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![Alessandro Rubini](/assets/img/avatar_default.png)
This allows easier modification to the eeprom than loading the fmc-write-eeprom module. The carrier driver will refuse writing if the FPGA is not running the golden gateware image, so writing in practice is only available at manufacture/development time. Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
304 lines
7 KiB
C
304 lines
7 KiB
C
/*
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* Copyright (C) 2012 CERN (www.cern.ch)
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* Author: Alessandro Rubini <rubini@gnudd.com>
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*
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* Released according to the GNU GPL, version 2 or any later version.
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*
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* This work is part of the White Rabbit project, a research effort led
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* by CERN, the European Institute for Nuclear Research.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/fmc.h>
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static int fmc_check_version(unsigned long version, const char *name)
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{
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if (__FMC_MAJOR(version) != FMC_MAJOR) {
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pr_err("%s: \"%s\" has wrong major (has %li, expected %i)\n",
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__func__, name, __FMC_MAJOR(version), FMC_MAJOR);
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return -EINVAL;
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}
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if (__FMC_MINOR(version) != FMC_MINOR)
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pr_info("%s: \"%s\" has wrong minor (has %li, expected %i)\n",
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__func__, name, __FMC_MINOR(version), FMC_MINOR);
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return 0;
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}
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static int fmc_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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/* struct fmc_device *fdev = to_fmc_device(dev); */
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/* FIXME: The MODALIAS */
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add_uevent_var(env, "MODALIAS=%s", "fmc");
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return 0;
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}
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static int fmc_probe(struct device *dev)
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{
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struct fmc_driver *fdrv = to_fmc_driver(dev->driver);
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struct fmc_device *fdev = to_fmc_device(dev);
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return fdrv->probe(fdev);
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}
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static int fmc_remove(struct device *dev)
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{
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struct fmc_driver *fdrv = to_fmc_driver(dev->driver);
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struct fmc_device *fdev = to_fmc_device(dev);
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return fdrv->remove(fdev);
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}
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static void fmc_shutdown(struct device *dev)
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{
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/* not implemented but mandatory */
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}
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static struct bus_type fmc_bus_type = {
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.name = "fmc",
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.match = fmc_match,
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.uevent = fmc_uevent,
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.probe = fmc_probe,
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.remove = fmc_remove,
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.shutdown = fmc_shutdown,
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};
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static void fmc_release(struct device *dev)
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{
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struct fmc_device *fmc = container_of(dev, struct fmc_device, dev);
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kfree(fmc);
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}
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/*
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* The eeprom is exported in sysfs, through a binary attribute
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*/
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static ssize_t fmc_read_eeprom(struct file *file, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct device *dev;
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struct fmc_device *fmc;
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int eelen;
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dev = container_of(kobj, struct device, kobj);
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fmc = container_of(dev, struct fmc_device, dev);
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eelen = fmc->eeprom_len;
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if (off > eelen)
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return -ESPIPE;
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if (off == eelen)
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return 0; /* EOF */
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if (off + count > eelen)
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count = eelen - off;
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memcpy(buf, fmc->eeprom + off, count);
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return count;
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}
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static ssize_t fmc_write_eeprom(struct file *file, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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struct device *dev;
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struct fmc_device *fmc;
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dev = container_of(kobj, struct device, kobj);
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fmc = container_of(dev, struct fmc_device, dev);
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return fmc->op->write_ee(fmc, off, buf, count);
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}
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static struct bin_attribute fmc_eeprom_attr = {
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.attr = { .name = "eeprom", .mode = S_IRUGO | S_IWUSR, },
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.size = 8192, /* more or less standard */
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.read = fmc_read_eeprom,
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.write = fmc_write_eeprom,
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};
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/*
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* Functions for client modules follow
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*/
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int fmc_driver_register(struct fmc_driver *drv)
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{
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if (fmc_check_version(drv->version, drv->driver.name))
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return -EINVAL;
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drv->driver.bus = &fmc_bus_type;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL(fmc_driver_register);
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void fmc_driver_unregister(struct fmc_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL(fmc_driver_unregister);
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/*
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* When a device set is registered, all eeproms must be read
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* and all FRUs must be parsed
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*/
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int fmc_device_register_n(struct fmc_device **devs, int n)
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{
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struct fmc_device *fmc, **devarray;
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uint32_t device_id;
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int i, ret = 0;
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if (n < 1)
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return 0;
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/* Check the version of the first data structure (function prints) */
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if (fmc_check_version(devs[0]->version, devs[0]->carrier_name))
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return -EINVAL;
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devarray = kmemdup(devs, n * sizeof(*devs), GFP_KERNEL);
