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    Subject[PATCH 1/3] Blackfin ethernet driver: on chip ethernet MAC controller driver
    From
    Date
    This patch implements the driver necessary use the Analog Devices
    Blackfin processor's on-chip ethernet MAC controller.

    - clean up coding style issues by Jeff's review

    Signed-off-by: Bryan Wu <bryan.wu@analog.com>
    Cc: Jeff Garzik <jeff@garzik.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---
    MAINTAINERS | 7 +
    drivers/net/Kconfig | 44 ++
    drivers/net/Makefile | 1 +
    drivers/net/bfin_mac.c | 1034 ++++++++++++++++++++++++++++++++++++++++++++++++
    drivers/net/bfin_mac.h | 144 +++++++
    5 files changed, 1230 insertions(+), 0 deletions(-)
    create mode 100644 drivers/net/bfin_mac.c
    create mode 100644 drivers/net/bfin_mac.h

    diff --git a/MAINTAINERS b/MAINTAINERS
    index 845fbf4..21a2265 100644
    --- a/MAINTAINERS
    +++ b/MAINTAINERS
    @@ -754,6 +754,13 @@ L: uclinux-dist-devel@blackfin.uclinux.org (subscribers-only)
    W: http://blackfin.uclinux.org
    S: Supported

    +BLACKFIN EMAC DRIVER
    +P: Bryan Wu
    +M: bryan.wu@analog.com
    +L: uclinux-dist-devel@blackfin.uclinux.org (subscribers-only)
    +W: http://blackfin.uclinux.org
    +S: Supported
    +
    BLACKFIN RTC DRIVER
    P: Mike Frysinger
    M: michael.frysinger@analog.com
    diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
    index ba314ad..9356a6e 100644
    --- a/drivers/net/Kconfig
    +++ b/drivers/net/Kconfig
    @@ -838,6 +838,50 @@ config ULTRA32
    <file:Documentation/networking/net-modules.txt>. The module
    will be called smc-ultra32.

    +config BFIN_MAC
    + tristate "Blackfin 536/537 on-chip mac support"
    + depends on NET_ETHERNET && (BF537 || BF536) && (!BF537_PORT_H)
    + select CRC32
    + select BFIN_MAC_USE_L1 if DMA_UNCACHED_NONE
    + help
    + This is the driver for blackfin on-chip mac device. Say Y if you want it
    + compiled into the kernel. This driver is also available as a module
    + ( = code which can be inserted in and removed from the running kernel
    + whenever you want). The module will be called bfin_mac.
    +
    +config BFIN_MAC_USE_L1
    + bool "Use L1 memory for rx/tx packets"
    + depends on BFIN_MAC && BF537
    + default y
    + help
    + To get maximum network performace, you should use L1 memory as rx/tx buffers.
    + Say N here if you want to reserve L1 memory for other uses.
    +
    +config BFIN_TX_DESC_NUM
    + int "Number of transmit buffer packets"
    + depends on BFIN_MAC
    + range 6 10 if BFIN_MAC_USE_L1
    + range 10 100
    + default "10"
    + help
    + Set the number of buffer packets used in driver.
    +
    +config BFIN_RX_DESC_NUM
    + int "Number of receive buffer packets"
    + depends on BFIN_MAC
    + range 20 100 if BFIN_MAC_USE_L1
    + range 20 800
    + default "20"
    + help
    + Set the number of buffer packets used in driver.
    +
    +config BFIN_MAC_RMII
    + bool "RMII PHY Interface (EXPERIMENTAL)"
    + depends on BFIN_MAC && EXPERIMENTAL
    + default n
    + help
    + Use Reduced PHY MII Interface
    +
    config SMC9194
    tristate "SMC 9194 support"
    depends on NET_VENDOR_SMC && (ISA || MAC && BROKEN)
    diff --git a/drivers/net/Makefile b/drivers/net/Makefile
    index a2241e6..c23a1b3 100644
    --- a/drivers/net/Makefile
    +++ b/drivers/net/Makefile
    @@ -198,6 +198,7 @@ obj-$(CONFIG_S2IO) += s2io.o
    obj-$(CONFIG_MYRI10GE) += myri10ge/
    obj-$(CONFIG_SMC91X) += smc91x.o
    obj-$(CONFIG_SMC911X) += smc911x.o
    +obj-$(CONFIG_BFIN_MAC) += bfin_mac.o
    obj-$(CONFIG_DM9000) += dm9000.o
    obj-$(CONFIG_FEC_8XX) += fec_8xx/
    obj-$(CONFIG_PASEMI_MAC) += pasemi_mac.o
    diff --git a/drivers/net/bfin_mac.c b/drivers/net/bfin_mac.c
    new file mode 100644
    index 0000000..72c524f
    --- /dev/null
    +++ b/drivers/net/bfin_mac.c
    @@ -0,0 +1,1034 @@
    +/*
    + * File: drivers/net/bfin_mac.c
    + * Based on:
    + * Maintainer:
    + * Bryan Wu <bryan.wu@analog.com>
    + *
    + * Original author:
    + * Luke Yang <luke.yang@analog.com>
    + *
    + * Created:
    + * Description:
    + *
    + * Modified:
    + * Copyright 2004-2006 Analog Devices Inc.
    + *
    + * Bugs: Enter bugs at http://blackfin.uclinux.org/
    + *
    + * This program is free software ; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation ; either version 2, or (at your option)
    + * any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY ; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program ; see the file COPYING.
