Date:	Wed, 10 Aug 2016 02:22:40 +0300
From:	Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:	netdev@...r.kernel.org, mugunthanvnm@...com,
	grygorii.strashko@...com
Cc:	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	dlide@...com, Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Subject: [PATCH v3 09/13] net: ethernet: ti: cpsw: move cpdma resources to cpsw_common

Every net device private struct holds links to shared cpdma resources.
No need to save and every time synchronize these resources per net dev.
So, move it to common driver struct.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
---
 drivers/net/ethernet/ti/cpsw.c | 97 +++++++++++++++++++++---------------------
 1 file changed, 48 insertions(+), 49 deletions(-)

diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index 5db2a55..6d99d1e 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -369,6 +369,8 @@ struct cpsw_common {
 	struct cpsw_wr_regs __iomem	*wr_regs;
 	u8 __iomem			*hw_stats;
 	struct cpsw_host_regs __iomem	*host_port_regs;
+	struct cpdma_ctlr		*dma;
+	struct cpdma_chan		*txch, *rxch;
 };
 
 struct cpsw_priv {
@@ -384,8 +386,6 @@ struct cpsw_priv {
 	int				rx_packet_max;
 	u8				mac_addr[ETH_ALEN];
 	struct cpsw_slave		*slaves;
-	struct cpdma_ctlr		*dma;
-	struct cpdma_chan		*txch, *rxch;
 	struct cpsw_ale			*ale;
 	bool				rx_pause;
 	bool				tx_pause;
@@ -654,25 +654,21 @@ static void cpsw_ndo_set_rx_mode(struct net_device *ndev)
 	}
 }
 
-static void cpsw_intr_enable(struct cpsw_priv *priv)
+static void cpsw_intr_enable(struct cpsw_common *cpsw)
 {
-	struct cpsw_common *cpsw = priv->cpsw;
-
 	__raw_writel(0xFF, &cpsw->wr_regs->tx_en);
 	__raw_writel(0xFF, &cpsw->wr_regs->rx_en);
 
-	cpdma_ctlr_int_ctrl(priv->dma, true);
+	cpdma_ctlr_int_ctrl(cpsw->dma, true);
 	return;
 }
 
-static void cpsw_intr_disable(struct cpsw_priv *priv)
+static void cpsw_intr_disable(struct cpsw_common *cpsw)
 {
-	struct cpsw_common *cpsw = priv->cpsw;
-
 	__raw_writel(0, &cpsw->wr_regs->tx_en);
 	__raw_writel(0, &cpsw->wr_regs->rx_en);
 
-	cpdma_ctlr_int_ctrl(priv->dma, false);
+	cpdma_ctlr_int_ctrl(cpsw->dma, false);
 	return;
 }
 
@@ -700,6 +696,7 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	struct net_device	*ndev = skb->dev;
 	struct cpsw_priv	*priv = netdev_priv(ndev);
 	int			ret = 0;
+	struct cpsw_common	*cpsw = priv->cpsw;
 
 	cpsw_dual_emac_src_port_detect(status, priv, ndev, skb);
 
@@ -745,8 +742,8 @@ static void cpsw_rx_handler(void *token, int len, int status)
 	}
 
 requeue:
-	ret = cpdma_chan_submit(priv->rxch, new_skb, new_skb->data,
-			skb_tailroom(new_skb), 0);
+	ret = cpdma_chan_submit(cpsw->rxch, new_skb, new_skb->data,
+				skb_tailroom(new_skb), 0);
 	if (WARN_ON(ret < 0))
 		dev_kfree_skb_any(new_skb);
 }
@@ -757,7 +754,7 @@ static irqreturn_t cpsw_tx_interrupt(int irq, void *dev_id)
 	struct cpsw_common *cpsw = priv->cpsw;
 
 	writel(0, &cpsw->wr_regs->tx_en);
-	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_TX);
+	cpdma_ctlr_eoi(cpsw->dma, CPDMA_EOI_TX);
 
 	if (priv->quirk_irq) {
 		disable_irq_nosync(priv->irqs_table[1]);
@@ -773,7 +770,7 @@ static irqreturn_t cpsw_rx_interrupt(int irq, void *dev_id)
 	struct cpsw_priv *priv = dev_id;
 	struct cpsw_common *cpsw = priv->cpsw;
 
