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* Copyright (C) 2012 CERN (
* Author: Alessandro Rubini <>
* Released according to the GNU GPL, version 2 or any later version.
* This work is part of the White Rabbit project, a research effort led
* by CERN, the European Institute for Nuclear Research.
#ifndef __LINUX_FMC_H__
#define __LINUX_FMC_H__
#include <linux/types.h>
#include <linux/moduleparam.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/io.h>
struct fmc_device;
struct fmc_driver;
* This bus abstraction is developed separately from drivers, so we need
* to check the version of the data structures we receive.
#define FMC_MAJOR 3
#define FMC_MINOR 0
#define __FMC_MAJOR(x) ((x) >> 16)
#define __FMC_MINOR(x) ((x) & 0xffff)
* The device identification, as defined by the IPMI FRU (Field Replaceable
* Unit) includes four different strings to describe the device. Here we
* only match the "Board Manufacturer" and the "Board Product Name",
* ignoring the "Board Serial Number" and "Board Part Number". All 4 are
* expected to be strings, so they are treated as zero-terminated C strings.
* Unspecified string (NULL) means "any", so if both are unspecified this
* is a catch-all driver. So null entries are allowed and we use array
* and length. This is unlike pci and usb that use null-terminated arrays
struct fmc_fru_id {
char *manufacturer;
char *product_name;
* If the FPGA is already programmed (think Etherbone or the second
* SVEC slot), we can match on SDB devices in the memory image. This
* match uses an array of devices that must all be present, and the
* match is based on vendor and device only. Further checks are expected
* to happen in the probe function. Zero means "any" and catch-all is allowed.
struct fmc_sdb_one_id {
uint64_t vendor;
uint32_t device;
struct fmc_sdb_id {
struct fmc_sdb_one_id *cores;
int cores_nr;
struct fmc_device_id {
struct fmc_fru_id *fru_id;
int fru_id_nr;
struct fmc_sdb_id *sdb_id;
int sdb_id_nr;
/* This sizes the module_param_array used by generic module parameters */
#define FMC_MAX_CARDS 32
/* The driver is a pretty simple thing */
struct fmc_driver {
unsigned long version;
struct device_driver driver;
int (*probe)(struct fmc_device *);
int (*remove)(struct fmc_device *);
const struct fmc_device_id id_table;
/* What follows is for generic module parameters */
int busid_n;
int busid_val[FMC_MAX_CARDS];
int gw_n;
char *gw_val[FMC_MAX_CARDS];
#define to_fmc_driver(x) container_of((x), struct fmc_driver, driver)
/* These are the generic parameters, that drivers may instantiate */
#define FMC_PARAM_BUSID(_d) \
module_param_array_named(busid, _d.busid_val, int, &_d.busid_n, 0444)
#define FMC_PARAM_GATEWARE(_d) \
module_param_array_named(gateware, _d.gw_val, charp, &_d.gw_n, 0444)
* Drivers may need to configure gpio pins in the carrier. To read input
* (a very uncommon operation, and definitely not in the hot paths), just
* configure one gpio only and get 0 or 1 as retval of the config method
struct fmc_gpio {
char *carrier_name; /* name or NULL for virtual pins */
int gpio;
int _gpio; /* internal use by the carrier */
int mode; /* GPIOF_DIR_OUT etc, from <linux/gpio.h> */
int irqmode; /* IRQF_TRIGGER_LOW and so on */
/* The numbering of gpio pins allows access to raw pins or virtual roles */
#define FMC_GPIO_RAW(x) (x) /* 4096 of them */
#define __FMC_GPIO_IS_RAW(x) ((x) < 0x1000)
#define FMC_GPIO_IRQ(x) ((x) + 0x1000) /* 256 of them */
#define FMC_GPIO_LED(x) ((x) + 0x1100) /* 256 of them */
#define FMC_GPIO_KEY(x) ((x) + 0x1200) /* 256 of them */
#define FMC_GPIO_TP(x) ((x) + 0x1300) /* 256 of them */
#define FMC_GPIO_USER(x) ((x) + 0x1400) /* 256 of them */
/* We may add SCL and SDA, or other roles if the need arises */
/* GPIOF_DIR_IN etc are missing before 3.0. copy from <linux/gpio.h> */
#ifndef GPIOF_DIR_IN
# define GPIOF_DIR_OUT (0 << 0)
# define GPIOF_DIR_IN (1 << 0)
# define GPIOF_INIT_LOW (0 << 1)
# define GPIOF_INIT_HIGH (1 << 1)
* The operations are offered by each carrier and should make driver
* design completely independent of the carrier. Named GPIO pins may be
* the exception.
struct fmc_operations {
uint32_t (*read32)(struct fmc_device *fmc, int offset);
void (*write32)(struct fmc_device *fmc, uint32_t value, int offset);
int (*validate)(struct fmc_device *fmc, struct fmc_driver *drv);
int (*reprogram_raw)(struct fmc_device *f, struct fmc_driver *d,
void *gw, unsigned long len);
int (*reprogram)(struct fmc_device *f, struct fmc_driver *d, char *gw);
int (*irq_request)(struct fmc_device *fmc, irq_handler_t h,
char *name, int flags);
void (*irq_ack)(struct fmc_device *fmc);
int (*irq_free)(struct fmc_device *fmc);
int (*gpio_config)(struct fmc_device *fmc, struct fmc_gpio *gpio,
int ngpio);
int (*read_ee)(struct fmc_device *fmc, int pos, void *d, int l);
int (*write_ee)(struct fmc_device *fmc, int pos, const void *d, int l);
/* Prefer this helper rather than calling of fmc->reprogram directly */
int fmc_reprogram_raw(struct fmc_device *fmc, struct fmc_driver *d,
void *gw, unsigned long len, int sdb_entry);
extern int fmc_reprogram(struct fmc_device *f, struct fmc_driver *d, char *gw,
int sdb_entry);
* The device reports all information needed to access hw.
