]> git.sur5r.net Git - u-boot/blob - drivers/serial/serial_xuartlite.c
Merge branch 'iu-boot/master' into 'u-boot-arm/master'
[u-boot] / drivers / serial / serial_xuartlite.c
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 static 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 static void uartlite_serial_puts(const char *s, const int port)
55 {
56         while (*s)
57                 uartlite_serial_putc(*s++, port);
58 }
59
60 static 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 static 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         static int userial##port##_init(void) \
86                                 { return uartlite_serial_init(port); } \
87         static void userial##port##_setbrg(void) {} \
88         static int userial##port##_getc(void) \
89                                 { return uartlite_serial_getc(port); } \
90         static int userial##port##_tstc(void) \
91                                 { return uartlite_serial_tstc(port); } \
92         static void userial##port##_putc(const char c) \
93                                 { uartlite_serial_putc(c, port); } \
94         static 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 }