From 9c86b846ce02f7e35d7234cf090b80553eba5389 Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 1 Oct 2017 13:02:15 +0200 Subject: [PATCH 1/6] bcm63xx_enet: correct clock usage Check the return code of prepare_enable and change one last instance of enable only to prepare_enable. Also properly disable and release the clock in error paths and on remove for enetsw. Signed-off-by: Jonas Gorski Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcm63xx_enet.c | 33 ++++++++++++++------ 1 file changed, 24 insertions(+), 9 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c index c6221f04a748..a45ec97b5b1e 100644 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c @@ -1773,7 +1773,9 @@ static int bcm_enet_probe(struct platform_device *pdev) ret = PTR_ERR(priv->mac_clk); goto out; } - clk_prepare_enable(priv->mac_clk); + ret = clk_prepare_enable(priv->mac_clk); + if (ret) + goto out_put_clk_mac; /* initialize default and fetch platform data */ priv->rx_ring_size = BCMENET_DEF_RX_DESC; @@ -1805,9 +1807,11 @@ static int bcm_enet_probe(struct platform_device *pdev) if (IS_ERR(priv->phy_clk)) { ret = PTR_ERR(priv->phy_clk); priv->phy_clk = NULL; - goto out_put_clk_mac; + goto out_disable_clk_mac; } - clk_prepare_enable(priv->phy_clk); + ret = clk_prepare_enable(priv->phy_clk); + if (ret) + goto out_put_clk_phy; } /* do minimal hardware init to be able to probe mii bus */ @@ -1900,13 +1904,16 @@ static int bcm_enet_probe(struct platform_device *pdev) out_uninit_hw: /* turn off mdc clock */ enet_writel(priv, 0, ENET_MIISC_REG); - if (priv->phy_clk) { + if (priv->phy_clk) clk_disable_unprepare(priv->phy_clk); - clk_put(priv->phy_clk); - } -out_put_clk_mac: +out_put_clk_phy: + if (priv->phy_clk) + clk_put(priv->phy_clk); + +out_disable_clk_mac: clk_disable_unprepare(priv->mac_clk); +out_put_clk_mac: clk_put(priv->mac_clk); out: free_netdev(dev); @@ -2748,7 +2755,9 @@ static int bcm_enetsw_probe(struct platform_device *pdev) ret = PTR_ERR(priv->mac_clk); goto out_unmap; } - clk_enable(priv->mac_clk); + ret = clk_prepare_enable(priv->mac_clk); + if (ret) + goto out_put_clk; priv->rx_chan = 0; priv->tx_chan = 1; @@ -2769,7 +2778,7 @@ static int bcm_enetsw_probe(struct platform_device *pdev) ret = register_netdev(dev); if (ret) - goto out_put_clk; + goto out_disable_clk; netif_carrier_off(dev); platform_set_drvdata(pdev, dev); @@ -2778,6 +2787,9 @@ static int bcm_enetsw_probe(struct platform_device *pdev) return 0; +out_disable_clk: + clk_disable_unprepare(priv->mac_clk); + out_put_clk: clk_put(priv->mac_clk); @@ -2809,6 +2821,9 @@ static int bcm_enetsw_remove(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(res->start, resource_size(res)); + clk_disable_unprepare(priv->mac_clk); + clk_put(priv->mac_clk); + free_netdev(dev); return 0; } From d6213c1f2ad54a964b77471690264ed685718928 Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 1 Oct 2017 13:02:16 +0200 Subject: [PATCH 2/6] bcm63xx_enet: do not write to random DMA channel on BCM6345 The DMA controller regs actually point to DMA channel 0, so the write to ENETDMA_CFG_REG will actually modify a random DMA channel. Since DMA controller registers do not exist on BCM6345, guard the write with the usual check for dma_has_sram. Signed-off-by: Jonas Gorski Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcm63xx_enet.