN_WZO;
#ifndef CONFIG_SAM34_EMAC_CLAUSE45
/* CLTTO must be set for Clause 22 operation. To read clause 45 PHYs, bit
* 30 should be written with a 0 rather than a 1.
*/
regval |= EMAC_MAN_CLTTO;
#endif
sam_putreg(priv, SAM_EMAC_MAN, regval);
/* Wait until the PHY is again idle */
ret = sam_phywait(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_phywait failed: %d\n", ret);
return ret;
}
/* Return data */
*phyval = (uint16_t)(sam_getreg(priv, SAM_EMAC_MAN) & EMAC_MAN_DATA_MASK);
return OK;
}
/****************************************************************************
* Function: sam_phywrite
*
* Description:
* Write to a PHY register.
*
* Parameters:
* priv - A reference to the private driver state structure
* phyaddr - The PHY device address
* regaddr - The PHY register address
* phyval - The 16-bit value to write to the PHY register.
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int sam_phywrite(struct sam_emac_s *priv, uint8_t phyaddr,
uint8_t regaddr, uint16_t phyval)
{
uint32_t regval;
int ret;
/* Make sure that the PHY is idle */
ret = sam_phywait(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_phywait failed: %d\n", ret);
return ret;
}
/* Write the PHY Maintenance register */
regval = EMAC_MAN_DATA(phyval) | EMAC_MAN_WTN | EMAC_MAN_REGA(regaddr) |
EMAC_MAN_PHYA(phyaddr) | EMAC_MAN_WRITE | EMAC_MAN_WZO;
#ifndef CONFIG_SAM34_EMAC_CLAUSE45
/* CLTTO must be set for Clause 22 operation. To read clause 45 PHYs, bit
* 30 should be written with a 0 rather than a 1.
*/
regval |= EMAC_MAN_CLTTO;
#endif
sam_putreg(priv, SAM_EMAC_MAN, regval);
/* Wait until the PHY is again IDLE */
ret = sam_phywait(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_phywait failed: %d\n", ret);
return ret;
}
return OK;
}
/****************************************************************************
* Function: sam_autonegotiate
*
* Description:
* Autonegotiate speed and duplex.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
static int sam_autonegotiate(struct sam_emac_s *priv)
{
uint32_t regval;
uint16_t phyid1;
uint16_t phyid2;
uint16_t mcr;
uint16_t msr;
uint16_t advertise;
uint16_t lpa;
int timeout;
int ret;
/* Enable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Verify tht we can read the PHYID register */
ret = sam_phyread(priv, priv->phyaddr, MII_PHYID1, &phyid1);
if (ret < 0)
{
nlldbg("ERROR: Failed to read PHYID1\n");
goto errout;
}
nllvdbg("PHYID1: %04x PHY address: %02x\n", phyid1, priv->phyaddr);
ret = sam_phyread(priv, priv->phyaddr, MII_PHYID2, &phyid2);
if (ret < 0)
{
nlldbg("ERROR: Failed to read PHYID2\n");
goto errout;
}
nllvdbg("PHYID2: %04x PHY address: %02x\n", phyid2, priv->phyaddr);
if (phyid1 == MII_OUI_MSB &&
((phyid2 & MII_PHYID2_OUI_MASK) >> MII_PHYID2_OUI_SHIFT) == MII_OUI_LSB)
{
nllvdbg(" Vendor Model Number: %04x\n",
(phyid2 & MII_PHYID2_MODEL_MASK) >> MII_PHYID2_MODEL_SHIFT);
nllvdbg(" Model Revision Number: %04x\n",
(phyid2 & MII_PHYID2_REV_MASK) >> MII_PHYID2_REV_SHIFT);
}
else
{
nlldbg("ERROR: PHY not recognized\n");
}
/* Setup control register */
ret = sam_phyread(priv, priv->phyaddr, MII_MCR, &mcr);
if (ret < 0)
{
nlldbg("ERROR: Failed to read MCR\n");
