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
11#include "mux.h"
12#include "soc.h"
13#include "i2c.h"
14
15#define OMAP_I2C_SIZE		0x3f
16#define OMAP1_I2C_BASE		0xfffb3800
17
18static const char name[] = "omap_i2c";
19
20static struct resource i2c_resources[2] = {
21};
22
23static struct platform_device omap_i2c_devices[1] = {
24};
25
26static void __init omap1_i2c_mux_pins(int bus_id)
27{
28	omap_cfg_reg(I2C_SDA);
29	omap_cfg_reg(I2C_SCL);
30}
31
32int __init omap_i2c_add_bus(struct omap_i2c_bus_platform_data *pdata,
33				int bus_id)
34{
35	struct platform_device *pdev;
36	struct resource *res;
37
38	if (bus_id > 1)
39		return -EINVAL;
40
41	omap1_i2c_mux_pins(bus_id);
42
43	pdev = &omap_i2c_devices[bus_id - 1];
44	pdev->id = bus_id;
45	pdev->name = name;
46	pdev->num_resources = ARRAY_SIZE(i2c_resources);
47	res = i2c_resources;
48	res[0].start = OMAP1_I2C_BASE;
49	res[0].end = res[0].start + OMAP_I2C_SIZE;
50	res[0].flags = IORESOURCE_MEM;
51	res[1].start = INT_I2C;
52	res[1].flags = IORESOURCE_IRQ;
53	pdev->resource = res;
54
55	/* all OMAP1 have IP version 1 register set */
56	pdata->rev = OMAP_I2C_IP_VERSION_1;
57
58	/* all OMAP1 I2C are implemented like this */
59	pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
60		       OMAP_I2C_FLAG_SIMPLE_CLOCK |
61		       OMAP_I2C_FLAG_16BIT_DATA_REG |
62		       OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
63
64	/* how the cpu bus is wired up differs for 7xx only */
65
66	pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
67
68	pdev->dev.platform_data = pdata;
69
70	return platform_device_register(pdev);
71}
72
73#define OMAP_I2C_MAX_CONTROLLERS 4
74static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
75
76#define OMAP_I2C_CMDLINE_SETUP	(BIT(31))
77
78/**
79 * omap_i2c_bus_setup - Process command line options for the I2C bus speed
80 * @str: String of options
81 *
82 * This function allow to override the default I2C bus speed for given I2C
83 * bus with a command line option.
84 *
85 * Format: i2c_bus=bus_id,clkrate (in kHz)
86 *
87 * Returns 1 on success, 0 otherwise.
88 */
89static int __init omap_i2c_bus_setup(char *str)
90{
91	int ints[3];
92
93	get_options(str, 3, ints);
94	if (ints[0] < 2 || ints[1] < 1 ||
95			ints[1] > OMAP_I2C_MAX_CONTROLLERS)
96		return 0;
97	i2c_pdata[ints[1] - 1].clkrate = ints[2];
98	i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
99
100	return 1;
101}
102__setup("i2c_bus=", omap_i2c_bus_setup);
103
104/*
105 * Register busses defined in command line but that are not registered with
106 * omap_register_i2c_bus from board initialization code.
107 */
108int __init omap_register_i2c_bus_cmdline(void)
109{
110	int i, err = 0;
111
112	for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
113		if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
114			i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
115			err = omap_i2c_add_bus(&i2c_pdata[i], i + 1);
116			if (err)
117				goto out;
118		}
119
120out:
121	return err;
122}
123
124/**
125 * omap_register_i2c_bus - register I2C bus with device descriptors
126 * @bus_id: bus id counting from number 1
127 * @clkrate: clock rate of the bus in kHz
128 * @info: pointer into I2C device descriptor table or NULL
129 * @len: number of descriptors in the table
130 *
131 * Returns 0 on success or an error code.
132 */
133int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
134			  struct i2c_board_info const *info,
135			  unsigned len)
136{
137	int err;
138
139	BUG_ON(bus_id < 1 || bus_id > OMAP_I2C_MAX_CONTROLLERS);
140
141	if (info) {
142		err = i2c_register_board_info(bus_id, info, len);
143		if (err)
144			return err;
145	}
146
147	if (!i2c_pdata[bus_id - 1].clkrate)
148		i2c_pdata[bus_id - 1].clkrate = clkrate;
149
150	i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
151
152	return omap_i2c_add_bus(&i2c_pdata[bus_id - 1], bus_id);
153}
154
155static  int __init omap_i2c_cmdline(void)
156{
157	return omap_register_i2c_bus_cmdline();
158}
159subsys_initcall(omap_i2c_cmdline);
160