1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * MTD primitives for XIP support. Architecture specific functions.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Do not include this file directly. It's included from linux/mtd/xip.h
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * Author: Vladimir Barinov <vbarinov@embeddedalley.com>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * (c) 2005 MontaVista Software, Inc. This file is licensed under the
9*4882a593Smuzhiyun * terms of the GNU General Public License version 2. This program is
10*4882a593Smuzhiyun * licensed "as is" without any warranty of any kind, whether express or
11*4882a593Smuzhiyun * implied.
12*4882a593Smuzhiyun */
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #ifndef __ARCH_OMAP_MTD_XIP_H__
15*4882a593Smuzhiyun #define __ARCH_OMAP_MTD_XIP_H__
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <mach/hardware.h>
18*4882a593Smuzhiyun #define OMAP_MPU_TIMER_BASE (0xfffec500)
19*4882a593Smuzhiyun #define OMAP_MPU_TIMER_OFFSET 0x100
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun typedef struct {
22*4882a593Smuzhiyun u32 cntl; /* CNTL_TIMER, R/W */
23*4882a593Smuzhiyun u32 load_tim; /* LOAD_TIM, W */
24*4882a593Smuzhiyun u32 read_tim; /* READ_TIM, R */
25*4882a593Smuzhiyun } xip_omap_mpu_timer_regs_t;
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun #define xip_omap_mpu_timer_base(n) \
28*4882a593Smuzhiyun ((volatile xip_omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE + \
29*4882a593Smuzhiyun (n)*OMAP_MPU_TIMER_OFFSET))
30*4882a593Smuzhiyun
xip_omap_mpu_timer_read(int nr)31*4882a593Smuzhiyun static inline unsigned long xip_omap_mpu_timer_read(int nr)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr);
34*4882a593Smuzhiyun return timer->read_tim;
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun #define xip_irqpending() \
38*4882a593Smuzhiyun (omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR))
39*4882a593Smuzhiyun #define xip_currtime() (~xip_omap_mpu_timer_read(0))
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun /*
42*4882a593Smuzhiyun * It's permitted to do approximation for xip_elapsed_since macro
43*4882a593Smuzhiyun * (see linux/mtd/xip.h)
44*4882a593Smuzhiyun */
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun #ifdef CONFIG_MACH_OMAP_PERSEUS2
47*4882a593Smuzhiyun #define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 7)
48*4882a593Smuzhiyun #else
49*4882a593Smuzhiyun #define xip_elapsed_since(x) (signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6)
50*4882a593Smuzhiyun #endif
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun /*
53*4882a593Smuzhiyun * xip_cpu_idle() is used when waiting for a delay equal or larger than
54*4882a593Smuzhiyun * the system timer tick period. This should put the CPU into idle mode
55*4882a593Smuzhiyun * to save power and to be woken up only when some interrupts are pending.
56*4882a593Smuzhiyun * As above, this should not rely upon standard kernel code.
57*4882a593Smuzhiyun */
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun #define xip_cpu_idle() asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1))
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun #endif /* __ARCH_OMAP_MTD_XIP_H__ */
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