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1/*
2 * Helper module for board specific I2C bus registration
3 *
4 * Copyright (C) 2009 Nokia Corporation.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22#include <linux/i2c-omap.h>
23#include <mach/mux.h>
24#include "soc.h"
25
26#include <plat/i2c.h>
27
28#define OMAP_I2C_SIZE 0x3f
29#define OMAP1_I2C_BASE 0xfffb3800
30#define OMAP1_INT_I2C (32 + 4)
31
32static const char name[] = "omap_i2c";
33
34static struct resource i2c_resources[2] = {
35};
36
37static struct platform_device omap_i2c_devices[1] = {
38};
39
40static void __init omap1_i2c_mux_pins(int bus_id)
41{
42 if (cpu_is_omap7xx()) {
43 omap_cfg_reg(I2C_7XX_SDA);
44 omap_cfg_reg(I2C_7XX_SCL);
45 } else {
46 omap_cfg_reg(I2C_SDA);
47 omap_cfg_reg(I2C_SCL);
48 }
49}
50
51int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
52 int bus_id)
53{
54 struct platform_device *pdev;
55 struct resource *res;
56
57 if (bus_id > 1)
58 return -EINVAL;
59
60 omap1_i2c_mux_pins(bus_id);
61
62 pdev = &omap_i2c_devices[bus_id - 1];
63 pdev->id = bus_id;
64 pdev->name = name;
65 pdev->num_resources = ARRAY_SIZE(i2c_resources);
66 res = i2c_resources;
67 res[0].start = OMAP1_I2C_BASE;
68 res[0].end = res[0].start + OMAP_I2C_SIZE;
69 res[0].flags = IORESOURCE_MEM;
70 res[1].start = OMAP1_INT_I2C;
71 res[1].flags = IORESOURCE_IRQ;
72 pdev->resource = res;
73
74 /* all OMAP1 have IP version 1 register set */
75 pdata->rev = OMAP_I2C_IP_VERSION_1;
76
77 /* all OMAP1 I2C are implemented like this */
78 pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
79 OMAP_I2C_FLAG_SIMPLE_CLOCK |
80 OMAP_I2C_FLAG_16BIT_DATA_REG |
81 OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
82
83 /* how the cpu bus is wired up differs for 7xx only */
84
85 if (cpu_is_omap7xx())
86 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
87 else
88 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
89
90 pdev->dev.platform_data = pdata;
91
92 return platform_device_register(pdev);
93}
94
95static int __init omap_i2c_cmdline(void)
96{
97 return omap_register_i2c_bus_cmdline();
98}
99subsys_initcall(omap_i2c_cmdline);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Helper module for board specific I2C bus registration
4 *
5 * Copyright (C) 2009 Nokia Corporation.
6 */
7
8#include <linux/i2c.h>
9#include <linux/platform_data/i2c-omap.h>
10#include <mach/mux.h>
11#include "soc.h"
12
13#define OMAP_I2C_SIZE 0x3f
14#define OMAP1_I2C_BASE 0xfffb3800
15
16static const char name[] = "omap_i2c";
17
18static struct resource i2c_resources[2] = {
19};
20
21static struct platform_device omap_i2c_devices[1] = {
22};
23
24static void __init omap1_i2c_mux_pins(int bus_id)
25{
26 if (cpu_is_omap7xx()) {
27 omap_cfg_reg(I2C_7XX_SDA);
28 omap_cfg_reg(I2C_7XX_SCL);
29 } else {
30 omap_cfg_reg(I2C_SDA);
31 omap_cfg_reg(I2C_SCL);
32 }
33}
34
35int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
36 int bus_id)
37{
38 struct platform_device *pdev;
39 struct resource *res;
40
41 if (bus_id > 1)
42 return -EINVAL;
43
44 omap1_i2c_mux_pins(bus_id);
45
46 pdev = &omap_i2c_devices[bus_id - 1];
47 pdev->id = bus_id;
48 pdev->name = name;
49 pdev->num_resources = ARRAY_SIZE(i2c_resources);
50 res = i2c_resources;
51 res[0].start = OMAP1_I2C_BASE;
52 res[0].end = res[0].start + OMAP_I2C_SIZE;
53 res[0].flags = IORESOURCE_MEM;
54 res[1].start = INT_I2C;
55 res[1].flags = IORESOURCE_IRQ;
56 pdev->resource = res;
57
58 /* all OMAP1 have IP version 1 register set */
59 pdata->rev = OMAP_I2C_IP_VERSION_1;
60
61 /* all OMAP1 I2C are implemented like this */
62 pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
63 OMAP_I2C_FLAG_SIMPLE_CLOCK |
64 OMAP_I2C_FLAG_16BIT_DATA_REG |
65 OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
66
67 /* how the cpu bus is wired up differs for 7xx only */
68
69 if (cpu_is_omap7xx())
70 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
71 else
72 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
73
74 pdev->dev.platform_data = pdata;
75
76 return platform_device_register(pdev);
77}
78
79#define OMAP_I2C_MAX_CONTROLLERS 4
80static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
81
82#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
83
84/**
85 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
86 * @str: String of options
87 *
88 * This function allow to override the default I2C bus speed for given I2C
89 * bus with a command line option.
90 *
91 * Format: i2c_bus=bus_id,clkrate (in kHz)
92 *
93 * Returns 1 on success, 0 otherwise.
94 */
95static int __init omap_i2c_bus_setup(char *str)
96{
97 int ints[3];
98
99 get_options(str, 3, ints);
100 if (ints[0] < 2 || ints[1] < 1 ||
101 ints[1] > OMAP_I2C_MAX_CONTROLLERS)
102 return 0;
103 i2c_pdata[ints[1] - 1].clkrate = ints[2];
104 i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
105
106 return 1;
107}
108__setup("i2c_bus=", omap_i2c_bus_setup);
109
110/*
111 * Register busses defined in command line but that are not registered with
112 * omap_register_i2c_bus from board initialization code.
113 */
114int __init omap_register_i2c_bus_cmdline(void)
115{
116 int i, err = 0;
117
118 for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
119 if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
120 i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
121 err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
122 if (err)
123 goto out;
124 }
125
126out:
127 return err;
128}
129
130/**
131 * omap_register_i2c_bus - register I2C bus with device descriptors
132 * @bus_id: bus id counting from number 1
133 * @clkrate: clock rate of the bus in kHz
134 * @info: pointer into I2C device descriptor table or NULL
135 * @len: number of descriptors in the table
136 *
137 * Returns 0 on success or an error code.
138 */
139int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
140 struct i2c_board_info const *info,
141 unsigned len)
142{
143 int err;
144
145 BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);
146
147 if (info) {
148 err = i2c_register_board_info(bus_id, info, len);
149 if (err)
150 return err;
151 }
152
153 if (!i2c_pdata[bus_id - 1].clkrate)
154 i2c_pdata[bus_id - 1].clkrate = clkrate;
155
156 i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
157
158 return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
159}
160
161static int __init omap_i2c_cmdline(void)
162{
163 return omap_register_i2c_bus_cmdline();
164}
165subsys_initcall(omap_i2c_cmdline);