X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fnet%2Ffs_enet%2Fmii-bitbang.c;h=1620030cd33c92e7fd7044ea54c7f1d3c6442925;hb=4951704b4e23d71b99ac933d8e6993bc6225ac13;hp=f91447837fd49a709b5f62f4911a42db8ccd89f4;hpb=f630fe2817601314b2eb7ca5ddc23c7834646731;p=linux-2.6

diff --git a/drivers/net/fs_enet/mii-bitbang.c b/drivers/net/fs_enet/mii-bitbang.c
index f91447837f..1620030cd3 100644
--- a/drivers/net/fs_enet/mii-bitbang.c
+++ b/drivers/net/fs_enet/mii-bitbang.c
@@ -1,315 +1,288 @@
 /*
  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
  *
- * Copyright (c) 2003 Intracom S.A. 
+ * Copyright (c) 2003 Intracom S.A.
  *  by Pantelis Antoniou <panto@intracom.gr>
- * 
- * 2005 (c) MontaVista Software, Inc. 
+ *
+ * 2005 (c) MontaVista Software, Inc.
  * Vitaly Bordug <vbordug@ru.mvista.com>
  *
- * 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 
+ * 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/module.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/ptrace.h>
-#include <linux/errno.h>
 #include <linux/ioport.h>
 #include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/pci.h>
 #include <linux/init.h>
-#include <linux/delay.h>
+#include <linux/interrupt.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
-#include <linux/skbuff.h>
-#include <linux/spinlock.h>
 #include <linux/mii.h>
-#include <linux/ethtool.h>
-#include <linux/bitops.h>
 #include <linux/platform_device.h>
+#include <linux/mdio-bitbang.h>
 
-#include <asm/pgtable.h>
-#include <asm/irq.h>
-#include <asm/uaccess.h>
+#ifdef CONFIG_PPC_CPM_NEW_BINDING
+#include <linux/of_platform.h>
+#endif
 
 #include "fs_enet.h"
 
-static int bitbang_prep_bit(u8 **datp, u8 *mskp,
-		struct fs_mii_bit *mii_bit)
-{
-	void *dat;
-	int adv;
-	u8 msk;
-
-	dat = (void*) mii_bit->offset;
-
-	adv = mii_bit->bit >> 3;
-	dat = (char *)dat + adv;
-
-	msk = 1 << (7 - (mii_bit->bit & 7));
-
-	*datp = dat;
-	*mskp = msk;
-
-	return 0;
-}
+struct bb_info {
+	struct mdiobb_ctrl ctrl;
+	__be32 __iomem *dir;
+	__be32 __iomem *dat;
+	u32 mdio_msk;
+	u32 mdc_msk;
+};
 
-static inline void bb_set(u8 *p, u8 m)
+/* FIXME: If any other users of GPIO crop up, then these will have to
+ * have some sort of global synchronization to avoid races with other
+ * pins on the same port.  The ideal solution would probably be to
+ * bind the ports to a GPIO driver, and have this be a client of it.
+ */
+static inline void bb_set(u32 __iomem *p, u32 m)
 {
-	out_8(p, in_8(p) | m);
+	out_be32(p, in_be32(p) | m);
 }
 
-static inline void bb_clr(u8 *p, u8 m)
+static inline void bb_clr(u32 __iomem *p, u32 m)
 {
-	out_8(p, in_8(p) & ~m);
+	out_be32(p, in_be32(p) & ~m);
 }
 
-static inline int bb_read(u8 *p, u8 m)
+static inline int bb_read(u32 __iomem *p, u32 m)
 {
-	return (in_8(p) & m) != 0;
+	return (in_be32(p) & m) != 0;
 }
 
-static inline void mdio_active(struct bb_info *bitbang)
+static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
 {
-	bb_set(bitbang->mdio_dir, bitbang->mdio_dir_msk);
-}
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
 
-static inline void mdio_tristate(struct bb_info *bitbang )
-{
-	bb_clr(bitbang->mdio_dir, bitbang->mdio_dir_msk);
+	if (dir)
+		bb_set(bitbang->dir, bitbang->mdio_msk);
+	else
+		bb_clr(bitbang->dir, bitbang->mdio_msk);
+
+	/* Read back to flush the write. */
+	in_be32(bitbang->dir);
 }
 
-static inline int mdio_read(struct bb_info *bitbang )
+static inline int mdio_read(struct mdiobb_ctrl *ctrl)
 {
-	return bb_read(bitbang->mdio_dat, bitbang->mdio_dat_msk);
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+	return bb_read(bitbang->dat, bitbang->mdio_msk);
 }
 
