arch/m68k/coldfire/m528x.c

Source file repositories/reference/linux-study-clean/arch/m68k/coldfire/m528x.c

File Facts

System
Linux kernel
Corpus path
arch/m68k/coldfire/m528x.c
Extension
.c
Size
3945 bytes
Lines
144
Domain
Architecture Layer
Bucket
arch/m68k
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/***************************************************************************/

/*
 *	m528x.c  -- platform support for ColdFire 528x based boards
 *
 *	Sub-architcture dependent initialization code for the Freescale
 *	5280, 5281 and 5282 CPUs.
 *
 *	Copyright (C) 1999-2003, Greg Ungerer (gerg@snapgear.com)
 *	Copyright (C) 2001-2003, SnapGear Inc. (www.snapgear.com)
 */

/***************************************************************************/

#include <linux/clkdev.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <asm/machdep.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
#include <asm/mcfclk.h>

/***************************************************************************/

DEFINE_CLK(pll, "pll.0", MCF_CLK);
DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);

static struct clk_lookup m528x_clk_lookup[] = {
	CLKDEV_INIT(NULL, "pll.0", &clk_pll),
	CLKDEV_INIT(NULL, "sys.0", &clk_sys),
	CLKDEV_INIT("mcfpit.0", NULL, &clk_pll),
	CLKDEV_INIT("mcfpit.1", NULL, &clk_pll),
	CLKDEV_INIT("mcfpit.2", NULL, &clk_pll),
	CLKDEV_INIT("mcfpit.3", NULL, &clk_pll),
	CLKDEV_INIT("mcfuart.0", NULL, &clk_sys),
	CLKDEV_INIT("mcfuart.1", NULL, &clk_sys),
	CLKDEV_INIT("mcfuart.2", NULL, &clk_sys),
	CLKDEV_INIT("mcfqspi.0", NULL, &clk_sys),
	CLKDEV_INIT("fec.0", NULL, &clk_sys),
	CLKDEV_INIT("imx1-i2c.0", NULL, &clk_sys),
};

/***************************************************************************/

static void __init m528x_qspi_init(void)
{
#if IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI)
	/* setup Port QS for QSPI with gpio CS control */
	mcf_write8(0x07, MCFGPIO_PQSPAR);
#endif /* IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI) */
}

/***************************************************************************/

static void __init m528x_i2c_init(void)
{
#if IS_ENABLED(CONFIG_I2C_IMX)
	u16 paspar;

	/* setup Port AS Pin Assignment Register for I2C */
	/*  set PASPA0 to SCL and PASPA1 to SDA */
	paspar = mcf_read16(MCFGPIO_PASPAR);
	paspar |= 0xF;
	mcf_write16(paspar, MCFGPIO_PASPAR);
#endif /* IS_ENABLED(CONFIG_I2C_IMX) */
}

/***************************************************************************/

static void __init m528x_uarts_init(void)
{
	u8 port;

	/* make sure PUAPAR is set for UART0 and UART1 */
	port = mcf_read8(MCFGPIO_PUAPAR);
	port |= 0x03 | (0x03 << 2);
	mcf_write8(port, MCFGPIO_PUAPAR);
}

/***************************************************************************/

static void __init m528x_fec_init(void)
{
	u16 v16;

Annotation

Implementation Notes