dm: Add support for generic system controllers (syscon)
Many SoCs have a number of system controllers which are dealt with as a
group by a single driver. It is a pain to have to add lots of compatible
strings and/or separate drivers for each. Instead we can identify the
controllers by a number and request the address of the one we want.
Add a simple implementation of this which can be used by SoC driver code.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/syscon-uclass.c b/drivers/core/syscon-uclass.c
new file mode 100644
index 0000000..4d66bb5
--- /dev/null
+++ b/drivers/core/syscon-uclass.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <syscon.h>
+#include <dm.h>
+#include <errno.h>
+#include <regmap.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+#include <linux/err.h>
+
+struct regmap *syscon_get_regmap(struct udevice *dev)
+{
+ struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
+
+ return priv->regmap;
+}
+
+static int syscon_pre_probe(struct udevice *dev)
+{
+ struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
+
+ return regmap_init_mem(dev, &priv->regmap);
+}
+
+struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
+{
+ struct udevice *dev;
+ struct uclass *uc;
+ int ret;
+
+ ret = uclass_get(UCLASS_SYSCON, &uc);
+ if (ret)
+ return ERR_PTR(ret);
+ uclass_foreach_dev(dev, uc) {
+ if (dev->driver_data == driver_data) {
+ struct syscon_uc_info *priv;
+ int ret;
+
+ ret = device_probe(dev);
+ if (ret)
+ return ERR_PTR(ret);
+ priv = dev_get_uclass_priv(dev);
+
+ return priv->regmap;
+ }
+ }
+
+ return ERR_PTR(-ENOENT);
+}
+
+void *syscon_get_first_range(ulong driver_data)
+{
+ struct regmap *map;
+
+ map = syscon_get_regmap_by_driver_data(driver_data);
+ if (IS_ERR(map))
+ return map;
+ return regmap_get_range(map, 0);
+}
+
+UCLASS_DRIVER(syscon) = {
+ .id = UCLASS_SYSCON,
+ .name = "syscon",
+ .per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
+ .pre_probe = syscon_pre_probe,
+};