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