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i2c.c
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1 /*
2  * arch/arm/mach-u300/i2c.c
3  *
4  * Copyright (C) 2009-2012 ST-Ericsson AB
5  * License terms: GNU General Public License (GPL) version 2
6  *
7  * Register board i2c devices
8  * Author: Linus Walleij <[email protected]>
9  */
10 #include <linux/kernel.h>
11 #include <linux/i2c.h>
12 #include <linux/mfd/ab3100.h>
13 #include <linux/regulator/machine.h>
14 #include <linux/amba/bus.h>
15 #include <mach/irqs.h>
16 
17 /*
18  * Initial settings of ab3100 registers.
19  * Common for below LDO regulator settings are that
20  * bit 7-5 controls voltage. Bit 4 turns regulator ON(1) or OFF(0).
21  * Bit 3-2 controls sleep enable and bit 1-0 controls sleep mode.
22  */
23 
24 /* LDO_A 0x16: 2.75V, ON, SLEEP_A, SLEEP OFF GND */
25 #define LDO_A_SETTING 0x16
26 /* LDO_C 0x10: 2.65V, ON, SLEEP_A or B, SLEEP full power */
27 #define LDO_C_SETTING 0x10
28 /* LDO_D 0x10: 2.65V, ON, sleep mode not used */
29 #define LDO_D_SETTING 0x10
30 /* LDO_E 0x10: 1.8V, ON, SLEEP_A or B, SLEEP full power */
31 #define LDO_E_SETTING 0x10
32 /* LDO_E SLEEP 0x00: 1.8V, not used, SLEEP_A or B, not used */
33 #define LDO_E_SLEEP_SETTING 0x00
34 /* LDO_F 0xD0: 2.5V, ON, SLEEP_A or B, SLEEP full power */
35 #define LDO_F_SETTING 0xD0
36 /* LDO_G 0x00: 2.85V, OFF, SLEEP_A or B, SLEEP full power */
37 #define LDO_G_SETTING 0x00
38 /* LDO_H 0x18: 2.75V, ON, SLEEP_B, SLEEP full power */
39 #define LDO_H_SETTING 0x18
40 /* LDO_K 0x00: 2.75V, OFF, SLEEP_A or B, SLEEP full power */
41 #define LDO_K_SETTING 0x00
42 /* LDO_EXT 0x00: Voltage not set, OFF, not used, not used */
43 #define LDO_EXT_SETTING 0x00
44 /* BUCK 0x7D: 1.2V, ON, SLEEP_A and B, SLEEP low power */
45 #define BUCK_SETTING 0x7D
46 /* BUCK SLEEP 0xAC: 1.05V, Not used, SLEEP_A and B, Not used */
47 #define BUCK_SLEEP_SETTING 0xAC
48 
49 #ifdef CONFIG_AB3100_CORE
50 static struct regulator_consumer_supply supply_ldo_c[] = {
51  {
52  .dev_name = "ab3100-codec",
53  .supply = "vaudio", /* Powers the codec */
54  },
55 };
56 
57 /*
58  * This one needs to be a supply so we can turn it off
59  * in order to shut down the system.
60  */
61 static struct regulator_consumer_supply supply_ldo_d[] = {
62  {
63  .supply = "vana15", /* Powers the SoC (CPU etc) */
64  },
65 };
66 
67 static struct regulator_consumer_supply supply_ldo_g[] = {
68  {
69  .dev_name = "mmci",
70  .supply = "vmmc", /* Powers MMC/SD card */
71  },
72 };
73 
74 static struct regulator_consumer_supply supply_ldo_h[] = {
75  {
76  .dev_name = "xgam_pdi",
77  .supply = "vdisp", /* Powers camera, display etc */
78  },
79 };
80 
81 static struct regulator_consumer_supply supply_ldo_k[] = {
82  {
83  .dev_name = "irda",
84  .supply = "vir", /* Power IrDA */
85  },
86 };
87 
88 /*
89  * This is a placeholder for whoever wish to use the
90  * external power.
91  */
92 static struct regulator_consumer_supply supply_ldo_ext[] = {
93  {
94  .supply = "vext", /* External power */
95  },
96 };
97 
98 /* Preset (hardware defined) voltages for these regulators */
99 #define LDO_A_VOLTAGE 2750000
100 #define LDO_C_VOLTAGE 2650000
101 #define LDO_D_VOLTAGE 2650000
102 
103 static struct ab3100_platform_data ab3100_plf_data = {
104  .reg_constraints = {
105  /* LDO A routing and constraints */
106  {
107  .constraints = {
108  .name = "vrad",
109  .min_uV = LDO_A_VOLTAGE,
110  .max_uV = LDO_A_VOLTAGE,
111  .valid_modes_mask = REGULATOR_MODE_NORMAL,
112  .always_on = 1,
113  .boot_on = 1,
114  },
115  },
116  /* LDO C routing and constraints */
117  {
118  .constraints = {
119  .min_uV = LDO_C_VOLTAGE,
120  .max_uV = LDO_C_VOLTAGE,
121  .valid_modes_mask = REGULATOR_MODE_NORMAL,
122  },
123  .num_consumer_supplies = ARRAY_SIZE(supply_ldo_c),
124  .consumer_supplies = supply_ldo_c,
125  },
126  /* LDO D routing and constraints */
127  {
128  .constraints = {
129  .min_uV = LDO_D_VOLTAGE,
130  .max_uV = LDO_D_VOLTAGE,
131  .valid_modes_mask = REGULATOR_MODE_NORMAL,
132  .valid_ops_mask = REGULATOR_CHANGE_STATUS,
133  /*
134  * Actually this is boot_on but we need
135  * to reference count it externally to
136  * be able to shut down the system.
