本文主要是介绍对Freescale i.mx53 ADC驱动程序的透彻分析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
对Freescale i.mx53 ADC驱动程序的透彻分析
应该说是freescalebsp提供了N多的东东，但是相对于三星提供的来说要复杂一些，感觉三星的简单，飞思将这些东东弄得复杂了。当然，这只是我个人见解，也有可能当初在学校接触的是s3c2410，所以现在才这样说。哈哈。见笑了。
飞思将ADC的驱动程序放在drivers/mxc/adc目录下，这个目录下有以下几个文件：
Imx_adc.c 这个实现的就是ADC的驱动程序
Imx_adc_reg.h 这个主要就是定义了跟ADC相关的一些寄存器
Kconfig 使用make menuconfig配置时必须配置的文件
Makefile 编译文件
首先，咱们来看看Kconfig文件，这个比较简单的：
Menu “i.MX ADC support”
Config IMX_ADC 此处会被定义成宏的！Makefile里就是在之前加CONFIG-
Tristate“i.MX ADC”
Dependson ARCH_MXC
Defaultn
Help
Thisselects the Freescale i.MX on-chip ADC driver.
Endmenu
这个文件应该没有好说的吧。我绍言在这里也不多说了。如果不懂的话，自己去看看我的博客里写的《如何在Linux2.6中增加自己的驱动程序》。
下面来看一下Makefile，如下：
Obj-$(CONFIG_IMX_ADC) += imx_adc.o
这些都是例行公事，最最主要的还是看驱动源码啊。看吧。为了深入进去，这里还是不限篇幅，列出源码，一条一条的分析！
#ifndef __IMX_ADC_H__
#define __IMX_ADC_H__
/* TSC General Config Register */
#define TGCR 0x000
#define TGCR_IPG_CLK_EN (1 << 0)
#define TGCR_TSC_RST (1 << 1)
#define TGCR_FUNC_RST (1 << 2)
#define TGCR_SLPC (1 << 4)
#define TGCR_STLC (1 << 5)
#define TGCR_HSYNC_EN (1 << 6)
#define TGCR_HSYNC_POL (1 << 7)
#define TGCR_POWERMODE_SHIFT 8
#define TGCR_POWER_OFF (0x0 << TGCR_POWERMODE_SHIFT)
#define TGCR_POWER_SAVE (0x1 << TGCR_POWERMODE_SHIFT)
#define TGCR_POWER_ON (0x3 << TGCR_POWERMODE_SHIFT)
#define TGCR_POWER_MASK (0x3 << TGCR_POWERMODE_SHIFT)
#define TGCR_INTREFEN (1 << 10)
#define TGCR_ADCCLKCFG_SHIFT 16
#define TGCR_PD_EN (1 << 23)
#define TGCR_PDB_EN (1 << 24)
#define TGCR_PDBTIME_SHIFT 25
#define TGCR_PDBTIME128 (0x3f << TGCR_PDBTIME_SHIFT)
#define TGCR_PDBTIME_MASK (0x7f << TGCR_PDBTIME_SHIFT)
/* TSC General Status Register */
#define TGSR 0x004
#define TCQ_INT (1 << 0)
#define GCQ_INT (1 << 1)
#define SLP_INT (1 << 2)
#define TCQ_DMA (1 << 16)
#define GCQ_DMA (1 << 17)
/* TSC IDLE Config Register */
#define TICR 0x008
/* TouchScreen Convert Queue FIFO Register */
#define TCQFIFO 0x400
/* TouchScreen Convert Queue Control Register */
#define TCQCR 0x404
#define CQCR_QSM_SHIFT 0
#define CQCR_QSM_STOP (0x0 << CQCR_QSM_SHIFT)
#define CQCR_QSM_PEN (0x1 << CQCR_QSM_SHIFT)
#define CQCR_QSM_FQS (0x2 << CQCR_QSM_SHIFT)
#define CQCR_QSM_FQS_PEN (0x3 << CQCR_QSM_SHIFT)
#define CQCR_QSM_MASK (0x3 << CQCR_QSM_SHIFT)
#define CQCR_FQS (1 << 2)
#define CQCR_RPT (1 << 3)
#define CQCR_LAST_ITEM_ID_SHIFT 4
#define CQCR_LAST_ITEM_ID_MASK (0xf << CQCR_LAST_ITEM_ID_SHIFT)
#define CQCR_FIFOWATERMARK_SHIFT 8
#define CQCR_FIFOWATERMARK_MASK (0xf << CQCR_FIFOWATERMARK_SHIFT)
#define CQCR_REPEATWAIT_SHIFT 12