    + * If not, write to the Free Software Foundation,
    + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    + */
    +
    +#include <linux/init.h>
    +#include <linux/module.h>
    +#include <linux/kernel.h>
    +#include <linux/sched.h>
    +#include <linux/slab.h>
    +#include <linux/delay.h>
    +#include <linux/timer.h>
    +#include <linux/errno.h>
    +#include <linux/irq.h>
    +#include <linux/io.h>
    +#include <linux/ioport.h>
    +#include <linux/crc32.h>
    +#include <linux/device.h>
    +#include <linux/spinlock.h>
    +#include <linux/ethtool.h>
    +#include <linux/mii.h>
    +
    +#include <linux/netdevice.h>
    +#include <linux/etherdevice.h>
    +#include <linux/skbuff.h>
    +
    +#include <linux/platform_device.h>
    +#include <linux/netdevice.h>
    +#include <linux/etherdevice.h>
    +#include <linux/skbuff.h>
    +
    +#include <asm/dma.h>
    +#include <linux/dma-mapping.h>
    +
    +#include <asm/blackfin.h>
    +#include <asm/cacheflush.h>
    +
    +#include "bfin_mac.h"
    +
    +#undef DRV_DEBUG
    +
    +#define CARDNAME "bfin_mac"
    +
    +MODULE_LICENSE("GPL");
    +MODULE_AUTHOR("Bryan Wu, Luke Yang");
    +MODULE_DESCRIPTION("Blackfin MAC Driver");
    +
    +#if defined(CONFIG_BFIN_MAC_USE_L1)
    +# define bfin_mac_alloc(dma_handle, size) l1_data_sram_zalloc(size)
    +# define bfin_mac_free(dma_handle, ptr) l1_data_sram_free(ptr)
    +#else
    +# define bfin_mac_alloc(dma_handle, size) \
    + dma_alloc_coherent(NULL, size, dma_handle, GFP_DMA)
    +# define bfin_mac_free(dma_handle, ptr) \
    + dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
    +#endif
    +
    +#define PKT_BUF_SZ 1580
    +
    +static void desc_list_free(void);
    +
    +/* pointers to maintain transmit list */
    +static struct net_dma_desc_tx *tx_list_head;
    +static struct net_dma_desc_tx *tx_list_tail;
    +static struct net_dma_desc_rx *rx_list_head;
    +static struct net_dma_desc_rx *rx_list_tail;
    +static struct net_dma_desc_rx *current_rx_ptr;
    +static struct net_dma_desc_tx *current_tx_ptr;
    +static struct net_dma_desc_tx *tx_desc;
    +static struct net_dma_desc_rx *rx_desc;
    +
    +static int desc_list_init(void)
    +{
    + struct net_dma_desc_tx *tmp_desc_tx;
    + struct net_dma_desc_rx *tmp_desc_rx;
    + int i;
    + struct sk_buff *new_skb;
    +#if !defined(CONFIG_BFIN_MAC_USE_L1)
    + dma_addr_t dma_handle;
    +#endif
    +
    + tx_desc =
    + bfin_mac_alloc(&dma_handle,
    + sizeof(struct net_dma_desc_tx) *
    + CONFIG_BFIN_TX_DESC_NUM);
    + if (tx_desc == NULL)
    + goto init_error;
    +
    + rx_desc =
    + bfin_mac_alloc(&dma_handle,
    + sizeof(struct net_dma_desc_rx) *
    + CONFIG_BFIN_RX_DESC_NUM);
    + if (rx_desc == NULL)
    + goto init_error;
    +
    + /* init tx_list */
    + for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
    +
    + tmp_desc_tx = tx_desc + i;
    +
    + if (i == 0) {
    + tx_list_head = tmp_desc_tx;
    + tx_list_tail = tmp_desc_tx;
    + }
    +
    + tmp_desc_tx->desc_a.start_addr =
    + (unsigned long)tmp_desc_tx->packet;
    + tmp_desc_tx->desc_a.x_count = 0;
    + /* disabled */
    + tmp_desc_tx->desc_a.config.b_DMA_EN = 0;
    + /* read from memory */
    + tmp_desc_tx->desc_a.config.b_WNR = 0;
    + /* wordsize is 32 bits */
    + tmp_desc_tx->desc_a.config.b_WDSIZE = 2;
    + /* 6 half words is desc size. */
    + tmp_desc_tx->desc_a.config.b_NDSIZE = 6;
    + /* large desc flow */
    + tmp_desc_tx->desc_a.config.b_FLOW = 7;
    + tmp_desc_tx->desc_a.next_dma_desc = &(tmp_desc_tx->desc_b);
    +
    + tmp_desc_tx->desc_b.start_addr =
    + (unsigned long)(&(tmp_desc_tx->status));
    + tmp_desc_tx->desc_b.x_count = 0;
    + /* enabled */
    + tmp_desc_tx->desc_b.config.b_DMA_EN = 1;
    + /* write to memory */
    + tmp_desc_tx->desc_b.config.b_WNR = 1;
    + /* wordsize is 32 bits */
    + tmp_desc_tx->desc_b.config.b_WDSIZE = 2;
    + /* disable interrupt */
    + tmp_desc_tx->desc_b.config.b_DI_EN = 0;
    + tmp_desc_tx->desc_b.config.b_NDSIZE = 6;
    + /* stop mode */
    + tmp_desc_tx->desc_b.config.b_FLOW = 7;
    + tmp_desc_tx->skb = NULL;
    + tx_list_tail->desc_b.next_dma_desc = &(tmp_desc_tx->desc_a);
    + tx_list_tail->next = tmp_desc_tx;
    +
    + tx_list_tail = tmp_desc_tx;
    + }
    + tx_list_tail->next = tx_list_head; /* tx_list is a circle */
    + tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
    + current_tx_ptr = tx_list_head;
    +
    + /* init rx_list */
    + for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
    +
    + tmp_desc_rx = rx_desc + i;
    +
    + if (i == 0) {
    + rx_list_head = tmp_desc_rx;
    + rx_list_tail = tmp_desc_rx;
    + }
    +
    + /* allocat a new skb for next time receive */
    + new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
    + if (!new_skb) {
    + printk(KERN_NOTICE CARDNAME
    + ": init: low on mem - packet dropped\n");
    + goto init_error;
    + }
    + skb_reserve(new_skb, 2);
    + tmp_desc_rx->skb = new_skb;
    + /* since RXDWA is enabled */
    + tmp_desc_rx->desc_a.start_addr =
    + (unsigned long)new_skb->data - 2;
