release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/net/fs_enet/mii-bitbang.c

   1 /*
   2  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * This file is licensed under the terms of the GNU General Public License
  11  * version 2. This program is licensed "as is" without any warranty of any
  12  * kind, whether express or implied.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/ioport.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/etherdevice.h>
  22 #include <linux/mii.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/mdio-bitbang.h>
  25 #include <linux/of_mdio.h>
  26 #include <linux/of_platform.h>
  27
  28 #include "fs_enet.h"
  29
  30 struct bb_info {
  31         struct mdiobb_ctrl ctrl;
  32         __be32 __iomem *dir;
  33         __be32 __iomem *dat;
  34         u32 mdio_msk;
  35         u32 mdc_msk;
  36 };
  37
  38 static inline void bb_set(u32 __iomem *p, u32 m)
  39 {
  40         out_be32(p, in_be32(p) | m);
  41 }
  42
  43 static inline void bb_clr(u32 __iomem *p, u32 m)
  44 {
  45         out_be32(p, in_be32(p) & ~m);
  46 }
  47
  48 static inline int bb_read(u32 __iomem *p, u32 m)
  49 {
  50         return (in_be32(p) & m) != 0;
  51 }
  52
  53 static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
  54 {
  55         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  56
  57         if (dir)
  58                 bb_set(bitbang->dir, bitbang->mdio_msk);
  59         else
  60                 bb_clr(bitbang->dir, bitbang->mdio_msk);
  61
  62         /* Read back to flush the write. */
  63         in_be32(bitbang->dir);
  64 }
  65
  66 static inline int mdio_read(struct mdiobb_ctrl *ctrl)
  67 {
  68         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  69         return bb_read(bitbang->dat, bitbang->mdio_msk);
  70 }
  71
  72 static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
  73 {
  74         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  75
  76         if (what)
  77                 bb_set(bitbang->dat, bitbang->mdio_msk);
  78         else
  79                 bb_clr(bitbang->dat, bitbang->mdio_msk);
  80
  81         /* Read back to flush the write. */
  82         in_be32(bitbang->dat);
  83 }
  84
  85 static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
  86 {
  87         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  88
  89         if (what)
  90                 bb_set(bitbang->dat, bitbang->mdc_msk);
  91         else
  92                 bb_clr(bitbang->dat, bitbang->mdc_msk);
  93
  94         /* Read back to flush the write. */
  95         in_be32(bitbang->dat);
  96 }
  97
  98 static struct mdiobb_ops bb_ops = {
  99         .owner = THIS_MODULE,
 100         .set_mdc = mdc,
 101         .set_mdio_dir = mdio_dir,
 102         .set_mdio_data = mdio,
 103         .get_mdio_data = mdio_read,
 104 };
 105
 106 static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
 107                                          struct device_node *np)
 108 {
 109         struct resource res;
 110         const u32 *data;
 111         int mdio_pin, mdc_pin, len;
 112         struct bb_info *bitbang = bus->priv;
 113
 114         int ret = of_address_to_resource(np, 0, &res);
 115         if (ret)
 116                 return ret;
 117
 118         if (res.end - res.start < 13)
 119                 return -ENODEV;
 120
 121         /* This should really encode the pin number as well, but all
 122          * we get is an int, and the odds of multiple bitbang mdio buses
 123          * is low enough that it's not worth going too crazy.
 124          */
 125         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 126
 127         data = of_get_property(np, "fsl,mdio-pin", &len);
 128         if (!data || len != 4)
 129                 return -ENODEV;
 130         mdio_pin = *data;
 131
 132         data = of_get_property(np, "fsl,mdc-pin", &len);
 133         if (!data || len != 4)
 134                 return -ENODEV;
 135         mdc_pin = *data;
 136
 137         bitbang->dir = ioremap(res.start, res.end - res.start + 1);
 138         if (!bitbang->dir)
 139                 return -ENOMEM;
 140
 141         bitbang->dat = bitbang->dir + 4;
 142         bitbang->mdio_msk = 1 << (31 - mdio_pin);
 143         bitbang->mdc_msk = 1 << (31 - mdc_pin);
 144
 145         return 0;
 146 }
 147
 148 static int __devinit fs_enet_mdio_probe(struct platform_device *ofdev,
 149                                         const struct of_device_id *match)
 150 {
 151         struct mii_bus *new_bus;
 152         struct bb_info *bitbang;
 153         int ret = -ENOMEM;
 154
 155         bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
 156         if (!bitbang)
 157                 goto out;
 158
 159         bitbang->ctrl.ops = &bb_ops;
 160
 161         new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
 162         if (!new_bus)
 163                 goto out_free_priv;
 164
 165         new_bus->name = "CPM2 Bitbanged MII",
 166
 167         ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node);
 168         if (ret)
 169                 goto out_free_bus;
 170
 171         new_bus->phy_mask = ~0;
 172         new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 173         if (!new_bus->irq)
 174                 goto out_unmap_regs;
 175
 176         new_bus->parent = &ofdev->dev;
 177         dev_set_drvdata(&ofdev->dev, new_bus);
 178
 179         ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
 180         if (ret)
 181                 goto out_free_irqs;
 182
 183         return 0;
 184
 185 out_free_irqs:
 186         dev_set_drvdata(&ofdev->dev, NULL);
 187         kfree(new_bus->irq);
 188 out_unmap_regs:
 189         iounmap(bitbang->dir);
 190 out_free_bus:
 191         free_mdio_bitbang(new_bus);
 192 out_free_priv:
 193         kfree(bitbang);
 194 out:
 195         return ret;
 196 }
 197
 198 static int fs_enet_mdio_remove(struct platform_device *ofdev)
 199 {
 200         struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 201         struct bb_info *bitbang = bus->priv;
 202
 203         mdiobus_unregister(bus);
 204         dev_set_drvdata(&ofdev->dev, NULL);
 205         kfree(bus->irq);
 206         free_mdio_bitbang(bus);
 207         iounmap(bitbang->dir);
 208         kfree(bitbang);
 209
 210         return 0;
 211 }
 212
 213 static struct of_device_id fs_enet_mdio_bb_match[] = {
 214         {
 215                 .compatible = "fsl,cpm2-mdio-bitbang",
 216         },
 217         {},
 218 };
 219 MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
 220
 221 static struct of_platform_driver fs_enet_bb_mdio_driver = {
 222         .driver = {
 223                 .name = "fsl-bb-mdio",
 224                 .owner = THIS_MODULE,
 225                 .of_match_table = fs_enet_mdio_bb_match,
 226         },
 227         .probe = fs_enet_mdio_probe,
 228         .remove = fs_enet_mdio_remove,
 229 };
 230
 231 static int fs_enet_mdio_bb_init(void)
 232 {
 233         return of_register_platform_driver(&fs_enet_bb_mdio_driver);
 234 }
 235
 236 static void fs_enet_mdio_bb_exit(void)
 237 {
 238         of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
 239 }
 240
 241 module_init(fs_enet_mdio_bb_init);
 242 module_exit(fs_enet_mdio_bb_exit);