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Date: Sat, 16 Feb 2013 11:26:38 +0900
From: Simon Horman <horms@...ge.net.au>
To: Nobuhiro Iwamatsu <iwamatsu@...auri.org>
Cc: netdev@...r.kernel.org, horms+renesas@...ge.net.au,
magnus.damm@...il.com, devicetree-discuss@...ts.ozlabs.org,
kda@...ux-powerpc.org, kuninori.morimoto.gx@...esas.com,
Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
Subject: Re: [PATCH v4] net: sh_eth: Add support of device tree probe
On Fri, Feb 15, 2013 at 10:53:25AM +0900, Nobuhiro Iwamatsu wrote:
> From: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
>
> This adds support of device tree probe for Renesas sh-ether driver.
Hi Iwamatsu-san,
I do not expect this code to go through the renesas tree. However, in
order to provide a basis for work on renesas SoCs I have added this patch
to the topic/sh_eth topic branch in the reneas tree on kernel.org and
merged it into topic/all+next.
In other words, I am not picking this patch up to merge it or add it to
linux-next, rather I am storing it for reference.
Also, I do note that there have already been some comments made on this
patch and I plan to date topic/sh_eth topic branch as new versions are
posted.
> Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
>
> V4: - Remove empty sh_eth_parse_dt().
> V3: - Removed sentnece of "needs-init" from document.
> V2: - Removed ether_setup().
> - Fixed typo from "sh-etn" to "sh-eth".
> - Removed "needs-init" and sh-eth,endian from definition of DT.
> - Changed "sh-eth,edmac-endian" instead of "sh-eth,edmac-big-endain"
> in definition of DT.
> ---
> Documentation/devicetree/bindings/net/sh_ether.txt | 39 +++++
> drivers/net/ethernet/renesas/sh_eth.c | 150 ++++++++++++++++----
> 2 files changed, 165 insertions(+), 24 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/net/sh_ether.txt
>
> diff --git a/Documentation/devicetree/bindings/net/sh_ether.txt b/Documentation/devicetree/bindings/net/sh_ether.txt
> new file mode 100644
> index 0000000..f20d66a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/sh_ether.txt
> @@ -0,0 +1,39 @@
> +* Renesas Electronics SuperH EMAC
> +
> +This file provides information, what the device node
> +for the sh_eth interface contains.
> +
> +Required properties:
> +- compatible: "renesas,sh-eth";
> +- interrupt-parent: The phandle for the interrupt controller that
> + services interrupts for this device.
> +- reg: Offset and length of the register set for the
> + device.
> +- interrupts: Interrupt mapping for the sh_eth interrupt
> + sources (vector id).
> +- phy-mode: String, operation mode of the PHY interface.
> +- sh-eth,register-type: String, register type of sh_eth.
> + Please select "gigabit", "fast-sh4" or
> + "fast-sh3-sh2".
> +- sh-eth,phy-id: PHY id.
> +
> +Optional properties:
> +- local-mac-address: 6 bytes, mac address
> +- sh-eth,no-ether-link: Set link control by software. When device does
> + not support ether-link, set.
> +- sh-eth,ether-link-active-low: Set link check method.
> + When detection of link is treated as active-low,
> + set.
> +- sh-eth,edmac-big-endian: Set big endian for sh_eth dmac.
> + It work as little endian when this is not set.
> +
> +Example (armadillo800eva):
> + sh-eth@...00000 {
> + compatible = "renesas,sh-eth";
> + interrupt-parent = <&intca>;
> + reg = <0xe9a00000 0x800>, <0xe9a01800 0x800>;
> + interrupts = <0x500>;
> + phy-mode = "mii";
> + sh-eth,register-type = "gigabit";
> + sh-eth,phy-id = <0>;
> + };
> diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
> index 3d70586..b41249a 100644
> --- a/drivers/net/ethernet/renesas/sh_eth.c
> +++ b/drivers/net/ethernet/renesas/sh_eth.c
> @@ -1,7 +1,7 @@
> /*
> * SuperH Ethernet device driver
> *
> - * Copyright (C) 2006-2012 Nobuhiro Iwamatsu
> + * Copyright (C) 2006-2013 Nobuhiro Iwamatsu
> * Copyright (C) 2008-2012 Renesas Solutions Corp.
