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authorAngelos Mouzakitis <a.mouzakitis@virtualopensystems.com>2023-10-10 14:33:42 +0000
committerAngelos Mouzakitis <a.mouzakitis@virtualopensystems.com>2023-10-10 14:33:42 +0000
commitaf1a266670d040d2f4083ff309d732d648afba2a (patch)
tree2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/u-boot/drivers/core/syscon-uclass.c
parente02cda008591317b1625707ff8e115a4841aa889 (diff)
Add submodule dependency filesHEADmaster
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/u-boot/drivers/core/syscon-uclass.c')
-rw-r--r--roms/u-boot/drivers/core/syscon-uclass.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/roms/u-boot/drivers/core/syscon-uclass.c b/roms/u-boot/drivers/core/syscon-uclass.c
new file mode 100644
index 000000000..cb33facc7
--- /dev/null
+++ b/roms/u-boot/drivers/core/syscon-uclass.c
@@ -0,0 +1,216 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#define LOG_CATEGORY UCLASS_SYSCON
+
+#include <common.h>
+#include <log.h>
+#include <syscon.h>
+#include <dm.h>
+#include <errno.h>
+#include <regmap.h>
+#include <dm/device-internal.h>
+#include <dm/device_compat.h>
+#include <dm/lists.h>
+#include <dm/root.h>
+#include <linux/err.h>
+
+/*
+ * Caution:
+ * This API requires the given device has already been bound to the syscon
+ * driver. For example,
+ *
+ * compatible = "syscon", "simple-mfd";
+ *
+ * works, but
+ *
+ * compatible = "simple-mfd", "syscon";
+ *
+ * does not. The behavior is different from Linux.
+ */
+struct regmap *syscon_get_regmap(struct udevice *dev)
+{
+ struct syscon_uc_info *priv;
+
+ if (device_get_uclass_id(dev) != UCLASS_SYSCON)
+ return ERR_PTR(-ENOEXEC);
+ 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);
+
+ /* Special case for PCI devices, which don't have a regmap */
+ if (device_get_uclass_id(dev->parent) == UCLASS_PCI)
+ return 0;
+
+ /*
+ * 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.
+ */
+#if CONFIG_IS_ENABLED(OF_PLATDATA)
+ struct syscon_base_plat *plat = dev_get_plat(dev);
+
+ return regmap_init_mem_plat(dev, plat->reg, ARRAY_SIZE(plat->reg),
+ &priv->regmap);
+#else
+ return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
+#endif
+}
+
+static int syscon_probe_by_ofnode(ofnode node, struct udevice **devp)
+{
+ struct udevice *dev, *parent;
+ int ret;
+
+ /* found node with "syscon" compatible, not bounded to SYSCON UCLASS */
+ if (!ofnode_device_is_compatible(node, "syscon")) {
+ log_debug("invalid compatible for syscon device\n");
+ return -EINVAL;
+ }
+
+ /* bound to driver with same ofnode or to root if not found */
+ if (device_find_global_by_ofnode(node, &parent))
+ parent = dm_root();
+
+ /* force bound to syscon class */
+ ret = device_bind_driver_to_node(parent, "syscon",
+ ofnode_get_name(node),
+ node, &dev);
+ if (ret) {
+ dev_dbg(dev, "unable to bound syscon device\n");
+ return ret;
+ }
+ ret = device_probe(dev);
+ if (ret) {
+ dev_dbg(dev, "unable to probe syscon device\n");
+ return ret;
+ }
+
+ *devp = dev;
+ return 0;
+}
+
+struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
+ const char *name)
+{
+ struct udevice *syscon;
+ struct regmap *r;
+ u32 phandle;
+ ofnode node;
+ int err;
+
+ err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
+ name, &syscon);
+ if (err) {
+ /* found node with "syscon" compatible, not bounded to SYSCON */
+ err = ofnode_read_u32(dev_ofnode(dev), name, &phandle);
+ if (err)
+ return ERR_PTR(err);
+
+ node = ofnode_get_by_phandle(phandle);
+ if (!ofnode_valid(node)) {
+ dev_dbg(dev, "unable to find syscon device\n");
+ return ERR_PTR(-EINVAL);
+ }
+ err = syscon_probe_by_ofnode(node, &syscon);
+ if (err)
+ return ERR_PTR(-ENODEV);
+ }
+
+ r = syscon_get_regmap(syscon);
+ if (!r) {
+ dev_dbg(dev, "unable to find regmap\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ return r;
+}
+
+int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
+{
+ int ret;
+
+ *devp = NULL;
+
+ ret = uclass_first_device_drvdata(UCLASS_SYSCON, driver_data, devp);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
+{
+ struct syscon_uc_info *priv;
+ struct udevice *dev;
+ int ret;
+
+ ret = syscon_get_by_driver_data(driver_data, &dev);
+ if (ret)
+ return ERR_PTR(ret);
+ priv = dev_get_uclass_priv(dev);
+
+ return priv->regmap;
+}
+
+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 = sizeof(struct syscon_uc_info),
+ .pre_probe = syscon_pre_probe,
+};
+
+static const struct udevice_id generic_syscon_ids[] = {
+ { .compatible = "syscon" },
+ { }
+};
+
+U_BOOT_DRIVER(generic_syscon) = {
+ .name = "syscon",
+ .id = UCLASS_SYSCON,
+#if !CONFIG_IS_ENABLED(OF_PLATDATA)
+ .bind = dm_scan_fdt_dev,
+#endif
+ .of_match = generic_syscon_ids,
+};
+
+/*
+ * Linux-compatible syscon-to-regmap
+ * The syscon node can be bound to another driver, but still works
+ * as a syscon provider.
+ */
+struct regmap *syscon_node_to_regmap(ofnode node)
+{
+ struct udevice *dev;
+ struct regmap *r;
+
+ if (uclass_get_device_by_ofnode(UCLASS_SYSCON, node, &dev))
+ if (syscon_probe_by_ofnode(node, &dev))
+ return ERR_PTR(-ENODEV);
+
+ r = syscon_get_regmap(dev);
+ if (!r) {
+ dev_dbg(dev, "unable to find regmap\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ return r;
+}