    + tmp_desc_rx->desc_a.x_count = 0;
    + /* enabled */
    + tmp_desc_rx->desc_a.config.b_DMA_EN = 1;
    + /* Write to memory */
    + tmp_desc_rx->desc_a.config.b_WNR = 1;
    + /* wordsize is 32 bits */
    + tmp_desc_rx->desc_a.config.b_WDSIZE = 2;
    + /* 6 half words is desc size. */
    + tmp_desc_rx->desc_a.config.b_NDSIZE = 6;
    + /* large desc flow */
    + tmp_desc_rx->desc_a.config.b_FLOW = 7;
    + tmp_desc_rx->desc_a.next_dma_desc = &(tmp_desc_rx->desc_b);
    +
    + tmp_desc_rx->desc_b.start_addr =
    + (unsigned long)(&(tmp_desc_rx->status));
    + tmp_desc_rx->desc_b.x_count = 0;
    + /* enabled */
    + tmp_desc_rx->desc_b.config.b_DMA_EN = 1;
    + /* Write to memory */
    + tmp_desc_rx->desc_b.config.b_WNR = 1;
    + /* wordsize is 32 bits */
    + tmp_desc_rx->desc_b.config.b_WDSIZE = 2;
    + tmp_desc_rx->desc_b.config.b_NDSIZE = 6;
    + /* enable interrupt */
    + tmp_desc_rx->desc_b.config.b_DI_EN = 1;
    + /* large mode */
    + tmp_desc_rx->desc_b.config.b_FLOW = 7;
    + rx_list_tail->desc_b.next_dma_desc = &(tmp_desc_rx->desc_a);
    +
    + rx_list_tail->next = tmp_desc_rx;
    + rx_list_tail = tmp_desc_rx;
    + }
    + rx_list_tail->next = rx_list_head; /* rx_list is a circle */
    + rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
    + current_rx_ptr = rx_list_head;
    +
    + return 0;
    +
    +init_error:
    + desc_list_free();
    + printk(KERN_ERR CARDNAME ": kmalloc failed\n");
    + return -ENOMEM;
    +}
    +
    +static void desc_list_free(void)
    +{
    + struct net_dma_desc_rx *tmp_desc_rx;
    + struct net_dma_desc_tx *tmp_desc_tx;
    + int i;
    +#if !defined(CONFIG_BFIN_MAC_USE_L1)
    + dma_addr_t dma_handle = 0;
    +#endif
    +
    + if (tx_desc != NULL) {
    + tmp_desc_tx = tx_list_head;
    + for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
    + if (tmp_desc_tx != NULL) {
    + if (tmp_desc_tx->skb) {
    + dev_kfree_skb(tmp_desc_tx->skb);
    + tmp_desc_tx->skb = NULL;
    + }
    +
    + }
    + tmp_desc_tx = tmp_desc_tx->next;
    + }
    + bfin_mac_free(dma_handle, tx_desc);
    + }
    +
    + if (rx_desc != NULL) {
    + tmp_desc_rx = rx_list_head;
    + for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
    + if (tmp_desc_rx != NULL) {
    + if (tmp_desc_rx->skb) {
    + dev_kfree_skb(tmp_desc_rx->skb);
    + tmp_desc_rx->skb = NULL;
    + }
    + }
    + tmp_desc_rx = tmp_desc_rx->next;
    + }
    + bfin_mac_free(dma_handle, rx_desc);
    + }
    +}
    +
    +/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
    +
    +/* Set FER regs to MUX in Ethernet pins */
    +static void setup_pin_mux(void)
    +{
    + unsigned int fer_val;
    +
    + /*
    + * FER reg bug work-around
    + * read it once
    + */
    + fer_val = bfin_read_PORTH_FER();
    +
    +#if defined(CONFIG_BFIN_MAC_RMII)
    + fer_val = 0xC373;
    +#else
    + fer_val = 0xffff;
    +#endif
    + /* write it twice to the same value */
    +
    + bfin_write_PORTH_FER(fer_val);
    + bfin_write_PORTH_FER(fer_val);
    +}
    +
    +/* Wait until the previous MDC/MDIO transaction has completed */
    +static void poll_mdc_done(void)
    +{
    + /* poll the STABUSY bit */
    + while ((bfin_read_EMAC_STAADD()) & STABUSY) {
    + };
    +}
    +
    +/* Read an off-chip register in a PHY through the MDC/MDIO port */
    +static u16 read_phy_reg(u16 PHYAddr, u16 RegAddr)
    +{
    + poll_mdc_done();
    + /* read mode */
    + bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) |
    + SET_REGAD(RegAddr) |
    + STABUSY);
    + poll_mdc_done();
    +
    + return (u16) bfin_read_EMAC_STADAT();
    +}
    +
    +/* Write an off-chip register in a PHY through the MDC/MDIO port */
    +static void raw_write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data)
    +{
    + bfin_write_EMAC_STADAT(Data);
    +
    + /* write mode */
    + bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) |
    + SET_REGAD(RegAddr) |
    + STAOP |
    + STABUSY);
    +
    + poll_mdc_done();
    +}
    +
    +static void write_phy_reg(u16 PHYAddr, u16 RegAddr, u32 Data)
    +{
    + poll_mdc_done();
    + raw_write_phy_reg(PHYAddr, RegAddr, Data);
    +}
    +
    +/* set up the phy */
    +static void bf537mac_setphy(struct net_device *dev)
    +{
    + u16 phydat;
    + u32 sysctl;
    + struct bf537mac_local *lp = netdev_priv(dev);
    +
    + pr_debug("start settting up phy\n");
    +
    + /* Program PHY registers */
    + phydat = 0;
    +
    + /* issue a reset */
    + raw_write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, 0x8000);
    +
    + /* wait half a second */
    + udelay(500);
    +
    + phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
    +
    + /* advertise flow control supported */
    + phydat = read_phy_reg(lp->PhyAddr, PHYREG_ANAR);
    + phydat |= (1 << 10);
    + write_phy_reg(lp->PhyAddr, PHYREG_ANAR, phydat);
    +
    + phydat = 0;
    + if (lp->Negotiate) {
    + phydat |= 0x1000; /* enable auto negotiation */
    + } else {
    + if (lp->FullDuplex) {
    + phydat |= (1 << 8); /* full duplex */
    + } else {
    + phydat &= (~(1 << 8)); /* half duplex */