> *
> * This program is free software; you can redistribute it and/or modify it
> @@ -31,6 +31,12 @@
> #include <linux/platform_device.h>
> #include <linux/mdio-bitbang.h>
> #include <linux/netdevice.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_net.h>
> #include <linux/phy.h>
> #include <linux/cache.h>
> #include <linux/io.h>
> @@ -2347,26 +2353,103 @@ static const struct net_device_ops sh_eth_netdev_ops = {
> .ndo_change_mtu = eth_change_mtu,
> };
>
> +#ifdef CONFIG_OF
> +
> +static int
> +sh_eth_of_get_register_type(struct device_node *np)
> +{
> + const char *of_str;
> + int ret = of_property_read_string(np, "sh-eth,register-type", &of_str);
> + if (ret)
> + return ret;
> +
> + if (of_str && !strcmp(of_str, "gigabit"))
> + return SH_ETH_REG_GIGABIT;
> +
> + else if (of_str && !strcmp(of_str, "fast-sh4"))
> + return SH_ETH_REG_FAST_SH4;
> + else if (of_str && !strcmp(of_str, "fast-sh3-sh2"))
> + return SH_ETH_REG_FAST_SH3_SH2;
> + else
> + return -EINVAL;
> +}
> +
> +static struct sh_eth_plat_data *
> +sh_eth_parse_dt(struct device *dev, struct net_device *ndev)
> +{
> + int ret;
> + struct device_node *np = dev->of_node;
> + struct sh_eth_plat_data *pdata;
> +
> + pdata = devm_kzalloc(dev, sizeof(struct sh_eth_plat_data),
> + GFP_KERNEL);
> + if (!pdata) {
> + dev_err(dev, "%s: failed to allocate config data\n", __func__);
> + return NULL;
> + }
> +
> + pdata->phy_interface = of_get_phy_mode(np);
> +
> + of_property_read_u32(np, "sh-eth,phy-id", &pdata->phy);
> +
> + if (of_find_property(np, "sh-eth,edmac-big-endian", NULL))
> + pdata->edmac_endian = EDMAC_BIG_ENDIAN;
> + else
> + pdata->edmac_endian = EDMAC_LITTLE_ENDIAN;
> +
> + if (of_find_property(np, "sh-eth,no-ether-link", NULL))
> + pdata->no_ether_link = 1;
> + else
> + pdata->no_ether_link = 0;
> +
> + if (of_find_property(np, "sh-eth,ether-link-active-low", NULL))
> + pdata->ether_link_active_low = 1;
> + else
> + pdata->ether_link_active_low = 0;
> +
> + ret = sh_eth_of_get_register_type(np);
> + if (ret < 0)
> + goto error;
> + pdata->register_type = ret;
> +
> +#ifdef CONFIG_OF_NET
> + if (!is_valid_ether_addr(ndev->dev_addr)) {
> + const char *macaddr = of_get_mac_address(np);
> + if (macaddr)
> + memcpy(pdata->mac_addr, macaddr, ETH_ALEN);
> + }
> +#endif
> +
> + return pdata;
> +
> +error:
> + devm_kfree(dev, pdata);
> + return NULL;
> +}
> +#endif
> +
> static int sh_eth_drv_probe(struct platform_device *pdev)
> {
> - int ret, devno = 0;
> + int ret = 0, devno = 0;
> struct resource *res;
> struct net_device *ndev = NULL;
> struct sh_eth_private *mdp = NULL;
> struct sh_eth_plat_data *pd;
> + struct device_node *np = pdev->dev.of_node;
> +
> + ndev = alloc_etherdev(sizeof(struct sh_eth_private));
> + if (!ndev) {
> + ret = -ENOMEM;
> + goto out;
> + }
>
> + mdp = netdev_priv(ndev);
> /* get base addr */
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (unlikely(res == NULL)) {
> dev_err(&pdev->dev, "invalid resource\n");
> ret = -EINVAL;
> - goto out;
> - }
> -
> - ndev = alloc_etherdev(sizeof(struct sh_eth_private));
> - if (!ndev) {
> - ret = -ENOMEM;
> - goto out;
> + goto out_release;
> }
>
> /* The sh Ether-specific entries in the device structure. */
