linux/drivers/fmc/fmc-fakedev.c
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   1/*
   2 * Copyright (C) 2012 CERN (www.cern.ch)
   3 * Author: Alessandro Rubini <rubini@gnudd.com>
   4 *
   5 * Permission to use, copy, modify, and/or distribute this software for any
   6 * purpose with or without fee is hereby granted, provided that the above
   7 * copyright notice and this permission notice appear in all copies.
   8 *
   9 * The software is provided "as is"; the copyright holders disclaim
  10 * all warranties and liabilities, to the extent permitted by
  11 * applicable law.
  12 */
  13#include <linux/module.h>
  14#include <linux/init.h>
  15#include <linux/string.h>
  16#include <linux/device.h>
  17#include <linux/slab.h>
  18#include <linux/firmware.h>
  19#include <linux/workqueue.h>
  20#include <linux/err.h>
  21#include <linux/fmc.h>
  22
  23#define FF_EEPROM_SIZE          8192    /* The standard eeprom size */
  24#define FF_MAX_MEZZANINES       4       /* Fakes a multi-mezzanine carrier */
  25
  26/* The user can pass up to 4 names of eeprom images to load */
  27static char *ff_eeprom[FF_MAX_MEZZANINES];
  28static int ff_nr_eeprom;
  29module_param_array_named(eeprom, ff_eeprom, charp, &ff_nr_eeprom, 0444);
  30
  31/* The user can ask for a multi-mezzanine carrier, with the default eeprom */
  32static int ff_nr_dev = 1;
  33module_param_named(ndev, ff_nr_dev, int, 0444);
  34
  35
  36/* Lazily, don't support the "standard" module parameters */
  37
  38/*
  39 * Eeprom built from these commands:
  40
  41        ../fru-generator -v fake-vendor -n fake-design-for-testing \
  42                -s 01234 -p none > IPMI-FRU
  43
  44        gensdbfs . ../fake-eeprom.bin
  45*/
  46static char ff_eeimg[FF_MAX_MEZZANINES][FF_EEPROM_SIZE] = {
  47        {
  48        0x01, 0x00, 0x00, 0x01, 0x00, 0x0c, 0x00, 0xf2, 0x01, 0x0b, 0x00, 0xb2,
  49        0x86, 0x87, 0xcb, 0x66, 0x61, 0x6b, 0x65, 0x2d, 0x76, 0x65, 0x6e, 0x64,
  50        0x6f, 0x72, 0xd7, 0x66, 0x61, 0x6b, 0x65, 0x2d, 0x64, 0x65, 0x73, 0x69,
  51        0x67, 0x6e, 0x2d, 0x66, 0x6f, 0x72, 0x2d, 0x74, 0x65, 0x73, 0x74, 0x69,
  52        0x6e, 0x67, 0xc5, 0x30, 0x31, 0x32, 0x33, 0x34, 0xc4, 0x6e, 0x6f, 0x6e,
  53        0x65, 0xda, 0x32, 0x30, 0x31, 0x32, 0x2d, 0x31, 0x31, 0x2d, 0x31, 0x39,
  54        0x20, 0x32, 0x32, 0x3a, 0x34, 0x32, 0x3a, 0x33, 0x30, 0x2e, 0x30, 0x37,
  55        0x34, 0x30, 0x35, 0x35, 0xc1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87,
  56        0x02, 0x02, 0x0d, 0xf7, 0xf8, 0x02, 0xb0, 0x04, 0x74, 0x04, 0xec, 0x04,
  57        0x00, 0x00, 0x00, 0x00, 0xe8, 0x03, 0x02, 0x02, 0x0d, 0x5c, 0x93, 0x01,
  58        0x4a, 0x01, 0x39, 0x01, 0x5a, 0x01, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x0b,
  59        0x02, 0x02, 0x0d, 0x63, 0x8c, 0x00, 0xfa, 0x00, 0xed, 0x00, 0x06, 0x01,
  60        0x00, 0x00, 0x00, 0x00, 0xa0, 0x0f, 0x01, 0x02, 0x0d, 0xfb, 0xf5, 0x05,
  61        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  62        0x01, 0x02, 0x0d, 0xfc, 0xf4, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  63        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x0d, 0xfd, 0xf3, 0x03,
