1/* 2 * MTD primitives for XIP support. Architecture specific functions. 3 * 4 * Do not include this file directly. It's included from linux/mtd/xip.h 5 * 6 * Author: Vladimir Barinov <vbarinov@embeddedalley.com> 7 * 8 * (c) 2005 MontaVista Software, Inc. This file is licensed under the 9 * terms of the GNU General Public License version 2. This program is 10 * licensed "as is" without any warranty of any kind, whether express or 11 * implied. 12 */ 13 14#ifndef __ARCH_OMAP_MTD_XIP_H__ 15#define __ARCH_OMAP_MTD_XIP_H__ 16 17#include <mach/hardware.h> 18#define OMAP_MPU_TIMER_BASE (0xfffec500) 19#define OMAP_MPU_TIMER_OFFSET 0x100 20 21typedef struct { 22 u32 cntl; /* CNTL_TIMER, R/W */ 23 u32 load_tim; /* LOAD_TIM, W */ 24 u32 read_tim; /* READ_TIM, R */ 25} xip_omap_mpu_timer_regs_t; 26 27#define xip_omap_mpu_timer_base(n) \ 28((volatile xip_omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \ 29 (n)*OMAP_MPU_TIMER_OFFSET)) 30 31static inline unsigned long xip_omap_mpu_timer_read(int nr) 32{ 33 volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr); 34 return timer->read_tim; 35} 36 37#define xip_irqpending() \ 38 (omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR)) 39#define xip_currtime() (~xip_omap_mpu_timer_read(0)) 40 41/* 42 * It's permitted to do approxmation for xip_elapsed_since macro 43 * (see linux/mtd/xip.h) 44 */ 45 46#ifdef CONFIG_MACH_OMAP_PERSEUS2 47#define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 7) 48#else 49#define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6) 50#endif 51 52/* 53 * xip_cpu_idle() is used when waiting for a delay equal or larger than 54 * the system timer tick period. This should put the CPU into idle mode 55 * to save power and to be woken up only when some interrupts are pending. 56 * As above, this should not rely upon standard kernel code. 57 */ 58 59#define xip_cpu_idle() asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1)) 60 61#endif /* __ARCH_OMAP_MTD_XIP_H__ */ 62