arm-linux开发环境搭建

/* * linux/drivers/net/cs8900.c * * Author: Abraham van der Merwe <abraham at 2d3d.co.za> * * A Cirrus Logic CS8900A driver for Linux * based on the cs89x0 driver written by Russell Nelson, * Donald Becker, and others. * * This source code is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * History: * 22-May-2002 Initial version (Abraham vd Merwe) * 30-May-2002 Added char device support for eeprom (Frank Becker) * 24-Jan-2004 Fixups for 2.6 (Frank Becker) * 15-July-2004 Modified for SMDK2410 (Roc Wu pwu at jadechip.com) */ #define VERSION_STRING "Cirrus Logic CS8900A driver for Linux (Modified for SMDK2410)" /* * At the moment the driver does not support memory mode operation. * It is trivial to implement this, but not worth the effort. */ /* * TODO: * * 1. Sort out ethernet checksum * 2. If !ready in send_start(), queue buffer and send it in interrupt handler * when we receive a BufEvent with Rdy4Tx, send it again. dangerous! * 3. how do we prevent interrupt handler destroying integrity of get_stats()? * 4. Change reset code to check status. * 5. Implement set_mac_address and remove fake mac address * 7. Link status detection stuff * 8. Write utility to write EEPROM, do self testing, etc. * 9. Implement DMA routines (I need a board w/ DMA support for that) * 10. Power management * 11. Add support for multiple ethernet chips */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/types.h> #include <linux/version.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/ioport.h> #include <linux/pm.h> #include <linux/irq.h> #include <asm/hardware.h> #include <asm/io.h> #include <asm/uaccess.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> // Added BSt #include <asm/mach-types.h> #ifdef CONFIG_ARCH_SMDK2410 #include "asm/arch-s3c2410/regs-irq.h" #endif #include "cs8900.h" //#define FULL_DUPLEX //#define DEBUG typedef struct { struct net_device_stats stats; u16 txlen; int char_devnum; spinlock_t lock; } cs8900_t; int cs8900_probe (struct net_device *dev); static struct net_device *cs8900_dev ; /* * There seems to be no way to determine the exact size of the eeprom, * so we use the largest size. * FIXME: Verify it's safe to read/write past the end of a 64/128 * byte eeprom. * * Possible eeprom sizes: * Cx46 - 64 bytes * Cx56 - 128 bytes * Cx66 - 256 bytes */ #define MAX_EEPROM_SIZE 256 /* * I/O routines */ static inline u16 cs8900_read (struct net_device *dev,u16 reg) { outw (reg,dev->base_addr + PP_Address); return (inw (dev->base_addr + PP_Data)); } static inline void cs8900_write (struct net_device *dev,u16 reg,u16 value) { outw (reg,dev->base_addr + PP_Address); outw (value,dev->base_addr + PP_Data); } static inline void cs8900_set (struct net_device *dev,u16 reg,u16 value) { cs8900_write (dev,reg,cs8900_read (dev,reg) | value); } static inline void cs8900_clear (struct net_device *dev,u16 reg,u16 value) { cs8900_write (dev,reg,cs8900_read (dev,reg) & ~value); } static inline void cs8900_frame_read (struct net_device *dev,struct sk_buff *skb,u16 length) { insw (dev->base_addr,skb_put (skb,length),(length + 1) / 2); } static inline void cs8900_frame_write (struct net_device *dev,struct sk_buff *skb) { outsw (dev->base_addr,skb->data,(skb->len + 1) / 2); } /* * Debugging functions */ #ifdef DEBUG static inline int printable (int c) { return ((c >= 32 && c <= 126) || (c >= 174 && c <= 223) || (c >= 242 && c <= 243) || (c >= 252 && c <= 253)); } static void dump16 (struct net_device *dev,const u8 *s,size_t len) { int i; char str[128]; if (!len) return; *str = '\0'; for (i = 0; i < len; i++) { if (i && !(i % 4)) strcat (str," "); sprintf (str,"%s%.2x ",str,s[i]); } for ( ; i < 16; i++) { if (i && !