117 lines
2.5 KiB
C
117 lines
2.5 KiB
C
/*
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* Copyright (c) 2013 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include <common.h>
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#include <init.h>
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#include <io.h>
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#include <of.h>
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#include <errno.h>
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#include <driver.h>
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#include <malloc.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#define SET 0x4
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#define CLR 0x8
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#define USBPHY_CTRL 0x30
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#define USBPHY_CTRL_SFTRST (1 << 31)
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#define USBPHY_CTRL_CLKGATE (1 << 30)
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#define USBPHY_CTRL_ENUTMILEVEL3 (1 << 15)
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#define USBPHY_CTRL_ENUTMILEVEL2 (1 << 14)
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struct imx_usbphy {
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void __iomem *base;
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struct clk *clk;
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};
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static int imx_usbphy_enable(struct imx_usbphy *imxphy)
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{
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u32 val;
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clk_enable(imxphy->clk);
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/* reset usbphy */
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writel(USBPHY_CTRL_SFTRST, imxphy->base + USBPHY_CTRL + SET);
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udelay(10);
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/* clr reset and clkgate */
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writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
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imxphy->base + USBPHY_CTRL + CLR);
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/* clr all pwd bits => power up phy */
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writel(0xffffffff, imxphy->base + CLR);
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/* set utmilvl2/3 */
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val = readl(imxphy->base + USBPHY_CTRL);
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val |= USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2;
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writel(val, imxphy->base + USBPHY_CTRL + SET);
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return 0;
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}
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static int imx_usbphy_probe(struct device_d *dev)
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{
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int ret;
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struct imx_usbphy *imxphy;
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imxphy = xzalloc(sizeof(*imxphy));
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imxphy->base = dev_request_mem_region(dev, 0);
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if (!imxphy->base) {
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ret = -ENODEV;
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goto err_free;
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}
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imxphy->clk = clk_get(dev, NULL);
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if (IS_ERR(imxphy->clk)) {
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dev_err(dev, "could not get clk: %s\n", strerror(-PTR_ERR(imxphy->clk)));
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goto err_clk;
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}
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imx_usbphy_enable(imxphy);
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dev_dbg(dev, "phy enabled\n");
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return 0;
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err_clk:
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err_free:
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free(imxphy);
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return ret;
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};
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static __maybe_unused struct of_device_id imx_usbphy_dt_ids[] = {
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{
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.compatible = "fsl,imx23-usbphy",
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}, {
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/* sentinel */
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},
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};
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static struct driver_d imx_usbphy_driver = {
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.name = "imx-usb-phy",
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.probe = imx_usbphy_probe,
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.of_compatible = DRV_OF_COMPAT(imx_usbphy_dt_ids),
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};
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static int imx_usbphy_init(void)
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{
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return platform_driver_register(&imx_usbphy_driver);
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}
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fs_initcall(imx_usbphy_init);
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