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authorMark Brown <broonie@opensource.wolfsonmicro.com>2009-07-27 09:45:56 -0400
committerSamuel Ortiz <sameo@linux.intel.com>2009-09-17 03:46:59 -0400
commit6704e5171ba9053ba173bcd807c7392d2076bdb4 (patch)
tree84f91270bdf1bfbefe2e059dec395d473cbd72d0
parent63aed85e3535b4603798184cc941e49de386d354 (diff)
mfd: Add basic WM831x OTP support
The WM831x series of devices use OTP (One Time Programmable, a type of PROM) to store system configuration. At run time this data is visible via registers. Currently the only explicitly supported feature is that the unique ID provided by every WM831x device is exported to user space via sysfs. Other configuration data may be read by system-specific code in the pre_init() and post_init() platform data operations. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat
-rw-r--r--drivers/mfd/wm831x-core.c4
-rw-r--r--drivers/mfd/wm831x-otp.c83
-rw-r--r--include/linux/mfd/wm831x/otp.h162
3 files changed, 249 insertions, 0 deletions
diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index bc40ea315cc0..33eaea2f988e 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -23,6 +23,7 @@
23#include <linux/mfd/wm831x/pdata.h> 23#include <linux/mfd/wm831x/pdata.h>
24#include <linux/mfd/wm831x/irq.h> 24#include <linux/mfd/wm831x/irq.h>
25#include <linux/mfd/wm831x/auxadc.h> 25#include <linux/mfd/wm831x/auxadc.h>
26#include <linux/mfd/wm831x/otp.h>
26 27
27enum wm831x_parent { 28enum wm831x_parent {
28 WM8310 = 0, 29 WM8310 = 0,
@@ -1340,6 +1341,8 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
1340 ret); 1341 ret);
1341 } 1342 }
1342 1343
1344 wm831x_otp_init(wm831x);
1345
1343 if (pdata && pdata->post_init) { 1346 if (pdata && pdata->post_init) {
1344 ret = pdata->post_init(wm831x); 1347 ret = pdata->post_init(wm831x);
1345 if (ret != 0) { 1348 if (ret != 0) {
@@ -1360,6 +1363,7 @@ err:
1360 1363
1361static void wm831x_device_exit(struct wm831x *wm831x) 1364static void wm831x_device_exit(struct wm831x *wm831x)
1362{ 1365{
1366 wm831x_otp_exit(wm831x);
1363 mfd_remove_devices(wm831x->dev); 1367 mfd_remove_devices(wm831x->dev);
1364 wm831x_irq_exit(wm831x); 1368 wm831x_irq_exit(wm831x);
1365 kfree(wm831x); 1369 kfree(wm831x);
diff --git a/drivers/mfd/wm831x-otp.c b/drivers/mfd/wm831x-otp.c
new file mode 100644
index 000000000000..f742745ff354
--- /dev/null
+++ b/drivers/mfd/wm831x-otp.c
@@ -0,0 +1,83 @@
1/*
2 * wm831x-otp.c -- OTP for Wolfson WM831x PMICs
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/i2c.h>
18#include <linux/bcd.h>
19#include <linux/delay.h>
20#include <linux/mfd/core.h>
21
22#include <linux/mfd/wm831x/core.h>
23#include <linux/mfd/wm831x/otp.h>
24
25/* In bytes */
26#define WM831X_UNIQUE_ID_LEN 16
27
28/* Read the unique ID from the chip into id */
29static int wm831x_unique_id_read(struct wm831x *wm831x, char *id)
30{
31 int i, val;
32
33 for (i = 0; i < WM831X_UNIQUE_ID_LEN / 2; i++) {
34 val = wm831x_reg_read(wm831x, WM831X_UNIQUE_ID_1 + i);
35 if (val < 0)
36 return val;
37
38 id[i * 2] = (val >> 8) & 0xff;
39 id[(i * 2) + 1] = val & 0xff;
40 }
41
42 return 0;
43}
44
45static ssize_t wm831x_unique_id_show(struct device *dev,
46 struct device_attribute *attr, char *buf)
47{
48 struct wm831x *wm831x = dev_get_drvdata(dev);
49 int i, rval;
50 char id[WM831X_UNIQUE_ID_LEN];
