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gtmr_fdt.c revision 1.7.2.2 
      1 /* $NetBSD: gtmr_fdt.c,v 1.7.2.2 2017/12/03 11:35:52 jdolecek Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 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. 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(0, "$NetBSD: gtmr_fdt.c,v 1.7.2.2 2017/12/03 11:35:52 jdolecek Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/device.h>
     35 #include <sys/intr.h>
     36 #include <sys/systm.h>
     37 #include <sys/kernel.h>
     38 #include <sys/kmem.h>
     39 
     40 #include <arm/cortex/gtmr_intr.h>
     41 #include <arm/cortex/mpcore_var.h>
     42 #include <arm/cortex/gtmr_var.h>
     43 
     44 #include <dev/fdt/fdtvar.h>
     45 #include <arm/fdt/arm_fdtvar.h>
     46 
     47 static int	gtmr_fdt_match(device_t, cfdata_t, void *);
     48 static void	gtmr_fdt_attach(device_t, device_t, void *);
     49 
     50 static void	gtmr_fdt_cpu_hatch(void *, struct cpu_info *);
     51 
     52 CFATTACH_DECL_NEW(gtmr_fdt, 0, gtmr_fdt_match, gtmr_fdt_attach, NULL, NULL);
     53 
     54 /* The virtual timer list entry */
     55 #define GTMR_VTIMER 2
     56 
     57 static int
     58 gtmr_fdt_match(device_t parent, cfdata_t cf, void *aux)
     59 {
     60 	const char * const compatible[] = {
     61 		"arm,armv7-timer",
     62 		"arm,armv8-timer",
     63 		NULL
     64 	};
     65 	struct fdt_attach_args * const faa = aux;
     66 
     67 	return of_compatible(faa->faa_phandle, compatible) >= 0;
     68 }
     69 
     70 static void
     71 gtmr_fdt_attach(device_t parent, device_t self, void *aux)
     72 {
     73 	aprint_naive("\n");
     74 	aprint_normal(": Generic Timer\n");
     75 
     76 	struct mpcore_attach_args mpcaa = {
     77 		.mpcaa_name = "armgtmr",
     78 		.mpcaa_irq = -1		/* setup handler locally */
     79 	};
     80 	struct fdt_attach_args * const faa = aux;
     81 	const int phandle = faa->faa_phandle;
     82 
     83 	char intrstr[128];
     84 	if (!fdtbus_intr_str(phandle, GTMR_VTIMER, intrstr, sizeof(intrstr))) {
     85 		aprint_error(": failed to decode interrupt\n");
     86 		return;
     87 	}
     88 
     89 	void *ih = fdtbus_intr_establish(phandle, GTMR_VTIMER, IPL_CLOCK,
     90 	    FDT_INTR_MPSAFE, gtmr_intr, NULL);
     91 	if (ih == NULL) {
     92 		aprint_error_dev(self, "couldn't install interrupt handler\n");
     93 		return;
     94 	}
     95 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
     96 
     97 	config_found(self, &mpcaa, NULL);
     98 
     99 	arm_fdt_cpu_hatch_register(self, gtmr_fdt_cpu_hatch);
    100 	arm_fdt_timer_register(gtmr_cpu_initclocks);
    101 }
    102 
    103 static void
    104 gtmr_fdt_cpu_hatch(void *priv, struct cpu_info *ci)
    105 {
    106 	gtmr_init_cpu_clock(ci);
    107 }
    108