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Message-ID: <1362659421-11884-4-git-send-email-mugunthanvnm@ti.com>
Date: Thu, 7 Mar 2013 18:00:21 +0530
From: Mugunthan V N <mugunthanvnm@...com>
To: <netdev@...r.kernel.org>
CC: <davem@...emloft.net>, <devicetree-discuss@...ts.ozlabs.org>,
<linux-omap@...r.kernel.org>, <b-cousson@...com>, <paul@...an.com>,
Mugunthan V N <mugunthanvnm@...com>
Subject: [PATCH 3/3] driver: net: ethernet: cpsw: implement interrupt pacing via ethtool
This patch implements support for interrupt pacing block of CPSW via ethtool
Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
---
drivers/net/ethernet/ti/cpsw.c | 95 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index fa91eec..da7276d 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -126,6 +126,13 @@ do { \
#define CPSW_FIFO_DUAL_MAC_MODE (1 << 15)
#define CPSW_FIFO_RATE_LIMIT_MODE (2 << 15)
+#define CPSW_INTPACEEN (0x3f << 16)
+#define CPSW_INTPRESCALE_MASK (0x7FF << 0)
+#define CPSW_CMINTMAX_CNT 63
+#define CPSW_CMINTMIN_CNT 2
+#define CPSW_CMINTMAX_INTVL (1000 / CPSW_CMINTMIN_CNT)
+#define CPSW_CMINTMIN_INTVL ((1000 / CPSW_CMINTMAX_CNT) + 1)
+
#define cpsw_enable_irq(priv) \
do { \
u32 i; \
@@ -160,6 +167,15 @@ struct cpsw_wr_regs {
u32 rx_en;
u32 tx_en;
u32 misc_en;
+ u32 mem_allign1[8];
+ u32 rx_thresh_stat;
+ u32 rx_stat;
+ u32 tx_stat;
+ u32 misc_stat;
+ u32 mem_allign2[8];
+ u32 rx_imax;
+ u32 tx_imax;
+
};
struct cpsw_ss_regs {
@@ -314,6 +330,8 @@ struct cpsw_priv {
struct cpsw_host_regs __iomem *host_port_regs;
u32 msg_enable;
u32 version;
+ u32 coal_intvl;
+ u32 bus_freq_mhz;
struct net_device_stats stats;
int rx_packet_max;
int host_port;
@@ -612,6 +630,68 @@ static void cpsw_adjust_link(struct net_device *ndev)
}
}
+static int cpsw_get_coalesce(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ struct cpsw_priv *priv = netdev_priv(ndev);
+
+ coal->rx_coalesce_usecs = priv->coal_intvl;
+ return 0;
+}
+
+static int cpsw_set_coalesce(struct net_device *ndev,
+ struct ethtool_coalesce *coal)
+{
+ struct cpsw_priv *priv = netdev_priv(ndev);
+ u32 int_ctrl;
+ u32 num_interrupts = 0;
+ u32 prescale = 0;
+ u32 addnl_dvdr = 1;
+ u32 coal_intvl = 0;
+
+ if (!coal->rx_coalesce_usecs)
+ return -EINVAL;
+
+ coal_intvl = coal->rx_coalesce_usecs;
+
+ int_ctrl = readl(&priv->wr_regs->int_control);
+ prescale = priv->bus_freq_mhz * 4;
+
+ if (coal_intvl < CPSW_CMINTMIN_INTVL)
+ coal_intvl = CPSW_CMINTMIN_INTVL;
+
+ if (coal_intvl > CPSW_CMINTMAX_INTVL) {
+ /* Interrupt pacer works with 4us Pulse, we can
+ * throttle further by dilating the 4us pulse.
+ */
+ addnl_dvdr = CPSW_INTPRESCALE_MASK / prescale;
+
+ if (addnl_dvdr > 1) {
+ prescale *= addnl_dvdr;
+ if (coal_intvl > (CPSW_CMINTMAX_INTVL * addnl_dvdr))
+ coal_intvl = (CPSW_CMINTMAX_INTVL
+ * addnl_dvdr);
+ } else {
+ addnl_dvdr = 1;
+ coal_intvl = CPSW_CMINTMAX_INTVL;
+ }
+ }
+
+ num_interrupts = (1000 * addnl_dvdr) / coal_intvl;
+ writel(num_interrupts, &priv->wr_regs->rx_imax);
+ writel(num_interrupts, &priv->wr_regs->tx_imax);
+
+ int_ctrl |= CPSW_INTPACEEN;
+ int_ctrl &= (~CPSW_INTPRESCALE_MASK);
+ int_ctrl |= (prescale & CPSW_INTPRESCALE_MASK);
+ writel(int_ctrl, &priv->wr_regs->int_control);
+
+ cpsw_notice(priv, timer, "Set coalesce to %d usecs.\n", coal_intvl);
+ priv->coal_intvl = coal_intvl;
+
+ return 0;
+}
+
static inline int __show_stat(char *buf, int maxlen, const char *name, u32 val)
{
static char *leader = "........................................";
@@ -834,6 +914,14 @@ static int cpsw_ndo_open(struct net_device *ndev)
cpsw_info(priv, ifup, "submitted %d rx descriptors\n", i);
}
+ /* Enable Interrupt pacing if configured */
+ if (priv->coal_intvl != 0) {
+ struct ethtool_coalesce coal;
+
+ coal.rx_coalesce_usecs = (priv->coal_intvl << 4);
+ cpsw_set_coalesce(ndev, &coal);
+ }
+
cpdma_ctlr_start(priv->dma);
cpsw_intr_enable(priv);
napi_enable(&priv->napi);
@@ -1279,6 +1367,8 @@ static const struct ethtool_ops cpsw_ethtool_ops = {
.get_ts_info = cpsw_get_ts_info,
.get_settings = cpsw_get_settings,
.set_settings = cpsw_set_settings,
+ .get_coalesce = cpsw_get_coalesce,
+ .set_coalesce = cpsw_set_coalesce,
};
static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv,
@@ -1469,6 +1559,9 @@ static int cpsw_probe_dual_emac(struct platform_device *pdev,
priv_sl2->slaves = priv->slaves;
priv_sl2->clk = priv->clk;
+ priv_sl2->coal_intvl = 0;
+ priv_sl2->bus_freq_mhz = clk_get_rate(priv_sl2->clk) / 1000000;
+
priv_sl2->cpsw_res = priv->cpsw_res;
priv_sl2->regs = priv->regs;
priv_sl2->host_port = priv->host_port;
@@ -1578,6 +1671,8 @@ static int cpsw_probe(struct platform_device *pdev)
ret = -ENODEV;
goto clean_slave_ret;
}
+ priv->coal_intvl = 0;
+ priv->bus_freq_mhz = clk_get_rate(priv->clk) / 1000000;
priv->cpsw_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!priv->cpsw_res) {
--
1.7.9.5
--
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