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 "hardware.h" 18 #include <linux/soc/ti/omap1-io.h> 19 #define OMAP_MPU_TIMER_BASE (0xfffec500) 20 #define OMAP_MPU_TIMER_OFFSET 0x100 21 22 typedef struct { 23 u32 cntl; /* CNTL_TIMER, R/W */ 24 u32 load_tim; /* LOAD_TIM, W */ 25 u32 read_tim; /* READ_TIM, R */ 26 } xip_omap_mpu_timer_regs_t; 27 28 #define xip_omap_mpu_timer_base(n) \ 29 ((volatile xip_omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \ 30 (n)*OMAP_MPU_TIMER_OFFSET)) 31 32 static inline unsigned long xip_omap_mpu_timer_read(int nr) 33 { 34 volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr); 35 return timer->read_tim; 36 } 37 38 #define xip_irqpending() \ 39 (omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR)) 40 #define xip_currtime() (~xip_omap_mpu_timer_read(0)) 41 42 /* 43 * It's permitted to do approximation for xip_elapsed_since macro 44 * (see linux/mtd/xip.h) 45 */ 46 47 #ifdef CONFIG_MACH_OMAP_PERSEUS2 48 #define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 7) 49 #else 50 #define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6) 51 #endif 52 53 /* 54 * xip_cpu_idle() is used when waiting for a delay equal or larger than 55 * the system timer tick period. This should put the CPU into idle mode 56 * to save power and to be woken up only when some interrupts are pending. 57 * As above, this should not rely upon standard kernel code. 58 */ 59 60 #define xip_cpu_idle() asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1)) 61 62 #endif /* __ARCH_OMAP_MTD_XIP_H__ */ 63