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| 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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