linux-imx

/*

 * Allwinner sun9i USB phy driver

 *

 * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>

 *

 * Based on phy-sun4i-usb.c from

 * Hans de Goede <hdegoede@redhat.com>

 *

 * and code from

 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

​

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/phy/phy.h>

#include <linux/usb/of.h>

#include <linux/platform_device.h>

#include <linux/reset.h>

​

#define SUNXI_AHB_INCR16_BURST_EN   BIT(11)

#define SUNXI_AHB_INCR8_BURST_EN    BIT(10)

#define SUNXI_AHB_INCR4_BURST_EN    BIT(9)

#define SUNXI_AHB_INCRX_ALIGN_EN    BIT(8)

#define SUNXI_ULPI_BYPASS_EN        BIT(0)

​

/* usb1 HSIC specific bits */

#define SUNXI_EHCI_HS_FORCE     BIT(20)

#define SUNXI_HSIC_CONNECT_DET      BIT(17)

#define SUNXI_HSIC_CONNECT_INT      BIT(16)

#define SUNXI_HSIC          BIT(1)

​

struct sun9i_usb_phy {

    struct phy *phy;

    void __iomem *pmu;

    struct reset_control *reset;

    struct clk *clk;

    struct clk *hsic_clk;

    enum usb_phy_interface type;

};

​

static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)

{

    u32 bits, reg_value;

​

    bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |

        SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |

        SUNXI_ULPI_BYPASS_EN;

​

    if (phy->type == USBPHY_INTERFACE_MODE_HSIC)

        bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |

            SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;

​

    reg_value = readl(phy->pmu);

​

    if (enable)

        reg_value |= bits;

    else

        reg_value &= ~bits;

​

    writel(reg_value, phy->pmu);

}

​

static int sun9i_usb_phy_init(struct phy *_phy)

{

    struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);

    int ret;

​

    ret = clk_prepare_enable(phy->clk);

    if (ret)

        goto err_clk;

​

    ret = clk_prepare_enable(phy->hsic_clk);

    if (ret)

        goto err_hsic_clk;

​

    ret = reset_control_deassert(phy->reset);

    if (ret)

        goto err_reset;

​

    sun9i_usb_phy_passby(phy, 1);