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Date: Wed, 18 Mar 2009 23:06:48 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: linuxppc-dev@...abs.org, netdev@...r.kernel.org,
afleming@...escale.com, avorontsov@...mvista.com,
davem@...emloft.net, galak@...nel.crashing.org
Subject: Re: [PATCH 5/9] net: make mpc5200 fec driver use of_mdio
infrastructure
RFC, please don't apply yet.
On Wed, Mar 18, 2009 at 11:00 PM, Grant Likely
<grant.likely@...retlab.ca> wrote:
> From: Grant Likely <grant.likely@...retlab.ca>
>
> The patch reworks the MPC5200 Fast Ethernet Controller (FEC) driver to
> use the of_mdio infrastructure for registering PHY devices from data out
> openfirmware device tree, and eliminates the assumption that the PHY
> for the FEC is always attached to the FEC's own MDIO bus. With this
> patch, the FEC can use a PHY attached to any MDIO bus if it is described
> in the device tree.
> ---
>
> drivers/net/Kconfig | 2
> drivers/net/fec_mpc52xx.c | 175 +++++++++++------------------------------
> drivers/net/fec_mpc52xx_phy.c | 26 +-----
> 3 files changed, 53 insertions(+), 150 deletions(-)
>
>
> diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
> index a2f185f..3aa24f6 100644
> --- a/drivers/net/Kconfig
> +++ b/drivers/net/Kconfig
> @@ -1854,7 +1854,7 @@ config FEC_MPC52xx
>
> config FEC_MPC52xx_MDIO
> bool "MPC52xx FEC MDIO bus driver"
> - depends on FEC_MPC52xx
> + depends on FEC_MPC52xx && OF_MDIO
> default y
> ---help---
> The MPC5200's FEC can connect to the Ethernet either with
> diff --git a/drivers/net/fec_mpc52xx.c b/drivers/net/fec_mpc52xx.c
> index 3d55f9a..12ab8ae 100644
> --- a/drivers/net/fec_mpc52xx.c
> +++ b/drivers/net/fec_mpc52xx.c
> @@ -25,6 +25,7 @@
> #include <linux/hardirq.h>
> #include <linux/delay.h>
> #include <linux/of_device.h>
> +#include <linux/of_mdio.h>
> #include <linux/of_platform.h>
>
> #include <linux/netdevice.h>
> @@ -43,11 +44,9 @@
>
> #define DRIVER_NAME "mpc52xx-fec"
>
> -#define FEC5200_PHYADDR_NONE (-1)
> -#define FEC5200_PHYADDR_7WIRE (-2)
> -
> /* Private driver data structure */
> struct mpc52xx_fec_priv {
> + struct net_device *ndev;
> int duplex;
> int speed;
> int r_irq;
> @@ -59,10 +58,11 @@ struct mpc52xx_fec_priv {
> int msg_enable;
>
> /* MDIO link details */
> - int phy_addr;
> - unsigned int phy_speed;
> + unsigned int mdio_speed;
> + struct device_node *phy_node;
> struct phy_device *phydev;
> enum phy_state link;
> + int seven_wire_mode;
> };
>
>
> @@ -210,66 +210,6 @@ static void mpc52xx_fec_adjust_link(struct net_device *dev)
> phy_print_status(phydev);
> }
>
> -static int mpc52xx_fec_init_phy(struct net_device *dev)
> -{
> - struct mpc52xx_fec_priv *priv = netdev_priv(dev);
> - struct phy_device *phydev;
> - char phy_id[BUS_ID_SIZE];
> -
> - snprintf(phy_id, sizeof(phy_id), "%x:%02x",
> - (unsigned int)dev->base_addr, priv->phy_addr);
> -
> - priv->link = PHY_DOWN;
> - priv->speed = 0;
> - priv->duplex = -1;
> -
> - phydev = phy_connect(dev, phy_id, &mpc52xx_fec_adjust_link, 0, PHY_INTERFACE_MODE_MII);
> - if (IS_ERR(phydev)) {
> - dev_err(&dev->dev, "phy_connect failed\n");
> - return PTR_ERR(phydev);
> - }
> - dev_info(&dev->dev, "attached phy %i to driver %s\n",