  64        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  65        0xfa, 0x82, 0x0b, 0xea, 0x8f, 0xa2, 0x12, 0x00, 0x00, 0x1e, 0x44, 0x00,
  66        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  67        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  68        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  69        0x00, 0x00, 0x00, 0x00, 0x53, 0x44, 0x42, 0x2d, 0x00, 0x03, 0x01, 0x01,
  70        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
  71        0x00, 0x00, 0x01, 0xc4, 0x46, 0x69, 0x6c, 0x65, 0x44, 0x61, 0x74, 0x61,
  72        0x2e, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
  73        0x2e, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
  74        0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00,
  75        0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc0,
  76        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc4, 0x46, 0x69, 0x6c, 0x65,
  77        0x44, 0x61, 0x74, 0x61, 0x6e, 0x61, 0x6d, 0x65, 0x00, 0x00, 0x00, 0x01,
  78        0x00, 0x00, 0x00, 0x00, 0x6e, 0x61, 0x6d, 0x65, 0x20, 0x20, 0x20, 0x20,
  79        0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01,
  80        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
  81        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xdf,
  82        0x46, 0x69, 0x6c, 0x65, 0x44, 0x61, 0x74, 0x61, 0x49, 0x50, 0x4d, 0x49,
  83        0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x49, 0x50, 0x4d, 0x49,
  84        0x2d, 0x46, 0x52, 0x55, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
  85        0x20, 0x20, 0x20, 0x01, 0x66, 0x61, 0x6b, 0x65, 0x0a,
  86        },
  87};
  88
  89struct ff_dev {
  90        struct fmc_device *fmc[FF_MAX_MEZZANINES];
  91        struct device dev;
  92};
  93
  94static struct ff_dev *ff_current_dev; /* We have 1 carrier, 1 slot */
  95
  96static int ff_reprogram(struct fmc_device *fmc, struct fmc_driver *drv,
  97                          char *gw)
  98{
  99        const struct firmware *fw;
 100        int ret;
 101
 102        if (!gw) {
 103                /* program golden: success */
 104                fmc->flags &= ~FMC_DEVICE_HAS_CUSTOM;
 105                fmc->flags |= FMC_DEVICE_HAS_GOLDEN;
 106                return 0;
 107        }
 108
 109        dev_info(&fmc->dev, "reprogramming with %s\n", gw);
 110        ret = request_firmware(&fw, gw, &fmc->dev);
 111        if (ret < 0) {
 112                dev_warn(&fmc->dev, "request firmware \"%s\": error %i\n",
 113                         gw, ret);
 114                goto out;
 115        }
 116        fmc->flags &= ~FMC_DEVICE_HAS_GOLDEN;
 117        fmc->flags |= FMC_DEVICE_HAS_CUSTOM;
 118
 119out:
 120        release_firmware(fw);
 121        return ret;
 122}
 123
 124static int ff_irq_request(struct fmc_device *fmc, irq_handler_t handler,
 125                            char *name, int flags)
 126{
 127        return -EOPNOTSUPP;
 128}
 129
 130/* FIXME: should also have some fake FMC GPIO mapping */
 131
 132
 133/*
 134 * This work function is called when we changed the eeprom. It removes the
 135 * current fmc device and registers a new one, with different identifiers.
