Freescale Semiconductor I.MX 6SoloLite Linux Manuale utente

i.MX 6SoloLite Linux Reference

Manual

Document Number: IMXL6SLRM

Rev L3.0.35_4.1.0, 09/2013

i.MX 6SoloLite Linux Reference Manual, Rev. L3.0.35_4.1.0, 09/2013

2 Freescale Semiconductor, Inc.

Contents

Section number Title Page

Chapter 1

About This Book

1.1 Audience.........................................................................................................................................................................17

1.1.1 Conventions.......................................................................................................................................................17

1.1.2 Definitions, Acronyms, and Abbreviations........................................................................................................17

Chapter 2

Introduction

2.1 Overview.........................................................................................................................................................................21

2.1.1 Software Base....................................................................................................................................................21

2.1.2 Features..............................................................................................................................................................22

Chapter 3

Machine Specific Layer (MSL)

3.1 Introduction.....................................................................................................................................................................27

3.2 Interrupts (Operation).....................................................................................................................................................28

3.2.1 Interrupt Hardware Operation............................................................................................................................28

3.2.2 Interrupt Software Operation.............................................................................................................................28

3.2.3 Interrupt Features...............................................................................................................................................29

3.2.4 Interrupt Source Code Structure........................................................................................................................29

3.2.5 Interrupt Programming Interface.......................................................................................................................29

3.3 Timer...............................................................................................................................................................................30

3.3.1 Timer Software Operation.................................................................................................................................30

3.3.2 Timer Features...................................................................................................................................................30

3.3.3 Timer Source Code Structure.............................................................................................................................31

3.3.4 Timer Programming Interface............................................................................................................................31

3.4 Memory Map..................................................................................................................................................................31

3.4.1 Memory Map Hardware Operation....................................................................................................................31

3.4.2 Memory Map Software Operation.....................................................................................................................31

3.4.3 Memory Map Features.......................................................................................................................................31

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3.4.4 Memory Map Source Code Structure................................................................................................................32

3.4.5 Memory Map Programming Interface...............................................................................................................32

3.5 IOMUX...........................................................................................................................................................................32

3.5.1 IOMUX Hardware Operation............................................................................................................................33

3.5.2 IOMUX Software Operation..............................................................................................................................33

3.5.3 IOMUX Features................................................................................................................................................34

3.5.4 IOMUX Source Code Structure.........................................................................................................................34

3.5.5 IOMUX Programming Interface........................................................................................................................34

3.5.6 IOMUX Control Through GPIO Module..........................................................................................................34

3.5.6.1 GPIO Hardware Operation.................................................................................................................35

3.5.6.1.1 Muxing Control.................................................................................................................35

3.5.6.1.2 PULLUP Control..............................................................................................................35

3.5.6.2 GPIO Software Operation (general)..................................................................................................35

3.5.6.3 GPIO Implementation........................................................................................................................35

3.5.6.4 GPIO Source Code Structure.............................................................................................................36

3.5.6.5 GPIO Programming Interface............................................................................................................36

3.6 General Purpose Input/Output(GPIO)............................................................................................................................36

3.6.1 GPIO Software Operation..................................................................................................................................36

3.6.1.1 API for GPIO.....................................................................................................................................37

3.6.2 GPIO Features....................................................................................................................................................37

3.6.3 GPIO Module Source Code Structure................................................................................................................37

3.6.4 GPIO Programming Interface 2.........................................................................................................................38

Chapter 4

Smart Direct Memory Access (SDMA) API

4.1 Overview.........................................................................................................................................................................39

4.1.1 Hardware Operation...........................................................................................................................................39

4.1.2 Software Operation............................................................................................................................................39

4.1.3 Source Code Structure.......................................................................................................................................40

4.1.4 Menu Configuration Options.............................................................................................................................41

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4.1.5 Programming Interface......................................................................................................................................41

4.1.6 Usage Example..................................................................................................................................................41

Chapter 5

Electrophoretic Display Controller (EPDC) Frame Buffer Driver

5.1 Introduction.....................................................................................................................................................................43

5.2 Hardware Operation........................................................................................................................................................44

5.3 Software Operation.........................................................................................................................................................44

5.3.1 EPDC Frame Buffer Driver Overview...............................................................................................................44

5.3.2 EPDC Frame Buffer Driver Extensions.............................................................................................................45

5.3.3 EPDC Panel Configuration................................................................................................................................45

5.3.3.1 Boot Command Line Parameters.......................................................................................................46

5.3.4 EPDC Waveform Loading.................................................................................................................................47

5.3.4.1 Using a Default Waveform File.........................................................................................................47