    + }
    + if (!lp->Port10) {
    + phydat |= (1 << 13); /* 100 Mbps */
    + } else {
    + phydat &= (~(1 << 13)); /* 10 Mbps */
    + }
    + }
    +
    + if (lp->Loopback) {
    + phydat |= (1 << 14); /* enable TX->RX loopback */
    +#ifdef DRV_DEBUG
    + write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
    +#endif
    + }
    +
    + write_phy_reg(lp->PhyAddr, PHYREG_MODECTL, phydat);
    + udelay(500);
    +
    + phydat = read_phy_reg(lp->PhyAddr, PHYREG_MODECTL);
    + /* check for SMSC PHY */
    + if ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID1) == 0x7) &&
    + ((read_phy_reg(lp->PhyAddr, PHYREG_PHYID2) & 0xfff0) == 0xC0A0)) {
    + /*
    + * we have SMSC PHY so reqest interrupt
    + * on link down condition
    + */
    +
    + /* enable interrupts */
    + write_phy_reg(lp->PhyAddr, 30, 0x0ff);
    + /* enable PHY_INT */
    + sysctl = bfin_read_EMAC_SYSCTL();
    + sysctl |= 0x1;
    +#ifdef DRV_DEBUG
    + bfin_write_EMAC_SYSCTL(sysctl);
    +#endif
    + }
    +}
    +
    +/**************************************************************************/
    +void setup_system_regs(struct net_device *dev)
    +{
    + int PHYADDR;
    + unsigned short sysctl, phydat;
    + u32 opmode;
    + struct bf537mac_local *lp = netdev_priv(dev);
    + int count = 0;
    +
    + PHYADDR = lp->PhyAddr;
    +
    + /* Enable PHY output */
    + if (!(bfin_read_VR_CTL() & PHYCLKOE))
    + bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
    +
    + /* MDC = 2.5 MHz */
    + sysctl = SET_MDCDIV(24);
    + /* Odd word alignment for Receive Frame DMA word */
    + /* Configure checksum support and rcve frame word alignment */
    +#if defined(BFIN_MAC_CSUM_OFFLOAD)
    + sysctl |= RXDWA | RXCKS;
    +#else
    + sysctl |= RXDWA;
    +#endif
    + bfin_write_EMAC_SYSCTL(sysctl);
    + /* auto negotiation on */
    + /* full duplex */
    + /* 100 Mbps */
    + phydat = PHY_ANEG_EN | PHY_DUPLEX | PHY_SPD_SET;
    + write_phy_reg(PHYADDR, PHYREG_MODECTL, phydat);
    +
    + /* test if full duplex supported */
    + do {
    + msleep(100);
    + phydat = read_phy_reg(PHYADDR, PHYREG_MODESTAT);
    + if (count > 30) {
    + printk(KERN_NOTICE CARDNAME ": Link is down\n");
    + printk(KERN_NOTICE CARDNAME
    + "please check your network connection\n");
    + break;
    + }
    + count++;
    + } while (!(phydat & 0x0004));
    +
    + phydat = read_phy_reg(PHYADDR, PHYREG_ANLPAR);
    +
    + if ((phydat & 0x0100) || (phydat & 0x0040)) {
    + opmode = FDMODE;
    + } else {
    + opmode = 0;
    + printk(KERN_INFO CARDNAME
    + ": Network is set to half duplex\n");
    + }
    +
    +#if defined(CONFIG_BFIN_MAC_RMII)
    + opmode |= RMII; /* For Now only 100MBit are supported */
    +#endif
    +
    + bfin_write_EMAC_OPMODE(opmode);
    +
    +#ifdef DRV_DEBUG
    + bfin_write_EMAC_MMC_CTL(RSTC | CROLL | MMCE);
    +#endif
    + bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
    +
    + /* Initialize the TX DMA channel registers */
    + bfin_write_DMA2_X_COUNT(0);
    + bfin_write_DMA2_X_MODIFY(4);
    + bfin_write_DMA2_Y_COUNT(0);
    + bfin_write_DMA2_Y_MODIFY(0);
    +
    + /* Initialize the RX DMA channel registers */
    + bfin_write_DMA1_X_COUNT(0);
    + bfin_write_DMA1_X_MODIFY(4);
    + bfin_write_DMA1_Y_COUNT(0);
    + bfin_write_DMA1_Y_MODIFY(0);
    +}
    +
    +void setup_mac_addr(u8 * mac_addr)
    +{
    + /* this depends on a little-endian machine */
    + bfin_write_EMAC_ADDRLO(*(u32 *) & mac_addr[0]);
    + bfin_write_EMAC_ADDRHI(*(u16 *) & mac_addr[4]);
    +}
    +
    +static void adjust_tx_list(void)
    +{
    + if (tx_list_head->status.status_word != 0
    + && current_tx_ptr != tx_list_head) {
    + goto adjust_head; /* released something, just return; */
    + }
    +
    + /*
    + * if nothing released, check wait condition
    + * current's next can not be the head,
    + * otherwise the dma will not stop as we want
    + */
    + if (current_tx_ptr->next->next == tx_list_head) {
    + while (tx_list_head->status.status_word == 0) {
    + udelay(10);
    + if (tx_list_head->status.status_word != 0
    + || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
    + goto adjust_head;
    + }
    + }
    + if (tx_list_head->status.status_word != 0) {
    + goto adjust_head;
    + }
    + }
    +
    + return;
    +
    +adjust_head:
    + do {
    + tx_list_head->desc_a.config.b_DMA_EN = 0;
    + tx_list_head->status.status_word = 0;
    + if (tx_list_head->skb) {
    + dev_kfree_skb(tx_list_head->skb);
    + tx_list_head->skb = NULL;
    + } else {
    + printk(KERN_ERR CARDNAME
    + ": no sk_buff in a transmitted frame!\n");
    + }
    + tx_list_head = tx_list_head->next;
    + } while (tx_list_head->status.status_word != 0
    + && current_tx_ptr != tx_list_head);
    + return;
    +
    +}
    +
    +static int bf537mac_hard_start_xmit(struct sk_buff *skb,
    + struct net_device *dev)
    +{
    + struct bf537mac_local *lp = netdev_priv(dev);
    + unsigned int data;
    +
    + current_tx_ptr->skb = skb;
    +
    + /*
    + * Is skb->data always 16-bit aligned?
    + * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
    + */
    + if ((((unsigned int)(skb->data)) & 0x02) == 2) {
    + /* move skb->data to current_tx_ptr payload */
    + data = (unsigned int)(skb->data) - 2;
    + *((unsigned short *)data) = (unsigned short)(skb->len);
    + current_tx_ptr->desc_a.start_addr = (unsigned long)data;
    + /* this is important! */
    + blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
    +
    + } else {
    + *((unsigned short *)(current_tx_ptr->packet)) =
    + (unsigned short)(skb->len);
    + memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
    + (skb->len));
    + current_tx_ptr->desc_a.start_addr =
    + (unsigned long)current_tx_ptr->packet;
    + if (current_tx_ptr->status.status_word != 0)
    + current_tx_ptr->status.status_word = 0;
    + blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
    + packet,
    + (unsigned int)(current_tx_ptr->
    + packet + skb->len) +
    + 2);
    + }
    +
    + /* enable this packet's dma */
    + current_tx_ptr->desc_a.config.b_DMA_EN = 1;
    +
    + if (bfin_read_DMA2_IRQ_STATUS() & 0x08) {
    + /* tx dma is running, just return */
    + goto out;
    + } else {
    + /* tx dma is not running */
    + bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
    + /* dma enabled, read from memory, size is 6 */
    + bfin_write_DMA2_CONFIG(*((unsigned short *)
    + (&(current_tx_ptr->desc_a.config))));
    + /* Turn on the EMAC tx */
    + bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
    + }
    +
    +out:
    + adjust_tx_list();
    + current_tx_ptr = current_tx_ptr->next;
    + dev->trans_start = jiffies;
    + lp->stats.tx_packets++;
    + lp->stats.tx_bytes += (skb->len);
    + return 0;
    +}
    +
    +static void bf537mac_rx(struct net_device *dev)
    +{
    + struct sk_buff *skb, *new_skb;
    + struct bf537mac_local *lp = netdev_priv(dev);
    + unsigned short len;
    +
    + /* allocat a new skb for next time receive */
    + skb = current_rx_ptr->skb;
    + new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
    + if (!new_skb) {
    + printk(KERN_NOTICE CARDNAME
    + ": rx: low on mem - packet dropped\n");
    + lp->stats.rx_dropped++;
    + goto out;
    + }
    + /* reserve 2 bytes for RXDWA padding */
    + skb_reserve(new_skb, 2);
    + current_rx_ptr->skb = new_skb;
    + current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
    +
    +#ifdef DRV_DEBUG
    + int i;
    + if (len >= 64) {
    + for (i = 0; i < len; i++) {
    + printk(KERN_DEBUG "%.2x-", ((unsigned char *)pkt)[i]);
    + if (((i % 8) == 0) && (i != 0))
    + printk(KERN_DEBUG "\n");
    + }
    + printk(KERN_DEBUG"\n");
    + }
    +#endif
    +
    + len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
    + skb_put(skb, len);
    + blackfin_dcache_invalidate_range((unsigned long)skb->head,
    + (unsigned long)skb->tail);
    +
    + dev->last_rx = jiffies;
    + skb->dev = dev;
    + skb->protocol = eth_type_trans(skb, dev);
    +#if defined(BFIN_MAC_CSUM_OFFLOAD)
    + skb->csum = current_rx_ptr->status.ip_payload_csum;
    + skb->ip_summed = CHECKSUM_PARTIAL;
    +#endif
    +
    + netif_rx(skb);
    + lp->stats.rx_packets++;
    + lp->stats.rx_bytes += len;
    + current_rx_ptr->status.status_word = 0x00000000;
    + current_rx_ptr = current_rx_ptr->next;
    +
    +out:
    + return;
    +}
    +
    +/* interrupt routine to handle rx and error signal */
    +static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
    +{
    + struct net_device *dev = dev_id;
    + int number = 0;
    +
    +get_one_packet:
    + if (current_rx_ptr->status.status_word == 0) {
    + /* no more new packet received */
    + if (number == 0) {
    + if (current_rx_ptr->next->status.status_word != 0) {
    + current_rx_ptr = current_rx_ptr->next;
    + goto real_rx;
    + }
    + }
    + bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
    + DMA_DONE | DMA_ERR);
    + return IRQ_HANDLED;
    + }
    +
    +real_rx:
    + bf537mac_rx(dev);
    + number++;
    + goto get_one_packet;
    +}
    +
    +#ifdef CONFIG_NET_POLL_CONTROLLER
    +static void bf537mac_poll(struct net_device *dev)
    +{
    + disable_irq(IRQ_MAC_RX);
    + bf537mac_interrupt(IRQ_MAC_RX, dev);
    + enable_irq(IRQ_MAC_RX);
    +}
    +#endif /* CONFIG_NET_POLL_CONTROLLER */
    +
    +static void bf537mac_reset(void)
    +{
    + unsigned int opmode;
    +
    + opmode = bfin_read_EMAC_OPMODE();
    + opmode &= (~RE);
    + opmode &= (~TE);
    + /* Turn off the EMAC */
    + bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() & opmode);
    +}
    +
    +/*
    + * Enable Interrupts, Receive, and Transmit
    + */
    +static int bf537mac_enable(struct net_device *dev)
    +{
    + u32 opmode;
    +
    + pr_debug("%s: %s\n", dev->name, __FUNCTION__);
    +
    + /* Set RX DMA */
    + bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
    + bfin_write_DMA1_CONFIG( *((unsigned short *)
    + (&(rx_list_head->desc_a.config))));
    +
    + /* Wait MII done */
    + poll_mdc_done();
    +
    + /* We enable only RX here */
    + /* ASTP : Enable Automatic Pad Stripping
    + PR : Promiscuous Mode for test
    + PSF : Receive frames with total length less than 64 bytes.
