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net: zynq: Wait till packet is sent

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Wait till BD is processed to ensure that packet was sent successfully.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2015-08-17 09:57:46 +02:00
parent 603ff0081a
commit e4d2318adb
1 changed files with 32 additions and 1 deletions
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33
drivers/net/zynq_gem.c
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@ -23,6 +23,7 @@
#include <asm/system.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#include <asm-generic/errno.h>
#if !defined(CONFIG_PHYLIB)
# error XILINX_GEM_ETHERNET requires PHYLIB
@ -86,6 +87,8 @@
ZYNQ_GEM_DMACR_TXSIZE | \
ZYNQ_GEM_DMACR_RXBUF)
#define ZYNQ_GEM_TSR_DONE 0x00000020 /* Tx done mask */
/* Use MII register 1 (MII status register) to detect PHY */
#define PHY_DETECT_REG 1
@ -427,6 +430,33 @@ static int zynq_gem_init(struct eth_device *dev, bd_t * bis)
return 0;
}
static int wait_for_bit(const char *func, u32 *reg, const u32 mask,
bool set, unsigned int timeout)
{
u32 val;
unsigned long start = get_timer(0);
while (1) {
val = readl(reg);
if (!set)
val = ~val;
if ((val & mask) == mask)
return 0;
if (get_timer(start) > timeout)
break;
udelay(1);
}
debug("%s: Timeout (reg=%p mask=%08x wait_set=%i)\n",
func, reg, mask, set);
return -ETIMEDOUT;
}
static int zynq_gem_send(struct eth_device *dev, void *ptr, int len)
{
u32 addr, size;
@ -467,7 +497,8 @@ static int zynq_gem_send(struct eth_device *dev, void *ptr, int len)
if (priv->tx_bd->status & ZYNQ_GEM_TXBUF_EXHAUSTED)
printf("TX buffers exhausted in mid frame\n");
return 0;
return wait_for_bit(__func__, &regs->txsr, ZYNQ_GEM_TSR_DONE,
true, 20000);
}
/* Do not check frame_recd flag in rx_status register 0x20 - just poll BD */