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if (!devarray)
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return -ENOMEM;
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/* Make all other checks before continuing, for all devices */
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for (i = 0; i < n; i++) {
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fmc = devarray[i];
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if (!fmc->hwdev) {
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pr_err("%s: device nr. %i has no hwdev pointer\n",
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__func__, i);
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ret = -EINVAL;
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break;
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}
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if (fmc->flags & FMC_DEVICE_NO_MEZZANINE) {
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dev_info(fmc->hwdev, "absent mezzanine in slot %d\n",
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fmc->slot_id);
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continue;
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}
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if (!fmc->eeprom) {
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dev_err(fmc->hwdev, "no eeprom provided for slot %i\n",
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fmc->slot_id);
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ret = -EINVAL;
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}
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if (!fmc->eeprom_addr) {
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dev_err(fmc->hwdev, "no eeprom_addr for slot %i\n",
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fmc->slot_id);
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ret = -EINVAL;
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}
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if (!fmc->carrier_name || !fmc->carrier_data ||
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!fmc->device_id) {
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dev_err(fmc->hwdev,
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"deivce nr %i: carrier name, "
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"data or dev_id not set\n", i);
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ret = -EINVAL;
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}
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if (ret)
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break;
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}
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if (ret) {
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kfree(devarray);
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return ret;
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}
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/* Validation is ok. Now init and register the devices */
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for (i = 0; i < n; i++) {
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fmc = devarray[i];
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fmc->nr_slots = n; /* each slot must know how many are there */
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fmc->devarray = devarray;
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device_initialize(&fmc->dev);
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fmc->dev.release = fmc_release;
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fmc->dev.parent = fmc->hwdev;
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/* Fill the identification stuff (may fail) */
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fmc_fill_id_info(fmc);
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fmc->dev.bus = &fmc_bus_type;
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/* Name from mezzanine info or carrier info. Or 0,1,2.. */
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device_id = fmc->device_id;
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if (!fmc->mezzanine_name)
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dev_set_name(&fmc->dev, "fmc-%04x", device_id);
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else
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dev_set_name(&fmc->dev, "%s-%04x", fmc->mezzanine_name,
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device_id);
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ret = device_add(&fmc->dev);
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if (ret < 0) {
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dev_err(fmc->hwdev, "Slot %i: Failed in registering "
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"\"%s\"\n", fmc->slot_id, fmc->dev.kobj.name);
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goto out;
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}
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ret = sysfs_create_bin_file(&fmc->dev.kobj, &fmc_eeprom_attr);
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if (ret < 0) {
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dev_err(&fmc->dev, "Failed in registering eeprom\n");
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goto out1;
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}
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/* This device went well, give information to the user */
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fmc_dump_eeprom(fmc);
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fmc_dump_sdb(fmc);
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}
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return 0;
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out1:
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device_del(&fmc->dev);
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out:
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fmc_free_id_info(fmc);
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put_device(&fmc->dev);
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kfree(devarray);
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for (i--; i >= 0; i--) {
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sysfs_remove_bin_file(&devs[i]->dev.kobj, &fmc_eeprom_attr);
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device_del(&devs[i]->dev);
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fmc_free_id_info(devs[i]);
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put_device(&devs[i]->dev);
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}
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return ret;
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}
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EXPORT_SYMBOL(fmc_device_register_n);
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int fmc_device_register(struct fmc_device *fmc)
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{
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return fmc_device_register_n(&fmc, 1);
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}
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EXPORT_SYMBOL(fmc_device_register);
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void fmc_device_unregister_n(struct fmc_device **devs, int n)
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{
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int i;
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if (n < 1)
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return;
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/* Free devarray first, not used by the later loop */
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kfree(devs[0]->devarray);
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for (i = 0; i < n; i++) {
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sysfs_remove_bin_file(&devs[i]->dev.kobj, &fmc_eeprom_attr);
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device_del(&devs[i]->dev);
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fmc_free_id_info(devs[i]);
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put_device(&devs[i]->dev);
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}
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}
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EXPORT_SYMBOL(fmc_device_unregister_n);
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void fmc_device_unregister(struct fmc_device *fmc)
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{
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fmc_device_unregister_n(&fmc, 1);
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}
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EXPORT_SYMBOL(fmc_device_unregister);
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/* Init and exit are trivial */
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static int fmc_init(void)
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{
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return bus_register(&fmc_bus_type);
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}
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static void fmc_exit(void)
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{
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bus_unregister(&fmc_bus_type);
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}
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module_init(fmc_init);
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module_exit(fmc_exit);
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MODULE_LICENSE("GPL");
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