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Date: Mon, 09 Jul 2007 15:14:19 -0400
From: Sinan Akman <sinan@...teme.com>
To: akpm@...ux-foundation.org
CC: jeff@...zik.org, netdev@...r.kernel.org, bryan.wu@...log.com
Subject: Re: [patch 2/7] Blackfin: on-chip ethernet MAC controller driver
akpm@...ux-foundation.org wrote:
>From: "Wu, Bryan" <bryan.wu@...log.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@...log.com>
>Cc: Jeff Garzik <jeff@...zik.org>
>Signed-off-by: Andrew Morton <akpm@...ux-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
>@@ -821,6 +821,50 @@ 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 -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
>@@ -195,6 +195,7 @@ 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@...log.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>
>
>
Something very minor, but are
netdevice.h, etherdevice.h etc
being included here twice ?
>+
>+#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@...log.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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