LXR linux/include/linux/fmc.h

   1/*
   2 * Copyright (C) 2012 CERN (www.cern.ch)
   3 * Author: Alessandro Rubini <rubini@gnudd.com>
   4 *
   5 * Released according to the GNU GPL, version 2 or any later version.
   6 *
   7 * This work is part of the White Rabbit project, a research effort led
   8 * by CERN, the European Institute for Nuclear Research.
   9 */
  10#ifndef __LINUX_FMC_H__
  11#define __LINUX_FMC_H__
  12#include <linux/types.h>
  13#include <linux/moduleparam.h>
  14#include <linux/device.h>
  15#include <linux/list.h>
  16#include <linux/interrupt.h>
  17#include <linux/io.h>
  18
  19struct fmc_device;
  20struct fmc_driver;
  21
  22/*
  23 * This bus abstraction is developed separately from drivers, so we need
  24 * to check the version of the data structures we receive.
  25 */
  26
  27#define FMC_MAJOR       3
  28#define FMC_MINOR       0
  29#define FMC_VERSION     ((FMC_MAJOR << 16) | FMC_MINOR)
  30#define __FMC_MAJOR(x)  ((x) >> 16)
  31#define __FMC_MINOR(x)  ((x) & 0xffff)
  32
  33/*
  34 * The device identification, as defined by the IPMI FRU (Field Replaceable
  35 * Unit) includes four different strings to describe the device. Here we
  36 * only match the "Board Manufacturer" and the "Board Product Name",
  37 * ignoring the "Board Serial Number" and "Board Part Number". All 4 are
  38 * expected to be strings, so they are treated as zero-terminated C strings.
  39 * Unspecified string (NULL) means "any", so if both are unspecified this
  40 * is a catch-all driver. So null entries are allowed and we use array
  41 * and length. This is unlike pci and usb that use null-terminated arrays
  42 */
  43struct fmc_fru_id {
  44        char *manufacturer;
  45        char *product_name;
  46};
  47
  48/*
  49 * If the FPGA is already programmed (think Etherbone or the second
  50 * SVEC slot), we can match on SDB devices in the memory image. This
  51 * match uses an array of devices that must all be present, and the
  52 * match is based on vendor and device only. Further checks are expected
  53 * to happen in the probe function. Zero means "any" and catch-all is allowed.
  54 */
  55struct fmc_sdb_one_id {
  56        uint64_t vendor;
  57        uint32_t device;
  58};
  59struct fmc_sdb_id {
  60        struct fmc_sdb_one_id *cores;
  61        int cores_nr;
  62};
  63
  64struct fmc_device_id {
  65        struct fmc_fru_id *fru_id;
  66        int fru_id_nr;
  67        struct fmc_sdb_id *sdb_id;
  68        int sdb_id_nr;
  69};
  70
  71/* This sizes the module_param_array used by generic module parameters */
  72#define FMC_MAX_CARDS 32
  73
  74/* The driver is a pretty simple thing */
  75struct fmc_driver {
  76        unsigned long version;
  77        struct device_driver driver;
  78        int (*probe)(struct fmc_device *);
  79        int (*remove)(struct fmc_device *);
  80        const struct fmc_device_id id_table;
  81        /* What follows is for generic module parameters */
  82        int busid_n;
  83        int busid_val[FMC_MAX_CARDS];
  84        int gw_n;
  85        char *gw_val[FMC_MAX_CARDS];
  86};
  87#define to_fmc_driver(x) container_of((x), struct fmc_driver, driver)
  88
  89/* These are the generic parameters, that drivers may instantiate */
  90#define FMC_PARAM_BUSID(_d) \
  91    module_param_array_named(busid, _d.busid_val, int, &_d.busid_n, 0444)
  92#define FMC_PARAM_GATEWARE(_d) \
  93    module_param_array_named(gateware, _d.gw_val, charp, &_d.gw_n, 0444)
  94
  95/*
  96 * Drivers may need to configure gpio pins in the carrier. To read input
  97 * (a very uncommon operation, and definitely not in the hot paths), just
  98 * configure one gpio only and get 0 or 1 as retval of the config method
  99 */
 100struct fmc_gpio {
 101        char *carrier_name; /* name or NULL for virtual pins */
 102        int gpio;
 103        int _gpio;      /* internal use by the carrier */
 104        int mode;       /* GPIOF_DIR_OUT etc, from <linux/gpio.h> */
 105        int irqmode;    /* IRQF_TRIGGER_LOW and so on */
 106};
 107
 108/* The numbering of gpio pins allows access to raw pins or virtual roles */
 109#define FMC_GPIO_RAW(x)         (x)             /* 4096 of them */
 110#define __FMC_GPIO_IS_RAW(x)    ((x) < 0x1000)
 111#define FMC_GPIO_IRQ(x)         ((x) + 0x1000)  /*  256 of them */
 112#define FMC_GPIO_LED(x)         ((x) + 0x1100)  /*  256 of them */
 113#define FMC_GPIO_KEY(x)         ((x) + 0x1200)  /*  256 of them */
 114#define FMC_GPIO_TP(x)          ((x) + 0x1300)  /*  256 of them */
 115#define FMC_GPIO_USER(x)        ((x) + 0x1400)  /*  256 of them */
 116/* We may add SCL and SDA, or other roles if the need arises */
 117
 118/* GPIOF_DIR_IN etc are missing before 3.0. copy from <linux/gpio.h> */
 119#ifndef GPIOF_DIR_IN
 120#  define GPIOF_DIR_OUT   (0 << 0)
 121#  define GPIOF_DIR_IN    (1 << 0)
 122#  define GPIOF_INIT_LOW  (0 << 1)
 123#  define GPIOF_INIT_HIGH (1 << 1)
 124#endif
 125
 126/*
 127 * The operations are offered by each carrier and should make driver
 128 * design completely independent of the carrier. Named GPIO pins may be
 129 * the exception.