    + FDMODE : Full Duplex Mode
    + LB : Internal Loopback for test
    + RE : Receiver Enable */
    + opmode = bfin_read_EMAC_OPMODE();
    + if (opmode & FDMODE)
    + opmode |= PSF;
    + else
    + opmode |= DRO | DC | PSF;
    + opmode |= RE;
    +
    +#if defined(CONFIG_BFIN_MAC_RMII)
    + opmode |= RMII; /* For Now only 100MBit are supported */
    +#ifdef CONFIG_BF_REV_0_2
    + opmode |= TE;
    +#endif
    +#endif
    + /* Turn on the EMAC rx */
    + bfin_write_EMAC_OPMODE(opmode);
    +
    + return 0;
    +}
    +
    +/* Our watchdog timed out. Called by the networking layer */
    +static void bf537mac_timeout(struct net_device *dev)
    +{
    + pr_debug("%s: %s\n", dev->name, __FUNCTION__);
    +
    + bf537mac_reset();
    +
    + /* reset tx queue */
    + tx_list_tail = tx_list_head->next;
    +
    + bf537mac_enable(dev);
    +
    + /* We can accept TX packets again */
    + dev->trans_start = jiffies;
    + netif_wake_queue(dev);
    +}
    +
    +/*
    + * Get the current statistics.
    + * This may be called with the card open or closed.
    + */
    +static struct net_device_stats *bf537mac_query_statistics(struct net_device
    + *dev)
    +{
    + struct bf537mac_local *lp = netdev_priv(dev);
    +
    + pr_debug("%s: %s\n", dev->name, __FUNCTION__);
    +
    + return &lp->stats;
    +}
    +
    +/*
    + * This routine will, depending on the values passed to it,
    + * either make it accept multicast packets, go into
    + * promiscuous mode (for TCPDUMP and cousins) or accept
    + * a select set of multicast packets
    + */
    +static void bf537mac_set_multicast_list(struct net_device *dev)
    +{
    + u32 sysctl;
    +
    + if (dev->flags & IFF_PROMISC) {
    + printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
    + sysctl = bfin_read_EMAC_OPMODE();
    + sysctl |= RAF;
    + bfin_write_EMAC_OPMODE(sysctl);
    + } else if (dev->flags & IFF_ALLMULTI || dev->mc_count > 16) {
    + /* accept all multicast */
    + sysctl = bfin_read_EMAC_OPMODE();
    + sysctl |= PAM;
    + bfin_write_EMAC_OPMODE(sysctl);
    + } else if (dev->mc_count) {
    + /* set multicast */
    + } else {
    + /* clear promisc or multicast mode */
    + sysctl = bfin_read_EMAC_OPMODE();
    + sysctl &= ~(RAF | PAM);
    + bfin_write_EMAC_OPMODE(sysctl);
    + }
    +}
    +
    +/*
    + * this puts the device in an inactive state
    + */
    +static void bf537mac_shutdown(struct net_device *dev)
    +{
    + /* Turn off the EMAC */
    + bfin_write_EMAC_OPMODE(0x00000000);
    + /* Turn off the EMAC RX DMA */
    + bfin_write_DMA1_CONFIG(0x0000);
    + bfin_write_DMA2_CONFIG(0x0000);
    +}
    +
    +/*
    + * Open and Initialize the interface
    + *
    + * Set up everything, reset the card, etc..
