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openwrt-xburst/target/linux/ramips/files/drivers/net/ramips.c

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/*
* 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; version 2 of the License
*
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2009 John Crispin <blogic@openwrt.org>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <ramips_eth_platform.h>
#include "ramips_eth.h"
#define TX_TIMEOUT (20 * HZ / 100)
#define MAX_RX_LENGTH 1600
#ifdef CONFIG_RALINK_RT305X
#include "ramips_esw.c"
#endif
#define phys_to_bus(a) (a & 0x1FFFFFFF)
static struct net_device * ramips_dev;
static void __iomem *ramips_fe_base = 0;
static inline void
ramips_fe_wr(u32 val, unsigned reg)
{
__raw_writel(val, ramips_fe_base + reg);
}
static inline u32
ramips_fe_rr(unsigned reg)
{
return __raw_readl(ramips_fe_base + reg);
}
static void
ramips_cleanup_dma(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
int i;
for (i = 0; i < NUM_RX_DESC; i++)
if (priv->rx_skb[i])
dev_kfree_skb_any(priv->rx_skb[i]);
if (priv->rx)
dma_free_coherent(NULL,
NUM_RX_DESC * sizeof(struct ramips_rx_dma),
priv->rx, priv->phy_rx);
if (priv->tx)
dma_free_coherent(NULL,
NUM_TX_DESC * sizeof(struct ramips_tx_dma),
priv->tx, priv->phy_tx);
}
static int
ramips_alloc_dma(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
int err = -ENOMEM;
int i;
priv->skb_free_idx = 0;
/* setup tx ring */
priv->tx = dma_alloc_coherent(NULL,
NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
if (!priv->tx)
goto err_cleanup;
for(i = 0; i < NUM_TX_DESC; i++)
{
memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
}
/* setup rx ring */
priv->rx = dma_alloc_coherent(NULL,
NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
if (!priv->rx)
goto err_cleanup;
memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
for(i = 0; i < NUM_RX_DESC; i++)
{
struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
if (!new_skb)
goto err_cleanup;
skb_reserve(new_skb, 2);
priv->rx[i].rxd1 =
dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
DMA_FROM_DEVICE);
priv->rx[i].rxd2 |= RX_DMA_LSO;
priv->rx_skb[i] = new_skb;
}
return 0;
err_cleanup:
ramips_cleanup_dma(dev);
return err;
}
static void
ramips_setup_dma(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
}
static int
ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
unsigned long tx;
unsigned int tx_next;
unsigned int mapped_addr;
unsigned long flags;
if(priv->plat->min_pkt_len)
{
if(skb->len < priv->plat->min_pkt_len)
{
if(skb_padto(skb, priv->plat->min_pkt_len))
{
printk(KERN_ERR "ramips_eth: skb_padto failed\n");
kfree_skb(skb);
return 0;
}
skb_put(skb, priv->plat->min_pkt_len - skb->len);
}
}
dev->trans_start = jiffies;
mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
DMA_TO_DEVICE);
dma_sync_single_for_device(NULL, mapped_addr, skb->len, DMA_TO_DEVICE);
spin_lock_irqsave(&priv->page_lock, flags);
tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
if(tx == NUM_TX_DESC - 1)
tx_next = 0;
else
tx_next = tx + 1;
if((priv->tx_skb[tx]) || (priv->tx_skb[tx_next]) ||
!(priv->tx[tx].txd2 & TX_DMA_DONE) || !(priv->tx[tx_next].txd2 & TX_DMA_DONE))
goto out;
priv->tx[tx].txd1 = mapped_addr;
priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
priv->tx_skb[tx] = skb;
wmb();
ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
spin_unlock_irqrestore(&priv->page_lock, flags);
return NETDEV_TX_OK;
out:
spin_unlock_irqrestore(&priv->page_lock, flags);
dev->stats.tx_dropped++;
kfree_skb(skb);
return NETDEV_TX_OK;
}
static void
ramips_eth_rx_hw(unsigned long ptr)
{
struct net_device *dev = (struct net_device*)ptr;
struct raeth_priv *priv = netdev_priv(dev);
int rx;
int max_rx = 16;
while(max_rx)
{
struct sk_buff *rx_skb, *new_skb;
rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
break;
max_rx--;
rx_skb = priv->rx_skb[rx];
rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
rx_skb->dev = dev;
rx_skb->protocol = eth_type_trans(rx_skb, dev);
rx_skb->ip_summed = CHECKSUM_NONE;
dev->stats.rx_packets++;
dev->stats.rx_bytes += rx_skb->len;
netif_rx(rx_skb);
new_skb = netdev_alloc_skb(dev, MAX_RX_LENGTH + 2);
priv->rx_skb[rx] = new_skb;
BUG_ON(!new_skb);
skb_reserve(new_skb, 2);
priv->rx[rx].rxd1 =
dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
DMA_FROM_DEVICE);
priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
wmb();
ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
}
if(max_rx == 0)
tasklet_schedule(&priv->rx_tasklet);
else
ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
RAMIPS_FE_INT_ENABLE);
}
static void
ramips_eth_tx_housekeeping(unsigned long ptr)
{
struct net_device *dev = (struct net_device*)ptr;
struct raeth_priv *priv = netdev_priv(dev);
while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
(priv->tx_skb[priv->skb_free_idx]))
{
dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