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c index a45ec97b5b1e..a1e1e12e187a 100644 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c @@ -1062,7 +1062,8 @@ static int bcm_enet_open(struct net_device *dev) val = enet_readl(priv, ENET_CTL_REG); val |= ENET_CTL_ENABLE_MASK; enet_writel(priv, val, ENET_CTL_REG); - enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG); + if (priv->dma_has_sram) + enet_dma_writel(priv, ENETDMA_CFG_EN_MASK, ENETDMA_CFG_REG); enet_dmac_writel(priv, priv->dma_chan_en_mask, ENETDMAC_CHANCFG, priv->rx_chan); From 527a48713b01057d94aeec8f4383b1e20c82522c Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 1 Oct 2017 13:02:17 +0200 Subject: [PATCH 3/6] bcm63xx_enet: do not rely on probe order Do not rely on the shared device being probed before the enet(sw) devices. This makes it easier to eventually move out the shared device as a dma controller driver (what it should be). Signed-off-by: Jonas Gorski Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcm63xx_enet.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c index a1e1e12e187a..8caf6abab3a6 100644 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c @@ -1722,10 +1722,8 @@ static int bcm_enet_probe(struct platform_device *pdev) const char *clk_name; int i, ret; - /* stop if shared driver failed, assume driver->probe will be - * called in the same order we register devices (correct ?) */ if (!bcm_enet_shared_base[0]) - return -ENODEV; + return -EPROBE_DEFER; res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); res_irq_rx = platform_get_resource(pdev, IORESOURCE_IRQ, 1); @@ -2696,11 +2694,8 @@ static int bcm_enetsw_probe(struct platform_device *pdev) struct resource *res_mem; int ret, irq_rx, irq_tx; - /* stop if shared driver failed, assume driver->probe will be - * called in the same order we register devices (correct ?) - */ if (!bcm_enet_shared_base[0]) - return -ENODEV; + return -EPROBE_DEFER; res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq_rx = platform_get_irq(pdev, 0); From 7e697ce99ceb09538cdc1dfa9ebb3db60236b0a7 Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 1 Oct 2017 13:02:18 +0200 Subject: [PATCH 4/6] bcm63xx_enet: use managed functions for clock/ioremap Use managed functions where possible to reduce the amount of resource handling on error and remove paths. Signed-off-by: Jonas Gorski Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcm63xx_enet.c | 54 +++++--------------- 1 file changed, 12 insertions(+), 42 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c index 8caf6abab3a6..059ef4f1d137 100644 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c @@ -1767,14 +1767,14 @@ static int bcm_enet_probe(struct platform_device *pdev) clk_name = "enet1"; } - priv->mac_clk = clk_get(&pdev->dev, clk_name); + priv->mac_clk = devm_clk_get(&pdev->dev, clk_name); if (IS_ERR(priv->mac_clk)) { ret = PTR_ERR(priv->mac_clk); goto out; } ret = clk_prepare_enable(priv->mac_clk); if (ret) - goto out_put_clk_mac; + goto out; /* initialize default and fetch platform data */ priv->rx_ring_size = BCMENET_DEF_RX_DESC; @@ -1802,7 +1802,7 @@ static int bcm_enet_probe(struct platform_device *pdev) if (priv->mac_id == 0 && priv->has_phy && !priv->use_external_mii) { /* using internal PHY, enable clock */ - priv->phy_clk = clk_get(&pdev->dev, "ephy"); + priv->phy_clk = devm_clk_get(&pdev->dev, "ephy"); if (IS_ERR(priv->phy_clk)) { ret = PTR_ERR(priv->phy_clk); priv->phy_clk = NULL; @@ -1810,7 +1810,7 @@ static int bcm_enet_probe(struct platform_device *pdev) } ret = clk_prepare_enable(priv->phy_clk); if (ret) - goto out_put_clk_phy; + goto out_disable_clk_mac; } /* do minimal hardware init to be able to probe mii bus */ @@ -1906,14 +1906,8 @@ static int bcm_enet_probe(struct platform_device *pdev) if (priv->phy_clk) clk_disable_unprepare(priv->phy_clk); -out_put_clk_phy: - if (priv->phy_clk) - clk_put(priv->phy_clk); - out_disable_clk_mac: clk_disable_unprepare(priv->mac_clk); -out_put_clk_mac: - clk_put(priv->mac_clk); out: free_netdev(dev); return ret; @@ -1949,12 +1943,10 @@ static int bcm_enet_remove(struct platform_device *pdev) } /* disable hw