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arm_platform.c revision 1.2.6.2 
      1 /* $NetBSD: arm_platform.c,v 1.2.6.2 2020/04/08 14:07:29 martin Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2020 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 /*
     30  * This is the default Arm FDT platform implementation. It assumes the
     31  * following:
     32  *
     33  *  - Generic timer
     34  *  - PSCI support
     35  *  - Console UART is pre-configured by firmware
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: arm_platform.c,v 1.2.6.2 2020/04/08 14:07:29 martin Exp $");
     40 
     41 #include <sys/param.h>
     42 #include <sys/bus.h>
     43 #include <sys/cpu.h>
     44 #include <sys/device.h>
     45 #include <sys/termios.h>
     46 
     47 #include <dev/fdt/fdtvar.h>
     48 #include <arm/fdt/arm_fdtvar.h>
     49 
     50 #include <uvm/uvm_extern.h>
     51 
     52 #include <machine/bootconfig.h>
     53 
     54 #include <arm/cpufunc.h>
     55 
     56 #include <arm/cortex/gtmr_var.h>
     57 
     58 #include <arm/arm/psci.h>
     59 #include <arm/fdt/psci_fdtvar.h>
     60 
     61 #include <libfdt.h>
     62 
     63 #include <arch/evbarm/fdt/platform.h>
     64 
     65 extern struct arm32_bus_dma_tag arm_generic_dma_tag;
     66 extern struct bus_space arm_generic_bs_tag;
     67 extern struct bus_space arm_generic_a4x_bs_tag;
     68 
     69 static void
     70 arm_platform_init_attach_args(struct fdt_attach_args *faa)
     71 {
     72 	faa->faa_bst = &arm_generic_bs_tag;
     73 	faa->faa_a4x_bst = &arm_generic_a4x_bs_tag;
     74 	faa->faa_dmat = &arm_generic_dma_tag;
     75 }
     76 
     77 static void
     78 arm_platform_device_register(device_t self, void *aux)
     79 {
     80 }
     81 
     82 static const struct pmap_devmap *
     83 arm_platform_devmap(void)
     84 {
     85 	static const struct pmap_devmap devmap_empty[] = {
     86 		DEVMAP_ENTRY_END
     87 	};
     88 	static struct pmap_devmap devmap_uart[] = {
     89 		DEVMAP_ENTRY(KERNEL_IO_VBASE, 0, PAGE_SIZE),
     90 		DEVMAP_ENTRY_END
     91 	};
     92 	bus_addr_t uart_base;
     93 
     94 	const int phandle = fdtbus_get_stdout_phandle();
     95 	if (phandle <= 0)
     96 		return devmap_empty;
     97 
     98 	if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0)
     99 		return devmap_empty;
    100 
    101 	devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base);
    102 
    103 	return devmap_uart;
    104 }
    105 
    106 static u_int
    107 arm_platform_uart_freq(void)
    108 {
    109 	return 0;
    110 }
    111 
    112 static const struct arm_platform arm_platform = {
    113 	.ap_devmap = arm_platform_devmap,
    114 	.ap_bootstrap = arm_fdt_cpu_bootstrap,
    115 	.ap_init_attach_args = arm_platform_init_attach_args,
    116 	.ap_device_register = arm_platform_device_register,
    117 	.ap_reset = psci_fdt_reset,
    118 	.ap_delay = gtmr_delay,
    119 	.ap_uart_freq = arm_platform_uart_freq,
    120 	.ap_mpstart = arm_fdt_cpu_mpstart,
    121 };
    122 
    123 ARM_PLATFORM(arm, ARM_PLATFORM_DEFAULT, &arm_platform);
    124