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
  26 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  27 #include <linux/of_platform.h>
  28 #endif
  29
  30 #include "fs_enet.h"
  31
  32 struct bb_info {
  33         struct mdiobb_ctrl ctrl;
  34         __be32 __iomem *dir;
  35         __be32 __iomem *dat;
  36         u32 mdio_msk;
  37         u32 mdc_msk;
  38 };
  39
  40 /* FIXME: If any other users of GPIO crop up, then these will have to
  41  * have some sort of global synchronization to avoid races with other
  42  * pins on the same port.  The ideal solution would probably be to
  43  * bind the ports to a GPIO driver, and have this be a client of it.
  44  */
  45 static inline void bb_set(u32 __iomem *p, u32 m)
  46 {
  47         out_be32(p, in_be32(p) | m);
  48 }
  49
  50 static inline void bb_clr(u32 __iomem *p, u32 m)
  51 {
  52         out_be32(p, in_be32(p) & ~m);
  53 }
  54
  55 static inline int bb_read(u32 __iomem *p, u32 m)
  56 {
  57         return (in_be32(p) & m) != 0;
  58 }
  59
  60 static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
  61 {
  62         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  63
  64         if (dir)
  65                 bb_set(bitbang->dir, bitbang->mdio_msk);
  66         else
  67                 bb_clr(bitbang->dir, bitbang->mdio_msk);
  68
  69         /* Read back to flush the write. */
  70         in_be32(bitbang->dir);
  71 }
  72
  73 static inline int mdio_read(struct mdiobb_ctrl *ctrl)
  74 {
  75         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  76         return bb_read(bitbang->dat, bitbang->mdio_msk);
  77 }
  78
  79 static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
  80 {
  81         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  82
  83         if (what)
  84                 bb_set(bitbang->dat, bitbang->mdio_msk);
  85         else
  86                 bb_clr(bitbang->dat, bitbang->mdio_msk);
  87
  88         /* Read back to flush the write. */
  89         in_be32(bitbang->dat);
  90 }
  91
  92 static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
  93 {
  94         struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
  95
  96         if (what)
  97                 bb_set(bitbang->dat, bitbang->mdc_msk);
  98         else
  99                 bb_clr(bitbang->dat, bitbang->mdc_msk);
 100
 101         /* Read back to flush the write. */
 102         in_be32(bitbang->dat);
 103 }
 104
 105 static struct mdiobb_ops bb_ops = {
 106         .owner = THIS_MODULE,
 107         .set_mdc = mdc,
 108         .set_mdio_dir = mdio_dir,
 109         .set_mdio_data = mdio,
 110         .get_mdio_data = mdio_read,
 111 };
 112
 113 #ifdef CONFIG_PPC_CPM_NEW_BINDING
 114 static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
 115                                          struct device_node *np)
 116 {
 117         struct resource res;
 118         const u32 *data;
 119         int mdio_pin, mdc_pin, len;
 120         struct bb_info *bitbang = bus->priv;
 121
 122         int ret = of_address_to_resource(np, 0, &res);
 123         if (ret)
 124                 return ret;
 125
 126         if (res.end - res.start < 13)
 127                 return -ENODEV;
 128
 129         /* This should really encode the pin number as well, but all
 130          * we get is an int, and the odds of multiple bitbang mdio buses
 131          * is low enough that it's not worth going too crazy.
 132          */
 133         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 134
 135         data = of_get_property(np, "fsl,mdio-pin", &len);
 136         if (!data || len != 4)
 137                 return -ENODEV;
 138         mdio_pin = *data;
 139
 140         data = of_get_property(np, "fsl,mdc-pin", &len);
 141         if (!data || len != 4)
 142                 return -ENODEV;
 143         mdc_pin = *data;
 144
 145         bitbang->dir = ioremap(res.start, res.end - res.start + 1);
 146         if (!bitbang->dir)
 147                 return -ENOMEM;
 148
 149         bitbang->dat = bitbang->dir + 4;
 150         bitbang->mdio_msk = 1 << (31 - mdio_pin);
 151         bitbang->mdc_msk = 1 << (31 - mdc_pin);
 152
 153         return 0;
 154 }
 155
 156 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
 157 {
 158         const u32 *data;
 159         int len, id, irq;
 160
 161         data = of_get_property(np, "reg", &len);
 162         if (!data || len != 4)
 163                 return;
 164
 165         id = *data;
 166         bus->phy_mask &= ~(1 << id);
 167
 168         irq = of_irq_to_resource(np, 0, NULL);
 169         if (irq != NO_IRQ)
 170                 bus->irq[id] = irq;
 171 }
 172
 173 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
 174                                         const struct of_device_id *match)
 175 {
 176         struct device_node *np = NULL;
 177         struct mii_bus *new_bus;
 178         struct bb_info *bitbang;
 179         int ret = -ENOMEM;
 180         int i;
 181
 182         bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
 183         if (!bitbang)
 184                 goto out;
 185
 186         bitbang->ctrl.ops = &bb_ops;
 187
 188         new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
 189         if (!new_bus)
 190                 goto out_free_priv;
 191
 192         new_bus->name = "CPM2 Bitbanged MII",
 193