-	cpdma_ctlr_eoi(priv->dma, CPDMA_EOI_RX);
+	cpdma_ctlr_eoi(cpsw->dma, CPDMA_EOI_RX);
 	writel(0, &cpsw->wr_regs->rx_en);
 
 	if (priv->quirk_irq) {
@@ -791,7 +788,7 @@ static int cpsw_tx_poll(struct napi_struct *napi_tx, int budget)
 	int			num_tx;
 	struct cpsw_common	*cpsw = priv->cpsw;
 
-	num_tx = cpdma_chan_process(priv->txch, budget);
+	num_tx = cpdma_chan_process(cpsw->txch, budget);
 	if (num_tx < budget) {
 		napi_complete(napi_tx);
 		writel(0xff, &cpsw->wr_regs->tx_en);
@@ -810,7 +807,7 @@ static int cpsw_rx_poll(struct napi_struct *napi_rx, int budget)
 	int			num_rx;
 	struct cpsw_common	*cpsw = priv->cpsw;
 
-	num_rx = cpdma_chan_process(priv->rxch, budget);
+	num_rx = cpdma_chan_process(cpsw->rxch, budget);
 	if (num_rx < budget) {
 		napi_complete(napi_rx);
 		writel(0xff, &cpsw->wr_regs->rx_en);
@@ -1020,17 +1017,16 @@ static void cpsw_get_strings(struct net_device *ndev, u32 stringset, u8 *data)
 static void cpsw_get_ethtool_stats(struct net_device *ndev,
 				    struct ethtool_stats *stats, u64 *data)
 {
-	struct cpsw_priv *priv = netdev_priv(ndev);
 	struct cpdma_chan_stats rx_stats;
 	struct cpdma_chan_stats tx_stats;
 	u32 val;
 	u8 *p;
 	int i;
-	struct cpsw_common *cpsw = priv->cpsw;
+	struct cpsw_common *cpsw = ndev_to_cpsw(ndev);
 
 	/* Collect Davinci CPDMA stats for Rx and Tx Channel */
-	cpdma_chan_get_stats(priv->rxch, &rx_stats);
-	cpdma_chan_get_stats(priv->txch, &tx_stats);
+	cpdma_chan_get_stats(cpsw->rxch, &rx_stats);
+	cpdma_chan_get_stats(cpsw->txch, &tx_stats);
 
 	for (i = 0; i < CPSW_STATS_LEN; i++) {
 		switch (cpsw_gstrings_stats[i].type) {
@@ -1073,7 +1069,9 @@ static int cpsw_common_res_usage_state(struct cpsw_priv *priv)
 static inline int cpsw_tx_packet_submit(struct cpsw_priv *priv,
 					struct sk_buff *skb)
 {
-	return cpdma_chan_submit(priv->txch, skb, skb->data, skb->len,
+	struct cpsw_common *cpsw = priv->cpsw;
+
+	return cpdma_chan_submit(cpsw->txch, skb, skb->data, skb->len,
 				 priv->emac_port + priv->data.dual_emac);
 }
 
@@ -1260,7 +1258,7 @@ static int cpsw_ndo_open(struct net_device *ndev)
 	}
 
 	if (!cpsw_common_res_usage_state(priv))
-		cpsw_intr_disable(priv);
+		cpsw_intr_disable(cpsw);
 	netif_carrier_off(ndev);
 
 	reg = priv->version;
@@ -1286,8 +1284,8 @@ static int cpsw_ndo_open(struct net_device *ndev)
 		int buf_num;
 
 		/* setup tx dma to fixed prio and zero offset */
-		cpdma_control_set(priv->dma, CPDMA_TX_PRIO_FIXED, 1);
-		cpdma_control_set(priv->dma, CPDMA_RX_BUFFER_OFFSET, 0);
+		cpdma_control_set(cpsw->dma, CPDMA_TX_PRIO_FIXED, 1);
+		cpdma_control_set(cpsw->dma, CPDMA_RX_BUFFER_OFFSET, 0);
 