#define CQCR_REPEATWAIT_MASK (0xf << CQCR_REPEATWAIT_SHIFT)
#define CQCR_QRST (1 << 16)
#define CQCR_FRST (1 << 17)
#define CQCR_PD_MSK (1 << 18)
#define CQCR_PD_CFG (1 << 19)
/* TouchScreen Convert Queue Status Register */
#define TCQSR 0x408
#define CQSR_PD (1 << 0)
#define CQSR_EOQ (1 << 1)
#define CQSR_FOR (1 << 4)
#define CQSR_FUR (1 << 5)
#define CQSR_FER (1 << 6)
#define CQSR_EMPT (1 << 13)
#define CQSR_FULL (1 << 14)
#define CQSR_FDRY (1 << 15)
/* TouchScreen Convert Queue Mask Register */
#define TCQMR 0x40c
#define TCQMR_PD_IRQ_MSK (1 << 0)
#define TCQMR_EOQ_IRQ_MSK (1 << 1)
#define TCQMR_FOR_IRQ_MSK (1 << 4)
#define TCQMR_FUR_IRQ_MSK (1 << 5)
#define TCQMR_FER_IRQ_MSK (1 << 6)
#define TCQMR_PD_DMA_MSK (1 << 16)
#define TCQMR_EOQ_DMA_MSK (1 << 17)
#define TCQMR_FOR_DMA_MSK (1 << 20)
#define TCQMR_FUR_DMA_MSK (1 << 21)
#define TCQMR_FER_DMA_MSK (1 << 22)
#define TCQMR_FDRY_DMA_MSK (1 << 31)
/* TouchScreen Convert Queue ITEM 7~0 */
#define TCQ_ITEM_7_0 0x420
/* TouchScreen Convert Queue ITEM 15~8 */
#define TCQ_ITEM_15_8 0x424
#define TCQ_ITEM7_SHIFT 28
#define TCQ_ITEM6_SHIFT 24
#define TCQ_ITEM5_SHIFT 20
#define TCQ_ITEM4_SHIFT 16
#define TCQ_ITEM3_SHIFT 12
#define TCQ_ITEM2_SHIFT 8
#define TCQ_ITEM1_SHIFT 4
#define TCQ_ITEM0_SHIFT 0
#define TCQ_ITEM_TCC0 0x0
#define TCQ_ITEM_TCC1 0x1
#define TCQ_ITEM_TCC2 0x2
#define TCQ_ITEM_TCC3 0x3
#define TCQ_ITEM_TCC4 0x4
#define TCQ_ITEM_TCC5 0x5
#define TCQ_ITEM_TCC6 0x6
#define TCQ_ITEM_TCC7 0x7
#define TCQ_ITEM_GCC7 0x8
#define TCQ_ITEM_GCC6 0x9
#define TCQ_ITEM_GCC5 0xa
#define TCQ_ITEM_GCC4 0xb
#define TCQ_ITEM_GCC3 0xc
#define TCQ_ITEM_GCC2 0xd
#define TCQ_ITEM_GCC1 0xe
#define TCQ_ITEM_GCC0 0xf
/* TouchScreen Convert Config 0-7 */
#define TCC0 0x440
#define TCC1 0x444
#define TCC2 0x448
#define TCC3 0x44c
#define TCC4 0x450
#define TCC5 0x454
#define TCC6 0x458
#define TCC7 0x45c
#define CC_PEN_IACK (1 << 1)
#define CC_SEL_REFN_SHIFT 2
#define CC_SEL_REFN_YNLR (0x1 << CC_SEL_REFN_SHIFT)
#define CC_SEL_REFN_AGND (0x2 << CC_SEL_REFN_SHIFT)
#define CC_SEL_REFN_MASK (0x3 << CC_SEL_REFN_SHIFT)
#define CC_SELIN_SHIFT 4
#define CC_SELIN_XPUL (0x0 << CC_SELIN_SHIFT)
#define CC_SELIN_YPLL (0x1 << CC_SELIN_SHIFT)
#define CC_SELIN_XNUR (0x2 << CC_SELIN_SHIFT)
#define CC_SELIN_YNLR (0x3 << CC_SELIN_SHIFT)
#define CC_SELIN_WIPER (0x4 << CC_SELIN_SHIFT)
#define CC_SELIN_INAUX0 (0x5 << CC_SELIN_SHIFT)
#define CC_SELIN_INAUX1 (0x6 << CC_SELIN_SHIFT)
#define CC_SELIN_INAUX2 (0x7 << CC_SELIN_SHIFT)
#define CC_SELIN_MASK (0x7 << CC_SELIN_SHIFT)
