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/*
* MTD primitives for XIP support. Architecture specific functions.
*
* Do not include this file directly. It's included from linux/mtd/xip.h
*
* Author: Vladimir Barinov <vbarinov@embeddedalley.com>
*
* (c) 2005 MontaVista Software, Inc. This file is licensed under the
* terms of the GNU General Public License version 2. This program is
* licensed "as is" without any warranty of any kind, whether express or
* implied.
*/
#ifndef __ARCH_OMAP_MTD_XIP_H__
#define __ARCH_OMAP_MTD_XIP_H__
#include <mach/hardware.h>
#define OMAP_MPU_TIMER_BASE (0xfffec500)
#define OMAP_MPU_TIMER_OFFSET 0x100
typedef struct {
u32 cntl; /* CNTL_TIMER, R/W */
u32 load_tim; /* LOAD_TIM, W */
u32 read_tim; /* READ_TIM, R */
} xip_omap_mpu_timer_regs_t;
#define xip_omap_mpu_timer_base(n) \
((volatile xip_omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \
(n)*OMAP_MPU_TIMER_OFFSET))
static inline unsigned long xip_omap_mpu_timer_read(int nr)
{
volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr);
return timer->read_tim;
}
#define xip_irqpending() \
(omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR))
#define xip_currtime() (~xip_omap_mpu_timer_read(0))
/*
* It's permitted to do approxmation for xip_elapsed_since macro
* (see linux/mtd/xip.h)
*/
#ifdef CONFIG_MACH_OMAP_PERSEUS2
#define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 7)
#else
#define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6)
#endif
/*
* xip_cpu_idle() is used when waiting for a delay equal or larger than
* the system timer tick period. This should put the CPU into idle mode
* to save power and to be woken up only when some interrupts are pending.
* As above, this should not rely upon standard kernel code.
*/
#define xip_cpu_idle() asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1))
#endif /* __ARCH_OMAP_MTD_XIP_H__ */