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wrap030_machdep.c revision 1.1 
      1 /*	$NetBSD: wrap030_machdep.c,v 1.1 2026/08/06 14:41:09 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: wrap030_machdep.c,v 1.1 2026/08/06 14:41:09 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 
     39 #include <dev/fdt/fdtvar.h>
     40 #include <dev/fdt/fdt_platform.h>
     41 
     42 #include <uvm/uvm_extern.h>
     43 
     44 #include <m68k/mmu_30.h>
     45 
     46 /*
     47  * plat_bootstrap --
     48  *	Early bootstrap routine, mainly for the purpose of providing
     49  *	data necessary to configure the MMU.
     50  */
     51 static paddr_t
     52 wrap030_plat_bootstrap(paddr_t nextpa, vaddr_t reloff)
     53 {
     54 	/*
     55 	 * We're going to use TT0 to map all of the device address space,
     56 	 * which is located >= 0x80000000.  We have to:
     57 	 *
     58 	 *	- Initialize the TT register data.
     59 	 * and
     60 	 *	- Tell pmap_bootstrap1() about the TT-mapped region.
     61 	 */
     62 	uint32_t *tt = (uint32_t *)PMAP_BOOTSTRAP_RELOC_GLOB(mmu_tt30);
     63 	tt[MMU_TTREG_TT0] =
     64 	    0x80000000 |
     65 	    __SHIFTIN(0x7f,TT30_LAM) |
     66 	    TT30_E | TT30_CI | TT30_RWM |
     67 	    TT30_SUPERD;
     68 
     69 	struct pmap_bootmap *pmbm =
     70 	    (struct pmap_bootmap *)PMAP_BOOTSTRAP_RELOC_GLOB(machine_bootmap);
     71 	pmbm[0].pmbm_vaddr = 0x80000000;
     72 	pmbm[0].pmbm_size  = 0x80000000;
     73 	pmbm[0].pmbm_flags = PMBM_F_KEEPOUT;
     74 
     75 	return nextpa;
     76 }
     77 
     78 /*
     79  * plat_uart_freq --
     80  *	Return the console UART clock frequency in Hz.  This is
     81  *	called if the information is not available in the device
     82  *	tree.
     83  */
     84 static u_int
     85 wrap030_plat_uart_freq(void)
     86 {
     87 	return 1843200;
     88 }
     89 
     90 static const struct fdt_platform wrap030_platform = {
     91 	.fp_bootstrap = wrap030_plat_bootstrap,
     92 	.fp_uart_freq = wrap030_plat_uart_freq,
     93 };
     94 FDT_PLATFORM(wrap030, "techav,wrap030", &wrap030_platform);
     95