linux/arch/arm/mach-omap1/io.c

/*
 * linux/arch/arm/mach-omap1/io.c
 *
 * OMAP1 I/O mapping code
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/mach/map.h>
#include <asm/io.h>
#include <asm/arch/tc.h>

extern int clk_init(void);
extern void omap_check_revision(void);

/*
 * The machine specific code may provide the extra mapping besides the
 * default mapping provided here.
 */
static struct map_desc omap_io_desc[] __initdata = {
 { IO_VIRT,      	IO_PHYS,             IO_SIZE,        	   MT_DEVICE },
};

#ifdef CONFIG_ARCH_OMAP730
static struct map_desc omap730_io_desc[] __initdata = {
 { OMAP730_DSP_BASE,    OMAP730_DSP_START,    OMAP730_DSP_SIZE,    MT_DEVICE },
 { OMAP730_DSPREG_BASE, OMAP730_DSPREG_START, OMAP730_DSPREG_SIZE, MT_DEVICE },
 { OMAP730_SRAM_BASE,   OMAP730_SRAM_START,   OMAP730_SRAM_SIZE,   MT_DEVICE }
};
#endif

#ifdef CONFIG_ARCH_OMAP1510
static struct map_desc omap1510_io_desc[] __initdata = {
 { OMAP1510_DSP_BASE,    OMAP1510_DSP_START,    OMAP1510_DSP_SIZE,    MT_DEVICE },
 { OMAP1510_DSPREG_BASE, OMAP1510_DSPREG_START, OMAP1510_DSPREG_SIZE, MT_DEVICE },
 { OMAP1510_SRAM_BASE,   OMAP1510_SRAM_START,   OMAP1510_SRAM_SIZE,   MT_DEVICE }
};
#endif

#if defined(CONFIG_ARCH_OMAP16XX)
static struct map_desc omap1610_io_desc[] __initdata = {
 { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
 { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
 { OMAP16XX_SRAM_BASE,   OMAP16XX_SRAM_START,   OMAP1610_SRAM_SIZE,   MT_DEVICE }
};

static struct map_desc omap5912_io_desc[] __initdata = {
 { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
 { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
/*
 * The OMAP5912 has 250kByte internal SRAM. Because the mapping is baseed on page
 * size (4kByte), it seems that the last 2kByte (=0x800) of the 250kByte are not mapped.
 * Add additional 2kByte (0x800) so that the last page is mapped and the last 2kByte
 * can be used.
 */
 { OMAP16XX_SRAM_BASE,   OMAP16XX_SRAM_START,   OMAP5912_SRAM_SIZE + 0x800,   MT_DEVICE }
};
#endif

static int initialized = 0;

static void __init _omap_map_io(void)
{
	initialized = 1;

	/* We have to initialize the IO space mapping before we can run
	 * cpu_is_omapxxx() macros. */
	iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
	omap_check_revision();

#ifdef CONFIG_ARCH_OMAP730
	if (cpu_is_omap730()) {
		iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
	}
#endif
#ifdef CONFIG_ARCH_OMAP1510
	if (cpu_is_omap1510()) {
		iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
	}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
	if (cpu_is_omap1610() || cpu_is_omap1710()) {
		iotable_init(omap1610_io_desc, ARRAY_SIZE(omap1610_io_desc));
	}
	if (cpu_is_omap5912()) {
		iotable_init(omap5912_io_desc, ARRAY_SIZE(omap5912_io_desc));
	}
#endif

	/* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
	 * on a Posted Write in the TIPB Bridge".
	 */
	omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
	omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);

	/* Must init clocks early to assure that timer interrupt works
	 */
	clk_init();
}

/*
 * This should only get called from board specific init
 */
void omap_map_common_io(void)
{
	if (!initialized)
		_omap_map_io();
}