92 lines
1.7 KiB
C
92 lines
1.7 KiB
C
/* 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;
|
|
}
|