fpga: altera: Turn the switches into table lookup

Add a table of FPGA family with matching functions associated with
it and make all the code just look up the family in that table and
call the associated function instead of the horrible switch voodoo
which was duplicated all over the place.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Pavel Machek <pavel@denx.de>
Acked-by: Pavel Machek <pavel@denx.de>

drivers/fpga/altera.c

@@ -19,6 +19,26 @@
 /* Define FPGA_DEBUG to 1 to get debug printf's */
 #define FPGA_DEBUG	0
 
+static const struct altera_fpga {
+	enum altera_family	family;
+	const char		*name;
+	int			(*load)(Altera_desc *, const void *, size_t);
+	int			(*dump)(Altera_desc *, const void *, size_t);
+	int			(*info)(Altera_desc *);
+} altera_fpga[] = {
+#if defined(CONFIG_FPGA_ACEX1K)
+	{ Altera_ACEX1K, "ACEX1K", ACEX1K_load, ACEX1K_dump, ACEX1K_info },
+	{ Altera_CYC2,   "ACEX1K", ACEX1K_load, ACEX1K_dump, ACEX1K_info },
+#elif defined(CONFIG_FPGA_CYCLON2)
+	{ Altera_ACEX1K, "CycloneII", CYC2_load, CYC2_dump, CYC2_info },
+	{ Altera_CYC2,   "CycloneII", CYC2_load, CYC2_dump, CYC2_info },
+#endif
+#if defined(CONFIG_FPGA_STRATIX_II)
+	{ Altera_StratixII, "StratixII", StratixII_load,
+	  StratixII_dump, StratixII_info },
+#endif
+};
+
 static int altera_validate(Altera_desc *desc, const char *fn)
 {
 	if (!desc) {
@@ -46,113 +66,65 @@ static int altera_validate(Altera_desc *desc, const char *fn)
 	return 0;
 }
 
-/* ------------------------------------------------------------------------- */
-int altera_load(Altera_desc *desc, const void *buf, size_t bsize)
+static const struct altera_fpga *
+altera_desc_to_fpga(Altera_desc *desc, const char *fn)
 {
-	int ret_val = FPGA_FAIL;	/* assume a failure */
+	int i;
 
-	if (altera_validate(desc, (char *)__func__)) {
-		printf("%s: Invalid device descriptor\n", __func__);
-		return FPGA_FAIL;
+	if (altera_validate(desc, fn)) {
+		printf("%s: Invalid device descriptor\n", fn);
+		return NULL;
 	}
 
-	switch (desc->family) {
-	case Altera_ACEX1K:
-	case Altera_CYC2:
-#if defined(CONFIG_FPGA_ACEX1K)
-		debug_cond(FPGA_DEBUG,
-			   "%s: Launching the ACEX1K Loader...\n",
-			   __func__);
-		ret_val = ACEX1K_load (desc, buf, bsize);
-#elif defined(CONFIG_FPGA_CYCLON2)
-		debug_cond(FPGA_DEBUG,
-			   "%s: Launching the CYCLONE II Loader...\n",
-			   __func__);
-		ret_val = CYC2_load (desc, buf, bsize);
-#else
-		printf("%s: No support for ACEX1K devices.\n",
-		       __func__);
-#endif
-		break;
+	for (i = 0; i < ARRAY_SIZE(altera_fpga); i++) {
+		if (desc->family == altera_fpga[i].family)
+			break;
+	}
 
-#if defined(CONFIG_FPGA_STRATIX_II)
-	case Altera_StratixII:
-		debug_cond(FPGA_DEBUG,
-			   "%s: Launching the Stratix II Loader...\n",
-			   __func__);
-		ret_val = StratixII_load (desc, buf, bsize);
-		break;
-#endif
-	default:
-		printf("%s: Unsupported family type, %d\n",
-		       __func__, desc->family);
+	if (i == ARRAY_SIZE(altera_fpga)) {
+		printf("%s: Unsupported family type, %d\n", fn, desc->family);
+		return NULL;
 	}
 
