ambapp.h

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/* SPDX-License-Identifier: BSD-2-Clause */

 
/*
 *  COPYRIGHT (c) 2009.
 *  Aeroflex Gaisler.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef __AMBAPP_H__
#define __AMBAPP_H__
 
#include <stddef.h>
 
/* Include VENDOR and DEVICE definitions */
#include "ambapp_ids.h"
 
#ifdef __cplusplus
extern "C" {
#endif

 
/* Max supported AHB buses */
#define AHB_BUS_MAX 6
 
#define AMBAPP_FLAG_FFACT_DIR   0x100   /* Frequency factor direction, 0=down, 1=up */
#define AMBAPP_FLAG_FFACT   0x0f0   /* Frequency factor against top bus */
#define AMBAPP_FLAG_MBUS    0x00c
#define AMBAPP_FLAG_SBUS    0x003
 
/* Get APB or AHB information from a AMBA device */
#define DEV_TO_APB(adev) ((struct ambapp_apb_info *)((adev)->devinfo))
#define DEV_TO_AHB(adev) ((struct ambapp_ahb_info *)((adev)->devinfo))
#define DEV_TO_COMMON(adev) (((adev)->devinfo))
 
struct ambapp_common_info {
    unsigned char irq;
    unsigned char ver;
    unsigned char ahbidx;   /* AHB Bus Index */
};
 
struct ambapp_apb_info {
    struct ambapp_common_info common;
 
    /* APB SPECIFIC */
    unsigned int start;
    unsigned int mask;
};
 
struct ambapp_ahb_info {
    struct ambapp_common_info common;
 
    /* AHB SPECIFIC */
    unsigned int start[4];
    unsigned int mask[4];
    char type[4];       /* type[N] Determine type of start[N]-mask[N],
                 * 2=AHB Memory Space, 3=AHB I/O Space */
    unsigned int custom[3];
};
 
struct ambapp_dev {
    struct ambapp_dev *next;    /* Next */
    struct ambapp_dev *prev;    /* Previous Device. If (this ==
                     * rev->child) prev is bus bridge */
    struct ambapp_dev *children;    /* Points to first device on sub-bus */
    void *owner;            /* Owner of this AMBA device */
    unsigned char dev_type;     /* AHB MST, AHB SLV or APB SLV*/
    unsigned char vendor;       /* Vendor ID */
    unsigned short device;      /* Device ID */
 
    /* Device info (APB/AHB dep. on type) */
    struct ambapp_common_info devinfo[0];
};
 
/* Describes a complete AMBA Core. Each device may consist of 3 interfaces */
struct ambapp_core {
    char            irq;        /* irq=-1 indicate no IRQ */
    unsigned char       vendor;
    unsigned short      device;
    int         index;      /* Core index */
    struct ambapp_ahb_info  *ahb_mst;
    struct ambapp_ahb_info  *ahb_slv;
    struct ambapp_apb_info  *apb_slv;
};
 
struct ambapp_ahb_bus {
    unsigned int ioarea;    /* AHB Bus IOAREA */
    unsigned int freq_hz;   /* Frequency of AHB Bus */
    struct ambapp_dev *bridge;/* Bridge Device on Parent AHB Bus */
    struct ambapp_dev *dev; /* First Device on AHB Bus */
};
 
struct ambapp_mmap {
    unsigned int        size;
    unsigned int        local_adr;
    unsigned int        remote_adr;
};
 
/* Complete AMBA PnP information */
struct ambapp_bus {
    struct ambapp_dev   *root;          /* AHB/APB Device Tree*/
    struct ambapp_mmap  *mmaps;         /* Memory MAP Array */
    struct ambapp_ahb_bus   ahbs[AHB_BUS_MAX];  /* AHB Buses */
};
 
/* 
 * Return values
 *  0 - continue
 *  1 - stop scanning
 */
typedef int (*ambapp_func_t)(struct ambapp_dev *dev, int index, void *arg);
 
#define DEV_IS_FREE(dev) (dev->owner == NULL)
#define DEV_IS_ALLOCATED(dev) (dev->owner != NULL)
 
/* Options to ambapp_for_each */
#define OPTIONS_AHB_MSTS    0x00000001
#define OPTIONS_AHB_SLVS    0x00000002
#define OPTIONS_APB_SLVS    0x00000004
#define OPTIONS_ALL_DEVS    (OPTIONS_AHB_MSTS|OPTIONS_AHB_SLVS|OPTIONS_APB_SLVS)
 