5.3.4.2 Using a Custom Waveform File.........................................................................................................48

5.3.5 EPDC Panel Initialization..................................................................................................................................48

5.3.6 Grayscale Framebuffer Selection.......................................................................................................................49

5.3.7 Enabling An EPDC Splash Screen.....................................................................................................................49

5.4 Source Code Structure ...................................................................................................................................................50

5.5 Menu Configuration Options..........................................................................................................................................51

5.6 Programming Interface...................................................................................................................................................51

5.6.1 IOCTLs/Functions.............................................................................................................................................52

5.6.2 Structures and Defines.......................................................................................................................................55

Chapter 6

Sipix Display Controller (SPDC) Frame Buffer Driver

6.1 Introduction.....................................................................................................................................................................57

6.2 Hardware Operation........................................................................................................................................................58

6.3 Software Operation.........................................................................................................................................................58

6.3.1 SPDC Frame Buffer Driver Overview...............................................................................................................58

6.3.2 SPDC Frame Buffer Driver Extensions.............................................................................................................59

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6.3.3 SPDC Panel Configuration................................................................................................................................59

6.3.3.1 Boot Command Line Parameters.......................................................................................................60

6.3.4 SPDC Waveform Loading.................................................................................................................................60

6.3.4.1 Using a Default Waveform File.........................................................................................................61

6.3.4.2 Using a Custom Waveform File.........................................................................................................61

6.3.5 SPDC Panel Initialization..................................................................................................................................62

6.3.6 Grayscale Framebuffer Selection.......................................................................................................................62

6.4 Source Code Structure ...................................................................................................................................................63

6.5 Menu Configuration Options..........................................................................................................................................64

6.6 Programming Interface...................................................................................................................................................64

6.6.1 IOCTLs/Functions.............................................................................................................................................65

6.6.2 Structures and Defines.......................................................................................................................................68

Chapter 7

Pixel Pipeline (PxP) DMA-ENGINE Driver

7.1 Introduction.....................................................................................................................................................................71

7.2 Hardware Operation........................................................................................................................................................71

7.3 Software Operation.........................................................................................................................................................71

7.3.1 Key Data Structs................................................................................................................................................71

7.3.2 Channel Management........................................................................................................................................72

7.3.3 Descriptor Management.....................................................................................................................................72

7.3.4 Completion Notification....................................................................................................................................72

7.3.5 Limitations.........................................................................................................................................................73

7.4 Menu Configuration Options..........................................................................................................................................73

7.5 Source Code Structure....................................................................................................................................................73

Chapter 8

ELCDIF Frame Buffer Driver

8.1 Introduction.....................................................................................................................................................................75

8.2 Hardware Operation........................................................................................................................................................75

8.3 Software Operation.........................................................................................................................................................75

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8.4 Menu Configuration Options..........................................................................................................................................76

8.5 Source Code Structure....................................................................................................................................................76

Chapter 9

Graphics Processing Unit (GPU)

9.1 Introduction.....................................................................................................................................................................77

9.1.1 Driver Features...................................................................................................................................................77

9.1.1.1 Hardware Operation...........................................................................................................................77

9.1.1.2 Software Operation............................................................................................................................78

9.1.1.3 Source Code Structure ......................................................................................................................78

9.1.1.4 Library Structure ...............................................................................................................................78

9.1.1.5 API References..................................................................................................................................80

9.1.1.6 Menu Configuration Options.............................................................................................................80

Chapter 10

High-Definition Multimedia Interface (HDMI)

10.1 Introduction.....................................................................................................................................................................81

10.2 Software Operation.........................................................................................................................................................81

10.2.1 Hotplug Handling and Video Mode Changes....................................................................................................81

10.3 Source Code Structure....................................................................................................................................................82

10.3.1 Linux Menu Configuration Options...................................................................................................................83

10.4 Unit Test..........................................................................................................................................................................83

10.4.1 Video..................................................................................................................................................................83

10.4.2 Audio..................................................................................................................................................................84

Chapter 11

X Windows Acceleration

11.1 Introduction.....................................................................................................................................................................85

11.2 Hardware Operation........................................................................................................................................................85

11.3 Software Operation.........................................................................................................................................................85

11.3.1 X Windows Acceleration Architecture..............................................................................................................86

11.3.2 i.MX 6 Driver for X-Windows System..............................................................................................................87

11.3.3 xorg.conf for i.MX 6..........................................................................................................................................89

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11.3.4 Setup X-Windows System Acceleration............................................................................................................90

Chapter 12

Camera Sensor Interface (CSI) Driver

12.1 Hardware Operation........................................................................................................................................................93

