Added MAC low level driver for the TM4C129x. Tested on the TM4C1294 Connected Launchpad.

3 files changed, 1259 insertions, 1 deletions

diff --git a/os/hal/ports/TIVA/LLD/mac_lld.c b/os/hal/ports/TIVA/LLD/mac_lld.c
new file mode 100644
index 0000000..226695e
--- /dev/null
+++ b/os/hal/ports/TIVA/LLD/mac_lld.c
@@ -0,0 +1,823 @@
+/*
+    Copyright (C) 2014 Marco Veeneman
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    TIVA/mac_lld.c
+ * @brief   MAC Driver subsystem low level driver source.
+ *
+ * @addtogroup MAC
+ * @{
+ */
+
+#include <string.h>
+
+#include "hal.h"
+
+#if HAL_USE_MAC || defined(__DOXYGEN__)
+
+#include "mii.h"
+
+/*===========================================================================*/
+/* Driver local definitions.                                                 */
+/*===========================================================================*/
+
+#define BUFFER_SIZE ((((TIVA_MAC_BUFFERS_SIZE - 1) | 3) + 1) / 4)
+
+/* MII divider optimal value.*/
+#if (TIVA_SYSCLK >= 100000000)
+#define MACMIIADDR_CR   (0x01 << 2)
+#elif (TIVA_SYSCLK >= 60000000)
+#define MACMIIADDR_CR   (0x00 << 2)
+#elif (TIVA_SYSCLK >= 35000000)
+#define MACMIIADDR_CR   (0x03 << 2)
+#elif (TIVA_SYSCLK >= 20000000)
+#define MACMIIADDR_CR   (0x02 << 2)
+#else
+#error "TIVA_SYSCLK below minimum frequency for ETH operations (20MHz)"
+#endif
+
+#define EMAC_MIIADDR_MIIW       0x00000002  /* MII Write */
+#define EMAC_MIIADDR_MIIB       0x00000001  /* MII Busy */
+
+/*===========================================================================*/
+/* Driver exported variables.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief Ethernet driver 1.
+ */
+MACDriver ETHD1;
+
+/*===========================================================================*/
+/* Driver local variables and types.                                         */
+/*===========================================================================*/
+
+static const uint8_t default_mac_address[] = {0xAA, 0x55, 0x13,
+                                              0x37, 0x01, 0x10};
+
+static tiva_eth_rx_descriptor_t rd[TIVA_MAC_RECEIVE_BUFFERS];
+static tiva_eth_tx_descriptor_t td[TIVA_MAC_TRANSMIT_BUFFERS];
+
+static uint32_t rb[TIVA_MAC_RECEIVE_BUFFERS][BUFFER_SIZE];
+static uint32_t tb[TIVA_MAC_TRANSMIT_BUFFERS][BUFFER_SIZE];
+
+/*===========================================================================*/
+/* Driver local functions.                                                   */
+/*===========================================================================*/
+
+/**
+ * @brief   Writes a PHY register.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @param[in] reg       register number
+ * @param[in] value     new register value
+ *
+ * @notapi
+ */
+static void mii_write(MACDriver *macp, uint32_t reg, uint32_t value)
+{
+  ETH->MIIDATA = value;
+  ETH->MIIADDR = macp->phyaddr | (reg << 6) | MACMIIADDR_CR | EMAC_MIIADDR_MIIW | EMAC_MIIADDR_MIIB;
+
+  while ((ETH->MIIADDR & EMAC_MIIADDR_MIIB) != 0)
+    ;
+}
+
+/**
+ * @brief   Writes an extended PHY register.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @param[in] reg       register number
+ * @param[in] value     new register value
+ *
+ * @notapi
+ */
+static void mii_write_extended(MACDriver *macp, uint32_t reg, uint32_t value)
+{
+  mii_write(macp, TIVA_REGCTL, 0x001F);
+  mii_write(macp, TIVA_ADDAR, reg);
+
+  mii_write(macp, TIVA_REGCTL, 0x401F);
+  mii_write(macp, TIVA_ADDAR, value);
+}
+
+/**
+ * @brief   Reads a PHY register.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @param[in] reg       register number
+ *
+ * @return              The PHY register content.
+ *
+ * @notapi
+ */
+static uint32_t mii_read(MACDriver *macp, uint32_t reg)
+{
+  ETH->MIIADDR = macp->phyaddr | (reg << 6) | MACMIIADDR_CR | EMAC_MIIADDR_MIIB;
+
+  while ((ETH->MIIADDR & EMAC_MIIADDR_MIIB) != 0)
+    ;
+
+  return ETH->MIIDATA;
+}
+
+/**
+ * @brief   Reads an extended PHY register.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @param[in] reg       register number
+ *
+ * @return              The extended PHY register content.
+ *
+ * @notapi
+ */
+static uint32_t mii_read_extended(MACDriver *macp, uint32_t reg)
+{
+  mii_write(macp, TIVA_REGCTL, 0x001F);
+  mii_write(macp, TIVA_ADDAR, reg);
+
+  mii_write(macp, TIVA_REGCTL, 0x401F);
+  return mii_read(macp, TIVA_ADDAR);
+}
+
+#if !defined(BOARD_PHY_ADDRESS)
+/**
+ * @brief   PHY address detection.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ */
+static void mii_find_phy(MACDriver *macp)
+{
+  uint32_t i;
+
+#if TIVA_MAC_PHY_TIMEOUT > 0
+  rtcnt_t start = chSysGetRealtimeCounterX();
+  rtcnt_t timeout  = start + MS2RTC(STM32_HCLK,STM32_MAC_PHY_TIMEOUT);
+  rtcnt_t time = start;
+  while (chSysIsCounterWithinX(time, start, timeout)) {
+#endif
+    for (i = 0; i < 31; i++) {
+      macp->phyaddr = i << 11;
+      ETH->MIIDATA = (i << 6) | MACMIIADDR_CR;
+      if ((mii_read(macp, TIVA_ID1) == (BOARD_PHY_ID >> 16)) &&
+          ((mii_read(macp, TIVA_ID2) & 0xFFF0) == (BOARD_PHY_ID & 0xFFF0))) {
+        return;
+      }
+    }
+#if TIVA_MAC_PHY_TIMEOUT > 0
+    time = chSysGetRealtimeCounterX();
+  }
+#endif
+  /* Wrong or defective board.*/
+  osalSysHalt("MAC failure");
+}
+#endif
+
+/**
+ * @brief   MAC address setup.
