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Antonio Nino Diaz01193242018-08-15 22:07:35 +01001/*
Carlo Caione189494a2019-08-23 18:28:36 +01002 * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved.
Antonio Nino Diaz01193242018-08-15 22:07:35 +01003 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7#include <asm_macros.S>
8#include <assert_macros.S>
Antonio Nino Diaz01193242018-08-15 22:07:35 +01009#include <console_macros.S>
Carlo Caione189494a2019-08-23 18:28:36 +010010#include <drivers/amlogic/meson_console.h>
Antonio Nino Diaz01193242018-08-15 22:07:35 +010011
12 .globl console_meson_register
13 .globl console_meson_init
14 .globl console_meson_putc
15 .globl console_meson_getc
16 .globl console_meson_flush
17 .globl console_meson_core_putc
18 .globl console_meson_core_getc
19 .globl console_meson_core_flush
20
21 /* -----------------------------------------------
22 * Hardware definitions
23 * -----------------------------------------------
24 */
25#define MESON_WFIFO_OFFSET 0x0
26#define MESON_RFIFO_OFFSET 0x4
27#define MESON_CONTROL_OFFSET 0x8
28#define MESON_STATUS_OFFSET 0xC
29#define MESON_MISC_OFFSET 0x10
30#define MESON_REG5_OFFSET 0x14
31
32#define MESON_CONTROL_CLR_ERROR_BIT 24
33#define MESON_CONTROL_RX_RESET_BIT 23
34#define MESON_CONTROL_TX_RESET_BIT 22
35#define MESON_CONTROL_RX_ENABLE_BIT 13
36#define MESON_CONTROL_TX_ENABLE_BIT 12
37
38#define MESON_STATUS_RX_EMPTY_BIT 20
39#define MESON_STATUS_TX_FULL_BIT 21
40#define MESON_STATUS_TX_EMPTY_BIT 22
41
42#define MESON_REG5_USE_XTAL_CLK_BIT 24
43#define MESON_REG5_USE_NEW_RATE_BIT 23
44#define MESON_REG5_NEW_BAUD_RATE_MASK 0x7FFFFF
45
46 /* -----------------------------------------------
47 * int console_meson_register(uintptr_t base,
48 * uint32_t clk, uint32_t baud,
49 * console_meson_t *console);
50 * Function to initialize and register a new MESON
51 * console. Storage passed in for the console struct
52 * *must* be persistent (i.e. not from the stack).
53 * In: x0 - UART register base address
54 * w1 - UART clock in Hz
55 * w2 - Baud rate
56 * x3 - pointer to empty console_meson_t struct
57 * Out: return 1 on success, 0 on error
58 * Clobber list : x0, x1, x2, x6, x7, x14
59 * -----------------------------------------------
60 */
61func console_meson_register
62 mov x7, x30
63 mov x6, x3
64 cbz x6, register_fail
65 str x0, [x6, #CONSOLE_T_MESON_BASE]
66
67 bl console_meson_init
68 cbz x0, register_fail
69
70 mov x0, x6
71 mov x30, x7
72 finish_console_register meson putc=1, getc=1, flush=1
73
74register_fail:
75 ret x7
76endfunc console_meson_register
77
78 /* -----------------------------------------------
79 * int console_meson_init(uintptr_t base_addr,
80 * unsigned int uart_clk, unsigned int baud_rate)
81 * Function to initialize the console without a
82 * C Runtime to print debug information. This
83 * function will be accessed by console_init and
84 * crash reporting.
85 * In: x0 - console base address
86 * w1 - Uart clock in Hz
87 * w2 - Baud rate
88 * Out: return 1 on success else 0 on error
89 * Clobber list : x0-x3
90 * -----------------------------------------------
91 */
92func console_meson_init
93 cmp w0, #0
94 beq init_fail
95 mov_imm w3, 24000000 /* TODO: This only works with a 24 MHz clock. */
96 cmp w1, w3
97 bne init_fail
98 cmp w2, #0
99 beq init_fail
100 /* Set baud rate: value = ((clock / 3) / baudrate) - 1 */
101 mov w3, #3
102 udiv w3, w1, w3
103 udiv w3, w3, w2
104 sub w3, w3, #1
105 orr w3, w3, #((1 << MESON_REG5_USE_XTAL_CLK_BIT) | \
106 (1 << MESON_REG5_USE_NEW_RATE_BIT))
107 str w3, [x0, #MESON_REG5_OFFSET]
108 /* Reset UART and clear error flag */
109 ldr w3, [x0, #MESON_CONTROL_OFFSET]
110 orr w3, w3, #((1 << MESON_CONTROL_CLR_ERROR_BIT) | \
111 (1 << MESON_CONTROL_RX_RESET_BIT) | \
112 (1 << MESON_CONTROL_TX_RESET_BIT))
113 str w3, [x0, #MESON_CONTROL_OFFSET]
114 bic w3, w3, #((1 << MESON_CONTROL_CLR_ERROR_BIT) | \
115 (1 << MESON_CONTROL_RX_RESET_BIT) | \
116 (1 << MESON_CONTROL_TX_RESET_BIT))
117 str w3, [x0, #MESON_CONTROL_OFFSET]
118 /* Enable transfer and receive FIFO */
119 orr w3, w3, #((1 << MESON_CONTROL_RX_ENABLE_BIT) | \
120 (1 << MESON_CONTROL_TX_ENABLE_BIT))
121 str w3, [x0, #MESON_CONTROL_OFFSET]
122 /* Success */
123 mov w0, #1
124 ret
125init_fail:
126 mov w0, wzr
127 ret
128endfunc console_meson_init
129
130 /* --------------------------------------------------------
131 * int console_meson_putc(int c, console_meson_t *console)
132 * Function to output a character over the console. It
133 * returns the character printed on success or -1 on error.
