minix/kernel/arch/earm/omap_padconf.c

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/* Implements sys_padconf() for the AM335X and DM37XX. */
#include "kernel/kernel.h"
#include "arch_proto.h"
#include <sys/types.h>
#include <machine/cpu.h>
#include <minix/mmio.h>
#include <minix/padconf.h>
#include <minix/board.h>
#include <assert.h>
#include <io.h>
#include <stdlib.h>
#include <stdio.h>
#include "omap_padconf.h"
struct omap_padconf
{
vir_bytes base;
vir_bytes offset;
vir_bytes size;
unsigned int board_filter_value;
unsigned int board_filter_mask;
};
static struct omap_padconf omap_padconfs[] = {
{
.base = PADCONF_DM37XX_REGISTERS_BASE,
.offset = PADCONF_DM37XX_REGISTERS_OFFSET,
.size = PADCONF_DM37XX_REGISTERS_SIZE,
.board_filter_value = BOARD_FILTER_BBXM_VALUE,
.board_filter_mask = BOARD_FILTER_BBXM_MASK,
},
{
.base = PADCONF_AM335X_REGISTERS_BASE,
.offset = PADCONF_AM335X_REGISTERS_OFFSET,
.size = PADCONF_AM335X_REGISTERS_SIZE,
.board_filter_value = BOARD_FILTER_BB_VALUE,
.board_filter_mask = BOARD_FILTER_BB_MASK,
},
};
/* initialized in init */
static struct omap_padconf *omap_padconf;
static kern_phys_map padconf_phys_map;
int
arch_padconf_set(u32_t padconf, u32_t mask, u32_t value)
{
/* check that the value will be inside the padconf memory range */
if (padconf >= (omap_padconf->size - omap_padconf->offset)) {
return EINVAL; /* outside of valid range */
}
set32(padconf + omap_padconf->base + omap_padconf->offset, mask, value);
return OK;
}
void
arch_padconf_init(void)
{
int x;
omap_padconf = NULL;
/* find the correct padconf */
for (x =0 ; x < sizeof(omap_padconfs)/sizeof(omap_padconfs[0]) ; x++) {
if ( (omap_padconfs[x].board_filter_mask & machine.board_id) == omap_padconfs[x].board_filter_value) {
omap_padconf = &omap_padconfs[x];
break;
}
}
assert(omap_padconf);
kern_phys_map_ptr(omap_padconf->base, omap_padconf->size,
&padconf_phys_map, (vir_bytes) &omap_padconf->base);
return;
}