amba_driver.c

这是leon3处理器的交叉编译链

/*

    LEON2/3 LIBIO low-level routines 
    Written by Jiri Gaisler.
    Copyright (C) 2004  Gaisler Research AB

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/


#include <asm-leon/leon.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/*#define DEBUG_CONFIG*/

/* Structure containing address to devices found on the Amba Plug&Play bus */
extern amba_confarea_type amba_conf;

/*collect apb slaves*/
int amba_get_free_apbslv_devices(int vendor, int device, amba_apb_device * dev,
				 int nr)
{
	unsigned int i, conf, iobar, j = 0;
#ifdef DEBUG_CONFIG
	printf("Apbslv: search for apdslv devices\n");
#endif
	for (i = 0; i < amba_conf.apbslv.devnr && j < nr; i++) {
		conf = amba_get_confword(amba_conf.apbslv, i, 0);
#ifdef DEBUG_CONFIG
		printf("Apbslv: check(%x:%x)==(%x:%x)\n", vendor, device,
		       amba_vendor(conf), amba_device(conf));
#endif
		if ((amba_vendor(conf) == vendor)
		    && (amba_device(conf) == device)) {
			if (!
			    (amba_conf.apbslv.
			     allocbits[i / 32] & (1 << (i & (32 - 1))))) {
#ifdef DEBUG_CONFIG
				printf("Apbslv: alloc device idx %i (%x:%x)\n",
				       j, vendor, device);
#endif
				amba_conf.apbslv.allocbits[i / 32] |=
				    (1 << (i & (32 - 1)));
				dev[j].irq = amba_irq(conf);
				iobar =
				    amba_apb_get_membar(amba_conf.apbslv, i);
				dev[j].start =
				    amba_iobar_start(amba_conf.apbmst, iobar);
#ifdef DEBUG_CONFIG
				printf(" +bar: 0x%x \n", k, dev[j].start);
#endif
				j++;
			}
		}
	}
	return j;
}

/*collect ahb slaves*/
int amba_get_free_ahbslv_devices(int vendor, int device, amba_ahb_device * dev,
				 int nr)
{
	unsigned int addr, i, conf, iobar, j = 0, k;
#ifdef DEBUG_CONFIG
	printf("Ahbslv: search for ahdslv devices\n");
#endif
	for (i = 0; i < amba_conf.ahbslv.devnr && j < nr; i++) {
		conf = amba_get_confword(amba_conf.ahbslv, i, 0);
#ifdef DEBUG_CONFIG
		printf("Ahbslv: check(%x:%x)==(%x:%x)\n", vendor, device,
		       amba_vendor(conf), amba_device(conf));
#endif
		if ((amba_vendor(conf) == vendor)
		    && (amba_device(conf) == device)) {
			if (!
			    (amba_conf.ahbslv.
			     allocbits[i / 32] & (1 << (i & (32 - 1))))) {
#ifdef DEBUG_CONFIG
				printf("Ahbslv: alloc device idx %i (%x:%x)\n",
				       j, vendor, device);
#endif
				amba_conf.ahbslv.allocbits[i / 32] |=
				    (1 << (i & (32 - 1)));
				dev[j].irq = amba_irq(conf);
				for (k = 0; k < 4; k++) {
					iobar =
					    amba_ahb_get_membar(amba_conf.
								ahbslv, i, k);
					addr = amba_membar_start(iobar);
					if (amba_membar_type(iobar) ==
					    AMBA_TYPE_AHBIO) {
						addr =
						    AMBA_TYPE_AHBIO_ADDR(addr);
					}
					dev[j].start[k] = addr;
#ifdef DEBUG_CONFIG
					printf(" +%i: 0x%x \n", k,
					       dev[j].start[k]);
#endif
				}
				j++;
			}
		}
	}
	return j;
}