diff options
Diffstat (limited to 'drivers/fmc/fmc-fakedev.c')
| -rw-r--r-- | drivers/fmc/fmc-fakedev.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/fmc/fmc-fakedev.c b/drivers/fmc/fmc-fakedev.c new file mode 100644 index 00000000000..941d0930969 --- /dev/null +++ b/drivers/fmc/fmc-fakedev.c @@ -0,0 +1,355 @@ +/* + * Copyright (C) 2012 CERN (www.cern.ch) + * Author: Alessandro Rubini <rubini@gnudd.com> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * The software is provided "as is"; the copyright holders disclaim + * all warranties and liabilities, to the extent permitted by + * applicable law. + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/string.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/firmware.h> +#include <linux/workqueue.h> +#include <linux/err.h> +#include <linux/fmc.h> + +#define FF_EEPROM_SIZE 8192 /* The standard eeprom size */ +#define FF_MAX_MEZZANINES 4 /* Fakes a multi-mezzanine carrier */ + +/* The user can pass up to 4 names of eeprom images to load */ +static char *ff_eeprom[FF_MAX_MEZZANINES]; +static int ff_nr_eeprom; +module_param_array_named(eeprom, ff_eeprom, charp, &ff_nr_eeprom, 0444); + +/* The user can ask for a multi-mezzanine carrier, with the default eeprom */ +static int ff_nr_dev = 1; +module_param_named(ndev, ff_nr_dev, int, 0444); + + +/* Lazily, don't support the "standard" module parameters */ + +/* + * Eeprom built from these commands: + + ../fru-generator -v fake-vendor -n fake-design-for-testing \ + -s 01234 -p none > IPMI-FRU + + gensdbfs . ../fake-eeprom.bin +*/ +static char ff_eeimg[FF_MAX_MEZZANINES][FF_EEPROM_SIZE] = { + { + 0x01, 0x00, 0x00, 0x01, 0x00, 0x0c, 0x00, 0xf2, 0x01, 0x0b, 0x00, 0xb2, + 0x86, 0x87, 0xcb, 0x66, 0x61, 0x6b, 0x65, 0x2d, 0x76, 0x65, 0x6e, 0x64, + 0x6f, 0x72, 0xd7, 0x66, 0x61, 0x6b, 0x65, 0x2d, 0x64, 0x65, 0x73, 0x69, + 0x67, 0x6e, 0x2d, 0x66, 0x6f, 0x72, 0x2d, 0x74, 0x65, 0x73, 0x74, 0x69, + 0x6e, 0x67, 0xc5, 0x30, 0x31, 0x32, 0x33, 0x34, 0xc4, 0x6e, 0x6f, 0x6e, + 0x65, 0xda, 0x32, 0x30, 0x31, 0x32, 0x2d, 0x31, 0x31, 0x2d, 0x31, 0x39, + 0x20, 0x32, 0x32, 0x3a, 0x34, 0x32, 0x3a, 0x33, 0x30, 0x2e, 0x30, 0x37, + 0x34, 0x30, 0x35, 0x35, 0xc1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87, + 0x02, 0x02, 0x0d, 0xf7, 0xf8, 0x02, 0xb0, 0x04, 0x74, 0x04, 0xec, 0x04, + 0x00, 0x00, 0x00, 0x00, 0xe8, 0x03, 0x02, 0x02, 0x0d, 0x5c, 0x93, 0x01, + 0x4a, 0x01, 0x39, 0x01, 0x5a, 0x01, 0x00, 0x00, 0x00, 0x00, 0xb8, 0x0b, + 0x02, 0x02, 0x0d, 0x63, 0x8c, 0x00, 0xfa, 0x00, 0xed, 0x00, 0x06, 0x01, + 0x00, 0x00, 0x00, 0x00, 0xa0, 0x0f, 0x01, 0x02, 0x0d, 0xfb, 0xf5, 0x05, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x01, 0x02, 0x0d, 0xfc, 0xf4, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x0d, 0xfd, 0xf3, 0x03, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0xfa, 0x82, 0x0b, 0xea, 0x8f, 0xa2, 0x12, 0x00, 0x00, 0x1e, 0x44, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x53, 0x44, 0x42, 0x2d, 0x00, 0x03, 0x01, 0x01, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x01, 0xc4, 0x46, 0x69, 0x6c, 0x65, 0x44, 0x61, 0x74, 0x61, + 0x2e, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, + 0x2e, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, + 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc0, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc4, 0x46, 0x69, 0x6c, 0x65, + 0x44, 0x61, 0x74, 0x61, 0x6e, 0x61, 0x6d, 0x65, 0x00, 0x00, 0x00, 0x01, + 0x00, 0x00, 0x00, 0x00, 0x6e, 0x61, 0x6d, 0x65, 0x20, 0x20, 0x20, 