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      1 /*	$NetBSD: ph1_machdep.c,v 1.2 2026/08/02 16:45:28 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2026 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe.
      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: ph1_machdep.c,v 1.2 2026/08/02 16:45:28 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 
     39 #include <hb68k/pg68k/pgromcalls.h>
     40 
     41 #include <dev/ata/atavar.h>
     42 
     43 #include <dev/fdt/fdtvar.h>
     44 #include <dev/fdt/fdt_platform.h>
     45 
     46 #include <dev/ofw/openfirm.h>
     47 
     48 /*
     49  * plat_device_register --
     50  *	device_register() hook -- boot device detection and an
     51  *	opportunity to set any device properties as devices are
     52  *	attached during autoconfiguration.
     53  */
     54 static void
     55 ph1_plat_device_register(device_t dev, void *aux)
     56 {
     57 	extern device_t machine_booted_device;	/* XXX extern */
     58 	device_t parent = device_parent(dev);
     59 
     60 	static device_t booted_controller;
     61 	static paddr_t booted_controller_phys = (paddr_t)-1;
     62 	static int booted_unit = -1;
     63 	static bool initialized;
     64 
     65 	/*
     66 	 * The Phaethon 1 firmware provides several properties
     67 	 * in /chosen to help us find the boot device:
     68 	 *
     69 	 *	pg68k,booted-controller-type -- e.g. "ata"
     70 	 *	pg68k,booted-controller-phys -- phys addr of device
     71 	 *	pg68k,booted-unit            -- unit (i.e. drive) #
     72 	 *
     73 	 * We'll be concerned with pg68k,booted-controller-phys and
     74 	 * pg68k,booted-unit.
     75 	 */
     76 	if (! initialized) {
     77 		int chosen = OF_finddevice("/chosen");
     78 		uint32_t val;
     79 
     80 		if (chosen != -1) {
     81 			if (of_getprop_uint32(chosen,
     82 					      "pg68k,booted-controller-phys",
     83 					      &val) == 0) {
     84 				booted_controller_phys = val;
     85 			}
     86 			if (of_getprop_uint32(chosen,
     87 					      "pg68k,booted-unit",
     88 					      &val) == 0) {
     89 				booted_unit = val;
     90 			}
     91 		}
     92 		initialized = true;
     93 	}
     94 
     95 	if (booted_controller == NULL) {
     96 		if (device_is_a(parent, "simplebus")) {
     97 			struct fdt_attach_args *faa = aux;
     98 			bus_addr_t addr;
     99 			bus_size_t size;
    100 
    101 			if (fdtbus_get_reg(faa->faa_phandle,
    102 					   0, &addr, &size) != 0) {
    103 				return;
    104 			}
    105 
    106 			if (addr == booted_controller_phys) {
    107 				booted_controller = dev;
    108 			}
    109 		}
    110 		return;
    111 	}
    112 
    113 	if (machine_booted_device == NULL) {
    114 		if (device_is_a(dev, "wd") &&
    115 		    device_is_a(parent, "atabus") &&
    116 		    device_parent(parent) == booted_controller) {
    117 			struct ata_device *adev = aux;
    118 
    119 			if (adev->adev_drv_data->drive == booted_unit) {
    120 				machine_booted_device = dev;
    121 			}
    122 		}
    123 	}
    124 }
    125 
    126 /*
    127  * plat_halt --
    128  *	Halt the machine, returning back to the firmware monitor,
    129  *	if possible.
    130  */
    131 static void
    132 ph1_plat_halt(void)
    133 {
    134 	printf("Transferring control back to firmware...\n");
    135 	pgromcall_halt();
    136 }
    137 
    138 /*
    139  * plat_reboot --
    140  *	Reboot the system according to "howto".  Attempt to
    141  *	use "bootstr" as the arguments for the resulting system
    142  *	boot.
    143  */
    144 static void
    145 ph1_plat_reboot(int howto, char *bootstr)
    146 {
    147 	printf("Requesting reboot from firmware...\n");
    148 	pgromcall_reboot();
    149 }
    150 
    151 /*
    152  * plat_uart_freq --
    153  *	Return the console UART clock frequency in Hz.  This is
    154  *	called if the information is not available in the device
    155  *	tree.
    156  */
    157 static u_int
    158 ph1_plat_uart_freq(void)
    159 {
    160 	return 1843200;
    161 }
    162 
    163 static const struct fdt_platform phaethon1_platform = {
    164 	.fp_device_register = ph1_plat_device_register,
    165 	.fp_halt = ph1_plat_halt,
    166 	.fp_reboot = ph1_plat_reboot,
    167 	.fp_uart_freq = ph1_plat_uart_freq,
    168 };
    169 FDT_PLATFORM(phaethon1, "pg68k,cpu010-mk1", &phaethon1_platform);
    170