#define OPTIONS_FREE        0x00000010
#define OPTIONS_ALLOCATED   0x00000020
#define OPTIONS_ALL     (OPTIONS_FREE|OPTIONS_ALLOCATED)
 
/* Depth first search, Defualt is breath first search. */
#define OPTIONS_DEPTH_FIRST 0x00000100
 
#define DEV_AHB_NONE 0
#define DEV_AHB_MST  1
#define DEV_AHB_SLV  2
#define DEV_APB_SLV 3
 
/* Structures used to access Plug&Play information directly */
struct ambapp_pnp_ahb {
    const unsigned int  id;     /* VENDOR, DEVICE, VER, IRQ, */
    const unsigned int  custom[3];
    const unsigned int  mbar[4];    /* MASK, ADDRESS, TYPE, CACHABLE/PREFETCHABLE */
};
 
struct ambapp_pnp_apb {
    const unsigned int  id;     /* VENDOR, DEVICE, VER, IRQ, */
    const unsigned int  iobar;      /* MASK, ADDRESS, TYPE, CACHABLE/PREFETCHABLE */
};
 
#define ambapp_pnp_vendor(id) (((id) >> 24) & 0xff)
#define ambapp_pnp_device(id) (((id) >> 12) & 0xfff)
#define ambapp_pnp_ver(id) (((id)>>5) & 0x1f)
#define ambapp_pnp_irq(id) ((id) & 0x1f)
 
#define ambapp_pnp_start(mbar)  (((mbar) & 0xfff00000) & (((mbar) & 0xfff0) << 16)) 
#define ambapp_pnp_mbar_mask(mbar) (((mbar)>>4) & 0xfff)
#define ambapp_pnp_mbar_type(mbar) ((mbar) & 0xf)
 
#define ambapp_pnp_apb_start(iobar, base) ((base) | ((((iobar) & 0xfff00000)>>12) & (((iobar) & 0xfff0)<<4)) )
#define ambapp_pnp_apb_mask(iobar) ((~(ambapp_pnp_mbar_mask(iobar)<<8) & 0x000fffff) + 1)
 
#define AMBA_TYPE_AHBIO_ADDR(addr,base_ioarea) ((unsigned int)(base_ioarea) | ((addr) >> 12))
 
#define AMBA_TYPE_APBIO 0x1
#define AMBA_TYPE_MEM   0x2
#define AMBA_TYPE_AHBIO 0x3
 
/* Copy Data from AMBA PnP I/O Area */
typedef void *(*ambapp_memcpy_t)(
    void *dest,     /* Destination RAM copy */
    const void *src,    /* Source AMBA PnP Address to copy from */
    int n,          /* Number of bytes to be copied */
    struct ambapp_bus *abus /* Optional AMBA Bus pointer */
    );
 
struct ambapp_context {
  ambapp_memcpy_t copy_from_device;
  void *(*alloc)(size_t);
};

extern struct ambapp_bus *ambapp_plb(void);
 
/* Scan a AMBA Plug & Play bus and create all device structures describing the 
 * the devices. The devices will form a tree, where every node describes one
 * interface. The resulting tree is placed in the location pointed to by root.
 *
 * Since it the tree is located in RAM it is easier to work with AMBA buses
 * that is located over PCI and SpaceWire etc.
 *
 * \param abus     Resulting device node tree root is stored here.
 * \param ioarea   The IO-AREA where Plug & Play information can be found.
 * \param ctx      The scan context.  May be NULL.
 * \param mmaps    Is used to perform address translation if needed.
 *
 */
extern int ambapp_scan(
    struct ambapp_bus *abus,
    unsigned int ioarea,
    const struct ambapp_context *ctx,
    struct ambapp_mmap *mmaps
    );
 
/* Initialize the frequency [Hz] of all AHB Buses from knowing the frequency
 * of one particular APB/AHB Device.
 */
extern void ambapp_freq_init(
    struct ambapp_bus *abus,
    struct ambapp_dev *dev,
    unsigned int freq);
 
/* Returns the frequency [Hz] of a AHB/APB device */
extern unsigned int ambapp_freq_get(
    struct ambapp_bus *abus,
    struct ambapp_dev *dev);
 
