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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/m68k/coldfire/m54xx.c
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// SPDX-License-Identifier: GPL-2.0

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

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/*

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 *	m54xx.c  -- platform support for ColdFire 54xx based boards

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 *

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 *	Copyright (C) 2010, Philippe De Muyter <[email protected]>

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 */

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

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#include <linux/clkdev.h>

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#include <linux/kernel.h>

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#include <linux/param.h>

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#include <linux/init.h>

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#include <linux/interrupt.h>

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#include <linux/io.h>

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#include <linux/mm.h>

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#include <linux/clk.h>

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#include <linux/memblock.h>

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#include <asm/pgalloc.h>

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#include <asm/machdep.h>

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#include <asm/coldfire.h>

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#include <asm/m54xxsim.h>

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#include <asm/mcfuart.h>

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#include <asm/mcfclk.h>

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#include <asm/m54xxgpt.h>

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#ifdef CONFIG_MMU

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#include <asm/mmu_context.h>

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#endif

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

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

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

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static struct clk_lookup m54xx_clk_lookup[] = {

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	CLKDEV_INIT(NULL, "pll.0", &clk_pll),

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	CLKDEV_INIT(NULL, "sys.0", &clk_sys),

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	CLKDEV_INIT("mcfslt.0", NULL, &clk_sys),

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	CLKDEV_INIT("mcfslt.1", NULL, &clk_sys),

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	CLKDEV_INIT("mcfuart.0", NULL, &clk_sys),

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	CLKDEV_INIT("mcfuart.1", NULL, &clk_sys),

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	CLKDEV_INIT("mcfuart.2", NULL, &clk_sys),

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	CLKDEV_INIT("mcfuart.3", NULL, &clk_sys),

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	CLKDEV_INIT("imx1-i2c.0", NULL, &clk_sys),

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};

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

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static void __init m54xx_uarts_init(void)

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{

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	/* enable io pins */

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	__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC0);

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	__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS,

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		MCFGPIO_PAR_PSC1);

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	__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS |

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		MCF_PAR_PSC_CTS_CTS, MCFGPIO_PAR_PSC2);

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	__raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC3);

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}

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

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static void __init m54xx_i2c_init(void)

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{

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#if IS_ENABLED(CONFIG_I2C_IMX)

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	u32 r;

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	/* set the fec/i2c/irq pin assignment register for i2c */

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	r = readl(MCF_PAR_FECI2CIRQ);

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	r |= MCF_PAR_FECI2CIRQ_SDA | MCF_PAR_FECI2CIRQ_SCL;

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	writel(r, MCF_PAR_FECI2CIRQ);

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#endif /* IS_ENABLED(CONFIG_I2C_IMX) */

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}

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

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static void mcf54xx_reset(void)

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{

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	/* disable interrupts and enable the watchdog */

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	asm("movew #0x2700, %sr\n");

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	__raw_writel(0, MCF_GPT_GMS0);

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	__raw_writel(MCF_GPT_GCIR_CNT(1), MCF_GPT_GCIR0);

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	__raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),

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		MCF_GPT_GMS0);

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}

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

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void __init config_BSP(char *commandp, int size)

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{

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	mach_reset = mcf54xx_reset;

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	mach_sched_init = hw_timer_init;

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	m54xx_uarts_init();

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	m54xx_i2c_init();

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	clkdev_add_table(m54xx_clk_lookup, ARRAY_SIZE(m54xx_clk_lookup));

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}

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

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