* If we have eeprom_len and not contents, the core reads it.
* Then, parsing of identifiers is done by the core which fills fmc_fru_id..
* Similarly a device that must be matched based on SDB cores must
* fill the entry point and the core will scan the bus (FIXME: sdb match)
struct fmc_device {
unsigned long version;
unsigned long flags;
struct module *owner; /* char device must pin it */
struct fmc_fru_id id; /* for EEPROM-based match */
struct fmc_operations *op; /* carrier-provided */
int irq; /* according to host bus. 0 == none */
int eeprom_len; /* Usually 8kB, may be less */
int eeprom_addr; /* 0x50, 0x52 etc */
uint8_t *eeprom; /* Full contents or leading part */
char *carrier_name; /* "SPEC" or similar, for special use */
void *carrier_data; /* "struct spec *" or equivalent */
__iomem void *fpga_base; /* May be NULL (Etherbone) */
__iomem void *slot_base; /* Set by the driver */
struct fmc_device **devarray; /* Allocated by the bus */
int slot_id; /* Index in the slot array */
int nr_slots; /* Number of slots in this carrier */
unsigned long memlen; /* Used for the char device */
struct device dev; /* For Linux use */
struct device *hwdev; /* The underlying hardware device */
unsigned long sdbfs_entry;
struct sdb_array *sdb;
uint32_t device_id; /* Filled by the device */
char *mezzanine_name; /* Defaults to ``fmc'' */
void *mezzanine_data;
struct dentry *dbg_dir;
struct dentry *dbg_sdb_dump;
#define to_fmc_device(x) container_of((x), struct fmc_device, dev)
#define FMC_DEVICE_MATCH_SDB 8 /* fmc-core must scan sdb in fpga */
* If fpga_base can be used, the carrier offers no readl/writel methods, and
* this expands to a single, fast, I/O access.
static inline uint32_t fmc_readl(struct fmc_device *fmc, int offset)
if (unlikely(fmc->op->read32))
return fmc->op->read32(fmc, offset);
return readl(fmc->fpga_base + offset);
static inline void fmc_writel(struct fmc_device *fmc, uint32_t val, int off)
if (unlikely(fmc->op->write32))
fmc->op->write32(fmc, val, off);
writel(val, fmc->fpga_base + off);
/* pci-like naming */
static inline void *fmc_get_drvdata(const struct fmc_device *fmc)
return dev_get_drvdata(&fmc->dev);
static inline void fmc_set_drvdata(struct fmc_device *fmc, void *data)
dev_set_drvdata(&fmc->dev, data);
struct fmc_gateware {
void *bitstream;
unsigned long len;
/* The 5 access points */
extern int fmc_driver_register(struct fmc_driver *drv);
extern void fmc_driver_unregister(struct fmc_driver *drv);
extern int fmc_device_register(struct fmc_device *tdev);
extern int fmc_device_register_gw(struct fmc_device *tdev,
struct fmc_gateware *gw);
extern void fmc_device_unregister(struct fmc_device *tdev);
/* Three more for device sets, all driven by the same FPGA */
extern int fmc_device_register_n(struct fmc_device **devs, int n);
extern int fmc_device_register_n_gw(struct fmc_device **devs, int n,
struct fmc_gateware *gw);
extern void fmc_device_unregister_n(struct fmc_device **devs, int n);
/* Internal cross-calls between files; not exported to other modules */
extern int fmc_match(struct device *dev, struct device_driver *drv);
extern int fmc_fill_id_info(struct fmc_device *fmc);
extern void fmc_free_id_info(struct fmc_device *fmc);
extern void fmc_dump_eeprom(const struct fmc_device *fmc);
/* helpers for FMC operations */
extern int fmc_irq_request(struct fmc_device *fmc, irq_handler_t h,
char *name, int flags);
extern void fmc_irq_free(struct fmc_device *fmc);
extern void fmc_irq_ack(struct fmc_device *fmc);
extern int fmc_validate(struct fmc_device *fmc, struct fmc_driver *drv);
extern int fmc_gpio_config(struct fmc_device *fmc, struct fmc_gpio *gpio,
int ngpio);
extern int fmc_read_ee(struct fmc_device *fmc, int pos, void *d, int l);
extern int fmc_write_ee(struct fmc_device *fmc, int pos, const void *d, int l);
/* helpers for FMC operations */
extern int fmc_irq_request(struct fmc_device *fmc, irq_handler_t h,
char *name, int flags);
extern void fmc_irq_free(struct fmc_device *fmc);
extern void fmc_irq_ack(struct fmc_device *fmc);
extern int fmc_validate(struct fmc_device *fmc, struct fmc_driver *drv);
#endif /* __LINUX_FMC_H__ */