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exynos_platform.c revision 1.6 
      1 /* $NetBSD: exynos_platform.c,v 1.6 2017/06/20 19:13:34 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 1.6 2017/06/20 19:13:34 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 
     54 #include <evbarm/exynos/platform.h>
     55 
     56 #include <arm/cortex/gtmr_var.h>
     57 
     58 #include <arm/fdt/arm_fdtvar.h>
     59 
     60 #define	EXYNOS5_SWRESET_REG	0x10040400
     61 
     62 #define	DEVMAP_ALIGN(a)	((a) & ~L1_S_OFFSET)
     63 #define	DEVMAP_SIZE(s)	roundup2((s), L1_S_SIZE)
     64 #define	DEVMAP_ENTRY(va, pa, sz)			\
     65 	{						\
     66 		.pd_va = DEVMAP_ALIGN(va),		\
     67 		.pd_pa = DEVMAP_ALIGN(pa),		\
     68 		.pd_size = DEVMAP_SIZE(sz),		\
     69 		.pd_prot = VM_PROT_READ|VM_PROT_WRITE,	\
     70 		.pd_cache = PTE_NOCACHE			\
     71 	}
     72 #define	DEVMAP_ENTRY_END	{ 0 }
     73 
     74 static const struct pmap_devmap *
     75 exynos_platform_devmap(void)
     76 {
     77 	static const struct pmap_devmap devmap[] = {
     78 		DEVMAP_ENTRY(EXYNOS_CORE_VBASE,
     79 			     EXYNOS_CORE_PBASE,
     80 			     EXYNOS5_CORE_SIZE),
     81 		DEVMAP_ENTRY(EXYNOS5_AUDIOCORE_VBASE,
     82 			     EXYNOS5_AUDIOCORE_PBASE,
     83 			     EXYNOS5_AUDIOCORE_SIZE),
     84 		DEVMAP_ENTRY_END
     85 	};
     86 
     87 	return devmap;
     88 }
     89 
     90 #define EXYNOS_IOPHYSTOVIRT(a) \
     91     ((vaddr_t)(((a) - EXYNOS_CORE_PBASE) + EXYNOS_CORE_VBASE))
     92 
     93 static void
     94 exynos_platform_bootstrap(void)
     95 {
     96 	paddr_t uart_address = armreg_tpidruro_read();	/* XXX */
     97 	exynos_bootstrap(EXYNOS_CORE_VBASE, EXYNOS_IOPHYSTOVIRT(uart_address));
     98 }
     99 
    100 static void
    101 exynos_platform_init_attach_args(struct fdt_attach_args *faa)
    102 {
    103 	extern struct bus_space armv7_generic_bs_tag;
    104 	extern struct bus_space armv7_generic_a4x_bs_tag;
    105 	extern struct arm32_bus_dma_tag armv7_generic_dma_tag;
    106 
    107 	faa->faa_bst = &armv7_generic_bs_tag;
    108 	faa->faa_a4x_bst = &armv7_generic_a4x_bs_tag;
    109 	faa->faa_dmat = &armv7_generic_dma_tag;
    110 }
    111 
    112 static void
    113 exynos_platform_early_putchar(char c)
    114 {
    115 #if defined(VERBOSE_INIT_ARM)
    116 	extern void exynos_putchar(int);	/* XXX from exynos_start.S */
    117 
    118 	exynos_putchar(c);
    119 #endif
    120 }
    121 
    122 static void
    123 exynos_platform_device_register(device_t self, void *aux)
    124 {
    125 	exynos_device_register(self, aux);
    126 }
    127 
    128 static void
    129 exynos5_platform_reset(void)
    130 {
    131 	bus_space_tag_t bst = &armv7_generic_bs_tag;
    132 	bus_space_handle_t bsh;
    133 
    134 	bus_space_map(bst, EXYNOS5_SWRESET_REG, 4, 0, &bsh);
    135 	bus_space_write_4(bst, bsh, 0, 1);
    136 }
    137 
    138 static void
    139 exynos_platform_delay(u_int us)
    140 {
    141 	gtmr_delay(us);
    142 }
    143 
    144 static u_int
    145 exynos_platform_uart_freq(void)
    146 {
    147 	return EXYNOS_UART_FREQ;
    148 }
    149 
    150 static const struct arm_platform exynos5_platform = {
    151 	.devmap = exynos_platform_devmap,
    152 	.bootstrap = exynos_platform_bootstrap,
    153 	.init_attach_args = exynos_platform_init_attach_args,
    154 	.early_putchar = exynos_platform_early_putchar,
    155 	.device_register = exynos_platform_device_register,
    156 	.reset = exynos5_platform_reset,
    157 	.delay = exynos_platform_delay,
    158 	.uart_freq = exynos_platform_uart_freq,
    159 };
    160 
    161 ARM_PLATFORM(exynos5, "samsung,exynos5", &exynos5_platform);
    162