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