arch/arm/plat-omap/include/mach/mtd-xip.h

   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
  21 typedef 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
  31 static 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__ */