 136 */
 137static struct ff_dev *ff_dev_create(void); /* defined later */
 138
 139static void ff_work_fn(struct work_struct *work)
 140{
 141        struct ff_dev *ff = ff_current_dev;
 142        int ret;
 143
 144        fmc_device_unregister_n(ff->fmc, ff_nr_dev);
 145        device_unregister(&ff->dev);
 146        ff_current_dev = NULL;
 147
 148        ff = ff_dev_create();
 149        if (IS_ERR(ff)) {
 150                pr_warning("%s: can't re-create FMC devices\n", __func__);
 151                return;
 152        }
 153        ret = fmc_device_register_n(ff->fmc, ff_nr_dev);
 154        if (ret < 0) {
 155                dev_warn(&ff->dev, "can't re-register FMC devices\n");
 156                device_unregister(&ff->dev);
 157                return;
 158        }
 159
 160        ff_current_dev = ff;
 161}
 162
 163static DECLARE_DELAYED_WORK(ff_work, ff_work_fn);
 164
 165
 166/* low-level i2c */
 167static int ff_eeprom_read(struct fmc_device *fmc, uint32_t offset,
 168                void *buf, size_t size)
 169{
 170        if (offset > FF_EEPROM_SIZE)
 171                return -EINVAL;
 172        if (offset + size > FF_EEPROM_SIZE)
 173                size = FF_EEPROM_SIZE - offset;
 174        memcpy(buf, fmc->eeprom + offset, size);
 175        return size;
 176}
 177
 178static int ff_eeprom_write(struct fmc_device *fmc, uint32_t offset,
 179                    const void *buf, size_t size)
 180{
 181        if (offset > FF_EEPROM_SIZE)
 182                return -EINVAL;
 183        if (offset + size > FF_EEPROM_SIZE)
 184                size = FF_EEPROM_SIZE - offset;
 185        dev_info(&fmc->dev, "write_eeprom: offset %i, size %zi\n",
 186                 (int)offset, size);
 187        memcpy(fmc->eeprom + offset, buf, size);
 188        schedule_delayed_work(&ff_work, HZ * 2); /* remove, replug, in 2s */
 189        return size;
 190}
 191
 192/* i2c operations for fmc */
 193static int ff_read_ee(struct fmc_device *fmc, int pos, void *data, int len)
 194{
 195        if (!(fmc->flags & FMC_DEVICE_HAS_GOLDEN))
 196                return -EOPNOTSUPP;
 197        return ff_eeprom_read(fmc, pos, data, len);
 198}
 199
 200static int ff_write_ee(struct fmc_device *fmc, int pos,
 201                         const void *data, int len)
 202{
 203        if (!(fmc->flags & FMC_DEVICE_HAS_GOLDEN))
 204                return -EOPNOTSUPP;
 205        return ff_eeprom_write(fmc, pos, data, len);
 206}
 207
 208/* readl and writel do not do anything. Don't waste RAM with "base" */
 209static uint32_t ff_readl(struct fmc_device *fmc, int offset)
 210{
 211        return 0;
 212}
 213
 214static void ff_writel(struct fmc_device *fmc, uint32_t value, int offset)
 215{
 216        return;
 217}
 218
 219/* validate is useful so fmc-write-eeprom will not reprogram every 2 seconds */
 220static int ff_validate(struct fmc_device *fmc, struct fmc_driver *drv)
 221{
 222        int i;
 223
 224        if (!drv->busid_n)
 225                return 0; /* everyhing is valid */
 226        for (i = 0; i < drv->busid_n; i++)
 227                if (drv->busid_val[i] == fmc->device_id)
 228                        return i;
 229        return -ENOENT;
 230}
 231
 232
 233
 234static struct fmc_operations ff_fmc_operations = {
 235        .read32 =               ff_readl,
 236        .write32 =              ff_writel,
 237        .reprogram =            ff_reprogram,
 238        .irq_request =          ff_irq_request,
 239        .read_ee =              ff_read_ee,
 240        .write_ee =             ff_write_ee,
 241        .validate =             ff_validate,
 242};
 243
 244/* This device is kmalloced: release it */
 245static void ff_dev_release(struct device *dev)
 246{
 247        struct ff_dev *ff = container_of(dev, struct ff_dev, dev);
 248        kfree(ff);
 249}
 250
 251static struct fmc_device ff_template_fmc = {
