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26#include <linux/kernel.h>
27#include <linux/platform_device.h>
28#include <linux/i2c.h>
29#include <linux/i2c-omap.h>
30#include <linux/slab.h>
31#include <linux/err.h>
32#include <linux/clk.h>
33
34#include <mach/irqs.h>
35#include <plat/i2c.h>
36#include <plat/omap-pm.h>
37#include <plat/omap_device.h>
38
39#define OMAP_I2C_SIZE 0x3f
40#define OMAP1_I2C_BASE 0xfffb3800
41#define OMAP1_INT_I2C (32 + 4)
42
43static const char name[] = "omap_i2c";
44
45#define I2C_RESOURCE_BUILDER(base, irq) \
46 { \
47 .start = (base), \
48 .end = (base) + OMAP_I2C_SIZE, \
49 .flags = IORESOURCE_MEM, \
50 }, \
51 { \
52 .start = (irq), \
53 .flags = IORESOURCE_IRQ, \
54 },
55
56static struct resource i2c_resources[][2] = {
57 { I2C_RESOURCE_BUILDER(0, 0) },
58};
59
60#define I2C_DEV_BUILDER(bus_id, res, data) \
61 { \
62 .id = (bus_id), \
63 .name = name, \
64 .num_resources = ARRAY_SIZE(res), \
65 .resource = (res), \
66 .dev = { \
67 .platform_data = (data), \
68 }, \
69 }
70
71#define MAX_OMAP_I2C_HWMOD_NAME_LEN 16
72#define OMAP_I2C_MAX_CONTROLLERS 4
73static struct omap_i2c_bus_platform_data i2c_pdata[OMAP_I2C_MAX_CONTROLLERS];
74static struct platform_device omap_i2c_devices[] = {
75 I2C_DEV_BUILDER(1, i2c_resources[0], &i2c_pdata[0]),
76};
77
78#define OMAP_I2C_CMDLINE_SETUP (BIT(31))
79
80static int __init omap_i2c_nr_ports(void)
81{
82 int ports = 0;
83
84 if (cpu_class_is_omap1())
85 ports = 1;
86 else if (cpu_is_omap24xx())
87 ports = 2;
88 else if (cpu_is_omap34xx())
89 ports = 3;
90 else if (cpu_is_omap44xx())
91 ports = 4;
92
93 return ports;
94}
95
96static inline int omap1_i2c_add_bus(int bus_id)
97{
98 struct platform_device *pdev;
99 struct omap_i2c_bus_platform_data *pdata;
100 struct resource *res;
101
102 omap1_i2c_mux_pins(bus_id);
103
104 pdev = &omap_i2c_devices[bus_id - 1];
105 res = pdev->resource;
106 res[0].start = OMAP1_I2C_BASE;
107 res[0].end = res[0].start + OMAP_I2C_SIZE;
108 res[1].start = OMAP1_INT_I2C;
109 pdata = &i2c_pdata[bus_id - 1];
110
111
112 pdata->rev = OMAP_I2C_IP_VERSION_1;
113
114
115 pdata->flags = OMAP_I2C_FLAG_NO_FIFO |
116 OMAP_I2C_FLAG_SIMPLE_CLOCK |
117 OMAP_I2C_FLAG_16BIT_DATA_REG |
118 OMAP_I2C_FLAG_ALWAYS_ARMXOR_CLK;
119
120
121
122 if (cpu_is_omap7xx())
123 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_1;
124 else
125 pdata->flags |= OMAP_I2C_FLAG_BUS_SHIFT_2;
126
127 return platform_device_register(pdev);
128}
129
130
131#ifdef CONFIG_ARCH_OMAP2PLUS
132
133
134
135
136
137static void omap_pm_set_max_mpu_wakeup_lat_compat(struct device *dev, long t)
138{
139 omap_pm_set_max_mpu_wakeup_lat(dev, t);
140}
141
142static inline int omap2_i2c_add_bus(int bus_id)
143{
144 int l;
145 struct omap_hwmod *oh;
146 struct platform_device *pdev;