goto errout;
}
mcr &= ~MII_MCR_ANENABLE; /* Remove autonegotiation enable */
mcr &= ~(MII_MCR_LOOPBACK | MII_MCR_PDOWN);
mcr |= MII_MCR_ISOLATE; /* Electrically isolate PHY */
ret = sam_phywrite(priv, priv->phyaddr, MII_MCR, mcr);
if (ret < 0)
{
nlldbg("ERROR: Failed to write MCR\n");
goto errout;
}
/* Set the Auto_negotiation Advertisement Register MII advertising for
* Next page 100BaseTxFD and HD, 10BaseTFD and HD, IEEE 802.3
*/
advertise = MII_ADVERTISE_100BASETXFULL | MII_ADVERTISE_100BASETXHALF |
MII_ADVERTISE_10BASETXFULL | MII_ADVERTISE_10BASETXHALF |
MII_ADVERTISE_8023;
ret = sam_phywrite(priv, priv->phyaddr, MII_ADVERTISE, advertise);
if (ret < 0)
{
nlldbg("ERROR: Failed to write ANAR\n");
goto errout;
}
/* Read and modify control register */
ret = sam_phyread(priv, priv->phyaddr, MII_MCR, &mcr);
if (ret < 0)
{
nlldbg("ERROR: Failed to read MCR\n");
goto errout;
}
mcr |= (MII_MCR_SPEED100 | MII_MCR_ANENABLE | MII_MCR_FULLDPLX);
ret = sam_phywrite(priv, priv->phyaddr, MII_MCR, mcr);
if (ret < 0)
{
nlldbg("ERROR: Failed to write MCR\n");
goto errout;
}
/* Restart Auto_negotiation */
mcr |= MII_MCR_ANRESTART;
mcr &= ~MII_MCR_ISOLATE;
ret = sam_phywrite(priv, priv->phyaddr, MII_MCR, mcr);
if (ret < 0)
{
nlldbg("ERROR: Failed to write MCR\n");
goto errout;
}
nllvdbg(" MCR: %04x\n", mcr);
/* Check AutoNegotiate complete */
timeout = 0;
for (;;)
{
ret = sam_phyread(priv, priv->phyaddr, MII_MSR, &msr);
if (ret < 0)
{
nlldbg("ERROR: Failed to read MSR\n");
goto errout;
}
/* Completed successfully? */
if ((msr & MII_MSR_ANEGCOMPLETE) != 0)
{
/* Yes.. break out of the loop */
nllvdbg("AutoNegotiate complete\n");
break;
}
/* No.. check for a timeout */
if (++timeout >= PHY_RETRY_MAX)
{
nlldbg("ERROR: TimeOut\n");
sam_phydump(priv);
ret = -ETIMEDOUT;
goto errout;
}
}
/* Get the AutoNeg Link partner base page */
ret = sam_phyread(priv, priv->phyaddr, MII_LPA, &lpa);
if (ret < 0)
{
nlldbg("ERROR: Failed to read ANLPAR\n");
goto errout;
}
/* Setup the EMAC link speed */
regval = sam_getreg(priv, SAM_EMAC_NCFGR);
regval &= (EMAC_NCFGR_SPD | EMAC_NCFGR_FD);
if (((advertise & lpa) & MII_ADVERTISE_100BASETXFULL) != 0)
{
/* Set MII for 100BaseTX and Full Duplex */
regval |= (EMAC_NCFGR_SPD | EMAC_NCFGR_FD);
}
else if (((advertise & lpa) & MII_ADVERTISE_10BASETXFULL) != 0)
{
/* Set MII for 10BaseT and Full Duplex */
regval |= EMAC_NCFGR_FD;
}
else if (((advertise & lpa) & MII_ADVERTISE_100BASETXHALF) != 0)
{
/* Set MII for 100BaseTX and half Duplex */
regval |= EMAC_NCFGR_SPD;
}
#if 0
else if (((advertise & lpa) & MII_ADVERTISE_10BASETXHALF) != 0)
{
/* set MII for 10BaseT and half Duplex */
}
#endif
sam_putreg(priv, SAM_EMAC_NCFGR, regval);
/* Select RMII/MII */
regval = sam_getreg(priv, SAM_EMAC_UR);
#ifdef CONFIG_SAM34_EMAC_RMII
regval &= ~EMAC_UR_MII;
#else /* defined(CONFIG_SAM34_EMAC_MII) */
regval |= EMAC_UR_MII;
#endif
sam_putreg(priv, SAM_EMAC_UR, regval);
errout:
/* Disable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
return ret;
}
/****************************************************************************
* Function: sam_linkup
*
* Description:
* Check if the link is up
