244 lines
5.5 KiB
C
244 lines
5.5 KiB
C
/*
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* Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
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*
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* Copyright (c) 2003 Intracom S.A.
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* by Pantelis Antoniou <panto@intracom.gr>
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*
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* 2005 (c) MontaVista Software, Inc.
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* Vitaly Bordug <vbordug@ru.mvista.com>
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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/module.h>
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#include <linux/ioport.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/mii.h>
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#include <linux/platform_device.h>
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#include <linux/mdio-bitbang.h>
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#include <linux/of_mdio.h>
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#include <linux/of_platform.h>
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#include "fs_enet.h"
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struct bb_info {
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struct mdiobb_ctrl ctrl;
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__be32 __iomem *dir;
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__be32 __iomem *dat;
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u32 mdio_msk;
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u32 mdc_msk;
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};
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/* FIXME: If any other users of GPIO crop up, then these will have to
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* have some sort of global synchronization to avoid races with other
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* pins on the same port. The ideal solution would probably be to
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* bind the ports to a GPIO driver, and have this be a client of it.
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*/
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static inline void bb_set(u32 __iomem *p, u32 m)
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{
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out_be32(p, in_be32(p) | m);
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}
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static inline void bb_clr(u32 __iomem *p, u32 m)
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{
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out_be32(p, in_be32(p) & ~m);
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}
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static inline int bb_read(u32 __iomem *p, u32 m)
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{
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return (in_be32(p) & m) != 0;
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}
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static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
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{
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struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
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if (dir)
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bb_set(bitbang->dir, bitbang->mdio_msk);
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else
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bb_clr(bitbang->dir, bitbang->mdio_msk);
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/* Read back to flush the write. */
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in_be32(bitbang->dir);
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}
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static inline int mdio_read(struct mdiobb_ctrl *ctrl)
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{
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struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
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return bb_read(bitbang->dat, bitbang->mdio_msk);
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}
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static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
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{
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struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
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if (what)
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bb_set(bitbang->dat, bitbang->mdio_msk);
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else
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bb_clr(bitbang->dat, bitbang->mdio_msk);
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/* Read back to flush the write. */
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in_be32(bitbang->dat);
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}
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static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
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{
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struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
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if (what)
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bb_set(bitbang->dat, bitbang->mdc_msk);
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else
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bb_clr(bitbang->dat, bitbang->mdc_msk);
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/* Read back to flush the write. */
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in_be32(bitbang->dat);
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}
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static struct mdiobb_ops bb_ops = {
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.owner = THIS_MODULE,
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.set_mdc = mdc,
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.set_mdio_dir = mdio_dir,
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.set_mdio_data = mdio,
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.get_mdio_data = mdio_read,
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};
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static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
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struct device_node *np)
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{
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struct resource res;
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const u32 *data;
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int mdio_pin, mdc_pin, len;
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struct bb_info *bitbang = bus->priv;
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int ret = of_address_to_resource(np, 0, &res);
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if (ret)
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return ret;
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if (res.end - res.start < 13)
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return -ENODEV;
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/* This should really encode the pin number as well, but all
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* we get is an int, and the odds of multiple bitbang mdio buses
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* is low enough that it's not worth going too crazy.
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*/
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snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
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data = of_get_property(np, "fsl,mdio-pin", &len);
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if (!data || len != 4)
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return -ENODEV;
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mdio_pin = *data;
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data = of_get_property(np, "fsl,mdc-pin", &len);
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if (!data || len != 4)
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return -ENODEV;
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mdc_pin = *data;
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bitbang->dir = ioremap(res.start, res.end - res.start + 1);
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if (!bitbang->dir)
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return -ENOMEM;
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bitbang->dat = bitbang->dir + 4;
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bitbang->mdio_msk = 1 << (31 - mdio_pin);
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bitbang->mdc_msk = 1 << (31 - mdc_pin);
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return 0;
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}
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static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
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const struct of_device_id *match)
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{
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struct mii_bus *new_bus;
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struct bb_info *bitbang;
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int ret = -ENOMEM;
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bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
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if (!bitbang)
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goto out;
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bitbang->ctrl.ops = &bb_ops;
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new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
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if (!new_bus)
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goto out_free_priv;
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new_bus->name = "CPM2 Bitbanged MII",
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ret = fs_mii_bitbang_init(new_bus, ofdev->node);
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if (ret)
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goto out_free_bus;
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new_bus->phy_mask = ~0;
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new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
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if (!new_bus->irq)
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goto out_unmap_regs;
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new_bus->parent = &ofdev->dev;
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dev_set_drvdata(&ofdev->dev, new_bus);
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ret = of_mdiobus_register(new_bus, ofdev->node);
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if (ret)
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goto out_free_irqs;
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return 0;
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out_free_irqs:
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dev_set_drvdata(&ofdev->dev, NULL);
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kfree(new_bus->irq);
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out_unmap_regs:
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iounmap(bitbang->dir);
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out_free_bus:
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free_mdio_bitbang(new_bus);
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out_free_priv:
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kfree(bitbang);
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out:
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return ret;
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}
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static int fs_enet_mdio_remove(struct of_device *ofdev)
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{
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struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
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struct bb_info *bitbang = bus->priv;
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mdiobus_unregister(bus);
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dev_set_drvdata(&ofdev->dev, NULL);
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kfree(bus->irq);
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free_mdio_bitbang(bus);
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iounmap(bitbang->dir);
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kfree(bitbang);
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return 0;
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}
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static struct of_device_id fs_enet_mdio_bb_match[] = {
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{
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.compatible = "fsl,cpm2-mdio-bitbang",
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},
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{},
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};
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static struct of_platform_driver fs_enet_bb_mdio_driver = {
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.name = "fsl-bb-mdio",
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.match_table = fs_enet_mdio_bb_match,
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.probe = fs_enet_mdio_probe,
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.remove = fs_enet_mdio_remove,
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};
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static int fs_enet_mdio_bb_init(void)
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{
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return of_register_platform_driver(&fs_enet_bb_mdio_driver);
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}
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static void fs_enet_mdio_bb_exit(void)
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{
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of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
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}
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module_init(fs_enet_mdio_bb_init);
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module_exit(fs_enet_mdio_bb_exit);
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