-	return ret_val;
+	return &altera_fpga[i];
 }
 
-int altera_dump(Altera_desc *desc, const void *buf, size_t bsize)
+int altera_load(Altera_desc *desc, const void *buf, size_t bsize)
 {
-	int ret_val = FPGA_FAIL;	/* assume a failure */
+	const struct altera_fpga *fpga = altera_desc_to_fpga(desc, __func__);
 
-	if (altera_validate(desc, (char *)__func__)) {
-		printf("%s: Invalid device descriptor\n", __func__);
+	if (!fpga)
 		return FPGA_FAIL;
-	}
 
-	switch (desc->family) {
-	case Altera_ACEX1K:
-#if defined(CONFIG_FPGA_ACEX)
-		debug_cond(FPGA_DEBUG,
-			   "%s: Launching the ACEX1K Reader...\n",
-			   __func__);
-		ret_val = ACEX1K_dump (desc, buf, bsize);
-#else
-		printf("%s: No support for ACEX1K devices.\n",
-		       __func__);
-#endif
-		break;
+	debug_cond(FPGA_DEBUG, "%s: Launching the %s Loader...\n",
+		   __func__, fpga->name);
+	if (fpga->load)
+		return fpga->load(desc, buf, bsize);
+	return 0;
+}
 
-#if defined(CONFIG_FPGA_STRATIX_II)
-	case Altera_StratixII:
-		debug_cond(FPGA_DEBUG,
-			   "%s: Launching the Stratix II Reader...\n",
-			   __func__);
-		ret_val = StratixII_dump (desc, buf, bsize);
-		break;
-#endif
-	default:
-		printf("%s: Unsupported family type, %d\n",
-		       __func__, desc->family);
-	}
+int altera_dump(Altera_desc *desc, const void *buf, size_t bsize)
+{
+	const struct altera_fpga *fpga = altera_desc_to_fpga(desc, __func__);
 
-	return ret_val;
+	if (!fpga)
+		return FPGA_FAIL;
+
+	debug_cond(FPGA_DEBUG, "%s: Launching the %s Reader...\n",
+		   __func__, fpga->name);
+	if (fpga->dump)
+		return fpga->dump(desc, buf, bsize);
+	return 0;
 }
 
 int altera_info(Altera_desc *desc)
 {
-	int ret_val = FPGA_FAIL;
+	const struct altera_fpga *fpga = altera_desc_to_fpga(desc, __func__);
 
-	if (altera_validate (desc, (char *)__func__)) {
-		printf("%s: Invalid device descriptor\n", __func__);
+	if (!fpga)
 		return FPGA_FAIL;
-	}
 
-	printf("Family:        \t");
-	switch (desc->family) {
-	case Altera_ACEX1K:
-		printf("ACEX1K\n");
-		break;
-	case Altera_CYC2:
-		printf("CYCLON II\n");
-		break;
-	case Altera_StratixII:
-		printf("Stratix II\n");
-		break;
-		/* Add new family types here */
-	default:
-		printf("Unknown family type, %d\n", desc->family);
-	}
+	printf("Family:        \t%s\n", fpga->name);
 
 	printf("Interface type:\t");
 	switch (desc->iface) {
@@ -188,34 +160,11 @@ int altera_info(Altera_desc *desc)
 
 	if (desc->iface_fns) {
 		printf("Device Function Table @ 0x%p\n", desc->iface_fns);
-		switch (desc->family) {
-		case Altera_ACEX1K:
-		case Altera_CYC2:
-#if defined(CONFIG_FPGA_ACEX1K)
-			ACEX1K_info(desc);
-#elif defined(CONFIG_FPGA_CYCLON2)
-			CYC2_info(desc);
-#else
-			/* just in case */
-			printf("%s: No support for ACEX1K devices.\n",
-					__func__);
-#endif
-			break;
-#if defined(CONFIG_FPGA_STRATIX_II)
-		case Altera_StratixII:
-			StratixII_info(desc);
-			break;
-#endif
-			/* Add new family types here */
-		default:
-			/* we don't need a message here - we give one up above */
-			break;
-		}
+		if (fpga->info)
+			fpga->info(desc);
 	} else {
 		printf("No Device Function Table.\n");
 	}
 
-	ret_val = FPGA_SUCCESS;
-
-	return ret_val;
+	return FPGA_SUCCESS;
 }