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      1 /*	$NetBSD: imx6_usbphy.c,v 1.3 2023/05/04 13:29:33 bouyer Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2019 Genetec Corporation.  All rights reserved.
      5  * Written by Hashimoto Kenichi for Genetec Corporation.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(1, "$NetBSD: imx6_usbphy.c,v 1.3 2023/05/04 13:29:33 bouyer Exp $");
     31 
     32 #include "opt_fdt.h"
     33 
     34 #include "locators.h"
     35 #include "ohci.h"
     36 #include "ehci.h"
     37 
     38 #include <sys/param.h>
     39 #include <sys/bus.h>
     40 #include <sys/device.h>
     41 
     42 #include <arm/nxp/imx6_usbphyreg.h>
     43 
     44 #include <dev/fdt/fdtvar.h>
     45 
     46 struct imx6_usbphy_softc {
     47 	device_t sc_dev;
     48 
     49 	bus_space_tag_t sc_iot;
     50 	bus_space_handle_t sc_ioh;
     51 
     52 	struct clk *sc_clk;
     53 };
     54 
     55 static int imx6_usbphy_match(device_t, cfdata_t, void *);
     56 static void imx6_usbphy_attach(device_t, device_t, void *);
     57 
     58 static int imx6_usbphy_init_clocks(device_t);
     59 static int imx6_usbphy_enable(device_t, void *, bool);
     60 
     61 CFATTACH_DECL_NEW(imxusbphy, sizeof(struct imx6_usbphy_softc),
     62     imx6_usbphy_match, imx6_usbphy_attach, NULL, NULL);
     63 
     64 static const struct device_compatible_entry compat_data[] = {
     65 	{ .compat = "fsl,imx6q-usbphy" },
     66 	{ .compat = "fsl,imx6sx-usbphy" },
     67 	DEVICE_COMPAT_EOL
     68 };
     69 
     70 static int
     71 imx6_usbphy_match(device_t parent, cfdata_t cf, void *aux)
     72 {
     73 	struct fdt_attach_args * const faa = aux;
     74 
     75 	return of_compatible_match(faa->faa_phandle, compat_data);
     76 }
     77 
     78 static void
     79 imx6_usbphy_attach(device_t parent, device_t self, void *aux)
     80 {
     81 	struct imx6_usbphy_softc *sc = device_private(self);
     82 	struct fdt_attach_args * const faa = aux;
     83 	const int phandle = faa->faa_phandle;
     84 	bus_space_tag_t bst = faa->faa_bst;
     85 	bus_space_handle_t bsh;
     86 	bus_addr_t addr;
     87 	bus_size_t size;
     88 	int error;
     89 
     90 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     91 		aprint_error(": couldn't get iomux registers\n");
     92 		return;
     93 	}
     94 
     95 	error = bus_space_map(bst, addr, size, 0, &bsh);
     96 	if (error) {
     97 		aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
     98 		return;
     99 	}
    100 
    101 	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
    102 	if (sc->sc_clk == NULL) {
    103 		aprint_error(": couldn't get clock\n");
    104 		return;
    105 	}
    106 
    107 	sc->sc_dev = self;
    108 	sc->sc_iot = bst;
    109 	sc->sc_ioh = bsh;
    110 
    111 	aprint_naive("\n");
    112 	aprint_normal(": USB PHY\n");
    113 
    114 	imx6_usbphy_init_clocks(self);
    115 	imx6_usbphy_enable(self, NULL, true);
    116 }
    117 
    118 static int
    119 imx6_usbphy_init_clocks(device_t dev)
    120 {
    121 	struct imx6_usbphy_softc * const sc = device_private(dev);
    122 	int error;
    123 
    124 	error = clk_enable(sc->sc_clk);
    125 	if (error) {
    126 		aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
    127 		return error;
    128 	}
    129 
    130 	return 0;
    131 }
    132 
    133 #define	USBPHY_READ(sc, reg)						      \
    134 	bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))
    135 #define	USBPHY_WRITE(sc, reg, val)					      \
    136 	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
    137 
    138 static int
    139 imx6_usbphy_enable(device_t dev, void *priv, bool enable)
    140 {
    141 	struct imx6_usbphy_softc * const sc = device_private(dev);
    142 
    143 	/* USBPHY enable */
    144 	USBPHY_WRITE(sc, USBPHY_CTRL, USBPHY_CTRL_CLKGATE);
    145 
    146 	/* do reset */
    147 	USBPHY_WRITE(sc, USBPHY_CTRL_SET, USBPHY_CTRL_SFTRST);
    148 	delay(100);
    149 
    150 	/* clear reset, and run clocks */
    151 	USBPHY_WRITE(sc, USBPHY_CTRL_CLR,
    152 	    USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE);
    153 	delay(100);
    154 
    155 	/* power on */
    156 	USBPHY_WRITE(sc, USBPHY_PWD, 0);
    157 
    158 	/* UTMI+Level2, Level3 */
    159 	USBPHY_WRITE(sc, USBPHY_CTRL_SET,
    160 	    USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
    161 
    162 	return 0;
    163 }
    164 
    165