1 /*
2 * Copyright (c) 2006-2022, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2020-04-05 bigmagic Initial version
9 * 2020-10-28 ma Buadrate & Multi-Port support
10 */
11 /**
12 * @addtogroup ls2k
13 */
14 /*@{*/
15 #include <rtthread.h>
16 #include <rtdevice.h>
17 #include <rthw.h>
18 #include "drv_uart.h"
19 #define TRUE 1
20 #define FALSE 0
21 const struct serial_configure config_uart0 = {
22 BAUD_RATE_115200, /* 921600 bits/s */
23 DATA_BITS_8, /* 8 databits */
24 STOP_BITS_1, /* 1 stopbit */
25 PARITY_NONE, /* No parity */
26 BIT_ORDER_LSB, /* LSB first sent */
27 NRZ_NORMAL, /* Normal mode */
28 RT_SERIAL_RB_BUFSZ, /* Buffer size */
29 0
30 };
31 struct rt_uart_ls2k
32 {
33 void *base;
34 rt_uint32_t IRQ;
35 };
ls2k_uart_set_buad(struct rt_serial_device * serial,struct serial_configure * cfg)36 static rt_err_t ls2k_uart_set_buad(struct rt_serial_device *serial, struct serial_configure *cfg)
37 {
38 struct rt_uart_ls2k *uart_dev = RT_NULL;
39 rt_err_t ret = RT_EOK;
40 RT_ASSERT(serial != RT_NULL);
41 RT_ASSERT(cfg != RT_NULL);
42 uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
43 uint64_t brtc = (125000000U) / (16 * (cfg->baud_rate));
44 UART_LCR(uart_dev->base) = 0x80; // Activate buadcfg
45 UART_LSB(uart_dev->base) = brtc & 0xff;
46 UART_MSB(uart_dev->base) = brtc >> 8;
47 if (((((short)UART_MSB(uart_dev->base)) << 8) | UART_LSB(uart_dev->base)) != brtc) ret = -RT_ERROR;
48 UART_LCR(uart_dev->base) = CFCR_8BITS; // Back to normal
49 UART_MCR(uart_dev->base) = MCR_IENABLE/* | MCR_DTR | MCR_RTS*/;
50 UART_IER(uart_dev->base) = 0;
51 }
ls2k_uart_configure(struct rt_serial_device * serial,struct serial_configure * cfg)52 static rt_err_t ls2k_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
53 {
54 struct rt_uart_ls2k *uart_dev = RT_NULL;
55 RT_ASSERT(serial != RT_NULL);
56 RT_ASSERT(cfg != RT_NULL);
57 ls2k_uart_set_buad(serial, cfg);
58 uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
59 HWREG8(0xffffffffbfe10428) = 0x1f; // Enable Multi-Port Support, by default it's 0x11 ,which means UART0 & UART4 Controller is in single port mode.