-static inline void mdio(struct bb_info *bitbang , int what)
+static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
 {
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
 	if (what)
-		bb_set(bitbang->mdio_dat, bitbang->mdio_dat_msk);
+		bb_set(bitbang->dat, bitbang->mdio_msk);
 	else
-		bb_clr(bitbang->mdio_dat, bitbang->mdio_dat_msk);
+		bb_clr(bitbang->dat, bitbang->mdio_msk);
+
+	/* Read back to flush the write. */
+	in_be32(bitbang->dat);
 }
 
-static inline void mdc(struct bb_info *bitbang , int what)
+static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
 {
+	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
+
 	if (what)
-		bb_set(bitbang->mdc_dat, bitbang->mdc_msk);
+		bb_set(bitbang->dat, bitbang->mdc_msk);
 	else
-		bb_clr(bitbang->mdc_dat, bitbang->mdc_msk);
+		bb_clr(bitbang->dat, bitbang->mdc_msk);
+
+	/* Read back to flush the write. */
+	in_be32(bitbang->dat);
 }
 
-static inline void mii_delay(struct bb_info *bitbang )
+static struct mdiobb_ops bb_ops = {
+	.owner = THIS_MODULE,
+	.set_mdc = mdc,
+	.set_mdio_dir = mdio_dir,
+	.set_mdio_data = mdio,
+	.get_mdio_data = mdio_read,
+};
+
+#ifdef CONFIG_PPC_CPM_NEW_BINDING
+static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
+                                         struct device_node *np)
 {
-	udelay(bitbang->delay);
+	struct resource res;
+	const u32 *data;
+	int mdio_pin, mdc_pin, len;
+	struct bb_info *bitbang = bus->priv;
+
+	int ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		return ret;
+
+	if (res.end - res.start < 13)
+		return -ENODEV;
+
+	/* This should really encode the pin number as well, but all
+	 * we get is an int, and the odds of multiple bitbang mdio buses
+	 * is low enough that it's not worth going too crazy.
+	 */
+	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
+
+	data = of_get_property(np, "fsl,mdio-pin", &len);
+	if (!data || len != 4)
+		return -ENODEV;
+	mdio_pin = *data;
+
+	data = of_get_property(np, "fsl,mdc-pin", &len);
+	if (!data || len != 4)
+		return -ENODEV;
+	mdc_pin = *data;
+
+	bitbang->dir = ioremap(res.start, res.end - res.start + 1);
+	if (!bitbang->dir)
+		return -ENOMEM;
+
+	bitbang->dat = bitbang->dir + 4;
+	bitbang->mdio_msk = 1 << (31 - mdio_pin);
+	bitbang->mdc_msk = 1 << (31 - mdc_pin);
+
+	return 0;
 }
 
-/* Utility to send the preamble, address, and register (common to read and write). */
-static void bitbang_pre(struct bb_info *bitbang , int read, u8 addr, u8 reg)
+static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
 {
-	int j;
-
-	/*
-	 * Send a 32 bit preamble ('1's) with an extra '1' bit for good measure.
-	 * The IEEE spec says this is a PHY optional requirement.  The AMD
-	 * 79C874 requires one after power up and one after a MII communications
-	 * error.  This means that we are doing more preambles than we need,
-	 * but it is safer and will be much more robust.
-	 */
+	const u32 *data;
+	int len, id, irq;
 
-	mdio_active(bitbang);
-	mdio(bitbang, 1);
-	for (j = 0; j < 32; j++) {
-		mdc(bitbang, 0);
-		mii_delay(bitbang);
-		mdc(bitbang, 1);
-		mii_delay(bitbang);
-	}
+	data = of_get_property(np, "reg", &len);
+	if (!data || len != 4)
+		return;
 
-	/* send the start bit (01) and the read opcode (10) or write (10) */
-	mdc(bitbang, 0);
-	mdio(bitbang, 0);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 0);
-	mdio(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 0);
-	mdio(bitbang, read);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 0);
-	mdio(bitbang, !read);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-
-	/* send the PHY address */
-	for (j = 0; j < 5; j++) {
-		mdc(bitbang, 0);
-		mdio(bitbang, (addr & 0x10) != 0);
-		mii_delay(bitbang);
-		mdc(bitbang, 1);
-		mii_delay(bitbang);
-		addr <<= 1;
-	}
+	id = *data;
+	bus->phy_mask &= ~(1 << id);
 
