1 /*
2 * Copyright (c) 2019-2020, Socionext Inc. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8
9 #include <drivers/console.h>
10 #include <errno.h>
11 #include <lib/mmio.h>
12 #include <plat/common/platform.h>
13
14 #include "uniphier.h"
15 #include "uniphier_console.h"
16
17 #define UNIPHIER_UART_OFFSET 0x100
18 #define UNIPHIER_UART_NR_PORTS 4
19
20 /* These callbacks are implemented in assembly to use crash_console_helpers.S */
21 int uniphier_console_putc(int character, struct console *console);
22 int uniphier_console_getc(struct console *console);
23 void uniphier_console_flush(struct console *console);
24
25 static console_t uniphier_console = {
26 .flags = CONSOLE_FLAG_BOOT |
27 #if DEBUG
28 CONSOLE_FLAG_RUNTIME |
29 #endif
30 CONSOLE_FLAG_CRASH |
31 CONSOLE_FLAG_TRANSLATE_CRLF,
32 .putc = uniphier_console_putc,
33 .getc = uniphier_console_getc,
34 .flush = uniphier_console_flush,
35 };
36
37 static const uintptr_t uniphier_uart_base[] = {
38 [UNIPHIER_SOC_LD11] = 0x54006800,
39 [UNIPHIER_SOC_LD20] = 0x54006800,
40 [UNIPHIER_SOC_PXS3] = 0x54006800,
41 };
42
43 /*
44 * There are 4 UART ports available on this platform. By default, we want to
45 * use the same one as used in the previous firmware stage.
46 */
uniphier_console_get_base(unsigned int soc)47 static uintptr_t uniphier_console_get_base(unsigned int soc)
48 {
49 uintptr_t base, end;
50 uint32_t div;
51
52 assert(soc < ARRAY_SIZE(uniphier_uart_base));
53 base = uniphier_uart_base[soc];
54 end = base + UNIPHIER_UART_OFFSET * UNIPHIER_UART_NR_PORTS;
55
56 while (base < end) {
57 div = mmio_read_32(base + UNIPHIER_UART_DLR);
58 if (div)
59 return base;
60 base += UNIPHIER_UART_OFFSET;
61 }
62
63 return 0;
64 }
65
uniphier_console_init(uintptr_t base)66 static void uniphier_console_init(uintptr_t base)
67 {
68 mmio_write_32(base + UNIPHIER_UART_FCR, UNIPHIER_UART_FCR_ENABLE_FIFO);
69 mmio_write_32(base + UNIPHIER_UART_LCR_MCR,
70 UNIPHIER_UART_LCR_WLEN8 << 8);
71 }
72
uniphier_console_setup(unsigned int soc)73 void uniphier_console_setup(unsigned int soc)
74 {
75 uintptr_t base;
76
77 base = uniphier_console_get_base(soc);
78 if (!base)
79 plat_error_handler(-EINVAL);
80
81 uniphier_console.base = base;
82 console_register(&uniphier_console);
83
84 /*
85 * The hardware might be still printing characters queued up in the
86 * previous firmware stage. Make sure the transmitter is empty before
87 * any initialization. Otherwise, the console might get corrupted.
88 */
89 console_flush();
90
91 uniphier_console_init(base);
92 }
93