include/linux/fmc.h - kernel/bruno - Git at Google

 /*
  * Copyright (C) 2012 CERN (www.cern.ch)
  * Author: Alessandro Rubini <rubini@gnudd.com>
  *
  * 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_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)(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 */
 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;
 };
 #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);
 }

 /* The 4 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 void fmc_device_unregister(struct fmc_device *tdev);

 /* Two more for device sets, all driven by the same FPGA */
 extern int fmc_device_register_n(struct fmc_device **devs, int n);
 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);
 extern void fmc_dump_sdb(const struct fmc_device *fmc);

 #endif /* __LINUX_FMC_H__ */
	/*
	* Copyright (C) 2012 CERN (www.cern.ch)
	* Author: Alessandro Rubini <rubini@gnudd.com>
	*
	* 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_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)(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 */
	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;
	};
	#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);
	}

	/* The 4 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 void fmc_device_unregister(struct fmc_device *tdev);

	/* Two more for device sets, all driven by the same FPGA */
	extern int fmc_device_register_n(struct fmc_device **devs, int n);
	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);
	extern void fmc_dump_sdb(const struct fmc_device *fmc);

	#endif /* __LINUX_FMC_H__ */