> - phydev->addr, phydev->drv->name);
> -
> - priv->phydev = phydev;
> -
> - return 0;
> -}
> -
> -static int mpc52xx_fec_phy_start(struct net_device *dev)
> -{
> - struct mpc52xx_fec_priv *priv = netdev_priv(dev);
> - int err;
> -
> - if (priv->phy_addr < 0)
> - return 0;
> -
> - err = mpc52xx_fec_init_phy(dev);
> - if (err) {
> - dev_err(&dev->dev, "mpc52xx_fec_init_phy failed\n");
> - return err;
> - }
> -
> - /* reset phy - this also wakes it from PDOWN */
> - phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
> - phy_start(priv->phydev);
> -
> - return 0;
> -}
> -
> -static void mpc52xx_fec_phy_stop(struct net_device *dev)
> -{
> - struct mpc52xx_fec_priv *priv = netdev_priv(dev);
> -
> - if (!priv->phydev)
> - return;
> -
> - phy_disconnect(priv->phydev);
> - /* power down phy */
> - phy_stop(priv->phydev);
> - phy_write(priv->phydev, MII_BMCR, BMCR_PDOWN);
> -}
> -
> static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
> struct mii_ioctl_data *mii_data, int cmd)
> {
> @@ -279,25 +219,25 @@ static int mpc52xx_fec_phy_mii_ioctl(struct mpc52xx_fec_priv *priv,
> return phy_mii_ioctl(priv->phydev, mii_data, cmd);
> }
>
> -static void mpc52xx_fec_phy_hw_init(struct mpc52xx_fec_priv *priv)
> -{
> - struct mpc52xx_fec __iomem *fec = priv->fec;
> -
> - if (priv->phydev)
> - return;
> -
> - out_be32(&fec->mii_speed, priv->phy_speed);
> -}
> -
> static int mpc52xx_fec_open(struct net_device *dev)
> {
> struct mpc52xx_fec_priv *priv = netdev_priv(dev);
> int err = -EBUSY;
>
> + if (priv->phy_node) {
> + priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
> + mpc52xx_fec_adjust_link, 0, 0);
> + if (!priv->phydev) {
> + dev_err(&dev->dev, "of_phy_connect failed\n");
> + return -ENODEV;
> + }
> + phy_start(priv->phydev);
> + }
> +
> if (request_irq(dev->irq, &mpc52xx_fec_interrupt, IRQF_SHARED,
> DRIVER_NAME "_ctrl", dev)) {
> dev_err(&dev->dev, "ctrl interrupt request failed\n");
> - goto out;
> + goto free_phy;
> }
> if (request_irq(priv->r_irq, &mpc52xx_fec_rx_interrupt, 0,
> DRIVER_NAME "_rx", dev)) {
> @@ -319,10 +259,6 @@ static int mpc52xx_fec_open(struct net_device *dev)
> goto free_irqs;
> }
>
> - err = mpc52xx_fec_phy_start(dev);
> - if (err)
> - goto free_skbs;
> -
> bcom_enable(priv->rx_dmatsk);
> bcom_enable(priv->tx_dmatsk);
>
> @@ -332,16 +268,18 @@ static int mpc52xx_fec_open(struct net_device *dev)
>
> return 0;
>
> - free_skbs:
> - mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);
> -
> free_irqs:
> free_irq(priv->t_irq, dev);
> free_2irqs:
> free_irq(priv->r_irq, dev);
> free_ctrl_irq:
> free_irq(dev->irq, dev);
> - out:
> + free_phy:
> + if (priv->phydev) {
> + phy_stop(priv->phydev);
> + phy_disconnect(priv->phydev);
> + priv->phydev = NULL;
> + }
>
> return err;
> }
> @@ -360,7 +298,12 @@ static int mpc52xx_fec_close(struct net_device *dev)
> free_irq(priv->r_irq, dev);
> free_irq(priv->t_irq, dev);
>
> - mpc52xx_fec_phy_stop(dev);
> + if (priv->phydev) {
> + /* power down phy */
> + phy_stop(priv->phydev);
> + phy_disconnect(priv->phydev);
> + priv->phydev = NULL;
> + }
>
> return 0;
> }
> @@ -700,7 +643,7 @@ static void mpc52xx_fec_hw_init(struct net_device *dev)
> /* set phy speed.