+ *
+ * @param[in] p         pointer to a six bytes buffer containing the MAC
+ *                      address
+ */
+static void mac_lld_set_address(const uint8_t *p)
+{
+  /* MAC address configuration, only a single address comparator is used,
+     hash table not used.*/
+  ETH->ADDR0H   = ((uint32_t)p[5] << 8) |
+                  ((uint32_t)p[4] << 0);
+  ETH->ADDR0L   = ((uint32_t)p[3] << 24) |
+                  ((uint32_t)p[2] << 16) |
+                  ((uint32_t)p[1] << 8) |
+                  ((uint32_t)p[0] << 0);
+  ETH->ADDR1H   = 0x0000FFFF;
+  ETH->ADDR1L   = 0xFFFFFFFF;
+  ETH->ADDR2H   = 0x0000FFFF;
+  ETH->ADDR2L   = 0xFFFFFFFF;
+  ETH->ADDR3H   = 0x0000FFFF;
+  ETH->ADDR3L   = 0xFFFFFFFF;
+  ETH->HASHTBLH = 0;
+  ETH->HASHTBLL = 0;
+}
+
+/*===========================================================================*/
+/* Driver interrupt handlers.                                                */
+/*===========================================================================*/
+
+CH_IRQ_HANDLER(TIVA_MAC_HANDLER)
+{
+  uint32_t dmaris;
+
+  CH_IRQ_PROLOGUE();
+
+  dmaris = ETH->DMARIS;
+  ETH->DMARIS = dmaris & 0x0001FFFF; /* Clear status bits.*/
+
+  if (dmaris & (1 << 6)) {
+    /* Data Received.*/
+    osalSysLockFromISR();
+    osalThreadDequeueAllI(&ETHD1.rdqueue, MSG_RESET);
+#if MAC_USE_EVENTS
+    osalEventBroadcastFlagsI(&ETHD1.rdevent, 0);
+#endif
+    osalSysUnlockFromISR();
+  }
+
+  if (dmaris & (1 << 0)) {
+    /* Data Transmitted.*/
+    osalSysLockFromISR();
+    osalThreadDequeueAllI(&ETHD1.tdqueue, MSG_RESET);
+    osalSysUnlockFromISR();
+  }
+
+  CH_IRQ_EPILOGUE();
+}
+
+/*===========================================================================*/
+/* Driver exported functions.                                                */
+/*===========================================================================*/
+
+/**
+ * @brief   Low level MAC initialization.
+ *
+ * @notapi
+ */
+void mac_lld_init(void)
+{
+  uint8_t i;
+
+  macObjectInit(&ETHD1);
+  ETHD1.link_up = false;
+
+  /* Descriptor tables are initialized in chained mode, note that the first
+     word is not initialized here but in mac_lld_start().*/
+  for (i = 0; i < TIVA_MAC_RECEIVE_BUFFERS; i++) {
+    rd[i].rdes1 = TIVA_RDES1_RCH | TIVA_RDES1_RBS1(TIVA_MAC_BUFFERS_SIZE);
+    rd[i].rdes2 = (uint32_t)rb[i];
+    rd[i].rdes3 = (uint32_t)&rd[(i + 1) % TIVA_MAC_RECEIVE_BUFFERS];
+  }
+  for (i = 0; i < TIVA_MAC_TRANSMIT_BUFFERS; i++) {
+    td[i].tdes1 = 0;
+    td[i].tdes2 = (uint32_t)tb[i];
+    td[i].tdes3 = (uint32_t)&td[(i + 1) % TIVA_MAC_TRANSMIT_BUFFERS];
+  }
+
+  /* Enable MAC clock */
+  SYSCTL->RCGCEMAC = 1;
+  while (SYSCTL->PREMAC != 0x01)
+    ;
+
+  /* Set PHYHOLD bit */
+  ETH->PC |= 1;
+
+  /* Enable PHY clock */
+  SYSCTL->RCGCEPHY = 1;
+  while (SYSCTL->PREPHY != 0x01)
+    ;
+
+  /* Enable power to PHY */
+  SYSCTL->PCEPHY |= 1;
+  while (SYSCTL->PREPHY != 0x01)
+    ;
+#if BOARD_PHY_RMII
+  ETH->PC = EMAC_PHY_CONFIG | (0x04 << 28);
+#else
+  ETH->PC = EMAC_PHY_CONFIG;
+#endif
+
+  /*
+   * Write OHY led configuration.
