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exynos_platform.c revision 1.10 
      1 /* $NetBSD: exynos_platform.c,v 1.10 2018/07/02 12:49:37 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 Jared D. 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 "opt_exynos.h"
     30 #include "opt_multiprocessor.h"
     31 #include "opt_fdt_arm.h"
     32 
     33 #include "ukbd.h"
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: exynos_platform.c,v 1.10 2018/07/02 12:49:37 jmcneill Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/bus.h>
     40 #include <sys/cpu.h>
     41 #include <sys/device.h>
     42 #include <sys/termios.h>
     43 
     44 #include <dev/fdt/fdtvar.h>
     45 
     46 #include <uvm/uvm_extern.h>
     47 
     48 #include <machine/bootconfig.h>
     49 #include <arm/cpufunc.h>
     50 
     51 #include <arm/samsung/exynos_reg.h>
     52 #include <arm/samsung/exynos_var.h>
     53 #include <arm/samsung/mct_var.h>
     54 
     55 #include <evbarm/exynos/platform.h>
     56 
     57 #include <arm/fdt/arm_fdtvar.h>
     58 
     59 #define	EXYNOS5_SWRESET_REG	0x10040400
     60 
     61 static const struct pmap_devmap *
     62 exynos_platform_devmap(void)
     63 {
     64 	static const struct pmap_devmap devmap[] = {
     65 		DEVMAP_ENTRY(EXYNOS_CORE_VBASE,
     66 			     EXYNOS_CORE_PBASE,
     67 			     EXYNOS5_CORE_SIZE),
     68 		DEVMAP_ENTRY(EXYNOS5_AUDIOCORE_VBASE,
     69 			     EXYNOS5_AUDIOCORE_PBASE,
     70 			     EXYNOS5_AUDIOCORE_SIZE),
     71 		DEVMAP_ENTRY_END
     72 	};
     73 
     74 	return devmap;
     75 }
     76 
     77 #define EXYNOS_IOPHYSTOVIRT(a) \
     78     ((vaddr_t)(((a) - EXYNOS_CORE_PBASE) + EXYNOS_CORE_VBASE))
     79 
     80 static void
     81 exynos_platform_bootstrap(void)
     82 {
     83 	paddr_t uart_address = armreg_tpidruro_read();	/* XXX */
     84 	exynos_bootstrap(EXYNOS_CORE_VBASE, EXYNOS_IOPHYSTOVIRT(uart_address));
     85 }
     86 
     87 static void
     88 exynos_platform_init_attach_args(struct fdt_attach_args *faa)
     89 {
     90 	extern struct bus_space armv7_generic_bs_tag;
     91 	extern struct bus_space armv7_generic_a4x_bs_tag;
     92 	extern struct arm32_bus_dma_tag arm_generic_dma_tag;
     93 
     94 	faa->faa_bst = &armv7_generic_bs_tag;
     95 	faa->faa_a4x_bst = &armv7_generic_a4x_bs_tag;
     96 	faa->faa_dmat = &arm_generic_dma_tag;
     97 }
     98 
     99 static void
    100 exynos_platform_early_putchar(char c)
    101 {
    102 #if defined(VERBOSE_INIT_ARM)
    103 	extern void exynos_putchar(int);	/* XXX from exynos_start.S */
    104 
    105 	exynos_putchar(c);
    106 #endif
    107 }
    108 
    109 static void
    110 exynos_platform_device_register(device_t self, void *aux)
    111 {
    112 	exynos_device_register(self, aux);
    113 }
    114 
    115 static void
    116 exynos5_platform_reset(void)
    117 {
    118 	bus_space_tag_t bst = &armv7_generic_bs_tag;
    119 	bus_space_handle_t bsh;
    120 
    121 	bus_space_map(bst, EXYNOS5_SWRESET_REG, 4, 0, &bsh);
    122 	bus_space_write_4(bst, bsh, 0, 1);
    123 }
    124 
    125 static u_int
    126 exynos_platform_uart_freq(void)
    127 {
    128 	return EXYNOS_UART_FREQ;
    129 }
    130 
    131 static const struct arm_platform exynos5_platform = {
    132 	.devmap = exynos_platform_devmap,
    133 	.bootstrap = exynos_platform_bootstrap,
    134 	.init_attach_args = exynos_platform_init_attach_args,
    135 	.early_putchar = exynos_platform_early_putchar,
    136 	.device_register = exynos_platform_device_register,
    137 	.reset = exynos5_platform_reset,
    138 	.delay = mct_delay,
    139 	.uart_freq = exynos_platform_uart_freq,
    140 };
    141 
    142 ARM_PLATFORM(exynos5, "samsung,exynos5", &exynos5_platform);
    143