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net: systemport: add suspend and resume support

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Implement the hardware recommended suspend/resume procedure for
SYSTEMPORT. We leverage the previous factoring work such that we can
logically break all suspend/resume operations into disctint RX and TX
code paths.

When the system enters S3, we will loose all register contents, so
make sure that we correctly re-program all the hardware and software
views of the RX & TX rings as well.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-07-01 21:08:38 -07:00 committed by David S. Miller
parent b02e6d9ba7
commit 40755a0fce
1 changed files with 160 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

164
drivers/net/ethernet/broadcom/bcmsysport.c
View file

@ -1311,11 +1311,19 @@ static void bcm_sysport_netif_start(struct net_device *dev)
netif_tx_start_all_queues(dev);
}
static void rbuf_init(struct bcm_sysport_priv *priv)
{
u32 reg;
reg = rbuf_readl(priv, RBUF_CONTROL);
reg |= RBUF_4B_ALGN | RBUF_RSB_EN;
rbuf_writel(priv, reg, RBUF_CONTROL);
}
static int bcm_sysport_open(struct net_device *dev)
{
struct bcm_sysport_priv *priv = netdev_priv(dev);
unsigned int i;
u32 reg;
int ret;
/* Reset UniMAC */
@ -1332,9 +1340,7 @@ static int bcm_sysport_open(struct net_device *dev)
umac_enable_set(priv, CMD_RX_EN | CMD_TX_EN, 0);
/* Enable RBUF 2bytes alignment and Receive Status Block */
reg = rbuf_readl(priv, RBUF_CONTROL);
reg |= RBUF_4B_ALGN | RBUF_RSB_EN;
rbuf_writel(priv, reg, RBUF_CONTROL);
rbuf_init(priv);
/* Set maximum frame length */
umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
@ -1640,6 +1646,155 @@ static int bcm_sysport_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int bcm_sysport_suspend(struct device *d)
{
struct net_device *dev = dev_get_drvdata(d);
struct bcm_sysport_priv *priv = netdev_priv(dev);
unsigned int i;
int ret;
u32 reg;
if (!netif_running(dev))
return 0;
bcm_sysport_netif_stop(dev);
phy_suspend(priv->phydev);
netif_device_detach(dev);
/* Disable UniMAC RX */
umac_enable_set(priv, CMD_RX_EN, 0);
ret = rdma_enable_set(priv, 0);
if (ret) {
netdev_err(dev, "RDMA timeout!\n");
return ret;
}
/* Disable RXCHK if enabled */
if (priv->rx_csum_en) {
reg = rxchk_readl(priv, RXCHK_CONTROL);
reg &= ~RXCHK_EN;
rxchk_writel(priv, reg, RXCHK_CONTROL);
}
/* Flush RX pipe */
topctrl_writel(priv, RX_FLUSH, RX_FLUSH_CNTL);
ret = tdma_enable_set(priv, 0);
if (ret) {
netdev_err(dev, "TDMA timeout!\n");
return ret;
}
/* Wait for a packet boundary */
usleep_range(2000, 3000);
umac_enable_set(priv, CMD_TX_EN, 0);
topctrl_writel(priv, TX_FLUSH, TX_FLUSH_CNTL);
/* Free RX/TX rings SW structures */
for (i = 0; i < dev->num_tx_queues; i++)
bcm_sysport_fini_tx_ring(priv, i);
bcm_sysport_fini_rx_ring(priv);
return 0;
}
static int bcm_sysport_resume(struct device *d)
{
struct net_device *dev = dev_get_drvdata(d);
struct bcm_sysport_priv *priv = netdev_priv(dev);
unsigned int i;
u32 reg;
int ret;
if (!netif_running(dev))
return 0;
/* Initialize both hardware and software ring */
for (i = 0; i < dev->num_tx_queues; i++) {
ret = bcm_sysport_init_tx_ring(priv, i);
if (ret) {
netdev_err(dev, "failed to initialize TX ring %d\n",
i);
goto out_free_tx_rings;
}
}
/* Initialize linked-list */
tdma_writel(priv, TDMA_LL_RAM_INIT_BUSY, TDMA_STATUS);
/* Initialize RX ring */
ret = bcm_sysport_init_rx_ring(priv);
if (ret) {
netdev_err(dev, "failed to initialize RX ring\n");
goto out_free_rx_ring;
}
netif_device_attach(dev);
/* Enable RX interrupt and TX ring full interrupt */
intrl2_0_mask_clear(priv, INTRL2_0_RDMA_MBDONE | INTRL2_0_TX_RING_FULL);
/* RX pipe enable */
topctrl_writel(priv, 0, RX_FLUSH_CNTL);
ret = rdma_enable_set(priv, 1);
if (ret) {
netdev_err(dev, "failed to enable RDMA\n");
goto out_free_rx_ring;
}
/* Enable rxhck */
if (priv->rx_csum_en) {
reg = rxchk_readl(priv, RXCHK_CONTROL);
reg |= RXCHK_EN;
rxchk_writel(priv, reg, RXCHK_CONTROL);
}
rbuf_init(priv);
/* Set maximum frame length */
umac_writel(priv, UMAC_MAX_MTU_SIZE, UMAC_MAX_FRAME_LEN);
/* Set MAC address */
umac_set_hw_addr(priv, dev->dev_addr);
umac_enable_set(priv, CMD_RX_EN, 1);
/* TX pipe enable */
topctrl_writel(priv, 0, TX_FLUSH_CNTL);
umac_enable_set(priv, CMD_TX_EN, 1);
ret = tdma_enable_set(priv, 1);
if (ret) {
netdev_err(dev, "TDMA timeout!\n");
goto out_free_rx_ring;
}
phy_resume(priv->phydev);
bcm_sysport_netif_start(dev);
return 0;
out_free_rx_ring:
bcm_sysport_fini_rx_ring(priv);
out_free_tx_rings:
for (i = 0; i < dev->num_tx_queues; i++)
bcm_sysport_fini_tx_ring(priv, i);
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(bcm_sysport_pm_ops,
bcm_sysport_suspend, bcm_sysport_resume);
static const struct of_device_id bcm_sysport_of_match[] = {
{ .compatible = "brcm,systemport-v1.00" },
{ .compatible = "brcm,systemport" },
@ -1653,6 +1808,7 @@ static struct platform_driver bcm_sysport_driver = {
.name = "brcm-systemport",
.owner = THIS_MODULE,
.of_match_table = bcm_sysport_of_match,
.pm = &bcm_sysport_pm_ops,
},
};
module_platform_driver(bcm_sysport_driver);