1 /*
2  * (C) Copyright 2008-2011 Michal Simek <monstr@monstr.eu>
3  * Clean driver and add xilinx constant from header file
4  *
5  * (C) Copyright 2004 Atmark Techno, Inc.
6  * Yasushi SHOJI <yashi@atmark-techno.com>
7  *
8  * SPDX-License-Identifier:	GPL-2.0+
9  */
10 
11 #include <config.h>
12 #include <common.h>
13 #include <asm/io.h>
14 #include <linux/compiler.h>
15 #include <serial.h>
16 
17 #define SR_TX_FIFO_FULL		0x08 /* transmit FIFO full */
18 #define SR_RX_FIFO_VALID_DATA	0x01 /* data in receive FIFO */
19 #define SR_RX_FIFO_FULL		0x02 /* receive FIFO full */
20 
21 struct uartlite {
22 	unsigned int rx_fifo;
23 	unsigned int tx_fifo;
24 	unsigned int status;
25 };
26 
27 static struct uartlite *userial_ports[4] = {
28 #ifdef XILINX_UARTLITE_BASEADDR
29 	[0] = (struct uartlite *)XILINX_UARTLITE_BASEADDR,
30 #endif
31 #ifdef XILINX_UARTLITE_BASEADDR1
32 	[1] = (struct uartlite *)XILINX_UARTLITE_BASEADDR1,
33 #endif
34 #ifdef XILINX_UARTLITE_BASEADDR2
35 	[2] = (struct uartlite *)XILINX_UARTLITE_BASEADDR2,
36 #endif
37 #ifdef XILINX_UARTLITE_BASEADDR3
38 	[3] = (struct uartlite *)XILINX_UARTLITE_BASEADDR3
39 #endif
40 };
41 
42 void uartlite_serial_putc(const char c, const int port)
43 {
44 	struct uartlite *regs = userial_ports[port];
45 
46 	if (c == '\n')
47 		uartlite_serial_putc('\r', port);
48 
49 	while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
50 		;
51 	out_be32(&regs->tx_fifo, c & 0xff);
52 }
53 
54 void uartlite_serial_puts(const char *s, const int port)
55 {
56 	while (*s)
57 		uartlite_serial_putc(*s++, port);
58 }
59 
60 int uartlite_serial_getc(const int port)
61 {
62 	struct uartlite *regs = userial_ports[port];
63 
64 	while (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
65 		;
66 	return in_be32(&regs->rx_fifo) & 0xff;
67 }
68 
69 int uartlite_serial_tstc(const int port)
70 {
71 	struct uartlite *regs = userial_ports[port];
72 
73 	return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
74 }
75 
76 static int uartlite_serial_init(const int port)
77 {
78 	if (userial_ports[port])
79 		return 0;
80 	return -1;
81 }
82 
83 /* Multi serial device functions */
84 #define DECLARE_ESERIAL_FUNCTIONS(port) \
85 	int userial##port##_init(void) \
86 				{ return uartlite_serial_init(port); } \
87 	void userial##port##_setbrg(void) {} \
88 	int userial##port##_getc(void) \
89 				{ return uartlite_serial_getc(port); } \
90 	int userial##port##_tstc(void) \
91 				{ return uartlite_serial_tstc(port); } \
92 	void userial##port##_putc(const char c) \
93 				{ uartlite_serial_putc(c, port); } \
94 	void userial##port##_puts(const char *s) \
95 				{ uartlite_serial_puts(s, port); }
96 
97 /* Serial device descriptor */
98 #define INIT_ESERIAL_STRUCTURE(port, __name) {	\
99 	.name	= __name,			\
100 	.start	= userial##port##_init,		\
101 	.stop	= NULL,				\
102 	.setbrg	= userial##port##_setbrg,	\
103 	.getc	= userial##port##_getc,		\
104 	.tstc	= userial##port##_tstc,		\
105 	.putc	= userial##port##_putc,		\
106 	.puts	= userial##port##_puts,		\
107 }
108 
109 DECLARE_ESERIAL_FUNCTIONS(0);
110 struct serial_device uartlite_serial0_device =
111 	INIT_ESERIAL_STRUCTURE(0, "ttyUL0");
112 DECLARE_ESERIAL_FUNCTIONS(1);
113 struct serial_device uartlite_serial1_device =
114 	INIT_ESERIAL_STRUCTURE(1, "ttyUL1");
115 DECLARE_ESERIAL_FUNCTIONS(2);
116 struct serial_device uartlite_serial2_device =
117 	INIT_ESERIAL_STRUCTURE(2, "ttyUL2");
118 DECLARE_ESERIAL_FUNCTIONS(3);
119 struct serial_device uartlite_serial3_device =
120 	INIT_ESERIAL_STRUCTURE(3, "ttyUL3");
121 
122 __weak struct serial_device *default_serial_console(void)
123 {
124 	if (userial_ports[0])
125 		return &uartlite_serial0_device;
126 	if (userial_ports[1])
127 		return &uartlite_serial1_device;
128 	if (userial_ports[2])
129 		return &uartlite_serial2_device;
130 	if (userial_ports[3])
131 		return &uartlite_serial3_device;
132 
133 	return NULL;
134 }
135 
136 void uartlite_serial_initialize(void)
137 {
138 #ifdef XILINX_UARTLITE_BASEADDR
139 	serial_register(&uartlite_serial0_device);
140 #endif /* XILINX_UARTLITE_BASEADDR */
141 #ifdef XILINX_UARTLITE_BASEADDR1
142 	serial_register(&uartlite_serial1_device);
143 #endif /* XILINX_UARTLITE_BASEADDR1 */
144 #ifdef XILINX_UARTLITE_BASEADDR2
145 	serial_register(&uartlite_serial2_device);
146 #endif /* XILINX_UARTLITE_BASEADDR2 */
147 #ifdef XILINX_UARTLITE_BASEADDR3
148 	serial_register(&uartlite_serial3_device);
149 #endif /* XILINX_UARTLITE_BASEADDR3 */
150 }
151