priv->tx_skb[priv->skb_free_idx] = 0;
priv->skb_free_idx++;
if(priv->skb_free_idx >= NUM_TX_DESC)
priv->skb_free_idx = 0;
}
ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
RAMIPS_FE_INT_ENABLE);
}
static int
ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
{
unsigned char *mac = (unsigned char*)priv;
if(netif_running(dev))
return -EBUSY;
memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
(mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
return 0;
}
static void
ramips_eth_timeout(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
tasklet_schedule(&priv->tx_housekeeping_tasklet);
}
static irqreturn_t
ramips_eth_irq(int irq, void *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
if(fe_int & RAMIPS_RX_DLY_INT)
{
ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
RAMIPS_FE_INT_ENABLE);
tasklet_schedule(&priv->rx_tasklet);
}
if(fe_int & RAMIPS_TX_DLY_INT)
ramips_eth_tx_housekeeping((unsigned long)dev);
return IRQ_HANDLED;
}
static int
ramips_eth_open(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
int err;
err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
dev->name, dev);
if (err)
return err;
err = ramips_alloc_dma(dev);
if (err)
goto err_free_irq;
ramips_setup_dma(dev);
ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
RAMIPS_PDMA_GLO_CFG);
ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
RAMIPS_FE_GLO_CFG);
tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
(unsigned long)dev);
tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
RAMIPS_GDMA1_FWD_CFG);
ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
RAMIPS_CDMA_CSG_CFG);
ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
ramips_fe_wr(1, RAMIPS_FE_RST_GL);
ramips_fe_wr(0, RAMIPS_FE_RST_GL);
netif_start_queue(dev);
return 0;
err_free_irq:
free_irq(dev->irq, dev);
return err;
}
static int
ramips_eth_stop(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
free_irq(dev->irq, dev);
netif_stop_queue(dev);
tasklet_kill(&priv->tx_housekeeping_tasklet);
tasklet_kill(&priv->rx_tasklet);
ramips_cleanup_dma(dev);
printk(KERN_DEBUG "ramips_eth: stopped\n");
return 0;
}
static int __init
ramips_eth_probe(struct net_device *dev)
{
struct raeth_priv *priv = netdev_priv(dev);
struct sockaddr addr;
BUG_ON(!priv->plat->reset_fe);
priv->plat->reset_fe();
net_srandom(jiffies);
memcpy(addr.sa_data, priv->plat->mac, 6);
ramips_eth_set_mac_addr(dev, &addr);
ether_setup(dev);
dev->open = ramips_eth_open;
dev->stop = ramips_eth_stop;
dev->hard_start_xmit = ramips_eth_hard_start_xmit;
dev->set_mac_address = ramips_eth_set_mac_addr;
dev->mtu = 1500;
dev->tx_timeout = ramips_eth_timeout;
dev->watchdog_timeo = TX_TIMEOUT;
spin_lock_init(&priv->page_lock);
return 0;
}
static int
ramips_eth_plat_probe(struct platform_device *plat)
{
struct raeth_priv *priv;
struct ramips_eth_platform_data *data = plat->dev.platform_data;
struct resource *res;
int err;
if (!data) {
dev_err(&plat->dev, "no platform data specified\n");
return -EINVAL;
}
res = platform_get_resource(plat, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&plat->dev, "no memory resource found\n");
return -ENXIO;
}
ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
if(!ramips_fe_base)
return -ENOMEM;
ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
if(!ramips_dev) {
dev_err(&plat->dev, "alloc_etherdev failed\n");
err = -ENOMEM;
goto err_unmap;
}
strcpy(ramips_dev->name, "eth%d");
ramips_dev->irq = platform_get_irq(plat, 0);
if (ramips_dev->irq < 0) {
dev_err(&plat->dev, "no IRQ resource found\n");
err = -ENXIO;
goto err_free_dev;
}
ramips_dev->addr_len = ETH_ALEN;
ramips_dev->base_addr = (unsigned long)ramips_fe_base;
ramips_dev->init = ramips_eth_probe;
priv = (struct raeth_priv*)netdev_priv(ramips_dev);
priv->plat = data;
err = register_netdev(ramips_dev);
if (err) {
dev_err(&plat->dev, "error bringing up device\n");
goto err_free_dev;
}
#ifdef CONFIG_RALINK_RT305X
rt305x_esw_init();
#endif
printk(KERN_DEBUG "ramips_eth: loaded\n");
return 0;
err_free_dev:
kfree(ramips_dev);
err_unmap:
iounmap(ramips_fe_base);
return err;
}
static int
ramips_eth_plat_remove(struct platform_device *plat)
{
unregister_netdev(ramips_dev);
free_netdev(ramips_dev);
printk(KERN_DEBUG "ramips_eth: unloaded\n");
return 0;
}
static struct platform_driver ramips_eth_driver = {
.probe = ramips_eth_plat_probe,
.remove = ramips_eth_plat_remove,
.driver = {
.name = "ramips_eth",
.owner = THIS_MODULE,
},
};
static int __init
ramips_eth_init(void)
{
int ret = platform_driver_register(&ramips_eth_driver);
if (ret)
printk(KERN_ERR
"ramips_eth: Error registering platfom driver!\n");
return ret;
}
static void __exit
ramips_eth_cleanup(void)
{
platform_driver_unregister(&ramips_eth_driver);
}
module_init(ramips_eth_init);
module_exit(ramips_eth_cleanup);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
MODULE_DESCRIPTION("ethernet driver for ramips boards");