12.2 Software Operation.........................................................................................................................................................93

12.2.1 CSI Software Operation.....................................................................................................................................94

12.2.2 Video for Linux 2 (V4L2) APIs.........................................................................................................................94

12.2.2.1 V4L2 Capture Device........................................................................................................................94

12.2.2.2 Use of the V4L2 Capture APIs..........................................................................................................95

12.3 Source Code Structure....................................................................................................................................................95

12.4 Linux Menu Configuration Options................................................................................................................................96

12.5 Programming Interface...................................................................................................................................................96

Chapter 13

OV5640 Using parallel interface

13.1 Hardware Operation........................................................................................................................................................97

13.2 Software Operation.........................................................................................................................................................97

13.3 Source Code Structure....................................................................................................................................................98

13.4 Linux Menu Configuration Options................................................................................................................................98

Chapter 14

Low-level Power Management (PM) Driver

14.1 Hardware Operation........................................................................................................................................................99

14.1.1 Software Operation............................................................................................................................................99

14.1.2 Source Code Structure.......................................................................................................................................100

14.1.3 Menu Configuration Options.............................................................................................................................100

14.1.4 Programming Interface......................................................................................................................................101

14.1.5 Unit Test.............................................................................................................................................................101

Chapter 15

PF100 Regulator Driver

15.1 Introduction.....................................................................................................................................................................103

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15.2 Hardware Operation........................................................................................................................................................103

15.2.1 Driver Features...................................................................................................................................................104

15.3 Software Operation.........................................................................................................................................................104

15.3.1 Regulator APIs...................................................................................................................................................104

15.4 Driver Architecture.........................................................................................................................................................106

15.4.1 Driver Interface Details......................................................................................................................................107

15.4.2 Source Code Structure.......................................................................................................................................107

15.4.3 Menu Configuration Options.............................................................................................................................107

Chapter 16

CPU Frequency Scaling (CPUFREQ) Driver

16.1 Introduction.....................................................................................................................................................................109

16.1.1 Software Operation............................................................................................................................................109

16.1.2 Source Code Structure.......................................................................................................................................110

16.2 Menu Configuration Options..........................................................................................................................................110

16.2.1 Board Configuration Options.............................................................................................................................111

Chapter 17

Dynamic Voltage Frequency Scaling (DVFS) Driver

17.1 Introduction.....................................................................................................................................................................113

17.1.1 Operation............................................................................................................................................................113

17.1.2 Software Operation............................................................................................................................................113

17.1.3 Source Code Structure.......................................................................................................................................114

17.2 Menu Configuration Options..........................................................................................................................................114

17.2.1 Board Configuration Options.............................................................................................................................114

Chapter 18

Thermal Driver

18.1 Introduction.....................................................................................................................................................................115

18.1.1 Thermal Driver Overview..................................................................................................................................115

18.2 Hardware Operation........................................................................................................................................................115

18.2.1 Thermal Driver Software Operation..................................................................................................................116

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18.3 Driver Features................................................................................................................................................................116

18.3.1 Source Code Structure.......................................................................................................................................116

18.3.2 Menu Configuration Options.............................................................................................................................116

18.3.3 Programming Interface......................................................................................................................................116

18.3.4 Interrupt Requirements......................................................................................................................................117

18.4 Unit Test..........................................................................................................................................................................117

Chapter 19

Anatop Regulator Driver

19.1 Introduction.....................................................................................................................................................................119

19.1.1 Hardware Operation...........................................................................................................................................119

19.2 Driver Features................................................................................................................................................................120

19.2.1 Software Operation............................................................................................................................................120

19.2.2 Regulator APIs...................................................................................................................................................120

19.2.3 Driver Interface Details......................................................................................................................................121

19.2.4 Source Code Structure.......................................................................................................................................121

19.2.5 Menu Configuration Options.............................................................................................................................121

Chapter 20

SNVS Real Time Clock (SRTC) Driver

20.1 Introduction.....................................................................................................................................................................123

20.1.1 Hardware Operation...........................................................................................................................................123

20.2 Software Operation.........................................................................................................................................................123

20.2.1 IOCTL................................................................................................................................................................123

20.2.2 Keeping Alive in the Power Off State...............................................................................................................124

20.3 Driver Features................................................................................................................................................................124

20.3.1 Source Code Structure.......................................................................................................................................125

20.3.2 Menu Configuration Options.............................................................................................................................125

Chapter 21

Advanced Linux Sound Architecture (ALSA) System on a Chip (ASoC) Sound Driver

21.1 ALSA Sound Driver Introduction...................................................................................................................................127

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