270 lines
9.6 KiB
C
270 lines
9.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* Copyright (C) 2012 CERN (www.cern.ch)
|
|
* Author: Alessandro Rubini <rubini@gnudd.com>
|
|
*
|
|
* 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_VERSION ((FMC_MAJOR << 16) | FMC_MINOR)
|
|
#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)
|
|
#endif
|
|
|
|
/*
|
|
* 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_HAS_GOLDEN 1
|
|
#define FMC_DEVICE_HAS_CUSTOM 2
|
|
#define FMC_DEVICE_NO_MEZZANINE 4
|
|
#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);
|
|
else
|
|
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__ */
|