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      1 /* $NetBSD: gtmr_acpi.c,v 1.5 2021/08/07 16:18:42 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jared McNeill <jmcneill (at) invisible.ca>.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: gtmr_acpi.c,v 1.5 2021/08/07 16:18:42 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/cpu.h>
     38 #include <sys/device.h>
     39 
     40 #include <dev/acpi/acpireg.h>
     41 #include <dev/acpi/acpivar.h>
     42 
     43 #include <arm/cortex/gtmr_intr.h>
     44 #include <arm/cortex/mpcore_var.h>
     45 #include <arm/cortex/gtmr_var.h>
     46 
     47 #include <dev/fdt/fdtvar.h>
     48 #include <arm/fdt/arm_fdtvar.h>
     49 
     50 extern struct bus_space arm_generic_bs_tag;
     51 
     52 static int	gtmr_acpi_match(device_t, cfdata_t, void *);
     53 static void	gtmr_acpi_attach(device_t, device_t, void *);
     54 
     55 static void	gtmr_acpi_cpu_hatch(void *, struct cpu_info *);
     56 
     57 CFATTACH_DECL_NEW(gtmr_acpi, 0, gtmr_acpi_match, gtmr_acpi_attach, NULL, NULL);
     58 
     59 static int
     60 gtmr_acpi_match(device_t parent, cfdata_t cf, void *aux)
     61 {
     62 	ACPI_TABLE_HEADER *hdrp = aux;
     63 
     64 	return memcmp(hdrp->Signature, ACPI_SIG_GTDT, ACPI_NAMESEG_SIZE) == 0;
     65 }
     66 
     67 static void
     68 gtmr_acpi_attach(device_t parent, device_t self, void *aux)
     69 {
     70 	ACPI_TABLE_GTDT *gtdt = aux;
     71 	struct mpcore_attach_args mpcaa;
     72 	void *ih;
     73 
     74 	const int irq = gtdt->VirtualTimerInterrupt;
     75 	const int ipl = IPL_CLOCK;
     76 	const int type = (gtdt->VirtualTimerFlags & ACPI_GTDT_INTERRUPT_MODE) ?
     77 	    IST_EDGE : IST_LEVEL;
     78 
     79 	aprint_naive("\n");
     80 	aprint_normal(": irq %d\n", irq);
     81 
     82 	ih = intr_establish_xname(irq, ipl, type | IST_MPSAFE, gtmr_intr, NULL, device_xname(self));
     83 	if (ih == NULL) {
     84 		aprint_error_dev(self, "couldn't install interrupt handler\n");
     85 		return;
     86 	}
     87 
     88 	memset(&mpcaa, 0, sizeof(mpcaa));
     89 	mpcaa.mpcaa_name = "armgtmr";
     90 	mpcaa.mpcaa_irq = -1;
     91 	config_found(self, &mpcaa, NULL, CFARGS_NONE);
     92 
     93 	arm_fdt_cpu_hatch_register(self, gtmr_acpi_cpu_hatch);
     94 	arm_fdt_timer_register(gtmr_cpu_initclocks);
     95 }
     96 
     97 static void
     98 gtmr_acpi_cpu_hatch(void *priv, struct cpu_info *ci)
     99 {
    100 	gtmr_init_cpu_clock(ci);
    101 }
    102