+   * 0: link ok
+   * 1: tx activity
+   * 2: link ok
+   * blink rate: 20Hz
+   */
+  mii_write_extended(&ETHD1, TIVA_LEDCFG, (0 << 8) | (2 << 4) | (0 << 0));
+  mii_write(&ETHD1, TIVA_LEDCR, (0 << 9));
+
+  /* Set done bit after writing EMACPC register */
+  mii_write(&ETHD1, TIVA_CFG1, (1 << 15) | mii_read(&ETHD1, TIVA_CFG1));
+
+  while(ETH->DMABUSMOD & 1)
+    ;
+
+  /* Reset MAC */
+  ETH->DMABUSMOD |= 1;
+  while (ETH->DMABUSMOD & 1)
+    ;
+
+  /* PHY address setup.*/
+#if defined(BOARD_PHY_ADDRESS)
+  ETHD1.phyaddr = BOARD_PHY_ADDRESS << 11;
+#else
+  mii_find_phy(&ETHD1);
+#endif
+
+#if defined(BOARD_PHY_RESET)
+  /* PHY board-specific reset procedure.*/
+  BOARD_PHY_RESET();
+#else
+  /* PHY soft reset procedure.*/
+  mii_write(&ETHD1, MII_BMCR, BMCR_RESET);
+#if defined(BOARD_PHY_RESET_DELAY)
+  chSysPolledDelayX(BOARD_PHY_RESET_DELAY);
+#endif
+  while (mii_read(&ETHD1, MII_BMCR) & BMCR_RESET)
+    ;
+#endif
+
+#if TIVA_MAC_CHANGE_PHY_STATE
+  /* PHY in power down mode until the driver will be started.*/
+  mii_write(&ETHD1, MII_BMCR, mii_read(&ETHD1, MII_BMCR) | BMCR_PDOWN);
+#endif
+
+  /* Disable MAC clock */
+  SYSCTL->RCGCEMAC = 0;
+
+  /* Disable PHY clock */
+  SYSCTL->RCGCEPHY = 0;
+}
+
+/**
+ * @brief   Configures and activates the MAC peripheral.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ *
+ * @notapi
+ */
+void mac_lld_start(MACDriver *macp)
+{
+  uint8_t i;
+
+  /* Resets the state of all descriptors.*/
+  for (i = 0; i < TIVA_MAC_RECEIVE_BUFFERS; i++) {
+    rd[i].rdes0 = TIVA_RDES0_OWN;
+  }
+  macp->rxptr = (tiva_eth_rx_descriptor_t *)rd;
+
+  for (i = 0; i < TIVA_MAC_TRANSMIT_BUFFERS; i++) {
+    td[i].tdes0 = TIVA_TDES0_TCH;
+    td[i].locked = 0;
+  }
+  macp->txptr = (tiva_eth_tx_descriptor_t *)td;
+
+  /* Enable MAC clock */
+  SYSCTL->RCGCEMAC = 1;
+  while (SYSCTL->PREMAC != 0x01)
+    ;
+
+  /* Enable PHY clock */
+  SYSCTL->RCGCEPHY = 1;
+  while (!SYSCTL->PREPHY)
+    ;
+
+  /* ISR vector enabled.*/
+  nvicEnableVector(TIVA_MAC_NUMBER, TIVA_MAC_IRQ_PRIORITY);
+
+#if TIVA_MAC_CHANGE_PHY_STATE
+  /* PHY in power up mode.*/
+  mii_write(macp, MII_BMCR, mii_read(macp, MII_BMCR) & ~BMCR_PDOWN);
+#endif
+
+  /* MAC configuration.*/
+  ETH->FRAMEFLTR = 0;
+  ETH->FLOWCTL = 0;
+  ETH->VLANTG = 0;
+
+  /* MAC address setup.*/
+  if (macp->config->mac_address == NULL)
+    mac_lld_set_address(default_mac_address);
+  else
+    mac_lld_set_address(macp->config->mac_address);
+
+  /* Transmitter and receiver enabled.
+     Note that the complete setup of the MAC is performed when the link
+     status is detected.*/
+#if TIVA_MAC_IP_CHECKSUM_OFFLOAD
+  ETH->CFG = (1 << 10) | (1 << 3) | (1 << 2);
+#else
+  ETH->CFG =             (1 << 3) | (1 << 2);
+#endif
+
+  /* DMA configuration:
+     Descriptor chains pointers.*/
+  ETH->RXDLADDR = (uint32_t)rd;
+  ETH->TXDLADDR = (uint32_t)td;
+
+  /* Enabling required interrupt sources.*/
+  ETH->DMARIS &= 0xFFFF;
+  ETH->DMAIM = (1 << 16) | (1 << 6) | (1 << 0);
+
+  /* DMA general settings.*/
+  ETH->DMABUSMOD = (1 << 25) | (1 << 17) | (1 << 8);
+
+  /* Transmit FIFO flush.*/
+  ETH->DMAOPMODE = (1 << 20);
+  while (ETH->DMAOPMODE & (1 << 20))
+    ;
+
+  /* DMA final configuration and start.*/
+  ETH->DMAOPMODE = (1 << 26) | (1 << 25) | (1 << 21) |
+                        (1 << 13) | (1 << 1);
+}
+
+/**
+ * @brief   Deactivates the MAC peripheral.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ *
+ * @notapi
+ */
+void mac_lld_stop(MACDriver *macp)
+{
+  if (macp->state != MAC_STOP) {
+#if TIVA_MAC_CHANGE_PHY_STATE
+    /* PHY in power down mode until the driver will be restarted.*/
+    mii_write(macp, MII_BMCR, mii_read(macp, MII_BMCR) | BMCR_PDOWN);
+#endif
+
+    /* MAC and DMA stopped.*/
+    ETH->CFG = 0;
+    ETH->DMAOPMODE = 0;
+    ETH->DMAIM = 0;
+    ETH->DMARIS &= 0xFFFF;
+
+    /* MAC clocks stopped.*/
+    SYSCTL->RCGCEMAC = 0;
+
+    /* PHY clock stopped.*/
+    SYSCTL->RCGCEPHY = 0;
+
+    /* ISR vector disabled.*/
+    nvicDisableVector(TIVA_MAC_NUMBER);
+  }
+}
+
+/**
+ * @brief   Returns a transmission descriptor.
+ * @details One of the available transmission descriptors is locked and
+ *          returned.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @param[out] tdp      pointer to a @p MACTransmitDescriptor structure
+ * @return              The operation status.
+ * @retval RDY_OK       the descriptor has been obtained.
+ * @retval RDY_TIMEOUT  descriptor not available.
