io.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * linux/arch/arm/mach-omap1/io.c
  4 *
  5 * OMAP1 I/O mapping code
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/init.h>
 11#include <linux/io.h>
 12#include <linux/omap-dma.h>
 13
 14#include <asm/tlb.h>
 15#include <asm/mach/map.h>
 16
 17#include "tc.h"
 18#include "iomap.h"
 19#include "common.h"
 20
 21/*
 22 * The machine specific code may provide the extra mapping besides the
 23 * default mapping provided here.
 24 */
 25static struct map_desc omap1_io_desc[] __initdata = {
 26	{
 27		.virtual	= OMAP1_IO_VIRT,
 28		.pfn		= __phys_to_pfn(OMAP1_IO_PHYS),
 29		.length		= OMAP1_IO_SIZE,
 30		.type		= MT_DEVICE
 31	}, {
 32		.virtual	= OMAP1_DSP_BASE,
 33		.pfn		= __phys_to_pfn(OMAP1_DSP_START),
 34		.length		= OMAP1_DSP_SIZE,
 35		.type		= MT_DEVICE
 36	}, {
 37		.virtual	= OMAP1_DSPREG_BASE,
 38		.pfn		= __phys_to_pfn(OMAP1_DSPREG_START),
 39		.length		= OMAP1_DSPREG_SIZE,
 40		.type		= MT_DEVICE
 41	}
 42};
 43
 44/*
 45 * Maps common IO regions for omap1
 46 */
 47void __init omap1_map_io(void)
 48{
 49	iotable_init(omap1_io_desc, ARRAY_SIZE(omap1_io_desc));
 50}
 51
 52/*
 53 * Common low-level hardware init for omap1.
 54 */
 55void __init omap1_init_early(void)
 56{
 57	omap_check_revision();
 58
 59	/* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
 60	 * on a Posted Write in the TIPB Bridge".
 61	 */
 62	omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
 63	omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
 64}
 65
 66void __init omap1_init_late(void)
 67{
 68	omap_serial_wakeup_init();
 69}
 70
 71/*
 72 * NOTE: Please use ioremap + __raw_read/write where possible instead of these
 73 */
 74
 75u8 omap_readb(u32 pa)
 76{
 77	return __raw_readb(OMAP1_IO_ADDRESS(pa));
 78}
 79EXPORT_SYMBOL(omap_readb);
 80
 81u16 omap_readw(u32 pa)
 82{
 83	return __raw_readw(OMAP1_IO_ADDRESS(pa));
 84}
 85EXPORT_SYMBOL(omap_readw);
 86
 87u32 omap_readl(u32 pa)
 88{
 89	return __raw_readl(OMAP1_IO_ADDRESS(pa));
 90}
 91EXPORT_SYMBOL(omap_readl);
 92
 93void omap_writeb(u8 v, u32 pa)
 94{
 95	__raw_writeb(v, OMAP1_IO_ADDRESS(pa));
 96}
 97EXPORT_SYMBOL(omap_writeb);
 98
 99void omap_writew(u16 v, u32 pa)
100{
101	__raw_writew(v, OMAP1_IO_ADDRESS(pa));
102}
103EXPORT_SYMBOL(omap_writew);
104
105void omap_writel(u32 v, u32 pa)
106{
107	__raw_writel(v, OMAP1_IO_ADDRESS(pa));
108}
109EXPORT_SYMBOL(omap_writel);