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/* kernel headers */
#include <minix/syslib.h>
#include <minix/drvlib.h>
#include <minix/log.h>
#include <minix/mmio.h>
#include <minix/clkconf.h>
#include <minix/type.h>
#include <minix/board.h>
/* system headers */
#include <sys/mman.h>
#include <sys/types.h>
/* usr headers */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
/* used for logging */
static struct log clk_log = {
.name = "omap_clkconf",
.log_level = LEVEL_INFO,
.log_func = default_log
};
#define DM37XX_CM_BASE 0x48004000
#define AM335X_CM_BASE 0x44E00000
static u32_t base = 0;
static u32_t use_count = 0;
int
clkconf_init()
{
use_count++;
struct machine machine;
sys_getmachine(&machine);
u32_t cm_base = 0;
if (base != 0) {
/* when used in a library we can't guaranty we only call this
* method once */
log_trace(&clk_log, "Called %d times\n", use_count);
return OK;
}
if (BOARD_IS_BBXM(machine.board_id)){
cm_base = DM37XX_CM_BASE;
} else if (BOARD_IS_BB(machine.board_id)){
cm_base = AM335X_CM_BASE;
}
struct minix_mem_range mr;
mr.mr_base = cm_base;
mr.mr_limit = cm_base + 0x1000;
if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != 0) {
log_warn(&clk_log,
"Unable to request permission to map memory\n");
return EPERM;
}
base = (uint32_t) vm_map_phys(SELF, (void *) cm_base, 0x1000);
if (base == (uint32_t) MAP_FAILED) {
log_warn(&clk_log, "Unable to map GPIO memory\n");
return EPERM;
}
return OK;
}
int
clkconf_set(u32_t clk, u32_t mask, u32_t value)
{
set32(base + clk, mask, value);
return OK;
}
int
clkconf_release()
{
assert(use_count > 0);
use_count--;
if (use_count == 0) {
vm_unmap_phys(SELF, (void *) base, 0x1000);
}
return OK;
}
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