cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mtd-xip.h (1959B)

      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
     22typedef 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
     32static 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__ */