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Message-ID: <20071014075958.GG3000@nd47.coderock.org>
Date: Sun, 14 Oct 2007 09:59:58 +0200
From: Domen Puncer <domen.puncer@...argo.com>
To: galak@...nel.crashing.org, jgarzik@...ox.com
Cc: linuxppc-dev@...abs.org, grant.likely@...retlab.ca, tnt@...tnt.com,
netdev@...r.kernel.org
Subject: [PATCH v3 4/4] FEC mpc52xx: phy part of the driver
PHY part of the driver for mpc5200(b) ethernet.
Signed-off-by: Domen Puncer <domen.puncer@...argo.com>
---
drivers/net/fec_mpc52xx/Kconfig | 13 ++
drivers/net/fec_mpc52xx/Makefile | 5
drivers/net/fec_mpc52xx/fec.c | 11 ++
drivers/net/fec_mpc52xx/fec.h | 2
drivers/net/fec_mpc52xx/fec_phy.c | 198 ++++++++++++++++++++++++++++++++++++++
5 files changed, 229 insertions(+)
Index: linux.git/drivers/net/fec_mpc52xx/fec_phy.c
===================================================================
--- /dev/null
+++ linux.git/drivers/net/fec_mpc52xx/fec_phy.c
@@ -0,0 +1,198 @@
+/*
+ * Driver for the MPC5200 Fast Ethernet Controller - PHY/MII part
+ *
+ * Copyright (C) 2007 Domen Puncer, Telargo, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/phy.h>
+#include <linux/of_platform.h>
+#include <asm/io.h>
+#include <asm/mpc52xx.h>
+#include "fec.h"
+
+struct fec_mdio_priv {
+ struct mpc52xx_fec __iomem *regs;
+};
+
+static int fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+ struct fec_mdio_priv *priv = bus->priv;
+ struct mpc52xx_fec __iomem *fec;
+ int tries = 100;
+ u32 request = FEC_MII_READ_FRAME;
+
+ fec = priv->regs;
+ out_be32(&fec->ievent, FEC_IEVENT_MII);
+
+ request |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
+ request |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
+
+ out_be32(&priv->regs->mii_data, request);
+
+ /* wait for it to finish, this takes about 23 us on lite5200b */
+ while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
+ udelay(5);
+
+ if (tries == 0)
+ return -ETIMEDOUT;
+
+ return in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK;
+}
+
+static int fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
+{
+ struct fec_mdio_priv *priv = bus->priv;
+ struct mpc52xx_fec __iomem *fec;
+ u32 value = data;
+ int tries = 100;
+
+ fec = priv->regs;
+ out_be32(&fec->ievent, FEC_IEVENT_MII);
+
+ value |= FEC_MII_WRITE_FRAME;
+ 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;
+
+ out_be32(&priv->regs->mii_data, value);
+
+ /* wait for request to finish */
+ while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
+ udelay(5);
+
+ if (tries == 0)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static int fec_mdio_probe(struct of_device *of, const struct of_device_id *match)
+{
+ struct device *dev = &of->dev;
+ struct device_node *np = of->node;
+ struct device_node *child = NULL;
+ struct mii_bus *bus;
+ struct fec_mdio_priv *priv;
+ struct resource res = {};
+ int err;
+ int i;
+
+ bus = kzalloc(sizeof(*bus), GFP_KERNEL);
+ if (bus == NULL)
+ return -ENOMEM;
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (priv == NULL) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ bus->name = "mpc52xx MII bus";
+ bus->read = fec_mdio_read;
+ bus->write = 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);
+ bus->irq[*id] = irq;
+ }
+ }
+
+ /* setup registers */
+ err = of_address_to_resource(np, 0, &res);
+ if (err)
+ goto out_free;
+ priv->regs = ioremap(res.start, res.end - res.start + 1);
+ if (priv->regs == NULL) {
+ err = -ENOMEM;
+ goto out_free;
+ }
+
+ bus->id = res.start;
+ bus->priv = priv;
+
+ bus->dev = dev;
+ dev_set_drvdata(dev, bus);
+
+ /* set MII speed */
+ out_be32(&priv->regs->mii_speed, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
+
+ /* enable MII interrupt */