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* true: The link is up
*
****************************************************************************/
static bool sam_linkup(struct sam_emac_s *priv)
{
uint32_t regval;
uint16_t msr;
uint16_t physr;
bool linkup = false;
int ret;
/* Enable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
ret = sam_phyread(priv, priv->phyaddr, MII_MSR, &msr);
if (ret < 0)
{
nlldbg("ERROR: Failed to read MSR: %d\n", ret);
goto errout;
}
if ((msr & MII_MSR_LINKSTATUS) == 0)
{
nlldbg("ERROR: MSR LinkStatus: %04x\n", msr);
goto errout;
}
/* Re-configure Link speed */
ret = sam_phyread(priv, priv->phyaddr, CONFIG_SAM34_EMAC_PHYSR, &physr);
if (ret < 0)
{
nlldbg("ERROR: Failed to read PHYSR: %d\n", ret);
goto errout;
}
regval = sam_getreg(priv, SAM_EMAC_NCFGR);
regval &= ~(EMAC_NCFGR_SPD | EMAC_NCFGR_FD);
if ((msr & MII_MSR_100BASETXFULL) != 0 && PHYSR_IS100FDX(physr))
{
/* Set EMAC for 100BaseTX and Full Duplex */
regval |= (EMAC_NCFGR_SPD | EMAC_NCFGR_FD);
}
else if ((msr & MII_MSR_10BASETXFULL) != 0 && PHYSR_IS10FDX(physr))
{
/* Set MII for 10BaseT and Full Duplex */
regval |= EMAC_NCFGR_FD;
}
else if ((msr & MII_MSR_100BASETXHALF) != 0 && PHYSR_IS100HDX(physr))
{
/* Set MII for 100BaseTX and Half Duplex */
regval |= EMAC_NCFGR_SPD;
}
#if 0
else if ((msr & MII_MSR_10BASETXHALF) != 0 && PHYSR_IS10HDX(physr))
{
/* Set MII for 10BaseT and Half Duplex */
}
#endif
sam_putreg(priv, SAM_EMAC_NCFGR, regval);
/* Start the EMAC transfers */
nllvdbg("Link is up\n");
linkup = true;
errout:
/* Disable management port */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_MPE;
sam_putreg(priv, SAM_EMAC_NCR, regval);
return linkup;
}
/****************************************************************************
* Function: sam_phyinit
*
* Description:
* Configure the PHY and determine the link speed/duplex.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
static int sam_phyinit(struct sam_emac_s *priv)
{
uint32_t regval;
int ret;
/* Configure PHY clocking */
regval = sam_getreg(priv, SAM_EMAC_NCFGR);
regval &= ~EMAC_NCFGR_CLK_MASK;
#if BOARD_MCK_FREQUENCY > (160*1000*1000)
# error Supported MCK frequency
#elif BOARD_MCK_FREQUENCY > (80*1000*1000)
regval |= EMAC_NCFGR_CLK_DIV64; /* MCK divided by 64 (MCK up to 160 MHz) */
#elif BOARD_MCK_FREQUENCY > (40*1000*1000)
regval |= EMAC_NCFGR_CLK_DIV32; /* MCK divided by 32 (MCK up to 80 MHz) */
#elif BOARD_MCK_FREQUENCY > (20*1000*1000)
regval |= EMAC_NCFGR_CLK_DIV16; /* MCK divided by 16 (MCK up to 40 MHz) */
#else
regval |= EMAC_NCFGR_CLK_DIV8; /* MCK divided by 8 (MCK up to 20 MHz) */
#endif
sam_putreg(priv, SAM_EMAC_NCFGR, regval);
/* Check the PHY Address */
priv->phyaddr = CONFIG_SAM34_EMAC_PHYADDR;
ret = sam_phyfind(priv, &priv->phyaddr);
if (ret < 0)
{
nlldbg("ERROR: sam_phyfind failed: %d\n", ret);
return ret;
}
if (priv->phyaddr != CONFIG_SAM34_EMAC_PHYADDR)
{
sam_phyreset(priv);
}
return OK;
}
/****************************************************************************
* Function: sam_ethgpioconfig
*
* Description:
* Configure GPIOs for the EMAC MII interface.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* None.
