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M7350/kernel/drivers/fmc/fmc-fakedev.c
T f75098198c M7350v5_en_gpl
2024-09-09 08:57:42 +00:00

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/*
* 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,
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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");
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