0x20, + 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xdf, + 0x46, 0x69, 0x6c, 0x65, 0x44, 0x61, 0x74, 0x61, 0x49, 0x50, 0x4d, 0x49, + 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x49, 0x50, 0x4d, 0x49, + 0x2d, 0x46, 0x52, 0x55, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, + 0x20, 0x20, 0x20, 0x01, 0x66, 0x61, 0x6b, 0x65, 0x0a, + }, +}; + +struct ff_dev { + struct fmc_device *fmc[FF_MAX_MEZZANINES]; + struct device dev; +}; + +static struct ff_dev *ff_current_dev; /* We have 1 carrier, 1 slot */ + +static int ff_reprogram(struct fmc_device *fmc, struct fmc_driver *drv, + char *gw) +{ + const struct firmware *fw; + int ret; + + if (!gw) { + /* program golden: success */ + fmc->flags &= ~FMC_DEVICE_HAS_CUSTOM; + fmc->flags |= FMC_DEVICE_HAS_GOLDEN; + return 0; + } + + dev_info(&fmc->dev, "reprogramming with %s\n", gw); + ret = request_firmware(&fw, gw, &fmc->dev); + if (ret < 0) { + dev_warn(&fmc->dev, "request firmware \"%s\": error %i\n", + gw, ret); + goto out; + } + fmc->flags &= ~FMC_DEVICE_HAS_GOLDEN; + fmc->flags |= FMC_DEVICE_HAS_CUSTOM; + +out: + release_firmware(fw); + return ret; +} + +static int ff_irq_request(struct fmc_device *fmc, irq_handler_t handler, + char *name, int flags) +{ + return -EOPNOTSUPP; +} + +/* FIXME: should also have some fake FMC GPIO mapping */ + + +/* + * This work function is called when we changed the eeprom. It removes the + * current fmc device and registers a new one, with different identifiers. + */ +static struct ff_dev *ff_dev_create(void); /* defined later */ + +static void ff_work_fn(struct work_struct *work) +{ + struct ff_dev *ff = ff_current_dev; + int ret; + + fmc_device_unregister_n(ff->fmc, ff_nr_dev); + device_unregister(&ff->dev); + ff_current_dev = NULL; + + ff = ff_dev_create(); + if (IS_ERR(ff)) { + pr_warning("%s: can't re-create FMC devices\n", __func__); + return; + } + ret = fmc_device_register_n(ff->fmc, ff_nr_dev); + if (ret < 0) { + dev_warn(&ff->dev, "can't re-register FMC devices\n"); + device_unregister(&ff->dev); + return; + } + + ff_current_dev = ff; +} + +static DECLARE_DELAYED_WORK(ff_work, ff_work_fn); + + +/* low-level i2c */ +static int ff_eeprom_read(struct fmc_device *fmc, uint32_t offset, + void *buf, size_t size) +{ + if (offset > FF_EEPROM_SIZE) + return -EINVAL; + if (offset + size > FF_EEPROM_SIZE) + size = FF_EEPROM_SIZE - offset; + memcpy(buf, fmc->eeprom + offset, size); + return size; +} + +static int ff_eeprom_write(struct fmc_device *fmc, uint32_t offset, + const void *buf, size_t size) +{ + if (offset > FF_EEPROM_SIZE) + return -EINVAL; + if (offset + size > FF_EEPROM_SIZE) + size = FF_EEPROM_SIZE - offset; + dev_info(&fmc->dev, "write_eeprom: offset %i, size %zi\n", + (int)offset, size); + memcpy(fmc->eeprom + offset, buf, size); + schedule_delayed_work(&ff_work, HZ * 2); /* remove, replug, in 2s */ + return size; +} + +/* i2c operations for fmc */ +static int ff_read_ee(struct fmc_device *fmc, int pos, void *data, int len) +{ + if (!(fmc->flags & FMC_DEVICE_HAS_GOLDEN)) + return -EOPNOTSUPP; + return ff_eeprom_read(fmc, pos, data, len); +} + +static int ff_write_ee(struct fmc_device *fmc, int pos, + const void *data, int len) +{ + if (!