+ out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);
+
+ err = mdiobus_register(bus);
+ if (err)
+ goto out_unmap;
+
+ return 0;
+
+ out_unmap:
+ iounmap(priv->regs);
+ out_free:
+ for (i=0; i<PHY_MAX_ADDR; i++)
+ if (bus->irq[i] != PHY_POLL)
+ irq_dispose_mapping(bus->irq[i]);
+ kfree(bus->irq);
+ kfree(priv);
+ kfree(bus);
+
+ return err;
+}
+
+static int fec_mdio_remove(struct of_device *of)
+{
+ struct device *dev = &of->dev;
+ struct mii_bus *bus = dev_get_drvdata(dev);
+ struct fec_mdio_priv *priv = bus->priv;
+ int i;
+
+ mdiobus_unregister(bus);
+ dev_set_drvdata(dev, NULL);
+
+ iounmap(priv->regs);
+ for (i=0; i<PHY_MAX_ADDR; i++)
+ if (bus->irq[i])
+ irq_dispose_mapping(bus->irq[i]);
+ kfree(priv);
+ kfree(bus->irq);
+ kfree(bus);
+
+ return 0;
+}
+
+
+static struct of_device_id fec_mdio_match[] = {
+ {
+ .type = "mdio",
+ .compatible = "mpc5200b-fec-phy",
+ },
+ {},
+};
+
+struct of_platform_driver mpc52xx_fec_mdio_driver = {
+ .name = "mpc5200b-fec-phy",
+ .probe = fec_mdio_probe,
+ .remove = fec_mdio_remove,
+ .match_table = fec_mdio_match,
+};
+
+/* let fec driver call it, since this has to be registered before it */
+EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
+
+
+MODULE_LICENSE("Dual BSD/GPL");
Index: linux.git/drivers/net/fec_mpc52xx/Makefile
===================================================================
--- linux.git.orig/drivers/net/fec_mpc52xx/Makefile
+++ linux.git/drivers/net/fec_mpc52xx/Makefile
@@ -1,2 +1,7 @@
obj-$(CONFIG_FEC_MPC52xx) += fec_mpc52xx.o
fec_mpc52xx-objs := fec.o
+
+ifeq ($(CONFIG_FEC_MPC52xx_MDIO),y)
+ obj-$(CONFIG_FEC_MPC52xx) += fec_mpc52xx_phy.o
+ fec_mpc52xx_phy-objs := fec_phy.o
+endif
Index: linux.git/drivers/net/fec_mpc52xx/Kconfig
===================================================================
--- linux.git.orig/drivers/net/fec_mpc52xx/Kconfig
+++ linux.git/drivers/net/fec_mpc52xx/Kconfig
@@ -11,5 +11,18 @@ config FEC_MPC52xx
---help---
This option enables support for the MPC5200's on-chip
Fast Ethernet Controller
+ If compiled as module, it will be called 'fec_mpc52xx.ko'.
+
+config FEC_MPC52xx_MDIO
+ bool "FEC MII PHY driver"
+ depends on FEC_MPC52xx
+ default y
+ ---help---
+ The MPC5200's FEC can connect to the Ethernet either with
+ an external MII PHY chip or 10 Mbps 7-wire interface
+ (Motorola? industry standard).
+ If your board uses an external PHY, enable this.
+ If not sure, enable.
+ If compiled as module, it will be called 'fec_mpc52xx_phy.ko'.
endmenu
Index: linux.git/drivers/net/fec_mpc52xx/fec.c
===================================================================
--- linux.git.orig/drivers/net/fec_mpc52xx/fec.c
+++ linux.git/drivers/net/fec_mpc52xx/fec.c
@@ -1080,6 +1080,14 @@ static struct of_platform_driver mpc52xx
static int __init
mpc52xx_fec_init(void)
{
+#ifdef CONFIG_FEC_MPC52xx_MDIO
+ int ret;
+ ret = of_register_platform_driver(&mpc52xx_fec_mdio_driver);
+ if (ret) {
+ printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
+ return ret;
+ }
+#endif
return of_register_platform_driver(&mpc52xx_fec_driver);
}
@@ -1087,6 +1095,9 @@ static void __exit
mpc52xx_fec_exit(void)
{
of_unregister_platform_driver(&mpc52xx_fec_driver);
+#ifdef CONFIG_FEC_MPC52xx_MDIO
+ of_unregister_platform_driver(&mpc52xx_fec_mdio_driver);
+#endif
}
Index: linux.git/drivers/net/fec_mpc52xx/fec.h
===================================================================
--- linux.git.orig/drivers/net/fec_mpc52xx/fec.h
+++ linux.git/drivers/net/fec_mpc52xx/fec.h
@@ -310,4 +310,6 @@ struct mpc52xx_fec {
#define FEC_XMIT_FSM_ENABLE_CRC 0x01000000
+extern struct of_platform_driver mpc52xx_fec_mdio_driver;
+
#endif /* __DRIVERS_NET_MPC52XX_FEC_H__ */
-
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