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mtd-xip.h
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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 <[email protected]>
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 */
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 {
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__ */