> @@ -2383,27 +2466,41 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
> }
> ndev->irq = ret;
>
> - SET_NETDEV_DEV(ndev, &pdev->dev);
> -
> - /* Fill in the fields of the device structure with ethernet values. */
> - ether_setup(ndev);
> -
> - mdp = netdev_priv(ndev);
> - mdp->num_tx_ring = TX_RING_SIZE;
> - mdp->num_rx_ring = RX_RING_SIZE;
> mdp->addr = ioremap(res->start, resource_size(res));
> if (mdp->addr == NULL) {
> ret = -ENOMEM;
> dev_err(&pdev->dev, "ioremap failed.\n");
> goto out_release;
> }
> +#ifdef CONFIG_OF
> + if (np && of_device_is_available(np)) {
> + pd = sh_eth_parse_dt(&pdev->dev, ndev);
> + if (pdev->dev.platform_data) {
> + struct sh_eth_plat_data *tmp =
> + pdev->dev.platform_data;
> + pd->set_mdio_gate = tmp->set_mdio_gate;
> + pd->needs_init = tmp->needs_init;
> + }
> + } else
> +#endif
> + pd = (struct sh_eth_plat_data *)(pdev->dev.platform_data);
> +
> + if (!pd) {
> + dev_err(&pdev->dev, "no setup data defined\n");
> + ret = -EINVAL;
> + goto out_release;
> + }
> +
> + SET_NETDEV_DEV(ndev, &pdev->dev);
> +
> + mdp->num_tx_ring = TX_RING_SIZE;
> + mdp->num_rx_ring = RX_RING_SIZE;
>
> spin_lock_init(&mdp->lock);
> mdp->pdev = pdev;
> pm_runtime_enable(&pdev->dev);
> pm_runtime_resume(&pdev->dev);
>
> - pd = (struct sh_eth_plat_data *)(pdev->dev.platform_data);
> /* get PHY ID */
> mdp->phy_id = pd->phy;
> mdp->phy_interface = pd->phy_interface;
> @@ -2412,6 +2509,8 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
> mdp->no_ether_link = pd->no_ether_link;
> mdp->ether_link_active_low = pd->ether_link_active_low;
> mdp->reg_offset = sh_eth_get_register_offset(pd->register_type);
> + /* read and set MAC address */
> + read_mac_address(ndev, pd->mac_addr);
>
> /* set cpu data */
> #if defined(SH_ETH_HAS_BOTH_MODULES)
> @@ -2429,20 +2528,16 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
> /* debug message level */
> mdp->msg_enable = SH_ETH_DEF_MSG_ENABLE;
>
> - /* read and set MAC address */
> - read_mac_address(ndev, pd->mac_addr);
> -
> /* ioremap the TSU registers */
> if (mdp->cd->tsu) {
> struct resource *rtsu;
> rtsu = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> if (!rtsu) {
> dev_err(&pdev->dev, "Not found TSU resource\n");
> - ret = -ENODEV;
> goto out_release;
> }
> mdp->tsu_addr = ioremap(rtsu->start,
> - resource_size(rtsu));
> + resource_size(rtsu));
> mdp->port = devno % 2;
> ndev->features = NETIF_F_HW_VLAN_FILTER;
> }
> @@ -2522,17 +2617,24 @@ static int sh_eth_runtime_nop(struct device *dev)
> return 0;
> }
>
> -static struct dev_pm_ops sh_eth_dev_pm_ops = {
> +static const struct dev_pm_ops sh_eth_dev_pm_ops = {
> .runtime_suspend = sh_eth_runtime_nop,
> .runtime_resume = sh_eth_runtime_nop,
> };
>
> +static struct of_device_id sh_eth_match[] = {
> + { .compatible = "renesas,sh-eth",},
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, sh_eth_match);
> +
> static struct platform_driver sh_eth_driver = {
> .probe = sh_eth_drv_probe,
> .remove = sh_eth_drv_remove,
> .driver = {
> .name = CARDNAME,
> .pm = &sh_eth_dev_pm_ops,
> + .of_match_table = sh_eth_match,
> },
> };
>
> --
> 1.7.10.4
>
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