    + */
    +static int bf537mac_open(struct net_device *dev)
    +{
    + pr_debug("%s: %s\n", dev->name, __FUNCTION__);
    +
    + /*
    + * Check that the address is valid. If its not, refuse
    + * to bring the device up. The user must specify an
    + * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
    + */
    + if (!is_valid_ether_addr(dev->dev_addr)) {
    + printk(KERN_WARNING CARDNAME ": no valid ethernet hw addr\n");
    + return -EINVAL;
    + }
    +
    + /* initial rx and tx list */
    + desc_list_init();
    +
    + bf537mac_setphy(dev);
    + setup_system_regs(dev);
    + bf537mac_reset();
    + bf537mac_enable(dev);
    +
    + pr_debug("hardware init finished\n");
    + netif_start_queue(dev);
    + netif_carrier_on(dev);
    +
    + return 0;
    +}
    +
    +/*
    + *
    + * this makes the board clean up everything that it can
    + * and not talk to the outside world. Caused by
    + * an 'ifconfig ethX down'
    + */
    +static int bf537mac_close(struct net_device *dev)
    +{
    + pr_debug("%s: %s\n", dev->name, __FUNCTION__);
    +
    + netif_stop_queue(dev);
    + netif_carrier_off(dev);
    +
    + /* clear everything */
    + bf537mac_shutdown(dev);
    +
    + /* free the rx/tx buffers */
    + desc_list_free();
    +
    + return 0;
    +}
    +
    +static int __init bf537mac_probe(struct net_device *dev)
    +{
    + struct bf537mac_local *lp = netdev_priv(dev);
    + int retval;
    +
    + /* Grab the MAC address in the MAC */
    + *(u32 *) (&(dev->dev_addr[0])) = bfin_read_EMAC_ADDRLO();
    + *(u16 *) (&(dev->dev_addr[4])) = (u16) bfin_read_EMAC_ADDRHI();
    +
    +/* probe mac */
    + /*todo: how to proble? which is revision_register */
    + bfin_write_EMAC_ADDRLO(0x12345678);
    + if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
    + pr_debug("can't detect bf537 mac!\n");
    + retval = -ENODEV;
    + goto err_out;
    + }
    +
    + /*Is it valid? (Did bootloader initialize it?) */
    + if (!is_valid_ether_addr(dev->dev_addr)) {
    + /* Grab the MAC from the board somehow - this is done in the
    + arch/blackfin/mach-bf537/boards/eth_mac.c */
    + get_bf537_ether_addr(dev->dev_addr);
    + }
    +
    + /* If still not valid, get a random one */
    + if (!is_valid_ether_addr(dev->dev_addr)) {
    + random_ether_addr(dev->dev_addr);
    + }
    +
    + setup_mac_addr(dev->dev_addr);
    +
    + /* Fill in the fields of the device structure with ethernet values. */
    + ether_setup(dev);
    +
    + dev->open = bf537mac_open;
    + dev->stop = bf537mac_close;
    + dev->hard_start_xmit = bf537mac_hard_start_xmit;
    + dev->tx_timeout = bf537mac_timeout;
    + dev->get_stats = bf537mac_query_statistics;
    + dev->set_multicast_list = bf537mac_set_multicast_list;
    +#ifdef DVR_DEBUG
    + dev->ethtool_ops = &bf537mac_ethtool_ops;
    +#endif
    +#ifdef CONFIG_NET_POLL_CONTROLLER
    + dev->poll_controller = bf537mac_poll;
    +#endif
    +
    + /* fill in some of the fields */
    + lp->version = 1;
    + lp->PhyAddr = 0x01;
    + lp->CLKIN = 25;
    + lp->FullDuplex = 0;
    + lp->Negotiate = 1;
    + lp->FlowControl = 0;
    + spin_lock_init(&lp->lock);
    +
    + /* set the GPIO pins to Ethernet mode */
    + setup_pin_mux();
    +
    + /* now, enable interrupts */
    + /* register irq handler */
    + if (request_irq
    + (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
    + "BFIN537_MAC_RX", dev)) {
    + printk(KERN_WARNING CARDNAME
    + ": Unable to attach BlackFin MAC RX interrupt\n");
    + return -EBUSY;
    + }
    +
    + /* Enable PHY output early */
    + if (!(bfin_read_VR_CTL() & PHYCLKOE))
    + bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
    +
    + retval = register_netdev(dev);
    + if (retval == 0) {
    + /* now, print out the card info, in a short format.. */
    + printk(KERN_INFO "Blackfin mac net device registered\n");
    + }
    +
    +err_out:
    + return retval;
    +}
    +
    +static int bfin_mac_probe(struct platform_device *pdev)
    +{
    + struct net_device *ndev;
    +
    + ndev = alloc_etherdev(sizeof(struct bf537mac_local));
    + if (!ndev) {
    + printk(KERN_WARNING CARDNAME ": could not allocate device\n");
    + return -ENOMEM;
    + }
    +
    + SET_MODULE_OWNER(ndev);
    + SET_NETDEV_DEV(ndev, &pdev->dev);
    +
    + platform_set_drvdata(pdev, ndev);
    +
    + if (bf537mac_probe(ndev) != 0) {
    + platform_set_drvdata(pdev, NULL);
    + free_netdev(ndev);
    + printk(KERN_WARNING CARDNAME ": not found\n");
    + return -ENODEV;
    + }
    +
    + return 0;
    +}
    +
    +static int bfin_mac_remove(struct platform_device *pdev)
    +{
    + struct net_device *ndev = platform_get_drvdata(pdev);
    +
    + platform_set_drvdata(pdev, NULL);
    +
    + unregister_netdev(ndev);
    +
    + free_irq(IRQ_MAC_RX, ndev);
    +
    + free_netdev(ndev);
    +
    + return 0;
    +}
    +
    +static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t state)
    +{
    + return 0;
    +}
    +
    +static int bfin_mac_resume(struct platform_device *pdev)
    +{
    + return 0;
    +}
    +
    +static struct platform_driver bfin_mac_driver = {
    + .probe = bfin_mac_probe,
    + .remove = bfin_mac_remove,
    + .resume = bfin_mac_resume,
    + .suspend = bfin_mac_suspend,
    + .driver = {
    + .name = CARDNAME,
    + },
    +};
    +
    +static int __init bfin_mac_init(void)
    +{
    + return platform_driver_register(&bfin_mac_driver);
    +}
    +
    +module_init(bfin_mac_init);
    +
    +static void __exit bfin_mac_cleanup(void)
    +{
    + platform_driver_unregister(&bfin_mac_driver);
    +}
    +
    +module_exit(bfin_mac_cleanup);
    diff --git a/drivers/net/bfin_mac.h b/drivers/net/bfin_mac.h
    new file mode 100644
    index 0000000..2d5d145
    --- /dev/null
    +++ b/drivers/net/bfin_mac.h
    @@ -0,0 +1,144 @@
    +/*
    + * File: drivers/net/bfin_mac.c
    + * Based on:
    + * Maintainer:
    + * Bryan Wu <bryan.wu@analog.com>
    + *
    + * Original author:
    + * Luke Yang <luke.yang@analog.com>
    + *
    + * Created:
    + * Description:
    + *
    + * Modified:
    + * Copyright 2004-2006 Analog Devices Inc.