+ *
+ * @notapi
+ */
+msg_t mac_lld_get_transmit_descriptor(MACDriver *macp,
+                                      MACTransmitDescriptor *tdp)
+{
+  tiva_eth_tx_descriptor_t *tdes;
+
+  if (!macp->link_up)
+    return MSG_TIMEOUT;
+
+  osalSysLock();
+
+  /* Get Current TX descriptor.*/
+  tdes = macp->txptr;
+
+  /* Ensure that descriptor isn't owned by the Ethernet DMA or locked by
+     another thread.*/
+  if (tdes->tdes0 & (TIVA_TDES0_OWN) || (tdes->locked)) {
+    osalSysUnlock();
+    return MSG_TIMEOUT;
+  }
+
+  /* Marks the current descriptor as locked.*/
+  tdes->locked = 1;
+
+  /* Next TX descriptor to use.*/
+  macp->txptr = (tiva_eth_tx_descriptor_t *)tdes->tdes3;
+
+  osalSysUnlock();
+
+  /* Set the buffer size and configuration.*/
+  tdp->offset   = 0;
+  tdp->size     = TIVA_MAC_BUFFERS_SIZE;
+  tdp->physdesc = tdes;
+
+  return MSG_OK;
+}
+
+/**
+ * @brief   Releases a transmit descriptor and starts the transmission of the
+ *          enqueued data as a single frame.
+ *
+ * @param[in] tdp       the pointer to the @p MACTransmitDescriptor structure
+ *
+ * @notapi
+ */
+void mac_lld_release_transmit_descriptor(MACTransmitDescriptor *tdp)
+{
+  osalDbgAssert(!(tdp->physdesc->tdes0 & TIVA_TDES0_OWN),
+              "attempt to release descriptor already owned by DMA");
+
+  osalSysLock();
+
+  /* Unlocks the descriptor and returns it to the DMA engine.*/
+  tdp->physdesc->tdes1 = tdp->offset;
+  tdp->physdesc->tdes0 = TIVA_TDES0_CIC(TIVA_MAC_IP_CHECKSUM_OFFLOAD) |
+                         TIVA_TDES0_IC | TIVA_TDES0_LS | TIVA_TDES0_FS |
+                         TIVA_TDES0_TCH | TIVA_TDES0_OWN;
+  tdp->physdesc->locked = 0;
+
+  /* If the DMA engine is stalled then a restart request is issued.*/
+  if ((ETH->DMARIS & (0x7 << 20)) == (6 << 20)) {
+    ETH->DMARIS   = (1 << 2);
+    ETH->TXPOLLD = 1; /* Any value is OK.*/
+  }
+
+  osalSysUnlock();
+}
+
+/**
+ * @brief   Returns a receive descriptor.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @param[out] rdp      pointer to a @p MACReceiveDescriptor structure
+ * @return              The operation status.
+ * @retval RDY_OK       the descriptor has been obtained.
+ * @retval RDY_TIMEOUT  descriptor not available.
+ *
+ * @notapi
+ */
+msg_t mac_lld_get_receive_descriptor(MACDriver *macp,
+                                     MACReceiveDescriptor *rdp)
+{
+  tiva_eth_rx_descriptor_t *rdes;
+
+  osalSysLock();
+
+  /* Get Current RX descriptor.*/
+  rdes = macp->rxptr;
+
+  /* Iterates through received frames until a valid one is found, invalid
+     frames are discarded.*/
+  while (!(rdes->rdes0 & TIVA_RDES0_OWN)) {
+    if (!(rdes->rdes0 & (TIVA_RDES0_AFM | TIVA_RDES0_ES))
+#if TIVA_MAC_IP_CHECKSUM_OFFLOAD
+        && (rdes->rdes0 & TIVA_RDES0_FT)
+        && !(rdes->rdes0 & (TIVA_RDES0_IPHCE | TIVA_RDES0_PCE))
+#endif
+        && (rdes->rdes0 & TIVA_RDES0_FS) && (rdes->rdes0 & TIVA_RDES0_LS)) {
+      /* Found a valid one.*/
+      rdp->offset   = 0;
+      rdp->size     = ((rdes->rdes0 & TIVA_RDES0_FL_MASK) >> 16) - 4;
+      rdp->physdesc = rdes;
+      macp->rxptr   = (tiva_eth_rx_descriptor_t *)rdes->rdes3;
+
+      osalSysUnlock();
+      return MSG_OK;
+    }
+    /* Invalid frame found, purging.*/
+    rdes->rdes0 = TIVA_RDES0_OWN;
+    rdes = (tiva_eth_rx_descriptor_t *)rdes->rdes3;
+  }
+
+  /* Next descriptor to check.*/
+  macp->rxptr = rdes;
+
+  osalSysUnlock();
+  return MSG_TIMEOUT;
+}
+
+/**
+ * @brief   Releases a receive descriptor.
+ * @details The descriptor and its buffer are made available for more incoming
+ *          frames.
+ *
+ * @param[in] rdp       the pointer to the @p MACReceiveDescriptor structure
+ *
+ * @notapi
+ */
+void mac_lld_release_receive_descriptor(MACReceiveDescriptor *rdp)
+{
+  osalDbgAssert(!(rdp->physdesc->rdes0 & TIVA_RDES0_OWN),
+              "attempt to release descriptor already owned by DMA");
+
+  osalSysLock();
+
+  /* Give buffer back to the Ethernet DMA.*/
+  rdp->physdesc->rdes0 = TIVA_RDES0_OWN;
+
+  /* If the DMA engine is stalled then a restart request is issued.*/
+  if ((ETH->STATUS & (0xf << 17)) == (4 << 17)) {
+    ETH->DMARIS   = (1 << 7);
+    ETH->TXPOLLD = 1; /* Any value is OK.*/
+  }
+
+  osalSysUnlock();
+}
+
+/**
+ * @brief   Updates and returns the link status.
+ *
+ * @param[in] macp      pointer to the @p MACDriver object
+ * @return              The link status.
+ * @retval TRUE         if the link is active.
+ * @retval FALSE        if the link is down.
