linux_kernel/arch/m68k/coldfire/m525x.c

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

/*
 *	525x.c  -- platform support for ColdFire 525x based boards
 *
 *	Copyright (C) 2012, Steven King <sfking@fdwdc.com>
 */

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

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

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

DEFINE_CLK(pll, "pll.0", MCF_CLK);
DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);
DEFINE_CLK(mcftmr0, "mcftmr.0", MCF_BUSCLK);
DEFINE_CLK(mcftmr1, "mcftmr.1", MCF_BUSCLK);
DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK);
DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK);
DEFINE_CLK(mcfqspi0, "mcfqspi.0", MCF_BUSCLK);
DEFINE_CLK(mcfi2c0, "imx1-i2c.0", MCF_BUSCLK);
DEFINE_CLK(mcfi2c1, "imx1-i2c.1", MCF_BUSCLK);

struct clk *mcf_clks[] = {
	&clk_pll,
	&clk_sys,
	&clk_mcftmr0,
	&clk_mcftmr1,
	&clk_mcfuart0,
	&clk_mcfuart1,
	&clk_mcfqspi0,
	&clk_mcfi2c0,
	&clk_mcfi2c1,
	NULL
};

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

static void __init m525x_qspi_init(void)
{
#if IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI)
	/* set the GPIO function for the qspi cs gpios */
	/* FIXME: replace with pinmux/pinctl support */
	u32 f = readl(MCFSIM2_GPIOFUNC);
	f |= (1 << MCFQSPI_CS2) | (1 << MCFQSPI_CS1) | (1 << MCFQSPI_CS0);
	writel(f, MCFSIM2_GPIOFUNC);

	/* QSPI irq setup */
	writeb(MCFSIM_ICR_AUTOVEC | MCFSIM_ICR_LEVEL4 | MCFSIM_ICR_PRI0,
	       MCFSIM_QSPIICR);
	mcf_mapirq2imr(MCF_IRQ_QSPI, MCFINTC_QSPI);
#endif /* IS_ENABLED(CONFIG_SPI_COLDFIRE_QSPI) */
}

static void __init m525x_i2c_init(void)
{
#if IS_ENABLED(CONFIG_I2C_IMX)
	u32 r;

	/* first I2C controller uses regular irq setup */
	writeb(MCFSIM_ICR_AUTOVEC | MCFSIM_ICR_LEVEL5 | MCFSIM_ICR_PRI0,
	       MCFSIM_I2CICR);
	mcf_mapirq2imr(MCF_IRQ_I2C0, MCFINTC_I2C);

	/* second I2C controller is completely different */
	r = readl(MCFINTC2_INTPRI_REG(MCF_IRQ_I2C1));
	r &= ~MCFINTC2_INTPRI_BITS(0xf, MCF_IRQ_I2C1);
	r |= MCFINTC2_INTPRI_BITS(0x5, MCF_IRQ_I2C1);
	writel(r, MCFINTC2_INTPRI_REG(MCF_IRQ_I2C1));
#endif /* IS_ENABLED(CONFIG_I2C_IMX) */
}

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

void __init config_BSP(char *commandp, int size)
{
	mach_sched_init = hw_timer_init;

	m525x_qspi_init();
	m525x_i2c_init();
}

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