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
  19 struct fmc_device;
  20 struct 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  */
  43 struct 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  */
  55 struct fmc_sdb_one_id {
  56         uint64_t vendor;
  57         uint32_t device;
  58 };
  59 struct fmc_sdb_id {
  60         struct fmc_sdb_one_id *cores;
  61         int cores_nr;
  62 };
  63
  64 struct 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 */
  75 struct 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  */
 100 struct 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  */
 131 struct 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 */
 147 extern 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  */
 158 struct 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  */
 195 static 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 }
 201 static 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 */
 210 static inline void *fmc_get_drvdata(const struct fmc_device *fmc)
 211 {
 212         return dev_get_drvdata(&fmc->dev);
 213 }
 214
 215 static 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 */
 221 extern int fmc_driver_register(struct fmc_driver *drv);
 222 extern void fmc_driver_unregister(struct fmc_driver *drv);
 223 extern int fmc_device_register(struct fmc_device *tdev);
 224 extern void fmc_device_unregister(struct fmc_device *tdev);
 225
 226 /* Two more for device sets, all driven by the same FPGA */
 227 extern int fmc_device_register_n(struct fmc_device **devs, int n);
 228 extern void fmc_device_unregister_n(struct fmc_device **devs, int n);
 229
 230 /* Internal cross-calls between files; not exported to other modules */
 231 extern int fmc_match(struct device *dev, struct device_driver *drv);
 232 extern int fmc_fill_id_info(struct fmc_device *fmc);
 233 extern void fmc_free_id_info(struct fmc_device *fmc);
 234 extern void fmc_dump_eeprom(const struct fmc_device *fmc);
 235 extern void fmc_dump_sdb(const struct fmc_device *fmc);
 236
 237 #endif /* __LINUX_FMC_H__ */