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
20 typedef 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
30 static 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
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