| /* |
| * 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" |
| |
| 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]; |
| |
| mask = 1 << idlest_shift; |
| |
| if (cpu_is_omap24xx()) |
| ena = mask; |
| else if (cpu_is_omap34xx()) |
| ena = 0; |
| else |
| BUG(); |
| |
| /* 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; |
| } |
| |