 130 */
 131struct fmc_operations {
 132        uint32_t (*read32)(struct fmc_device *fmc, int offset);
 133        void (*write32)(struct fmc_device *fmc, uint32_t value, int offset);
 134        int (*validate)(struct fmc_device *fmc, struct fmc_driver *drv);
 135        int (*reprogram)(struct fmc_device *f, struct fmc_driver *d, char *gw);
 136        int (*irq_request)(struct fmc_device *fmc, irq_handler_t h,
 137                           char *name, int flags);
 138        void (*irq_ack)(struct fmc_device *fmc);
 139        int (*irq_free)(struct fmc_device *fmc);
 140        int (*gpio_config)(struct fmc_device *fmc, struct fmc_gpio *gpio,
 141                           int ngpio);
 142        int (*read_ee)(struct fmc_device *fmc, int pos, void *d, int l);
 143        int (*write_ee)(struct fmc_device *fmc, int pos, const void *d, int l);
 144};
 145
 146/* Prefer this helper rather than calling of fmc->reprogram directly */
 147extern int fmc_reprogram(struct fmc_device *f, struct fmc_driver *d, char *gw,
 148                     int sdb_entry);
 149
 150/*
 151 * The device reports all information needed to access hw.
 152 *
 153 * If we have eeprom_len and not contents, the core reads it.
 154 * Then, parsing of identifiers is done by the core which fills fmc_fru_id..
 155 * Similarly a device that must be matched based on SDB cores must
 156 * fill the entry point and the core will scan the bus (FIXME: sdb match)
 157 */
 158struct fmc_device {
 159        unsigned long version;
 160        unsigned long flags;
 161        struct module *owner;           /* char device must pin it */
 162        struct fmc_fru_id id;           /* for EEPROM-based match */
 163        struct fmc_operations *op;      /* carrier-provided */
 164        int irq;                        /* according to host bus. 0 == none */
 165        int eeprom_len;                 /* Usually 8kB, may be less */
 166        int eeprom_addr;                /* 0x50, 0x52 etc */
 167        uint8_t *eeprom;                /* Full contents or leading part */
 168        char *carrier_name;             /* "SPEC" or similar, for special use */
 169        void *carrier_data;             /* "struct spec *" or equivalent */
 170        __iomem void *fpga_base;        /* May be NULL (Etherbone) */
 171        __iomem void *slot_base;        /* Set by the driver */
 172        struct fmc_device **devarray;   /* Allocated by the bus */
 173        int slot_id;                    /* Index in the slot array */
 174        int nr_slots;                   /* Number of slots in this carrier */
 175        unsigned long memlen;           /* Used for the char device */
 176        struct device dev;              /* For Linux use */
 177        struct device *hwdev;           /* The underlying hardware device */
 178        unsigned long sdbfs_entry;
 179        struct sdb_array *sdb;
 180        uint32_t device_id;             /* Filled by the device */
 181        char *mezzanine_name;           /* Defaults to ``fmc'' */
 182        void *mezzanine_data;
 183};
 184#define to_fmc_device(x) container_of((x), struct fmc_device, dev)
 185
 186#define FMC_DEVICE_HAS_GOLDEN           1
 187#define FMC_DEVICE_HAS_CUSTOM           2
 188#define FMC_DEVICE_NO_MEZZANINE         4
 189#define FMC_DEVICE_MATCH_SDB            8 /* fmc-core must scan sdb in fpga */
 190
 191/*
 192 * If fpga_base can be used, the carrier offers no readl/writel methods, and
 193 * this expands to a single, fast, I/O access.
 194 */
 195static inline uint32_t fmc_readl(struct fmc_device *fmc, int offset)
 196{
 197        if (unlikely(fmc->op->read32))
 198                return fmc->op->read32(fmc, offset);
 199        return readl(fmc->fpga_base + offset);
 200}
 201static inline void fmc_writel(struct fmc_device *fmc, uint32_t val, int off)
 202{
 203        if (unlikely(fmc->op->write32))
 204                fmc->op->write32(fmc, val, off);
 205        else
 206                writel(val, fmc->fpga_base + off);
 207}
 208
 209/* pci-like naming */
 210static inline void *fmc_get_drvdata(const struct fmc_device *fmc)
 211{
 212        return dev_get_drvdata(&fmc->dev);
 213}
 214
 215static inline void fmc_set_drvdata(struct fmc_device *fmc, void *data)
 216{
 217        dev_set_drvdata(&fmc->dev, data);
 218}
 219
 220/* The 4 access points */
 221extern int fmc_driver_register(struct fmc_driver *drv);
 222extern void fmc_driver_unregister(struct fmc_driver *drv);
 223extern int fmc_device_register(struct fmc_device *tdev);
 224extern void fmc_device_unregister(struct fmc_device *tdev);
 225
 226/* Two more for device sets, all driven by the same FPGA */
 227extern int fmc_device_register_n(struct fmc_device **devs, int n);
 228extern void fmc_device_unregister_n(struct fmc_device **devs, int n);
 229
 230/* Internal cross-calls between files; not exported to other modules */
 231extern int fmc_match(struct device *dev, struct device_driver *drv);
 232extern int fmc_fill_id_info(struct fmc_device *fmc);
 233extern void fmc_free_id_info(struct fmc_device *fmc);
 234extern void fmc_dump_eeprom(const struct fmc_device *fmc);
 235extern void fmc_dump_sdb(const struct fmc_device *fmc);
 236
 237#endif /* __LINUX_FMC_H__ */
 238