/* Iterates through all AMBA devices previously found, it calls func 
 * once for every device that match the search arguments.
 *
 * SEARCH OPTIONS
 * All search options must be fulfilled, type of devices searched (options)
 * and AMBA Plug&Play ID [VENDOR,DEVICE], before func() is called. The options
 * can be use to search only for AMBA APB or AHB Slaves or AHB Masters for
 * example. Note that when VENDOR=-1 or DEVICE=-1 it will match any vendor or
 * device ID, this means setting both VENDOR and DEVICE to -1 will result in
 * calling all devices matches the options argument.
 *
 * \param abus     AMBAPP Bus to search
 * \param options  Search options, see OPTIONS_* above
 * \param vendor   AMBAPP VENDOR ID to search for
 * \param device   AMBAPP DEVICE ID to search for
 * \param func     Function called for every device matching search options
 * \param arg      Optional argument passed on to func
 *
 * func return value affects the search, returning a non-zero value will
 * stop the search and ambapp_for_each will return immediately returning the
 * same non-zero value.
 *
 * Return Values
 *  0 - all devices was scanned
 *  non-zero - stopped by user function returning the non-zero value
 */
extern int ambapp_for_each(
    struct ambapp_bus *abus,
    unsigned int options,
    int vendor,
    int device,
    ambapp_func_t func,
    void *arg);
 
/* Helper function for ambapp_for_each(), find a device by index. If pcount
 * is NULL the first device is returned, else pcount is interpreted as index
 * by decrementing the value until zero is reaced: *count=0 first device,
 * *count=1 second device etc.
 *
 * The matching device is returned, which will stop the ambapp_for_each search.
 * If zero is returned from ambapp_for_each no device matching the index was
 * found
 */
extern int ambapp_find_by_idx(struct ambapp_dev *dev, int index, void *pcount);
 
/* Get number of devices matching the options/vendor/device arguments, the
 * arguments are passed onto ambapp_for_each().
 */
extern int ambapp_dev_count(struct ambapp_bus *abus, unsigned int options,
                int vendor, int device);
 
/* Print short information about devices on the AMBA bus onto the console */
extern void ambapp_print(struct ambapp_bus *abus, int show_depth);
 
/* Mark a device taken (allocate), Owner field is set with owner Data. Returns
 * -1 if device has already been allocated.
 */
extern int ambapp_alloc_dev(struct ambapp_dev *dev, void *owner);
 
/* Owner field is cleared, which indicates that device is not allocated */
extern void ambapp_free_dev(struct ambapp_dev *dev);
 
/* Find AHB/APB Bridge or AHB/AHB Bridge Parent */
extern struct ambapp_dev *ambapp_find_parent(struct ambapp_dev *dev);
 
/* Returns bus depth (number of sub AHB buses) of device from root bus */
extern int ambapp_depth(struct ambapp_dev *dev);
 
/* Get Device Name from AMBA PnP name database */
extern char *ambapp_device_id2str(int vendor, int id);
 
/* Get Vendor Name from AMBA PnP name database */
extern char *ambapp_vendor_id2str(int vendor);
 
/* Set together VENDOR_DEVICE Name from AMBA PnP name database. Return length
 * of C-string stored in buf not including string termination '\0'.
 */
extern int ambapp_vendev_id2str(int vendor, int id, char *buf);
 
/* Help functions for backwards compability */
 
extern int ambapp_find_apbslv(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_apb_info *dev);
 
extern int ambapp_find_apbslv_next(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_apb_info *dev,
    int index);
 
extern int ambapp_find_apbslvs_next(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_apb_info *dev,
    int index,
    int maxno);
 
extern int ambapp_find_apbslvs(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_apb_info *dev,
    int maxno);
 
extern int ambapp_find_ahbslv(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_ahb_info *dev);
 
extern int ambapp_find_ahbslv_next(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_ahb_info *dev,
    int index);
 
extern int ambapp_find_ahbslvs_next(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_ahb_info *dev,
    int index,
    int maxno);
 
extern int ambapp_find_ahbslvs(
    struct ambapp_bus *abus,
    int vendor,
    int device,
    struct ambapp_ahb_info *dev,
    int maxno);
 
 
extern int ambapp_get_number_ahbslv_devices(
    struct ambapp_bus *abus,
    int vendor,
    int device);
 
extern int ambapp_get_number_apbslv_devices(
    struct ambapp_bus *abus,
    int vendor,
    int device);
 
#ifdef __cplusplus
}
#endif

 
#endif