51 ssize_t ret = 0;
52
53 rval = wm831x_unique_id_read(wm831x, id);
54 if (rval < 0)
55 return 0;
56
57 for (i = 0; i < WM831X_UNIQUE_ID_LEN; i++)
58 ret += sprintf(&buf[ret], "%02x", buf[i]);
59
60 ret += sprintf(&buf[ret], "\n");
61
62 return ret;
63}
64
65static DEVICE_ATTR(unique_id, 0444, wm831x_unique_id_show, NULL);
66
67int wm831x_otp_init(struct wm831x *wm831x)
68{
69 int ret;
70
71 ret = device_create_file(wm831x->dev, &dev_attr_unique_id);
72 if (ret != 0)
73 dev_err(wm831x->dev, "Unique ID attribute not created: %d\n",
74 ret);
75
76 return ret;
77}
78
79void wm831x_otp_exit(struct wm831x *wm831x)
80{
81 device_remove_file(wm831x->dev, &dev_attr_unique_id);
82}
83
diff --git a/include/linux/mfd/wm831x/otp.h b/include/linux/mfd/wm831x/otp.h
new file mode 100644
index 000000000000..ce1f81a39bfc
--- /dev/null
+++ b/include/linux/mfd/wm831x/otp.h
@@ -0,0 +1,162 @@
1/*
2 * include/linux/mfd/wm831x/otp.h -- OTP interface for WM831x
3 *
4 * Copyright 2009 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#ifndef __MFD_WM831X_OTP_H__
16#define __MFD_WM831X_OTP_H__
17
18int wm831x_otp_init(struct wm831x *wm831x);
19void wm831x_otp_exit(struct wm831x *wm831x);
20
21/*
22 * R30720 (0x7800) - Unique ID 1
23 */
24#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
25#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
26#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
27
28/*
29 * R30721 (0x7801) - Unique ID 2
30 */
31#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
32#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
33#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
34
35/*
36 * R30722 (0x7802) - Unique ID 3
37 */
38#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
39#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
40#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
41
42/*
43 * R30723 (0x7803) - Unique ID 4
44 */
45#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
46#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
47#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
48
49/*
50 * R30724 (0x7804) - Unique ID 5
51 */
52#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
53#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
54#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
55
56/*
57 * R30725 (0x7805) - Unique ID 6
58 */
59#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
60#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
61#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
62
63/*
64 * R30726 (0x7806) - Unique ID 7
65 */
66#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
67#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
68#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
69
70/*
71 * R30727 (0x7807) - Unique ID 8
72 */
73#define WM831X_UNIQUE_ID_MASK 0xFFFF /* UNIQUE_ID - [15:0] */
74#define WM831X_UNIQUE_ID_SHIFT 0 /* UNIQUE_ID - [15:0] */
75#define WM831X_UNIQUE_ID_WIDTH 16 /* UNIQUE_ID - [15:0] */
76
77/*
78 * R30728 (0x7808) - Factory OTP ID
79 */
80#define WM831X_OTP_FACT_ID_MASK 0xFFFE /* OTP_FACT_ID - [15:1] */
81#define WM831X_OTP_FACT_ID_SHIFT 1 /* OTP_FACT_ID - [15:1] */
82#define WM831X_OTP_FACT_ID_WIDTH 15 /* OTP_FACT_ID - [15:1] */
83#define WM831X_OTP_FACT_FINAL 0x0001 /* OTP_FACT_FINAL */
84#define WM831X_OTP_FACT_FINAL_MASK 0x0001 /* OTP_FACT_FINAL */
