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@ru.mvista.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 <asm/hardware.h>
18#define OMAP_MPU_TIMER_BASE	(0xfffec500)
19#define OMAP_MPU_TIMER_OFFSET	0x100
20
21typedef 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*)IO_ADDRESS(OMAP_MPU_TIMER_BASE +	\
29	(n)*OMAP_MPU_TIMER_OFFSET))
30
31static 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__ */
62