1 /*
2 * Copyright (c) 2015 Google Inc. All rights reserved
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #include <kernel/thread.h>
25 #include <kernel/vm.h>
26 #include <lib/device_tree/libfdt_helpers.h>
27 #include <lk/reg.h>
28 #include <lk/types.h>
29 #include <platform/debug.h>
30
31 #include "debug.h"
32
33 #if GENERIC_ARM64_DEBUG_SMC_DEBUG_PUTC
34 #include "smc.h"
35 #endif
36
37 #if GENERIC_ARM64_DEBUG_FFA
38 #include <lib/arm_ffa/arm_ffa.h>
39 #endif
40
41 #if GENERIC_ARM64_DEBUG_UART
42 enum uart_type {
43 UART_NONE,
44 UART_PL011,
45 UART_8250,
46 };
47
48 static uint8_t* uart_base;
49 static enum uart_type uart_type;
50
map_uart(paddr_t reg_paddr,enum uart_type new_uart_type)51 static void map_uart(paddr_t reg_paddr, enum uart_type new_uart_type) {
52 int ret;
53 void* page_vaddr;
54
55 ASSERT(!uart_base);
56
57 paddr_t reg_pbase = round_down(reg_paddr, PAGE_SIZE);
58 ret = vmm_alloc_physical(
59 vmm_get_kernel_aspace(), "uart", PAGE_SIZE, &page_vaddr, 0,
60 reg_pbase, 0,
61 ARCH_MMU_FLAG_PERM_NO_EXECUTE | ARCH_MMU_FLAG_UNCACHED_DEVICE);
62 if (ret) {
63 return;
64 }
65 uart_type = new_uart_type;
66 uart_base = (uint8_t*)page_vaddr + (reg_paddr - reg_pbase);
67 }
68
generic_arm64_setup_uart(void * fdt)69 void generic_arm64_setup_uart(void* fdt) {
70 enum uart_type uart_type;
71 int fdt_chosen_offset = fdt_path_offset(fdt, "/chosen");
72 int fdt_stdout_path_len;
73 const char* fdt_stdout_path = fdt_getprop(
74 fdt, fdt_chosen_offset, "stdout-path", &fdt_stdout_path_len);
75 if (!fdt_stdout_path) {
76 return;
77 }
78 int fdt_stdout_offset = fdt_path_offset_namelen(fdt, fdt_stdout_path,
79 fdt_stdout_path_len - 1);
80
81 if (!fdt_node_check_compatible(fdt, fdt_stdout_offset, "arm,pl011")) {
82 uart_type = UART_PL011;
83 } else if (!fdt_node_check_compatible(fdt, fdt_stdout_offset, "ns8250") ||
84 !fdt_node_check_compatible(fdt, fdt_stdout_offset, "ns16550a")) {
85 uart_type = UART_8250;
86 } else {
87 return;
88 }
89
90 paddr_t uart_reg;
91 if (fdt_helper_get_reg(fdt, fdt_stdout_offset, 0, &uart_reg, NULL)) {
92 return;
93 }
94
95 map_uart(uart_reg, uart_type);
96 }
97 #endif
98
platform_dputc(char c)99 void platform_dputc(char c) {
100 #if GENERIC_ARM64_DEBUG_SMC_DEBUG_PUTC
101 generic_arm64_smc(SMC_FC_DEBUG_PUTC, (unsigned long)c, 0, 0);
102 #elif GENERIC_ARM64_DEBUG_FFA
103 arm_ffa_console_log(&c, 1);
104 #elif GENERIC_ARM64_DEBUG_UART
105 if (!uart_base) {
106 return;
107 }
108 if (uart_type == UART_8250) {
109 while (!(readb(uart_base + 5) & (1U << 5))) {
110 }
111 writeb(c, uart_base + 0);
112 } else if (uart_type == UART_PL011) {
113 while ((*REG16(uart_base + 0x018) & (1U << 5))) {
114 }
115 *REG16(uart_base + 0x000) = c;
116 }
117 #else
118 #error Unsupported GENERIC_ARM64_DEBUG mode
119 #endif
120 }
121
platform_dgetc(char * c,bool wait)122 int platform_dgetc(char* c, bool wait) {
123 int ret = -1;
124
125 while (wait)
126 thread_sleep(100);
127
128 return ret;
129 }
130