(i % 4)) strcat (str," "); strcat (str," "); } strcat (str," "); for (i = 0; i < len; i++) sprintf (str,"%s%c",str,printable (s[i]) ? s[i] : '.'); printk (KERN_DEBUG "%s: %s\n",dev->name,str); } static void hexdump (struct net_device *dev,const void *ptr,size_t size) { const u8 *s = (u8 *) ptr; int i; for (i = 0; i < size / 16; i++, s += 16) dump16 (dev,s,16); dump16 (dev,s,size % 16); } static void dump_packet (struct net_device *dev,struct sk_buff *skb,const char *type) { printk (KERN_INFO "%s: %s %d byte frame %.2x:%.2x:%.2x:%.2x:%.2x:%.2x to %.2x:%.2x:%.2x:%.2x:%.2x:%.2x type %.4x\n", dev->name, type, skb->len, skb->data[0],skb->data[1],skb->data[2],skb->data[3],skb->data[4],skb->data[5], skb->data[6],skb->data[7],skb->data[8],skb->data[9],skb->data[10],skb->data[11], (skb->data[12] << 8) | skb->data[13]); if (skb->len < 0x100) hexdump (dev,skb->data,skb->len); } #endif /* #ifdef DEBUG */ /* * Driver functions */ static void cs8900_receive (struct net_device *dev) { cs8900_t *priv = (cs8900_t *) dev->priv; struct sk_buff *skb; u16 status,length; status = cs8900_read (dev,PP_RxStatus); length = cs8900_read (dev,PP_RxLength); if (!(status & RxOK)) { priv->stats.rx_errors++; if ((status & (Runt | Extradata))) priv->stats.rx_length_errors++; if ((status & CRCerror)) priv->stats.rx_crc_errors++; return; } if ((skb = dev_alloc_skb (length + 4)) == NULL) { priv->stats.rx_dropped++; return; } skb->dev = dev; skb_reserve (skb,2); cs8900_frame_read (dev,skb,length); #ifdef FULL_DUPLEX dump_packet (dev,skb,"recv"); #endif /* #ifdef FULL_DUPLEX */ skb->protocol = eth_type_trans (skb,dev); netif_rx (skb); dev->last_rx = jiffies; priv->stats.rx_packets++; priv->stats.rx_bytes += length; } static int cs8900_send_start (struct sk_buff *skb,struct net_device *dev) { cs8900_t *priv = (cs8900_t *) dev->priv; u16 status; spin_lock_irq(&priv->lock); netif_stop_queue (dev); cs8900_write (dev,PP_TxCMD,TxStart (After5)); cs8900_write (dev,PP_TxLength,skb->len); status = cs8900_read (dev,PP_BusST); if ((status & TxBidErr)) { spin_unlock_irq(&priv->lock); printk (KERN_WARNING "%s: Invalid frame size %d!\n",dev->name,skb->len); priv->stats.tx_errors++; priv->stats.tx_aborted_errors++; priv->txlen = 0; return (1); } if (!(status & Rdy4TxNOW)) { spin_unlock_irq(&priv->lock); printk (KERN_WARNING "%s: Transmit buffer not free!\n",dev->name); priv->stats.tx_errors++; priv->txlen = 0; /* FIXME: store skb and send it in interrupt handler */ return (1); } cs8900_frame_write (dev,skb); spin_unlock_irq(&priv->lock); #ifdef DEBUG dump_packet (dev,skb,"send"); #endif /* #ifdef DEBUG */ dev->trans_start = jiffies; dev_kfree_skb (skb); priv->txlen = skb->len; return (0); } static irqreturn_t cs8900_interrupt (int irq,void *id) { struct net_device *dev = (struct net_device *) id; cs8900_t *priv; volatile u16 status; irqreturn_t handled = 0; if (dev->priv == NULL) { printk (KERN_WARNING "%s: irq %d for unknown device.\n",dev->name,irq); return 0; } priv = (cs8900_t *) dev->priv; while ((status = cs8900_read (dev, PP_ISQ))) { handled = 1; switch (RegNum (status)) { case RxEvent: cs8900_receive (dev); break; case TxEvent: priv->stats.collisions += ColCount (cs8900_read (dev,PP_TxCOL)); if (!(RegContent (status) & TxOK)) { priv->stats.tx_errors++; if ((RegContent (status) & Out_of_window)) priv->stats.tx_window_errors++; if ((RegContent (status) & Jabber)) priv->stats.tx_aborted_errors++; break; } else if (priv->txlen) { priv->stats.tx_packets++; priv->stats.tx_bytes += priv->txlen; } priv->txlen = 0; netif_wake_queue (dev); break; case BufEvent: if ((RegContent (status) & RxMiss)) { u16 missed = MissCount (cs8900_read (dev,PP_RxMISS)); priv->stats.rx_errors += missed; priv->stats.rx_missed_