path: root/drivers/net/bfin_mac.c

/*
 * Blackfin On-Chip MAC Driver
 *
 * Copyright 2004-2007 Analog Devices Inc.
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Licensed under the GPL-2 or later.
 */

#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/mii.h>
#include <linux/phy.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>

#include <asm/dma.h>
#include <linux/dma-mapping.h>

#include <asm/blackfin.h>
#include <asm/cacheflush.h>
#include <asm/portmux.h>

#include "bfin_mac.h"

#define DRV_NAME	"bfin_mac"
#define DRV_VERSION	"1.1"
#define DRV_AUTHOR	"Bryan Wu, Luke Yang"
#define DRV_DESC	"Blackfin on-chip Ethernet MAC driver"

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_ALIAS("platform:bfin_mac");

#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_KERNEL)
# define bfin_mac_free(dma_handle, ptr) \
	dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
#endif

#define PKT_BUF_SZ 1580

#define MAX_TIMEOUT_CNT	500

/* 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;

#if defined(CONFIG_BFIN_MAC_RMII)
static u16 pin_req[] = P_RMII0;
#else
static u16 pin_req[] = P_MII0;
#endif

static void bfin_mac_disable(void);
static void bfin_mac_enable(void);

static void desc_list_free(void)
{
	struct net_dma_desc_rx *r;
	struct net_dma_desc_tx *t;
	int i;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
	dma_addr_t dma_handle = 0;
#endif

	if (tx_desc) {
		t = tx_list_head;
		for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
			if (t) {
				if (t->skb) {
					dev_kfree_skb(t->skb);
					t->skb = NULL;
				}
				t = t->next;
			}
		}
		bfin_mac_free(dma_handle, tx_desc);
	}

	if (rx_desc) {
		r = rx_list_head;
		for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
			if (r) {
				if (r->skb) {
					dev_kfree_skb(r->skb);
					r->skb = NULL;
				}
				r = r->next;
			}
		}
		bfin_mac_free(dma_handle, rx_desc);
	}
}

static int desc_list_init(void)
{
	int i;
	struct sk_buff *new_skb;
#if !defined(CONFIG_BFIN_MAC_USE_L1)
	/*
	 * This dma_handle is useless in Blackfin dma_alloc_coherent().
	 * The real dma handler is the return value of dma_alloc_coherent().
	 */
	dma_addr_t dma_handle;
#endif

	tx_desc = bfin_mac_alloc(&<