1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * MTD primitives for XIP support. Architecture specific functions. 4 * 5 * Do not include this file directly. It's included from linux/mtd/xip.h 6 * 7 * Author: Vladimir Barinov <vbarinov@embeddedalley.com> 8 * 9 * (c) 2005 MontaVista Software, Inc. 10 */ 11 12 #ifndef __ARCH_OMAP_MTD_XIP_H__ 13 #define __ARCH_OMAP_MTD_XIP_H__ 14 15 #include "hardware.h" 16 #include <linux/soc/ti/omap1-io.h> 17 #define OMAP_MPU_TIMER_BASE (0xfffec500) 18 #define OMAP_MPU_TIMER_OFFSET 0x100 19 20 typedef struct { 21 u32 cntl; /* CNTL_TIMER, R/W */ 22 u32 load_tim; /* LOAD_TIM, W */ 23 u32 read_tim; /* READ_TIM, R */ 24 } xip_omap_mpu_timer_regs_t; 25 26 #define xip_omap_mpu_timer_base(n) \ 27 ((volatile xip_omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \ 28 (n)*OMAP_MPU_TIMER_OFFSET)) 29 30 static inline unsigned long xip_omap_mpu_timer_read(int nr) 31 { 32 volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr); 33 return timer->read_tim; 34 } 35 36 #define xip_irqpending() \ 37 (omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR)) 38 #define xip_currtime() (~xip_omap_mpu_timer_read(0)) 39 40 /* 41 * It's permitted to do approximation for xip_elapsed_since macro 42 * (see linux/mtd/xip.h) 43 */ 44 45 #ifdef CONFIG_MACH_OMAP_PERSEUS2 46 #define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 7) 47 #else 48 #define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6) 49 #endif 50 51 /* 52 * xip_cpu_idle() is used when waiting for a delay equal or larger than 53 * the system timer tick period. This should put the CPU into idle mode 54 * to save power and to be woken up only when some interrupts are pending. 55 * As above, this should not rely upon standard kernel code. 56 */ 57 58 #define xip_cpu_idle() asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1)) 59 60 #endif /* __ARCH_OMAP_MTD_XIP_H__ */ 61