[PATCH v2 1/2] ethtool: changes of emac_regs structure accordingly within driver emac_regs structure.

* do the redefinition of emac_regs struct from driver structure
perspective and passing size from actual struct size, not from memory
area variable which set in dts file.

* passing variable from dts option may cause a problem with output
below MII's section which we're fixing with this and 5369c71 commit
in kernel.

Signed-off-by: Ivan Mikhaylov <redacted>
---
 ibm_emac.c |  101
+++++++++++++++++++++++++++++++++++++++++++----------------- 1 file
changed, 73 insertions(+), 28 deletions(-)

diff --git a/ibm_emac.c b/ibm_emac.c
index e128e48..da6c28e 100644
--- a/ibm_emac.c
+++ b/ibm_emac.c

@@ -32,35 +32,78 @@ struct emac_ethtool_regs_subhdr {
 };
 
 struct emac_regs {
-	u32 mr0;
-	u32 mr1;
-	u32 tmr0;
-	u32 tmr1;
-	u32 rmr;
-	u32 isr;
-	u32 iser;
-	u32 iahr;
-	u32 ialr;
-	u32 vtpid;
-	u32 vtci;
-	u32 ptr;
-	u32 iaht1;
-	u32 iaht2;
-	u32 iaht3;
-	u32 iaht4;
-	u32 gaht1;
-	u32 gaht2;
-	u32 gaht3;
-	u32 gaht4;
+	/* Common registers across all EMAC implementations. */
+	u32 mr0;			/* Special 	*/
+	u32 mr1;			/* Reset 	*/
+	u32 tmr0;			/* Special 	*/
+	u32 tmr1;			/* Special 	*/
+	u32 rmr;			/* Reset 	*/
+	u32 isr;			/* Always 	*/
+	u32 iser;			/* Reset 	*/
+	u32 iahr;			/* Reset, R, T 	*/
+	u32 ialr;			/* Reset, R, T 	*/
+	u32 vtpid;			/* Reset, R, T 	*/
+	u32 vtci;			/* Reset, R, T 	*/
+	u32 ptr;			/* Reset,    T 	*/
+	union {
+		/* Registers unique to EMAC4 implementations */
+		struct {
+			u32 iaht1;	/* Reset, R	*/
+			u32 iaht2;	/* Reset, R	*/
+			u32 iaht3;	/* Reset, R	*/
+			u32 iaht4;	/* Reset, R	*/
+			u32 gaht1;	/* Reset, R	*/
+			u32 gaht2;	/* Reset, R	*/
+			u32 gaht3;	/* Reset, R	*/
+			u32 gaht4;	/* Reset, R	*/
+		} emac4;
+		/* Registers unique to EMAC4SYNC implementations */
+		struct {
+			u32 mahr;	/* Reset, R, T  */
+			u32 malr;	/* Reset, R, T  */
+			u32 mmahr;	/* Reset, R, T  */
+			u32 mmalr;	/* Reset, R, T  */
+			u32 rsvd0[4];
+		} emac4sync;
+	} u0;
+	/* Common registers across all EMAC implementations. */
 	u32 lsah;
 	u32 lsal;
-	u32 ipgvr;
-	u32 stacr;
-	u32 trtr;
-	u32 rwmr;
+	u32 ipgvr;			/* Reset,    T 	*/
+	u32 stacr;			/* Special 	*/
+	u32 trtr;			/* Special 	*/
+	u32 rwmr;			/* Reset 	*/
 	u32 octx;
 	u32 ocrx;
-	u32 ipcr;
+	union {
+		/* Registers unique to EMAC4 implementations */
+		struct {
+			u32 ipcr;
+		} emac4;
+		/* Registers unique to EMAC4SYNC implementations */
+		struct {
+			u32 rsvd1;
+			u32 revid;
+			u32 rsvd2[2];
+			u32 iaht1;	/* Reset, R     */
+			u32 iaht2;	/* Reset, R     */
+			u32 iaht3;	/* Reset, R     */
+			u32 iaht4;	/* Reset, R     */
+			u32 iaht5;	/* Reset, R     */
+			u32 iaht6;	/* Reset, R     */
+			u32 iaht7;	/* Reset, R     */
+			u32 iaht8;	/* Reset, R     */
+			u32 gaht1;	/* Reset, R     */
+			u32 gaht2;	/* Reset, R     */
+			u32 gaht3;	/* Reset, R     */
+			u32 gaht4;	/* Reset, R     */
+			u32 gaht5;	/* Reset, R     */
+			u32 gaht6;	/* Reset, R     */
+			u32 gaht7;	/* Reset, R     */
+			u32 gaht8;	/* Reset, R     */
+			u32 tpc;	/* Reset, T     */
+		} emac4sync;
+	} u1;
 };
 
 struct mal_regs {

@@ -132,12 +175,14 @@ static void *print_emac_regs(void *buf)
 	       p->trtr, p->rwmr,
 	       p->iahr, p->ialr,
 	       p->lsah, p->lsal,
-	       p->iaht1, p->iaht2, p->iaht3, p->iaht4,
-	       p->gaht1, p->gaht2, p->gaht3, p->gaht4,
+	       p->u0.emac4.iaht1, p->u0.emac4.iaht2,

p->u0.emac4.iaht3,
+	       p->u0.emac4.iaht4,
+	       p->u0.emac4.gaht1, p->u0.emac4.gaht2,
p->u0.emac4.gaht3,
+	       p->u0.emac4.gaht4,
 	       p->vtpid, p->vtci, p->ipgvr, p->stacr, p->octx,
p->ocrx); 
 	if (hdr->version)
-		printf(" IPCR = 0x%08x\n\n", p->ipcr);
+		printf(" IPCR = 0x%08x\n\n", p->u1.emac4.ipcr);
 	else {
 		printf("\n\n");
 		res -= sizeof(u32);