 252        .version = FMC_VERSION,
 253        .owner = THIS_MODULE,
 254        .carrier_name = "fake-fmc-carrier",
 255        .device_id = 0xf001, /* fool */
 256        .eeprom_len = sizeof(ff_eeimg[0]),
 257        .memlen = 0x1000, /* 4k, to show something */
 258        .op = &ff_fmc_operations,
 259        .hwdev = NULL, /* filled at creation time */
 260        .flags = FMC_DEVICE_HAS_GOLDEN,
 261};
 262
 263static struct ff_dev *ff_dev_create(void)
 264{
 265        struct ff_dev *ff;
 266        struct fmc_device *fmc;
 267        int i, ret;
 268
 269        ff = kzalloc(sizeof(*ff), GFP_KERNEL);
 270        if (!ff)
 271                return ERR_PTR(-ENOMEM);
 272        dev_set_name(&ff->dev, "fake-fmc-carrier");
 273        ff->dev.release = ff_dev_release;
 274
 275        ret = device_register(&ff->dev);
 276        if (ret < 0) {
 277                put_device(&ff->dev);
 278                return ERR_PTR(ret);
 279        }
 280
 281        /* Create fmc structures that refer to this new "hw" device */
 282        for (i = 0; i < ff_nr_dev; i++) {
 283                fmc = kmemdup(&ff_template_fmc, sizeof(ff_template_fmc),
 284                              GFP_KERNEL);
 285                fmc->hwdev = &ff->dev;
 286                fmc->carrier_data = ff;
 287                fmc->nr_slots = ff_nr_dev;
 288                /* the following fields are different for each slot */
 289                fmc->eeprom = ff_eeimg[i];
 290                fmc->eeprom_addr = 0x50 + 2 * i;
 291                fmc->slot_id = i;
 292                ff->fmc[i] = fmc;
 293                /* increment the identifier, each must be different */
 294                ff_template_fmc.device_id++;
 295        }
 296        return ff;
 297}
 298
 299/* init and exit */
 300static int ff_init(void)
 301{
 302        struct ff_dev *ff;
 303        const struct firmware *fw;
 304        int i, len, ret = 0;
 305
 306        /* Replicate the default eeprom for the max number of mezzanines */
 307        for (i = 1; i < FF_MAX_MEZZANINES; i++)
 308                memcpy(ff_eeimg[i], ff_eeimg[0], sizeof(ff_eeimg[0]));
 309
 310        if (ff_nr_eeprom > ff_nr_dev)
 311                ff_nr_dev = ff_nr_eeprom;
 312
 313        ff = ff_dev_create();
 314        if (IS_ERR(ff))
 315                return PTR_ERR(ff);
 316
 317        /* If the user passed "eeprom=" as a parameter, fetch them */
 318        for (i = 0; i < ff_nr_eeprom; i++) {
 319                if (!strlen(ff_eeprom[i]))
 320                        continue;
 321                ret = request_firmware(&fw, ff_eeprom[i], &ff->dev);
 322                if (ret < 0) {
 323                        dev_err(&ff->dev, "Mezzanine %i: can't load \"%s\" "
 324                                "(error %i)\n", i, ff_eeprom[i], -ret);
 325                } else {
 326                        len = min_t(size_t, fw->size, (size_t)FF_EEPROM_SIZE);
 327                        memcpy(ff_eeimg[i], fw->data, len);
 328                        release_firmware(fw);
 329                        dev_info(&ff->dev, "Mezzanine %i: eeprom \"%s\"\n", i,
 330                                ff_eeprom[i]);
 331                }
 332        }
 333
 334        ret = fmc_device_register_n(ff->fmc, ff_nr_dev);
 335        if (ret) {
 336                device_unregister(&ff->dev);
 337                return ret;
 338        }
 339        ff_current_dev = ff;
 340        return ret;
 341}
 342
 343static void ff_exit(void)
 344{
 345        if (ff_current_dev) {
 346                fmc_device_unregister_n(ff_current_dev->fmc, ff_nr_dev);
 347                device_unregister(&ff_current_dev->dev);
 348        }
 349        cancel_delayed_work_sync(&ff_work);
 350}
 351
 352module_init(ff_init);
 353module_exit(ff_exit);
 354
 355MODULE_LICENSE("Dual BSD/GPL");
 356
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