1 /*
2 * Copyright (c) 2019 Winner Microelectronics Co., Ltd.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2018-11-9 fanwenl 1st version
9 */
10
11 #include <rtdevice.h>
12 #include <rtthread.h>
13 #include "board.h"
14 #include "wm_i2c.h"
15 #include "wm_io.h"
16 #include "wm_gpio_afsel.h"
17 #include "pin_map.h"
18 #include "drv_i2c.h"
19
20 #ifdef BSP_USING_I2C
21
22 struct wm_i2c_bus
23 {
24 struct rt_i2c_bus_device parent;
25 struct rt_i2c_msg *msg;
26 rt_uint32_t msg_cnt;
27 volatile rt_uint32_t msg_ptr;
28 volatile rt_uint32_t dptr;
29 };
30
31 static struct wm_i2c_bus wm_i2c;
32
33 static rt_ssize_t wm_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
34 struct rt_i2c_msg msgs[],
35 rt_uint32_t num);
36 static rt_ssize_t wm_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
37 struct rt_i2c_msg msgs[],
38 rt_uint32_t num);
39 static rt_err_t wm_i2c_bus_control(struct rt_i2c_bus_device *bus,
40 int cmd,
41 void *args);
42
43 static const struct rt_i2c_bus_device_ops wm_i2c_ops =
44 {
45 wm_i2c_mst_xfer,
46 wm_i2c_slv_xfer,
47 wm_i2c_bus_control,
48 };
49
wm_i2c_send_address(struct rt_i2c_bus_device * bus,struct rt_i2c_msg * msg)50 static rt_err_t wm_i2c_send_address(struct rt_i2c_bus_device *bus,
51 struct rt_i2c_msg *msg)
52 {
53 uint8_t addr_msb, addr_lsb;
54
55 if (msg->flags & RT_I2C_ADDR_10BIT)
56 {
57 addr_msb = 0xf0 | ((msg->addr >> 7) & 0x06);
58 addr_lsb = msg->addr & 0xff;
59
60 if (msg->flags & RT_I2C_RD)
61 {
62 addr_msb |= 0x01;
63 }
64 tls_i2c_write_byte(addr_msb, 1);
65 tls_i2c_wait_ack();
66 tls_i2c_write_byte(addr_lsb, 0);
67 tls_i2c_wait_ack();
68 }
69 else
70 {
71 tls_i2c_write_byte((msg->addr << 1) | msg->flags, 1);
72 tls_i2c_wait_ack();
73 }
74
75 return RT_EOK;
76 }
77
wm_i2c_mst_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)78 static rt_ssize_t wm_i2c_mst_xfer(struct rt_i2c_bus_device *bus,
79 struct rt_i2c_msg msgs[],
80 rt_uint32_t num)
81 {
82 struct wm_i2c_bus *wm_i2c;
83 rt_size_t i;
84 RT_ASSERT(bus != RT_NULL);
85 wm_i2c = (struct wm_i2c_bus *)bus;
86
87 wm_i2c->msg = msgs;
88 wm_i2c->msg_ptr = 0;
89 wm_i2c->msg_cnt = num;
90 wm_i2c->dptr = 0;
91
92 for (i = 0; i < wm_i2c->msg_cnt; i++)
93 {
94 if (!(wm_i2c->msg[i].flags & RT_I2C_NO_START))
95 {
96 wm_i2c_send_address(bus, &(wm_i2c->msg[i]));
97 }
98 if (wm_i2c->msg[i].flags & RT_I2C_RD)
99 {
100 while (wm_i2c->msg[i].len > 1)
101 {
102 *wm_i2c->msg[i].buf++ = tls_i2c_read_byte(1, 0);
103 wm_i2c->msg[i].len--;
104 }
105 *wm_i2c->msg[i].buf = tls_i2c_read_byte(0, 0);
106 }
107 else
108 {
109 while (wm_i2c->msg[i].len > 0)
110 {
111 tls_i2c_write_byte(*wm_i2c->msg[i].buf, 0);
112 tls_i2c_wait_ack();
113 wm_i2c->msg[i].len--;
114 wm_i2c->msg[i].buf++;
115 }
116 }
117 }
118 wm_i2c->msg = RT_NULL;
119 wm_i2c->msg_ptr = 0;
120 wm_i2c->msg_cnt = 0;
121 wm_i2c->dptr = 0;
122
123 tls_i2c_stop();
124 for (int j = 0; j < 3000; j++);
125
126 return i;
127 }
wm_i2c_slv_xfer(struct rt_i2c_bus_device * bus,struct rt_i2c_msg msgs[],rt_uint32_t num)128 static rt_ssize_t wm_i2c_slv_xfer(struct rt_i2c_bus_device *bus,
129 struct rt_i2c_msg msgs[],
130 rt_uint32_t num)
131 {
132 return 0;
133 }
wm_i2c_bus_control(struct rt_i2c_bus_device * bus,int cmd,void * args)134 static rt_err_t wm_i2c_bus_control(struct rt_i2c_bus_device *bus,
135 int cmd,
136 void *args)
137 {
138 return -RT_ERROR;
139 }
140
WM_I2C_IRQHandler(void)141 void WM_I2C_IRQHandler(void)
142 {
143 extern void I2C_IRQHandler(void);
144 /* enter interrupt */
145 rt_interrupt_enter();
146
147 I2C_IRQHandler();
148
149 /* leave interrupt */
150 rt_interrupt_leave();
151 }
152
wm_hw_i2c_init(void)153 int wm_hw_i2c_init(void)
154 {
155 rt_int16_t gpio_pin;
156
157 gpio_pin = wm_get_pin(WM_I2C_SCL_PIN);
158 if (gpio_pin >= 0)
159 {
160 wm_i2c_scl_config((enum tls_io_name)gpio_pin);
161 }
162 gpio_pin = wm_get_pin(WM_I2C_DAT_PIN);
163 if (gpio_pin >= 0)
164 {
165 wm_i2c_sda_config((enum tls_io_name)gpio_pin);
166 }
167
168 tls_i2c_init(WM_HW_I2C_FREQ);
169
170 wm_i2c.parent.ops = &wm_i2c_ops;
171 #ifdef WM_I2C_BUS_NAME
172 rt_i2c_bus_device_register(&wm_i2c.parent, WM_I2C_BUS_NAME);
173 #else
174 rt_i2c_bus_device_register(&wm_i2c.parent, "i2c");
175 #endif
176
177 return 0;
178 }
179 INIT_DEVICE_EXPORT(wm_hw_i2c_init);
180
181 #endif /* BSP_USING_I2C */
182