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      1 /* $NetBSD: ti_otg.c,v 1.2 2021/01/27 03:10:20 thorpej Exp $ */
      2 /*
      3  * Copyright (c) 2013 Manuel Bouyer.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *	notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *	notice, this list of conditions and the following disclaimer in the
     12  *	documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: ti_otg.c,v 1.2 2021/01/27 03:10:20 thorpej Exp $");
     28 
     29 #include <sys/param.h>
     30 #include <sys/systm.h>
     31 #include <sys/device.h>
     32 #include <sys/conf.h>
     33 #include <sys/bus.h>
     34 #include <sys/proc.h>
     35 #include <sys/kernel.h>
     36 #include <sys/mutex.h>
     37 #include <sys/condvar.h>
     38 
     39 #include <arm/ti/ti_prcm.h>
     40 #include <arm/ti/ti_otgreg.h>
     41 
     42 #include <dev/fdt/fdtvar.h>
     43 
     44 static const struct device_compatible_entry compat_data[] = {
     45 	{ .compat = "ti,am33xx-usb" },
     46 	DEVICE_COMPAT_EOL
     47 };
     48 
     49 struct tiotg_softc {
     50 	device_t		sc_dev;
     51 	bus_space_tag_t		sc_iot;
     52 	bus_space_handle_t	sc_ioh;
     53 	bus_dma_tag_t		sc_dmat;
     54 	void *			sc_ih;
     55 };
     56 
     57 static int	tiotg_match(device_t, cfdata_t, void *);
     58 static void	tiotg_attach(device_t, device_t, void *);
     59 
     60 CFATTACH_DECL_NEW(ti_otg, sizeof(struct tiotg_softc),
     61     tiotg_match, tiotg_attach, NULL, NULL);
     62 
     63 static int
     64 tiotg_match(device_t parent, cfdata_t match, void *aux)
     65 {
     66 	struct fdt_attach_args * const faa = aux;
     67 
     68 	return of_compatible_match(faa->faa_phandle, compat_data);
     69 }
     70 
     71 static void
     72 tiotg_attach(device_t parent, device_t self, void *aux)
     73 {
     74 	struct tiotg_softc *sc = device_private(self);
     75 	struct fdt_attach_args * const faa = aux;
     76 	const int phandle = faa->faa_phandle;
     77 	bus_addr_t addr;
     78 	bus_size_t size;
     79 	uint32_t val;
     80 
     81 	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
     82 		aprint_error(": couldn't get registers\n");
     83 		return;
     84 	}
     85 
     86 	sc->sc_iot = faa->faa_bst;
     87 	sc->sc_dmat = faa->faa_dmat;
     88 	sc->sc_dev = self;
     89 
     90 	if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh) != 0) {
     91 		aprint_error(": couldn't map registers\n");
     92 		return;
     93 	}
     94 
     95 	aprint_normal(": TI dual-port USB controller");
     96 
     97 #if 0
     98 	/* XXX this looks wrong */
     99 	prcm_write_4(AM335X_PRCM_CM_WKUP, CM_WKUP_CM_CLKDCOLDO_DPLL_PER,
    100 	    CM_WKUP_CM_CLKDCOLDO_DPLL_PER_CLKDCOLDO_GATE_CTRL|
    101 	    CM_WKUP_CM_CLKDCOLDO_DPLL_PER_CLKDCOLDO_ST);
    102 
    103 	prcm_write_4(AM335X_PRCM_CM_PER, CM_PER_USB0_CLKCTRL, 2);
    104 	while ((prcm_read_4(AM335X_PRCM_CM_PER, CM_PER_USB0_CLKCTRL) & 0x3) != 2)
    105 		delay(10);
    106 
    107 	while (prcm_read_4(AM335X_PRCM_CM_PER, CM_PER_USB0_CLKCTRL) & (3<<16))
    108 		delay(10);
    109 #endif
    110 
    111 	/* reset module */
    112 	TIOTG_USBSS_WRITE4(sc, USBSS_SYSCONFIG, USBSS_SYSCONFIG_SRESET);
    113 	while (TIOTG_USBSS_READ4(sc, USBSS_SYSCONFIG) & USBSS_SYSCONFIG_SRESET)
    114 		delay(10);
    115 	val = TIOTG_USBSS_READ4(sc, USBSS_REVREG);
    116 	aprint_normal(": version v%d.%d.%d.%d",
    117 	    (val >> 11) & 15, (val >> 8) & 7, (val >> 6) & 3, val & 63);
    118 	aprint_normal("\n");
    119 
    120 	/* enable clock */
    121 	if (ti_prcm_enable_hwmod(phandle, 0) != 0) {
    122 		aprint_error(": couldn't enable module\n");
    123 		return;
    124 	}
    125 
    126 	fdt_add_bus(self, phandle, faa);
    127 }
    128