core: remap: fix regmap_init_mem_plat() reg size handeling

The fdt_addr_t and phys_addr_t size have been decoupled.
A 32bit CPU can expect 64-bit data from the device tree parser,
so convert regmap_init_mem_plat() input to handel both. The
syscon class driver also makes use of the regmap_init_mem_plat()
function, but has no way of knowing the format of the
device-specific platform data. In case of odd reg structures other
then that the syscon class driver assumes the regmap must be
filled in the individual syscon driver before pre-probe.
Also fix the ARRAY_SIZE divider in the syscon class driver.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/core/regmap.c

@@ -79,7 +79,7 @@ static struct regmap *regmap_alloc(int count)
 }
 
 #if CONFIG_IS_ENABLED(OF_PLATDATA)
-int regmap_init_mem_plat(struct udevice *dev, fdt_val_t *reg, int count,
+int regmap_init_mem_plat(struct udevice *dev, void *reg, int size, int count,
 			 struct regmap **mapp)
 {
 	struct regmap_range *range;
@@ -89,9 +89,24 @@ int regmap_init_mem_plat(struct udevice *dev, fdt_val_t *reg, int count,
 	if (!map)
 		return -ENOMEM;
 
-	for (range = map->ranges; count > 0; reg += 2, range++, count--) {
-		range->start = *reg;
-		range->size = reg[1];
+	if (size == sizeof(fdt32_t)) {
+		fdt32_t *ptr = (fdt32_t *)reg;
+
+		for (range = map->ranges; count > 0;
+		     ptr += 2, range++, count--) {
+			range->start = *ptr;
+			range->size = ptr[1];
+		}
+	} else if (size == sizeof(fdt64_t)) {
+		fdt64_t *ptr = (fdt64_t *)reg;
+
+		for (range = map->ranges; count > 0;
+		     ptr += 2, range++, count--) {
+			range->start = *ptr;
+			range->size = ptr[1];
+		}
+	} else {
+		return -EINVAL;
 	}
 
 	*mapp = map;

drivers/core/syscon-uclass.c

@@ -49,17 +49,30 @@ static int syscon_pre_probe(struct udevice *dev)
 	if (device_get_uclass_id(dev->parent) == UCLASS_PCI)
 		return 0;
 
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
 	/*
 	 * With OF_PLATDATA we really have no way of knowing the format of
 	 * the device-specific platform data. So we assume that it starts with
-	 * a 'reg' member, and this holds a single address and size. Drivers
-	 * using OF_PLATDATA will need to ensure that this is true.
+	 * a 'reg' member that holds a single address and size. Drivers
+	 * using OF_PLATDATA will need to ensure that this is true. In case of
+	 * odd reg structures other then the syscon_base_plat structure
+	 * below the regmap must be defined in the individual syscon driver.
 	 */
-#if CONFIG_IS_ENABLED(OF_PLATDATA)
+	struct syscon_base_plat {
+		phys_addr_t reg[2];
+	};
+
 	struct syscon_base_plat *plat = dev_get_plat(dev);
 
-	return regmap_init_mem_plat(dev, plat->reg, ARRAY_SIZE(plat->reg),
-					&priv->regmap);
+	/*
+	 * Return if the regmap is already defined in the individual
+	 * syscon driver.
+	 */
+	if (priv->regmap)
+		return 0;
+
+	return regmap_init_mem_plat(dev, plat->reg, sizeof(plat->reg[0]),
+				    ARRAY_SIZE(plat->reg) / 2, &priv->regmap);
 #else
 	return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
 #endif

drivers/ram/rockchip/sdram_rk3066.c

@@ -801,7 +801,7 @@ static int rk3066_dmc_conv_of_plat(struct udevice *dev)
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 	/* RK3066 supports dual-channel, set default channel num to 2. */
 	plat->num_channels = 1;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;

drivers/ram/rockchip/sdram_rk3188.c

@@ -867,7 +867,7 @@ static int conv_of_plat(struct udevice *dev)
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 	/* rk3188 supports dual-channel, set default channel num to 2 */
 	plat->num_channels = 1;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;

drivers/ram/rockchip/sdram_rk322x.c

@@ -769,7 +769,7 @@ static int conv_of_plat(struct udevice *dev)
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 
 	plat->num_channels = 1;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;

drivers/ram/rockchip/sdram_rk3288.c

@@ -1029,7 +1029,7 @@ static int conv_of_plat(struct udevice *dev)
 	memcpy(&plat->base, of_plat->rockchip_sdram_params, sizeof(plat->base));
 	/* Rk3288 supports dual-channel, set default channel num to 2 */
 	plat->num_channels = 2;
-	ret = regmap_init_mem_plat(dev, of_plat->reg,
+	ret = regmap_init_mem_plat(dev, of_plat->reg, sizeof(of_plat->reg[0]),
 				   ARRAY_SIZE(of_plat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;

drivers/ram/rockchip/sdram_rk3328.c

@@ -54,7 +54,7 @@ static int conv_of_plat(struct udevice *dev)
 	struct dtd_rockchip_rk3328_dmc *dtplat = &plat->dtplat;
 	int ret;
 
-	ret = regmap_init_mem_plat(dev, dtplat->reg,
+	ret = regmap_init_mem_plat(dev, dtplat->reg, sizeof(dtplat->reg[0]),
 				   ARRAY_SIZE(dtplat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;

drivers/ram/rockchip/sdram_rk3399.c

@@ -3050,7 +3050,7 @@ static int conv_of_plat(struct udevice *dev)
 	struct dtd_rockchip_rk3399_dmc *dtplat = &plat->dtplat;
 	int ret;
 
-	ret = regmap_init_mem_plat(dev, dtplat->reg,
+	ret = regmap_init_mem_plat(dev, dtplat->reg, sizeof(dtplat->reg[0]),
 				   ARRAY_SIZE(dtplat->reg) / 2, &plat->map);
 	if (ret)
 		return ret;

include/regmap.h

@@ -378,17 +378,18 @@ int regmap_init_mem(ofnode node, struct regmap **mapp);
  *
  * @dev:	Device that uses this map
  * @reg:	List of address, size pairs
+ * @size:	Size of one reg array item
  * @count:	Number of pairs (e.g. 1 if the regmap has a single entry)
  * @mapp:	Returns allocated map
  * Return: 0 if OK, -ve on error
  *
  * This creates a new regmap with a list of regions passed in, rather than
- * using the device tree. It only supports 32-bit machines.
+ * using the device tree.
  *
  * Use regmap_uninit() to free it.
  *
  */
-int regmap_init_mem_plat(struct udevice *dev, fdt_val_t *reg, int count,
+int regmap_init_mem_plat(struct udevice *dev, void *reg, int size, int count,
 			 struct regmap **mapp);
 
 int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index);

include/syscon.h

@@ -25,19 +25,6 @@ struct syscon_ops {
 
 #define syscon_get_ops(dev)        ((struct syscon_ops *)(dev)->driver->ops)
 
-#if CONFIG_IS_ENABLED(OF_PLATDATA)
-/*
- * We don't support 64-bit machines. If they are so resource-contrained that
- * they need to use OF_PLATDATA, something is horribly wrong with the
- * education of our hardware engineers.
- *
- * Update: 64-bit is now supported and we have an education crisis.
- */
-struct syscon_base_plat {
-	fdt_val_t reg[2];
-};
-#endif
-
 /**
  * syscon_get_regmap() - Get access to a register map
  *