> * this can't be done in phy driver, since it needs to be called
> * before fec stuff (even on resume) */
> - mpc52xx_fec_phy_hw_init(priv);
> + out_be32(&fec->mii_speed, priv->mdio_speed);
> }
>
> /**
> @@ -736,7 +679,7 @@ static void mpc52xx_fec_start(struct net_device *dev)
> rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */
> rcntrl |= FEC_RCNTRL_FCE;
>
> - if (priv->phy_addr != FEC5200_PHYADDR_7WIRE)
> + if (!priv->seven_wire_mode)
> rcntrl |= FEC_RCNTRL_MII_MODE;
>
> if (priv->duplex == DUPLEX_FULL)
> @@ -802,8 +745,6 @@ static void mpc52xx_fec_stop(struct net_device *dev)
>
> /* Stop FEC */
> out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
> -
> - return;
> }
>
> /* reset fec and bestcomm tasks */
> @@ -821,9 +762,11 @@ static void mpc52xx_fec_reset(struct net_device *dev)
>
> mpc52xx_fec_hw_init(dev);
>
> - phy_stop(priv->phydev);
> - phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
> - phy_start(priv->phydev);
> + if (priv->phydev) {
> + phy_stop(priv->phydev);
> + phy_write(priv->phydev, MII_BMCR, BMCR_RESET);
> + phy_start(priv->phydev);
> + }
>
> bcom_fec_rx_reset(priv->rx_dmatsk);
> bcom_fec_tx_reset(priv->tx_dmatsk);
> @@ -923,7 +866,6 @@ static const struct net_device_ops mpc52xx_fec_netdev_ops = {
> #endif
> };
>
> -
> static int __devinit
> mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
> {
> @@ -931,8 +873,6 @@ mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
> struct net_device *ndev;
> struct mpc52xx_fec_priv *priv = NULL;
> struct resource mem;
> - struct device_node *phy_node;
> - const phandle *phy_handle;
> const u32 *prop;
> int prop_size;
>
> @@ -945,6 +885,7 @@ mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
> return -ENOMEM;
>
> priv = netdev_priv(ndev);
> + priv->ndev = ndev;
>
> /* Reserve FEC control zone */
> rv = of_address_to_resource(op->node, 0, &mem);
> @@ -968,6 +909,7 @@ mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
> ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT;
> ndev->base_addr = mem.start;
> ndev->netdev_ops = &mpc52xx_fec_netdev_ops;
> + SET_NETDEV_DEV(ndev, &op->dev);
>
> priv->t_irq = priv->r_irq = ndev->irq = NO_IRQ; /* IRQ are free for now */
>
> @@ -1017,14 +959,9 @@ mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
> */
>
> /* Start with safe defaults for link connection */
> - priv->phy_addr = FEC5200_PHYADDR_NONE;
> - priv->speed = 100;
> + priv->speed = 10;
> priv->duplex = DUPLEX_HALF;
> - priv->phy_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
> -
> - /* the 7-wire property means don't use MII mode */
> - if (of_find_property(op->node, "fsl,7-wire-mode", NULL))
> - priv->phy_addr = FEC5200_PHYADDR_7WIRE;
> + priv->mdio_speed = ((mpc52xx_find_ipb_freq(op->node) >> 20) / 5) << 1;
>
> /* The current speed preconfigures the speed of the MII link */
> prop = of_get_property(op->node, "current-speed", &prop_size);
> @@ -1033,43 +970,23 @@ mpc52xx_fec_probe(struct of_device *op, const struct of_device_id *match)
> priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
> }
>
> - /* If there is a phy handle, setup link to that phy */
> - phy_handle = of_get_property(op->node, "phy-handle", &prop_size);
> - if (phy_handle && (prop_size >= sizeof(phandle))) {
> - phy_node = of_find_node_by_phandle(*phy_handle);
> - prop = of_get_property(phy_node, "reg", &prop_size);
> - if (prop && (prop_size >= sizeof(u32)))
> - if ((*prop >= 0) && (*prop < PHY_MAX_ADDR))
> - priv->phy_addr = *prop;
> - of_node_put(phy_node);
> + /* If there is a phy handle, then get the PHY node */
