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      1 /* $NetBSD: gtmr_fdt.c,v 1.12 2021/11/12 21:59:05 jmcneill 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 1.12 2021/11/12 21:59:05 jmcneill 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 #if defined(__arm__)
     48 #include <arm/armreg.h>
     49 #endif
     50 
     51 static int	gtmr_fdt_match(device_t, cfdata_t, void *);
     52 static void	gtmr_fdt_attach(device_t, device_t, void *);
     53 
     54 static void	gtmr_fdt_cpu_hatch(void *, struct cpu_info *);
     55 
     56 CFATTACH_DECL_NEW(gtmr_fdt, 0, gtmr_fdt_match, gtmr_fdt_attach, NULL, NULL);
     57 
     58 /* The virtual timer list entry */
     59 #define GTMR_VTIMER 2
     60 
     61 static const struct device_compatible_entry compat_data[] = {
     62 	{ .compat = "arm,armv7-timer" },
     63 	{ .compat = "arm,armv8-timer" },
     64 	DEVICE_COMPAT_EOL
     65 };
     66 
     67 static int
     68 gtmr_fdt_match(device_t parent, cfdata_t cf, void *aux)
     69 {
     70 	struct fdt_attach_args * const faa = aux;
     71 
     72 	return of_compatible_match(faa->faa_phandle, compat_data);
     73 }
     74 
     75 static void
     76 gtmr_fdt_attach(device_t parent, device_t self, void *aux)
     77 {
     78 	aprint_naive("\n");
     79 	aprint_normal(": Generic Timer\n");
     80 
     81 	struct mpcore_attach_args mpcaa = {
     82 		.mpcaa_name = "armgtmr",
     83 		.mpcaa_irq = -1		/* setup handler locally */
     84 	};
     85 	struct fdt_attach_args * const faa = aux;
     86 	const int phandle = faa->faa_phandle;
     87 
     88 	char intrstr[128];
     89 	if (!fdtbus_intr_str(phandle, GTMR_VTIMER, intrstr, sizeof(intrstr))) {
     90 		aprint_error(": failed to decode interrupt\n");
     91 		return;
     92 	}
     93 
     94 	void *ih = fdtbus_intr_establish_xname(phandle, GTMR_VTIMER, IPL_CLOCK,
     95 	    FDT_INTR_MPSAFE, gtmr_intr, NULL, device_xname(self));
     96 	if (ih == NULL) {
     97 		aprint_error_dev(self, "couldn't install interrupt handler\n");
     98 		return;
     99 	}
    100 	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
    101 
    102 #if defined(__arm__)
    103 	/*
    104 	 * If arm,cpu-registers-not-fw-configured is present, we need
    105 	 * to initialize cntfrq from the clock-frequency property. Only
    106 	 * applicable on Armv7.
    107 	 */
    108 	if (of_hasprop(phandle, "arm,cpu-registers-not-fw-configured")) {
    109 		uint32_t freq;
    110 
    111 		if (of_getprop_uint32(phandle, "clock-frequency", &freq) == 0) {
    112 			armreg_cnt_frq_write(freq);
    113 			prop_dictionary_set_bool(device_properties(self),
    114 			    "arm,cpu-registers-not-fw-configured", true);
    115 		}
    116 	}
    117 #endif
    118 
    119 	config_found(self, &mpcaa, NULL, CFARGS_NONE);
    120 
    121 	arm_fdt_cpu_hatch_register(self, gtmr_fdt_cpu_hatch);
    122 	arm_fdt_timer_register(gtmr_cpu_initclocks);
    123 }
    124 
    125 static void
    126 gtmr_fdt_cpu_hatch(void *priv, struct cpu_info *ci)
    127 {
    128 	gtmr_init_cpu_clock(ci);
    129 }
    130