 		/* disable priority elevation */
 		__raw_writel(0, &cpsw->regs->ptype);
@@ -1311,7 +1309,7 @@ static int cpsw_ndo_open(struct net_device *ndev)
 			enable_irq(priv->irqs_table[0]);
 		}
 
-		buf_num = cpdma_chan_get_rx_buf_num(priv->dma);
+		buf_num = cpdma_chan_get_rx_buf_num(cpsw->dma);
 		for (i = 0; i < buf_num; i++) {
 			struct sk_buff *skb;
 
@@ -1320,8 +1318,8 @@ static int cpsw_ndo_open(struct net_device *ndev)
 					priv->rx_packet_max, GFP_KERNEL);
 			if (!skb)
 				goto err_cleanup;
-			ret = cpdma_chan_submit(priv->rxch, skb, skb->data,
-					skb_tailroom(skb), 0);
+			ret = cpdma_chan_submit(cpsw->rxch, skb, skb->data,
+						skb_tailroom(skb), 0);
 			if (ret < 0) {
 				kfree_skb(skb);
 				goto err_cleanup;
@@ -1347,15 +1345,15 @@ static int cpsw_ndo_open(struct net_device *ndev)
 		cpsw_set_coalesce(ndev, &coal);
 	}
 
-	cpdma_ctlr_start(priv->dma);
-	cpsw_intr_enable(priv);
+	cpdma_ctlr_start(cpsw->dma);
+	cpsw_intr_enable(cpsw);
 
 	if (priv->data.dual_emac)
 		priv->slaves[priv->emac_port].open_stat = true;
 	return 0;
 
 err_cleanup:
-	cpdma_ctlr_stop(priv->dma);
+	cpdma_ctlr_stop(cpsw->dma);
 	for_each_slave(priv, cpsw_slave_stop, priv);
 	pm_runtime_put_sync(cpsw->dev);
 	netif_carrier_off(priv->ndev);
@@ -1377,8 +1375,8 @@ static int cpsw_ndo_stop(struct net_device *ndev)
 		napi_disable(&priv_sl0->napi_rx);
 		napi_disable(&priv_sl0->napi_tx);
 		cpts_unregister(priv->cpts);
-		cpsw_intr_disable(priv);
-		cpdma_ctlr_stop(priv->dma);
+		cpsw_intr_disable(cpsw);
+		cpdma_ctlr_stop(cpsw->dma);
 		cpsw_ale_stop(priv->ale);
 	}
 	for_each_slave(priv, cpsw_slave_stop, priv);
@@ -1393,6 +1391,7 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb,
 {
 	struct cpsw_priv *priv = netdev_priv(ndev);
 	int ret;
+	struct cpsw_common *cpsw = priv->cpsw;
 
 	netif_trans_update(ndev);
 
@@ -1417,7 +1416,7 @@ static netdev_tx_t cpsw_ndo_start_xmit(struct sk_buff *skb,
 	/* If there is no more tx desc left free then we need to
 	 * tell the kernel to stop sending us tx frames.
 	 */
-	if (unlikely(!cpdma_check_free_tx_desc(priv->txch)))
+	if (unlikely(!cpdma_check_free_tx_desc(cpsw->txch)))
 		netif_stop_queue(ndev);
 
 	return NETDEV_TX_OK;
@@ -1602,13 +1601,14 @@ static int cpsw_ndo_ioctl(struct net_device *dev, struct ifreq *req, int cmd)
 static void cpsw_ndo_tx_timeout(struct net_device *ndev)
 {
 	struct cpsw_priv *priv = netdev_priv(ndev);
+	struct cpsw_common *cpsw = priv->cpsw;
 
 	cpsw_err(priv, tx_err, "transmit timeout, restarting dma\n");
 	ndev->stats.tx_errors++;
-	cpsw_intr_disable(priv);
-	cpdma_chan_stop(priv->txch);
-	cpdma_chan_start(priv->txch);
-	cpsw_intr_enable(priv);
+	cpsw_intr_disable(cpsw);
+	cpdma_chan_stop(cpsw->txch);
+	cpdma_chan_start(cpsw->txch);
+	cpsw_intr_enable(cpsw);
 }
 
 static int cpsw_ndo_set_mac_address(struct net_device *ndev, void *p)
@@ -1652,11 +1652,12 @@ static int cpsw_ndo_set_mac_address(struct net_device *ndev, void *p)
 static void cpsw_ndo_poll_controller(struct net_device *ndev)
 {
 	struct cpsw_priv *priv = netdev_priv(ndev);
+	struct cpsw_common *cpsw = priv->cpsw;
 
