setup-usb-phy.c

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/*
 * Copyright (C) 2012 Samsung Electronics Co.Ltd
 * Author: Joonyoung Shim <[email protected]>
 *
 * 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 Foundationr
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <mach/map.h>
#include <mach/regs-sys.h>
#include <plat/cpu.h>
#include <plat/regs-usb-hsotg-phy.h>
#include <plat/usb-phy.h>

static int s5pv210_usb_otgphy_init(struct platform_device *pdev)
{
    struct clk *xusbxti;
    u32 phyclk;

    writel(readl(S5PV210_USB_PHY_CON) | S5PV210_USB_PHY0_EN,
            S5PV210_USB_PHY_CON);

    /* set clock frequency for PLL */
    phyclk = readl(S3C_PHYCLK) & ~S3C_PHYCLK_CLKSEL_MASK;

    xusbxti = clk_get(&pdev->dev, "xusbxti");
    if (xusbxti && !IS_ERR(xusbxti)) {
        switch (clk_get_rate(xusbxti)) {
        case 12 * MHZ:
            phyclk |= S3C_PHYCLK_CLKSEL_12M;
            break;
        case 24 * MHZ:
            phyclk |= S3C_PHYCLK_CLKSEL_24M;
            break;
        default:
        case 48 * MHZ:
            /* default reference clock */
            break;
        }
        clk_put(xusbxti);
    }

    /* TODO: select external clock/oscillator */
    writel(phyclk | S3C_PHYCLK_CLK_FORCE, S3C_PHYCLK);

    /* set to normal OTG PHY */
    writel((readl(S3C_PHYPWR) & ~S3C_PHYPWR_NORMAL_MASK), S3C_PHYPWR);
    mdelay(1);

    /* reset OTG PHY and Link */
    writel(S3C_RSTCON_PHY | S3C_RSTCON_HCLK | S3C_RSTCON_PHYCLK,
            S3C_RSTCON);
    udelay(20); /* at-least 10uS */
    writel(0, S3C_RSTCON);

    return 0;
}

static int s5pv210_usb_otgphy_exit(struct platform_device *pdev)
{
    writel((readl(S3C_PHYPWR) | S3C_PHYPWR_ANALOG_POWERDOWN |
                S3C_PHYPWR_OTG_DISABLE), S3C_PHYPWR);

    writel(readl(S5PV210_USB_PHY_CON) & ~S5PV210_USB_PHY0_EN,
            S5PV210_USB_PHY_CON);

    return 0;
}

int s5p_usb_phy_init(struct platform_device *pdev, int type)
{
    if (type == S5P_USB_PHY_DEVICE)
        return s5pv210_usb_otgphy_init(pdev);

    return -EINVAL;
}

int s5p_usb_phy_exit(struct platform_device *pdev, int type)
{
    if (type == S5P_USB_PHY_DEVICE)
        return s5pv210_usb_otgphy_exit(pdev);

    return -EINVAL;
}