diff options
Diffstat (limited to 'drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c b/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c new file mode 100644 index 000000000..21de56345 --- /dev/null +++ b/drivers/net/ethernet/freescale/fs_enet/mii-bitbang.c @@ -0,0 +1,226 @@ +/* + * Combined Ethernet driver for Motorola MPC8xx and MPC82xx. + * + * Copyright (c) 2003 Intracom S.A. + * by Pantelis Antoniou <panto@intracom.gr> + * + * 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 + * kind, whether express or implied. + */ + +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/mii.h> +#include <linux/platform_device.h> +#include <linux/mdio-bitbang.h> +#include <linux/of_address.h> +#include <linux/of_mdio.h> +#include <linux/of_platform.h> + +#include "fs_enet.h" + +struct bb_info { + struct mdiobb_ctrl ctrl; + __be32 __iomem *dir; + __be32 __iomem *dat; + u32 mdio_msk; + u32 mdc_msk; +}; + +/* 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_be32(p, in_be32(p) | m); +} + +static inline void bb_clr(u32 __iomem *p, u32 m) +{ + out_be32(p, in_be32(p) & ~m); +} + +static inline int bb_read(u32 __iomem *p, u32 m) +{ + return (in_be32(p) & m) != 0; +} + +static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir) +{ + struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); + + 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 mdiobb_ctrl *ctrl) +{ + struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl); + return bb_read(bitbang->dat, bitbang->mdio_msk); +} + +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->dat, bitbang->mdio_msk); + else + bb_clr(bitbang->dat, bitbang->mdio_msk); + + /* Read back to flush the write. */ + in_be32(bitbang->dat); +} + +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->dat, bitbang->mdc_msk); + else + bb_clr(bitbang->dat, bitbang->mdc_msk); + + /* Read back to flush the write. */ + in_be32(bitbang->dat); +} + +static const 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, +}; + +static int fs_mii_bitbang_init(struct mii_bus *bus, struct device_node *np) +{ + 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 (resource_size(&res) <= 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, resource_size(&res)); + 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; +} + +static int fs_enet_mdio_probe(struct platform_device *ofdev) +{ + struct mii_bus *new_bus; + struct bb_info *bitbang; + int ret = -ENOMEM; + + bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL); + if (!bitbang) + goto out; + + 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->dev.of_node); + if (ret) + goto out_free_bus; + + new_bus->phy_mask = ~0; + + new_bus->parent = &ofdev->dev; + platform_set_drvdata(ofdev, new_bus); + + ret = of_mdiobus_register(new_bus, ofdev->dev.of_node); + if (ret) + goto out_unmap_regs; + + return 0; + +out_unmap_regs: + iounmap(bitbang->dir); +out_free_bus: + free_mdio_bitbang(new_bus); +out_free_priv: + kfree(bitbang); +out: + return ret; +} + +static int fs_enet_mdio_remove(struct platform_device *ofdev) +{ + struct mii_bus *bus = platform_get_drvdata(ofdev); + struct bb_info *bitbang = bus->priv; + + mdiobus_unregister(bus); + free_mdio_bitbang(bus); + iounmap(bitbang->dir); + kfree(bitbang); + + return 0; +} + +static const struct of_device_id fs_enet_mdio_bb_match[] = { + { + .compatible = "fsl,cpm2-mdio-bitbang", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match); + +static struct platform_driver fs_enet_bb_mdio_driver = { + .driver = { + .name = "fsl-bb-mdio", + .of_match_table = fs_enet_mdio_bb_match, + }, + .probe = fs_enet_mdio_probe, + .remove = fs_enet_mdio_remove, +}; + +module_platform_driver(fs_enet_bb_mdio_driver); +MODULE_LICENSE("GPL"); |