> + priv->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
> +
> + /* the 7-wire property means don't use MII mode */
> + if (of_find_property(op->node, "fsl,7-wire-mode", NULL)) {
> + priv->seven_wire_mode = 1;
> + dev_info(&ndev->dev, "using 7-wire PHY mode\n");
> }
>
> /* Hardware init */
> mpc52xx_fec_hw_init(ndev);
> -
> mpc52xx_fec_reset_stats(ndev);
>
> - SET_NETDEV_DEV(ndev, &op->dev);
> -
> - /* Register the new network device */
> rv = register_netdev(ndev);
> if (rv < 0)
> goto probe_error;
>
> - /* Now report the link setup */
> - switch (priv->phy_addr) {
> - case FEC5200_PHYADDR_NONE:
> - dev_info(&ndev->dev, "Fixed speed MII link: %i%cD\n",
> - priv->speed, priv->duplex ? 'F' : 'H');
> - break;
> - case FEC5200_PHYADDR_7WIRE:
> - dev_info(&ndev->dev, "using 7-wire PHY mode\n");
> - break;
> - default:
> - dev_info(&ndev->dev, "Using PHY at MDIO address %i\n",
> - priv->phy_addr);
> - }
> -
> /* We're done ! */
> dev_set_drvdata(&op->dev, ndev);
>
> diff --git a/drivers/net/fec_mpc52xx_phy.c b/drivers/net/fec_mpc52xx_phy.c
> index dd9bfa4..fec9f24 100644
> --- a/drivers/net/fec_mpc52xx_phy.c
> +++ b/drivers/net/fec_mpc52xx_phy.c
> @@ -14,12 +14,14 @@
> #include <linux/netdevice.h>
> #include <linux/phy.h>
> #include <linux/of_platform.h>
> +#include <linux/of_mdio.h>
> #include <asm/io.h>
> #include <asm/mpc52xx.h>
> #include "fec_mpc52xx.h"
>
> struct mpc52xx_fec_mdio_priv {
> struct mpc52xx_fec __iomem *regs;
> + int mdio_irqs[PHY_MAX_ADDR];
> };
>
> static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
> @@ -27,7 +29,7 @@ static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
> {
> struct mpc52xx_fec_mdio_priv *priv = bus->priv;
> struct mpc52xx_fec __iomem *fec;
> - int tries = 100;
> + int tries = 3;
>
> value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
> value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
> @@ -38,7 +40,7 @@ static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
>
> /* wait for it to finish, this takes about 23 us on lite5200b */
> while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
> - udelay(5);
> + msleep(1);
>
> if (!tries)
> return -ETIMEDOUT;
> @@ -64,7 +66,6 @@ static int mpc52xx_fec_mdio_probe(struct of_device *of,
> {
> struct device *dev = &of->dev;
> struct device_node *np = of->node;
> - struct device_node *child = NULL;
> struct mii_bus *bus;
> struct mpc52xx_fec_mdio_priv *priv;
> struct resource res = {};
> @@ -85,22 +86,7 @@ static int mpc52xx_fec_mdio_probe(struct of_device *of,
> bus->write = mpc52xx_fec_mdio_write;
>
> /* setup irqs */
> - bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
> - if (bus->irq == NULL) {
> - err = -ENOMEM;
> - goto out_free;
> - }
> - for (i=0; i<PHY_MAX_ADDR; i++)
> - bus->irq[i] = PHY_POLL;
> -
> - while ((child = of_get_next_child(np, child)) != NULL) {
> - int irq = irq_of_parse_and_map(child, 0);
> - if (irq != NO_IRQ) {
> - const u32 *id = of_get_property(child, "reg", NULL);
> - if (id)
> - bus->irq[*id] = irq;
> - }
> - }
> + bus->irq = priv->mdio_irqs;
>
> /* setup registers */
> err = of_address_to_resource(np, 0, &res);
> @@ -122,7 +108,7 @@ static int mpc52xx_fec_mdio_probe(struct of_device *of,
> out_be32(&priv->regs->mii_speed,
> ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
>
> - err = mdiobus_register(bus);
> + err = of_mdiobus_register(bus, np);
> if (err)
> goto out_unmap;
>
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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