target/linux/sunxi/patches-3.13/153-2-stmmac-add-support-for-optional-reset-control.patch

   1 From c5e4ddbdfa1134a36589c1466ed4abb85fe6f976 Mon Sep 17 00:00:00 2001
   2 From: Chen-Yu Tsai <wens@csie.org>
   3 Date: Fri, 17 Jan 2014 21:24:41 +0800
   4 Subject: [PATCH] net: stmmac: Add support for optional reset control
   5
   6 The DWMAC has a reset assert line, which is used on some SoCs. Add an
   7 optional reset control to stmmac driver core.
   8
   9 To support reset control deferred probing, this patch changes the driver
  10 probe function to return the actual error, instead of just -EINVAL.
  11
  12 Signed-off-by: Chen-Yu Tsai <wens@csie.org>
  13 Signed-off-by: David S. Miller <davem@davemloft.net>
  14 ---
  15  Documentation/devicetree/bindings/net/stmmac.txt      |  3 +++
  16  drivers/net/ethernet/stmicro/stmmac/Kconfig           |  1 +
  17  drivers/net/ethernet/stmicro/stmmac/stmmac.h          |  2 ++
  18  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c     | 19 ++++++++++++++++++-
  19  drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c      |  4 ++--
  20  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c |  4 ++--
  21  6 files changed, 28 insertions(+), 5 deletions(-)
  22
  23 diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
  24 index eba0e5e..d132513 100644
  25 --- a/Documentation/devicetree/bindings/net/stmmac.txt
  26 +++ b/Documentation/devicetree/bindings/net/stmmac.txt
  27 @@ -30,6 +30,9 @@ Required properties:
  28
  29  Optional properties:
  30  - mac-address: 6 bytes, mac address
  31 +- resets: Should contain a phandle to the STMMAC reset signal, if any
  32 +- reset-names: Should contain the reset signal name "stmmaceth", if a
  33 +       reset phandle is given
  34
  35  Examples:
  36
  37 diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
  38 index 6e52c0f..b59d1ef 100644
  39 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
  40 +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
  41 @@ -5,6 +5,7 @@ config STMMAC_ETH
  42         select PHYLIB
  43         select CRC32
  44         select PTP_1588_CLOCK
  45 +       select RESET_CONTROLLER
  46         ---help---
  47           This is the driver for the Ethernet IPs are built around a
  48           Synopsys IP Core and only tested on the STMicroelectronics
  49 diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
  50 index 73709e9..c1c141f 100644
  51 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
  52 +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
  53 @@ -32,6 +32,7 @@
  54  #include <linux/pci.h>
  55  #include "common.h"
  56  #include <linux/ptp_clock_kernel.h>
  57 +#include <linux/reset.h>
  58
  59  struct stmmac_priv {
  60         /* Frequently used values are kept adjacent for cache effect */
  61 @@ -91,6 +92,7 @@ struct stmmac_priv {
  62         int wolopts;
  63         int wol_irq;
  64         struct clk *stmmac_clk;
  65 +       struct reset_control *stmmac_rst;
  66         int clk_csr;
  67         struct timer_list eee_ctrl_timer;
  68         int lpi_irq;
  69 diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
  70 index 0d2c4cb..0c5c120 100644
  71 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
  72 +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
  73 @@ -51,6 +51,7 @@
  74  #include <linux/net_tstamp.h>
  75  #include "stmmac_ptp.h"
  76  #include "stmmac.h"
  77 +#include <linux/reset.h>
  78
  79  #define STMMAC_ALIGN(x)        L1_CACHE_ALIGN(x)
  80  #define JUMBO_LEN      9000
  81 @@ -2728,10 +2729,24 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
  82         if (IS_ERR(priv->stmmac_clk)) {
  83                 dev_warn(priv->device, "%s: warning: cannot get CSR clock\n",
  84                          __func__);
  85 +               ret = PTR_ERR(priv->stmmac_clk);
  86                 goto error_clk_get;
  87         }
  88         clk_prepare_enable(priv->stmmac_clk);
  89
  90 +       priv->stmmac_rst = devm_reset_control_get(priv->device,
  91 +                                                 STMMAC_RESOURCE_NAME);
  92 +       if (IS_ERR(priv->stmmac_rst)) {
  93 +               if (PTR_ERR(priv->stmmac_rst) == -EPROBE_DEFER) {
  94 +                       ret = -EPROBE_DEFER;
  95 +                       goto error_hw_init;
  96 +               }
  97 +               dev_info(priv->device, "no reset control found\n");
  98 +               priv->stmmac_rst = NULL;
  99 +       }
 100 +       if (priv->stmmac_rst)
 101 +               reset_control_deassert(priv->stmmac_rst);
 102 +
 103         /* Init MAC and get the capabilities */
 104         ret = stmmac_hw_init(priv);
 105         if (ret)
 106 @@ -2808,7 +2823,7 @@ struct stmmac_priv *stmmac_dvr_probe(struct device *device,
 107  error_clk_get:
 108         free_netdev(ndev);
 109
 110 -       return NULL;
 111 +       return ERR_PTR(ret);
 112  }
 113
 114  /**
 115 @@ -2832,6 +2847,8 @@ int stmmac_dvr_remove(struct net_device *ndev)
 116                 stmmac_mdio_unregister(ndev);
 117         netif_carrier_off(ndev);
 118         unregister_netdev(ndev);
 119 +       if (priv->stmmac_rst)
 120 +               reset_control_assert(priv->stmmac_rst);
 121         clk_disable_unprepare(priv->stmmac_clk);
 122         free_netdev(ndev);
 123
 124 diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
 125 index 37ba2e0..2916089 100644
 126 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
 127 +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
 128 @@ -100,9 +100,9 @@ static int stmmac_pci_probe(struct pci_dev *pdev,
 129         stmmac_default_data();
 130
 131         priv = stmmac_dvr_probe(&(pdev->dev), &plat_dat, addr);
 132 -       if (!priv) {
 133 +       if (IS_ERR(priv)) {
 134                 pr_err("%s: main driver probe failed", __func__);
 135 -               ret = -ENODEV;
 136 +               ret = PTR_ERR(priv);
 137                 goto err_out;
 138         }
 139         priv->dev->irq = pdev->irq;
 140 diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
 141 index 6d0bf22..cc6b89a7 100644
 142 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
 143 +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
 144 @@ -152,9 +152,9 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
 145         }
 146
 147         priv = stmmac_dvr_probe(&(pdev->dev), plat_dat, addr);
 148 -       if (!priv) {
 149 +       if (IS_ERR(priv)) {
 150                 pr_err("%s: main driver probe failed", __func__);
 151 -               return -ENODEV;
 152 +               return PTR_ERR(priv);
 153         }
 154
 155         /* Get MAC address if available (DT) */
 156 --
 157 1.8.5.5
 158