1 /* SPDX-License-Identifier: GPL-2.0-only */
2
3 #include <device/mmio.h>
4 #include <console/console.h>
5 #include <device/i2c_simple.h>
6 #include <gpio.h>
7 #include <soc/grf.h>
8 #include <soc/i2c.h>
9 #include <soc/pmu.h>
10
11 static struct {
12 gpio_t scl;
13 gpio_t sda;
14 } pins[] = {
15 [0]{.scl = GPIO(0, C, 0), .sda = GPIO(0, B, 7)},
16 [1]{.scl = GPIO(8, A, 5), .sda = GPIO(8, A, 4)},
17 [2]{.scl = GPIO(6, B, 2), .sda = GPIO(6, B, 1)},
18 [3]{.scl = GPIO(2, C, 0), .sda = GPIO(2, C, 1)},
19 [4]{.scl = GPIO(7, C, 2), .sda = GPIO(7, C, 1)},
20 [5]{.scl = GPIO(7, C, 4), .sda = GPIO(7, C, 3)},
21 };
22
get_scl(unsigned int bus)23 static int get_scl(unsigned int bus)
24 {
25 return gpio_get(pins[bus].scl);
26 }
27
get_sda(unsigned int bus)28 static int get_sda(unsigned int bus)
29 {
30 return gpio_get(pins[bus].sda);
31 }
32
set_scl(unsigned int bus,int high)33 static void set_scl(unsigned int bus, int high)
34 {
35 if (high)
36 gpio_input_pullup(pins[bus].scl);
37 else
38 gpio_output(pins[bus].scl, 0);
39 }
40
set_sda(unsigned int bus,int high)41 static void set_sda(unsigned int bus, int high)
42 {
43 if (high)
44 gpio_input_pullup(pins[bus].sda);
45 else
46 gpio_output(pins[bus].sda, 0);
47 }
48
49 static struct software_i2c_ops rk_ops = {
50 .get_scl = get_scl,
51 .get_sda = get_sda,
52 .set_scl = set_scl,
53 .set_sda = set_sda,
54 };
55
software_i2c_attach(unsigned int bus)56 void software_i2c_attach(unsigned int bus)
57 {
58 software_i2c[bus] = &rk_ops;
59
60 /* Mux pins to GPIO function for software I2C emulation. */
61 switch (bus) {
62 case 0:
63 clrbits32(&rk3288_pmu->iomux_i2c0scl, IOMUX_I2C0SCL);
64 clrbits32(&rk3288_pmu->iomux_i2c0sda, IOMUX_I2C0SDA);
65 break;
66 case 1:
67 write32(&rk3288_grf->iomux_i2c1, IOMUX_GPIO(IOMUX_I2C1));
68 break;
69 case 2:
70 write32(&rk3288_grf->iomux_i2c2, IOMUX_GPIO(IOMUX_I2C2));
71 break;
72 case 3:
73 write32(&rk3288_grf->iomux_i2c3, IOMUX_GPIO(IOMUX_I2C3));
74 break;
75 case 4:
76 write32(&rk3288_grf->iomux_i2c4, IOMUX_GPIO(IOMUX_I2C4));
77 break;
78 case 5:
79 write32(&rk3288_grf->iomux_i2c5scl, IOMUX_GPIO(IOMUX_I2C5SCL));
80 write32(&rk3288_grf->iomux_i2c5sda, IOMUX_GPIO(IOMUX_I2C5SDA));
81 break;
82 default:
83 die("Unknown I2C bus number!");
84 }
85
86 /* Initialize bus to idle state. */
87 set_scl(bus, 1);
88 set_sda(bus, 1);
89 }
90
software_i2c_detach(unsigned int bus)91 void software_i2c_detach(unsigned int bus)
92 {
93 software_i2c[bus] = NULL;
94
95 /* Mux pins back to hardware I2C controller. */
96 switch (bus) {
97 case 0:
98 setbits32(&rk3288_pmu->iomux_i2c0scl, IOMUX_I2C0SCL);
99 setbits32(&rk3288_pmu->iomux_i2c0sda, IOMUX_I2C0SDA);
100 break;
101 case 1:
102 write32(&rk3288_grf->iomux_i2c1, IOMUX_I2C1);
103 break;
104 case 2:
105 write32(&rk3288_grf->iomux_i2c2, IOMUX_I2C2);
106 break;
107 case 3:
108 write32(&rk3288_grf->iomux_i2c3, IOMUX_I2C3);
109 break;
110 case 4:
111 write32(&rk3288_grf->iomux_i2c4, IOMUX_I2C4);
112 break;
113 case 5:
114 write32(&rk3288_grf->iomux_i2c5scl, IOMUX_I2C5SCL);
115 write32(&rk3288_grf->iomux_i2c5sda, IOMUX_I2C5SDA);
116 break;
117 default:
118 die("Unknown I2C bus number!");
119 }
120 }
121