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      1 /* $NetBSD: bcm2835_com_acpi.c,v 1.2 2021/08/08 18:55:12 jmcneill Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2021 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      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. The name of the author may not be used to endorse or promote products
     13  *    derived from this software without specific prior written permission.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     20  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     22  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: bcm2835_com_acpi.c,v 1.2 2021/08/08 18:55:12 jmcneill Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/device.h>
     33 #include <sys/systm.h>
     34 #include <sys/termios.h>
     35 
     36 #include <dev/acpi/acpivar.h>
     37 #include <dev/acpi/acpi_intr.h>
     38 
     39 #include <dev/ic/comvar.h>
     40 
     41 #include <arm/broadcom/bcm2835_mbox.h>
     42 #include <evbarm/rpi/vcio.h>
     43 #include <evbarm/rpi/vcprop.h>
     44 
     45 static int	bcmcom_acpi_match(device_t, cfdata_t , void *);
     46 static void	bcmcom_acpi_attach(device_t, device_t, void *);
     47 
     48 static u_int	bcmcom_acpi_get_clockrate(device_t);
     49 
     50 struct vcmbox_clockrate_request {
     51 	struct vcprop_buffer_hdr	vb_hdr;
     52 	struct vcprop_tag_clockrate	vbt_clockrate;
     53 	struct vcprop_tag end;
     54 } __packed;
     55 
     56 CFATTACH_DECL_NEW(bcmcom_acpi, sizeof(struct com_softc), bcmcom_acpi_match,
     57     bcmcom_acpi_attach, NULL, NULL);
     58 
     59 static const struct device_compatible_entry compat_data[] = {
     60 	{ .compat = "BCM2836",		.value = COM_TYPE_BCMAUXUART },
     61 	DEVICE_COMPAT_EOL
     62 };
     63 
     64 static int
     65 bcmcom_acpi_match(device_t parent, cfdata_t match, void *aux)
     66 {
     67 	struct acpi_attach_args *aa = aux;
     68 
     69 	return acpi_compatible_match(aa, compat_data);
     70 }
     71 
     72 static void
     73 bcmcom_acpi_attach(device_t parent, device_t self, void *aux)
     74 {
     75 	struct com_softc *sc = device_private(self);
     76 	struct acpi_attach_args *aa = aux;
     77 	const struct device_compatible_entry *dce;
     78 	struct acpi_resources res;
     79 	struct acpi_mem *mem;
     80 	struct acpi_irq *irq;
     81 	bus_space_tag_t iot;
     82 	bus_space_handle_t ioh;
     83 	bus_addr_t base;
     84 	bus_size_t size;
     85 	ACPI_STATUS rv;
     86 	void *ih;
     87 
     88 	sc->sc_dev = self;
     89 
     90 	rv = acpi_resource_parse(sc->sc_dev, aa->aa_node->ad_handle, "_CRS",
     91 	    &res, &acpi_resource_parse_ops_default);
     92 	if (ACPI_FAILURE(rv)) {
     93 		return;
     94 	}
     95 
     96 	mem = acpi_res_mem(&res, 0);
     97 	if (mem == NULL) {
     98 		aprint_error_dev(self, "couldn't find mem resource\n");
     99 		goto cleanup;
    100 	}
    101 
    102 	iot = aa->aa_memt;
    103 	base = mem->ar_base + 0x40;
    104 	size = mem->ar_length - 0x40;
    105 
    106 	irq = acpi_res_irq(&res, 0);
    107 	if (irq == NULL) {
    108 		aprint_error_dev(self, "couldn't find irq resource\n");
    109 		goto cleanup;
    110 	}
    111 
    112 	dce = acpi_compatible_lookup(aa, compat_data);
    113 	KASSERT(dce != NULL);
    114 
    115 	sc->sc_type = dce->value;
    116 
    117 	if (!com_is_console(iot, base, &ioh)) {
    118 		if (bus_space_map(iot, base, size, 0, &ioh)) {
    119 			aprint_error_dev(self, "can't map mem space\n");
    120 			goto cleanup;
    121 		}
    122 	}
    123 
    124 	com_init_regs_stride(&sc->sc_regs, iot, ioh, base, 2);
    125 
    126 	aprint_normal("%s", device_xname(self));
    127 
    128 	sc->sc_frequency = bcmcom_acpi_get_clockrate(self);
    129 
    130 	com_attach_subr(sc);
    131 
    132 	ih = acpi_intr_establish(self,
    133 	    (uint64_t)(uintptr_t)aa->aa_node->ad_handle,
    134 	    IPL_SERIAL, true, comintr, sc, device_xname(self));
    135 	if (ih == NULL) {
    136 		aprint_error_dev(self, "couldn't establish interrupt\n");
    137 		goto cleanup;
    138 	}
    139 
    140 	if (!pmf_device_register(self, NULL, com_resume))
    141 		aprint_error_dev(self, "couldn't establish a power handler\n");
    142 
    143 cleanup:
    144 	acpi_resource_cleanup(&res);
    145 }
    146 
    147 static u_int
    148 bcmcom_acpi_get_clockrate(device_t dev)
    149 {
    150 	struct vcmbox_clockrate_request vb;
    151 	uint32_t res;
    152 	int error;
    153 
    154 	VCPROP_INIT_REQUEST(vb);
    155 	VCPROP_INIT_TAG(vb.vbt_clockrate, VCPROPTAG_GET_CLOCKRATE);
    156 	vb.vbt_clockrate.id = htole32(VCPROP_CLK_CORE);
    157 	error = bcmmbox_request(BCMMBOX_CHANARM2VC, &vb, sizeof(vb), &res);
    158 	if (error != 0) {
    159 		aprint_error_dev(dev, "MBOX request failed: %d\n", error);
    160 		return 0;
    161 	}
    162 	if (!vcprop_buffer_success_p(&vb.vb_hdr) ||
    163 	    !vcprop_tag_success_p(&vb.vbt_clockrate.tag)) {
    164 		return 0;
    165 	}
    166 
    167 	return le32toh(vb.vbt_clockrate.rate) * 2;
    168 }
    169