-	/* send the register address */
-	for (j = 0; j < 5; j++) {
-		mdc(bitbang, 0);
-		mdio(bitbang, (reg & 0x10) != 0);
-		mii_delay(bitbang);
-		mdc(bitbang, 1);
-		mii_delay(bitbang);
-		reg <<= 1;
-	}
+	irq = of_irq_to_resource(np, 0, NULL);
+	if (irq != NO_IRQ)
+		bus->irq[id] = irq;
 }
 
-static int fs_enet_mii_bb_read(struct mii_bus *bus , int phy_id, int location)
+static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
+                                        const struct of_device_id *match)
 {
-	u16 rdreg;
-	int ret, j;
-	u8 addr = phy_id & 0xff;
-	u8 reg = location & 0xff;
-	struct bb_info* bitbang = bus->priv;
-
-	bitbang_pre(bitbang, 1, addr, reg);
-
-	/* tri-state our MDIO I/O pin so we can read */
-	mdc(bitbang, 0);
-	mdio_tristate(bitbang);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-
-	/* check the turnaround bit: the PHY should be driving it to zero */
-	if (mdio_read(bitbang) != 0) {
-		/* PHY didn't drive TA low */
-		for (j = 0; j < 32; j++) {
-			mdc(bitbang, 0);
-			mii_delay(bitbang);
-			mdc(bitbang, 1);
-			mii_delay(bitbang);
-		}
-		ret = -1;
+	struct device_node *np = NULL;
+	struct mii_bus *new_bus;
+	struct bb_info *bitbang;
+	int ret = -ENOMEM;
+	int i;
+
+	bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
+	if (!bitbang)
 		goto out;
-	}
 
-	mdc(bitbang, 0);
-	mii_delay(bitbang);
-
-	/* read 16 bits of register data, MSB first */
-	rdreg = 0;
-	for (j = 0; j < 16; j++) {
-		mdc(bitbang, 1);
-		mii_delay(bitbang);
-		rdreg <<= 1;
-		rdreg |= mdio_read(bitbang);
-		mdc(bitbang, 0);
-		mii_delay(bitbang);
-	}
+	bitbang->ctrl.ops = &bb_ops;
+
+	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
+	if (!new_bus)
+		goto out_free_priv;
+
+	new_bus->name = "CPM2 Bitbanged MII",
+
+	ret = fs_mii_bitbang_init(new_bus, ofdev->node);
+	if (ret)
+		goto out_free_bus;
+
+	new_bus->phy_mask = ~0;
+	new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+	if (!new_bus->irq)
+		goto out_unmap_regs;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		new_bus->irq[i] = -1;
+
+	while ((np = of_get_next_child(ofdev->node, np)))
+		if (!strcmp(np->type, "ethernet-phy"))
+			add_phy(new_bus, np);
+
+	new_bus->dev = &ofdev->dev;
+	dev_set_drvdata(&ofdev->dev, new_bus);
+
+	ret = mdiobus_register(new_bus);
+	if (ret)
+		goto out_free_irqs;
 
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 0);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
+	return 0;
 
-	ret = rdreg;
+out_free_irqs:
+	dev_set_drvdata(&ofdev->dev, NULL);
+	kfree(new_bus->irq);
+out_unmap_regs:
+	iounmap(bitbang->dir);
+out_free_bus:
+	kfree(new_bus);
+out_free_priv:
+	free_mdio_bitbang(new_bus);
 out:
 	return ret;
 }
 
-static int fs_enet_mii_bb_write(struct mii_bus *bus, int phy_id, int location, u16 val)
+static int fs_enet_mdio_remove(struct of_device *ofdev)
 {
-	int j;
-	struct bb_info* bitbang = bus->priv;
-
-	u8 addr = phy_id & 0xff;
-	u8 reg = location & 0xff;
-	u16 value = val & 0xffff;
-
-	bitbang_pre(bitbang, 0, addr, reg);
-
-	/* send the turnaround (10) */
-	mdc(bitbang, 0);
-	mdio(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-	mdc(bitbang, 0);
-	mdio(bitbang, 0);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-
-	/* write 16 bits of register data, MSB first */
-	for (j = 0; j < 16; j++) {
-		mdc(bitbang, 0);
-		mdio(bitbang, (value & 0x8000) != 0);
-		mii_delay(bitbang);
-		mdc(bitbang, 1);
-		mii_delay(bitbang);
-		value <<= 1;
-	}
+	struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
+	struct bb_info *bitbang = bus->priv;
 
-	/*
-	 * Tri-state the MDIO line.
-	 */
-	mdio_tristate(bitbang);
-	mdc(bitbang, 0);
-	mii_delay(bitbang);
-	mdc(bitbang, 1);
-	mii_delay(bitbang);
-	return 0;
-}
+	mdiobus_unregister(bus);
+	free_mdio_bitbang(bus);
+	dev_set_drvdata(&ofdev->dev, NULL);
+	kfree(bus->irq);
+	iounmap(bitbang->dir);
+	kfree(bitbang);
+	kfree(bus);
 
