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
xip_omap_mpu_timer_read(int nr)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 approximation 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