147 char oh_name[MAX_OMAP_I2C_HWMOD_NAME_LEN];
148 struct omap_i2c_bus_platform_data *pdata;
149 struct omap_i2c_dev_attr *dev_attr;
150
151 omap2_i2c_mux_pins(bus_id);
152
153 l = snprintf(oh_name, MAX_OMAP_I2C_HWMOD_NAME_LEN, "i2c%d", bus_id);
154 WARN(l >= MAX_OMAP_I2C_HWMOD_NAME_LEN,
155 "String buffer overflow in I2C%d device setup\n", bus_id);
156 oh = omap_hwmod_lookup(oh_name);
157 if (!oh) {
158 pr_err("Could not look up %s\n", oh_name);
159 return -EEXIST;
160 }
161
162 pdata = &i2c_pdata[bus_id - 1];
163
164
165
166
167
168 pdata->rev = oh->class->rev;
169
170 dev_attr = (struct omap_i2c_dev_attr *)oh->dev_attr;
171 pdata->flags = dev_attr->flags;
172
173
174
175
176
177
178
179
180 if (cpu_is_omap34xx())
181 pdata->set_mpu_wkup_lat = omap_pm_set_max_mpu_wakeup_lat_compat;
182 pdev = omap_device_build(name, bus_id, oh, pdata,
183 sizeof(struct omap_i2c_bus_platform_data),
184 NULL, 0, 0);
185 WARN(IS_ERR(pdev), "Could not build omap_device for %s\n", name);
186
187 return PTR_RET(pdev);
188}
189#else
190static inline int omap2_i2c_add_bus(int bus_id)
191{
192 return 0;
193}
194#endif
195
196static int __init omap_i2c_add_bus(int bus_id)
197{
198 if (cpu_class_is_omap1())
199 return omap1_i2c_add_bus(bus_id);
200 else
201 return omap2_i2c_add_bus(bus_id);
202}
203
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213
214
215static int __init omap_i2c_bus_setup(char *str)
216{
217 int ports;
218 int ints[3];
219
220 ports = omap_i2c_nr_ports();
221 get_options(str, 3, ints);
222 if (ints[0] < 2 || ints[1] < 1 || ints[1] > ports)
223 return 0;
224 i2c_pdata[ints[1] - 1].clkrate = ints[2];
225 i2c_pdata[ints[1] - 1].clkrate |= OMAP_I2C_CMDLINE_SETUP;
226
227 return 1;
228}
229__setup("i2c_bus=", omap_i2c_bus_setup);
230
231
232
233
234
235static int __init omap_register_i2c_bus_cmdline(void)
236{
237 int i, err = 0;
238
239 for (i = 0; i < ARRAY_SIZE(i2c_pdata); i++)
240 if (i2c_pdata[i].clkrate & OMAP_I2C_CMDLINE_SETUP) {
241 i2c_pdata[i].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
242 err = omap_i2c_add_bus(i + 1);
243 if (err)
244 goto out;
245 }
246
247out:
248 return err;
249}
250subsys_initcall(omap_register_i2c_bus_cmdline);
251
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259
260
261int __init omap_register_i2c_bus(int bus_id, u32 clkrate,
262 struct i2c_board_info const *info,
263 unsigned len)
264{
265 int err;
266
267 BUG_ON(bus_id < 1 || bus_id > omap_i2c_nr_ports());
268
269 if (info) {
270 err = i2c_register_board_info(bus_id, info, len);
271 if (err)
272 return err;
273 }
274
275 if (!i2c_pdata[bus_id - 1].clkrate)
276 i2c_pdata[bus_id - 1].clkrate = clkrate;
277
278 i2c_pdata[bus_id - 1].clkrate &= ~OMAP_I2C_CMDLINE_SETUP;
279
280 return omap_i2c_add_bus(bus_id);
281}
282