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[u-boot] / drivers / serial / serial_xuartlite.c
1 /*
2  * (C) Copyright 2008 - 2015 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 <dm.h>
14 #include <asm/io.h>
15 #include <linux/compiler.h>
16 #include <serial.h>
17
18 DECLARE_GLOBAL_DATA_PTR;
19
20 #define SR_TX_FIFO_FULL         BIT(3) /* transmit FIFO full */
21 #define SR_TX_FIFO_EMPTY        BIT(2) /* transmit FIFO empty */
22 #define SR_RX_FIFO_VALID_DATA   BIT(0) /* data in receive FIFO */
23 #define SR_RX_FIFO_FULL         BIT(1) /* receive FIFO full */
24
25 #define ULITE_CONTROL_RST_TX    0x01
26 #define ULITE_CONTROL_RST_RX    0x02
27
28 struct uartlite {
29         unsigned int rx_fifo;
30         unsigned int tx_fifo;
31         unsigned int status;
32         unsigned int control;
33 };
34
35 struct uartlite_platdata {
36         struct uartlite *regs;
37 };
38
39 static int uartlite_serial_putc(struct udevice *dev, const char ch)
40 {
41         struct uartlite_platdata *plat = dev_get_platdata(dev);
42         struct uartlite *regs = plat->regs;
43
44         if (in_be32(&regs->status) & SR_TX_FIFO_FULL)
45                 return -EAGAIN;
46
47         out_be32(&regs->tx_fifo, ch & 0xff);
48
49         return 0;
50 }
51
52 static int uartlite_serial_getc(struct udevice *dev)
53 {
54         struct uartlite_platdata *plat = dev_get_platdata(dev);
55         struct uartlite *regs = plat->regs;
56
57         if (!(in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA))
58                 return -EAGAIN;
59
60         return in_be32(&regs->rx_fifo) & 0xff;
61 }
62
63 static int uartlite_serial_pending(struct udevice *dev, bool input)
64 {
65         struct uartlite_platdata *plat = dev_get_platdata(dev);
66         struct uartlite *regs = plat->regs;
67
68         if (input)
69                 return in_be32(&regs->status) & SR_RX_FIFO_VALID_DATA;
70
71         return !(in_be32(&regs->status) & SR_TX_FIFO_EMPTY);
72 }
73
74 static int uartlite_serial_probe(struct udevice *dev)
75 {
76         struct uartlite_platdata *plat = dev_get_platdata(dev);
77         struct uartlite *regs = plat->regs;
78
79         out_be32(&regs->control, 0);
80         out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
81         in_be32(&regs->control);
82
83         return 0;
84 }
85
86 static int uartlite_serial_ofdata_to_platdata(struct udevice *dev)
87 {
88         struct uartlite_platdata *plat = dev_get_platdata(dev);
89
90         plat->regs = (struct uartlite *)dev_get_addr(dev);
91
92         return 0;
93 }
94
95 static const struct dm_serial_ops uartlite_serial_ops = {
96         .putc = uartlite_serial_putc,
97         .pending = uartlite_serial_pending,
98         .getc = uartlite_serial_getc,
99 };
100
101 static const struct udevice_id uartlite_serial_ids[] = {
102         { .compatible = "xlnx,opb-uartlite-1.00.b", },
103         { .compatible = "xlnx,xps-uartlite-1.00.a" },
104         { }
105 };
106
107 U_BOOT_DRIVER(serial_uartlite) = {
108         .name   = "serial_uartlite",
109         .id     = UCLASS_SERIAL,
110         .of_match = uartlite_serial_ids,
111         .ofdata_to_platdata = uartlite_serial_ofdata_to_platdata,
112         .platdata_auto_alloc_size = sizeof(struct uartlite_platdata),
113         .probe = uartlite_serial_probe,
114         .ops    = &uartlite_serial_ops,
115         .flags = DM_FLAG_PRE_RELOC,
116 };
117
118 #ifdef CONFIG_DEBUG_UART_UARTLITE
119
120 #include <debug_uart.h>
121
122 static inline void _debug_uart_init(void)
123 {
124         struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
125
126         out_be32(&regs->control, 0);
127         out_be32(&regs->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX);
128         in_be32(&regs->control);
129 }
130
131 static inline void _debug_uart_putc(int ch)
132 {
133         struct uartlite *regs = (struct uartlite *)CONFIG_DEBUG_UART_BASE;
134
135         while (in_be32(&regs->status) & SR_TX_FIFO_FULL)
136                 ;
137
138         out_be32(&regs->tx_fifo, ch & 0xff);
139 }
140
141 DEBUG_UART_FUNCS
142 #endif