*
* Assumptions:
*
****************************************************************************/
static inline void sam_ethgpioconfig(struct sam_emac_s *priv)
{
/* Configure PIO pins to support EMAC in MII mode*/
sam_configgpio(GPIO_EMAC_TXCK); /* Transmit Clock (or Reference Clock) */
sam_configgpio(GPIO_EMAC_TXEN); /* Transmit Enable */
sam_configgpio(GPIO_EMAC_TX0); /* Transmit data TXD0 */
sam_configgpio(GPIO_EMAC_TX1); /* Transmit data TXD1 */
sam_configgpio(GPIO_EMAC_TX2); /* Transmit data TXD2 */
sam_configgpio(GPIO_EMAC_TX3); /* Transmit data TXD3 */
//sam_configgpio(GPIO_EMAC_TXER); /* Transmit Coding Error */
sam_configgpio(GPIO_EMAC_RXCK); /* Receive Clock */
sam_configgpio(GPIO_EMAC_RXDV); /* Receive Data Valid */
sam_configgpio(GPIO_EMAC_RX0); /* Receive data RXD0 */
sam_configgpio(GPIO_EMAC_RX1); /* Receive data RXD0 */
sam_configgpio(GPIO_EMAC_RX2); /* Receive data RXD0 */
sam_configgpio(GPIO_EMAC_RX3); /* Receive data RXD0 */
sam_configgpio(GPIO_EMAC_RXER); /* Receive Error */
sam_configgpio(GPIO_EMAC_CRS); /* Carrier Sense and Data Valid */
sam_configgpio(GPIO_EMAC_COL); /* Collision Detect */
sam_configgpio(GPIO_EMAC_MDC); /* Management Data Clock */
sam_configgpio(GPIO_EMAC_MDIO); /* Management Data Input/Output */
}
/****************************************************************************
* Function: sam_txreset
*
* Description:
* Reset the transmit logic
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* None.
*
* Assumptions:
*
****************************************************************************/
static void sam_txreset(struct sam_emac_s *priv)
{
uint8_t *txbuffer = priv->txbuffer;
struct emac_txdesc_s *txdesc = priv->txdesc;
uintptr_t bufaddr;
uint32_t regval;
int ndx;
/* Disable TX */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_TXEN;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Configure the TX descriptors. */
priv->txhead = 0;
priv->txtail = 0;
for (ndx = 0; ndx < CONFIG_SAM34_EMAC_NTXBUFFERS; ndx++)
{
bufaddr = (uint32_t)(&(txbuffer[ndx * EMAC_TX_UNITSIZE]));
/* Set the buffer address and mark the descriptor as in used by firmware */
txdesc[ndx].addr = bufaddr;
txdesc[ndx].status = EMACTXD_STA_USED;
}
/* Mark the final descriptor in the list */
txdesc[CONFIG_SAM34_EMAC_NTXBUFFERS - 1].status =
EMACTXD_STA_USED | EMACTXD_STA_WRAP;
/* Set the Transmit Buffer Queue Pointer Register */
sam_putreg(priv, SAM_EMAC_TBQB, (uintptr_t)txdesc);
}
/****************************************************************************
* Function: sam_rxreset
*
* Description:
* Reset the receive logic
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* None.
*
* Assumptions:
*
****************************************************************************/
static void sam_rxreset(struct sam_emac_s *priv)
{
struct emac_rxdesc_s *rxdesc = priv->rxdesc;
uint8_t *rxbuffer = priv->rxbuffer;
uint32_t bufaddr;
uint32_t regval;
int ndx;
/* Disable RX */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval &= ~EMAC_NCR_RXEN;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Configure the RX descriptors. */
priv->rxndx = 0;
for (ndx = 0; ndx < CONFIG_SAM34_EMAC_NRXBUFFERS; ndx++)
{
bufaddr = (uintptr_t)(&(rxbuffer[ndx * EMAC_RX_UNITSIZE]));
DEBUGASSERT((bufaddr & ~EMACRXD_ADDR_MASK) == 0);
/* Set the buffer address and remove EMACRXD_ADDR_OWNER and
* EMACRXD_ADDR_WRAP.
