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9#include "qemu/osdep.h"
10#include "libqos/i2c.h"
11
12#include <glib.h>
13
14#include "qemu/bswap.h"
15#include "libqtest.h"
16
17enum OMAPI2CRegisters {
18 OMAP_I2C_REV = 0x00,
19 OMAP_I2C_STAT = 0x08,
20 OMAP_I2C_CNT = 0x18,
21 OMAP_I2C_DATA = 0x1c,
22 OMAP_I2C_CON = 0x24,
23 OMAP_I2C_SA = 0x2c,
24};
25
26enum OMAPI2CSTATBits {
27 OMAP_I2C_STAT_NACK = 1 << 1,
28 OMAP_I2C_STAT_ARDY = 1 << 2,
29 OMAP_I2C_STAT_RRDY = 1 << 3,
30 OMAP_I2C_STAT_XRDY = 1 << 4,
31 OMAP_I2C_STAT_ROVR = 1 << 11,
32 OMAP_I2C_STAT_SBD = 1 << 15,
33};
34
35enum OMAPI2CCONBits {
36 OMAP_I2C_CON_STT = 1 << 0,
37 OMAP_I2C_CON_STP = 1 << 1,
38 OMAP_I2C_CON_TRX = 1 << 9,
39 OMAP_I2C_CON_MST = 1 << 10,
40 OMAP_I2C_CON_BE = 1 << 14,
41 OMAP_I2C_CON_I2C_EN = 1 << 15,
42};
43
44typedef struct OMAPI2C {
45 I2CAdapter parent;
46
47 uint64_t addr;
48} OMAPI2C;
49
50
51static void omap_i2c_set_slave_addr(OMAPI2C *s, uint8_t addr)
52{
53 uint16_t data = addr;
54
55 writew(s->addr + OMAP_I2C_SA, data);
56 data = readw(s->addr + OMAP_I2C_SA);
57 g_assert_cmphex(data, ==, addr);
58}
59
60static void omap_i2c_send(I2CAdapter *i2c, uint8_t addr,
61 const uint8_t *buf, uint16_t len)
62{
63 OMAPI2C *s = (OMAPI2C *)i2c;
64 uint16_t data;
65
66 omap_i2c_set_slave_addr(s, addr);
67
68 data = len;
69 writew(s->addr + OMAP_I2C_CNT, data);
70
71 data = OMAP_I2C_CON_I2C_EN |
72 OMAP_I2C_CON_TRX |
73 OMAP_I2C_CON_MST |
74 OMAP_I2C_CON_STT |
75 OMAP_I2C_CON_STP;
76 writew(s->addr + OMAP_I2C_CON, data);
77 data = readw(s->addr + OMAP_I2C_CON);
78 g_assert((data & OMAP_I2C_CON_STP) != 0);
79
80 data = readw(s->addr + OMAP_I2C_STAT);
81 g_assert((data & OMAP_I2C_STAT_NACK) == 0);
82
83 while (len > 1) {
84 data = readw(s->addr + OMAP_I2C_STAT);
85 g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
86
87 data = buf[0] | ((uint16_t)buf[1] << 8);
88 writew(s->addr + OMAP_I2C_DATA, data);
89 buf = (uint8_t *)buf + 2;
90 len -= 2;
91 }
92 if (len == 1) {
93 data = readw(s->addr + OMAP_I2C_STAT);
94 g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
95
96 data = buf[0];
97 writew(s->addr + OMAP_I2C_DATA, data);
98 }
99
100 data = readw(s->addr + OMAP_I2C_CON);
101 g_assert((data & OMAP_I2C_CON_STP) == 0);
102}
103
104static void omap_i2c_recv(I2CAdapter *i2c, uint8_t addr,
105 uint8_t *buf, uint16_t len)
106{
107 OMAPI2C *s = (OMAPI2C *)i2c;
108 uint16_t data, stat;
109
110 omap_i2c_set_slave_addr(s, addr);
111
112 data = len;
113 writew(s->addr + OMAP_I2C_CNT, data);
114
115 data = OMAP_I2C_CON_I2C_EN |
116 OMAP_I2C_CON_MST |
117 OMAP_I2C_CON_STT |
118 OMAP_I2C_CON_STP;
119 writew(s->addr + OMAP_I2C_CON, data);
120 data = readw(s->addr + OMAP_I2C_CON);
121 g_assert((data & OMAP_I2C_CON_STP) == 0);
122
123 data = readw(s->addr + OMAP_I2C_STAT);
124 g_assert((data & OMAP_I2C_STAT_NACK) == 0);
125
126 data = readw(s->addr + OMAP_I2C_CNT);
127 g_assert_cmpuint(data, ==, len);
128
129 while (len > 0) {
130 data = readw(s->addr + OMAP_I2C_STAT);
131 g_assert((data & OMAP_I2C_STAT_RRDY) != 0);
132 g_assert((data & OMAP_I2C_STAT_ROVR) == 0);
133
134 data = readw(s->addr + OMAP_I2C_DATA);
135
136 stat = readw(s->addr + OMAP_I2C_STAT);
137
138 if (unlikely(len == 1)) {
139 g_assert((stat & OMAP_I2C_STAT_SBD) != 0);
140
141 buf[0] = data & 0xff;
142 buf++;
143 len--;
144 } else {
145 buf[0] = data & 0xff;
146 buf[1] = data >> 8;
147 buf += 2;
148 len -= 2;
149 }
150 }
151
152 data = readw(s->addr + OMAP_I2C_CON);
153 g_assert((data & OMAP_I2C_CON_STP) == 0);
154}
155
156I2CAdapter *omap_i2c_create(uint64_t addr)
157{
158 OMAPI2C *s = g_malloc0(sizeof(*s));
159 I2CAdapter *i2c = (I2CAdapter *)s;
160 uint16_t data;
161
162 s->addr = addr;
163
164 i2c->send = omap_i2c_send;
165 i2c->recv = omap_i2c_recv;
166
167
168 data = readw(addr + OMAP_I2C_REV);
169 g_assert_cmphex(data, ==, 0x34);
170
171 return i2c;
172}
173
