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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8d813941b1
This gets the FEC ethernet driver working again on the lite5200 platform. The FEC driver is also compatible with the MPC5200, not only with the MPC5200B, so this adds a suitable entry to the driver's match list. Furthermore this adds the settings for the PHY in the dts file for the Lite5200. Note, that this is not exactly the same as in the Lite5200B, because the PHY is located at f0003000:01 for the 5200, and at :00 for the 5200B. This was tested on a Lite5200 and a Lite5200B, both booted a kernel via tftp and mounted the root via nfs successfully. Signed-off-by: René Bürgel <r.buergel@unicontrol.de> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
199 lines
4.6 KiB
C
199 lines
4.6 KiB
C
/*
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* Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
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*
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* Copyright (C) 2007 Domen Puncer, Telargo, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/phy.h>
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#include <linux/of_platform.h>
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#include <asm/io.h>
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#include <asm/mpc52xx.h>
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#include "fec_mpc52xx.h"
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struct mpc52xx_fec_mdio_priv {
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struct mpc52xx_fec __iomem *regs;
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};
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static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
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{
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struct mpc52xx_fec_mdio_priv *priv = bus->priv;
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struct mpc52xx_fec __iomem *fec;
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int tries = 100;
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u32 request = FEC_MII_READ_FRAME;
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fec = priv->regs;
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out_be32(&fec->ievent, FEC_IEVENT_MII);
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request |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
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request |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
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out_be32(&priv->regs->mii_data, request);
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/* wait for it to finish, this takes about 23 us on lite5200b */
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while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
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udelay(5);
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if (tries == 0)
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return -ETIMEDOUT;
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return in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK;
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}
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static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
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{
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struct mpc52xx_fec_mdio_priv *priv = bus->priv;
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struct mpc52xx_fec __iomem *fec;
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u32 value = data;
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int tries = 100;
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fec = priv->regs;
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out_be32(&fec->ievent, FEC_IEVENT_MII);
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value |= FEC_MII_WRITE_FRAME;
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value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
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value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
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out_be32(&priv->regs->mii_data, value);
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/* wait for request to finish */
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while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
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udelay(5);
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if (tries == 0)
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return -ETIMEDOUT;
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return 0;
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}
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static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_id *match)
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{
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struct device *dev = &of->dev;
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struct device_node *np = of->node;
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struct device_node *child = NULL;
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struct mii_bus *bus;
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struct mpc52xx_fec_mdio_priv *priv;
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struct resource res = {};
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int err;
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int i;
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bus = kzalloc(sizeof(*bus), GFP_KERNEL);
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if (bus == NULL)
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return -ENOMEM;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv == NULL) {
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err = -ENOMEM;
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goto out_free;
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}
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bus->name = "mpc52xx MII bus";
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bus->read = mpc52xx_fec_mdio_read;
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bus->write = mpc52xx_fec_mdio_write;
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/* setup irqs */
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bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
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if (bus->irq == NULL) {
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err = -ENOMEM;
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goto out_free;
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}
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for (i=0; i<PHY_MAX_ADDR; i++)
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bus->irq[i] = PHY_POLL;
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while ((child = of_get_next_child(np, child)) != NULL) {
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int irq = irq_of_parse_and_map(child, 0);
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if (irq != NO_IRQ) {
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const u32 *id = of_get_property(child, "reg", NULL);
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if (id)
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bus->irq[*id] = irq;
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}
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}
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/* setup registers */
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err = of_address_to_resource(np, 0, &res);
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if (err)
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goto out_free;
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priv->regs = ioremap(res.start, res.end - res.start + 1);
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if (priv->regs == NULL) {
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err = -ENOMEM;
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goto out_free;
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}
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bus->id = res.start;
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bus->priv = priv;
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bus->dev = dev;
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dev_set_drvdata(dev, bus);
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/* set MII speed */
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out_be32(&priv->regs->mii_speed, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
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/* enable MII interrupt */
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out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);
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err = mdiobus_register(bus);
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if (err)
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goto out_unmap;
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return 0;
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out_unmap:
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iounmap(priv->regs);
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out_free:
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for (i=0; i<PHY_MAX_ADDR; i++)
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if (bus->irq[i] != PHY_POLL)
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irq_dispose_mapping(bus->irq[i]);
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kfree(bus->irq);
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kfree(priv);
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kfree(bus);
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return err;
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}
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static int mpc52xx_fec_mdio_remove(struct of_device *of)
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{
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struct device *dev = &of->dev;
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struct mii_bus *bus = dev_get_drvdata(dev);
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struct mpc52xx_fec_mdio_priv *priv = bus->priv;
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int i;
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mdiobus_unregister(bus);
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dev_set_drvdata(dev, NULL);
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iounmap(priv->regs);
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for (i=0; i<PHY_MAX_ADDR; i++)
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if (bus->irq[i])
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irq_dispose_mapping(bus->irq[i]);
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kfree(priv);
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kfree(bus->irq);
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kfree(bus);
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return 0;
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}
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static struct of_device_id mpc52xx_fec_mdio_match[] = {
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{ .compatible = "fsl,mpc5200b-mdio", },
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{ .compatible = "fsl,mpc5200-mdio", },
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{ .compatible = "mpc5200b-fec-phy", },
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{}
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};
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struct of_platform_driver mpc52xx_fec_mdio_driver = {
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.name = "mpc5200b-fec-phy",
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.probe = mpc52xx_fec_mdio_probe,
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.remove = mpc52xx_fec_mdio_remove,
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.match_table = mpc52xx_fec_mdio_match,
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};
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/* let fec driver call it, since this has to be registered before it */
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EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
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MODULE_LICENSE("Dual BSD/GPL");
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