arch/arm/mach-omap1/mtd-xip.h

   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 #define xip_elapsed_since(x)    (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6)
  46
  47 /*
  48  * xip_cpu_idle() is used when waiting for a delay equal or larger than
  49  * the system timer tick period.  This should put the CPU into idle mode
  50  * to save power and to be woken up only when some interrupts are pending.
  51  * As above, this should not rely upon standard kernel code.
  52  */
  53
  54 #define xip_cpu_idle()  asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1))
  55
  56 #endif /* __ARCH_OMAP_MTD_XIP_H__ */