+ *
+ * @notapi
+ */
+bool mac_lld_poll_link_status(MACDriver *macp)
+{
+  uint32_t maccfg, bmsr, bmcr;
+
+  maccfg = ETH->CFG;
+
+  /* PHY CR and SR registers read.*/
+  (void)mii_read(macp, MII_BMSR);
+  bmsr = mii_read(macp, MII_BMSR);
+  bmcr = mii_read(macp, MII_BMCR);
+
+  /* Check on auto-negotiation mode.*/
+  if (bmcr & BMCR_ANENABLE) {
+    uint32_t lpa;
+
+    /* Auto-negotiation must be finished without faults and link established.*/
+    if ((bmsr & (BMSR_LSTATUS | BMSR_RFAULT | BMSR_ANEGCOMPLETE)) !=
+        (BMSR_LSTATUS | BMSR_ANEGCOMPLETE))
+      return macp->link_up = false;
+
+    /* Auto-negotiation enabled, checks the LPA register.*/
+    lpa = mii_read(macp, MII_LPA);
+
+    /* Check on link speed.*/
+    if (lpa & (LPA_100HALF | LPA_100FULL | LPA_100BASE4))
+      maccfg |= (1 << 14);
+    else
+      maccfg &= ~(1 << 14);
+
+    /* Check on link mode.*/
+    if (lpa & (LPA_10FULL | LPA_100FULL))
+      maccfg |= (1 << 11);
+    else
+      maccfg &= ~(1 << 11);
+  }
+  else {
+    /* Link must be established.*/
+    if (!(bmsr & BMSR_LSTATUS))
+      return macp->link_up = false;
+
+    /* Check on link speed.*/
+    if (bmcr & BMCR_SPEED100)
+      maccfg |= (1 << 14);
+    else
+      maccfg &= ~(1 << 14);
+
+    /* Check on link mode.*/
+    if (bmcr & BMCR_FULLDPLX)
+      maccfg |= (1 << 11);
+    else
+      maccfg &= ~(1 << 11);
+  }
+
+  /* Changes the mode in the MAC.*/
+  ETH->CFG = maccfg;
+
+  /* Returns the link status.*/
+  return macp->link_up = true;
+}
+
+/**
+ * @brief   Writes to a transmit descriptor's stream.
+ *
+ * @param[in] tdp       pointer to a @p MACTransmitDescriptor structure
+ * @param[in] buf       pointer to the buffer containing the data to be
+ *                      written
+ * @param[in] size      number of bytes to be written
+ * @return              The number of bytes written into the descriptor's
+ *                      stream, this value can be less than the amount
+ *                      specified in the parameter @p size if the maximum
+ *                      frame size is reached.
+ *
+ * @notapi
+ */
+size_t mac_lld_write_transmit_descriptor(MACTransmitDescriptor *tdp,
+                                         uint8_t *buf,
+                                         size_t size)
+{
+  osalDbgAssert(!(tdp->physdesc->tdes0 & TIVA_TDES0_OWN),
+              "attempt to write descriptor already owned by DMA");
+
+  if (size > tdp->size - tdp->offset)
+    size = tdp->size - tdp->offset;
+
+  if (size > 0) {
+    memcpy((uint8_t *)(tdp->physdesc->tdes2) + tdp->offset, buf, size);
+    tdp->offset += size;
+  }
+  return size;
+}
+
+/**
+ * @brief   Reads from a receive descriptor's stream.
+ *
+ * @param[in] rdp       pointer to a @p MACReceiveDescriptor structure
+ * @param[in] buf       pointer to the buffer that will receive the read data
+ * @param[in] size      number of bytes to be read
+ * @return              The number of bytes read from the descriptor's
+ *                      stream, this value can be less than the amount
+ *                      specified in the parameter @p size if there are
+ *                      no more bytes to read.
+ *
+ * @notapi
+ */
+size_t mac_lld_read_receive_descriptor(MACReceiveDescriptor *rdp,
+                                       uint8_t *buf,
+                                       size_t size)
+{
+  osalDbgAssert(!(rdp->physdesc->rdes0 & TIVA_RDES0_OWN),
+              "attempt to read descriptor already owned by DMA");
+
+  if (size > rdp->size - rdp->offset)
+    size = rdp->size - rdp->offset;
+
+  if (size > 0) {
+    memcpy(buf, (uint8_t *)(rdp->physdesc->rdes2) + rdp->offset, size);
+    rdp->offset += size;
+  }
+  return size;
+}
+
+#if MAC_USE_ZERO_COPY || defined(__DOXYGEN__)
+/**
+ * @brief   Returns a pointer to the next transmit buffer in the descriptor
+ *          chain.
+ * @note    The API guarantees that enough buffers can be requested to fill
+ *          a whole frame.
+ *
+ * @param[in] tdp       pointer to a @p MACTransmitDescriptor structure
+ * @param[in] size      size of the requested buffer. Specify the frame size
+ *                      on the first call then scale the value down subtracting
+ *                      the amount of data already copied into the previous
+ *                      buffers.
+ * @param[out] sizep    pointer to variable receiving the buffer size, it is
+ *                      zero when the last buffer has already been returned.
+ *                      Note that a returned size lower than the amount
+ *                      requested means that more buffers must be requested
+ *                      in order to fill the frame data entirely.
+ * @return              Pointer to the returned buffer.
+ * @retval NULL         if the buffer chain has been entirely scanned.
+ *
+ * @notapi
+ */
+uint8_t *mac_lld_get_next_transmit_buffer(MACTransmitDescriptor *tdp,
+                                          size_t size,
+                                          size_t *sizep)
+{
+  if (tdp->offset == 0) {
+    *sizep      = tdp->size;
+    tdp->offset = size;
+    return (uint8_t *)tdp->physdesc->tdes2;
+  }
+  *sizep = 0;
+  return NULL;
+}
+
+/**
+ * @brief   Returns a pointer to the next receive buffer in the descriptor
+ *          chain.
+ * @note    The API guarantees that the descriptor chain contains a whole
+ *          frame.
+ *
+ * @param[in] rdp       pointer to a @p MACReceiveDescriptor structure
+ * @param[out] sizep    pointer to variable receiving the buffer size, it is
+ *                      zero when the last buffer has already been returned.
+ * @return              Pointer to the returned buffer.
+ * @retval NULL         if the buffer chain has been entirely scanned.
