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imx6_usbphy.c revision 1.1.2.3 
      1 /*	$NetBSD: imx6_usbphy.c,v 1.1.2.3 2021/04/03 22:28:17 thorpej 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 1.1.2.3 2021/04/03 22:28:17 thorpej 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 	DEVICE_COMPAT_EOL
     67 };
     68 
     69 static int
     70 imx6_usbphy_match(device_t parent, cfdata_t cf, void *aux)
     71 {
     72 	struct fdt_attach_args * const faa = aux;
     73 
     74 	return of_compatible_match(faa->faa_phandle, compat_data);
     75 }
     76 
     77 static void
     78 imx6_usbphy_attach(device_t parent, device_t self, void *aux)
     79 {
     80 	struct imx6_usbphy_softc *sc = device_private(self);
     81 	struct fdt_attach_args * const faa = aux;
     82 	const int phandle = faa->faa_phandle;
     83 	bus_space_tag_t bst = faa->faa_bst;
     84 	bus_space_handle_t bsh;
     85 	bus_addr_t addr;
     86 	bus_size_t size;
     87 	int error;
     88 
     89 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     90 		aprint_error(": couldn't get iomux registers\n");
     91 		return;
     92 	}
     93 
     94 	error = bus_space_map(bst, addr, size, 0, &bsh);
     95 	if (error) {
     96 		aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error);
     97 		return;
     98 	}
     99 
    100 	sc->sc_clk = fdtbus_clock_get_index(phandle, 0);
    101 	if (sc->sc_clk == NULL) {
    102 		aprint_error(": couldn't get clock\n");
    103 		return;
    104 	}
    105 
    106 	sc->sc_dev = self;
    107 	sc->sc_iot = bst;
    108 	sc->sc_ioh = bsh;
    109 
    110 	aprint_naive("\n");
    111 	aprint_normal(": USB PHY\n");
    112 
    113 	imx6_usbphy_init_clocks(self);
    114 	imx6_usbphy_enable(self, NULL, true);
    115 }
    116 
    117 static int
    118 imx6_usbphy_init_clocks(device_t dev)
    119 {
    120 	struct imx6_usbphy_softc * const sc = device_private(dev);
    121 	int error;
    122 
    123 	error = clk_enable(sc->sc_clk);
    124 	if (error) {
    125 		aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error);
    126 		return error;
    127 	}
    128 
    129 	return 0;
    130 }
    131 
    132 #define	USBPHY_READ(sc, reg)						      \
    133 	bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))
    134 #define	USBPHY_WRITE(sc, reg, val)					      \
    135 	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
    136 
    137 static int
    138 imx6_usbphy_enable(device_t dev, void *priv, bool enable)
    139 {
    140 	struct imx6_usbphy_softc * const sc = device_private(dev);
    141 
    142 	/* USBPHY enable */
    143 	USBPHY_WRITE(sc, USBPHY_CTRL, USBPHY_CTRL_CLKGATE);
    144 
    145 	/* do reset */
    146 	USBPHY_WRITE(sc, USBPHY_CTRL_SET, USBPHY_CTRL_SFTRST);
    147 	delay(100);
    148 
    149 	/* clear reset, and run clocks */
    150 	USBPHY_WRITE(sc, USBPHY_CTRL_CLR,
    151 	    USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE);
    152 	delay(100);
    153 
    154 	/* power on */
    155 	USBPHY_WRITE(sc, USBPHY_PWD, 0);
    156 
    157 	/* UTMI+Level2, Level3 */
    158 	USBPHY_WRITE(sc, USBPHY_CTRL_SET,
    159 	    USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
    160 
    161 	return 0;
    162 }
    163 
    164