60 UART_IER(uart_dev->base) = 0; /* clear interrupt */
61 UART_FCR(uart_dev->base) = 0xc1; /* reset UART Rx/Tx */
62 /* set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
63 UART_LCR(uart_dev->base) = 0x3;
64 UART_MCR(uart_dev->base) = 0x3;
65 UART_LSR(uart_dev->base) = 0x60;
66 UART_MSR(uart_dev->base) = 0xb0;
67 return RT_EOK;
68 }
ls2k_uart_control(struct rt_serial_device * serial,int cmd,void * arg)69 static rt_err_t ls2k_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
70 {
71 struct rt_uart_ls2k *uart_dev = RT_NULL;
72 RT_ASSERT(serial != RT_NULL);
73 uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
74 switch (cmd)
75 {
76 case RT_DEVICE_CTRL_CLR_INT: /* Disable RX IRQ */
77 rt_hw_interrupt_mask(uart_dev->IRQ);
78 break;
79 case RT_DEVICE_CTRL_SET_INT: /* Enable RX IRQ */
80 rt_hw_interrupt_umask(uart_dev->IRQ);
81 UART_IER(uart_dev->base) |= (IER_IRxE | IER_ILE);
82 break;
83 default:
84 break;
85 }
86 return RT_EOK;
87 }
uart_is_transmit_empty(struct rt_uart_ls2k * uart_dev)88 static rt_bool_t uart_is_transmit_empty(struct rt_uart_ls2k *uart_dev)
89 {
90 unsigned char status = UART_LSR(uart_dev->base);
91 if (status & (UARTLSR_TE | UARTLSR_TFE))
92 {
93 return TRUE;
94 }
95 else
96 {
97 return FALSE;
98 }
99 }
ls2k_uart_putc(struct rt_serial_device * serial,char c)100 static int ls2k_uart_putc(struct rt_serial_device *serial, char c)
101 {
102 struct rt_uart_ls2k *uart_dev = RT_NULL;
103 RT_ASSERT(serial != RT_NULL);
104 uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
105 while (FALSE == uart_is_transmit_empty(uart_dev))
106 ;
107 UART_DAT(uart_dev->base) = c;
108 return 1;
109 }
ls2k_uart_getc(struct rt_serial_device * serial)110 static int ls2k_uart_getc(struct rt_serial_device *serial)
111 {
112 struct rt_uart_ls2k *uart_dev = RT_NULL;
113 RT_ASSERT(serial != RT_NULL);
114 uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
115 if (LSR_RXRDY & UART_LSR(uart_dev->base))
116 {
117 return UART_DAT(uart_dev->base);
118 }
119 return -1;
120 }
121 /* UART interrupt handler */
uart_irq_handler(int vector,void * param)122 static void uart_irq_handler(int vector, void *param)
123 {
124 struct rt_serial_device *serial = (struct rt_serial_device *)param;
125 struct rt_uart_ls2k *uart_dev = RT_NULL;
126 RT_ASSERT(serial != RT_NULL);
127 uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
128 unsigned char iir = UART_IIR(uart_dev->base);
129 /* Find out interrupt reason */
130 if ((IIR_RXTOUT & iir) || (IIR_RXRDY & iir))
131 {
132 rt_interrupt_enter();
133 rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
134 rt_interrupt_leave();
135 }
136 }
137 static const struct rt_uart_ops ls2k_uart_ops =
138 {
139 ls2k_uart_configure,
140 ls2k_uart_control,
141 ls2k_uart_putc,
142 ls2k_uart_getc,
143 };
144 struct rt_uart_ls2k uart_dev0 =
145 {
146 (void *)UARTx_BASE(0),
147 LS2K_UART_0_1_2_3_IRQ,
148 };
149 struct rt_uart_ls2k uart_dev4 =
150 {
151 (void *)UARTx_BASE(4),
152 LS2K_UART_4_5_6_7_IRQ,
153 };
154
155 struct rt_serial_device serial, serial4;
156
rt_hw_uart_init(void)157 void rt_hw_uart_init(void)
158 {
159 struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
160
161 #ifdef RT_USING_UART0
162 struct rt_uart_ls2k *uart0;
163 uart0 = &uart_dev0;
164 serial.ops = &ls2k_uart_ops;
165 serial.config = config_uart0;
166
167 rt_hw_interrupt_install(uart0->IRQ, uart_irq_handler, &serial, "UART0");
168 /* register UART device */
169 rt_hw_serial_register(&serial,
170 "uart0",
171 RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
172 uart0);
173 #endif
174
175 #ifdef RT_USING_UART4
176 struct rt_uart_ls2k *uart4;
177 uart4 = &uart_dev4;
178 serial4.ops = &ls2k_uart_ops;
179 serial4.config = config;
180 rt_hw_interrupt_install(uart4->IRQ, uart_irq_handler, &serial4, "UART4");
181 rt_hw_serial_register(&serial4,
182 "uart4",
183 RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
184 &uart_dev4);
185 #endif
186 }
187 /*@}*/
188