1 /* $NetBSD: arm_platform.c,v 1.7 2023/04/07 08:55:30 skrll Exp $ */
2
3 /*-
4 * Copyright (c) 2020 Jared McNeill <jmcneill@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 "opt_console.h"
39
40 #include <sys/cdefs.h>
41 __KERNEL_RCSID(0, "$NetBSD: arm_platform.c,v 1.7 2023/04/07 08:55:30 skrll Exp $");
42
43 #include <sys/param.h>
44 #include <sys/bus.h>
45 #include <sys/cpu.h>
46 #include <sys/device.h>
47 #include <sys/termios.h>
48
49 #include <dev/fdt/fdtvar.h>
50
51 #include <uvm/uvm_extern.h>
52
53 #include <machine/bootconfig.h>
54
55 #include <arm/cpufunc.h>
56
57 #include <arm/cortex/gtmr_var.h>
58
59 #include <arm/arm/psci.h>
60
61 #include <arm/fdt/arm_fdtvar.h>
62 #include <arm/fdt/psci_fdtvar.h>
63
64 #include <evbarm/dev/plcomreg.h>
65 #include <evbarm/dev/plcomvar.h>
66
67 #include <libfdt.h>
68
69 #include <arch/evbarm/fdt/platform.h>
70
71 extern struct arm32_bus_dma_tag arm_generic_dma_tag;
72 extern struct bus_space arm_generic_bs_tag;
73
74 void plcom_platform_early_putchar(char);
75
76 #define ARM_PTOV(p) (((p) - DEVMAP_ALIGN(uart_base)) + KERNEL_IO_VBASE)
77
78 void __noasan
plcom_platform_early_putchar(char c)79 plcom_platform_early_putchar(char c)
80 {
81 #ifdef CONSADDR
82 bus_addr_t uart_base = CONSADDR;
83
84 volatile uint32_t *uartaddr = cpu_earlydevice_va_p() ?
85 (volatile uint32_t *)ARM_PTOV(uart_base):
86 (volatile uint32_t *)uart_base;
87
88 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFF) != 0)
89 continue;
90
91 uartaddr[PL01XCOM_DR / 4] = htole32(c);
92 dsb(sy);
93
94 while ((le32toh(uartaddr[PL01XCOM_FR / 4]) & PL01X_FR_TXFE) == 0)
95 continue;
96 #endif
97 }
98
99 static void
arm_platform_init_attach_args(struct fdt_attach_args * faa)100 arm_platform_init_attach_args(struct fdt_attach_args *faa)
101 {
102 faa->faa_bst = &arm_generic_bs_tag;
103 faa->faa_dmat = &arm_generic_dma_tag;
104 }
105
106 static void
arm_platform_device_register(device_t self,void * aux)107 arm_platform_device_register(device_t self, void *aux)
108 {
109 }
110
111 static const struct pmap_devmap *
arm_platform_devmap(void)112 arm_platform_devmap(void)
113 {
114 static const struct pmap_devmap devmap_empty[] = {
115 DEVMAP_ENTRY_END
116 };
117 static struct pmap_devmap devmap_uart[] = {
118 DEVMAP_ENTRY(KERNEL_IO_VBASE, 0, PAGE_SIZE),
119 DEVMAP_ENTRY_END
120 };
121
122 const int phandle = fdtbus_get_stdout_phandle();
123 if (phandle <= 0)
124 return devmap_empty;
125
126 bus_addr_t uart_base;
127 if (fdtbus_get_reg(phandle, 0, &uart_base, NULL) != 0)
128 return devmap_empty;
129
130 devmap_uart[0].pd_pa = DEVMAP_ALIGN(uart_base);
131
132 return devmap_uart;
133 }
134
135 static u_int
arm_platform_uart_freq(void)136 arm_platform_uart_freq(void)
137 {
138 return 0;
139 }
140
141 static const struct fdt_platform arm_platform = {
142 .fp_devmap = arm_platform_devmap,
143 .fp_bootstrap = arm_fdt_cpu_bootstrap,
144 .fp_init_attach_args = arm_platform_init_attach_args,
145 .fp_device_register = arm_platform_device_register,
146 .fp_reset = psci_fdt_reset,
147 .fp_delay = gtmr_delay,
148 .fp_uart_freq = arm_platform_uart_freq,
149 .fp_mpstart = arm_fdt_cpu_mpstart,
150 };
151
152 FDT_PLATFORM(arm, FDT_PLATFORM_DEFAULT, &arm_platform);
153