137  */
138  },
139  .num_consumer_supplies = ARRAY_SIZE(supply_ldo_d),
140  .consumer_supplies = supply_ldo_d,
141  },
142  /* LDO E routing and constraints */
143  {
144  .constraints = {
145  .name = "vio",
146  .min_uV = 1800000,
147  .max_uV = 1800000,
148  .valid_modes_mask = REGULATOR_MODE_NORMAL,
149  .always_on = 1,
150  .boot_on = 1,
151  },
152  },
153  /* LDO F routing and constraints */
154  {
155  .constraints = {
156  .name = "vana25",
157  .min_uV = 2500000,
158  .max_uV = 2500000,
159  .valid_modes_mask = REGULATOR_MODE_NORMAL,
160  .always_on = 1,
161  .boot_on = 1,
162  },
163  },
164  /* LDO G routing and constraints */
165  {
166  .constraints = {
167  .min_uV = 1500000,
168  .max_uV = 2850000,
169  .valid_modes_mask = REGULATOR_MODE_NORMAL,
170  .valid_ops_mask =
171  REGULATOR_CHANGE_VOLTAGE |
172  REGULATOR_CHANGE_STATUS,
173  },
174  .num_consumer_supplies = ARRAY_SIZE(supply_ldo_g),
175  .consumer_supplies = supply_ldo_g,
176  },
177  /* LDO H routing and constraints */
178  {
179  .constraints = {
180  .min_uV = 1200000,
181  .max_uV = 2750000,
182  .valid_modes_mask = REGULATOR_MODE_NORMAL,
183  .valid_ops_mask =
184  REGULATOR_CHANGE_VOLTAGE |
185  REGULATOR_CHANGE_STATUS,
186  },
187  .num_consumer_supplies = ARRAY_SIZE(supply_ldo_h),
188  .consumer_supplies = supply_ldo_h,
189  },
190  /* LDO K routing and constraints */
191  {
192  .constraints = {
193  .min_uV = 1800000,
194  .max_uV = 2750000,
195  .valid_modes_mask = REGULATOR_MODE_NORMAL,
196  .valid_ops_mask =
197  REGULATOR_CHANGE_VOLTAGE |
198  REGULATOR_CHANGE_STATUS,
199  },
200  .num_consumer_supplies = ARRAY_SIZE(supply_ldo_k),
201  .consumer_supplies = supply_ldo_k,
202  },
203  /* External regulator interface. No fixed voltage specified.
204  * If we knew the voltage of the external regulator and it
205  * was connected on the board, we could add the (fixed)
206  * voltage for it here.
207  */
208  {
209  .constraints = {
210  .min_uV = 0,
211  .max_uV = 0,
212  .valid_modes_mask = REGULATOR_MODE_NORMAL,
213  .valid_ops_mask =
214  REGULATOR_CHANGE_STATUS,
215  },
216  .num_consumer_supplies = ARRAY_SIZE(supply_ldo_ext),
217  .consumer_supplies = supply_ldo_ext,
218  },
219  /* Buck converter routing and constraints */
220  {
221  .constraints = {
222  .name = "vcore",
223  .min_uV = 1200000,
224  .max_uV = 1800000,
225  .valid_modes_mask = REGULATOR_MODE_NORMAL,
226  .valid_ops_mask =
227  REGULATOR_CHANGE_VOLTAGE,
228  .always_on = 1,
229  .boot_on = 1,
230  },
231  },
232  },
233  .reg_initvals = {
234  LDO_A_SETTING,
235  LDO_C_SETTING,
236  LDO_E_SETTING,
237  LDO_E_SLEEP_SETTING,
238  LDO_F_SETTING,
239  LDO_G_SETTING,
240  LDO_H_SETTING,
241  LDO_K_SETTING,
242  LDO_EXT_SETTING,
243  BUCK_SETTING,
244  BUCK_SLEEP_SETTING,
245  LDO_D_SETTING,
246  },
247 };
248 #endif
249 
250 static struct i2c_board_info __initdata bus0_i2c_board_info[] = {
251 #ifdef CONFIG_AB3100_CORE
252  {
253  .type = "ab3100",
254  .addr = 0x48,
255  .irq = IRQ_U300_IRQ0_EXT,
256  .platform_data = &ab3100_plf_data,
257  },
258 #else
259  { },
260 #endif
261 };
262 
263 static struct i2c_board_info __initdata bus1_i2c_board_info[] = {
264  {
265  .type = "fwcam",
266  .addr = 0x10,
267  },
268  {
269  .type = "fwcam",
270  .addr = 0x5d,
271  },
272 };
273 
274 void __init u300_i2c_register_board_devices(void)
275 {
276  i2c_register_board_info(0, bus0_i2c_board_info,
277  ARRAY_SIZE(bus0_i2c_board_info));
278  /*
279  * This makes the core shut down all unused regulators
280  * after all the initcalls have completed.
281  */
282  regulator_has_full_constraints();
283  i2c_register_board_info(1, bus1_i2c_board_info,
284  ARRAY_SIZE(bus1_i2c_board_info));
285 }
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