*/
rxdesc[ndx].addr = bufaddr;
rxdesc[ndx].status = 0;
}
/* Mark the final descriptor in the list */
rxdesc[CONFIG_SAM34_EMAC_NRXBUFFERS - 1].addr |= EMACRXD_ADDR_WRAP;
/* Set the Receive Buffer Queue Pointer Register */
sam_putreg(priv, SAM_EMAC_RBQB, (uintptr_t)rxdesc);
}
/****************************************************************************
* Function: sam_emac_reset
*
* Description:
* Reset the EMAC block.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* None.
*
* Assumptions:
*
****************************************************************************/
static void sam_emac_reset(struct sam_emac_s *priv)
{
uint32_t regval;
/* Disable all EMAC interrupts */
sam_putreg(priv, SAM_EMAC_IDR, EMAC_INT_ALL);
/* Reset RX and TX logic */
sam_rxreset(priv);
sam_txreset(priv);
/* Disable RX, TX, and statistics */
regval = EMAC_NCR_TXEN | EMAC_NCR_RXEN | EMAC_NCR_WESTAT | EMAC_NCR_CLRSTAT;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Disable clocking to the EMAC peripheral */
sam_emac_disableclk();
}
/****************************************************************************
* Function: sam_macaddress
*
* Description:
* Configure the selected MAC address.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static void sam_macaddress(struct sam_emac_s *priv)
{
struct uip_driver_s *dev = &priv->dev;
uint32_t regval;
nllvdbg("%s MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
dev->d_ifname,
dev->d_mac.ether_addr_octet[0], dev->d_mac.ether_addr_octet[1],
dev->d_mac.ether_addr_octet[2], dev->d_mac.ether_addr_octet[3],
dev->d_mac.ether_addr_octet[4], dev->d_mac.ether_addr_octet[5]);
/* Set the MAC address */
regval = (uint32_t)dev->d_mac.ether_addr_octet[0] |
(uint32_t)dev->d_mac.ether_addr_octet[1] << 8 |
(uint32_t)dev->d_mac.ether_addr_octet[2] << 16 |
(uint32_t)dev->d_mac.ether_addr_octet[3] << 24;
sam_putreg(priv, SAM_EMAC_SAB1, regval);
regval = (uint32_t)dev->d_mac.ether_addr_octet[4] |
(uint32_t)dev->d_mac.ether_addr_octet[5] << 8;
sam_putreg(priv, SAM_EMAC_SAT1, regval);
}
/****************************************************************************
* Function: sam_emac_configure
*
* Description:
* Configure the EMAC interface for normal operation.
*
* Parameters:
* priv - A reference to the private driver state structure
*
* Returned Value:
* OK on success; Negated errno on failure.
*
* Assumptions:
*
****************************************************************************/
static int sam_emac_configure(struct sam_emac_s *priv)
{
uint32_t regval;
nllvdbg("Entry\n");
/* Enable clocking to the EMAC peripheral */
sam_emac_enableclk();
/* Disable TX, RX, interrupts, etc. */
sam_putreg(priv, SAM_EMAC_NCR, 0);
sam_putreg(priv, SAM_EMAC_IDR, EMAC_INT_ALL);
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= EMAC_NCR_CLRSTAT;
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Clear all status bits in the receive status register. */
regval = (EMAC_RSR_RXOVR | EMAC_RSR_REC | EMAC_RSR_BNA);
sam_putreg(priv, SAM_EMAC_RSR, regval);
/* Clear all status bits in the transmit status register */
regval = (EMAC_TSR_UBR | EMAC_TSR_COL | EMAC_TSR_RLE | EMAC_TSR_TFC |
EMAC_TSR_TXCOMP | EMAC_TSR_UND);
sam_putreg(priv, SAM_EMAC_TSR, regval);
/* Clear any pending interrupts */
(void)sam_getreg(priv, SAM_EMAC_ISR);
/* Enable/disable the copy of data into the buffers, ignore broadcasts.
* Don't copy FCS.
