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ti_motgphy.c revision 1.3 
      1 /* $NetBSD: ti_motgphy.c,v 1.3 2026/07/30 15:08:08 yurix Exp $ */
      2 /*-
      3  * Copyright (c) 2026 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Yuri Honegger and Brook Milligan.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 /*
     32  * Driver for the USB phy on TI AM335X SoCs.
     33  *
     34  * While we implement fdt_phy, we only have support for enabling all phys at
     35  * once. Enabling individual phys is possible, but it requires parsing the alias
     36  * name of the phy node, which is beyond ugly. Furthermore, the usb controller
     37  * doesn't support suspend/resume, so we only ever enable the phy. If the need
     38  * for a full phy implementation arises, it should be possible to extend the
     39  * driver without much restructuring.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: ti_motgphy.c,v 1.3 2026/07/30 15:08:08 yurix Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/bus.h>
     47 #include <sys/device.h>
     48 
     49 #include <arm/ti/ti_otgreg.h>
     50 
     51 #include <dev/fdt/fdtvar.h>
     52 
     53 struct ti_motgphy_softc {
     54 	bus_space_tag_t		sc_bst;
     55 	bus_space_handle_t	sc_bsh;
     56 };
     57 
     58 static int	ti_motgphy_match(device_t, cfdata_t, void *);
     59 static void	ti_motgphy_attach(device_t, device_t, void *);
     60 static void *	ti_motgphy_acquire(device_t, const void *, size_t);
     61 static void	ti_motgphy_release(device_t, void *);
     62 static int	ti_motgphy_enable(device_t, void *, bool);
     63 
     64 #define	PHY_READ(sc, reg)					\
     65 	bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, reg)
     66 #define	PHY_WRITE(sc, reg, val)					\
     67 	bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, reg, val)
     68 
     69 CFATTACH_DECL_NEW(timotgphy, sizeof(struct ti_motgphy_softc), ti_motgphy_match,
     70     ti_motgphy_attach, NULL, NULL);
     71 
     72 static const struct fdtbus_phy_controller_func ti_motgphy_funcs = {
     73 	.acquire = &ti_motgphy_acquire,
     74 	.release = &ti_motgphy_release,
     75 	.enable = &ti_motgphy_enable,
     76 };
     77 
     78 static const struct device_compatible_entry compat_data[] = {
     79 	{ .compat = "ti,am335x-usb-phy" },
     80 	DEVICE_COMPAT_EOL
     81 };
     82 
     83 static int
     84 ti_motgphy_match(device_t parent, cfdata_t match, void *aux)
     85 {
     86 	struct fdt_attach_args * const faa = aux;
     87 
     88 	return of_compatible_match(faa->faa_phandle, compat_data);
     89 }
     90 
     91 static void
     92 ti_motgphy_attach(device_t parent, device_t self, void *aux)
     93 {
     94 	struct ti_motgphy_softc *sc = device_private(self);
     95 	struct fdt_attach_args *const faa = aux;
     96 	const int phandle = faa->faa_phandle;
     97 	int ctrl_phandle;
     98 	bus_addr_t addr;
     99 	bus_size_t size;
    100 
    101 	ctrl_phandle = fdtbus_get_phandle(phandle, "ti,ctrl_mod");
    102 	if (ctrl_phandle < 0) {
    103 		aprint_error(": failed to get usb phy ctrl module\n");
    104 		return;
    105 	}
    106 
    107 	if (fdtbus_get_reg_byname(ctrl_phandle, "phy_ctrl", &addr, &size)) {
    108 		aprint_error(": couldn't get registers\n");
    109 		return;
    110 	}
    111 
    112 	sc->sc_bst = faa->faa_bst;
    113 	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
    114 		aprint_error(": couldn't map registers\n");
    115 		return;
    116 	}
    117 
    118 	aprint_normal("\n");
    119 	aprint_naive("\n");
    120 
    121 	fdtbus_register_phy_controller(self, phandle, &ti_motgphy_funcs);
    122 }
    123 
    124 static void *
    125 ti_motgphy_acquire(device_t self, const void *data, size_t len)
    126 {
    127 	KASSERT(len == 0);
    128 	return device_private(self);
    129 }
    130 
    131 static void
    132 ti_motgphy_release(device_t self, void *priv)
    133 {
    134 	/* do nothing */
    135 }
    136 
    137 static int
    138 ti_motgphy_enable(device_t self, void *priv, bool enable)
    139 {
    140 	struct ti_motgphy_softc * const sc = priv;
    141 
    142 	/*
    143 	 * We only support enabling the phy, and even then we always enable both
    144 	 * phys at once.
    145 	 */
    146 	KASSERT(enable);
    147 	uint32_t usb_ctrl;
    148 	for (int i = 0; i < 2; ++i) {
    149 		usb_ctrl = PHY_READ(sc, CM_USBCTRL(i));
    150 		usb_ctrl &= ~(CM_USBCTRL_CM_PWRDN | CM_USBCTRL_OTG_PWRDN);
    151 		usb_ctrl |= (CM_USBCTRL_OTGVDET_EN | CM_USBCTRL_OTGSESSENDEN);
    152 		PHY_WRITE(sc, CM_USBCTRL(i), usb_ctrl);
    153 	}
    154 
    155 	return 0;
    156 }
    157 
    158