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ar71xx: add some code to detect DMA stuck conditions on ar7240 

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@27975 3c298f89-4303-0410-b956-a3cf2f4a3e73
master
Felix Fietkau 2011-08-13 22:30:14 +00:00
parent 02c8410ffd
commit 56093f4fdb
4 changed files with 36 additions and 1 deletions
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2
target/linux/ar71xx/files/arch/mips/ar71xx/devices.c
View File

@ -589,6 +589,8 @@ void __init ar71xx_add_device_eth(unsigned int id)
pdata->set_pll = id ? ar724x_set_pll_ge1
: ar724x_set_pll_ge0;
pdata->is_ar724x = 1;
if (ar71xx_soc == AR71XX_SOC_AR7240)
pdata->is_ar7240 = 1;
if (!pdata->fifo_cfg1)
pdata->fifo_cfg1 = 0x0010ffff;

1
target/linux/ar71xx/files/arch/mips/include/asm/mach-ar71xx/platform.h
View File

@ -29,6 +29,7 @@ struct ag71xx_platform_data {
u8 has_gbit:1;
u8 is_ar91xx:1;
u8 is_ar7240:1;
u8 is_ar724x:1;
u8 has_ar8216:1;
u8 has_ar7240_switch:1;

4
target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h
View File

@ -236,6 +236,10 @@ static inline int ag71xx_desc_pktlen(struct ag71xx_desc *desc)
#define AG71XX_REG_INT_ENABLE 0x0198
#define AG71XX_REG_INT_STATUS 0x019c
#define AG71XX_REG_FIFO_DEPTH 0x01a8
#define AG71XX_REG_RX_SM 0x01b0
#define AG71XX_REG_TX_SM 0x01b4
#define MAC_CFG1_TXE BIT(0) /* Tx Enable */
#define MAC_CFG1_STX BIT(1) /* Synchronize Tx Enable */
#define MAC_CFG1_RXE BIT(2) /* Rx Enable */

30
target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
View File

@ -805,9 +805,33 @@ static void ag71xx_restart_work_func(struct work_struct *work)
ag71xx_open(ag->dev);
}
static bool ag71xx_check_dma_stuck(struct ag71xx *ag, unsigned long timestamp)
{
u32 rx_sm, tx_sm, rx_fd;
if (likely(time_before(jiffies, timestamp + HZ/10)))
return false;
if (!netif_carrier_ok(ag->dev))
return false;
rx_sm = ag71xx_rr(ag, AG71XX_REG_RX_SM);
if ((rx_sm & 0x7) == 0x3 && ((rx_sm >> 4) & 0x7) == 0x6)
return true;
tx_sm = ag71xx_rr(ag, AG71XX_REG_TX_SM);
rx_fd = ag71xx_rr(ag, AG71XX_REG_FIFO_DEPTH);
if (((tx_sm >> 4) & 0x7) == 0 && ((rx_sm & 0x7) == 0) &&
((rx_sm >> 4) & 0x7) == 0 && rx_fd == 0)
return true;
return false;
}
static int ag71xx_tx_packets(struct ag71xx *ag)
{
struct ag71xx_ring *ring = &ag->tx_ring;
struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
int sent;
DBG("%s: processing TX ring\n", ag->dev->name);
@ -818,8 +842,12 @@ static int ag71xx_tx_packets(struct ag71xx *ag)
struct ag71xx_desc *desc = ring->buf[i].desc;
struct sk_buff *skb = ring->buf[i].skb;
if (!ag71xx_desc_empty(desc))
if (!ag71xx_desc_empty(desc)) {
if (pdata->is_ar7240 &&
ag71xx_check_dma_stuck(ag, ring->buf[i].timestamp))
schedule_work(&ag->restart_work);
break;
}
ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);