*/
regval = sam_getreg(priv, SAM_EMAC_NCFGR);
regval |= (EMAC_NCFGR_RFCS | EMAC_NCFGR_PEN);
#ifdef CONFIG_NET_PROMISCUOUS
regval |= EMAC_NCFGR_CAF;
#else
regval &= ~EMAC_NCFGR_CAF;
#endif
#ifdef CONFIG_SAM34_EMAC_NBC
regval |= EMAC_NCFGR_NBC;
#else
regval &= ~EMAC_NCFGR_NBC;
#endif
sam_putreg(priv, SAM_EMAC_NCFGR, regval);
/* Reset TX and RX */
sam_rxreset(priv);
sam_txreset(priv);
/* Enable Rx and Tx, plus the stats register. */
regval = sam_getreg(priv, SAM_EMAC_NCR);
regval |= (EMAC_NCR_RXEN | EMAC_NCR_TXEN | EMAC_NCR_WESTAT);
sam_putreg(priv, SAM_EMAC_NCR, regval);
/* Setup the interrupts for TX events, RX events, and error events */
regval = (EMAC_INT_RCOMP | EMAC_INT_RXUBR | EMAC_INT_TUR | EMAC_INT_RLEX |
EMAC_INT_TFC | EMAC_INT_TCOMP | EMAC_INT_ROVR | EMAC_INT_HRESP |
EMAC_INT_PFNX | EMAC_INT_PTZ);
sam_putreg(priv, SAM_EMAC_IER, regval);
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: up_netinitialize
*
* Description:
* Initialize the EMAC driver.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
* Assumptions:
* Called very early in the initialization sequence.
*
****************************************************************************/
void up_netinitialize(void)
{
struct sam_emac_s *priv = &g_emac;
int ret;
/* Initialize the driver structure */
memset(priv, 0, sizeof(struct sam_emac_s));
priv->dev.d_ifup = sam_ifup; /* I/F up (new IP address) callback */
priv->dev.d_ifdown = sam_ifdown; /* I/F down callback */
priv->dev.d_txavail = sam_txavail; /* New TX data callback */
#ifdef CONFIG_NET_IGMP
priv->dev.d_addmac = sam_addmac; /* Add multicast MAC address */
priv->dev.d_rmmac = sam_rmmac; /* Remove multicast MAC address */
#endif
priv->dev.d_private = (void*)&g_emac; /* Used to recover private state from dev */
/* Create a watchdog for timing polling for and timing of transmisstions */
priv->txpoll = wd_create();
if (!priv->txpoll)
{
nlldbg("ERROR: Failed to create periodic poll timer\n");
return;
}
priv->txtimeout = wd_create(); /* Create TX timeout timer */
if (!priv->txpoll)
{
nlldbg("ERROR: Failed to create periodic poll timer\n");
goto errout_with_txpoll;
}
/* Configure PIO pins to support EMAC MII */
sam_ethgpioconfig(priv);
/* Allocate buffers */
ret = sam_buffer_initialize(priv);
if (ret < 0)
{
nlldbg("ERROR: sam_buffer_initialize failed: %d\n", ret);
goto errout_with_txtimeout;
}
/* Attach the IRQ to the driver. It will not be enabled at the AIC until
* the interface is in the 'up' state.
*/
ret = irq_attach(SAM_IRQ_EMAC, sam_emac_interrupt);
if (ret < 0)
{
nlldbg("ERROR: Failed to attach the handler to the IRQ%d\n", SAM_IRQ_EMAC);
goto errout_with_buffers;
}
/* Enable clocking to the EMAC peripheral (just for sam_ifdown()) */
sam_emac_enableclk();
/* Put the interface in the down state (disabling clocking again). */
ret = sam_ifdown(&priv->dev);
if (ret < 0)
{
nlldbg("ERROR: Failed to put the interface in the down state: %d\n", ret);
goto errout_with_buffers;
}
/* Register the device with the OS so that socket IOCTLs can be performed */
ret = netdev_register(&priv->dev);
if (ret >= 0)
{
return;
}
nlldbg("ERROR: netdev_register() failed: %d\n", ret);
errout_with_buffers:
sam_buffer_free(priv);
errout_with_txtimeout:
wd_delete(priv->txtimeout);
errout_with_txpoll:
wd_delete(priv->txpoll);
}
#endif /* CONFIG_NET && CONFIG_SAM34_EMAC */
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