#define CC_SELREFP_SHIFT 7
#define CC_SELREFP_YPLL (0x0 << CC_SELREFP_SHIFT)
#define CC_SELREFP_XPUL (0x1 << CC_SELREFP_SHIFT)
#define CC_SELREFP_EXT (0x2 << CC_SELREFP_SHIFT)
#define CC_SELREFP_INT (0x3 << CC_SELREFP_SHIFT)
#define CC_SELREFP_MASK (0x3 << CC_SELREFP_SHIFT)
#define CC_XPULSW (1 << 9)
#define CC_XNURSW_SHIFT 10
#define CC_XNURSW_HIGH (0x0 << CC_XNURSW_SHIFT)
#define CC_XNURSW_OFF (0x1 << CC_XNURSW_SHIFT)
#define CC_XNURSW_LOW (0x3 << CC_XNURSW_SHIFT)
#define CC_XNURSW_MASK (0x3 << CC_XNURSW_SHIFT)
#define CC_YPLLSW_SHIFT 12
#define CC_YPLLSW_MASK (0x3 << CC_YPLLSW_SHIFT)
#define CC_YNLRSW (1 << 14)
#define CC_WIPERSW (1 << 15)
#define CC_NOS_SHIFT 16
#define CC_YPLLSW_HIGH (0x0 << CC_NOS_SHIFT)
#define CC_YPLLSW_OFF (0x1 << CC_NOS_SHIFT)
#define CC_YPLLSW_LOW (0x3 << CC_NOS_SHIFT)
#define CC_NOS_MASK (0xf << CC_NOS_SHIFT)
#define CC_IGS (1 << 20)
#define CC_SETTLING_TIME_SHIFT 24
#define CC_SETTLING_TIME_MASK (0xff <<CC_SETTLING_TIME_SHIFT)
#define TSC_4WIRE_PRECHARGE 0x158c
#define TSC_4WIRE_TOUCH_DETECT 0x578e
#define TSC_4WIRE_X_MEASUMENT 0x1c90
#define TSC_4WIRE_Y_MEASUMENT 0x4604
#define TSC_GENERAL_ADC_GCC0 0x17dc
#define TSC_GENERAL_ADC_GCC1 0x17ec
#define TSC_GENERAL_ADC_GCC2 0x17fc
/* GeneralADC Convert Queue FIFO Register */
#define GCQFIFO 0x800
#define GCQFIFO_ADCOUT_SHIFT 4
#define GCQFIFO_ADCOUT_MASK (0xfff << GCQFIFO_ADCOUT_SHIFT)
/* GeneralADC Convert Queue Control Register */
#define GCQCR 0x804
/* GeneralADC Convert Queue Status Register */
#define GCQSR 0x808
/* GeneralADC Convert Queue Mask Register */
#define GCQMR 0x80c
/* GeneralADC Convert Queue ITEM 7~0 */
#define GCQ_ITEM_7_0 0x820
/* GeneralADC Convert Queue ITEM 15~8 */
#define GCQ_ITEM_15_8 0x824
#define GCQ_ITEM7_SHIFT 28
#define GCQ_ITEM6_SHIFT 24
#define GCQ_ITEM5_SHIFT 20
#define GCQ_ITEM4_SHIFT 16
#define GCQ_ITEM3_SHIFT 12
#define GCQ_ITEM2_SHIFT 8
#define GCQ_ITEM1_SHIFT 4
#define GCQ_ITEM0_SHIFT 0
#define GCQ_ITEM_GCC0 0x0
#define GCQ_ITEM_GCC1 0x1
#define GCQ_ITEM_GCC2 0x2
#define GCQ_ITEM_GCC3 0x3
/* GeneralADC Convert Config 0-7 */
#define GCC0 0x840
#define GCC1 0x844
#define GCC2 0x848
#define GCC3 0x84c
#define GCC4 0x850
#define GCC5 0x854
#define GCC6 0x858
#define GCC7 0x85c
/* TSC Test Register R/W */
#define TTR 0xc00
/* TSC Monitor Register 1, 2 */
#define MNT1 0xc04
#define MNT2 0xc04
#define DETECT_ITEM_ID_1 1
#define DETECT_ITEM_ID_2 5
#define TS_X_ITEM_ID 2
#define TS_Y_ITEM_ID 3
#define TSI_DATA 1
#def
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