-	cpsw_intr_disable(priv);
+	cpsw_intr_disable(priv->cpsw);
 	cpsw_rx_interrupt(priv->irqs_table[0], priv);
 	cpsw_tx_interrupt(priv->irqs_table[1], priv);
-	cpsw_intr_enable(priv);
+	cpsw_intr_enable(priv->cpsw);
 }
 #endif
 
@@ -2204,9 +2205,6 @@ static int cpsw_probe_dual_emac(struct cpsw_priv *priv)
 	priv_sl2->slaves = priv->slaves;
 	priv_sl2->coal_intvl = 0;
 	priv_sl2->bus_freq_mhz = priv->bus_freq_mhz;
-	priv_sl2->dma = priv->dma;
-	priv_sl2->txch = priv->txch;
-	priv_sl2->rxch = priv->rxch;
 	priv_sl2->ale = priv->ale;
 	priv_sl2->emac_port = 1;
 	priv->slaves[1].ndev = ndev;
@@ -2450,19 +2448,19 @@ static int cpsw_probe(struct platform_device *pdev)
 	dma_params.has_ext_regs		= true;
 	dma_params.desc_hw_addr         = dma_params.desc_mem_phys;
 
-	priv->dma = cpdma_ctlr_create(&dma_params);
-	if (!priv->dma) {
+	cpsw->dma = cpdma_ctlr_create(&dma_params);
+	if (!cpsw->dma) {
 		dev_err(priv->dev, "error initializing dma\n");
 		ret = -ENOMEM;
 		goto clean_runtime_disable_ret;
 	}
 
-	priv->txch = cpdma_chan_create(priv->dma, tx_chan_num(0),
+	cpsw->txch = cpdma_chan_create(cpsw->dma, tx_chan_num(0),
 				       cpsw_tx_handler);
-	priv->rxch = cpdma_chan_create(priv->dma, rx_chan_num(0),
+	cpsw->rxch = cpdma_chan_create(cpsw->dma, rx_chan_num(0),
 				       cpsw_rx_handler);
 
-	if (WARN_ON(!priv->txch || !priv->rxch)) {
+	if (WARN_ON(!cpsw->txch || !cpsw->rxch)) {
 		dev_err(priv->dev, "error initializing dma channels\n");
 		ret = -ENOMEM;
 		goto clean_dma_ret;
@@ -2565,7 +2563,7 @@ static int cpsw_probe(struct platform_device *pdev)
 clean_ale_ret:
 	cpsw_ale_destroy(priv->ale);
 clean_dma_ret:
-	cpdma_ctlr_destroy(priv->dma);
+	cpdma_ctlr_destroy(cpsw->dma);
 clean_runtime_disable_ret:
 	pm_runtime_disable(&pdev->dev);
 clean_ndev_ret:
@@ -2577,6 +2575,7 @@ static int cpsw_remove(struct platform_device *pdev)
 {
 	struct net_device *ndev = platform_get_drvdata(pdev);
 	struct cpsw_priv *priv = netdev_priv(ndev);
+	struct cpsw_common *cpsw = priv->cpsw;
 	int ret;
 
 	ret = pm_runtime_get_sync(&pdev->dev);
@@ -2590,7 +2589,7 @@ static int cpsw_remove(struct platform_device *pdev)
 	unregister_netdev(ndev);
 
 	cpsw_ale_destroy(priv->ale);
-	cpdma_ctlr_destroy(priv->dma);
+	cpdma_ctlr_destroy(cpsw->dma);
 	of_platform_depopulate(&pdev->dev);
 	pm_runtime_put_sync(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
-- 
1.9.1

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