/* * OMAP2/3 CM module functions * * Copyright (C) 2009 Nokia Corporation * Paul Walmsley * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/spinlock.h> #include <linux/list.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/io.h> #include <asm/atomic.h> #include <plat/common.h> #include "cm.h" #include "cm-regbits-24xx.h" #include "cm-regbits-34xx.h" /* MAX_MODULE_READY_TIME: max milliseconds for module to leave idle */ #define MAX_MODULE_READY_TIME 20000 static const u8 cm_idlest_offs[] = { CM_IDLEST1, CM_IDLEST2, OMAP2430_CM_IDLEST3 }; /** * omap2_cm_wait_idlest_ready - wait for a module to leave idle or standby * @prcm_mod: PRCM module offset * @idlest_id: CM_IDLESTx register ID (i.e., x = 1, 2, 3) * @idlest_shift: shift of the bit in the CM_IDLEST* register to check * * XXX document */ int omap2_cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift) { int ena = 0, i = 0; u8 cm_idlest_reg; u32 mask; if (!idlest_id || (idlest_id > ARRAY_SIZE(cm_idlest_offs))) return -EINVAL; cm_idlest_reg = cm_idlest_offs[idlest_id - 1]; if (cpu_is_omap24xx()) ena = idlest_shift; else if (cpu_is_omap34xx()) ena = 0; else BUG(); mask = 1 << idlest_shift; /* XXX should be OMAP2 CM */ omap_test_timeout(((cm_read_mod_reg(prcm_mod, cm_idlest_reg) & mask) == ena), MAX_MODULE_READY_TIME, i); return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY; }