linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * EMMA Mobile EV2 common clock framework support

 *

 * Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@renesas.com>

 * Copyright (C) 2012 Magnus Damm

 */

#include <linux/clk-provider.h>

#include <linux/clkdev.h>

#include <linux/io.h>

#include <linux/of.h>

#include <linux/of_address.h>

​

/* EMEV2 SMU registers */

#define USIAU0_RSTCTRL 0x094

#define USIBU1_RSTCTRL 0x0ac

#define USIBU2_RSTCTRL 0x0b0

#define USIBU3_RSTCTRL 0x0b4

#define IIC0_RSTCTRL 0x0dc

#define IIC1_RSTCTRL 0x0e0

#define STI_RSTCTRL 0x124

#define STI_CLKSEL 0x688

​

static DEFINE_SPINLOCK(lock);

​

/* not pretty, but hey */

static void __iomem *smu_base;

​

static void __init emev2_smu_write(unsigned long value, int offs)

{

    BUG_ON(!smu_base || (offs >= PAGE_SIZE));

    writel_relaxed(value, smu_base + offs);

}

​

static const struct of_device_id smu_id[] __initconst = {

    { .compatible = "renesas,emev2-smu", },

    {},

};

​

static void __init emev2_smu_init(void)

{

    struct device_node *np;

​

    np = of_find_matching_node(NULL, smu_id);

    BUG_ON(!np);

    smu_base = of_iomap(np, 0);

    BUG_ON(!smu_base);

    of_node_put(np);

​

    /* setup STI timer to run on 32.768 kHz and deassert reset */

    emev2_smu_write(0, STI_CLKSEL);

    emev2_smu_write(1, STI_RSTCTRL);

​

    /* deassert reset for UART0->UART3 */

    emev2_smu_write(2, USIAU0_RSTCTRL);

    emev2_smu_write(2, USIBU1_RSTCTRL);

    emev2_smu_write(2, USIBU2_RSTCTRL);

    emev2_smu_write(2, USIBU3_RSTCTRL);

​

    /* deassert reset for IIC0->IIC1 */

    emev2_smu_write(1, IIC0_RSTCTRL);

    emev2_smu_write(1, IIC1_RSTCTRL);

}