85#define WM831X_OTP_FACT_FINAL_SHIFT 0 /* OTP_FACT_FINAL */
86#define WM831X_OTP_FACT_FINAL_WIDTH 1 /* OTP_FACT_FINAL */
87
88/*
89 * R30729 (0x7809) - Factory OTP 1
90 */
91#define WM831X_DC3_TRIM_MASK 0xF000 /* DC3_TRIM - [15:12] */
92#define WM831X_DC3_TRIM_SHIFT 12 /* DC3_TRIM - [15:12] */
93#define WM831X_DC3_TRIM_WIDTH 4 /* DC3_TRIM - [15:12] */
94#define WM831X_DC2_TRIM_MASK 0x0FC0 /* DC2_TRIM - [11:6] */
95#define WM831X_DC2_TRIM_SHIFT 6 /* DC2_TRIM - [11:6] */
96#define WM831X_DC2_TRIM_WIDTH 6 /* DC2_TRIM - [11:6] */
97#define WM831X_DC1_TRIM_MASK 0x003F /* DC1_TRIM - [5:0] */
98#define WM831X_DC1_TRIM_SHIFT 0 /* DC1_TRIM - [5:0] */
99#define WM831X_DC1_TRIM_WIDTH 6 /* DC1_TRIM - [5:0] */
100
101/*
102 * R30730 (0x780A) - Factory OTP 2
103 */
104#define WM831X_CHIP_ID_MASK 0xFFFF /* CHIP_ID - [15:0] */
105#define WM831X_CHIP_ID_SHIFT 0 /* CHIP_ID - [15:0] */
106#define WM831X_CHIP_ID_WIDTH 16 /* CHIP_ID - [15:0] */
107
108/*
109 * R30731 (0x780B) - Factory OTP 3
110 */
111#define WM831X_OSC_TRIM_MASK 0x0780 /* OSC_TRIM - [10:7] */
112#define WM831X_OSC_TRIM_SHIFT 7 /* OSC_TRIM - [10:7] */
113#define WM831X_OSC_TRIM_WIDTH 4 /* OSC_TRIM - [10:7] */
114#define WM831X_BG_TRIM_MASK 0x0078 /* BG_TRIM - [6:3] */
115#define WM831X_BG_TRIM_SHIFT 3 /* BG_TRIM - [6:3] */
116#define WM831X_BG_TRIM_WIDTH 4 /* BG_TRIM - [6:3] */
117#define WM831X_LPBG_TRIM_MASK 0x0007 /* LPBG_TRIM - [2:0] */
118#define WM831X_LPBG_TRIM_SHIFT 0 /* LPBG_TRIM - [2:0] */
119#define WM831X_LPBG_TRIM_WIDTH 3 /* LPBG_TRIM - [2:0] */
120
121/*
122 * R30732 (0x780C) - Factory OTP 4
123 */
124#define WM831X_CHILD_I2C_ADDR_MASK 0x00FE /* CHILD_I2C_ADDR - [7:1] */
125#define WM831X_CHILD_I2C_ADDR_SHIFT 1 /* CHILD_I2C_ADDR - [7:1] */
126#define WM831X_CHILD_I2C_ADDR_WIDTH 7 /* CHILD_I2C_ADDR - [7:1] */
127#define WM831X_CH_AW 0x0001 /* CH_AW */
128#define WM831X_CH_AW_MASK 0x0001 /* CH_AW */
129#define WM831X_CH_AW_SHIFT 0 /* CH_AW */
130#define WM831X_CH_AW_WIDTH 1 /* CH_AW */
131
132/*
133 * R30733 (0x780D) - Factory OTP 5
134 */
135#define WM831X_CHARGE_TRIM_MASK 0x003F /* CHARGE_TRIM - [5:0] */
136#define WM831X_CHARGE_TRIM_SHIFT 0 /* CHARGE_TRIM - [5:0] */
137#define WM831X_CHARGE_TRIM_WIDTH 6 /* CHARGE_TRIM - [5:0] */
138
139/*
140 * R30736 (0x7810) - Customer OTP ID
141 */
142#define WM831X_OTP_AUTO_PROG 0x8000 /* OTP_AUTO_PROG */
143#define WM831X_OTP_AUTO_PROG_MASK 0x8000 /* OTP_AUTO_PROG */
144#define WM831X_OTP_AUTO_PROG_SHIFT 15 /* OTP_AUTO_PROG */
145#define WM831X_OTP_AUTO_PROG_WIDTH 1 /* OTP_AUTO_PROG */
146#define WM831X_OTP_CUST_ID_MASK 0x7FFE /* OTP_CUST_ID - [14:1] */
147#define WM831X_OTP_CUST_ID_SHIFT 1 /* OTP_CUST_ID - [14:1] */
148#define WM831X_OTP_CUST_ID_WIDTH 14 /* OTP_CUST_ID - [14:1] */
149#define WM831X_OTP_CUST_FINAL 0x0001 /* OTP_CUST_FINAL */
150#define WM831X_OTP_CUST_FINAL_MASK 0x0001 /* OTP_CUST_FINAL */
151#define WM831X_OTP_CUST_FINAL_SHIFT 0 /* OTP_CUST_FINAL */
152#define WM831X_OTP_CUST_FINAL_WIDTH 1 /* OTP_CUST_FINAL */
153
154/*
155 * R30759 (0x7827) - DBE CHECK DATA
156 */
157#define WM831X_DBE_VALID_DATA_MASK 0xFFFF /* DBE_VALID_DATA - [15:0] */
158#define WM831X_DBE_VALID_DATA_SHIFT 0 /* DBE_VALID_DATA - [15:0] */
159#define WM831X_DBE_VALID_DATA_WIDTH 16 /* DBE_VALID_DATA - [15:0] */
160
161
162#endif
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