134 * In : w0 - character to be printed
135 * x1 - pointer to console_t structure
136 * Out : return -1 on error else return character.
137 * Clobber list : x2
138 * --------------------------------------------------------
139 */
140func console_meson_putc
141#if ENABLE_ASSERTIONS
142 cmp x1, #0
143 ASM_ASSERT(ne)
144#endif /* ENABLE_ASSERTIONS */
145 ldr x1, [x1, #CONSOLE_T_MESON_BASE]
146 b console_meson_core_putc
147endfunc console_meson_putc
148
149 /* --------------------------------------------------------
150 * int console_meson_core_putc(int c, uintptr_t base_addr)
151 * Function to output a character over the console. It
152 * returns the character printed on success or -1 on error.
153 * In : w0 - character to be printed
154 * x1 - console base address
155 * Out : return -1 on error else return character.
156 * Clobber list : x2
157 * --------------------------------------------------------
158 */
159func console_meson_core_putc
160#if ENABLE_ASSERTIONS
161 cmp x1, #0
162 ASM_ASSERT(ne)
163#endif
164 /* Prepend '\r' to '\n' */
165 cmp w0, #0xA
166 b.ne 2f
167 /* Wait until the transmit FIFO isn't full */
1681: ldr w2, [x1, #MESON_STATUS_OFFSET]
169 tbnz w2, #MESON_STATUS_TX_FULL_BIT, 1b
170 /* Write '\r' if needed */
171 mov w2, #0xD
172 str w2, [x1, #MESON_WFIFO_OFFSET]
173 /* Wait until the transmit FIFO isn't full */
1742: ldr w2, [x1, #MESON_STATUS_OFFSET]
175 tbnz w2, #MESON_STATUS_TX_FULL_BIT, 2b
176 /* Write input character */
177 str w0, [x1, #MESON_WFIFO_OFFSET]
178 ret
179endfunc console_meson_core_putc
180
181 /* ---------------------------------------------
182 * int console_meson_getc(console_meson_t *console)
183 * Function to get a character from the console.
184 * It returns the character grabbed on success
185 * or -1 if no character is available.
186 * In : x0 - pointer to console_t structure
187 * Out: w0 - character if available, else -1
188 * Clobber list : x0, x1
189 * ---------------------------------------------
190 */
191func console_meson_getc
192#if ENABLE_ASSERTIONS
193 cmp x0, #0
194 ASM_ASSERT(ne)
195#endif /* ENABLE_ASSERTIONS */
196 ldr x0, [x0, #CONSOLE_T_MESON_BASE]
197 b console_meson_core_getc
198endfunc console_meson_getc
199
200 /* ---------------------------------------------
201 * int console_meson_core_getc(uintptr_t base_addr)
202 * Function to get a character from the console.
203 * It returns the character grabbed on success
204 * or -1 if no character is available.
205 * In : x0 - console base address
206 * Out: w0 - character if available, else -1
207 * Clobber list : x0, x1
208 * ---------------------------------------------
209 */
210func console_meson_core_getc
211#if ENABLE_ASSERTIONS
212 cmp x0, #0
213 ASM_ASSERT(ne)
214#endif
215 /* Is the receive FIFO empty? */
216 ldr w1, [x0, #MESON_STATUS_OFFSET]
217 tbnz w1, #MESON_STATUS_RX_EMPTY_BIT, 1f
218 /* Read one character from the RX FIFO */
219 ldr w0, [x0, #MESON_RFIFO_OFFSET]
220 ret
2211:
222 mov w0, #ERROR_NO_PENDING_CHAR
223 ret
224endfunc console_meson_core_getc
225
226 /* ---------------------------------------------
227 * int console_meson_flush(console_meson_t *console)
228 * Function to force a write of all buffered
229 * data that hasn't been output.
230 * In : x0 - pointer to console_t structure
231 * Out : return -1 on error else return 0.
232 * Clobber list : x0, x1
233 * ---------------------------------------------
234 */
235func console_meson_flush
236#if ENABLE_ASSERTIONS
237 cmp x0, #0
238 ASM_ASSERT(ne)
239#endif /* ENABLE_ASSERTIONS */
240 ldr x0, [x0, #CONSOLE_T_MESON_BASE]
241 b console_meson_core_flush
242endfunc console_meson_flush
243
244 /* ---------------------------------------------
245 * int console_meson_core_flush(uintptr_t base_addr)
246 * Function to force a write of all buffered
247 * data that hasn't been output.
248 * In : x0 - console base address
249 * Out : return -1 on error else return 0.
250 * Clobber list : x0, x1
251 * ---------------------------------------------
252 */
253func console_meson_core_flush
254#if ENABLE_ASSERTIONS
255 cmp x0, #0
256 ASM_ASSERT(ne)
257#endif
258 /* Wait until the transmit FIFO is empty */
2591: ldr w1, [x0, #MESON_STATUS_OFFSET]
260 tbz w1, #MESON_STATUS_TX_EMPTY_BIT, 1b
261 mov w0, #0
262 ret
263endfunc console_meson_core_flush