+ *
+ * @notapi
+ */
+const uint8_t *mac_lld_get_next_receive_buffer(MACReceiveDescriptor *rdp,
+                                               size_t *sizep)
+{
+  if (rdp->size > 0) {
+    *sizep      = rdp->size;
+    rdp->offset = rdp->size;
+    rdp->size   = 0;
+    return (uint8_t *)rdp->physdesc->rdes2;
+  }
+  *sizep = 0;
+  return NULL;
+}
+#endif /* MAC_USE_ZERO_COPY */
+
+#endif /* HAL_USE_MAC */
+
+/** @} */
diff --git a/os/hal/ports/TIVA/LLD/mac_lld.h b/os/hal/ports/TIVA/LLD/mac_lld.h
new file mode 100644
index 0000000..7c86dbd
--- /dev/null
+++ b/os/hal/ports/TIVA/LLD/mac_lld.h
@@ -0,0 +1,434 @@
+/*
+    Copyright (C) 2014 Marco Veeneman
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+/**
+ * @file    TIVA/mac_lld.h
+ * @brief   MAC Driver subsystem low level driver header.
+ *
+ * @addtogroup MAC
+ * @{
+ */
+
+#ifndef _MAC_LLD_H_
+#define _MAC_LLD_H_
+
+#if HAL_USE_MAC || defined(__DOXYGEN__)
+
+/*===========================================================================*/
+/* Driver constants.                                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   This implementation supports the zero-copy mode API.
+ */
+#define MAC_SUPPORTS_ZERO_COPY      TRUE
+
+/**
+ * @name    RDES0 constants
+ * @{
+ */
+#define TIVA_RDES0_OWN              0x80000000
+#define TIVA_RDES0_AFM              0x40000000
+
+#define TIVA_RDES0_FL_MASK          0x3FFF0000
+#define TIVA_RDES0_FL(n)            ((n) << 16)
+
+#define TIVA_RDES0_ES               0x00008000
+#define TIVA_RDES0_DESERR           0x00004000
+#define TIVA_RDES0_SAF              0x00002000
+#define TIVA_RDES0_LE               0x00001000
+#define TIVA_RDES0_OE               0x00000800
+#define TIVA_RDES0_VLAN             0x00000400
+#define TIVA_RDES0_FS               0x00000200
+#define TIVA_RDES0_LS               0x00000100
+#define TIVA_RDES0_TAGF             0x00000080
+#define TIVA_RDES0_LC               0x00000040
+#define TIVA_RDES0_FT               0x00000020
+#define TIVA_RDES0_RWT              0x00000010
+#define TIVA_RDES0_RE               0x00000008
+#define TIVA_RDES0_DE               0x00000004
+#define TIVA_RDES0_CE               0x00000002
+#define TIVA_RDES0_ESA              0x00000001
+/** @} */
+
+/**
+ * @name    RDES1 constants
+ * @{
+ */
+#define TIVA_RDES1_DIC              0x80000000
+
+#define TIVA_RDES1_RBS2_MASK        0x1FFF0000
+#define TIVA_RDES1_RBS2(n)          ((n) << 16)
+
+#define TIVA_RDES1_RER              0x00008000
+#define TIVA_RDES1_RCH              0x00004000
+
+#define TIVA_RDES1_RBS1_MASK        0x00001FFF
+#define TIVA_RDES1_RBS1(n)          ((n) << 0)
+
+/** @} */
+
+/**
+ * @name    TDES0 constants
+ * @{
+ */
+#define TIVA_TDES0_OWN              0x80000000
+#define TIVA_TDES0_IC               0x40000000
+#define TIVA_TDES0_LS               0x20000000
+#define TIVA_TDES0_FS               0x10000000
+#define TIVA_TDES0_DC               0x08000000
+#define TIVA_TDES0_DP               0x04000000
+#define TIVA_TDES0_TTSE             0x02000000
+#define TIVA_TDES0_CRCR             0x01000000
+
+#define TIVA_TDES0_CIC_MASK         0x00C00000
+#define TIVA_TDES0_CIC(n)           ((n) << 22)
+
+#define TIVA_TDES0_TER              0x00200000
+#define TIVA_TDES0_TCH              0x00100000
+#define TIVA_TDES0_VLIC             0x000C0000
+#define TIVA_TDES0_TTSS             0x00020000
+#define TIVA_TDES0_IHE              0x00010000
+#define TIVA_TDES0_ES               0x00008000
+#define TIVA_TDES0_JT               0x00004000
+#define TIVA_TDES0_FF               0x00002000
+#define TIVA_TDES0_IPE              0x00001000
+#define TIVA_TDES0_LC               0x00000800
+#define TIVA_TDES0_NC               0x00000400
+#define TIVA_TDES0_LCO              0x00000200
+#define TIVA_TDES0_EC               0x00000100
+#define TIVA_TDES0_VF               0x00000080
+
+#define TIVA_TDES0_CC_MASK          0x00000078
+#define TIVA_TDES0_CC(n)            ((n) << 3)
+
+#define TIVA_TDES0_ED               0x00000004
+#define TIVA_TDES0_UF               0x00000002
+#define TIVA_TDES0_DB               0x00000001
+/** @} */
+
+/**
+ * @name    TDES1 constants
+ * @{
+ */
+#define TIVA_TDES1_SAIC_MASK        0xE0000000
+#define TIVA_TDES1_SAIC(n)          ((n) << 29)
+
+#define TIVA_TDES1_TBS2_MASK        0x1FFF0000
+#define TIVA_TDES1_TBS2(n)          ((n) << 16)
+
+#define TIVA_TDES1_TBS1_MASK        0x00001FFF
+#define TIVA_TDES1_TBS1(n)          ((n) << 0)
+/** @} */
+
+
+
+
+/**
+ * @name    Ethernet PHY registers
+ */
+#define TIVA_BMCR                   0x00000000  /* MR0  - Basic Mode Control     */
+#define TIVA_BMSR                   0x00000001  /* MR1  - Basic Mode Status      */
+#define TIVA_ID1                    0x00000002  /* MR2  - Identifier Register 1  */
+#define TIVA_ID2                    0x00000003  /* MR3  - Identifier Register 2  */
+#define TIVA_ANA                    0x00000004  /* MR4  - Auto-Negotiation Advertisement */
+#define TIVA_ANLPA                  0x00000005  /* MR5  - Auto-Negotiation Link Partner Ability */
+#define TIVA_ANER                   0x00000006  /* MR6  - Auto-Negotiation Expansion */
+#define TIVA_ANNPTR                 0x00000007  /* MR7  - Auto-Negotiation Next Page TX */
+#define TIVA_ANLNPTR                0x00000008  /* MR8  - Auto-Negotiation Link Partner Ability Next Page */
