ppc/pnv: Add support for POWER8+ LPC Controller
[qemu.git] / tests / libqos / i2c-omap.c
1 /*
2 * QTest I2C driver
3 *
4 * Copyright (c) 2012 Andreas Färber
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
8 */
9 #include "qemu/osdep.h"
10 #include "libqos/i2c.h"
11
12
13 #include "qemu/bswap.h"
14 #include "libqtest.h"
15
16 enum OMAPI2CRegisters {
17 OMAP_I2C_REV = 0x00,
18 OMAP_I2C_STAT = 0x08,
19 OMAP_I2C_CNT = 0x18,
20 OMAP_I2C_DATA = 0x1c,
21 OMAP_I2C_CON = 0x24,
22 OMAP_I2C_SA = 0x2c,
23 };
24
25 enum OMAPI2CSTATBits {
26 OMAP_I2C_STAT_NACK = 1 << 1,
27 OMAP_I2C_STAT_ARDY = 1 << 2,
28 OMAP_I2C_STAT_RRDY = 1 << 3,
29 OMAP_I2C_STAT_XRDY = 1 << 4,
30 OMAP_I2C_STAT_ROVR = 1 << 11,
31 OMAP_I2C_STAT_SBD = 1 << 15,
32 };
33
34 enum OMAPI2CCONBits {
35 OMAP_I2C_CON_STT = 1 << 0,
36 OMAP_I2C_CON_STP = 1 << 1,
37 OMAP_I2C_CON_TRX = 1 << 9,
38 OMAP_I2C_CON_MST = 1 << 10,
39 OMAP_I2C_CON_BE = 1 << 14,
40 OMAP_I2C_CON_I2C_EN = 1 << 15,
41 };
42
43 typedef struct OMAPI2C {
44 I2CAdapter parent;
45
46 uint64_t addr;
47 } OMAPI2C;
48
49
50 static void omap_i2c_set_slave_addr(OMAPI2C *s, uint8_t addr)
51 {
52 uint16_t data = addr;
53
54 writew(s->addr + OMAP_I2C_SA, data);
55 data = readw(s->addr + OMAP_I2C_SA);
56 g_assert_cmphex(data, ==, addr);
57 }
58
59 static void omap_i2c_send(I2CAdapter *i2c, uint8_t addr,
60 const uint8_t *buf, uint16_t len)
61 {
62 OMAPI2C *s = (OMAPI2C *)i2c;
63 uint16_t data;
64
65 omap_i2c_set_slave_addr(s, addr);
66
67 data = len;
68 writew(s->addr + OMAP_I2C_CNT, data);
69
70 data = OMAP_I2C_CON_I2C_EN |
71 OMAP_I2C_CON_TRX |
72 OMAP_I2C_CON_MST |
73 OMAP_I2C_CON_STT |
74 OMAP_I2C_CON_STP;
75 writew(s->addr + OMAP_I2C_CON, data);
76 data = readw(s->addr + OMAP_I2C_CON);
77 g_assert((data & OMAP_I2C_CON_STP) != 0);
78
79 data = readw(s->addr + OMAP_I2C_STAT);
80 g_assert((data & OMAP_I2C_STAT_NACK) == 0);
81
82 while (len > 1) {
83 data = readw(s->addr + OMAP_I2C_STAT);
84 g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
85
86 data = buf[0] | ((uint16_t)buf[1] << 8);
87 writew(s->addr + OMAP_I2C_DATA, data);
88 buf = (uint8_t *)buf + 2;
89 len -= 2;
90 }
91 if (len == 1) {
92 data = readw(s->addr + OMAP_I2C_STAT);
93 g_assert((data & OMAP_I2C_STAT_XRDY) != 0);
94
95 data = buf[0];
96 writew(s->addr + OMAP_I2C_DATA, data);
97 }
98
99 data = readw(s->addr + OMAP_I2C_CON);
100 g_assert((data & OMAP_I2C_CON_STP) == 0);
101 }
102
103 static void omap_i2c_recv(I2CAdapter *i2c, uint8_t addr,
104 uint8_t *buf, uint16_t len)
105 {
106 OMAPI2C *s = (OMAPI2C *)i2c;
107 uint16_t data, stat;
108
109 omap_i2c_set_slave_addr(s, addr);
110
111 data = len;
112 writew(s->addr + OMAP_I2C_CNT, data);
113
114 data = OMAP_I2C_CON_I2C_EN |
115 OMAP_I2C_CON_MST |
116 OMAP_I2C_CON_STT |
117 OMAP_I2C_CON_STP;
118 writew(s->addr + OMAP_I2C_CON, data);
119 data = readw(s->addr + OMAP_I2C_CON);
120 g_assert((data & OMAP_I2C_CON_STP) == 0);
121
122 data = readw(s->addr + OMAP_I2C_STAT);
123 g_assert((data & OMAP_I2C_STAT_NACK) == 0);
124
125 data = readw(s->addr + OMAP_I2C_CNT);
126 g_assert_cmpuint(data, ==, len);
127
128 while (len > 0) {
129 data = readw(s->addr + OMAP_I2C_STAT);
130 g_assert((data & OMAP_I2C_STAT_RRDY) != 0);
131 g_assert((data & OMAP_I2C_STAT_ROVR) == 0);
132
133 data = readw(s->addr + OMAP_I2C_DATA);
134
135 stat = readw(s->addr + OMAP_I2C_STAT);
136
137 if (unlikely(len == 1)) {
138 g_assert((stat & OMAP_I2C_STAT_SBD) != 0);
139
140 buf[0] = data & 0xff;
141 buf++;
142 len--;
143 } else {
144 buf[0] = data & 0xff;
145 buf[1] = data >> 8;
146 buf += 2;
147 len -= 2;
148 }
149 }
150
151 data = readw(s->addr + OMAP_I2C_CON);
152 g_assert((data & OMAP_I2C_CON_STP) == 0);
153 }
154
155 I2CAdapter *omap_i2c_create(uint64_t addr)
156 {
157 OMAPI2C *s = g_malloc0(sizeof(*s));
158 I2CAdapter *i2c = (I2CAdapter *)s;
159 uint16_t data;
160
161 s->addr = addr;
162
163 i2c->send = omap_i2c_send;
164 i2c->recv = omap_i2c_recv;
165
166 /* verify the mmio address by looking for a known signature */
167 data = readw(addr + OMAP_I2C_REV);
168 g_assert_cmphex(data, ==, 0x34);
169
170 return i2c;
171 }