1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * MTD primitives for XIP support. Architecture specific functions.
4 *
5 * Do not include this file directly. It's included from linux/mtd/xip.h
6 *
7 * Author: Vladimir Barinov <vbarinov@embeddedalley.com>
8 *
9 * (c) 2005 MontaVista Software, Inc.
10 */
11
12#ifndef __ARCH_OMAP_MTD_XIP_H__
13#define __ARCH_OMAP_MTD_XIP_H__
14
15#include "hardware.h"
16#include <linux/soc/ti/omap1-io.h>
17#define OMAP_MPU_TIMER_BASE	(0xfffec500)
18#define OMAP_MPU_TIMER_OFFSET	0x100
19
20typedef struct {
21	u32 cntl;			/* CNTL_TIMER, R/W */
22	u32 load_tim;			/* LOAD_TIM,   W */
23	u32 read_tim;			/* READ_TIM,   R */
24} xip_omap_mpu_timer_regs_t;
25
26#define xip_omap_mpu_timer_base(n)					\
27((volatile xip_omap_mpu_timer_regs_t*)OMAP1_IO_ADDRESS(OMAP_MPU_TIMER_BASE +	\
28	(n)*OMAP_MPU_TIMER_OFFSET))
29
30static inline unsigned long xip_omap_mpu_timer_read(int nr)
31{
32	volatile xip_omap_mpu_timer_regs_t* timer = xip_omap_mpu_timer_base(nr);
33	return timer->read_tim;
34}
35
36#define xip_irqpending()	\
37	(omap_readl(OMAP_IH1_ITR) & ~omap_readl(OMAP_IH1_MIR))
38#define xip_currtime()		(~xip_omap_mpu_timer_read(0))
39
40/*
41 * It's permitted to do approximation for xip_elapsed_since macro
42 * (see linux/mtd/xip.h)
43 */
44
45#define xip_elapsed_since(x)	(signed)((~xip_omap_mpu_timer_read(0) - (x)) / 6)
46
47/*
48 * xip_cpu_idle() is used when waiting for a delay equal or larger than
49 * the system timer tick period.  This should put the CPU into idle mode
50 * to save power and to be woken up only when some interrupts are pending.
51 * As above, this should not rely upon standard kernel code.
52 */
53
54#define xip_cpu_idle()  asm volatile ("mcr p15, 0, %0, c7, c0, 4" :: "r" (1))
55
56#endif /* __ARCH_OMAP_MTD_XIP_H__ */
57