81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
/* kernel headers */
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#include <minix/syslib.h>
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#include <minix/drvlib.h>
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#include <minix/log.h>
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#include <minix/mmio.h>
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#include <minix/clkconf.h>
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/* system headers */
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#include <sys/mman.h>
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#include <sys/types.h>
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/* usr headers */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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/* used for logging */
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static struct log log = {
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.name = "omap_clkconf",
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.log_level = LEVEL_INFO,
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.log_func = default_log
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};
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#ifdef DM37XX
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#define CM_BASE 0x48004000
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#elif AM335X
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#define CM_BASE 0x44E00000
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#endif
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static u32_t base = 0;
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static u32_t use_count = 0;
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int
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clkconf_init()
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{
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use_count++;
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if (base != 0) {
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/* when used in a library we can't guaranty we only call this
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* method once */
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log_trace(&log, "Called %d times\n", use_count);
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return OK;
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}
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struct minix_mem_range mr;
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mr.mr_base = CM_BASE;
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mr.mr_limit = CM_BASE + 0x1000;
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if (sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mr) != 0) {
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log_warn(&log, "Unable to request permission to map memory\n");
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return EPERM;
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}
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base = (uint32_t) vm_map_phys(SELF, (void *) CM_BASE, 0x1000);
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if (base == (uint32_t) MAP_FAILED) {
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log_warn(&log, "Unable to map GPIO memory\n");
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return EPERM;
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}
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return OK;
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}
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int
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clkconf_set(u32_t clk, u32_t mask, u32_t value)
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{
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set32(base + clk, mask, value);
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return OK;
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}
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int
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clkconf_release()
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{
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assert(use_count > 0);
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use_count--;
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if (use_count == 0) {
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vm_unmap_phys(SELF, (void *) base, 0x1000);
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}
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return OK;
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}
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