+#define TIVA_CFG1                   0x00000009  /* MR9  - Configuration 1        */
+#define TIVA_CFG2                   0x0000000A  /* MR10 - Configuration 2        */
+#define TIVA_CFG3                   0x0000000B  /* MR11 - Configuration 3        */
+#define TIVA_REGCTL                 0x0000000D  /* MR13 - Register Control       */
+#define TIVA_ADDAR                  0x0000000E  /* MR14 - Address or Data        */
+#define TIVA_STS                    0x00000010  /* MR16 - Status                 */
+#define TIVA_SCR                    0x00000011  /* MR17 - Specific Control       */
+#define TIVA_MISR1                  0x00000012  /* MR18 - MII Interrupt Status 1 */
+#define TIVA_MISR2                  0x00000013  /* MR19 - MII Interrupt Status 2 */
+#define TIVA_FCSCR                  0x00000014  /* MR20 - False Carrier Sense Counter */
+#define TIVA_RXERCNT                0x00000015  /* MR21 - Receive Error Count    */
+#define TIVA_BISTCR                 0x00000016  /* MR22 - BIST Control           */
+#define TIVA_LEDCR                  0x00000018  /* MR24 - LED Control            */
+#define TIVA_CTL                    0x00000019  /* MR25 - Control                */
+#define TIVA_10BTSC                 0x0000001A  /* MR26 - 10Base-T Status/Control - MR26 */
+#define TIVA_BICSR1                 0x0000001B  /* MR27 - BIST Control and Status 1 */
+#define TIVA_BICSR2                 0x0000001C  /* MR28 - BIST Control and Status 2 */
+#define TIVA_CDCR                   0x0000001E  /* MR30 - Cable Diagnostic Control */
+#define TIVA_RCR                    0x0000001F  /* MR31 - Reset Control          */
+#define TIVA_LEDCFG                 0x00000025  /* MR37 - LED Configuration      */
+/** @} */
+
+/*===========================================================================*/
+/* Driver pre-compile time settings.                                         */
+/*===========================================================================*/
+
+/**
+ * @name    Configuration options
+ * @{
+ */
+/**
+ * @brief   Number of available transmit buffers.
+ */
+#if !defined(TIVA_MAC_TRANSMIT_BUFFERS) || defined(__DOXYGEN__)
+#define TIVA_MAC_TRANSMIT_BUFFERS           2
+#endif
+
+/**
+ * @brief   Number of available receive buffers.
+ */
+#if !defined(TIVA_MAC_RECEIVE_BUFFERS) || defined(__DOXYGEN__)
+#define TIVA_MAC_RECEIVE_BUFFERS            4
+#endif
+
+/**
+ * @brief   Maximum supported frame size.
+ */
+#if !defined(TIVA_MAC_BUFFERS_SIZE) || defined(__DOXYGEN__)
+#define TIVA_MAC_BUFFERS_SIZE               1522
+#endif
+
+/**
+ * @brief   PHY detection timeout.
+ * @details Timeout, in milliseconds, for PHY address detection, if a PHY
+ *          is not detected within the timeout then the driver halts during
+ *          initialization. This setting applies only if the PHY address is
+ *          not explicitly set in the board header file using
+ *          @p BOARD_PHY_ADDRESS. A zero value disables the timeout and a
+ *          single search path is performed.
+ */
+#if !defined(TIVA_MAC_PHY_TIMEOUT) || defined(__DOXYGEN__)
+#define TIVA_MAC_PHY_TIMEOUT                0
+#endif
+
+/**
+ * @brief   Change the PHY power state inside the driver.
+ */
+#if !defined(TIVA_MAC_CHANGE_PHY_STATE) || defined(__DOXYGEN__)
+#define TIVA_MAC_CHANGE_PHY_STATE           TRUE
+#endif
+
+/**
+ * @brief   ETHD1 interrupt priority level setting.
+ */
+#if !defined(TIVA_MAC_IRQ_PRIORITY) || defined(__DOXYGEN__)
+#define TIVA_MAC_IRQ_PRIORITY               5
+#endif
+
+/**
+ * @brief   IP checksum offload.
+ * @details The following modes are available:
+ *          - 0 Function disabled.
+ *          - 1 Only IP header checksum calculation and insertion are enabled.
+ *          - 2 IP header checksum and payload checksum calculation and
+ *              insertion are enabled, but pseudo-header checksum is not
+ *              calculated in hardware.
+ *          - 3 IP Header checksum and payload checksum calculation and
+ *              insertion are enabled, and pseudo-header checksum is
+ *              calculated in hardware.
+ *          .
+ */
+#if !defined(TIVA_MAC_IP_CHECKSUM_OFFLOAD) || defined(__DOXYGEN__)
+#define TIVA_MAC_IP_CHECKSUM_OFFLOAD        0
+#endif
+/** @} */
+
+#ifndef EMAC_PHY_CONFIG
+#define EMAC_PHY_CONFIG         ((0 << 31) | \
+                                 (1 << 23) | \
+                                 (1 << 10) | \
+                                 (1 << 3)  | \
+                                 (3 << 1)  | \
+                                 (1 << 0))
+#endif
+
+/*===========================================================================*/
+/* Derived constants and error checks.                                       */
+/*===========================================================================*/
+
+#if (TIVA_MAC_PHY_TIMEOUT > 0) && !HAL_IMPLEMENTS_COUNTERS
+#error "TIVA_MAC_PHY_TIMEOUT requires the realtime counter service"
+#endif
+
+/*===========================================================================*/
+/* Driver data structures and types.                                         */
+/*===========================================================================*/
+
+/**
+ * @brief   Type of an Tiva Ethernet receive descriptor.
