Re: [PATCH -mm 3/5] Blackfin: on-chip ethernet MAC controller driver
From: Stephen Hemminger
Date: Thu Mar 01 2007 - 10:53:20 EST
Wu, Bryan wrote:
Hi folks,
Here is the blackfin on-chip ethernet MAC controller driver for Linux.
It's name is blackfin-driver-net-stamp537.patch
[PATCH] Blackfin: on-chip ethernet MAC controller driver
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@xxxxxxxxxx>
---
drivers/net/Kconfig | 44 ++
drivers/net/Makefile | 1
drivers/net/bfin_mac.c | 988 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/net/bfin_mac.h | 146 +++++++++
4 files changed, 1179 insertions(+)
Index: linux-2.6/drivers/net/Kconfig
===================================================================
--- linux-2.6.orig/drivers/net/Kconfig 2007-03-01 11:39:14.000000000 +0800
+++ linux-2.6/drivers/net/Kconfig 2007-03-01 11:39:19.000000000 +0800
@@ -836,6 +836,50 @@
module, say M here and read <file:Documentation/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
The regular practice is to put these in a device include file, and not
make them kernel configurable.
Why would you want to make it tuneable at compile time?
+
+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)
Index: linux-2.6/drivers/net/Makefile
===================================================================
--- linux-2.6.orig/drivers/net/Makefile 2007-03-01 11:33:24.000000000 +0800
+++ linux-2.6/drivers/net/Makefile 2007-03-01 11:39:19.000000000 +0800
@@ -195,6 +195,7 @@
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
Index: linux-2.6/drivers/net/bfin_mac.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6/drivers/net/bfin_mac.c 2007-03-01 11:39:19.000000000 +0800
@@ -0,0 +1,988 @@
+/*
+ * File: drivers/net/bfin_mac.c
+ * Based on:
+ * Author: Luke Yang <luke.yang@xxxxxxxxxx>
+ *
+ * Created:
+ * Description:
+ *
+ * Rev: $Id: bfin_mac.c,v 1.60 2006/12/16 11:23:56 hennerich Exp $
+ *
+ * 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 */
+struct net_dma_desc_tx *tx_list_head;
+struct net_dma_desc_tx *tx_list_tail;
+struct net_dma_desc_rx *rx_list_head;
+struct net_dma_desc_rx *rx_list_tail;
+struct net_dma_desc_rx *current_rx_ptr;
+struct net_dma_desc_tx *current_tx_ptr;
+struct net_dma_desc_tx *tx_desc;
+struct net_dma_desc_rx *rx_desc;
These should all be static
+
+extern void get_bf537_ether_addr(char *addr);
+
+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
Coding Style for Linux kernel is to *not* use C++ style comments (ie. //)
+ 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 SetupPinMux(void)
+{
+
Please do not use mixed case for function or structure member names (see
Coding Style)
-
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