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/*
* MC68360 buffer descriptor allocation routines
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*
* COPYRIGHT (c) 2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems.h>
#include <bsp.h>
#include "m68360.h"
#include <rtems/error.h>
#include "rsPMCQ1.h"
#include <rtems/bspIo.h>
#define DEBUG_PRINT 1
void M360SetupMemory( M68360_t ptr ){
volatile m360_t *m360;
m360 = ptr->m360;
#if DEBUG_PRINT
printk("m360->mcr:0x%08x Q1_360_SIM_MCR:0x%08x\n",
(unsigned int)&(m360->mcr), ((unsigned int)m360+Q1_360_SIM_MCR));
#endif
ptr->bdregions[0].base = (char *)&m360->dpram1[0];
ptr->bdregions[0].size = sizeof m360->dpram1;
ptr->bdregions[0].used = 0;
ptr->bdregions[1].base = (char *)&m360->dpram3[0];
ptr->bdregions[1].size = sizeof m360->dpram3;
ptr->bdregions[1].used = 0;
ptr->bdregions[2].base = (char *)&m360->dpram0[0];
ptr->bdregions[2].size = sizeof m360->dpram0;
ptr->bdregions[2].used = 0;
ptr->bdregions[3].base = (char *)&m360->dpram2[0];
ptr->bdregions[3].size = sizeof m360->dpram2;
ptr->bdregions[3].used = 0;
}
/*
* Send a command to the CPM RISC processer
*/
void *
M360AllocateBufferDescriptors (M68360_t ptr, int count)
{
unsigned int i;
ISR_Level level;
void *bdp = NULL;
unsigned int want = count * sizeof(m360BufferDescriptor_t);
int have;
/*
* Running with interrupts disabled is usually considered bad
* form, but this routine is probably being run as part of an
* initialization sequence so the effect shouldn't be too severe.
*/
_ISR_Disable (level);
for (i = 0 ; i < M360_NUM_DPRAM_REAGONS ; i++) {
/*
* Verify that the region exists.
* This test is necessary since some chips have
* less dual-port RAM.
*/
if (ptr->bdregions[i].used == 0) {
volatile unsigned char *cp = ptr->bdregions[i].base;
*cp = 0xAA;
if (*cp != 0xAA) {
ptr->bdregions[i].used = ptr->bdregions[i].size;
continue;
}
*cp = 0x55;
if (*cp != 0x55) {
ptr->bdregions[i].used = ptr->bdregions[i].size;
continue;
}
*cp = 0x0;
}
have = ptr->bdregions[i].size - ptr->bdregions[i].used;
if (have >= want) {
bdp = ptr->bdregions[i].base + ptr->bdregions[i].used;
ptr->bdregions[i].used += want;
break;
}
}
_ISR_Enable (level);
if (bdp == NULL){
printk("rtems_panic can't allocate %d buffer descriptor(s).\n");
rtems_panic ("Can't allocate %d buffer descriptor(s).\n", count);
}
return bdp;
}
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