block clocks */ - if (priv->phy_clk) { + if (priv->phy_clk) clk_disable_unprepare(priv->phy_clk); - clk_put(priv->phy_clk); - } + clk_disable_unprepare(priv->mac_clk); - clk_put(priv->mac_clk); free_netdev(dev); return 0; @@ -2734,26 +2726,20 @@ static int bcm_enetsw_probe(struct platform_device *pdev) if (ret) goto out; - if (!request_mem_region(res_mem->start, resource_size(res_mem), - "bcm63xx_enetsw")) { - ret = -EBUSY; + priv->base = devm_ioremap_resource(&pdev->dev, res_mem); + if (IS_ERR(priv->base)) { + ret = PTR_ERR(priv->base); goto out; } - priv->base = ioremap(res_mem->start, resource_size(res_mem)); - if (priv->base == NULL) { - ret = -ENOMEM; - goto out_release_mem; - } - - priv->mac_clk = clk_get(&pdev->dev, "enetsw"); + priv->mac_clk = devm_clk_get(&pdev->dev, "enetsw"); if (IS_ERR(priv->mac_clk)) { ret = PTR_ERR(priv->mac_clk); - goto out_unmap; + goto out; } ret = clk_prepare_enable(priv->mac_clk); if (ret) - goto out_put_clk; + goto out; priv->rx_chan = 0; priv->tx_chan = 1; @@ -2785,15 +2771,6 @@ static int bcm_enetsw_probe(struct platform_device *pdev) out_disable_clk: clk_disable_unprepare(priv->mac_clk); - -out_put_clk: - clk_put(priv->mac_clk); - -out_unmap: - iounmap(priv->base); - -out_release_mem: - release_mem_region(res_mem->start, resource_size(res_mem)); out: free_netdev(dev); return ret; @@ -2805,20 +2782,13 @@ static int bcm_enetsw_remove(struct platform_device *pdev) { struct bcm_enet_priv *priv; struct net_device *dev; - struct resource *res; /* stop netdevice */ dev = platform_get_drvdata(pdev); priv = netdev_priv(dev); unregister_netdev(dev); - /* release device resources */ - iounmap(priv->base); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - release_mem_region(res->start, resource_size(res)); - clk_disable_unprepare(priv->mac_clk); - clk_put(priv->mac_clk); free_netdev(dev); return 0; From 4e78e5c5d881bf2d6267545a554c1baf245257b7 Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 1 Oct 2017 13:02:19 +0200 Subject: [PATCH 5/6] bcm63xx_enet: drop unneeded NULL phy_clk check clk_disable and clk_unprepare are NULL-safe, so need to duplicate the NULL check of the functions. Signed-off-by: Jonas Gorski Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcm63xx_enet.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.c b/drivers/net/ethernet/broadcom/bcm63xx_enet.c index 059ef4f1d137..f6bc13fe8a99 100644 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.c +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.c @@ -1903,8 +1903,7 @@ static int bcm_enet_probe(struct platform_device *pdev) out_uninit_hw: /* turn off mdc clock */ enet_writel(priv, 0, ENET_MIISC_REG); - if (priv->phy_clk) - clk_disable_unprepare(priv->phy_clk); + clk_disable_unprepare(priv->phy_clk); out_disable_clk_mac: clk_disable_unprepare(priv->mac_clk); @@ -1943,9 +1942,7 @@ static int bcm_enet_remove(struct platform_device *pdev) } /* disable hw block clocks */ - if (priv->phy_clk) - clk_disable_unprepare(priv->phy_clk); - + clk_disable_unprepare(priv->phy_clk); clk_disable_unprepare(priv->mac_clk); free_netdev(dev); From 840f922317fb5c20841d6d7f3853ead506546ade Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 1 Oct 2017 13:02:20 +0200 Subject: [PATCH 6/6] bcm63xx_enet: remove unneeded include We don't use anyhing from that file, so drop it. Signed-off-by: Jonas Gorski Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bcm63xx_enet.h | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/bcm63xx_enet.h b/drivers/net/ethernet/broadcom/bcm63xx_enet.h index 0a1b7b2e55bd..dd6ae3077433 100644 --- a/drivers/net/ethernet/broadcom/bcm63xx_enet.h +++ b/drivers/net/ethernet/broadcom/bcm63xx_enet.h @@ -8,7 +8,6 @@ #include #include -#include #include #include