Powerpc/esdhc: Add simple description of esdhc register

Add some descriptions for esdhc register for easily using.

Signed-off-by: Haijun Zhang <haijun.zhang@freescale.com>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>

diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c
index bd8c539a571c7201af880c4e7bc14267b1f0a6c5..a9fe911c8b313340a5a049ac1025464d403999f4 100644 (file)
--- a/drivers/mmc/fsl_esdhc.c
+++ b/drivers/mmc/fsl_esdhc.c
@@ -24,43 +24,43 @@
 DECLARE_GLOBAL_DATA_PTR;
 
 struct fsl_esdhc {
-       uint    dsaddr;
-       uint    blkattr;
-       uint    cmdarg;
-       uint    xfertyp;
-       uint    cmdrsp0;
-       uint    cmdrsp1;
-       uint    cmdrsp2;
-       uint    cmdrsp3;
-       uint    datport;
-       uint    prsstat;
-       uint    proctl;
-       uint    sysctl;
-       uint    irqstat;
-       uint    irqstaten;
-       uint    irqsigen;
-       uint    autoc12err;
-       uint    hostcapblt;
-       uint    wml;
-       uint    mixctrl;
-       char    reserved1[4];
-       uint    fevt;
-       uint    admaes;
-       uint    adsaddr;
-       char    reserved2[160];
-       uint    hostver;
-       char    reserved3[4];
-       uint    dmaerraddr;
-       char    reserved4[4];
-       uint    dmaerrattr;
-       char    reserved5[4];
-       uint    hostcapblt2;
-       char    reserved6[8];
-       uint    tcr;
-       char    reserved7[28];
-       uint    sddirctl;
-       char    reserved8[712];
-       uint    scr;
+       uint    dsaddr;         /* SDMA system address register */
+       uint    blkattr;        /* Block attributes register */
+       uint    cmdarg;         /* Command argument register */
+       uint    xfertyp;        /* Transfer type register */
+       uint    cmdrsp0;        /* Command response 0 register */
+       uint    cmdrsp1;        /* Command response 1 register */
+       uint    cmdrsp2;        /* Command response 2 register */
+       uint    cmdrsp3;        /* Command response 3 register */
+       uint    datport;        /* Buffer data port register */
+       uint    prsstat;        /* Present state register */
+       uint    proctl;         /* Protocol control register */
+       uint    sysctl;         /* System Control Register */
+       uint    irqstat;        /* Interrupt status register */
+       uint    irqstaten;      /* Interrupt status enable register */
+       uint    irqsigen;       /* Interrupt signal enable register */
+       uint    autoc12err;     /* Auto CMD error status register */
+       uint    hostcapblt;     /* Host controller capabilities register */
+       uint    wml;            /* Watermark level register */
+       uint    mixctrl;        /* For USDHC */
+       char    reserved1[4];   /* reserved */
+       uint    fevt;           /* Force event register */
+       uint    admaes;         /* ADMA error status register */
+       uint    adsaddr;        /* ADMA system address register */
+       char    reserved2[160]; /* reserved */
+       uint    hostver;        /* Host controller version register */
+       char    reserved3[4];   /* reserved */
+       uint    dmaerraddr;     /* DMA error address register */
+       char    reserved4[4];   /* reserved */
+       uint    dmaerrattr;     /* DMA error attribute register */
+       char    reserved5[4];   /* reserved */
+       uint    hostcapblt2;    /* Host controller capabilities register 2 */
+       char    reserved6[8];   /* reserved */
+       uint    tcr;            /* Tuning control register */
+       char    reserved7[28];  /* reserved */
+       uint    sddirctl;       /* SD direction control register */
+       char    reserved8[712]; /* reserved */
+       uint    scr;            /* eSDHC control register */
 };
 
 /* Return the XFERTYP flags for a given command and data packet */