 194         ret = fs_mii_bitbang_init(new_bus, ofdev->node);
 195         if (ret)
 196                 goto out_free_bus;
 197
 198         new_bus->phy_mask = ~0;
 199         new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 200         if (!new_bus->irq)
 201                 goto out_unmap_regs;
 202
 203         for (i = 0; i < PHY_MAX_ADDR; i++)
 204                 new_bus->irq[i] = -1;
 205
 206         while ((np = of_get_next_child(ofdev->node, np)))
 207                 if (!strcmp(np->type, "ethernet-phy"))
 208                         add_phy(new_bus, np);
 209
 210         new_bus->dev = &ofdev->dev;
 211         dev_set_drvdata(&ofdev->dev, new_bus);
 212
 213         ret = mdiobus_register(new_bus);
 214         if (ret)
 215                 goto out_free_irqs;
 216
 217         return 0;
 218
 219 out_free_irqs:
 220         dev_set_drvdata(&ofdev->dev, NULL);
 221         kfree(new_bus->irq);
 222 out_unmap_regs:
 223         iounmap(bitbang->dir);
 224 out_free_bus:
 225         kfree(new_bus);
 226 out_free_priv:
 227         free_mdio_bitbang(new_bus);
 228 out:
 229         return ret;
 230 }
 231
 232 static int fs_enet_mdio_remove(struct of_device *ofdev)
 233 {
 234         struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 235         struct bb_info *bitbang = bus->priv;
 236
 237         mdiobus_unregister(bus);
 238         free_mdio_bitbang(bus);
 239         dev_set_drvdata(&ofdev->dev, NULL);
 240         kfree(bus->irq);
 241         iounmap(bitbang->dir);
 242         kfree(bitbang);
 243         kfree(bus);
 244
 245         return 0;
 246 }
 247
 248 static struct of_device_id fs_enet_mdio_bb_match[] = {
 249         {
 250                 .compatible = "fsl,cpm2-mdio-bitbang",
 251         },
 252         {},
 253 };
 254
 255 static struct of_platform_driver fs_enet_bb_mdio_driver = {
 256         .name = "fsl-bb-mdio",
 257         .match_table = fs_enet_mdio_bb_match,
 258         .probe = fs_enet_mdio_probe,
 259         .remove = fs_enet_mdio_remove,
 260 };
 261
 262 static int fs_enet_mdio_bb_init(void)
 263 {
 264         return of_register_platform_driver(&fs_enet_bb_mdio_driver);
 265 }
 266
 267 static void fs_enet_mdio_bb_exit(void)
 268 {
 269         of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
 270 }
 271
 272 module_init(fs_enet_mdio_bb_init);
 273 module_exit(fs_enet_mdio_bb_exit);
 274 #else
 275 static int __devinit fs_mii_bitbang_init(struct bb_info *bitbang,
 276                                          struct fs_mii_bb_platform_info *fmpi)
 277 {
 278         bitbang->dir = (u32 __iomem *)fmpi->mdio_dir.offset;
 279         bitbang->dat = (u32 __iomem *)fmpi->mdio_dat.offset;
 280         bitbang->mdio_msk = 1U << (31 - fmpi->mdio_dat.bit);
 281         bitbang->mdc_msk = 1U << (31 - fmpi->mdc_dat.bit);
 282
 283         return 0;
 284 }
 285
 286 static int __devinit fs_enet_mdio_probe(struct device *dev)
 287 {
 288         struct platform_device *pdev = to_platform_device(dev);
 289         struct fs_mii_bb_platform_info *pdata;
 290         struct mii_bus *new_bus;
 291         struct bb_info *bitbang;
 292         int err = 0;
 293
 294         if (NULL == dev)
 295                 return -EINVAL;
 296
 297         bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
 298
 299         if (NULL == bitbang)
 300                 return -ENOMEM;
 301
 302         bitbang->ctrl.ops = &bb_ops;
 303
 304         new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
 305
 306         if (NULL == new_bus)
 307                 return -ENOMEM;
 308
 309         new_bus->name = "BB MII Bus",
 310         snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);
 311
 312         new_bus->phy_mask = ~0x9;
 313         pdata = (struct fs_mii_bb_platform_info *)pdev->dev.platform_data;
 314
 315         if (NULL == pdata) {
 316                 printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
 317                 return -ENODEV;
 318         }
 319
 320         /*set up workspace*/
 321         fs_mii_bitbang_init(bitbang, pdata);
 322
 323         new_bus->priv = bitbang;
 324
 325         new_bus->irq = pdata->irq;
 326
 327         new_bus->dev = dev;
 328         dev_set_drvdata(dev, new_bus);
 329
 330         err = mdiobus_register(new_bus);
 331
 332         if (0 != err) {
 333                 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 334                                 new_bus->name);
 335                 goto bus_register_fail;
 336         }
 337
 338         return 0;
 339
 340 bus_register_fail:
 341         free_mdio_bitbang(new_bus);
 342         kfree(bitbang);
 343
 344         return err;
 345 }
 346
 347 static int fs_enet_mdio_remove(struct device *dev)
 348 {
 349         struct mii_bus *bus = dev_get_drvdata(dev);
 350
 351         mdiobus_unregister(bus);
 352
 353         dev_set_drvdata(dev, NULL);
 354
 355         free_mdio_bitbang(bus);
 356
 357         return 0;
 358 }
 359
 360 static struct device_driver fs_enet_bb_mdio_driver = {
 361         .name = "fsl-bb-mdio",
 362         .bus = &platform_bus_type,
 363         .probe = fs_enet_mdio_probe,
 364         .remove = fs_enet_mdio_remove,
 365 };
 366
 367 int fs_enet_mdio_bb_init(void)
 368 {
 369         return driver_register(&fs_enet_bb_mdio_driver);
 370 }
 371
 372 void fs_enet_mdio_bb_exit(void)
 373 {
 374         driver_unregister(&fs_enet_bb_mdio_driver);
 375 }
 376 #endif