(fmc->flags & FMC_DEVICE_HAS_GOLDEN)) + return -EOPNOTSUPP; + return ff_eeprom_write(fmc, pos, data, len); +} + +/* readl and writel do not do anything. Don't waste RAM with "base" */ +static uint32_t ff_readl(struct fmc_device *fmc, int offset) +{ + return 0; +} + +static void ff_writel(struct fmc_device *fmc, uint32_t value, int offset) +{ + return; +} + +/* validate is useful so fmc-write-eeprom will not reprogram every 2 seconds */ +static int ff_validate(struct fmc_device *fmc, struct fmc_driver *drv) +{ + int i; + + if (!drv->busid_n) + return 0; /* everyhing is valid */ + for (i = 0; i < drv->busid_n; i++) + if (drv->busid_val[i] == fmc->device_id) + return i; + return -ENOENT; +} + + + +static struct fmc_operations ff_fmc_operations = { + .read32 = ff_readl, + .write32 = ff_writel, + .reprogram = ff_reprogram, + .irq_request = ff_irq_request, + .read_ee = ff_read_ee, + .write_ee = ff_write_ee, + .validate = ff_validate, +}; + +/* This device is kmalloced: release it */ +static void ff_dev_release(struct device *dev) +{ + struct ff_dev *ff = container_of(dev, struct ff_dev, dev); + kfree(ff); +} + +static struct fmc_device ff_template_fmc = { + .version = FMC_VERSION, + .owner = THIS_MODULE, + .carrier_name = "fake-fmc-carrier", + .device_id = 0xf001, /* fool */ + .eeprom_len = sizeof(ff_eeimg[0]), + .memlen = 0x1000, /* 4k, to show something */ + .op = &ff_fmc_operations, + .hwdev = NULL, /* filled at creation time */ + .flags = FMC_DEVICE_HAS_GOLDEN, +}; + +static struct ff_dev *ff_dev_create(void) +{ + struct ff_dev *ff; + struct fmc_device *fmc; + int i, ret; + + ff = kzalloc(sizeof(*ff), GFP_KERNEL); + if (!ff) + return ERR_PTR(-ENOMEM); + dev_set_name(&ff->dev, "fake-fmc-carrier"); + ff->dev.release = ff_dev_release; + + ret = device_register(&ff->dev); + if (ret < 0) { + put_device(&ff->dev); + return ERR_PTR(ret); + } + + /* Create fmc structures that refer to this new "hw" device */ + for (i = 0; i < ff_nr_dev; i++) { + fmc = kmemdup(&ff_template_fmc, sizeof(ff_template_fmc), + GFP_KERNEL); + fmc->hwdev = &ff->dev; + fmc->carrier_data = ff; + fmc->nr_slots = ff_nr_dev; + /* the following fields are different for each slot */ + fmc->eeprom = ff_eeimg[i]; + fmc->eeprom_addr = 0x50 + 2 * i; + fmc->slot_id = i; + ff->fmc[i] = fmc; + /* increment the identifier, each must be different */ + ff_template_fmc.device_id++; + } + return ff; +} + +/* init and exit */ +static int ff_init(void) +{ + struct ff_dev *ff; + const struct firmware *fw; + int i, len, ret = 0; + + /* Replicate the default eeprom for the max number of mezzanines */ + for (i = 1; i < FF_MAX_MEZZANINES; i++) + memcpy(ff_eeimg[i], ff_eeimg[0], sizeof(ff_eeimg[0])); + + if (ff_nr_eeprom > ff_nr_dev) + ff_nr_dev = ff_nr_eeprom; + + ff = ff_dev_create(); + if (IS_ERR(ff)) + return PTR_ERR(ff); + + /* If the user passed "eeprom=" as a parameter, fetch them */ + for (i = 0; i < ff_nr_eeprom; i++) { + if (!strlen(ff_eeprom[i])) + continue; + ret = request_firmware(&fw, ff_eeprom[i], &ff->dev); + if (ret < 0) { + dev_err(&ff->dev, "Mezzanine %i: can't load \"%s\" " + "(error %i)\n", i, ff_eeprom[i], -ret); + } else { + len = min_t(size_t, fw->size, (size_t)FF_EEPROM_SIZE); + memcpy(ff_eeimg[i], fw->data, len); + release_firmware(fw); + dev_info(&ff->dev, "Mezzanine %i: eeprom \"%s\"\n", i, + ff_eeprom[i]); + } + } + + ret = fmc_device_register_n(ff->fmc, ff_nr_dev); + if (ret) { + device_unregister(&ff->dev); + return ret; + } + ff_current_dev = ff; + return ret; +} + +static void ff_exit(void) +{ + if (ff_current_dev) { + fmc_device_unregister_n(ff_current_dev->fmc, ff_nr_dev); + device_unregister(&ff_current_dev->dev); + } + cancel_delayed_work_sync(&ff_work); +} + +module_init(ff_init); +module_exit(ff_exit); + +MODULE_LICENSE("Dual BSD/GPL"); |