1 /*
2 * AM33XX CM module functions
3 *
4 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * Based on arch/arm/mach-omap2/cm4xxx.c
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12 #include <linux/delay.h>
13 #include <linux/errno.h>
14 #include <linux/err.h>
15 #include <linux/io.h>
17 #include "common.h"
19 #include "cm.h"
20 #include "cm-regbits-33xx.h"
21 #include "cm33xx.h"
23 /**
24 * am33xx_cm_wait_module_ready - wait for a module to be in 'func' state
25 * @inst: Offset of CM instance associated with
26 * @clkctrl_reg: CLKCTRL offset from CM instance base
27 *
28 * Wait for the module IDLEST to be functional. If the idle state is in any
29 * the non functional state (trans, idle or disabled), module and thus the
30 * sysconfig cannot be accessed and will probably lead to an "imprecise
31 * external abort"
32 *
33 * Module idle state:
34 * 0x0 func: Module is fully functional, including OCP
35 * 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
36 * abortion
37 * 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
38 * using separate functional clock
39 * 0x3 disabled: Module is disabled and cannot be accessed
40 *
41 */
42 int am33xx_cm_wait_module_ready(u16 inst, u16 clkctrl_reg)
43 {
44 int i = 0;
46 omap_test_timeout((
47 ((__raw_readl(AM33XX_CM_REGADDR(inst, clkctrl_reg)) &
48 AM33XX_IDLEST_MASK) == 0)), MAX_MODULE_READY_TIME, i);
50 return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
51 }