    + *
    + * Bugs: Enter bugs at http://blackfin.uclinux.org/
    + *
    + * This program is free software ; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License as published by
    + * the Free Software Foundation ; either version 2, or (at your option)
    + * any later version.
    + *
    + * This program is distributed in the hope that it will be useful,
    + * but WITHOUT ANY WARRANTY ; without even the implied warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    + * GNU General Public License for more details.
    + *
    + * You should have received a copy of the GNU General Public License
    + * along with this program ; see the file COPYING.
    + * If not, write to the Free Software Foundation,
    + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
    + */
    +
    +/*
    + * PHY REGISTER NAMES
    + */
    +#define PHYREG_MODECTL 0x0000
    +#define PHYREG_MODESTAT 0x0001
    +#define PHYREG_PHYID1 0x0002
    +#define PHYREG_PHYID2 0x0003
    +#define PHYREG_ANAR 0x0004
    +#define PHYREG_ANLPAR 0x0005
    +#define PHYREG_ANER 0x0006
    +#define PHYREG_NSR 0x0010
    +#define PHYREG_LBREMR 0x0011
    +#define PHYREG_REC 0x0012
    +#define PHYREG_10CFG 0x0013
    +#define PHYREG_PHY1_1 0x0014
    +#define PHYREG_PHY1_2 0x0015
    +#define PHYREG_PHY2 0x0016
    +#define PHYREG_TW_1 0x0017
    +#define PHYREG_TW_2 0x0018
    +#define PHYREG_TEST 0x0019
    +
    +#define PHY_RESET 0x8000
    +#define PHY_ANEG_EN 0x1000
    +#define PHY_DUPLEX 0x0100
    +#define PHY_SPD_SET 0x2000
    +
    +#define BFIN_MAC_CSUM_OFFLOAD
    +
    +struct dma_config_reg {
    + unsigned short b_DMA_EN:1; /* Bit 0 : DMA Enable */
    + unsigned short b_WNR:1; /* Bit 1 : DMA Direction */
    + unsigned short b_WDSIZE:2; /* Bit 2 & 3 : DMA Tranfer Word size */
    + unsigned short b_DMA2D:1; /* Bit 4 : DMA Mode 2D or 1D */
    + unsigned short b_RESTART:1; /* Bit 5 : Retain the FIFO */
    + unsigned short b_DI_SEL:1; /* Bit 6 : Data Interrupt Timing Select */
    + unsigned short b_DI_EN:1; /* Bit 7 : Data Interrupt Enable */
    + unsigned short b_NDSIZE:4; /* Bit 8 to 11 : Flex descriptor Size */
    + unsigned short b_FLOW:3; /* Bit 12 to 14 : FLOW */
    +};
    +
    +struct dma_descriptor {
    + struct dma_descriptor *next_dma_desc;
    + unsigned long start_addr;
    + struct dma_config_reg config;
    + unsigned short x_count;
    +};
    +
    +struct status_area_rx {
    +#if defined(BFIN_MAC_CSUM_OFFLOAD)
    + unsigned short ip_hdr_csum; /* ip header checksum */
    + /* ip payload(udp or tcp or others) checksum */
    + unsigned short ip_payload_csum;
    +#endif
    + unsigned long status_word; /* the frame status word */
    +};
    +
    +struct status_area_tx {
    + unsigned long status_word; /* the frame status word */
    +};
    +
    +/* use two descriptors for a packet */
    +struct net_dma_desc_rx {
    + struct net_dma_desc_rx *next;
    + struct sk_buff *skb;
    + struct dma_descriptor desc_a;
    + struct dma_descriptor desc_b;
    + struct status_area_rx status;
    +};
    +
    +/* use two descriptors for a packet */
    +struct net_dma_desc_tx {
    + struct net_dma_desc_tx *next;
    + struct sk_buff *skb;
    + struct dma_descriptor desc_a;
    + struct dma_descriptor desc_b;
    + unsigned char packet[1560];
    + struct status_area_tx status;
    +};
    +
    +struct bf537mac_local {
    + /*
    + * these are things that the kernel wants me to keep, so users
    + * can find out semi-useless statistics of how well the card is
    + * performing
    + */
    + struct net_device_stats stats;
    +
    + int version;
    +
    + int FlowEnabled; /* record if data flow is active */
    + int EtherIntIVG; /* IVG for the ethernet interrupt */
    + int RXIVG; /* IVG for the RX completion */
    + int TXIVG; /* IVG for the TX completion */
    + int PhyAddr; /* PHY address */
    + int OpMode; /* set these bits n the OPMODE regs */
    + int Port10; /* set port speed to 10 Mbit/s */
    + int GenChksums; /* IP checksums to be calculated */
    + int NoRcveLnth; /* dont insert recv length at start of buffer */
    + int StripPads; /* remove trailing pad bytes */
    + int FullDuplex; /* set full duplex mode */
    + int Negotiate; /* enable auto negotiation */
    + int Loopback; /* loopback at the PHY */
    + int Cache; /* Buffers may be cached */
    + int FlowControl; /* flow control active */
    + int CLKIN; /* clock in value in MHZ */
    + unsigned short IntMask; /* interrupt mask */
    + unsigned char Mac[6]; /* MAC address of the board */
    + spinlock_t lock;
    +};
    +
    +extern void get_bf537_ether_addr(char *addr);
    --
    1.5.2
    -
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