-static int fs_enet_mii_bb_reset(struct mii_bus *bus)
-{
-	/*nothing here - dunno how to reset it*/
 	return 0;
 }
 
-static int fs_mii_bitbang_init(struct bb_info *bitbang, struct fs_mii_bb_platform_info* fmpi)
-{
-	int r;
+static struct of_device_id fs_enet_mdio_bb_match[] = {
+	{
+		.compatible = "fsl,cpm2-mdio-bitbang",
+	},
+	{},
+};
 
-	bitbang->delay = fmpi->delay;
+static struct of_platform_driver fs_enet_bb_mdio_driver = {
+	.name = "fsl-bb-mdio",
+	.match_table = fs_enet_mdio_bb_match,
+	.probe = fs_enet_mdio_probe,
+	.remove = fs_enet_mdio_remove,
+};
 
-	r = bitbang_prep_bit(&bitbang->mdio_dir,
-			 &bitbang->mdio_dir_msk,
-			 &fmpi->mdio_dir);
-	if (r != 0)
-		return r;
+static int fs_enet_mdio_bb_init(void)
+{
+	return of_register_platform_driver(&fs_enet_bb_mdio_driver);
+}
 
-	r = bitbang_prep_bit(&bitbang->mdio_dat,
-			 &bitbang->mdio_dat_msk,
-			 &fmpi->mdio_dat);
-	if (r != 0)
-		return r;
+static void fs_enet_mdio_bb_exit(void)
+{
+	of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
+}
 
-	r = bitbang_prep_bit(&bitbang->mdc_dat,
-			 &bitbang->mdc_msk,
-			 &fmpi->mdc_dat);
-	if (r != 0)
-		return r;
+module_init(fs_enet_mdio_bb_init);
+module_exit(fs_enet_mdio_bb_exit);
+#else
+static int __devinit fs_mii_bitbang_init(struct bb_info *bitbang,
+                                         struct fs_mii_bb_platform_info *fmpi)
+{
+	bitbang->dir = (u32 __iomem *)fmpi->mdio_dir.offset;
+	bitbang->dat = (u32 __iomem *)fmpi->mdio_dat.offset;
+	bitbang->mdio_msk = 1U << (31 - fmpi->mdio_dat.bit);
+	bitbang->mdc_msk = 1U << (31 - fmpi->mdc_dat.bit);
 
 	return 0;
 }
 
-
 static int __devinit fs_enet_mdio_probe(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -321,21 +294,20 @@ static int __devinit fs_enet_mdio_probe(struct device *dev)
 	if (NULL == dev)
 		return -EINVAL;
 
-	new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
+	bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
 
-	if (NULL == new_bus)
+	if (NULL == bitbang)
 		return -ENOMEM;
 
-	bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
+	bitbang->ctrl.ops = &bb_ops;
 
-	if (NULL == bitbang)
+	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
+
+	if (NULL == new_bus)
 		return -ENOMEM;
 
 	new_bus->name = "BB MII Bus",
-	new_bus->read = &fs_enet_mii_bb_read,
-	new_bus->write = &fs_enet_mii_bb_write,
-	new_bus->reset = &fs_enet_mii_bb_reset,
-	new_bus->id = pdev->id;
+	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);
 
 	new_bus->phy_mask = ~0x9;
 	pdata = (struct fs_mii_bb_platform_info *)pdev->dev.platform_data;
@@ -366,13 +338,12 @@ static int __devinit fs_enet_mdio_probe(struct device *dev)
 	return 0;
 
 bus_register_fail:
+	free_mdio_bitbang(new_bus);
 	kfree(bitbang);
-	kfree(new_bus);
 
 	return err;
 }
 
-
 static int fs_enet_mdio_remove(struct device *dev)
 {
 	struct mii_bus *bus = dev_get_drvdata(dev);
@@ -381,9 +352,7 @@ static int fs_enet_mdio_remove(struct device *dev)
 
 	dev_set_drvdata(dev, NULL);
 
-	iounmap((void *) (&bus->priv));
-	bus->priv = NULL;
-	kfree(bus);
+	free_mdio_bitbang(bus);
 
 	return 0;
 }
@@ -404,4 +373,4 @@ void fs_enet_mdio_bb_exit(void)
 {
 	driver_unregister(&fs_enet_bb_mdio_driver);
 }
-
+#endif