+ */
+typedef struct
+{
+  volatile uint32_t     rdes0;
+  volatile uint32_t     rdes1;
+  volatile uint32_t     rdes2;
+  volatile uint32_t     rdes3;
+} tiva_eth_rx_descriptor_t;
+
+/**
+ * @brief   Type of an Tiva Ethernet transmit descriptor.
+ */
+typedef struct
+{
+  volatile uint32_t     tdes0;
+  volatile uint32_t     tdes1;
+  volatile uint32_t     tdes2;
+  volatile uint32_t     tdes3;
+  volatile uint32_t     locked;
+} tiva_eth_tx_descriptor_t;
+
+/**
+ * @brief   Driver configuration structure.
+ */
+typedef struct
+{
+  /**
+   * @brief MAC address.
+   */
+  uint8_t               *mac_address;
+  /* End of the mandatory fields.*/
+} MACConfig;
+
+/**
+ * @brief   Structure representing a MAC driver.
+ */
+struct MACDriver
+{
+  /**
+   * @brief Driver state.
+   */
+  macstate_t            state;
+  /**
+   * @brief Current configuration data.
+   */
+  const MACConfig       *config;
+  /**
+   * @brief Transmit semaphore.
+   */
+  threads_queue_t       tdqueue;
+  /**
+   * @brief Receive semaphore.
+   */
+  threads_queue_t       rdqueue;
+#if MAC_USE_EVENTS || defined(__DOXYGEN__)
+  /**
+   * @brief Receive event.
+   */
+  event_source_t        rdevent;
+#endif
+  /* End of the mandatory fields.*/
+  /**
+   * @brief Link status flag.
+   */
+  bool                  link_up;
+  /**
+   * @brief PHY address (pre shifted).
+   */
+  uint32_t              phyaddr;
+  /**
+   * @brief Receive next frame pointer.
+   */
+  tiva_eth_rx_descriptor_t *rxptr;
+  /**
+   * @brief Transmit next frame pointer.
+   */
+  tiva_eth_tx_descriptor_t *txptr;
+};
+
+/**
+ * @brief   Structure representing a transmit descriptor.
+ */
+typedef struct
+{
+  /**
+   * @brief Current write offset.
+   */
+  size_t                    offset;
+  /**
+   * @brief Available space size.
+   */
+  size_t                    size;
+  /* End of the mandatory fields.*/
+  /**
+   * @brief Pointer to the physical descriptor.
+   */
+  tiva_eth_tx_descriptor_t *physdesc;
+} MACTransmitDescriptor;
+
+/**
+ * @brief   Structure representing a receive descriptor.
+ */
+typedef struct
+{
+  /**
+   * @brief Current read offset.
+   */
+  size_t                offset;
+  /**
+   * @brief Available data size.
+   */
+  size_t                size;
+  /* End of the mandatory fields.*/
+  /**
+   * @brief Pointer to the physical descriptor.
+   */
+  tiva_eth_rx_descriptor_t *physdesc;
+} MACReceiveDescriptor;
+
+/*===========================================================================*/
+/* Driver macros.                                                            */
+/*===========================================================================*/
+
+/*===========================================================================*/
+/* External declarations.                                                    */
+/*===========================================================================*/
+
+extern MACDriver ETHD1;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+  void mac_lld_init(void);
+  void mac_lld_start(MACDriver *macp);
+  void mac_lld_stop(MACDriver *macp);
+  msg_t mac_lld_get_transmit_descriptor(MACDriver *macp,
+                                        MACTransmitDescriptor *tdp);
+  void mac_lld_release_transmit_descriptor(MACTransmitDescriptor *tdp);
+  msg_t mac_lld_get_receive_descriptor(MACDriver *macp,
+                                       MACReceiveDescriptor *rdp);
+  void mac_lld_release_receive_descriptor(MACReceiveDescriptor *rdp);
+  bool mac_lld_poll_link_status(MACDriver *macp);
+  size_t mac_lld_write_transmit_descriptor(MACTransmitDescriptor *tdp,
+                                           uint8_t *buf,
+                                           size_t size);
+  size_t mac_lld_read_receive_descriptor(MACReceiveDescriptor *rdp,
+                                         uint8_t *buf,
+                                         size_t size);
+#if MAC_USE_ZERO_COPY
+  uint8_t *mac_lld_get_next_transmit_buffer(MACTransmitDescriptor *tdp,
+                                            size_t size,
+                                            size_t *sizep);
+  const uint8_t *mac_lld_get_next_receive_buffer(MACReceiveDescriptor *rdp,
+                                                 size_t *sizep);
+#endif /* MAC_USE_ZERO_COPY */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* HAL_USE_MAC */
+
+#endif /* _MAC_LLD_H_ */
+
+/** @} */
diff --git a/os/hal/ports/TIVA/TM4C129x/platform.mk b/os/hal/ports/TIVA/TM4C129x/platform.mk
index 83331e0..35de5ce 100644
--- a/os/hal/ports/TIVA/TM4C129x/platform.mk
+++ b/os/hal/ports/TIVA/TM4C129x/platform.mk
@@ -3,7 +3,8 @@ PLATFORMSRC = ${CHIBIOS}/os/hal/ports/common/ARMCMx/nvic.c \
               ${CHIBIOS}/community/os/hal/ports/TIVA/TM4C129x/hal_lld.c \
               ${CHIBIOS}/community/os/hal/ports/TIVA/LLD/st_lld.c \
               ${CHIBIOS}/community/os/hal/ports/TIVA/LLD/pal_lld.c \
-              ${CHIBIOS}/community/os/hal/ports/TIVA/LLD/serial_lld.c
+              ${CHIBIOS}/community/os/hal/ports/TIVA/LLD/serial_lld.c \
+              ${CHIBIOS}/community/os/hal/ports/TIVA/LLD/mac_lld.c
 
 # Required include directories
 PLATFORMINC = ${CHIBIOS}/os/hal/ports/common/ARMCMx \