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SubjectRe: [patch 089/181] Blackfin: on-chip ethernet MAC controller driver
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Date
Hi Jeff:

Could you please review this patch? Sorry for miss sending the patch to
you for review at beginning.

Thanks a lot
-Bryan Wu

On Sun, 2007-05-06 at 14:50 -0700, akpm@linux-foundation.org wrote:
> From: "Wu, Bryan" <bryan.wu@analog.com>
>
> This patch implements the driver necessary use the Analog Devices
> Blackfin processor's on-chip ethernet MAC controller.
>
> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
> Cc: Jeff Garzik <jeff@garzik.org>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> ---
>
> drivers/net/Kconfig | 44 +
> drivers/net/Makefile | 1
> drivers/net/bfin_mac.c | 981 +++++++++++++++++++++++++++++++++++++++
> drivers/net/bfin_mac.h | 147 +++++
> 4 files changed, 1173 insertions(+)
>
> diff -puN drivers/net/Kconfig~blackfin-on-chip-ethernet-mac-controller-driver drivers/net/Kconfig
> --- a/drivers/net/Kconfig~blackfin-on-chip-ethernet-mac-controller-driver
> +++ a/drivers/net/Kconfig
> @@ -836,6 +836,50 @@ config SMC91X
> module, say M here and read <file:Documentation/kbuild/modules.txt>
> as well as <file:Documentation/networking/net-modules.txt>.
>
> +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 -puN drivers/net/Makefile~blackfin-on-chip-ethernet-mac-controller-driver drivers/net/Makefile
> --- a/drivers/net/Makefile~blackfin-on-chip-ethernet-mac-controller-driver
> +++ a/drivers/net/Makefile
> @@ -194,6 +194,7 @@ 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 -puN /dev/null drivers/net/bfin_mac.c
> --- /dev/null
> +++ a/drivers/net/bfin_mac.c
> @@ -0,0 +1,981 @@
> +/*
> + * File: drivers/net/bfin_mac.c
> + * Based on:
> + * 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/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/io.h>
> +#include <asm/irq.h>
> +#include <asm/dma.h>
> +#include <linux/dma-mapping.h>
> +
> +#include <asm/irq.h>
> +#include <asm/blackfin.h>
> +#include <asm/delay.h>
> +
> +#include "bfin_mac.h"
> +
> +#define CARDNAME "bfin_mac"
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("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;
> + tmp_desc_tx->desc_a.config.b_DMA_EN = 0; /* disabled */
> + tmp_desc_tx->desc_a.config.b_WNR = 0; /* read from memory */
> + tmp_desc_tx->desc_a.config.b_WDSIZE = 2; /* wordsize is 32 bits */
> + tmp_desc_tx->desc_a.config.b_NDSIZE = 6; /* 6 half words is desc size. */
> + tmp_desc_tx->desc_a.config.b_FLOW = 7; /* large desc flow */
> + 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;
> + tmp_desc_tx->desc_b.config.b_DMA_EN = 1; /* enabled */
> + tmp_desc_tx->desc_b.config.b_WNR = 1; /* write to memory */
> + tmp_desc_tx->desc_b.config.b_WDSIZE = 2; /* wordsize is 32 bits */
> + tmp_desc_tx->desc_b.config.b_DI_EN = 0; /* disable interrupt */
> + tmp_desc_tx->desc_b.config.b_NDSIZE = 6;
> + tmp_desc_tx->desc_b.config.b_FLOW = 7; /* stop mode */
> + 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;
> + tmp_desc_rx->desc_a.config.b_DMA_EN = 1; /* enabled */
> + tmp_desc_rx->desc_a.config.b_WNR = 1; /* Write to memory */
> + tmp_desc_rx->desc_a.config.b_WDSIZE = 2; /* wordsize is 32 bits */
> + tmp_desc_rx->desc_a.config.b_NDSIZE = 6; /* 6 half words is desc size. */
> + tmp_desc_rx->desc_a.config.b_FLOW = 7; /* large desc flow */
> + 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;
> + tmp_desc_rx->desc_b.config.b_DMA_EN = 1; /* enabled */
> + tmp_desc_rx->desc_b.config.b_WNR = 1; /* Write to memory */
> + tmp_desc_rx->desc_b.config.b_WDSIZE = 2; /* wordsize is 32 bits */
> + tmp_desc_rx->desc_b.config.b_NDSIZE = 6;
> + tmp_desc_rx->desc_b.config.b_DI_EN = 1; /* enable interrupt */
> + tmp_desc_rx->desc_b.config.b_FLOW = 7; /* large mode */
> + 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();
> + bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) | SET_REGAD(RegAddr) | STABUSY); /* read mode */
> + 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);
> +
> + bfin_write_EMAC_STAADD(SET_PHYAD(PHYAddr) | SET_REGAD(RegAddr) | STAOP | STABUSY); /* write mode */
> +
> + 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 */
> +#if 0
> + 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 */
> + write_phy_reg(lp->PhyAddr, 30, 0x0ff); /* enable interrupts */
> + /* enable PHY_INT */
> + sysctl = bfin_read_EMAC_SYSCTL();
> + sysctl |= 0x1;
> +#if 0
> + 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, 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);
> +
> +#if 0
> + 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;
> + blackfin_dcache_flush_range(data, (data + (skb->len)) + 2); /* this is important! */
> +
> + } 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);
> + }
> +
> + current_tx_ptr->desc_a.config.b_DMA_EN = 1; /* enable this packet's dma */
> +
> + 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;
> +
> +#if 0
> + int i;
> + if (len >= 64) {
> + for (i=0;i<len;i++) {
> + printk("%.2x-",((unsigned char *)pkt)[i]);
> + if (((i%8)==0) && (i!=0)) printk("\n");
> + }
> + printk("\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/boards/bf537/boardname.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;
> +#if 0
> + 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;
> + }
> +
> + if (bf537mac_probe(ndev) != 0) {
> + platform_set_drvdata(pdev, NULL);
> + free_netdev(ndev);
> + printk(KERN_WARNING CARDNAME ": not found\n");
> + return -ENODEV;
> + }
> +
> + SET_MODULE_OWNER(ndev);
> + SET_NETDEV_DEV(ndev, &pdev->dev);
> +
> + platform_set_drvdata(pdev, ndev);
> +
> + 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 -puN /dev/null drivers/net/bfin_mac.h
> --- /dev/null
> +++ a/drivers/net/bfin_mac.h
> @@ -0,0 +1,147 @@
> +/*
> + * File: drivers/net/bfin_mac.h
> + * Based on:
> + * 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
> +
> +typedef struct _DMA_CONFIG {
> + 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 */
> +} DMA_CONFIG_REG;
> +
> +struct dma_descriptor {
> + struct dma_descriptor *next_dma_desc;
> + unsigned long start_addr;
> + DMA_CONFIG_REG config;
> + unsigned short x_count;
> +};
> +
> +#if 0
> +struct status_area {
> + unsigned short ip_hdr_chksum; /* the IP header checksum */
> + unsigned short ip_payload_chksum; /* the IP header and payload checksum */
> + unsigned long status_word; /* the frame status word */
> +};
> +#endif
> +
> +struct status_area_rx {
> +#if defined(BFIN_MAC_CSUM_OFFLOAD)
> + unsigned short ip_hdr_csum; /* ip header checksum */
> + unsigned short ip_payload_csum; /* ip payload(udp or tcp or others) checksum */
> +#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;
> + volatile 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;
> + volatile unsigned char packet[1560];
> + volatile 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);
> _
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